WO2017130701A1

WO2017130701A1 - Stator, rotary electric machine, and electric accessory device for automobile

Info

Publication number: WO2017130701A1
Application number: PCT/JP2017/000695
Authority: WO
Inventors: 英樹北村; 一農田子; 裕司辻; 金澤　宏至
Original assignee: 日立オートモティブシステムズエンジニアリング株式会社
Priority date: 2016-01-29
Filing date: 2017-01-12
Publication date: 2017-08-03
Also published as: JPWO2017130701A1; JP6500127B2

Abstract

Provided are a low-vibration stator, a rotary electric machine, and an electric accessory device for an automobile, which have reduced electromagnetic excitation force. The stator 20 is equipped with: 18n (n being an integer of 1 or more) teeth 22 arranged opposing a rotor having 14n or 22n magnetic poles; and stator coils 25 wound around the teeth in a concentrated-winding method. The stator coils include an independent-phase coil group 251 wherein the stator coils wound around adjacent teeth have different phases, and a continuous-phase coil group 252 wherein the stator coils wound around adjacent teeth have the same phase, and the maximum amount of magnetic flux inside the teeth around which the independent-phase coils are wound is greater than the maximum amount of magnetic flux inside the teeth around which the continuous-phase coils are wound.

Description

Stator, rotating electrical machine, and automotive electric auxiliary device

The present invention relates to a stator, a rotating electrical machine, and an electric auxiliary device for an automobile.

With the replacement of the hydraulic power steering device by electrification and the introduction of hybrid vehicles (HEV) and electric vehicles (EV), the installation rate of electric power steering (hereinafter referred to as EPS) devices is rapidly increasing. .

In the EPS device, the rotating electrical machine assists the human hand. For this reason, the driver feels the torque pulsation of the rotating electrical machine through his / her steering wheel (handle). Therefore, in the rotating electrical machine for the EPS apparatus, it is necessary to reduce the cogging torque to about 1/1000 of the generated torque of the rotating electrical machine and the torque pulsation to about 1-2% of the generated torque of the rotating electrical machine.

Also, it is necessary to sufficiently reduce the noise in the passenger compartment caused by friction of the mechanical parts of the EPS device and vibration of the rotating electrical machine. In particular, in recent years, noise reduction of the engine has progressed due to functions such as idling stop, and the required specifications of vibration and noise for electrical components such as EPS devices have become strict.

As a vibration source caused by the rotating electrical machine that leads to vibration and noise in the vehicle interior, there are torque fluctuations (cogging torque and torque pulsation) generated in the output shaft of the rotating electrical machine and electromagnetic excitation force generated in the rotating electrical machine. is there.

In particular, as a technique for reducing the electromagnetic excitation force, Patent Document 2 discloses that the ratio of the number of magnetic poles of a rotor of a concentrated winding type rotating electrical machine to the number of slots of a stator is set to 14:18 or 22:18, thereby vibrating It is disclosed that the spatial secondary component of the electromagnetic excitation force having a large influence on the frequency can be reduced as compared with the case of 10:12 or 14:12.

International Publication No. 2013/080374

In a concentrated winding type rotating electrical machine, it is known that there are 8: 9 or 10: 9, or 10:12 or 14:12 as a ratio of the number of magnetic poles and the number of slots having a high winding coefficient and a small cogging torque. It has been. However, these combinations have a problem that vibration tends to increase because low-order electromagnetic excitation force such as space primary or space secondary that has a large influence on vibration is generated.

In the case of 14:18 or 22:18 shown in Patent Document 1, the spatial secondary component of the electromagnetic excitation force is smaller than in the case of 10:12 or 14:12, so that vibration can be reduced. However, since the spatial secondary component of the electromagnetic excitation force does not disappear completely, it is necessary to further reduce the spatial secondary component of the electromagnetic excitation force in order to further suppress the vibration of the rotating electrical machine.

