WO2018030153A1

WO2018030153A1 - Three-phase rotary electric machine for starter generator

Info

Publication number: WO2018030153A1
Application number: PCT/JP2017/027049
Authority: WO
Inventors: 典樹森本; 萩村　将巳
Original assignee: 株式会社ミツバ
Priority date: 2016-08-12
Filing date: 2017-07-26
Publication date: 2018-02-15
Also published as: JP2018026985A; CN109565230A

Abstract

In the present invention, when n is a natural number of 3 or greater, the number of teeth (16) is T, and the number of poles of a permanent magnet (8) is P, the number T of the teeth (16) and the number of poles P are set so as to satisfy the equation P:T = 3n±1:3n when n is an odd number, and are set so as to satisfy the equation P:T = 3n±2:3n when n is an even number. The plurality of teeth comprise a plurality of U-phase teeth (16U), a plurality of V-phase teeth (16V), and a plurality of W-phase teeth (16W), and all of the plurality of teeth (16) are arranged so as to have the same phase as at least one of the adjacent teeth (16).

Description

Three-phase rotating electrical machine for starter generator

The present invention relates to a three-phase rotating electrical machine for a starter generator.
This application claims priority on August 12, 2016 based on Japanese Patent Application No. 2016-158876 for which it applied to Japan, and uses the content here.

Among the three-phase rotating electrical machines for starter generators, for example, there is a so-called starter generator (starter generator, SG) used as a motor for starting an engine of a vehicle and as a generator after starting the engine. In many cases, the starter generator includes a bottomed cylindrical flywheel (rotor) and a stator fixed inside an engine case.
The flywheel is connected to a crankshaft extending from the engine. Further, a tile-like permanent magnet is provided on the inner peripheral surface side of the flywheel. On the other hand, teeth on which a plurality of armature coils are wound project from the stator along the circumferential direction. The plurality of armature coils are composed of three phases (U phase, V phase, W phase).

When the starter generator is used as a motor for starting the engine, a current is selectively supplied to a predetermined armature coil. In this case, a magnetic flux is formed in the teeth, and the flywheel is rotated using a magnetic attractive force or a repulsive force generated between the magnetic flux and the permanent magnet of the flywheel. As a result, the crankshaft rotates.
On the other hand, when the starter generator is used as a generator after starting the engine, the amount of magnetic flux of the permanent magnet changes as the flywheel rotates. This change in the amount of magnetic flux becomes an electromotive force to generate a current in the armature coil. The current generated in the armature coil is stored in, for example, a battery or supplied to an attached electric device.

International Publication No. 2014/156865

By the way, starter generators are designed with emphasis on the motor characteristics because the function as a motor for starting the engine is regarded as important. For this reason, the function as a generator after starting the engine varies depending on the specifications. For example, the amount of power generated when used as a generator becomes surplus, and the load on the engine may deteriorate. On the other hand, when trying to optimize the generator, there is a problem that desired motor characteristics cannot be obtained.

The present invention provides a three-phase rotating electrical machine for a starter generator that can obtain good characteristics regardless of whether it is used as a motor or a generator.

According to the first aspect of the present invention, a three-phase rotating electrical machine for a starter generator is provided with a stator in which a plurality of teeth are arranged adjacent to each other in the circumferential direction, and provided rotatably with respect to the stator. In a three-phase rotating electrical machine for a starter generator provided with a rotor provided with a plurality of magnetic poles along the direction, n is a natural number of 3 or more, the number of teeth is T, and the number of poles of the magnetic pole is P When the number T of teeth and the number P of poles are
When n is an odd number, P: T = 3n ± 1: 3n
Set to meet
When n is an even number, P: T = 3n ± 2: 3n
Set to meet
The plurality of teeth includes a plurality of first teeth around which a first phase coil is wound, a plurality of second teeth around which a second phase coil is wound, and a third phase coil. A plurality of third teeth, and all of the plurality of teeth are arranged in phase with at least one of the adjacent teeth.

According to the second aspect of the present invention, in the three-phase rotating electrical machine for a starting generator according to the first aspect of the present invention, when n is an odd number, the teeth in the same phase are all adjacent in the circumferential direction. Has been placed.

According to the third aspect of the present invention, in the three-phase rotating electrical machine for a starting generator according to the first aspect of the present invention, n is an even number, m is a natural number of 1 or more, and the number T of the teeth, When both the number of poles P is m times, 2m of in-phase teeth groups in which n / 2 in-phase teeth are arranged adjacent to each other in the circumferential direction are formed, and 2m in-phase teeth groups are These are arranged opposite to each other around the rotation axis.

According to the three-phase rotating electrical machine for a starter generator of the present invention, good characteristics can be obtained regardless of whether the starter generator is used as a starter motor or a generator.

