JPH06233512A - Rotating electric machine - Google Patents

Abstract

PURPOSE:To make it possible to significantly improve a T/N characteristic value of a rotating electric machine with a simple structure, and to achieve a smaller rotating electric machine. CONSTITUTION:By virtue of the configuration of yoke plates 26 and 28 attached to field magnets 27, the whole magnetic flux of the field magnets 27 is concentrated onto iron cores 23 of an armature while the magnetic flux is inverted. Multiple poles are realized by the structure that causes the whole magnetic flux of the field magnet 27 to be concentrated without dispersion thereof. For this reason, it is not necessary to carry out multipolar polarization of field magnets in the manner as is conventionally practiced. Moreover, the magnetic flux of the field magnets 27 can be constantly utilized up to the maximum while the simple construction of the armature is maintained. This makes it possible to simultaneously increase both an effective magnetic flux PHI and the number of poles. A simple construction is obtained by disposing the iron cores 23 having different phases in an arrangement which constitutes a parallel magnetic circuit.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotating electric machine having an armature and a field magnet provided so as to move relatively.

[0002]

2. Description of the Related Art In recent years, various rotary electric machines have been developed. One example of conventional rotary electric machines is a three-phase motor having a structure shown in FIGS. This is the so-called 2-
This is a motor called 3 (number of magnetic poles-number of core poles) structure, in which the hollow cylindrical field magnet 2 is fixed to the inner peripheral wall of the casing 1, and the field magnet 2 is provided on the inner peripheral side thereof. The armature 3 is rotatably arranged. The field magnet 2 is magnetized so as to form two different magnetic poles N and S in the circumferential direction, and the armature 3 approaches the inner peripheral wall of the field magnet 2 to generate a magnetic flux. Three salient poles 3a,
3a, 3a, and coils 3b, 3b, 3b are wound around each salient pole 3a.

As a multi-pole type rotary electric machine, for example, FIG.
There is a motor having a structure as shown in FIG. In this structure, different magnetic poles N and S are arranged along the circumferential direction on the hollow cylindrical field magnet 12 fixed to the inner peripheral wall of the casing 11.
Are magnetized at a predetermined pitch, and the armature 13 is rotatably arranged on the inner peripheral side of the field magnet 12.
Are provided with a large number of salient poles 13a, 13a, ....
A coil 13b is wound around each of these salient poles 13a.

[0004]

However, in such conventional rotary electric machines, there is a problem that the so-called T / N characteristic value is still insufficient. That T / N characteristic value is the quotient of the torque T in the T-N characteristic of the rotating electric machine and the rotation speed N, specifically, T / N characteristic value _{= T S / N O = ΔT} / ΔN = K It is represented by _E・ K _T / R. Here, T _S ; starting torque N _O ; no-load rotation speed K _E ; back electromotive force constant K _T ; torque constant R; internal resistance.

This T / N characteristic value represents the size of the T-N characteristic which is the basis of the rotary electric machine, and the sizes of the rotary electric machine can be compared. For example, a rotating electrical machine with T / N = 3 can provide the same T-N characteristics as when three rotating electrical machines with T / N = 1 are simultaneously rotated. More specifically, the T / N characteristic value is proportional to about the square of the volume of the rotating electric machine (more accurately, to the 5/3 power), and has a relationship substantially proportional to the BH _{MAX of the} field magnet. is doing. Therefore, conventionally, when trying to use a larger motor or strong magnet, the result is T
It is intended to increase the / N characteristic value.

When the T / N characteristic value is increased, the following is possible. 1) Increase in generated torque. 2) Reduction of rise time. 3) Increasing torque constant and back electromotive force constant. 4) Reduction of rated current. 5) Reduction of loss (copper loss). 6) Higher efficiency. 7) Reduction of heat generation. 8) Increased output. 9) Reduction of the influence on the rotation speed fluctuation due to load fluctuation.

If the T / N characteristic value has a margin,
Depending on how you use it, you can do the following. 1) Miniaturization, thinning, and weight reduction of rotating electric machines. 2) Lower costs by reviewing materials. 3) Greater freedom of design.