Therefore, there is room for improvement in the conventional technology with respect to the reduction of the electromagnetic excitation force.

Therefore, an object of the present invention is to provide a low-vibration stator, a rotating electrical machine, and an automotive electric auxiliary device with reduced electromagnetic excitation force.

In order to solve the above problems, for example, the configuration described in the claims is adopted.

The present application includes a plurality of means for solving the above-mentioned problems. For example, a stator arranged to face a rotor having 14n (n is an integer of 1 or more) or 22n magnetic poles. The stator coil includes 18n teeth and a concentrated winding type stator coil wound around the teeth, and the stator coil is different in the phase of the stator coil wound around the adjacent teeth. The single phase coil group and the continuous phase coil group in which the phase of the stator coil wound around the adjacent teeth is the same, and the maximum magnetic flux amount inside the tooth around which the single phase coil is wound is the continuous phase. It is characterized by being larger than the maximum magnetic flux amount inside the tooth around which the coil is wound.

According to the present invention, it is possible to provide a low-vibration stator, a rotating electric machine, and an electric auxiliary machine device for automobiles with reduced electromagnetic excitation force.

Issues, configurations, and effects other than those described above will be clarified by the description of the following examples.

14 is a vertical sectional view in the axial direction of a rotating electrical machine having 14 poles and 18 slots. FIG. The vector diagram showing the phase relationship of the magnetic flux in each tooth in the rotating machine with 14 poles and 18 slots. The vector diagram showing the phase relationship of the magnetic flux in each tooth | gear in which the induced voltage of three phases in a 14 pole -18 slot rotary electric machine becomes the maximum. FIG. 6 is a vertical sectional view in the axial direction of a rotating electrical machine showing a phase arrangement in which a three-phase induced voltage is maximum in a rotating machine having 14 poles and 18 slots. The circuit diagram which showed the coil connection of the rotating electrical machine of 14 poles-18 slots. Calculation result of spatial secondary component of electromagnetic excitation force of a rotating machine with 14 poles and 18 slots. Schematic diagram of the spatial secondary component of the electromagnetic excitation force generated by the single-phase coil group 251 and the spatial secondary component of the electromagnetic excitation force generated by the continuous-phase coil group 252 in a 14 pole-18 slot rotary electric machine (current phase) 0 degree). Schematic diagram of the spatial secondary component of the electromagnetic excitation force generated by the single-phase coil group 251 and the spatial secondary component of the electromagnetic excitation force generated by the continuous-phase coil group 252 in a 14 pole-18 slot rotary electric machine (current phase) 60 degrees). FIG. 3 is a circuit diagram showing coil connection of a rotating machine with 14 poles and 18 slots according to the first embodiment. The calculation result of the spatial secondary component of the electromagnetic excitation force of the rotating machine with 14 poles and 18 slots in the first embodiment. FIG. 6 is a circuit diagram showing coil connection of a rotating machine with 14 poles and 18 slots in the second embodiment. The calculation result of the spatial secondary component of the electromagnetic excitation force of the rotating machine with 14 poles and 18 slots in the second embodiment. FIG. 7 shows the calculation results of torque of a rotating machine with 14 poles and 18 slots in Example 2. FIG. FIG. 12 is a vertical sectional view in the axial direction of a rotating electrical machine having 14 poles and 18 slots according to a third embodiment. FIG. 9 is a vertical sectional view in the axial direction of a rotating electrical machine having 14 poles and 18 slots according to a fourth embodiment. FIG. 9 is a vertical sectional view in the axial direction of a rotating electrical machine having 22 poles and 18 slots according to a fifth embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In Example 1-4, a case where the ratio of the number of magnetic poles to the number of slots is 14:18 will be described by taking a rotating electric machine having 14 magnetic poles and 18 slots (14 poles to 18 slots) as an example. In the fifth embodiment, a rotating electrical machine having 22 magnetic poles and 18 slots (22 poles-18 slots) will be described as an example when the ratio of the number of magnetic poles to the number of slots is 22:18.

