JPH06217517A - Rotary electric machine - Google Patents

Abstract

PURPOSE:To remarkably improve the T/N characteristic value of a rotary electric machine with a simple structure. CONSTITUTION:To always utilize magnetic fluxes from field magnets 27 and make both the number of magnetic poles and effective magnetic fluxes of the magnets 27 simultaneously increasable while the structure of armatures is maintained simple without magnetizing the magnets 27 in such multiple poles as in the conventional example by inversionally concentrating the all magnetic fluxes from the magnets 27 on the iron core 23 sides of armatures 24 and 24 by utilizing the shapes of yoke plates 26 and 28 fitted to the magnets 27 and forming multiple poles in the magnets 27 with such a structure that does not disperse all magnetic fluxes of the magnet 27, but concentrates. In addition, by arranging the armatures 24 and 24 on the inner peripheral side of field magnets 27, 26, and 28 so that a space in the diametral space can be effectively utilized.

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 including 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 conventional proposals relating to rotating electrical machine technology can be said to be studies for eventually improving the T / N characteristic value. 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. The convex portion for path formation is provided, the armature is arranged to face the inner peripheral side of the field magnet and the yoke plate, and the iron core and the convex portion for magnetic path formation,
Close to each other so that the magnetic flux of the field magnet is focused on the iron core.
A configuration is provided in which the direction of the magnetic flux that is separated and that passes through the iron core is reversed at each pitch of the magnetic path forming convex portions with the relative movement of the armature and the field magnet. is doing.

[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.

Particularly, in the present invention, since the armature is arranged so as to face the inner circumference of the field magnet and the yoke plate, the space in the radial direction is effectively used.

[0017]

Embodiments of the present invention will now be described in detail with reference to the drawings. First, the first embodiment shown in FIGS. 1 and 2 is a three-phase motor to which the present invention is applied.
A rotary shaft 22 is rotatably supported in a hollow cylindrical bearing 21 provided at the center of a casing (not shown). An iron core 23 constituting an armature is fixed to the outer peripheral portion of the bearing 21, and the iron core 23
On the other hand, the three-phase coil 24 is wound. Above iron core 2
3 is formed by laminating silicon steel plate or the like to a predetermined thickness, and is formed by three salient poles 23a, 23b, 23 extending radially.
c are provided at a pitch interval of 120 ° in the circumferential direction around the rotation axis. The coil 24 has a salient pole 23.
It is wound around the middle of a, 23b, and 23c 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, 23c of the armature are formed of a hollow cylindrical body that surrounds the outer circumference of the salient poles 23a, 23b, 23c in an annular shape with a predetermined gap, and is configured to rotate around the fixed armature. There is. 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 the field magnet 27 in the figure is magnetized to the N pole, and the lower end surface in the figure is S.
It is magnetized to the 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 the drawing.
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 on the upper side of the field magnet 27 in the figure is magnetized to the N pole. In addition, the yoke plate 28 attached to the S pole side below the field magnet 27 in the figure is magnetized to the S pole.

On the inner peripheral edge of the one yoke plate 26,
Four magnetic path forming protrusions 26 protruding toward the axial center
a, 26b, 26c, 26d are provided, and four magnetic path forming protrusions 28a, 28b, 2 protruding toward the axial center are provided on the inner peripheral edge of the other yoke plate 28.
8c and 28d are provided. The magnetic path forming convex portions 26a of the yoke plate 26, and the magnetic path forming convex portions 28a of the yoke plate 28 are configured to rotate while sandwiching the iron core 23 of the armature from the axial direction. ing. 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
It is designed to approach and separate with the relative movement of the two, and when the two approach each other so as to face each other in the axial direction,
The magnetic flux from the field magnet 27 is applied to the yoke plates 26 and 2 described above.
, And 28a, through the magnetic path forming convex portions 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 pitch of 90.degree. In the circumferential direction, and the magnetic path forming protrusions on one side are formed. , And the magnetic path forming protrusions 28a on the other side,
Are arranged so as to be offset from each other by 45 ° 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 pitch interval of 45 ° in the circumferential direction. The magnetic path forming convex portion 26a on one side, 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. Therefore, the iron core 23
Direction of the magnetic flux passing through the part where the coil 24 of
The magnetic path forming convex portions 26a and 28a on both sides are arranged to be reversed at every arrangement pitch (45 °).

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 close to one salient pole 23a, and a pair of magnetic path forming projections 28b, 28c on the other yoke plate 28 are formed.
When the (S pole) is close to the other salient poles 23b and 23c, the total magnetic flux from the field magnet 27 is as shown by the arrow in the figure.
It is focused on the iron core 23 through the magnetic path forming projections 26a, 28b, 28c.

Next, when the field magnet side is rotated and moved by 45 ° which is the arrangement pitch of the magnetic path forming convex portions from this state, the magnetic path forming convex portion 28a (S pole) of the yoke plate 28 is salient. 23a and a pair of magnetic path forming projections 26c and 26d (N pole) on the yoke plate 26 are formed on the salient pole 23.
Close to b and 23c. 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.

