US20130333689A1

US20130333689A1 - Dual axis synchronized tracking system

Info

Publication number: US20130333689A1
Application number: US13/526,559
Authority: US
Inventors: Bruce Sho Umemoto
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-06-19
Filing date: 2012-06-19
Publication date: 2013-12-19

Abstract

There is disclosed a dual axis tracking system (200) comprising a support structure (300) for supporting at least one solar device (1); a movable carriage frame (353) pivotally coupled to the support structure (300); at least one carrier arm (351) pivotally coupled to the support structure (300) and to the movable carriage frame (353). Each carrier arm (351) is adapted to hold or support a plurality of carrier arms (351) and other solar devices such as reflecting means or the likes. A motion assembly (352) pivotally coupled to the carriage frame (353) for providing movements to the carriage frame (353) and the carrier arm (351); wherein the motion assembly (352) comprises at least one telescopic member (352 a) and a track assembly (352 b). The orientations or movements of the solar devices (1) are generally in response to the motions provided by the motion assembly (352) in cooperation with the carriage frame (353) and the carrier arm (351).

Description

FIELD OF INVENTION

Embodiments of the claimed invention relate to tracking in general, and more particularly trackers and systems for tracking the sun and/or other astronomical objects based on two general axes of rotation.

BACKGROUND

In the emerging industry of solar power, dual axis sun tracking has been the favored approach over single axis tracking owing to its known reputation as a more effective additional facility to provide accurate positioning thus significantly improving solar panel overall output. Primarily formed with means for tracking the motion of the sun, dual axis trackers are often used to provide tracking movements for a plurality of linked solar panels, such linking thereby necessitates the plurality of panels to be mounted on considerably large and complex frame or fixtures. These frames are typically sustained by a single vertical support post and equipped with numerous components to provide dual axis movements in addition to ensuring the panels move in alignment based on two axes. In many occasions, an insubstantial structure would face instability complications particularly due to weight imbalance and wind load effects on solar panels.
However, the overall handling of dual axis trackers and systems and its installation are often associated with complexity and being prohibitively expensive due to the considerably large number of operational components compared to that of single axis trackers. Perceptibly, increased complexity and number of components introduces additional possibilities for malfunctions and overall failures. Another major barrier for installation of solar tracking systems is portability and construction, whereby for highly complex systems having a large number of moving parts, portability and construction would be correspondingly difficult and in some cases, would involve relatively high cost.
In an effort to alleviate or partially address the current drawbacks of dual axis sun trackers and systems, the idea of central actuating structures or members adapted to provide synchronized movements for a plurality of solar panels have been introduced in the market, although a great majority of these structures suffers from one or more flaws such as complexity in installation, ineffective wind loading features, weight imbalances which could gradually affect the tracking accuracy and thus become uneconomical.
One of the helpful attempts to resolve issues linked to weigh imbalance in sustaining large amount of solar arrays; is as disclosed in U.S. Pat. No. 4,968,355 (Johnson), whereby this patent teaches a counterbalanced solar tracking system including a plurality of truss structures, polar driving means and a plurality of wheel segments to move arrays of panels. From here it is apparent that although the disclosed structure may be expedient for providing a counterbalanced sun tracking system there appears to be a large number of moving components involved in order to achieve the desired results. Therefore, installation for this system can be a complicated task.
In another disclosure, United States Application Number 2011/0041834 (Liao, Henry H) teaches a dual axis solar tracker system and apparatus which comprises dual linear actuators mounted adjacent to a ground post which is a vertical post, a rotatable or rotating head being connected to the top end of the ground post for providing or actuating dual axis movements of two panels mounted to a horizontal beam. The rotating head is essential to permit rotation of the panels. Based on the moving parts disclosed, this tracker system can be regarded as cost effective, however the number of solar panel that can be mounted to each horizontal beam is limited, otherwise the stability of the tracker system may be compromised. Therefore, this tracker may not be effectively fit for supporting a large array of solar panels or providing synchronized movements for a large number of solar panels.
In another exemplary of the prior art, European Patent Number 1998122 A1 has suggested a rotating head or an additional device that enables the rotation or at least causes rotation of the supported PV module. It can be seen from this particular disclosure that the rotation of module is heavily dependent on a spherical tower affixed to a base structure. The tower is adapted to be able to tilt and track the sun. The weight of the photovoltaic module is entirely supported by a spherical tower adapted to provide movements to said module in tracking the sun. From here it can be recognized that the structure, more particularly the tower may succumb to failure after a period of time owing to the mechanical stress and strain from the large number of panels to be supported on a single point.
Accordingly, there remains a considerable need for solar trackers systems and methods that can expediently resolve the drawbacks associated to providing a counterbalanced and stable dual axis solar tracking structure to provide synchronized movements for a plurality of solar panels with minimum number of moving components thus substantially reducing the overall cost and time required for installation.