As described above, many of the various proposals relating to the rotary electric machine that have been conventionally proposed result in obtaining a higher T / N characteristic value. That is, the requirements for making the rotating electric machine lighter, thinner, shorter and smaller, power saving, resource saving, and lower price are based on (T / N characteristic value) / (physique) and (T / N characteristic value). / (Cost), and how to efficiently obtain the T / N characteristic value has been a conventional problem.
For example: 1) Miniaturization, thinning, and weight reduction. 2) Extension of starting torque. 3) Shorter rise time. 4) Reduction of current value. 5) Reduction of loss (copper loss). 6) Streamline. Therefore, many proposals relating to the technology of the rotary electric machine can be said to be studies for improving the T / N characteristic value as a result. Practically, the T / N characteristic value is 5% to 10
% Difference is competing.

Next, as factors for determining such T / N characteristic values, P (number of magnetic poles), Φ (effective magnetic flux), H (number of parallel coils), A (coil cross-sectional area), L (per 1T). Coil length), which can be expressed by an equation: T / N characteristic value = P ² · Φ ² · H · A / L ... Therefore, the T / N characteristic value becomes maximum when these elements are combined so as to maximize the total.
In particular, the point is how to increase P ² × Φ ² .

From this point of view, in the case of the rotary electric machine of the so-called 2-3 (number of magnetic poles-number of core poles) structure shown in FIGS. 11 and 12, the magnetic poles in a three-phase motor are considered. The number and the number of salient poles are the minimum combination,
For example, in the illustrated positional relationship, the total magnetic flux of the N pole is concentrated on one salient pole 3a as indicated by the arrow. Therefore, the effective magnetic flux Φ is large. However, since the number of magnetic poles P is 2, there is a limit to the improvement of the T / N characteristic value.

On the other hand, in the multi-pole type shown in FIG.
The T / N characteristic value is improved by increasing the number of magnetic poles P and the number of parallel coils H and simultaneously reducing the coil length L. However, the salient pole 13a of the armature 13 and the field The facing area per salient pole with the magnet 12 is small, and the magnetic flux is dispersed and used. That is, since the same total magnetic flux is used by dividing it into multiple poles, the number of magnetic poles P is increasing, but the effective magnetic flux Φ is decreasing.
The value of ² × Φ ² has not changed. Further, although the number H of parallel coils can be increased, the reduction in the coil cross-sectional area A cancels out and the structure becomes complicated, but the T / N characteristic value cannot be significantly improved. Therefore, in the case of this multi-pole type, in the present situation, a magnet having a large BH _MAX is adopted to obtain an effective magnetic flux Φ to improve the T / N characteristic value.

As described above, the conventional rotary electric machine has a problem that the T / N characteristic value can be improved only by a method that uses a strong magnet and leads to a significant cost increase.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a rotating electric machine capable of significantly improving the T / N characteristic value with a simple structure.

[0014]

In order to achieve the above object, the present invention provides an armature in which coils of a plurality of phases are wound around an iron core, and a relative rotation about a predetermined rotation axis with respect to the armature. In a rotary electric machine having a field magnet rotatably arranged, the field magnet is magnetized in a direction orthogonal to the circumferential direction, and both ends of the field magnet are magnetized. An annular yoke plate extending along the magnetized end face of the field magnet is attached to each of the surfaces, and a plurality of magnetic plates arranged at a predetermined pitch in the circumferential direction are attached to both of the yoke plates. A magnetic path forming convex portion is provided, and the iron core and the magnetic path forming convex portion are close to and away from each other so as to focus the magnetic flux of the field magnet on the iron core, and the magnetic flux passing through the iron core. Direction of the magnetic path forming convex with the relative movement of the armature and the field magnet. Together provided a positional relationship is inverted every arrangement pitch, salient poles each other corresponding to the different phases of the iron core, and a deployed configuration in a positional relationship of a magnetic circuit parallel.

[0015]

In the means having such a structure, the shape of the yoke plate attached to the field magnet allows the magnet to have a large number of poles due to the structure in which the total magnetic flux of the magnet is concentrated without being dispersed. Both the number of magnetic poles and the effective magnetic flux are increased at the same time without performing the pole magnetization and easily maintaining the structure on the armature side.

