WO1997044885A1 - Electrical control system for a sewing-machine drive - Google Patents
Electrical control system for a sewing-machine driveInfo
- Publication number
- WO1997044885A1 WO1997044885A1 PCT/EP1997/001388 EP9701388W WO9744885A1 WO 1997044885 A1 WO1997044885 A1 WO 1997044885A1 EP 9701388 W EP9701388 W EP 9701388W WO 9744885 A1 WO9744885 A1 WO 9744885A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- control
- microprocessor
- intermediate circuit
- control elements
- Prior art date
Links
Classifications
-
- D—TEXTILES; PAPER
- D05—SEWING; EMBROIDERING; TUFTING
- D05B—SEWING
- D05B69/00—Driving-gear; Control devices
- D05B69/14—Devices for changing speed or for reversing direction of rotation
- D05B69/18—Devices for changing speed or for reversing direction of rotation electric, e.g. foot pedals
Definitions
- the invention relates to an electrical control for a sewing drive according to the preamble of the main claim.
- sewing machines are relatively simple machines, part of the electronic control controls the operating elements such as thread trimmer, presser foot, etc., while the other part controls the main drive in the form of a motor.
- This is used in the sewing industry as an asynchronous motor with an electromechanical clutch / brake system, DC motors and servo motors. These drives can run at predetermined speeds and position them at predefinable angles.
- the clutch / brake system is preferably supplied with a low voltage of less than 50 V, mostly 24 V DC. Clutch coils or brake coils are driven in a clocked manner from this voltage source. This sets the desired speed of the drive.
- the servomotors (DC motor or brushless DC motor) are supplied in this Performance class directly from the network.
- the mains voltage is rectified and buffered with a sufficiently large capacity.
- the voltage across the capacitor forms the so-called intermediate circuit voltage, which then operates the motor via the electronic assemblies and components. Since the motor is operated directly at the mains potential, the regulations and guidelines for mains operation are used for this part of the control.
- control elements are usually only controlled with a low voltage of ⁇ 50 V. The reason is that not all control units and other equipment can be designed for network potential and the protection of the operator from an electric shock must be guaranteed.
- the control contains a part with mains potential for controlling the main drive, the parts with extra-low voltage potential must be safely separated from the mains potential in the control itself (safety isolation). This means that in addition to compliance with minimum distances between the lines of the voltage circuits, a potential separation for certain input and output signals must either take place via optocouplers or transformers between the two voltage circuits.
- the use of several voltage circuits means that several voltage sources are also required for this.
- a 24 V voltage source for a short-term (several hundred ms) current of 10 A is used to supply the control elements.
- the electronic circuits require a power supply unit with 5 V and approx. 1 A and the electronic components for controlling the main drive on the mains voltage side require one Another power supply unit with a voltage between 5 and 15 V and a current of 1 A.
- the control elements are generally voltage-controlled. In order to ensure that these elements function properly, the voltage must be relatively constant. Therefore, the intermediate voltage cannot be used directly to supply the control elements.
- the DC link voltage depends on the one hand on the level of the mains voltage and on the other hand on the operating state of the motor.
- the invention is based, an electronic control according to the preamble of the task
- all voltages can be related to a reference potential and the signal transmitters mentioned above are also eliminated.
- You can advantageously feed all modules from the same voltage source, namely the intermediate circuit voltage, which also the electronic components, including the Microprocessor supplied.
- the control elements such as magnets, valves etc. can therefore also be supplied with PWM technology via the DC link voltage. This leads to a saving of the relatively expensive voltage source with 24 V DC voltage and for a short time 10 A.
- These control elements are designed for the intermediate circuit voltage, so that the current is reduced in inverse proportion to the voltage increase compared to the 24 V supply. If one also takes into account the operating conditions occurring in this circuit, the voltage fluctuates in a ratio of 1: 2.
- the DC link voltage is measured at short intervals, namely a few ms by an A / D converter.
- the microprocessor can then determine a pulse-pause duty cycle at a predetermined frequency in such a way that the control elements see a voltage that is constant on average, even though they are controlled from the intermediate circuit.
- the maximum voltage for the control elements that can be obtained from the DC link corresponds to the minimum value of the DC link voltage that occurs at the lowest input voltage and maximum motor load.
