JP2003153471A - Motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight of a motor by reducing the quantity of iron while maintaining the characteristics and taking into account windability. SOLUTION: The motor comprises a stator 2 obtained by applying windings 7 and 8 to the salient pole parts 3 and 4 of the stator core comprising the salient pole parts 3 and 4 and yoke parts 5 and 6 linking the root parts thereof, and a rotor 1 held rotatably on the inner circumference of the stator 2 while facing the salient pole parts 3 and 4 wherein the yoke part has a part proximate to the rotor than the yoke part at the root of the salient pole and the widths 5b and 6b of the yoke parts 5 and 6 on the forward side in the rotational direction of the proximate part are wider than he widths 5a and 6a of the yoke parts 5 and 6 on the rearward side in the rotational direction of the proximate part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor used for a moving body such as an electric vacuum cleaner, which is required to be small and lightweight and highly efficient.

[0002]

2. Description of the Related Art Conventionally, the winding field type electric motor with a commutator used in an electric blower has a substantially constant width of the yoke portion. However, due to the armature reaction and the presence of leakage magnetic flux from the yoke portion to the rotor, the amount of magnetic flux flowing through the yoke portion is not always uniform, and local magnetic saturation may occur.

An example of solving this problem is Japanese Patent Laid-Open No. 2000-2000.
It is disclosed in Japanese Patent Publication No.-92755 and will be described with reference to FIG.

The electric motor has a projecting stator core consisting of two salient pole portions 33, 34 projecting toward the inner peripheral side and yoke portions 35, 36 connecting the root portions of the salient pole portions 33, 34 to each other. The electric motor is composed of a stator 32 having windings 37 and 38 on its poles, and a rotor 31 rotatably held on the inner circumference of the stator so as to face the salient poles. The salient pole portions 33 and 34 are
Protrusions 33a, 33b, 34 that widen toward the inner peripheral side
The protrusions 33a, 34a on the reverse side in the rotation direction are wider than the protrusions 33b, 34b on the advance side in the rotation direction. Further, the width of the yoke portions 35b, 36b on the forward side in the rotation direction with respect to the root portions of the salient pole portions 33, 34 is equal to that of the yoke portion 3 on the reverse side in the rotation direction.
The winding storage space that is larger than the widths of 5a and 36a and is on the reverse side in the rotational direction with respect to the salient pole portions 33 and 34 is the protrusion portion 33.
Corresponding to the increased width of a and 34a, the yoke part 35
The winding side of a and 36a is the yoke portion 35 on the forward side in the rotation direction.
It is devised that the winding spaces on both sides of the salient pole portions 33, 34 become substantially the same by moving from the winding side of b, 36b to the outer peripheral side.

[0005]

However, even if the winding spaces on both sides of the salient pole portion are substantially the same, the shape of both side surfaces of the salient pole portion is the center axis of the salient pole portion or the salient pole portion. Since it is not symmetric with respect to any axis parallel to the center axis, winding is difficult and aligned winding is difficult, so the space factor of the winding is reduced, the torque is reduced, and the winding resistance is reduced. And the copper loss increases.

The present invention solves this problem, and an object of the present invention is to reduce the amount of iron in the iron core and reduce the weight while maintaining the characteristics while taking the winding property into consideration.

[0007]