SUMMARY OF INVENTION

Various objects, features, aspects, and advantages of the present invention will become more apparent from the following detailed description of preferred embodiments of the invention, along with the accompanying drawings in which like numerals represent like components or members.
In one aspect of the claimed invention, there is disclosed a dual axis solar tracking system (200) comprising: a support structure (300) for supporting at least one solar device (1) comprising at least two horizontal members (301,302), at least one transverse post (308) secured at a central region of the support structure (300) and a movable carriage frame (353) pivotally coupled to the horizontal members (301, 302);
In a further aspect of the claimed invention, there is at least one carrier arm (351) pivotally coupled to at least one of the horizontal members (301, 302) and to the movable carriage frame (353); said carrier arm (351) for holding at least one solar device (1); a motion assembly (352) pivotally coupled to the carriage frame (353) for providing movements to the carriage frame (353) and the carrier arm (351).
In another aspect of the claimed invention, the motion assembly (352) comprises at least one telescopic member (352 a) and a track assembly (352 b); said track assembly (352 b) comprising at least one sliding member (40) being slidably connected to a sliding track (41).
In a further aspect of the claimed invention, the telescopic member (352 a) is pivotally and slidably coupled to the motion assembly (352) and in a manner such that a lower section of the telescopic member (352 a) is slidable on the sliding member (40); and that the lower section of the telescopic member (352 a) is movable laterally or forward and backward.
It is another aspect of the claimed invention at which the solar device (1) varying orientations or movements are in response to the motions provided by the motion assembly (352) in cooperation with the carriage frame (353) and the carrier arm (351).
These and further objects and advantages will be apparent to those skilled in the art in connection with the drawings and then detailed description of the embodiments set forth below.

BRIEF DESCRIPTION OF THE DRAWINGS

Features of the claimed invention will be apparent from the following description when read with reference to the accompanying drawings:

FIG. 1( a) illustrates the overall view of the solar tracking system in accordance with the preferred embodiments of the claimed invention;

FIG. 1( b) illustrates a perspective view of the support structure (300) for the system (200) in accordance with a preferred embodiment of the claimed invention;

FIG. 2 illustrates the overall view of the carriage assembly according to the preferred embodiments of the claimed invention;

FIG. 3( a) shows a perspective and elevated view of the motion assembly in accordance with the preferred embodiments of the claimed invention;

FIG. 3( b) shows another perspective and elevated view of the motion assembly in accordance with the preferred embodiments of the claimed invention;

FIG. 3( c) shows a view of a mounting member in accordance with the preferred embodiments of claimed invention;

FIG. 4 shows an elevated view of the track assembly in accordance with the preferred embodiments of the claimed invention;

FIG. 5( a) illustrates the carrier arm without the solar device in accordance with the preferred embodiments of the claimed invention;

FIG. 5( b) illustrates the carrier arm having two solar panels and reflective means mounted thereon in accordance with the preferred embodiments of the claimed invention;

FIG. 5( c) illustrates a connector for providing pivotal connection of the carrier arm to the horizontal post in accordance with the preferred embodiments of the claimed invention;

FIG. 6( a)-FIG. 6( c) shows an exemplary of tracking information for countries included in the Southern and Northern hemisphere; and

FIG. 7 shows an exemplary of the reflecting angles for a standard reflecting means.