Further, in the present invention, since the salient poles corresponding to different phases of the iron core are magnetically connected in parallel,
Each phase forms a magnetic circuit in parallel and concentrates the effective magnetic flux, thus simplifying the structure.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, a first embodiment shown in FIGS. 1 and 2 is one in which the present invention is applied to a two-phase motor, and a hollow cylindrical bearing provided in the center of a casing (not shown). A rotary shaft 22 is rotatably supported in the shaft 21. A pair of iron cores 23, 23 forming an armature are fixed to the outer peripheral portion of the bearing 21, and a two-phase coil 2 is provided for each of the iron cores 23, 23.
4 and 24 are wound respectively. Each iron core 23
Is formed by laminating directional electromagnetic steel plates and the like to a predetermined thickness, and has two salient poles 23a, 23b extending in the radial direction.
And the two salient poles 23a and 23b are provided at a predetermined pitch in the circumferential direction.
Each coil 24 is wound around the body portion between the salient poles 23a and 23b for excitation.

On the other hand, in the bearing protruding portion of the rotary shaft 22,
The rotating disc 25 is fixed so as to rotate integrally, and a field magnet 27 is fixed to the outer peripheral portion of the rotating disc 25 via a yoke plate 26. The field magnet 27 is
The salient poles 23a, 23b of the armature are each formed of a hollow cylindrical body that surrounds the outer circumference of the salient poles 23a, 23b in an annular shape with a predetermined gap therebetween, and is configured to rotate around the fixed armature. That is, the iron core 23 and the coil 24 that form the armature are arranged to face each other on the inner peripheral side of the field magnet 27. A ferrite or rare earth magnet is used as the field magnet 27, and the magnet is magnetized in a direction (axial direction) orthogonal to the circumferential direction, which is the extending direction of the magnet. In this embodiment, the upper end surface of FIG. 1 of the field magnet 27 is magnetized to the N pole and the lower end surface of FIG. 1 is magnetized to the S pole.

The yoke plate 26 is attached to the magnetized end surface of the field magnet 27 on the upper side in the drawing, and
A yoke plate 28 is provided on the magnetized end surface of the field magnet 27 on the lower side in FIG.
Is attached. Each of these yoke plates 26, 28
Is made of a ring-shaped ferromagnetic material extending along each magnetized end face of the field magnet 27, and the yoke plate 26 attached to the N pole side of the field magnet 27 on the upper side of FIG. 1 is magnetized to the N pole. In addition, the yoke plate 28 attached to the S pole side of the field magnet 27 on the lower side in the drawing is magnetized to the S pole.

On the inner peripheral edge of the one yoke plate 26,
Eight magnetic path forming protrusions 26 protruding toward the axial center
, 26h are provided, and at the inner peripheral edge of the other yoke plate 28, eight magnetic path forming projections 28a, 28b, which project toward the axial center, are formed.
28c, ..., 28h are provided. The magnetic path forming protrusions 26a of the yoke plate 26, ... And the magnetic path forming protrusions 28a of the yoke plate 28 are the core 2 of the armature.
It is configured to rotate while sandwiching 3 from the axial direction. That is, the magnetic path forming projections 26a, ... And 28a, of the yoke plates 26 and 28, and the iron core 23 of the armature.
Are arranged so as to come close to or apart from each other as the two move relative to each other. When the two come close to each other so as to face each other in the axial direction, the magnetic flux from the field magnet 27 causes the yoke plates 26 to move.
, And 28a, ... through the magnetic path forming protrusions 26a ,. At this time, the plate thickness of the magnetic path forming convex portions 26a, ... And 28a, ... And the facing length with the iron core 23 are set to be substantially the same as the thickness of the iron core 23.

.. and 28a, ... on the two yoke plates 26 and 28 are arranged side by side at a predetermined pitch in the circumferential direction, and the magnetic path forming protrusions on one side are arranged. 26a, ... and the magnetic path forming protrusions 28a ,.
And are offset from each other by a half pitch in the circumferential direction. That is, in plan view, the magnetic path forming convex portions 26a, ... Which are magnetized to the N pole and the magnetic path forming convex portions 28a, which are magnetized to the S pole are alternately arranged at a constant pitch interval in the circumferential direction. The magnetic path forming protrusions 26 are arranged in an annular shape and are formed on one side.
a, the magnetic path forming convex portion 28a on the other side, the magnetic path forming convex portion 26b on the one side, and the magnetic path forming convex portion 28b on the other side are alternately arranged in this order. Thus, a total of 16 magnetic poles are configured without performing multipolar magnetization. Therefore, the direction of the magnetic flux passing through the portion of each iron core 23 to which the coil 24 is attached is such that the magnetic path forming protrusions 26a on both sides are
The arrangement relationship is such that 28a, ... Are reversed at every arrangement pitch. Although the iron cores 23, 23 correspond to mutually different phases, the salient poles 23a, 23b in one iron core 23 and the salient poles 23 in the other iron core 23 are also arranged.
The a and 23b are arranged in a positional relationship that constitutes a parallel magnetic circuit.