First, the structure of a rotating machine with 14 poles and 18 slots, coil phase arrangement, coil connection, and electromagnetic excitation force will be described with reference to FIGS. 1-7.

<Structure of rotating electrical machine>
FIG. 1 is a vertical sectional view in the axial direction of a rotating machine having 14 poles and 18 slots. A rotating electrical machine having 14 poles and 18 slots includes a rotor 10 and a stator 20.

The rotor 10 includes a

rotor core

11 and 14 permanent magnets 12 arranged on the outer peripheral surface (in some cases, inside) of the rotor core. The magnetization direction of the permanent magnet 12 is the radial direction of the rotating electrical machine, and N, S, N, S, and the magnetic poles are alternately changed along the circumferential direction.

The stator 20 includes a stator core 21 and a concentrated winding type stator coil 25. The stator core 21 includes 18 teeth 22 projecting opposite to the rotor 10, a core back 23 for forming a magnetic path on the stator outer periphery side of the teeth, and between the teeth adjacent to the core back. And a slot 24 for the formed winding. The stator coil 25 is intensively wound around the teeth 22 and accommodated in the slots 24.

<Coil phase arrangement>
A method for determining the coil phase arrangement will be described with reference to FIGS.

2 is a vector diagram showing the phase relationship of magnetic flux in each tooth in a rotating machine with 14 poles and 18 slots. The vector numbers in the figure correspond to the teeth numbers in FIG. 1, and the phase of the magnetic flux in each tooth when the rotor is rotated counterclockwise in FIG. 1 is shown. After the amount of magnetic flux of the tooth of number 1 becomes the maximum, the amount of magnetic flux of the tooth of number 14 then becomes the maximum and continues with

numbers

9, 4, 17,.

Fig. 3 shows a vector diagram showing the phase relationship of magnetic flux in each tooth where the three-phase induced voltage is maximum in a rotating machine with 14 poles and 18 slots. In determining the coil phase arrangement, it is necessary to determine the coil phase of each tooth so that the three-phase induced voltage is maximized. Since the phase relationship of the induced voltage and the phase relationship of the magnetic flux in each tooth are the same, the vector diagram of the magnetic flux with the maximum induced voltage is as shown in FIG. Here, the vectors of

numbers

4, 5, 6, 10, 11, 12, 16, 17, 18 were inverted. This operation is equivalent to reversing the coil winding method. In addition, although the groups of

numbers

1, 5, 9, 10, 14, and 18 are U phases, other groups may be U phases, and the V and W phases are delayed by 120 degrees and 240 degrees from the U phase groups. Assign to a group.

FIG. 4 shows an axial sectional view of the rotating electrical machine showing a phase arrangement in which the induced voltage of the three phases is maximum in the rotating machine of 14 poles and 18 slots. In FIG. 3, a minus sign is given to the coil phase in which the vector is inverted. As shown in FIG. 4, the phase arrangement of the coils of the 14-pole-18-slot rotary electric machine includes a single-phase coil group 251 in which the phases of adjacent coils are different and a continuous-phase coil group 252 in which the phases of adjacent coils are the same. And exist. Hereinafter, in the drawings, the phase of the single phase coil group 251 is underlined to distinguish it from the continuous phase coil group 252.

<Coil connection>
FIG. 5 is a circuit diagram showing coil connection of a rotating machine having 14 poles and 18 slots. Although only the U phase is shown in the figure, it is assumed that the V and W phases are similarly connected. The power supply includes a power device such as an inverter. Further, although the coil connection is shown as a Y connection, a Δ connection may be used. There are 6 series and 1 parallel, 3 series and 2 parallel, 2 series and 3 parallel, and 1 series and 6 parallel as coil connections for a rotating machine with 14 poles and 18 slots. In the present invention, since it is desirable that the single-phase coils are uniformly included in each series portion of the parallel circuit, three series and two parallel are used. In the figure, N is the number of coil turns (N is an integer of 1 or more).