In order to solve the above-mentioned problems, the present invention comprises a plurality of salient pole portions projecting inward and a yoke portion connecting the root portions of the salient pole portions to each other. An electric motor comprising a stator formed by winding a salient pole portion of a child iron core, and a rotor rotatably held on the inner circumference of the stator so as to face the salient pole portion. The yoke portion has a portion closer to the rotor (referred to as a proximity portion) than the yoke portion of the root portion, and the width of the yoke portion on the forward side in the rotation direction from the vicinity of the proximity portion is the proximity portion. It is characterized in that it is smaller than the width of the yoke section on the reverse side in the direction of rotation than in the vicinity. Further, when the winding is applied to the side surface of the salient pole portion and the winding portion surrounded by the yoke portion, at least both side surface shapes of the salient pole portion with respect to an arbitrary axis (called a symmetry axis) They are substantially symmetrical to each other.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The invention according to claim 1 of the present application is
A stator having a plurality of salient pole portions protruding toward the inner peripheral side, and a stator core formed by winding a salient pole portion of a stator core connecting the root portions of the salient pole portions to each other, and the stator. An electric motor comprising a rotor rotatably held on the inner periphery of the rotor facing the salient pole portion, where the yoke portion is closer to the rotor than the yoke portion at the root of the salient pole ( The width of the yoke section on the forward side in the rotation direction is larger than the width of the yoke section on the reverse side in the rotation direction than in the vicinity of the proximity section. It is a featured electric motor that responds to changes in the amount of magnetic flux due to leakage of the magnetic flux of the yoke part to the protrusions of the salient poles of the rotor or stator, and has a uniform magnetic flux without local magnetic saturation. By obtaining the density, high efficiency can be realized with the minimum material (iron).

In the invention according to claim 2 of the present application, the winding is
When applied to the side surface of the salient pole portion and the winding portion surrounded by the yoke portion, at least both side surface shapes of the salient pole portion are substantially symmetrical with respect to an arbitrary axis (referred to as an axis of symmetry), The electric motor according to claim 1, wherein the winding property is good, aligned winding is possible, and the efficiency can be improved by improving the winding space factor.

The invention according to claim 3 of the present application is the electric motor according to claim 1 or claim 2 in which the salient pole portions are provided at two positions symmetrical with respect to each other by 180 °, and the magnetic path length of the yoke portion is long, In the form in which the magnetic flux easily leaks, the advantages of the invention according to claim 1 or 2 can be utilized.

According to a fourth aspect of the present invention, the yoke portion of the stator has a substantially rectangular shape, and salient pole portions are provided from the substantially central portions of the two sides facing each other toward the inner peripheral side. 4. The electric motor according to claim 3, wherein the other two substantially facing central portions are close to each other, and the material of the stator core is well taken, and the used materials can be reduced. It is possible.

In the invention according to claim 5 of the present application, the shortest distance from the adjacent portion of the yoke portion to the rotor or the salient pole portion is smaller than the shortest distance between the salient pole portions facing each other. In the electric motor according to claim 4, in particular, since the amount of magnetic flux in the yoke portion is likely to change due to leakage, the advantages of the invention according to claim 3 or 4 can be utilized.

According to a sixth aspect of the present invention, the surface of the yoke portion on the winding side of the side having the salient pole portion is on the same plane on both sides of the salient pole portion. The electric motor according to claim 5, wherein the winding property is good. In particular, when winding is performed while swinging the winding nozzle, it is easy to control the nozzle, and high space factor winding is also possible.

In the invention according to claim 7 of the present application, the ends of the salient pole portions project toward both sides of the forward and reverse sides in the rotational direction so as to cover the rotor (referred to as projecting portions). 7. The electric motor according to any one of claims 1 to 6, wherein the width of the protrusion on the forward side is smaller than the width of the protrusion on the reverse side in the rotation direction. By setting the road width, high efficiency can be realized with the minimum material (iron).

The invention according to claim 8 of the present application is the electric motor according to claim 7, wherein the protrusion length of the protrusion on the forward side in the rotation direction is smaller than the protrusion length of the protrusion on the reverse side in the rotation direction. Therefore, by reducing the width of the protrusion on the forward side in the rotational direction, it is possible to prevent the tip of the protrusion from becoming too thin and the strength from decreasing.

The invention according to claim 9 of the present application is any one of claims 1 to 8 in which a through hole is provided in the vicinity of the inner peripheral portion of the salient pole portion on the forward side in the rotation direction from the salient pole center. In the electric motor according to the item 1, the weight of the electric motor can be reduced by providing a hole in a portion having a low magnetic flux density.

In the invention according to claim 10 of the present application, the through hole is an elongated hole inclined toward the forward side in the rotational direction from the inner peripheral portion of the salient pole portion toward the outer peripheral portion thereof. Since it is an elongated hole along the flow of magnetic flux, the weight of the electric motor can be reduced without obstructing the flow of magnetic flux.