DETAILED DESCRIPTION

In the following description, reference is made to the accompanying drawings where, by way of illustration, specific embodiments of the invention are shown. It is to be understood that other embodiments may be used as structural and other changes may be made without departing from the scope of the claimed invention. Also, the various embodiments and aspects from each of the various embodiments may be used in any suitable combinations. Accordingly, the drawings and detailed description are to be regarded as illustrative in nature and not as restrictive.
Embodiments of the claimed invention are directed to a solar tracker having the object of solving the previously discussed drawbacks in a cost effective manner.
Relative terms such as “upper”, “lower”, “below”, “above” and the likes may be used for ease of description in elucidating the subject matter of the present invention, particularly for describing an element or member's relationship to another member or element.
To that end the tracking system in accordance with the preferred embodiments of the claimed invention provides orientations in tracking the sun for an array of solar-based devices; based on two different axes. It is contemplated that the tracking system can be used for tracking other astronomical objects of the solar system. Examples of solar devices include solar panels and additional solar reflector/concentrator members; whereby these devices are linked within the system in a manner such that the synchronized movements can be provided with minimum number of moving components.
FIG. 1( a) generally illustrate dual axis tracking system (200) for supporting and moving a plurality of solar devices (1,2), module or an array of solar based devices in tracking the sun in one embodiment, comprising a plurality of solar devices (1,2); support structure (300), at least one carrier arm (351) (inserted in amended drawings), a carriage assembly for holding and providing movement of solar devices (1, 2) and a motion transfer or motion assembly (352).
Support Structure
FIG. 1( b) shows a perspective view of the support structure (300) for the system (200) in accordance with a preferred embodiment of the claimed invention.
Now referring to FIG. 1( b), the support structure (300) includes two horizontal elongated support members or posts (301, 302) which serves generally to hold the carriage assembly and providing pivotal movements support, whereby each end of the horizontal support members (301, 302) is connected to a vertical member (303, 304, 305, 306) thus holding up the horizontal members as seen in FIG. 1( b). It is contemplated that the main body of the vertical and horizontal members may be of various cross sections, whichever deemed suitable for supporting a plurality of solar devices (1,2).
As shown in FIG. 1( b), the vertical (303, 304, 305, 306) and horizontal members (301, 302) are generally elongated in structure. They can be in the form of tubes, poles or posts, which can be of various dimensions, deemed suitable to support and permit solar panels movement. It should be appreciated that the vertical (303, 304, 305,306) and horizontal members (301, 302) can be constructed from materials such as, but not limiting to, alloy, steel based materials or reasonable combinations thereof, coated or non-coated.
In one aspect of the claimed invention, the horizontal members (301, 302) are in the form of square hollow posts. As briefly discussed in the preceding paragraph, each end of the horizontal members (301, 302) is rotatably connected to at least two mutually opposing vertical support posts (303, 304, 305,306). The vertical posts (303, 304, 305,306) may be constructed from suitable materials with sufficient strength to support the overall structure including the plurality of solar devices (1,2).
Accordingly in order to achieve a rotatable connection or attachment with the horizontal members (301, 302), the vertical posts (303, 304, 305, 306) may include a cross tube thus forming a T-shaped post as shown FIG. 1( b). In such T-shaped structure, the cross tube or crosspiece is formed by a hollow tube positioned on top end of the main body of said vertical post (303, 304, 305, 306). The main body being circular cross section and the bottom end is formed with a base member (16) so as to provide ground stability and as rigid foundation of the overall tracker system. The cross hollow tube (11, 12,13,14) of each vertical post has a dimension sufficient to receive one end of the horizontal member (301) and at the same time allowing it to rotate with the aid of suitable bushing means provided on each end. The same arrangement can be provided for the other horizontal members (301, 302) of the support structure (300).
As seen in FIG. 1( b) and in accordance with the preferred embodiments of the claimed invention, the support structure (300) further comprises a transverse post (308) located generally at the middle region of the structure (300), so as to provide added rigidity to the overall structure. Therefore in this position, each end of the transverse post (308) is secured to the respective horizontal member (301, 302), in which said ends of the transverse post (308) may be secured to the horizontal members (301, 302) by way of a connecting piece (308 a, 308 b) which is in the form of a tubular connecting piece provided with suitable bushing means, similar to that of the vertical posts (303, 304, 305,306). At approximately the central region, along the length of the transverse post (308) there provided a connector, which in a way connects at least one section of the carriage assembly to the support structure (300). It is contemplated that the connecting end (308 a, 308 b) may be provided detachably or permanently structured with the transverse post (308).
The purpose of the transverse post (308) will be described herein below in conjunction with the carriage assembly.
The support structure (300) further comprises a plurality of concrete blocks (80, 81, 82, 83) or anchoring means of the likes to serve as foundations for the tracking system (200).
Carriage Assembly
FIG. 2 illustrates the overall view of the carriage assembly according to the preferred embodiments of the claimed invention. The carriage assembly in accordance with the preferred embodiments of the claimed invention comprises a plurality of horizontal posts (17, 18, 19, 20) forming a carriage frame (353).