In the motor of such an embodiment, when the armature side and the field magnet side have the positional relationship shown in the figure,
That is, the magnetic path forming convex portion 26a of one yoke plate 26 is formed.
(N pole) is one salient pole 23a in one iron core 23
To the magnetic path forming convex portion 2 of the other yoke plate 28
When 8f (S pole) is close to the other salient pole 23b, the total magnetic flux from the field magnet 27 is focused on the iron core 23 through the magnetic path forming protrusions 26a and 28b as shown by the arrow in the figure. .

At this time, one iron core 2 corresponding to different phases
3 salient poles 23a and 23b and the other salient pole 23 of the iron core 23
Since a and 23b are connected in parallel as a magnetic circuit, each phase concentrates the effective magnetic flux in parallel. Therefore, the structure such as the shape of the iron core and the shape in which the salient poles and the magnetic poles face each other can be simplified, the cross-sectional area of the magnetic path forming portion can be reduced, and the saturation state of the magnetic flux can be avoided by dispersing the total magnetic flux. be able to. In addition, there is an advantage that vibration and the like can be balanced. The operation and effect of forming such a parallel magnetic circuit is particularly remarkable in the case of two-phase or three-phase as in the above embodiment.

Next, when the field magnet side is rotated and moved by the arrangement pitch of the magnetic path forming convex portions from this state, for example, the magnetic path forming convex portion 28a (S pole) of the yoke plate 28 is salient pole 2.
3a and the magnetic path forming convex portion 26g (N pole) of the yoke plate 26 are close to the salient pole 23b. Therefore, the total magnetic flux from the field magnet 27 is inverted to the side opposite to the direction of the arrow and focused on the iron core 23. Even when the magnetic flux is reversed in this way, parallel magnetic circuits are formed as in the case described above, so that each phase separately concentrates the effective magnetic flux.

As described above, in the present embodiment, due to the shape of the pair of yoke plates 26 and 28 attached to the field magnet 27, the total magnetic flux of the field magnet 27 is concentrated without being dispersed to achieve multi-pole. As a result, the magnetic flux from the field magnet 27 is always utilized to the maximum extent, and both the magnetic pole number P and the effective magnetic flux Φ are simultaneously increased. In order to make the poles multi-pole, the field magnet is not multi-pole magnetized as in the prior art, and the structure on the armature side is simply maintained.

In this state, the total magnetic flux concentration state is the same as in the rotary electric machine of the so-called 2-3 structure shown in FIGS. 11 and 12, and the number P of magnetic poles is increased. As shown in the above equation, the number P of magnetic poles contributes to the T / N characteristic value as a square. Therefore, if the number P of magnetic poles is tripled, the T / N characteristic value becomes 9 times. P is 4
If it is doubled, the T / N characteristic value is 16 times, and if the magnetic pole number P is 5 times, the T / N characteristic value is 25 times. As in this embodiment, the magnetic pole number P is 8.
If it is twice, the T / N characteristic value is 64 times, and the T / N characteristic value is greatly improved.

Here, the torque generated by the rotary electric machine is a change (dΦ / d) per unit angle θ of the magnetic flux Φ passing through the coil.
θ; the gradient of the magnetic flux density), and the T / N characteristic value is proportional to its square. Therefore, the change of the magnetic flux Φ during one rotation of the rotating electric machine is changed by the conventional two-pole motor (P
= 2), the conventional multi-pole motor (P = 10) and the motor according to the present invention (P = 10) will be compared.

As is clear from FIG. 3, the large magnetic flux changes slowly in the conventional two-pole motor () indicated by the broken line, and the magnetic flux Φ in the conventional multi-pole motor () indicated by the thick line. Is 5 times as many. However, since the magnetic flux Φ itself is ⅕, the change dΦ / dθ (magnitude of inclination) of the magnetic flux Φ is the same in both cases. On the other hand, in the case of the structure () of the present invention shown by the thin line, the same total magnetic flux as that of the conventional two-pole motor () is concentrated and the same interval as that of the conventional multi-pole motor (). Is being switched in. Therefore, the change dΦ / dθ (magnitude of inclination) of the magnetic flux Φ is extremely large. In this case, assuming that the conditions of the armatures of the respective motors are the same, the motor of the present invention has a generated torque (torque constant) of 5 times and T / N as compared with the conventional motor.
The characteristic value becomes 25 times.

