JP2003032923A - Electric motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-efficiency electric motor having a stator which can be easily mounted on a housing and prevents idling by improving a space factor of a stator winding while securing a magnetic path. The purpose is to do. SOLUTION: After a stator piece 3 divided into 12 pieces is insulated with insulating paper 5, a winding 4 is wound. This stator piece is 12
When joined in a ring shape, the outer shape of the stator becomes a dodecagon. Since the hollow portion of the housing 1 has the same shape as the outer shape of the stator 2, positioning and idling prevention can be easily performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor having a stator housed in a housing.

[0002]

2. Description of the Related Art In recent years, robots as industrial equipment, N
In C machine tools, semiconductor manufacturing equipment, and the like, miniaturization and high performance have progressed, and the same demand has been made for electric motors mounted as drive sources.

Miniaturization and high efficiency are one of the important requirements for improving the portability of equipment and saving energy and resources.

Further, in terms of higher performance, higher speed has been advanced to improve tact time, and further higher speed rotation is required for electric motors.

In order to deal with these problems, it is common practice to divide the stator and provide concentrated windings to each of them to increase the space factor of the windings and to improve the efficiency of the electric motor to reduce the size. It is taken.

[0006] Then, the rigidity of the divided stator is secured and at the same time, the heat of the winding is radiated to be housed in the housing.

[0007]

However, the above-mentioned conventional housing inner peripheral portion is generally circular in shape, and therefore the outer peripheral shape of the stator needs to be circular.

Further, since the yoke shape of the stator is circular at the outer peripheral portion, it is difficult to secure both the magnetic path and the slot cross-sectional area, which hinders the improvement of the winding space factor.

Further, since it is circular, it is necessary to position it in the rotational direction when mounting the housing and the stator. Furthermore, when it is used for instant reversal or repeated start and stop,
There is a possibility that the stator will rotate idly just by fixing the housing and the stator with a crimp, and it was necessary to add a slip prevention mechanism.

The present invention has been made to solve the above-mentioned conventional problems and improves the space factor of the stator winding while ensuring a proper magnetic path, and can be easily mounted on the housing to prevent idling. An object is to provide a high-efficiency electric motor including a child.

[0011]

In order to solve the above-mentioned problems, in the electric motor of the present invention, the stator pieces, which are divided and laminated in the circumferential direction in units of pole teeth, are composed of straight portions which are orthogonal to the center line of the teeth portion. A stator having an outer peripheral portion of a yoke, an annular portion of which is joined to a stator piece in which a tooth is insulated and a winding is wound, and a housing having a hollow portion having the same polygonal shape as the outer periphery of the stator. The housing is equipped with the stator.

[0012]

In order to solve the above-mentioned problems, the invention according to claim 1 is a yoke in which a stator piece which is divided and laminated in a circumferential direction in units of pole teeth is a straight line orthogonal to the center line of the teeth portion. A stator having an outer peripheral portion, in which teeth are insulated and a stator piece in which a winding is wound is joined in an annular shape, and a casing having a polygonal hollow portion that is the same as the outer periphery of the stator is provided. The stator is attached to this housing.

In addition to the first aspect of the present invention, the invention according to the second aspect further comprises a yoke inner peripheral portion forming a right angle with respect to the center line of the teeth portion.

Furthermore, the invention according to claim 3 is the same as claim 1.
In addition to the above, it is provided with an inner peripheral portion of the yoke forming an obtuse angle or a concave curve with respect to the center line of the teeth portion.

As described above, when the stator pieces are joined in an annular shape, the outer periphery of the stator has a polygonal shape, and idling can be prevented only by mounting the stator piece in the hollow portion of the housing. Further, the winding space factor can be improved as compared with the conventional stator having a circular outer circumference while securing a magnetic path by the shape of the inner and outer circumferences of the yoke.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) In FIG. 1, reference numeral 1 is a housing of an electric motor having a dodecagonal hollow portion, 2 is a stator, and a stator piece 3 divided into 12 equal parts in a circumferential direction, a winding 4, The insulating paper 5 covers the slot portion of the stator piece 3.

After the stator piece 3 divided into 12 pieces is insulated with the insulating paper 5, the winding 4 is wound. When 12 pieces of the stator are joined in a ring shape, the outer shape of the stator becomes a dodecagon. Since the hollow portion of the housing 1 has the same shape as the outer shape of the stator 2, positioning and idling prevention can be easily performed.

The shape of the yoke of the stator piece and the improvement of the space factor of the winding will be mainly described below.

In FIG. 2, reference numeral 23 is a stator piece, 26 is a yoke portion, 27 is a tooth portion, 28 is a yoke outer peripheral portion, and 29 is a yoke outer peripheral portion.
Is the inner circumference of the yoke.