As described above, in this 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 remains 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. As in the example, if the number of magnetic poles P is 4 times, the T / N characteristic value is 16 times, and if the number of magnetic poles P is 5 times, the T / N characteristic value is 25 times.
The / N characteristic value is significantly improved.

Here, the torque generated by the rotating 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 apparent 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 the embodiment shown in FIG. 4, the components corresponding to the embodiments of FIGS. 1 and 2 described above are
The tens code "2" is replaced with "4". In this embodiment, a large number of magnetic path forming projections 46a to 46h and 48a to 48h are provided on each of the yoke plates 46 and 48 so as to have more poles than in the above embodiment, and the iron core 43 Each salient pole 43a, 43b, 43c
Is divided into two forks. If the tip of the salient pole is bifurcated in this manner, the load on the yoke plate can be reduced.

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 sign "2" with "5". In this embodiment, the magnetic path forming projections of the yoke plates 56 and 58 are increased in number as shown by reference numerals 56a to 56h and 58a to 58h to make them multi-pole, and the number of salient poles of the iron core 53 is set to 53.
It is increased like a to 53f.

Furthermore, in the embodiment shown in FIG. 6, the structure corresponding to the above-mentioned first embodiment is
The tens place "2" in the reference numeral is shown in place of the reference numeral "6". In the present embodiment, the magnetic path forming projections 66a and 68a provided on the two yoke plates 66 and 68 face the circumferential end surface of the iron core 63 on the armature side and are substantially L-shaped in the axial direction.
It is bent in a letter shape.

Next, the embodiment shown in FIG. 7 is one in which the present invention is applied to a two-phase motor, and regarding the structure corresponding to the first embodiment, the tenth digit "" in the reference numeral. 2 "is replaced with the reference numeral" 7 ". The armature in this embodiment has a pair of iron cores 73, 73, and salient poles 73a, 73b provided at both ends of one iron core 73 and salient poles provided at both ends of the other iron core 73. 73c, 73d
Are the magnetic path forming projections 76a to 7 of the yoke plates 76 and 78.
6h and 78a to 78h are arranged so as to approach and separate from each other.

Further, in the embodiment shown in FIG.
Also, the constituent corresponding to the first embodiment of FIG. 2 is represented by replacing the tens code “2” with “8”. In this embodiment, the magnetic path forming protrusions of the yoke plates 86 and 88 are
The number of salient poles of the iron core 53 is three salient poles 83a, 83b, 83 as in the first embodiment, although the number of salient poles of the iron core 53 is increased like reference numerals 86a to 88h and 88a to 88h.
It is limited to c.

Further, the embodiment shown in FIG. 9 is one in which the present invention is applied to a three-phase brushless motor.
Also, the constituent corresponding to the first embodiment of FIG. 2 is represented by replacing the tens code “2” with “9”. In the present embodiment, a rotating shaft 92 is rotatably supported in a hollow cylindrical bearing holder 91 that is erected in the center of the substrate 90, and the armature is attached to the outer peripheral portion of the bearing holder 91. The iron core 93 is fixed so as to form a stator. The salient poles 93a provided on the iron core 93 are arranged at a predetermined pitch in the circumferential direction.

On the other hand, a case 95 made of a dish-shaped non-magnetic member is provided on the lower surface portion of the cylindrical rotary member 95 fixed to the bearing projecting portion of the rotary shaft 92 so as to constitute the rotor, as shown in the figure.
a is concentrically attached, and a field magnet 97 is annularly fixed to an inner peripheral wall portion of a flange portion provided on the outer peripheral portion of the case 95a. This field magnet 97
Is composed of a hollow cylindrical body surrounding the outer peripheral side of each salient pole 93a of the armature in an annular shape with a predetermined gap, and is configured to rotate around the armature in a fixed state. There is. Further, the field magnet 97 is magnetized in a direction (axial direction) orthogonal to the circumferential direction which is the extending direction, and the magnetized end faces of the field magnet 97 on the upper side and the lower side in the drawing, respectively. A ring plate-shaped yoke plate 96 and a yoke plate 98 are attached to each.

Magnetic path forming projections 96 projecting from the inner peripheral edges of the yoke plates 96 and 98, respectively.
.. and 98a, ... have the same structure as in the first embodiment described above, and the magnetic path forming convex portions 96a, .. The magnetic path forming convex portions 98a, ... Are alternately arranged annularly at a predetermined pitch in the circumferential direction. Therefore, the direction of the magnetic flux passing through the portion of the iron core 93 on which the coil 94 is attached is reversed at every arrangement pitch of the magnetic path forming convex portions 96a, 98a ,. The above-mentioned substrate 9
The lead wire extending from 0 is connected to a drive control circuit 99 provided outside the motor.