In addition, in the embodiment shown in FIG.
Also, regarding the components corresponding to the embodiment of FIG. 2, the tens code “2” is replaced with “5”. In this embodiment, three iron cores 53, 53, 53 corresponding to different phases are used.
Are provided separately in the circumferential direction, and the iron cores 53 are arranged in a positional relationship that constitutes a parallel magnetic circuit. Each of the iron cores 53 has two salient poles 53.
a and 53b are provided. The other structures are the same, and detailed description thereof will be omitted.

Further, in the embodiment shown in FIG. 5, the components corresponding to the embodiments of FIGS. 1 and 2 are represented by replacing the tens code "2" with "6". In this embodiment, the two iron cores 6 forming the armature are used.
3, 63 are arranged to face a predetermined region on the outer peripheral side of the field magnet 66. The two iron cores 63, 63 are spaced apart from each other by a predetermined distance so as to form a parallel magnetic circuit.
The other structures are the same, and detailed description thereof will be omitted.

Furthermore, in the embodiment shown in FIG. 6, the reference numeral "2" in the tens place is replaced with "7" in the structure corresponding to the first embodiment shown in FIGS. 1 and 2. It represents. The salient poles 73a, 7 of the iron core 73 in this embodiment
3b is the field magnet 7 from the main body body around which the coil 74 is wound.
After protruding almost parallel to 7, it is bent almost at a right angle,
These salient poles 73a and 73b are the magnetic path forming projections 76a on both end edges of the yoke plate 76 magnetized to the N pole, and the magnetic paths on both end edges of the yoke plate 78 magnetized to the S pole. .. are arranged in proximity to the forming projections 78a from the outside (upper and lower sides in the drawing). The other structures are the same, and detailed description thereof will be omitted.

Further, in the embodiment shown in FIG. 7, the sign "2" in the tens place is replaced by "8" in the components corresponding to the first embodiment in FIGS. 1 and 2 described above. ing.
The salient poles 83a and 83b of the iron core 83 in this embodiment are
The coil 84 projects from the main body body around which the coil 84 is wound toward the field magnet 87 side, and the salient poles 83a and 83b of these coils are provided.
Are arranged in proximity to the magnetic path forming projections 88a provided on both end portions of the yoke plate 88 magnetized to the S pole. Further, the magnetic path forming convex portions 86a, ... Provided at both end portions of the yoke plate 86 magnetized to the N pole are the core 83
The salient poles 83a and 83b are closely arranged so as to cover them from the outside. Other structures are the same,
Detailed description is omitted.

Further, the embodiment shown in FIG. 8 shows the structure corresponding to the first embodiment of FIGS. 1 and 2 by replacing the tens code "2" with "9". In this embodiment, a yoke plate 96 and a yoke plate 98 are attached to each magnetized end surface of the field magnet 97. A large number of magnetic path forming projections 96a, ... And 98a, ... Protruding so as to be close to the salient poles 23a, 23b of the iron core 93 are provided on both side edges of the yoke plates 96, 98, respectively. .. and 98a .. in these yoke plates 96 and 98, so that the salient poles of the iron core 93 of the armature are sandwiched from the outside in the vertical direction in the figure. And are closely arranged at a predetermined pitch. The other structures are the same, and detailed description thereof will be omitted.

Next, in the embodiment shown in FIG. 9, for the components corresponding to the first embodiment of FIGS. 1 and 2 described above, the tens code "2" is replaced with "10". It represents. The salient poles 103a, 1 of the iron core 103 in this embodiment
03b is bent substantially at a right angle after protruding substantially parallel to the field magnet 107 from the main body body around which the coil 104 is wound. The salient poles 103a and 103b are yokes magnetized to the N pole. The magnetic path forming convex portions 106a at both end edges of the plate 106 and the magnetic path forming convex portions 108a at both end edge portions of the yoke plate 108 magnetized to the S pole are faced in the protruding direction, respectively. Are placed close together. The other structures are the same, and detailed description thereof will be omitted.

As described above, the present invention can employ armatures and field magnets of various shapes, and can obtain similar actions and effects. Further, the armature and the field magnet in each of the above-described embodiments can be arbitrarily set on the fixed side and the rotating side, and on the inner peripheral side and the outer peripheral side.