First, the yoke outer peripheral portion 28 is orthogonal to the tooth portion 27 center line of the stator piece 23, and the yoke inner peripheral portion 29 is perpendicular to the tooth portion 27 center line to secure a magnetic path. The slot cross-sectional area can be enlarged (inner broken line portion) as compared with the conventional case, and the space factor of the winding can be improved.

After the insulation treatment, the teeth portion 27
Concentrate the winding for each. Next, the wound stator piece is mounted in the regular dodecagonal hollow portion of the housing 1, but the outer shape of the stator formed by joining the stator pieces 23 in an annular shape is also a regular dodecagonal shape, so positioning is easy. And it can prevent idling.

Since it can be carried out by changing the shape of the hollow portion from a circular shape to a polygonal shape by making the outer shape of the housing the same as in the conventional case, a high-efficiency electric motor having the same outer shape of the housing can be obtained. Further, the present embodiment is an example of 12 divisions, but other division examples can be carried out by matching the polygonal shape of the hollow portion of the housing with the outer shape of the stator.

(Example 2) Example 2 is different from Example 1 only in the shape of the inner peripheral portion of the yoke.

In FIG. 3, 33 is a stator piece, 36 is a yoke portion, 37 is a tooth portion, 38 is a yoke outer peripheral portion, 39.
Is the inner circumference of the yoke.

Similar to the first embodiment, the yoke outer peripheral portion 38 is orthogonal to the tooth portion 37 center line of the stator piece 33, and the yoke inner peripheral portion 39 is formed at an obtuse angle with respect to the tooth portion 37 center line to form a magnetic path. Secure. As a result, the slot cross-sectional area can be increased (inner dashed line portion) compared to the conventional case, and the winding space factor can be improved.

In FIG. 4, 43 is a stator piece, 46 is a yoke part, 47 is a tooth part, 48 is a yoke outer peripheral part, and 49 is a yoke outer peripheral part.
Is the inner circumference of the yoke.

The yoke inner peripheral portion 49 is formed as a concave curve with respect to the center line of the tooth portion 47 to secure a magnetic path. As a result, the slot cross-sectional area can be increased (inner dashed line portion) compared to the conventional case, and the winding space factor can be improved.

After the stator piece is insulated as in the first embodiment, a winding is wound around the teeth, and the stator piece is annularly joined and mounted in the hollow portion of the housing.

[0030]

As is apparent from the above embodiment, according to the invention described in claim 1, the stator having a polygonal outer shape is mounted on the housing having a hollow portion having the same shape as the outer shape of the stator. Therefore, the positioning and idling prevention mechanism can be eliminated.

According to the second and third aspects of the present invention, the winding space factor can be improved while securing the magnetic path of the stator, and the efficiency of the electric motor can be improved.

Therefore, it is possible to obtain a highly efficient electric motor having a stator which can secure the magnetic path, improve the space factor of the stator windings, can be easily mounted on the housing, and can prevent idling.

[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 an explanatory diagram of a yoke shape according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of a yoke shape according to the second embodiment of the present invention.

FIG. 4 is an explanatory diagram of another yoke shape according to the second embodiment of the present invention.

[Explanation of symbols]

1 case 2 stator 3, 23, 33, 43 Stator pieces 4 windings 5 insulating paper 26, 36, 46 Yoke part 27, 37, 47 Teeth 28, 38, 48 Yoke outer periphery 29, 39, 49 Inner circumference of yoke

Continued front page    F-term (reference) 5H002 AA01 AA08 AB01 AB04 AE06                       AE08                 5H603 AA04 AA09 BB01 BB05 BB12                       CA01 CA05 CB02 CB26 CC11                       CC17 CD01 CD04 CD21                 5H604 AA05 AA08 BB01 BB08 BB14                       CC01 CC05 CC16 DB26 PB03

Claims (3)

[Claims] 1. A stator piece, which is divided and laminated in the circumferential direction in units of pole teeth, has a yoke outer peripheral portion made of a straight line orthogonal to the center line of the tooth portion, and the tooth portion is insulated to wind a winding. A stator in which the mounted stator pieces are joined in an annular shape, and a housing having a polygonal hollow portion that is the same as the outer circumference of the stator,
An electric motor in which the stator is attached to the housing. 2. The electric motor according to claim 1, wherein the stator piece includes a yoke inner peripheral portion forming a right angle with respect to a tooth portion center line. 3. The electric motor according to claim 1, wherein the stator piece includes a yoke inner peripheral portion that forms an obtuse angle or a concave curve with respect to the center line of the teeth portion.