In this embodiment, the carriage frame (353) generally comprises of at least four horizontal posts interlocked together in a manner such that they form a H-shaped frame. For this configuration, two of the said posts being spaced apart at a predetermined distance, referred herein as the middle posts (19,20) are perpendicularly connected in between two other posts (17, 18), which are referred herein as lateral posts. At least two horizontal posts of the carriage frame (353), particularly the lateral posts (17, 18), are in parallel position with that of the horizontal posts (301, 302) of the support structure when assembled, and are pivotally connected to at least one carrier arm (351) (overall illustration of carrier arm is shown in FIG. 5), thus making the carriage frame (353) downwardly suspended from the support structure (300) and is movable. For this connection, each end of the horizontal posts (301, 302) is pivotally connected to one end of the carrier arm (351). There may be further included additional poles or tubes suitably disposed within the frame (353) to strengthen the carriage frame (353) thus providing further rigidity to the said frame (353).
Motion Assembly
FIG. 3( a) shows a perspective and elevated view of the motion assembly (352) in accordance with the preferred embodiments of the claimed invention.
Now referring to FIG. 3( a), the motion assembly (352) in accordance with the preferred embodiments of the claimed invention is pivotally connected to the carriage frame (353) and at the same time, at least one member of the motion assembly (352) is adapted to be movable upwards or downwards relative to said carriage frame (353). The motion assembly (352) is positioned vertically upwards relative to the carriage frame (353). The motion assembly (352) in this embodiment comprises a telescopic member (352 a), a track assembly (352 b) and a first and second motor units (352 c, 352 d) (overall illustration of track assembly and motor units are shown in FIG. 4). As seen in FIG. 3( a), a first end of the telescopic member (352 a) is pivotally secured to the transverse post (308) and a second end is pivotally and slidably secured to the track assembly (352 b). The middle section of the telescopic member (352 a) is pivotally connected to the carriage frame (353). As suitably shown in FIG. 3( a) and FIG. 3( b), all of these sections of the telescopic member (352 a) are connected to their respective support structures as mentioned above by way of at least one concentric rings connector (70 a, 70 b, 71 a, 71 b, 72 a, 72 b) and mounting member (25) to be described herein.
Now referring to FIG. 3( b), the concentric rings connector (70 a) comprises two ring-shape members, whereby at least one is adapted to be connected movably within the other and thus sharing the same axial point. Understandably, at least one ring member, the inner ring (70 a), has a smaller diameter, than that of the outer ring (70 b). There is further included a mounting member (25) which is adapted to be secured on the telescopic member (352 a) and within the open space of the inner ring (70 a). On the external surface of the inner ring (70 a) there is formed a first pair of horizontal extensions (30, 31) (shown in FIG. 3( a)) suitably disposed at mutually opposing positions. These extensions (30,31) serve to provide pivotal securement of the inner ring (70 a) within the outer ring (70 b) as seen in FIG. 3( a). It would be apparent that these extensions can be formed on the inner surface of the outer ring (70 b), or at other positions suitable to provide a pivotal effect.
Still referring to FIG. 3( a) and FIG. 3( b), there is further provided a second pair (32, 33) of extensions extending horizontally from the inner surface of the inner ring (70 a) at mutually opposing positions. Each of the second pair of protrusions (32, 33) comprises a rod attached with a bracket (30 a, 31 a) at one end. The bracket (32, 33) is adapted to receive a section of the disc shape member of the connecting member (25) to the described in detail herein below. In one embodiment, the outer ring (70 b) is integrally formed or formed on the transverse post (308).
Accordingly, the first concentric rings connector (70 a, 70 b) is positioned at the top portion of the telescopic unit (352 a), whereby for this portion, the outer ring (70 b) is secured or may be formed with the transverse post (308). The second set of concentric rings (71 a, 71 b) is positioned approximately at the middle portion or section of the telescopic member (352 a) whereby the telescopic member (352 a) slides through the inner ring (71 a) of the second concentric ring (71 a, 71 b) and terminates at the first concentric ring (70 a, 70 b). In this arrangement, the outer ring (71 b) is secured to the middle region of the carriage frame (353). The third concentric rings set (72 a, 72 b) is positioned at the lower portion of the telescopic unit (352 a), and connected to the track assembly (352 b). It should be noted that in this embodiment, in order to allow the telescopic member (352 a) to be extensible or compressible, as to perform a telescopic effect, the inner ring (71 b) of the second concentric rings (71 a, 71 b) is not secured or mounted to the telescopic member (352 a). The inner rings (70 a, 72 a) of the first and third concentric rings (70 a, 70 b, 72 a, 72 b) however are mounted to the respective sections of the telescopic member (352 a).
FIG. 3( c) shows the mounting or connecting member (25) of the motion assembly (352) in accordance with the preferred embodiments of the claimed invention. The mounting member (25) is generally a flange type connector, which includes a tubular body having a pair of peripheral disc shape members (25 a, 25 b) (note: no 25 a or 25 b (shown in FIG. 3( c)). It is further formed with peripheral external ridge and a corresponding central opening on both disc members (25 a, 25 b) sized sufficiently to receive a cylindrical member such as a tube or post. In this embodiment, the disc members (25 a, 25 b) are accordingly sized to receive the telescopic member (352 a).
Track Assembly/Unit
FIG. 4 shows an elevated view of the track assembly (352 b) in accordance with the preferred embodiments of the claimed invention. The track assembly (352 b) of the claimed invention provides dual axis movements, and more particularly dual axis tracking movements for the tracker system (200). Further in accordance with the preferred embodiments of the claimed invention, the track assembly (352 b) (cannot (shown in revised drawings) is generally disposed below the carriage frame (353) of the support structure (300).