According to an eleventh aspect of the present invention, the stator core is formed by winding at least two pieces on a side of the yoke portion where there is no salient pole portion. ,
The electric motor according to any one of claims 1 to 10, wherein the winding property is improved, and even if the shape of the winding housing portion is asymmetric on both sides of the salient pole portion, a high occupancy ratio is achieved. Product-factor winding is possible.

According to a twelfth aspect of the present invention, a rotor is provided with a rotor winding, and the rotor winding has a current rectified by a commutator by the same power source as the stator winding. The electric motor according to any one of claims 1 to 11, characterized in that the flowing direction of the magnetic flux is substantially constant. Therefore, the configuration as described above is particularly effective. Is.

The invention as set forth in claim 13 of the present application is a moving body which is equipped with the electric motor as set forth in any one of claims 1 to 12, and the weight of the electric motor can be reduced. Therefore, the burden on the person who uses (tows) the moving body is reduced.

[0021]

(Embodiment 1) A first embodiment of the present invention will be described with reference to FIGS.

The electric motor has a projecting stator core consisting of two salient pole portions 3 and 4 projecting toward the inner peripheral side and yoke portions 5 and 6 connecting the root portions of the salient pole portions 3 and 4 to each other. An electric motor comprising a stator 2 in which windings 7 and 8 are applied to the poles through an insulator 9 and a rotor 1 which is rotatably held inside the stator so as to face the salient poles. Is.

The salient pole portions 3 and 4 have projecting portions 3a, 3b, 4a and 4b which widen toward the inner peripheral side.
The salient poles have a continuously inclined shape from the root to the protrusions 3a, 3b, 4a, 4b, so that the flow of the magnetic flux is smooth, and the iron due to the sharp bending of the magnetic flux. The increase in loss is suppressed.

The yoke portions 5 and 6 have a substantially rectangular shape, and two salient pole portions 3 and 4 are provided at 180-degree symmetrical positions from the substantially central portions of the two sides facing each other toward the inner peripheral side and fixed. It has two poles. Further, the yoke portions 5 and 6 are close to the rotor 1 (referred to as proximity portions 5c and 6c) in the vicinity of the substantially central portion of the two sides having no salient pole portion, and the distance d3 is It is smaller than the distance between the end of 6 and the rotor. If the shortest distance between the tip portions of the salient pole portions facing each other is d1, then d1> d3. Further, at the positions slightly deviated from the vicinity of the central portion of the two sides of the yoke portions 5, 6 which do not have the salient pole portion, the salient pole portions 3a, 3b, 4a, 4b.
Is closest to, and its distance is d2, then d1> d2. However, the distance d2 may be different on the forward side and the reverse side of each salient pole portion.

The widths Wc and Wd of the yoke portions 5b and 6b on the forward side in the rotational direction with respect to the roots of the salient pole portions 3 and 4 are the widths Wa of the yoke portions 5a and 6a on the backward side in the rotational direction. It is larger than Wb. This difference in width is bounded by the vicinity of the adjacent portions 5c and 6c.

FIG. 3 was calculated by a simulation using the finite element method for the magnetic flux lines flowing in the electric motor at the time of load rotation in an electric motor in which the width of the yoke portion is the same on the forward side and the reverse side in the rotation direction. It is a thing. The magnetic flux flowing through the yoke is
At the position where the yoke portion is close to the protrusions 3a, 3b, 4a, 4b and the position close to the rotor 1, F1, F2, F
3 and F4 are leaking, and the magnetic flux flowing to the yoke portion is reduced at these positions. The width of the yoke portion may be reduced according to the decrease in the magnetic flux. However, due to the structure,
The yoke portion may partially have a wide portion that does not depend on the amount of magnetic flux, as in the vicinity of the adjacent portions 5c and 6c. For example, it may be a wide portion such as a bolt hole, a divided portion when the stator iron core is divided, a half-pulled position of the colored body, or the like.