It is a top view of the three-phase rotary electric machine for starter generators in the embodiment of the present invention. It is the graph which compared the change of the electric power of the three-phase rotary electric machine for starter generators with the general three-phase rotary electric machine for starter generators in embodiment of this invention. It is a schematic block diagram which shows the three-phase rotary electric machine for starter generators in the modification of embodiment of this invention. It is a schematic block diagram of the modification of the three-phase rotary electric machine for starter generators in embodiment of this invention. It is a schematic block diagram of the modification of the three-phase rotary electric machine for starter generators in embodiment of this invention. It is a schematic block diagram of the modification of the three-phase rotary electric machine for starter generators in embodiment of this invention. It is a schematic block diagram of the modification of the three-phase rotary electric machine for starter generators in embodiment of this invention. It is a schematic block diagram of the modification of the three-phase rotary electric machine for starter generators in embodiment of this invention. It is a schematic block diagram of the modification of the three-phase rotary electric machine for starter generators in embodiment of this invention.

Next, an embodiment of the present invention will be described based on the drawings.

(3-phase rotating electrical machine for starter generator)
FIG. 1 is a plan view of a three-phase rotating electrical machine 1 for a starter generator.
As shown in the figure, the three-phase rotating electrical machine 1 for a starter generator is of an outer rotor type used for a motorcycle, for example. In the three-phase rotating electrical machine 1 for a starter generator, a function of a generator provided with a permanent magnet and a starter motor function (engine start function) are integrated. A three-phase rotating electrical machine 1 for a starter generator includes a flywheel 2 that is fixed to a crankshaft of an engine (not shown), and that rotates in synchronization with the crankshaft, and a stator 4 that is fixed to an engine block (not shown). Yes. An armature coil 18 composed of three phases (U phase, V phase, W phase) is wound around the stator 4.

The flywheel 2 has a rotor yoke 3 formed in a substantially bottomed cylindrical shape from a metal made of a magnetic material. The bottom of the rotor yoke 3 (the back side in the drawing in FIG. 1) is fixed to a crankshaft (not shown).
On the peripheral wall 33 of the rotor yoke 3, permanent magnets 8 magnetized to 14 poles are provided on the inner peripheral surface side so that the magnetic poles are changed in order in the circumferential direction. For example, a ferrite magnet is used as the permanent magnet 8.

(Stator)
The stator 4 includes a stator core 17 that is disposed inside the peripheral wall 33 of the rotor yoke 3 and that is disposed coaxially with the rotation axis O. The stator core 17 is formed by laminating plate materials such as electromagnetic steel plates in the axial direction. The stator core 17 has a substantially annular stator body 17a. A plurality of bolt insertion holes 20 are formed in the stator body 17a along the circumferential direction. These bolt insertion holes 20 are used for fastening and fixing the stator 4 to the engine block by inserting bolts (not shown).

Twelve teeth 16 protruding outward in the radial direction are provided side by side in the circumferential direction on the outer peripheral portion of the stator body 17a. And between each tooth | gear 16, the dovetail slot 21 is formed, respectively. The armature coils 18 are passed through the slots 21, and the armature coils 18 are wound around the teeth 16 from above the insulator 40 attached to the stator core 17.

In addition, a position detection sensor (not shown) for detecting the rotational position of the flywheel 2 is attached to the stator body 17a. The position detection sensor detects the rotational position of the flywheel 2 by detecting the magnetic flux of the permanent magnet 8 provided in the rotor yoke 3 and detecting the change of the magnetic flux accompanying the rotation of the flywheel 2.

Here, in the three-phase rotating electrical machine 1 for the starting generator, when n is a natural number of 3 or more, the number of teeth 16 is T, and the number of poles of the magnetic pole is P, the number T of teeth 16 and the number of poles P Is
When n is an odd number
P: T = 3n ± 1: 3n (1)
Set to meet
When n is an even number
P: T = 3n ± 2: 3n (2)
It is set to satisfy.

In the three-phase rotating electrical machine for starter generator 1 of the present embodiment, the number T of teeth 16 is set to 12, and the number of poles P is set to 14 poles. Substituting this into equation (2) and setting n = 4 (even),
14: 12 = 3 × 4 + 2: 3 × 4
Therefore, Expression (2) is satisfied.

Each tooth 16 is assigned to three phases (U phase, V phase, W phase). And
[Condition 1] When n is an even number, m is a natural number of 1 or more, and when both the number T of teeth and the number P of poles are m times, among three phases (U phase, V phase, W phase) , N / 2 in-phase teeth 16 are arranged adjacent to each other (in a line) in the circumferential direction to form 2 m in-

phase teeth groups

86U, 86V, 86W. Then, the in-phase in-

phase tooth groups

86U, 86V, 86W are arranged to face each other about the rotation axis O.
More preferably,
[Condition 2] When the n is an odd number, the teeth 16 are arranged so that all of the in-phase teeth 16 of the three phases (U-phase, V-phase, W-phase) are adjacent (lined up) in the circumferential direction.