<Characteristics of electromagnetic excitation force>
The characteristics of the electromagnetic excitation force of a rotating machine with 14 poles and 18 slots will be described with reference to FIGS.

Fig. 6 shows the calculation result of the spatial secondary component of the electromagnetic excitation force of a rotating machine with 14 poles and 18 slots. This is because the electromagnetic stress in the air gap between the stator and the rotor is calculated by the magnetic field analysis by the finite element method, and the quadratic and temporal 14th-order components when the electromagnetic stress is Fourier series expanded in time and space. The amplitude value is shown. Here, three cases of electromagnetic excitation force are shown when only the continuous phase coil group 252 is energized, when only the single phase coil group 251 is energized, and both are energized. When the electromagnetic excitation force when only the continuous phase coil group 252 is energized is 100%, the electromagnetic excitation force when only the single phase coil group 251 is energized is 67%, and both are energized. The force is 34%. The characteristic of the spatial secondary electromagnetic excitation force of a rotating machine with 14 poles and 18 slots is the difference in the spatial secondary electromagnetic excitation force when only the continuous phase coil group 252 is energized and when only the single phase coil group 251 is energized. The amount is substantially equal to the spatial secondary electromagnetic excitation force when both the single phase coil group 251 and the continuous phase coil group 252 are energized.

7A and 7B show the spatial secondary distribution of the electromagnetic excitation force generated by the single-phase coil group 251 and the space 2 of the electromagnetic excitation force generated by the continuous-phase coil group 252 in the rotating machine having 14 poles and 18 slots. A schematic diagram of the next distribution is shown. The direction of displacement from the circle of the solid curve indicates the direction of the electromagnetic excitation force. FIG. 7A shows the case where the current phase is 0 degree, and FIG. 7B shows the case where the current phase is 60 degrees. From FIG. 7A, since the current amplitudes of the U, V, and W phases are 1.0, −0.5, and −0.5 when the current phase is 0 degree, they are generated in the single phase coil group 251 and the continuous phase coil group 252. The spatial secondary distributions of the electromagnetic excitation forces that are generated are shifted from each other by a mechanical angle of 90 degrees and cancel each other. As a result, the space secondary electromagnetic excitation force of the rotating machine with 14 poles and 18 slots is the difference between the electromagnetic excitation force when only the continuous phase coil group 252 is energized and when only the single phase coil group 251 is energized. . This is the same even if the current phase changes, and the same phenomenon occurs at a current phase of 60 degrees as shown in FIG. 7B.

Example 1 will be described with reference to FIGS. 8-9.

FIG. 8 is a circuit diagram showing the coil connection of the rotating machine with 14 poles and 18 slots in the first embodiment. Although only the U phase is shown in the figure, it is assumed that the V and W phases are similarly connected. The power supply includes a power device such as an inverter. The coil connection is a Y connection, but may be a Δ connection.

In this example, the number of turns per coil (per tooth) of the continuous phase coil group 252 was N turns, and the number of turns of the single phase coil group 251 was 1.5 N turns. However, since the minimum number of turns is 0.5, the 1.5N turn is raised or lowered every 0.5 turns.