Of the yoke portion, the side with the salient pole portion is
In some cases, the width of the yoke portion differs between the salient pole portion on the forward side and the reverse side in the rotational direction. At this time, considering the winding property, the winding side surfaces 5aw and 5b of the side of the yoke portion where the salient pole portion is present.
It is preferable that w, 6aw and 6bw are on the same plane. That is, among the yoke portions on the side having the salient pole portion, the yoke portion on the reverse side in the rotation direction has a width wider than that of the yoke portion on the advance side in the rotation direction by moving the outer peripheral surface to the inner peripheral side. It should be small. At this time, the windings 7 and 8 are the winding-side surfaces 5aw, 5bw, 6aw, 6 of the salient pole portions 3 and 4 and the side of the yoke portion having the salient pole portions.
Since it is housed in the part surrounded by bw, if the part shown by the bold line in FIG. 2 is symmetrical with respect to the axis of symmetry AB, aligned winding is possible, and the winding collapses during winding. This can prevent the space factor from decreasing. In particular, the winding side surfaces 5aw and 5bw of the side of the yoke portion where the salient pole portion is located,
When 6aw and 6bw are not on the same plane, when the winding is started with reference to the surfaces 5aw and 5bw, 6aw and 6bw, as one winding process progresses, the winding shifts to the outside. May be lost, or the wires may cross each other at the axial end of the winding.

The axis of symmetry AB is the central axis C of the rotor.
It may be different from -D.

The fact that the axis of symmetry AB and the center axis CD of the rotor are displaced by a certain distance means that the salient pole portions 3 and 4 are on the forward side in the rotational direction so as to cover the rotor 1. And the protruding portions 3a, 3b, 4 of the portions protruding to both sides on the reverse side
This is a case where the widths of a and 4b are not the same, which will be described later.

Regarding the method of making the width of the yoke portion unequal,
Although the steps are provided above, the steps may be more than two steps, and one side of the yoke may be inclined. Also,
If the width of the yoke portion itself is made equal and a through hole is provided in a portion where the width of the yoke portion is to be narrowed or a plurality of grooves or recesses are provided, the weight reduction effect of the stator core can be obtained.

Next, the width of the protrusions 3a, 3b, 4a, 4b will be described.

From the magnetic flux diagram of FIG. 3, the protrusions 3a, 4a on the reverse side in the rotational direction with respect to the salient poles 3, 4 have a higher magnetic flux than the protrusions 3b, 4b on the advance side. This is due to the armature reaction, and in the case of a motor that rectifies the current flowing in the rotor winding by the contact of the commutator and the brush,
The position of the brush can determine the degree of influence of the armature reaction. Therefore, the protrusions 3a, 4a on the reverse side in the rotational direction with respect to the salient poles 3, 4 are the protrusions 3 on the forward side.
The width can be made wider than that of b and 4b. On the contrary, since almost no magnetic flux flows through the forward protrusions 3b and 4b, the width may be narrowed. However, when the tips of the protrusions 3b and 4b are thinned to the extent that they have no strength, the protrusions 3b and 4 on the forward side are compared with the lengths of the protrusions 3a and 4a on the reverse side.
The length of b may be shortened. In this case, if the length of the protrusions 3b, 4b on the forward side is made too short, the winding housing space will be reduced, so care must be taken not to lose the symmetry of the winding shape.

The winding receiving space on the reverse side in the direction of rotation with respect to the salient pole portions 3 and 4 corresponds to the increased width of the protrusion portions 3a and 4a, and the winding side of the yoke portions 5a and 6a is By moving from the winding side of the yoke portions 5b and 6b on the forward side in the rotation direction to the outer peripheral side, the winding spaces on both sides of the salient pole portions 3 and 4 are devised so that they are substantially the same. ing.

Here, the rotor winding uses the same power source as the stator winding, and when the power source is alternating current, the stator winding current and the rotor winding current increase simultaneously. In particular, when the electric current has a peak, the yoke portion is often used in a state where it is magnetically saturated or in a state close to it. Therefore, the magnetic flux flowing in the yoke portion also leaks more easily.