In this embodiment, n = 4. Therefore, a method for assigning the phases of the teeth 16 in the case where n is an even number will be described in detail below. A specific method of assigning the phases of the teeth 16 when n is an even number will be described later.
That is, the teeth 16 are assigned in the order of the U phase, U phase, V phase, V phase, W phase, W phase, U phase, U phase, V phase, V phase, W phase, and W phase in the circumferential direction. . In the following description, the U-phase teeth 16 are referred to as U-phase teeth 16U, the V-phase teeth 16 are referred to as V-phase teeth 16V, and the W-phase teeth 16 are referred to as W-phase teeth 16W.

Here, the twelve teeth 16 include two U-phase teeth groups 86U including two U-phase teeth 16U, two V-phase teeth groups 86V including two V-phase teeth 16V, and two W There are two W-phase teeth groups 86W composed of the phase teeth 16W. In other words, one

phase teeth group

86U, 86V, 86W is formed by two in-

phase teeth

16U, 16V, 16W arranged in the circumferential direction, respectively.

According to [Condition 1], since n = 4, 4/2 = 2 in-phase teeth 16 are arranged in the circumferential direction. For this reason, this embodiment satisfies [Condition 1].
In addition, two

phase teeth groups

86U, 86V, and 86W are formed. If m = 1, 2 × 1 = 2. Further, the number T and the number P of the teeth 16 are each m times (1 time). For this reason, this embodiment satisfies [Condition 1].
Further, each of the two

phase teeth groups

86U, 86V, 86W is disposed so as to face each other about the rotation axis O. For this reason, this embodiment satisfies [Condition 1].

In such a configuration, when the flywheel 2 rotates via a crankshaft (not shown), the amount of magnetic flux passing through the teeth 16 changes. This change in the amount of magnetic flux becomes an electromotive force, and a current is generated in the armature coil 18. The current generated in the armature coil 18 is stored in a battery (not shown) via the harness 26 or used for power supply to an attached electric machine (not shown).

On the other hand, when starting an engine (not shown), the current stored in the battery is supplied to the armature coil 18 via the harness 26. At this time, a current is selectively supplied to the armature coil 18 of a predetermined phase wound around each tooth 16. Then, a magnetic flux is sequentially formed in the teeth 16 of each phase. Then, a magnetic attractive force or a repulsive force is generated between the magnetic flux and the permanent magnet 8 provided on the flywheel 2, and the flywheel 2 rotates. Further, a crankshaft (not shown) is rotated via the flywheel 2 and the engine is started.

FIG. 2 is a graph showing a change in electric power when the vertical axis is the electric power [W] input to the three-phase rotating electrical machine for the starter generator and the horizontal axis is the rotational speed [r / min] of the flywheel, The three-phase rotating electrical machine for starter generator 1 of this embodiment is compared with a general three-phase rotating electrical machine for starter generator. Here, the general three-phase rotating electric machine for starter generator referred to here is a three-phase rotating electric machine for starter generator in which the number of teeth 16 (number of slots) is set to 18 for 12 poles. It is. Further, the U phase, the V phase, and the W phase are assigned in this order in the circumferential direction to the teeth of this general three-phase rotating electrical machine for a starting generator.

As shown in FIG. 2, it can be confirmed that the three-phase rotating electrical machine for starter generator 1 of the present embodiment is driven with a smaller input [W] as compared with a general three-phase rotating electrical machine for starter generator. .

Thus, in the above-mentioned embodiment, when n is a natural number of 3 or more, the number of teeth 16 is T, and the number of poles of the magnetic pole is P, the number T of teeth 16 and the number P of poles are given by the formula ( 2) is set to satisfy. Further, the above [Condition 1] is satisfied as a method of assigning the three phases (U phase, V phase, W phase) of each tooth 16. For this reason, the three-phase rotating electrical machine 1 for the starter generator can obtain better characteristics than the conventional one in both the starter motor function (engine start function) and the power generation function after the engine start. it can.

In the above-described embodiment, as the three-phase rotating electrical machine 1 for a starting generator, the number P of magnetic poles is set to “14”, the number T of teeth 16 is set to “12”, and n = 4. The case where [Condition 1] is satisfied has been described. However, the present invention is not limited to this, and the three-phase rotating electrical machine 1 for a starter generator satisfies either the above formula (1) or the above formula (2), and either [Condition 1] or [Condition 2]. It is only necessary to be set so as to satisfy. In other words, the teeth 16 may be disposed so as to be in phase with at least one of the adjacent teeth 16. Hereinafter, the modification of the three-phase rotary electric machine 1 for starter generators is given concretely.