FIG. 9 shows the calculation result of the spatial secondary component of the electromagnetic excitation force of the rotating machine with 14 poles and 18 slots in Example 1. This is because the electromagnetic stress in the air gap between the stator and the rotor is calculated by the magnetic field analysis by the finite element method, and the quadratic and temporal 14th-order components when the electromagnetic stress is Fourier series expanded in time and space. The amplitude value is shown. By setting the number of turns of the single-phase coil group 251 to 1.5N, the electromagnetic excitation force when only the single-phase coil group 251 is energized becomes 97%, and both the continuous-phase coil group 252 and the single-phase coil group 251 In both cases, the electromagnetic excitation force when energized is 5%. The spatial secondary electromagnetic excitation force is the difference between the spatial secondary electromagnetic excitation force when only the continuous phase coil group 252 is energized and when only the single phase coil group 251 is energized. By increasing the magnetic force, the amount of difference from the spatial secondary electromagnetic excitation force when only the continuous phase coil group 252 is energized is reduced, and the electromagnetic excitation force of the rotating machine having 14 poles and 18 slots is reduced. From this, the vibration of the rotating electrical machine can be reduced by making the amount of magnetic flux inside the teeth around which the single phase coil group 251 is wound larger than the amount of magnetic flux inside the teeth around which the continuous phase coil group 252 is wound.

In Example 1, since the secondary secondary electromagnetic excitation force by the single phase coil group 251 is about 67% from FIG. 6, the number of turns of the single phase coil group 251 is 1.5 (≈100 ÷ 67) N ±. It is desirable to be within 0.1N turns.

There are two types of coil turns: integer winding and integer winding. In the integer winding, the number of turns is an integer, and the winding start and winding end of the coil wire are in the same direction. In the integer winding, the number of turns is a decimal number (integer + 0.5), and the winding start and winding end of the coil wire are in opposite directions. In the first embodiment, in order to suppress the influence of variation due to the number of turns, it is desirable that both the single-phase coil group 251 and the continuous-phase coil group 252 have an integer winding or an integer winding.

Example 2 will be described with reference to FIGS. 10-12.

FIG. 10 is a circuit diagram showing the coil connection of a rotating machine with 14 poles and 18 slots in the second embodiment. Although only the U phase is shown in the figure, it is assumed that the V and W phases are similarly connected. The power supply includes a power device such as an inverter. The coil connection is a Y connection, but may be a Δ connection. In the second embodiment, there are two power sources for driving the rotating electrical machine, the first power source V ₁ and the second power source V ₂ , the first power source and the continuous phase coil group 252 are connected, and the second power source and the single phase coil group 251. Is connected. The number of turns of the continuous phase coil group 252 and the single phase coil group 251 is N turns. The current from the first power source is I amperes, and the current from the second power source is 1.5 I amperes.

FIG. 11 shows the calculation result of the spatial secondary component of the electromagnetic excitation force of the rotating machine having 14 poles and 18 slots according to the second embodiment. This is because the electromagnetic stress in the air gap between the stator and the rotor is calculated by the magnetic field analysis by the finite element method, and the quadratic and temporal 14th-order components when the electromagnetic stress is Fourier series expanded in time and space. The amplitude value is shown. By setting the current from the second power source V ₂ to 1.5 I ampere, the electromagnetic excitation force when only the single phase coil group 251 is energized becomes 100%, and both the continuous phase coil group 252 and the single phase coil group 251 are both. The electromagnetic excitation force when energized is 2%. Since the current I can be adjusted as a continuous amount, the electromagnetic excitation force can be reduced as compared with the first embodiment.

FIG. 12 shows the calculation results of the torque of the rotating machine with 14 poles and 18 slots in Example 2. Torque was calculated by magnetic field analysis by finite element method. Here, three cases of torque are shown when only the current from the first power source V ₁ is passed, only the current from the second power source V ₂ is passed, and both are passed. From the figure, although the magnetomotive force per coil differs between the continuous phase coil group 252 and the single phase coil group 251, the time variation of the torque is small and the torque pulsation is low. This is because, in the vector diagram of FIG. 3, the vectors (

numbers

2, 5, 8, 11, 14, and 17) of the single-phase coil group 251 have a phase difference of 120 degrees from each other, and a three-phase balance is established. Therefore, even if the magnetomotive force of the single phase coil group 251 is increased, the torque pulsation does not increase. Another advantage of the present embodiment, even if either of the first power supply V ₁ or the second power supply V ₂ is failed, it is possible to maintain the torque 50%, improve the reliability of the system be able to.