With reference to FIG. 4, the track assembly (352 b) includes a sliding member (40) being slidably connected to a sliding track (41). The sliding track (41), for the sliding member (40) in accordance with the preferred embodiments of the claimed invention is formed by a plurality of horizontal posts (41 a, 41 b) defining a rail like structure; having predetermined sizes being secured together in a suitable manner so as to receive and allow the sliding member (40) to move slidably along its length when assembled. In one embodiment, the two horizontal posts (41 a, 41 b) are arranged superposed at certain equidistance from one another as suitably shown in FIG. 4. Each of the sliding tracks (41) is disposed on each end of the sliding member (40) and below the carriage frame (353). The track assembly (352 b) may further include a plurality of concrete members (42,43,44, 45, 46, 47, 48, 49) (shown in FIG. 2) so as to lock down or secure the track assembly (352 b) to the ground or any rigid surface.
The sliding member (40) comprises two elongated members (40 a, 40 b) being horizontally positioned and held in position by an inverted U shaped structure or member (40 c) whereby each end of said elongated members is provided with at least one roller means (52,53,54,55) so as to enable these elongated members to be slidably connected to the sliding tracks (41) as shown in FIG. 4. Suitably, the movement of the sliding member (40) along the sliding tracks (41) results to sun-tracking movements or orientations for the solar panels upon assembled.
Still referring to FIG. 4, a first motor unit (352 c) is secured to one section of the inverted U-shaped member (40 c) in a manner such that the motor unit (352 d) is able to provide forward and backward motion for the sliding member (40). The first motor unit (352 c) can be in the form of a conventional geared motor provided with a telescopic shaft (40 d).
As mentioned earlier, the third concentric rings connector (72 a, 72 b) is secured to the sliding member (40) in a manner such that it is slidable along the length of the sliding member (40). In this connection, the third concentric rings connector (72 a, 72 b) at which the outer ring (72 b) in this preferred embodiment is formed with two mutually opposing T-shape connectors (38, 39); which serves mainly to provide slidable attachment to the sliding member (40). In this position, the third concentric rings connector (72 a, 72 b) therefore serves as a movable base for the motion assembly (352). The connector (72 a, 72 b) therefore moves perpendicular to that of the sliding member (40) movement.
The second motor unit (352 d) comprises a conventional geared motor connected to a shaft, said shaft having a moveable piece is disposed on the U-shaped member (40 c) of the sliding member (40) in manner such that it is able to provide forward and backward motion for the third concentric rings connector (72 a, 72 b).
Proceeding from the above, the sliding member (40) in accordance with the preferred embodiments of the claimed invention comprises two horizontal posts (40 a, 40 b) having equal or uniform dimension. The third concentric rings connector (72 a, 72 b) is disposed perpendicularly in between said two posts (40 a, 40 b) thus keeping these posts apart at a predetermined distance. The third concentric rings connector (72 a, 72 b) is connected in a manner such that it can slide effortlessly on said horizontal posts (40 a, 40 b) of the sliding member (40) with the aid of the second motor unit (352 d). As discussed earlier, on each end of the horizontal posts (40 a, 40 b) of the sliding member (40) there is provided at least one roller or slide elements so as to allow the linear motion of the sliding member (40) along the sliding track (41). The depicted means or methods of attaching the roller(s) to the respective horizontal posts as shown in the drawings are by way of example and one of skill in the art will appreciate that other methods are available and are included within the scope of the invention.
Carrier Arm/Solar Device Holder
FIG. 5( a) illustrates the carrier arm (351) without the solar device (1) in accordance with the preferred embodiments of the claimed invention. The carrier arm (351) may be constructed from alloy based material, or suitably rigid material capable of holding at least a pair of solar devices (1,2). It can be coated or non-coated. The carrier arm (351) comprises two sections, the first section being the upper end or section of the arm (351 a) is adapted to carry the desired solar devices, for instance, at least a pair of solar panels (1) or solar module (1), and another end (351 b), which is the lower end or lower section, is pivotally coupled to the carriage frame (353). The carrier arm (351) generally resembles a T-shape structure thus comprising a cross bar being the upper section and a vertical bar being the lower section.
The upper section (351 a) of the carrier arm (351) being the solar panel holder may include, for example, at least one panel frame for one solar panel or a pair of holder bars (351 c, 351 d) disposed a right angle with respect to the top section of the carrier arm (351). Each bar is secured at a predetermined distance from each other on the top section of the carrier arm (351 a) as suitably shown in FIG. 5( a). Further, on each end of the holder bar (351 c, 351 d) there may be secured at least one additional bar for holding reflecting means (2) or members of the likes. Both top or upper and lower sections (351 a, 351 b) of the carrier arm (351) are generally elongated in structure and can be in the form of square tubes. As seen in FIG. 5( b), there can be three solar devices mounted to the carrier arm (351).
Now referring to FIG. 5( c), the carrier arm (351) is attached to the horizontal member (301, 302) of the support structure (300) by means of a rotation connector (92). The rotation connector (92) permits the upper section (351 a) of the carrier arm (351) to be rotated relative to the horizontal member (301, 302). The rotation connector (92) may be constructed from alloy based or plastic materials formed into two main sections, a first section being a tubular hollow member and the second section is generally an inverted U-shaped body defining a bracket for securement of the upper end (351 a) of the carrier arm (351) to the respective horizontal member (301, 302).
In an alternative embodiment, at least two solar panels (1) and at least one reflecting means or a concentrator means (2) can be secured to the carrier arm (351) to increase or optimize solar radiation towards the panels (1). It is contemplated that the attachment of solar panels or modules on the carrier arm (351) may include standard mountings, which are known in the art.