(Modification)
FIG. 3 is a schematic configuration diagram showing a modified example of the three-phase rotating electrical machine 1 for a starter generator that satisfies n = 4, the above formula (2), and [Condition 1].
As shown in the figure, even when the number of teeth 16 (number of slots 21) T is set to 12 and the number P of magnetic poles is set to 10 poles, n is a natural number of 3 or more. And m = 1, which satisfies the above formula (2) and [Condition 1].

As shown in FIGS. 4A and 4B, the three-phase rotating electrical machine 1 for a starter generator that satisfies n = 3, the above formula (1), and [Condition 2] may be used.
Further, as shown in FIGS. 5A and 5B, the three-phase rotating electrical machine 1 for a starter generator that satisfies n = 5, the above formula (1), and [Condition 2] may be used.
Here, as shown in FIGS. 4A to 5B, when n is an odd number, the teeth 16 of the three phases (U phase, V phase, W phase) are all adjacent in the circumferential direction. Be placed.

That is, as shown in FIGS. 4A and 4B, in the stator 4 in which three in-

phase teeth

16U, 16V, and 16W are provided, all the three in-

phase teeth

16U, 16V, and 16W are continuous in the circumferential direction. Are arranged in a line.
Further, as shown in FIGS. 5A and 5B, in the stator 4 provided with five in-

phase teeth

16U, 16V, and 16W, all the five in-

phase teeth

16U, 16V, and 16W are continuous in the circumferential direction. Are arranged in a line.

As shown in FIGS. 6A and 6B, the three-phase rotating electrical machine 1 for a starter generator that satisfies n = 6, the above formulas (1), (3), and [Condition 1] may be used.
In this three-phase rotating electrical machine 1 for starter generator, since n is an even number, m = 1, the number T of teeth 16 and the number of poles P are m times (1 time), and satisfy [Condition 1], Three in-

phase teeth

16U, 16V, 16W are arranged side by side in the circumferential direction to form two in-

phase teeth groups

86U, 86V, 86W. Then, the in-phase in-

phase tooth groups

86U, 86V, 86W are arranged to face each other about the rotation axis O.
Thus, for the starter generator set so as to satisfy the above-mentioned formula (1) and either of the formula (2) or the formula (3) and satisfy either [condition 1] or [condition 2] The three-phase rotating electrical machine 1 has the same effect as the above-described embodiment.

DESCRIPTION OF SYMBOLS 1 ... Three-phase rotary electric machine for starter generators 2 ... Flywheel (rotor)
4 ... Stator 8 ... Permanent magnet (magnetic pole)
16 ... Teeth 16U ... U-phase Teeth (First Teeth)
16V ... V phase teeth (second teeth)
16W ... W phase teeth (3rd tooth)
18 ... Armature coil (coil)
60 ... Crankshaft 86U ... U-phase teeth group (common-phase teeth group)
86V ... V phase teeth group (common phase teeth group)
86W ... W-phase teeth group (in-phase teeth group)
O ... Rotation axis

Claims

A stator in which a plurality of teeth are arranged adjacent to each other in the circumferential direction;
A rotor provided rotatably with respect to the stator, and provided with a plurality of magnetic poles along a circumferential direction;
In a three-phase rotating electrical machine for a starter generator equipped with
When n is a natural number of 3 or more, the number of teeth is T, and the number of poles of the magnetic pole is P, the number of teeth T and the number of poles P are:
When n is an odd number, P: T = 3n ± 1: 3n
Set to meet
When n is an even number, P: T = 3n ± 2: 3n
Set to meet
The plurality of teeth are:
A plurality of first teeth around which a first phase coil is wound;
A plurality of second teeth around which a second phase coil is wound;
A plurality of third teeth around which a third phase coil is wound;
Consists of
All of the plurality of teeth are three-phase rotating electrical machines for a starter generator arranged so as to be in phase with at least one of adjacent teeth.
When n is an odd number,
2. The three-phase rotating electrical machine for a starter generator according to claim 1, wherein all of the teeth in the same phase are arranged adjacent to each other in the circumferential direction.
n is an even number, m is a natural number of 1 or more,
When the number T of teeth and the number P of poles are both m times,
forming 2 m in-phase teeth groups in which n / 2 in-phase teeth are arranged adjacent to each other in the circumferential direction;
2. The three-phase rotating electrical machine for a starter generator according to claim 1, wherein the 2 m in-phase tooth groups are arranged to face each other about a rotation axis.