In Example 2, the spatial secondary electromagnetic excitation force by the single-phase coil group 251 is about 67% from FIG. 6, so that the current of the single-phase coil group 251 is 1.5 (≈100 ÷ 67) I ± 0. Desirably within 1 IA.

In Example 2, if you want to decrease the second power supply V ₂ of the current, it is possible to reduce the current alone phase coil group 251 by serial connection. Further, when it is desired to lower the voltage of the first power supply V ₁ , it is possible to reduce the voltage by making only the continuous phase coil group 252 a Δ connection. Also, if you want to decrease the second voltage power supply V ₂ is possible to reduce the voltage by only a single phase coil group 251 to Δ connection.

Example 3 will be described with reference to FIG.

FIG. 13 is a vertical sectional view in the axial direction of a rotating electrical machine having 14 poles and 18 slots according to the third embodiment. The stator core 21 of the present embodiment is divided at the core back portion. In the divided stator core (divided core), the width of the teeth 221 wound with the single-phase coil group is larger than the width of the teeth 222 wound with the continuous-phase coil group.

By making the width of the tooth around which the single-phase coil group 251 is wound larger than the width of the tooth around which the continuous-phase coil group 252 is wound, the magnetic resistance of the path of the magnetic flux generated by the single-phase coil group 251 is reduced. Since the magnetic resistance of the path of the magnetic flux generated by 252 can be made smaller and the amount of magnetic flux inside the teeth around which the single phase coil group 251 is wound can be made larger than the amount of magnetic flux inside the teeth around which the continuous phase coil group 252 is wound. Can be reduced. By dividing the stator core, the material yield and the coil space factor can be improved, but this effect can be obtained without dividing.

Example 4 will be described with reference to FIG.

FIG. 14 is a vertical sectional view in the axial direction of a rotating electrical machine having 14 poles and 18 slots according to the fourth embodiment. The stator core 21 of the present embodiment is divided at the core back portion. The first electromagnetic steel plate 211 is used for the teeth 221 wound with the single phase coil group, and the second electromagnetic steel plate 212 is used for the teeth 222 wound with the continuous phase coil group. The permeability is higher than the permeability of the second electromagnetic steel plate.

By making the magnetic permeability of the first electromagnetic steel plate higher than the magnetic permeability of the second electromagnetic steel plate, the magnetic resistance of the magnetic flux path generated by the single-phase coil group 251 is reduced by the magnetic flux generated by the continuous-phase coil group 252. Since the magnetic resistance of the path can be made smaller and the amount of magnetic flux inside the teeth around which the single phase coil group 251 is wound can be made larger than the amount of magnetic flux inside the teeth around which the continuous phase coil group 252 is wound, vibration of the rotating electrical machine can be reduced. Can do.

Example 5 will be described with reference to FIG.

FIG. 15 is a vertical sectional view in the axial direction of a rotating electrical machine having 22 poles and 18 slots according to the fifth embodiment. The rotating electric machine having 22 poles and 18 slots according to the fifth embodiment includes a rotor 10 and a stator 20. The rotor includes a

rotor core

11 and 22 permanent magnets 12 arranged on the outer peripheral surface (in some cases, inside) of the rotor core, and the magnetization of the permanent magnet faces the radial direction of the rotating electrical machine. N, S, N, S, and magnetic poles are alternately arranged along the circumferential direction. The stator is composed of 18 teeth 22 projecting opposite the rotor, a core back 23 for forming a magnetic path on the stator outer periphery of the teeth, and a winding formed between the teeth adjacent to the core back. A stator core 21 composed of a wire slot 24 and a stator coil 25 wound around a tooth are provided.