- the control elements should preferably be designed for this voltage, so that the control elements can be used with smaller currents.
- FIG. 1 is a block diagram of the invention
- FIG. 2 shows a detail of the control according to FIG. 1.
- 5 with the network connection is designated in the form of an AC voltage. This is connected to a rectifier circuit, denoted overall by 6, to the output of which a capacitor, denoted overall by 7, is connected.
- the so-called intermediate circuit voltage is present at this.
- a voltage of + 5V for the microprocessor 9 and a monitoring and control circuit 10 for the bridge 11 of the main drive, which is denoted overall by 12, in the form of a motor, is applied via a power supply unit designated by 8.
- the output of the microprocessor 9 is connected to the control elements (not shown) 14 via control elements 13.
- the controls are connected to the DC link voltage.
- the microprocessor 9 together with the wiring is shown in more detail in FIG. 2.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Textile Engineering (AREA)
- Control Of Ac Motors In General (AREA)
- Control Of Electric Motors In General (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97915397A EP0900470A1 (en) | 1996-05-22 | 1997-03-18 | Electrical control system for a sewing-machine drive |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19620533.6 | 1996-05-22 | ||
DE1996120533 DE19620533A1 (en) | 1996-05-22 | 1996-05-22 | Electrical control for a sewing drive |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997044885A1 true WO1997044885A1 (en) | 1997-11-27 |
Family
ID=7794967
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1997/001388 WO1997044885A1 (en) | 1996-05-22 | 1997-03-18 | Electrical control system for a sewing-machine drive |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0900470A1 (en) |
DE (1) | DE19620533A1 (en) |
TW (1) | TW398114B (en) |
WO (1) | WO1997044885A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2431303B (en) * | 2005-10-15 | 2009-01-14 | Ebm Papst Uk Ltd | EC motor control |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4545464A (en) * | 1982-03-09 | 1985-10-08 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for controlling an A-C power elevator |
US4761726A (en) * | 1987-10-23 | 1988-08-02 | Westinghouse Electric Corp. | Variable speed constant frequency power system with boost converter auxiliary output |
DE4105132C1 (en) * | 1991-02-15 | 1991-12-12 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De | Non-potential generating supply circuitry for electric motor - has transformer with sec. winding supplying control and auxiliary units of inverter |
DE4109233A1 (en) * | 1991-03-21 | 1992-09-24 | Rexroth Mannesmann Gmbh | DIGITAL CONTROL ELECTRONICS WITH PULSE WIDTH MODULATED (PWM) OUTPUT SIGNAL FOR CONTROLLING ELECTRICAL ACTUATORS OF A HYDRAULIC SYSTEM |
-
1996
- 1996-05-22 DE DE1996120533 patent/DE19620533A1/en not_active Withdrawn
-
1997
- 1997-03-18 EP EP97915397A patent/EP0900470A1/en not_active Withdrawn
- 1997-03-18 WO PCT/EP1997/001388 patent/WO1997044885A1/en not_active Application Discontinuation
- 1997-06-11 TW TW86108029A patent/TW398114B/en active
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4545464A (en) * | 1982-03-09 | 1985-10-08 | Mitsubishi Denki Kabushiki Kaisha | Apparatus for controlling an A-C power elevator |
US4761726A (en) * | 1987-10-23 | 1988-08-02 | Westinghouse Electric Corp. | Variable speed constant frequency power system with boost converter auxiliary output |
DE4105132C1 (en) * | 1991-02-15 | 1991-12-12 | Licentia Patent-Verwaltungs-Gmbh, 6000 Frankfurt, De | Non-potential generating supply circuitry for electric motor - has transformer with sec. winding supplying control and auxiliary units of inverter |
DE4109233A1 (en) * | 1991-03-21 | 1992-09-24 | Rexroth Mannesmann Gmbh | DIGITAL CONTROL ELECTRONICS WITH PULSE WIDTH MODULATED (PWM) OUTPUT SIGNAL FOR CONTROLLING ELECTRICAL ACTUATORS OF A HYDRAULIC SYSTEM |
Also Published As
Publication number | Publication date |
---|---|
TW398114B (en) | 2000-07-11 |
DE19620533A1 (en) | 1997-11-27 |
EP0900470A1 (en) | 1999-03-10 |
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