JPH0640466Y2 - Rotating magnetic field type motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a support structure for a stator and a coil of a small rotating magnetic field type motor using a rotor composed of a permanent magnet.

[Problems to be solved by conventional techniques and devices]

Stepping motors, DC brushless motors, etc. are well known as rotating magnetic field type motors using a permanent magnet rotor. The stator structure of this type of motor has a structure in which a plurality of stator pieces are arranged in a cylindrical yoke (for example, Japanese Utility Model Laid-Open No. 58-66874).
Issue gazette).

Therefore, as shown in FIG. 5, a rotor 10 having a permanent magnet is provided.
In the small rotating magnetic field type motor 2 rotating inside the stator piece 107 having the coil 108, the only coil frame 106 made of plastic for winding the coil 108 is provided, and the plurality of groove portions provided in the coil frame 106 are provided. One having a plurality of stator pieces 107 fixed and magnetically coupled to the cylindrical yoke 101 is conceivable. The stator piece 107 in this configuration is formed as shown in FIG. 6, and the processing method may be a metal injection method or a drawing method.

[Problems to be solved by the device]

However, as a method of processing such a stator piece 107, first, by processing by metal injection, after kneading and molding metal powder into a plastic binder, the binder is removed by degreasing, and further sintering is performed. There is a problem that the manufacturing method is complicated and the cost of this component is high.

Next, with drawing, high part accuracy cannot be obtained due to processing problems, and drawing with magnetic materials such as pure iron is difficult, and magnetic properties deteriorate when using processable materials. Therefore, there is also a problem that the efficiency of the motor deteriorates.

[Means for Solving the Problems]

In order to solve such a problem, the present invention provides a rotor including a cylindrical yoke formed of a magnetic material, and a permanent magnet rotatably supported by an axis portion of the yoke and having a plurality of magnetic poles on the outer circumference. Formed by bending a pair of plate members made of a magnetic material and having a magnetic pole portion facing the magnetic pole of the rotor and an iron core portion formed between the magnetic pole portion and a portion abutting the yoke. A plurality of stator pieces, a side plate fixed to the end of the yoke and having a positioning portion in the radial direction of the stator piece, a frame portion for fitting the iron core portion, and positioning for determining the positions of the stator pieces. And a coil frame integrally formed of a plastic material having a portion and a coil wound around the frame portion to excite the magnetic pole portion of the stator by energization.

[Action]

According to the structure of the present invention, the stator pieces are formed by bending a thin plate material by press working, and are combined into a pair. Therefore, the manufacturing method is simple and the cost of this component can be reduced. Further, even a material having a high magnetic property such as pure iron can be easily pressed. Therefore, when the pressed product is combined to form a stator piece, the magnetic property of the stator piece is improved. Therefore, the efficiency of the magnetic circuit of the motor is improved, and large torque and high efficiency can be obtained.

〔Example〕

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

First, FIGS. 1 to 4 show a first embodiment of the present invention, in which a rotor 2 composed of a cylindrical permanent magnet is provided at the center of a yoke 1 formed of a magnetic material in a thin cylindrical shape. The side plate 4 is fixed to the end of the yoke 1. The rotor 2 has a magnetized NS pole on its outer periphery, and a rotor shaft 3 integrally fixed to the center of the rotor 2. The rotor shaft 3 is a bush made of a bearing material fixed to the center of the side plate 4. It is rotatably supported by 5a and a bush 5b fixed to a coil frame 6 described later. Reference numeral 6 denotes a coil frame, which has a hollow portion 6c for accommodating the rotor 2 and three coils 8 for exciting three stator pieces 7 (stators), which will be described later, wound around the hollow portion 6c. 3 laps
Three frame portions 6a arranged at the relevant positions for division, and the frame portions
A push 5b made of a plastic material and integrally formed with a plastic material having three grooves 6b provided in the central portion of 6a and capable of accommodating an iron core portion 7a of a stator piece 7 described later.
Is stuck.

The stator piece 7 is divided into two and is formed by bending a thin plate of a magnetic material by pressing. The two stator pieces 7 having the same shape are combined as shown in FIG. 3 to form a pair.
And the magnetic pole portion 7b is configured. The shape of the tip of the iron core portion 7a is formed in an arc shape so as to be pressed against and coupled to the circular wall surface of the yoke 1, and the stator piece 7 is inserted into the groove portion 6b of the coil frame 6. After that, the coil 8 is wound around the frame portion of the coil frame 6 to become a unit state.

The unit is inserted into the cylindrical yoke 1, and the stator piece 7 and the yoke 1 are magnetically coupled by both the iron core portion 7a and the coil frame 6.

Further, as shown in FIG. 5, the stator piece 7 may be pressed against the inner wall surface of the yoke 1 in a state where the positioning portion 7d is extended without bending in order to press the inner wall surface of the yoke 1. As shown in FIG. 6, the positioning portion 7e extended as shown in FIG. 6 may be formed by slightly expanding the tip so that the positioning portion 7e is easily pressed against the inner wall surface of the arc, and as shown in FIG. The fitting portions 7f and 7g may be formed to facilitate assembly.