The rotors synchronized with the rotating magnetic field by the coil phase arrangement of FIG. 4 are 14 poles and 22 poles, and even in the 22 pole rotor, the amount of magnetic flux inside the teeth around which the single phase coil group 251 is wound is changed to the continuous phase coil group. By making it larger than the amount of magnetic flux inside the tooth around which 252 is wound, vibration of the rotating electrical machine can be reduced.

The present invention is not limited to the case of 14 poles-18 slots or 22 poles-18 slots, but can be applied if the ratio of the number of magnetic poles to the number of slots is 14:18 or 22:18. The same effect as the embodiment can be obtained.

In addition, this invention is not limited to the above-mentioned Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. Further, it is possible to add, delete, and replace other configurations for a part of the configuration of each embodiment.

DESCRIPTION OF SYMBOLS 10 ... Rotor 11 ... Rotor core 12 ... Permanent magnet 20 ... Stator 21 ... Stator core 211 ... First electromagnetic steel plate 212 ... Second electromagnetic steel plate 22 ... Teeth 221 ... Single phase coil group is wound Teeth 222 ... Teeth around which a continuous phase coil group is wound 23 ... Core back 24 ... Slot 25 ... Stator coil 251 ... Single phase coil group 252 ... Continuous phase coil group V ₁ ... First power source V ₂ ... Second power source I ... Current

Claims

A stator arranged to face a rotor having 14n (n is an integer of 1 or more) or 22n magnetic poles,
18n teeth,
A concentrated winding stator coil wound around the teeth;
The stator coil has a single-phase coil group in which phases of stator coils wound around adjacent teeth are different, and a continuous phase coil group in which the phases of stator coils wound around adjacent teeth are the same. ,
The stator according to claim 1, wherein the maximum amount of magnetic flux inside the teeth around which the single phase coil is wound is larger than the maximum amount of magnetic flux inside the teeth around which the continuous phase coil is wound.
The stator according to claim 1,
The stator according to claim 1, wherein a magnetomotive force per coil of the single phase coil group is larger than a magnetomotive force per coil of the continuous phase coil group.
The stator according to claim 1 or 2,
The stator characterized in that the number of turns per coil of the single phase coil group is larger than the number of turns per coil of the continuous phase coil group.
The stator according to claim 3,
The stator according to claim 1, wherein the number of turns per coil of the single phase coil group is within 1.5N ± 0.1N turns, where N is the number of turns per coil of the continuous phase coil group.
The stator according to claim 1, wherein
The stator, wherein a current flowing per coil of the single phase coil group is larger than a current flowing per coil of the continuous phase coil group.
The stator according to claim 5,
When the current flowing per coil of the continuous phase coil group is I ampere, the current flowing per coil of the single phase coil group is within 1.5 (≈100 ÷ 67) I ± 0.1 I ampere. Stator characterized by that.
The stator according to any one of claims 1 to 6,
The stator according to claim 1, wherein a magnetic resistance of a path of magnetic flux generated by the single phase coil group is smaller than a magnetic resistance of a path of magnetic flux generated by the continuous phase coil group.
The stator according to any one of claims 1 to 7,
The stator, wherein the continuous phase coil group is connected to a first power source, and the single phase coil group is connected to a second power source.
A stator arranged to face a rotor having 14n (n is an integer of 1 or more) or 22n magnetic poles,
18n teeth,
A concentrated winding stator coil wound around the teeth;
The stator coil has a single-phase coil group in which phases of stator coils wound around adjacent teeth are different, and a continuous phase coil group in which the phases of stator coils wound around adjacent teeth are the same. ,
The stator characterized in that the number of turns per coil of the single phase coil group is larger than the number of turns per coil of the continuous phase coil group.
The stator according to any one of claims 1 to 9, which has 18n (n is an integer of 1 or more) teeth,
A rotor having 14n or 22n magnetic poles arranged opposite to the stator;
Rotating electric machine with
An electric auxiliary equipment for automobiles equipped with the rotating electrical machine according to claim 10.