[0036]

As described above, according to the present invention, due to the shape of the yoke plate attached to the field magnet, the total magnetic flux of the field magnet is concentrated on the iron core side of the armature so as to be repeatedly inverted, and Since it is a multi-pole with a structure that concentrates the total magnetic flux without dispersing it, there is no need to perform multi-pole magnetization on the field magnet as in the past, and while maintaining the structure on the armature side easily. Both the number of magnetic poles and the effective magnetic flux can be simultaneously increased by always maximally utilizing the magnetic flux from the field magnet, and the T / N characteristic value can be greatly improved with a simple structure.

In particular, in the present invention, salient poles corresponding to different phases of the iron core are arranged in a positional relationship that forms a parallel magnetic circuit, and effective magnetic flux is concentrated while forming parallel magnetic circuits for each phase. Therefore, the structure can be simplified and the configuration can be simplified.

[Brief description of drawings]

FIG. 1 is an explanatory plan view showing a rotary electric machine according to a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional explanatory view showing the structure of the rotary electric machine shown in FIG.

FIG. 3 is a diagram comparing changes in magnetic flux Φ during one rotation of the rotating electric machine.

FIG. 4 is an explanatory plan view showing a rotary electric machine according to a second embodiment of the present invention.

FIG. 5 is an explanatory plan view showing a rotary electric machine according to a third embodiment of the present invention.

FIG. 6 is a partial cross-sectional explanatory view showing a rotary electric machine according to a fourth embodiment of the present invention.

FIG. 7 is a partial lateral cross-sectional explanatory view showing a main part of a rotary electric machine according to a fifth embodiment of the present invention.

FIG. 8 is a partial lateral cross-sectional explanatory view showing a main part of a rotary electric machine according to a sixth embodiment of the present invention.

FIG. 9 is a partial transverse cross-sectional explanatory view showing a main part of a rotary electric machine according to a seventh embodiment of the present invention.

FIG. 10 is an explanatory plan view showing an example of a conventional rotary electric machine.

11 is a vertical cross-sectional explanatory view showing the structure of the rotary electric machine shown in FIG.

FIG. 12 is an explanatory plan view showing another example of a conventional rotary electric machine.

[Explanation of symbols]

23, 53, 63, 73, 83, 93, 103 Iron core 24, 54, 64, 74, 84, 94, 104 Coil 26, 56, 66, 76, 86, 96, 106 Yoke plate 28, 58, 68, 78 , 88, 98, 108 Yoke plate 27, 57, 67, 77, 87, 97, 107 Field magnets 26a, 26b, 26c, 28a, 28b, 28c Magnetic path forming projections 56a to 56h, 58a to 58h Magnetic path Convex portion for forming 66a to 56i, 68a to 68i Convex portion for forming magnetic path 76a, 76b, 78a, 78b Convex portion for forming magnetic path 86a, 86b, 88a, 88b Convex portion for forming magnetic path 96a, 96b, 98a, 98b Magnetic path forming projections 106a, 106b, 108a, 108b Magnetic path forming projections

Claims (3)

[Claims] 1. An armature in which coils of a plurality of phases are wound around an iron core having salient poles, and a field magnet arranged so as to be rotatable relative to the armature about a predetermined rotation axis. When,
In the rotating electrical machine having the above-mentioned field magnet, the field magnet is magnetized in a direction orthogonal to the circumferential direction, and the both end surfaces of the field magnet are magnetized. An annular yoke plate extending along the end face is attached to each of the yoke plates, and a plurality of magnetic path forming protrusions arranged at a predetermined pitch in the circumferential direction are provided on both of the yoke plates. The iron core and the convex portion for forming a magnetic path are close to and away from each other so as to focus the magnetic flux of the field magnet on the iron core, and the direction of the magnetic flux passing through the iron core is that of the armature and the field magnet. Along with the relative movement, the salient poles corresponding to different phases of the iron core are provided in a positional relationship that is reversed at each pitch of the magnetic path forming convex portions, and the salient poles that correspond to the phases of the iron core have a positional relationship that constitutes a parallel magnetic circuit. A rotating electric machine characterized by being arranged. 2. The rotary electric machine according to claim 1, wherein the number of phases of the coil is three. 3. The rotating electric machine according to claim 1, wherein the number of phases of the coil is two.