JPS61262063A - Cylindrical direct-acting motor - Google Patents

Abstract

PURPOSE:To facilitate processing assembly and improve radiating property, by arranging a plurality of yoke bodies formed with laminated magnetic sheets, radially, and by inserting non-magnetic bodies into wedge-shaped space sections between the respective yoke bodies to form a cylindrical yoke section. CONSTITUTION:A yoke body 3 of rectangular cross section is formed by laminating magnetic sheets 5, and a plurality of the yoke bodies are radially arranged. Into wedge-shaped space sections 6 formed between the respective yoke bodies 3, non-magnetic bodies 4 are inserted, and a cylindrical yoke section 2 is formed as a whole. On the penetrating hole section 8 of the yoke section 2, a coils section is arranged to form a stator. As the result, the cross sections of the magnetic sheets 5 and the yoke bodies 3 can be formed in rectangular shapes, and so the processing assembly is simplified. The non-magnetic bodies 4 have no relation with magnetic characteristic, and so if a hollow section is set and cooling agent is made to flow, the radiating property of the coil section can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cylindrical direct-acting motor, and particularly to the structure of a stator.

[Prior art]

A conventionally known example of a cylindrical direct-acting motor is one in which a conductor ring is attached to the armature, thereby making the magnetic flux uniform within the air gap or inside the armature, as disclosed in U.S. Patent Publication No. 3,891°874. Disclosed. However, in order to improve the characteristics of the cylindrical direct-acting motor, it is necessary to give sufficient consideration to the stator structure.

6 and 7 are related to a conventional cylindrical direct-acting electric motor, FIG. 6 is a vertical cross-sectional front view of the stator, and FIG. 7 is a partial side view taken in the direction of the ■ arrow in FIG. 6. be.

The stator 21 is formed into a hollow cylindrical shape, with a pair of AC coils 22 and DC coils 23, and a plurality of yoke bodies 24 made of magnetic material surrounding these coils 22, 23 and arranged in a radially laminated manner. It consists of a yoke part 25.

An alternating current flows through the AC coil 22, and a DC power source is connected to the DC coil 23. The DC coil 23 may be replaced with a permanent magnet, but this is for adding a bias current to the armature driving force generated by the AC magnetic field.

As shown in FIG. 7, the yoke body 24 is composed of a plurality of silicon steel plates 26, which are magnetic materials and usually have a trapezoidal cross section. It is desirable that the thickness of the silicon steel plate 26 be as thin as possible in order to suppress disturbance of the magnetic flux in the cylindrical direction. In other words, due to the characteristics,
It is desirable that each yoke body 24 be constructed of a large number of silicon steel plates 26.

[Problem that the invention seeks to solve]

However, in the stator structure, the thin silicon steel plate 2
6 into a trapezoidal cross section and stacking the yoke body 24 made of these silicon steel plates into a perfect cylinder is extremely difficult in terms of production technology, and the required roundness and concentricity may vary. There was a problem.

Even if it were possible to process the silicon steel plate 26 with high precision, there was a problem in that deterioration of the characteristics of the magnetic material during processing was inevitable and the cost was high.

SUMMARY OF THE INVENTION The present invention aims to solve these problems and provide a cylindrical direct-acting motor that facilitates machining of the yoke of the stator and efficiently removes heat generated in the coil. be.

[Means for solving problems]

To achieve the above object, the present invention includes a coil part, a plurality of yoke bodies formed of a magnetic material and arranged radially stacked in a cylindrical direction with a certain space part surrounding the coil part, and the space part. The stator is comprised of a non-magnetic material inserted into the stator and a yoke portion formed into a hollow cylindrical shape.

[For production]

According to the above configuration, the cross-sectional shape of the yoke body constituting the yoke portion can be made into a rectangular cross-section that is easy to process.

〔Example〕

The present invention will be explained below based on embodiments shown in the drawings.

FIG. 1 shows a perspective view of a stator of a cylindrical direct-acting motor according to a first embodiment of the present invention. The iron body 3 and a plurality of non-magnetic bodies 4 form a hollow cylindrical shape.

The yoke body 3 is made of one or more, for example, six silicon steel plates 5 made of magnetic material and has a rectangular cross section, and each adjacent yoke body 3 has a wedge-shaped space 6 and penetrates through the center. Holes 8 are formed and they are arranged radially stacked in the cylindrical direction.

The silicon steel plate 5 is coated with a magnetic shielding film. The non-magnetic material 4 has a wedge-shaped cross section that has the same shape as the space 6, and by inserting and fixing each non-magnetic material 4 alternately into each space 6 of the yoke plate 3, a hollow cylindrical joint is formed. An iron portion 2 is formed.

Next, the operation of the first embodiment of the present invention will be explained.

The silicon steel plate 5 constituting the yoke body 3 can be used as it is formed by rolling or the like, and does not require post-processing, so there is no risk of deterioration of magnetic properties. Furthermore, if products from the same lot are used, there will be little variation in the thickness of the silicon steel plates 5, and the precision of the yoke body 3 will be improved.

The cylindrical accuracy of the yoke part 2 can be adjusted by the non-magnetic material 4, and the non-magnetic material 4 is a factor that has almost no effect on the characteristics of the electric motor, and changes in the material during wedge-shaped processing, etc. There is no need to consider it at all.

Since the yoke 3 of the stator 1, which determines the characteristics of a cylindrical direct-acting motor, can be made of silicon steel plate 5 of any thickness, the magnetic flux in the longitudinal direction of the stator 1 can be made uniform, improving the characteristics of the motor. do. Further, the number of yoke bodies 3 and non-magnetic bodies 4 can be arbitrarily determined depending on the dimensions of the yoke body 3 and the like.