Still referring to FIG. 5( a) and FIG. 5( b), the carrier arm (351) according to the embodiments of the claimed invention can rotate or swing freely in response to the force provided by the motion assembly (352), with the aid of the carriage frame (353). This is achieved by connecting the lower end of the carrier arm (351) to the lateral post (17, 18). Such attachment can be provided by a pair of flat projections (90,91) which extend downwardly or the likes with predetermined dimension. Each projection (90, 91) is formed with a mounting hole (65) sized to fit suitable fastening means such as rivets or bolts. The projections (90, 91) may be provided at the bottom end of the carrier arm (351) so as to connect the carrier arm (351) the lateral posts (17, 18) of the carriage frame (353).
A rod-like fastening means or simply a bolt can be extended through the mounting hole (65) formed on each projection (90,91), into the corresponding mounting hole on the lateral post (17, 18) thus safely securing the lower section (351 b) of the carrier arm (351) thereto.
Operational Assemblage
In accordance with the preferred embodiments of the claimed invention, when assembled, there can be a plurality of solar devices such as solar panels (1) mounted on each carrier arm (351). The carriage frame (353) is connected to the carrier arm (351) by way of the lateral posts (17, 18), in which there can be, for example two carrier arms (351) secured to each lateral post (17,18) of the carriage frame (353). Accordingly, there can be eight solar panels (1), each of which having two reflecting means secured adjacent to it, thus a total of 24 solar devices can be secured one carriage frame (353). The motion assembly (352) is disposed proximate to the central region of the carriage frame (353) whereby the telescopic member (352 a) is pivotally connected within the overall structure of the solar tracker (200). The transverse post (308) is horizontally connected at the central region of the solar tracker (200).
Dual Axis Sun-Tracking
In accordance with the preferred embodiments of the claimed invention, the sun-tracking motion of the subject solar tracker (200) is based on dual axis tracking, whereby the motion assembly moves the solar devices uniformly about the respective pivotal axes, depending on the motion of the attached motor units, which in turn depends on the position of the sun or celestial object.
The first motion of the solar tracker (200) is the movement of the carrier arm (351) carrying the solar device (s) in this context being solar panels (1) and reflecting means; is based on a vertical axis or day motion of the sun, thus moving based on the east to the west plane, and vice versa. The first motion of the solar tracker (200) aims to keep the panels perpendicular to the position of the sun. The second motion provided by the solar tracker (200) is basically in contrast to that of the vertical axis, whereby the second motion is based on a horizontal axis or lateral motion for tracking the seasonal positions of the sun.
The first motion therefore is accomplished based on the movement of the sliding member (40) along the length of the posts of the sliding track (41). The second motion is accomplished based on the movement of the lower section of the telescopic member (352 a) along the sliding member (40). Generally, the telescopic member (352) plays a major role in a manner such that the lower section can be moved laterally and forward and backward owing to the slidable and pivotal attachment to the sliding member (40); which is being moved by the first and second motor units (352 c, 352 d).
Understandably, the solar tracking overall operation is dependent on the positions of the sun, which is by and large, based on geographical locations. Tracking parameters may include current time, date and seasonal changes. As an example, the tracking information for countries included in the Southern and Northern hemisphere is shown in FIG. 6( a) to FIG. 6( c). In this instance, the angle of inclination of the solar panel (1) changes every one-hour, and more preferably 15 degrees every one hour. In one example, the initial position of the solar panel (1) may be 45 degrees relative from a horizontal base. After one hour, the tilt angle may decrease to 30 degrees and so forth. By noon, the solar panel (1) may be at a right angle relative to the vertical post of the carrier arm (351). It is contemplated that the tilting angles may vary subject to season changes and operation parameters.
From the above disclosure it is seen that the dual axis tracking system of the claimed invention is of simple construction with minimal moving parts, but capable of providing synchronized orientations to possibly an unlimited number of solar panels or solar array in tracking the sun. Perceptibly, with minimal components, the overall costing can be significantly reduced than that of existing dual axis trackers, hence potential cost savings. Further, the claimed invention potentially addresses land constraint issues as the structure of the tracker as disclosed herein can support and control or maneuver arrays of panels with minimal amount of components.
It is further contemplated, and as briefly disclosed in earlier paragraphs, the dual axis tracking system can be used for tracking other astronomical or celestial objects, whereby for such purpose, the astronomical tools can be mounted on the carrier arms (351) in a manner such that the tools or devices can move in alignment or synchronously during tracking
Another apparent advantage is using the tracking system as disclosed herein in applications when reflectors and concentrators are used. Sunlight can be efficiently reflected towards the panels based on more varied or flexible angles considering the dual axis movements compared to that of a single axis movements. Examples of the reflection angles for each mirror or sunray reflective means can be seen in FIG. 7.
Thus, specific arrangements and combinations of a dual axis tracker have been disclosed. It should be apparent, however, to those skilled in the art that many more modifications besides those already described are possible without departing from the inventive concepts herein. The inventive subject matter, therefore, is not to be restricted except in the spirit of the disclosure. Moreover, in interpreting the disclosure, all terms should be interpreted in the broadest possible manner consistent with the context. In particular, the terms “comprises” and “comprising” should be interpreted as referring to elements, components, or steps in a non-exclusive manner, indicating that the referenced elements, components, or steps may be present, or utilized, or combined with other elements, components, or steps that are not expressly referenced.