Furthermore, the embodiment shown in FIG.
The present invention is applied to a small-phase brushed motor, and in the components corresponding to the first embodiment of FIGS. 1 and 2, the tens code “2” is replaced with “10”. ing. In the present embodiment, the bearings 101, 101 are provided so as to face each other at the center of both axial end faces of the casing 100 made of a non-magnetic material in the shape of a hollow cylinder, and both bearings 101, 101 are provided. Between 101, the rotating shaft 102
Is rotatably supported. This rotary shaft 102 has
The iron core 103 of the armature that constitutes the rotor is fixed, and a three-phase coil 104 is attached to the iron core 103.
Is wound. The plurality of salient poles 103a provided on the iron core 103 are arranged at a predetermined pitch in the circumferential direction.

A field magnet 107 is annularly fixed to the inner peripheral wall of the body of the casing 100 so as to form a stator. The field magnet 107 is composed of a hollow cylindrical body that surrounds the salient poles 103a, ... Of the armature in a rotating state on the outer peripheral side in an annular shape with a predetermined gap in the extending direction. Magnetization is performed in a direction (axial direction) orthogonal to the circumferential direction. And this field magnet 10
A ring plate-shaped yoke plate 106 and a yoke plate 108 are attached to the respective magnetized end faces on the upper side and lower side in the figure in FIG.

The magnetic path forming projections 1 projecting from the inner peripheral edges of the yoke plates 106 and 108, respectively.
.. and 108a, ... have the same structure as in the first embodiment described above, and the magnetic path forming convex portions 106a, .. The magnetic path forming protrusions 108a, ... Are alternately arranged in an annular shape at a predetermined pitch in the circumferential direction. Therefore, the iron core 1
03, the direction of the magnetic flux passing through the portion where the coil 104 is mounted is such that the magnetic path forming protrusions 106a, 108a,
The arrangement relationship is such that the arrangement pitch is reversed at every arrangement pitch.

Further, a commutator 110 corresponding to three-phase power supply currents is annularly attached to the rotary shaft 102. On the other hand, on the casing 100 side, a brush 111 contacting the commutator 110 side is fixed so as to correspond to the three-phase power supply current. A three-phase current is supplied to the coil 104 of the armature through the brush 111 and the commutator 110.

As described above, in the present invention, armatures and field magnets of various shapes can be adopted, and similar actions and effects can be obtained. 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.

[0041]

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, since the armature side is arranged to face the inner circumference side of the field magnet side, the space in the radial direction can be effectively utilized, and the size can be further reduced.

[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 semi-longitudinal sectional view showing a rotary electric machine according to a fourth embodiment of the present invention.

FIG. 7 is an explanatory plan view showing a rotary electric machine according to a fifth embodiment of the present invention.

FIG. 8 is an explanatory plan view showing a rotary electric machine according to a sixth embodiment of the present invention.

FIG. 9 is an explanatory plan view showing a rotary electric machine according to a seventh embodiment of the present invention.

FIG. 10 is an explanatory plan view showing a rotary electric machine according to an eighth embodiment of the present invention.

FIG. 11 is an explanatory plan view showing an example of a conventional rotary electric machine.

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

FIG. 13 is an explanatory plan view showing another example of a conventional rotary electric machine.

[Explanation of symbols]

23, 43, 53, 63, 73, 83, 93, 103
Iron core 24,44,54,64,74,84,94,104
Coils 26, 46, 56, 66, 76, 86, 96, 106
Yoke plate 28, 48, 58, 68, 78, 88, 98, 108
Yoke plate 27, 47, 57, 67, 77, 87, 97, 107
Field magnets 26a, 26b, 26c, 28a, 28b, 28c Magnetic path forming projections 46a to 46h, 48a to 48h Magnetic path forming projections 56a to 56h, 58a to 58h Magnetic path forming projections 66a to 66h, 68a to 68h Magnetic path forming convex portions 76a to 76h, 78a to 78h Magnetic path forming convex portions 86a to 86h, 88a to 88h Magnetic path forming convex portions 96a, ..., 98a, ... Magnetic path forming convex portion 106a, ..., 108a, ... Magnetic path forming protrusions

Claims (3)

[Claims] 1. An armature in which coils of a plurality of phases are wound around an iron core, and a field magnet arranged so as to be rotatable relative to the armature about a predetermined rotation axis. In a rotating electric machine, the field magnet is magnetized in a direction orthogonal to the circumferential direction, and the magnetized end faces of the field magnet are respectively attached to both magnetized end faces of the field magnet. An annular yoke plate extending along each of the yoke plates is attached to each of the yoke plates, and a plurality of magnetic path forming convex portions arranged at a predetermined pitch in the circumferential direction are provided on both of the yoke plates. Are arranged so as to face each other on the inner peripheral side of the field magnet and the yoke plate, 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 direction of the magnetic flux passing through the iron core is different between the armature and the field magnet. Rotating electric machine, characterized in that provided in the positional relationship is inverted every arrangement pitch of the magnetic path forming convex part along with the relative movement. 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.