The stator piece 7 has an arc-shaped magnetic pole portion 7b facing the outer circumference of the rotor 2 and an iron core portion 7a penetrating the central portion of the coil 8 and abuttable on the inner wall surface of the yoke 1. Although it is made of a magnetic material, it is placed in a relative position that divides the circumference into three parts by being inserted into the groove portions 6b of the coil frame 6, respectively.

Further, the coil frame 6 is provided with a positioning portion 6d for restricting the radial position of the stator piece 7, and the side plate 4 is also provided with a positioning portion 4a similar to the above. Further, after the stator pieces 7 are inserted into the groove portions 6b of the coil frame 6, the coils 8 are wound around the frame portion 6a of the coil frame 6. After that, the terminals of the coil 8 are connected to the pattern of the printed wiring board 9 fixed to the ends of the coil frame 6, whereby the coil frame 6, the stator piece 7, the coil 8, and the printed wiring board 9 are connected. Is one unit. Since the stator piece 7 is inserted into the groove portion 6b and then the coil 8 is wound around the frame portion 6a, the axial direction and the radial direction of the stator piece 7 are restricted so that the stator piece 7 does not come off from the coil frame 6. The rotor 2 and the side plate 4 are assembled to the unit and then inserted into the yoke 1 to fix the side plate 4 and the yoke 1.

On the other hand, the relationship between the yoke 1 and the stator piece 7 is such that the magnetic pole portion 7b is engaged with both the positioning portion 6d of the coil frame and the positioning portion 4a of the side plate in order to reduce magnetic loss between the yoke and the stator. And the end surface of the iron core portion 7a is joined to the yoke 1
While being pressed against the inner wall surface of the rotor, the positioning portions 6d and 4a also maintain a gap between the magnetic pole portion 7b and the outer periphery of the rotor 2 at a predetermined interval.

In the operation of the motor in the configuration of the above-described embodiment, an output signal of a drive circuit (not shown) connected to the pattern of the printed board 9 is applied to the coil 8 to excite the stator piece 7 and magnetic pole portion. A magnetic field is generated in 7b and the rotor 2 rotates in a predetermined direction, which is well known.

In the above-mentioned embodiment of the present invention, the form of the three-phase motor is composed of three coils and the stator.

Further, the shape of the stator piece of the present embodiment is an arc shape in the portion that comes into pressure contact with the yoke, but in order to improve the workability of press working, the arc shape in the portion that comes into pressure contact with the yoke is eliminated and It is also possible to adopt a structure in which the yoke is pressed against the yoke more easily than in the conventional example shown in FIG.

[Effect of device]

As described above, in the small rotating magnetic field type motor including the cylindrical yoke, the permanent magnet rotor, the plurality of stator pieces, and the plurality of coils for exciting the stator pieces, the stator pieces serve as magnetic poles of the rotor. The stator piece has an opposing magnetic pole portion and an iron core portion extending from the magnetic pole portion and contacting the yoke. The stator piece is formed by bending a thin plate material by press working, and is formed by combining them. It is configured. Therefore, the manufacturing method is simple,
The cost of this component can be reduced. Further, even a material having a high magnetic property such as pure iron can be easily pressed, so that the magnetic property is improved if the pressed product is combined to form a stator. Therefore, in this motor, the efficiency of the magnetic circuit is improved, and large torque and high efficiency can be obtained.

[Brief description of drawings]

1 to 4 are views showing a first embodiment of the present invention. FIG. 1 is a transverse cross-sectional view of the main part of the motor, FIG. 2 is a vertical cross-sectional view thereof, and FIG. 3 is a perspective view of a stator piece of this motor.
The figure is a perspective view of a coil frame of this motor. 5 and 6 are views showing a conventional rotating magnetic field type motor, FIG. 5 is a transverse sectional view of the motor, and FIG. 6 is a perspective view of a stator piece thereof. 1 ... Yoke, 2 ... Rotor, 4 ... Side plate, 6 ... Coil frame, 7
… Stator pieces, 8… Coil

Claims (1)

[Scope of utility model registration request] 1. A yoke, a rotor, a plurality of stator pieces, and a coil, wherein the yoke is a tubular member made of a magnetic material, and the rotor is made of a permanent magnet. In addition, the stator is rotatably supported by the center of the yoke, and each of the plurality of stator pieces is a pair formed by bending a magnetic plate material. , An arc-shaped magnetic pole portion and an iron core portion protruding from the magnetic pole portion, the side plate is fixed to the end portion of the yoke, and a positioning portion is formed, and the coil frame is A frame portion integrally formed of plastic, which is formed at a relative position that divides the periphery into a plurality of portions, a groove portion provided in the central portion of each frame portion, a hollow portion, and a positioning portion protruding into the hollow portion. And has the above fixed The piece fits with its position regulated by the positioning portion of the coil frame, the iron core portion of the stator piece fits into the groove portion of the coil frame, and its end face is on the inner wall surface of the yoke. The side plate is fixed to the end portion of the yoke and positions the stator piece in the radial direction, and the coil is attached to each of the frame portions of the coil frame. Is wound,
A rotating magnetic field type motor characterized in that the stator piece is excited by energization.