Claims

What is claimed is:

1. A dual axis tracking system (200) comprising:

a support structure (300) for supporting at least one solar device (1) comprising at least two horizontal members (301,302), at least one transverse post (308) secured at a central region of the support structure (300) and a movable carriage frame (353) pivotally coupled to the horizontal members (301, 302);

at least one carrier (351) pivotally coupled to at least one of the horizontal members (301, 302) and to the movable carriage frame (353); said carrier arm (351) for holding at least one solar device (1);

a motion assembly (352) pivotally coupled to the carriage frame (353) for providing movements to the carriage frame (353) and the carrier arm (351);

wherein the motion assembly (352) comprises at least one telescopic member (352 a) and a track assembly (352 b); said track assembly (352 b) comprising at least one sliding member (40) being slidably connected to a sliding track (41);

wherein the telescopic member (352 a) is pivotally and slidably coupled to the motion assembly (352) and in a manner such that a lower section of the telescopic member (352 a) is slidable on the sliding member (40); and that the lower section of the telescopic member (352 a) is movable laterally or forward and backward;

wherein the solar device (1) varying orientations or movements are in response to the motions provided by the motion assembly (352) in cooperation with the carriage frame (353) and the carrier arm (351).

2. The solar tracking system (200) as claimed in claim 1, wherein the movable carriage frame (353) is pivotally coupled to the horizontal posts (301, 302) in such a way that it is downwardly suspended from said horizontal posts (301, 302).

3. The solar tracking system (200) as claimed in claim 1, wherein the carrier arm (351) comprises an upper section (351 a) for holding the solar device (1) and a lower section (351 b) that extends downwardly and is pivotally connected to at least one section of the carriage frame (353).