In addition, the length of the non-magnetic material 4 is set to be the same length as the yoke body 3 in this embodiment, but the non-magnetic material 4 is divided into small pieces, and a pair of small pieces are attached to the yoke body 3. It may be inserted only in the vicinity of both the left and right end surfaces. Further, the nonmagnetic material 4 may have a trapezoidal cross section as shown in FIG.

FIG. 3 shows a partial vertical sectional view of the yoke part 2 according to the second embodiment of the present invention, and the non-magnetic body 4 has a hollow part 10 penetrating in the axial direction of the yoke part 2. It is formed. The other configurations are similar to those shown in the first embodiment, and their explanation will be omitted.

Next, the operation of the second embodiment of the present invention will be explained.

It is a well-known fact in electromagnetism that the output of a motor is proportional to the number of turns of the coil and the value of the current flowing through the coil.

On the other hand, since the amount of heat generated in a coil is proportional to the square of the resistance value and current value of the coil, once the coil specifications are determined, it is logically determined by the power supply voltage. Therefore, it is possible to adjust the output by adjusting the power supply voltage, but a limit value must naturally be set in consideration of the heat generation and temperature rise of the coil. Therefore, it is possible to increase this limit value by devising a cooling structure that effectively removes the heat generated by the coil.

The second embodiment was devised based on the above idea, and is based on the basic concept of the first embodiment in which the yoke portion 2 is composed of a yoke body 3 made of magnetic material and a non-magnetic material 4. A hollow part 10 is provided in the non-magnetic material 4 that expands and does not affect the characteristics of the motor, and when water or an electric motor is applied to a fluid pumping means such as a compressor, the operation of the hollow part 10 is Cooling efficiency is improved by flowing fluid.

In the above embodiment, only one cavity 10 is provided in one non-magnetic material 4, but a plurality of cavities 10 may be provided, and the cavity 10 may be provided in the radial direction without being limited to the axial direction. Of course, the cavity 10 may also be provided.

It is easy to form the cavity 10 in the non-magnetic material 4 by applying casting technology, welding technology or forging technology, as shown in FIG.
3 is a partial longitudinal cross-sectional view of a system stator 1 according to another embodiment of the system shown in FIG. It is formed.

In this embodiment, since the cooling fluid can flow near the coils 2 and 3, the heat transfer characteristics are improved and the cooling performance is improved. In addition, if it is possible to install the coolant in a sealed structure using an electric motor or pressure feeding means, it is possible to create a flow passage structure that allows the coolant to flow through the through holes 8 as well. It will also be possible to cool the

FIG. 5 shows a third embodiment of the present invention, which is integrated with both left and right ends (only the right end side is shown) of a plurality of yoke bodies 3 arranged at the same relative positions as shown in FIG. A plurality of non-magnetic bodies 4 each having a wedge-shaped cross section are inserted.

The other configurations and operations are similar to those shown in the first embodiment, and their explanations will be omitted.

〔Effect of the invention〕

As described above, according to the present invention, the yoke portion of the cylindrical direct-acting motor is composed of the yoke body with a rectangular cross section and the non-magnetic material with a wedge-shaped or trapezoidal cross section, so that the yoke portion can be easily processed. However, it is possible to process the stator with enhanced cylindrical properties. Furthermore, since non-magnetic materials do not affect the motor characteristics, any cavity can be provided, and by flowing coolant into the cavity, the coil can be cooled effectively, improving the characteristics of the motor. .

[Brief explanation of drawings]

Fig. 1 is a perspective view of a yoke portion of a cylindrical direct-acting motor according to a first embodiment of the present invention, and Fig. 2 is a portion of a yoke portion according to another embodiment of the non-magnetic material shown in Fig. 1. 3 is a vertical cross-sectional view of parts of a yoke according to a second embodiment of the present invention; FIG. 4 is a partial longitudinal cross-sectional view of a stator according to another embodiment of the structure shown in FIG. 3; FIG. is an exploded perspective view of a yoke body and a non-magnetic material according to a third embodiment of the present invention, and FIGS. 6 and 7 are diagrams according to a conventional example.
FIG. 6 is a longitudinal sectional view of the stator, and FIG. 7 is a partial side view taken in the direction of the arrow ■ in FIG. 1... Stator, 2... Yoke part, 3... Yoke body,
4... Non-magnetic material, 5... Silicon steel plate as an example of a magnetic plate, 6... Space, 10... Cavity, 22... AC coil, 23... DC coil.

Claims (4)

[Claims] (1) A coil part, a plurality of yoke bodies made of magnetic material and arranged radially stacked in a cylindrical direction with a certain space surrounding the coil part, and a non-magnetic material inserted into the space. A cylindrical direct-acting motor characterized by having a stator comprising: and a yoke portion formed into a hollow cylindrical shape. (2) The yoke is made of one or more magnetic materials with a rectangular cross section, and the cross-sectional shape of the portion of the non-magnetic material inserted into the space is wedge-shaped or trapezoidal. A cylindrical direct-acting motor according to claim 1. (3) 1 that penetrates the non-magnetic material in the axial direction of the yoke part;
The cylindrical direct-acting motor according to claim 1, characterized in that one or more hollow portions are provided. (4) The cylindrical direct-acting motor according to claim 1, wherein the yoke portion is provided with one or more hollow portions in the radial direction.