Since this electric motor can be reduced in weight, it is suitable as an electric motor to be housed inside a device used while moving. It is possible to reduce the weight of the conventional stator core by 10% or more while maintaining the same characteristics.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS.

The electric motor has a projecting stator core consisting of two salient pole portions 13 and 14 projecting toward the inner peripheral side and yoke portions 15 and 16 connecting the root portions of the salient pole portions 13 and 14 to each other. An electric motor comprising a stator 12 having windings 17 and 18 provided on the poles via an insulator 22 and a rotor 11 rotatably held on the inner circumference of the stator so as to face the salient poles. Is. The salient pole portions 13 and 14 are the protrusions 1 that spread toward the inner peripheral side.
3a, 13b, 14a, 14b, and salient pole portions 13, 1
From the root of No. 4 the protrusions 13a, 13b, 14a, 14b
Toward, the salient pole portion has a continuously inclined shape.

The yoke portions 15 and 16 are formed in a substantially rectangular shape, and salient pole portions 13 and 14 are provided at two 180-degree symmetrical positions from the substantially central portions of the two sides facing each other toward the inner peripheral side and fixed. It has two poles. Further, the yoke portions 15 and 16 are
The rotor 1 is provided near the center of the two sides without the salient poles.
The distance d3 is smaller than the distance between the rotor and the end portions of the yoke portions 15 and 16 (the proximity portions 15c and 16c). If the shortest distance between the tip portions of the salient pole portions facing each other is d1, then d1> d3. Also,
At a position slightly deviated from the vicinity of the central portion of the two sides of the yoke portions 15, 16 having no salient pole portion, the salient pole portions are closest to the protrusion portions 13a, 13b, 14a, 14b, and their distances are If d2, then d1> d2. However, d2
The distance may be different on the forward side and the reverse side of each salient pole portion.

The widths Wc and Wd of the yoke portions 15b and 16b on the forward side in the rotational direction with respect to the root portions of the salient pole portions 13 and 14 are
Widths Wa, W of the yoke portions 15a, 16a on the reverse side in the rotation direction
It is larger than b. This difference in width is due to the proximity 15
The boundaries are c and 16c.

The side of the yoke that has the salient poles is
In some cases, the width of the yoke portion differs between the salient pole portion on the forward side and the reverse side in the rotational direction. At this time, considering the winding property, the winding side surfaces 15aw and 15 of the side of the yoke portion where the salient pole portion is present.
bw, 16aw and 16bw may be on the same plane. That is, of the yoke portions on the side having the salient pole portion, the yoke portion on the reverse side in the rotation direction is moved by moving the outer peripheral surface to the inner peripheral side.
The width may be smaller than the yoke portion on the forward side in the rotation direction.
At this time, the windings 17 and 18 include the salient pole portions 13 and 14 and the winding-side surfaces 15aw and 15 of the sides of the yoke portion having the salient pole portions.
Since it is housed in the portion surrounded by bw, 16aw, and 16bw, the portion indicated by the thick line in FIG. 5 is the axis of symmetry EF.
If it is symmetric with respect to, it is possible to perform an aligned winding, and it is possible to prevent a decrease in space factor due to collapse of winding during winding.

The axis of symmetry EF is the same as the central axis of the rotor.

Here, the protrusions 13a, 13b, 14a,
Since the widths of 14b are the same, it is possible to share the winding machine with an electric motor rotating in opposite directions or an electric motor rotating in both directions.