4. The solar tracking system (200) as claimed in claim 1 wherein the carriage frame (353) comprises at least two horizontally positioned lateral posts (17, 18) and two middle posts (19, 20).

5. The solar tracking system (200) as claimed in claim 4, wherein each carrier arm (351) is pivotally coupled to the lateral posts (17, 18) of the carriage frame (353).

6. The solar tracking system (200) as claimed in claim 1, wherein the telescopic member (352 a) is pivotally coupled to the transverse post (308), carriage frame (353) and sliding member (40) by way of concentric rings connectors (70 a, 70 b, 71 a, 71 b, 72 a, 72 b), in a manner such that the telescopic member (352 a) is able to be compressible and also move in accordance with the motion provided by the carriage frame (353) and the sliding member (40).

7. The solar tracking system (200) as claimed in claim 6 wherein the telescopic member (352 a) slides through into the second concentric ring connector (71 a, 71 b) and terminates at the first concentric ring connector (70 a, 70 b).

8. The solar tracking system (200) as claimed in claim 6, wherein an upper section of the telescopic member (352 a) is pivotally coupled to the transverse post (308), a middle section is pivotally coupled to the carriage frame (353) and the lower section is pivotally and slidably coupled to the sliding member (40).

9. The solar tracking system (200) as claimed in claim 1, wherein the support structure (300) further comprising a plurality of vertical posts to hold up the horizontal posts (301, 302).

10. The solar tracking system (200) as claimed in claim 1 wherein the sliding member (40) comprises two elongated members (40 a, 40 b) being horizontally positioned and held in position by an inverted U shaped structure or member (40 c) whereby each end of said elongated members is provided with at least one roller means (52,53,54,55) so as to enable these elongated members to be slidably connected to the sliding track (41).

11. The solar tracking system (200) as claimed in claim 6 wherein the concentric rings connector (70 a, 70 b, 71 a, 71 b, 72 a, 72 b) comprises two ring-shape members, whereby at least one is adapted to be an inner ring (70 a, 71 a, 72 a) and another is adapted to be the outer ring (70 b, 71 b, 72 b); whereby said inner ring is movably connected within the outer ring and thus both rings share the same axial point.

12. The solar tracking system (200) as claimed in claim 6 wherein telescopic member (352 a) is further connected by a mounting member (25); said mounting member (25) comprising a pair of disc shape members (25 a, 25 b) formed with peripheral external ridge and a corresponding central opening on both disc members (25 a, 25 b) sized sufficiently to receive the telescopic member (352 a).

13. The solar tracking system (200) as claimed in claim 12 wherein at least one mounting member (25) is pivotally disposed on the telescopic member (352 a) within the inner ring of the concentric rings connector (70 a, 70 b, 71 a, 71 b, 72 a, 72 b).

14. The solar tracking system (200) as claimed in claims 1 to 3 wherein the upper section of the carrier arm (351 a) is pivotally connected to the horizontal post (301, 302) by a connector (92); said connector (92) comprises two main sections, a first section being a tubular hollow member and the second section is generally an inverted U-shaped body defining a bracket for securement of the upper section (351 a) of the carrier arm (351) to the respective horizontal member (301, 302).

15. The solar tracking system (200) as claimed in claim 1 wherein the motion assembly (352) further comprising two motor units (352 c, 352 d); wherein one motor unit (352 c) is connected to provide movement for the sliding member (40) and another motor unit (352 d) is adapted to provide sliding movement for the lower section of the telescopic member (352 a) on the sliding member (40).

16. The solar tracking system (200) as claimed in claim 1 wherein there is provided a plurality of carrier arms (351) mounted to the horizontal posts (301, 302) and each carrier arm (351) carries a plurality of solar devices (1, 2).

17. The solar tracking system (200) as claimed in claim 1 wherein a first motion for the solar device (1) is accomplished based on the forward and backward movement of the sliding member (40) along the length of the posts of the sliding track (41) and a second motion is accomplished based on the movement of the lower section of the telescopic member (352 a) along the sliding member (40).

18. A dual axis solar tracking system (200) comprising:

a support structure (300) for supporting a plurality of solar devices (1) comprising at least two horizontal members (301,302), at least one transverse post (305) secured horizontally at a central region of the support structure (300) and a movable carriage frame (353);

a plurality of carrier arms (351) pivotally coupled to at least one of the horizontal members (301, 302) and to the movable carriage frame (353); said carrier arm (351) for holding at least two solar devices (1);