However, according to the magnetic flux diagram of FIG. 3, the protrusion 13 on the reverse side in the rotational direction with respect to the salient poles 13 and 14 is formed.
a and 14a are larger than the protrusions 13b and 14b on the forward side,
The magnetic flux is dense. This is the effect of the armature reaction, and in the case of an electric motor that rectifies the current flowing in the rotor winding by the contact of the commutator and the brush, depending on the position of the brush,
The degree of influence of armature reaction can be determined. Therefore, the protrusions 13a and 14a on the reverse side in the rotational direction with respect to the salient poles 13 and 14 need a width of the magnetic path as compared with the protrusions 13b and 14b on the advance side. On the contrary, the protrusion 13 on the forward side
Since almost no magnetic flux flows through b and 14b, by providing the through hole, it is possible to reduce the weight without deteriorating the characteristics. The through holes may be provided in the magnetic flux sparse areas of FIG. Of the salient pole portions 13 and 14 facing the rotor 11, the hole 20 may be provided on the forward side in the rotation direction.
Further, considering a case where a continuous hole is provided along the magnetic flux line, it is preferable to form a long hole 19 on the forward side in the rotation direction from the salient pole center near the inner peripheral portions of the salient pole portions 13 and 14. This elongated hole may be plural. In addition to this, holes may be further added to the portion where the magnetic flux is sparse.

The winding storage space on the reverse side in the direction of rotation with respect to the salient pole portions 13 and 14 corresponds to the width of the yoke portions 5a and 6a being reduced, and the winding space on the side of advance in the direction of rotation is accommodated. It may be wider. At this time, it is necessary to improve the space factor of the winding on the forward side in the rotation direction. In this case, the space factor can be improved by winding the split iron core 15p having the joint portion 21 at the portion of the yoke portion corresponding to the winding-accommodating space on the forward side in the rotation direction, and winding the split iron core 15p after that. Is. With this structure, it is possible to prevent the space of the winding nozzle from being limited by the side of the yoke portion on the side without the salient pole portion.

Here, the rotor winding uses the same power source as the stator winding, and when the power source is alternating current, the stator winding current and the rotor winding current increase at the same time. In particular, when the electric current has a peak, the yoke portion is often used in a state where it is magnetically saturated or in a state close to it. Therefore, the magnetic flux flowing in the yoke portion also leaks more easily.

Since this electric motor can be reduced in weight, it is suitable as an electric motor to be housed inside a device to be used while moving. For example, by incorporating it in an electric blower and mounting it on a moving body such as an electric vacuum cleaner, the same electric motor can be obtained. While maintaining the characteristics,
It is possible to reduce the weight of conventional electric motors by 10% or more.

[0047]

According to the invention described in claim 1 of the present application,
Corresponding to changes in the amount of magnetic flux due to leakage of the magnetic flux of the yoke part to the protrusions of the rotor or the salient poles of the stator, there is no local magnetic saturation and a uniform magnetic flux density is obtained to minimize the High efficiency can be realized with the material (iron).

According to the second aspect of the present invention, the winding property is good, the aligned winding is possible, and the winding space factor is improved, so that the efficiency can be improved.

According to the invention of claim 3 of the present application, in the form in which the magnetic path length of the yoke portion is long and the magnetic flux easily leaks,
The advantages of the invention according to claim 1 or claim 2 can be utilized.

According to the invention of claim 4 of the present application, the material of the stator core can be taken well, and the amount of material used can be reduced.

According to the invention of claim 5 of the present application, in particular, since the amount of magnetic flux in the yoke portion is apt to change due to leakage,
The advantages of the invention according to claim 3 or claim 4 can be utilized.

According to the invention of claim 6 of the present application, the winding property is excellent. In particular, when winding is performed while swinging the winding nozzle, it is easy to control the nozzle, and high space factor winding is also possible.

According to the invention of claim 7 of the present application, by setting the magnetic path width according to the amount of magnetic flux, it is possible to realize high efficiency with the minimum material (iron).

According to the invention of claim 8 of the present application, by reducing the width of the protrusion on the forward side in the rotational direction,
It is possible to prevent the tip of the protruding portion from becoming too thin and the strength from decreasing.

According to the invention of claim 9 of the present application, it is possible to reduce the weight of the electric motor by providing the hole in the portion where the magnetic flux density is low.

According to the invention of claim 10 of the present application,
Since it is an elongated hole along the flow of magnetic flux, the weight of the electric motor can be reduced without obstructing the flow of magnetic flux.

According to the invention of claim 11 of the present application,
The winding property is improved, and even if the shape of the winding housing portion is asymmetrical on both sides of the salient pole portion, a high space factor winding is possible.

According to the invention of claim 12 of the present application,
Since the direction in which the magnetic flux flows is substantially constant, the configuration as described above is particularly effective.

According to the invention of claim 13 of the present application,
Since the weight of the electric motor can be reduced, the burden on a person who uses (pulls) the moving body is reduced.

[Brief description of drawings]

FIG. 1 is a sectional view of an electric motor according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a stator core of an electric motor according to the first embodiment of the present invention.

FIG. 3 is a diagram showing the flow of magnetic flux.

FIG. 4 is a sectional view of an electric motor according to a second embodiment of the present invention.

FIG. 5 is a sectional view of a stator core of an electric motor according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a conventional electric motor.

[Explanation of symbols]

1 rotor 2 stator 3, 4 salient poles 3a, 3b, 4a, 4b Projection 5, 6 Yoke part 7, 8 windings 9 insulation

Continued front page    (72) Inventor Nobuto Ueno             1006 Kadoma, Kadoma-shi, Osaka Matsushita Electric             Sangyo Co., Ltd. F-term (reference) 5H002 AA01 AA05 AA07 AA09 AB01                       AB08 AE05 AE06 AE07 AE08

Claims (13)

[Claims] 1. A stator formed by winding a salient pole portion of a stator core, which comprises a plurality of salient pole portions projecting to the inner peripheral side and a yoke portion connecting the root portions of the salient pole portions to each other. And an inner periphery of the stator, which is an electric motor composed of a rotor rotatably held facing the salient pole portion, wherein the yoke portion is a rotor more than the yoke portion at the root of the salient pole. Has a portion (referred to as "proximity portion") closer to the front side, and the width of the yoke portion on the forward side in the rotation direction than the proximity portion is closer to An electric motor characterized by a larger size. 2. When the winding is applied to the side of the salient pole portion and the winding portion surrounded by the yoke portion, at least both side surfaces of the salient pole portion have an arbitrary axis (referred to as a symmetry axis). The electric motor according to claim 1, which is substantially symmetrical to each other. 3. The electric motor according to claim 1, wherein the salient pole portions are provided at two 180 ° symmetrical positions. 4. A stator yoke portion has a substantially rectangular shape, and a salient pole portion is provided from a substantially central portion of two sides facing each other toward an inner peripheral side, and another salient pole portion 2 facing each other. The electric motor according to claim 3, wherein a substantially central portion of the side is a close portion. 5. From the shortest distance between the salient pole portions facing each other,
The electric motor according to claim 3 or 4, wherein the shortest distance from the proximity portion of the yoke portion to the rotor or salient pole portion is small. 6. The electric motor according to claim 4, wherein the surface of the yoke portion on the winding side of the side having the salient pole portion is on the same plane on both sides of the salient pole portion. 7. The end of the salient pole portion protrudes to both sides of the forward side and the reverse side in the rotation direction so as to cover the rotor (referred to as a protrusion), and the width of the protrusion on the forward side in the rotation direction is The electric motor according to any one of claims 1 to 6, which is smaller than the width of the protrusion on the reverse side in the rotation direction. 8. The electric motor according to claim 7, wherein the protrusion length of the protrusion on the forward side in the rotation direction is smaller than the protrusion length of the protrusion on the reverse side in the rotation direction. 9. The electric motor according to claim 1, wherein a through hole is provided in the vicinity of the inner peripheral portion of the salient pole portion on the forward side in the rotation direction from the salient pole center. 10. The electric motor according to claim 9, wherein the through hole is an elongated hole inclined toward the forward side in the rotation direction from the inner peripheral portion of the salient pole portion toward the outer peripheral portion thereof. 11. The stator core according to claim 1, wherein a winding is applied in a state in which at least two pieces are divided on a side of the yoke portion where the salient pole portion is not present. The electric motor according to claim 1. 12. A rotor is provided with a rotor winding, and a current rectified by a commutator flows through the rotor winding by the same power source as that of the stator winding. The electric motor according to any one of claims 1 to 11. 13. The method according to any one of claims 1 to 12.
A moving body, which is equipped with the electric motor according to the item.