JPH10174317A - Stator and motor frame of motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To minimize the amount of waste material resulting from punching of a plate. SOLUTION: The stator 13 is formed into a band shape, and comprises a back yoke 6 having a plurality of grooves 5 formed on one longer side and V-shaped notches 4 formed between the grooves 5; and T-shaped teeth 7 that are to be press-fit into the grooves 5 and have projections 3c the shape of which corresponds to the shape of the grooves 5. A wire 8 is wound around the teeth 7, and then the projections 3c on the teeth 7 are press-fit into the grooves 5. Or, the projections 3c on the teeth 7 are press-fit into the grooves 5, and then a wire is wound around the teeth 7. Thereafter, the back yoke 6 is bent using the notches 4 as fulcrum in such a direction that the teeth 7 will face toward the axial center, and is formed into a ring shape to obtain the stator 13. A motor frame is obtained by molding the stator 13 using resin or premix.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION A stator core formed by laminating a core formed by a plurality of teeth and a back yoke for connecting these teeth, and winding the stator core around each tooth. The present invention relates to a stator for a motor, comprising: a winding;

[0002]

2. Description of the Related Art A conventional stator having an inner rotor type stator, which is a brushless DC motor, will be described with reference to FIGS. FIG. 5 is a front view of a conventional motor stator. FIG. 6 is a front view illustrating a method of winding the stator core of FIG.

In FIG. 5, a stator core 15 is formed by stacking punched plates formed by punching a hoop material made of a steel plate. The blank is formed of a back yoke 16 formed in a ring shape and twelve teeth 17 extending from the back yoke 16 toward the axial center. This tooth 17 is formed in a T shape,
A tooth body 17a around which the winding 18 is wound and a converging portion 17b formed in a square shape for converging magnetism.

[0004] A winding 18 is wound around each tooth body 17 a of the stator core 15 to form a stator 19. An insulating material 20 for electrical insulation is provided between the winding 18 and the stator core 15.

In FIG. 6, one method for winding the winding 18 around the teeth body 17a of the stator core 15 in FIG. 5 is performed by using a nozzle 21 having a hollow thin tube inside. That is, the winding 18 is passed through the nozzle 21, the tip 18 a of the winding 18 passing through the nozzle 21 is fixed at an arbitrary position, and the tip of the nozzle 21 is
7a, the winding 18 is wound around the tooth body 17
It is wound around a.

[0006]

As described above, in the conventional stator core, a steel plate is punched out to form a blank, but the steel plate in the slot portion of the stator core is not required. Further, when the steel plate at the inner diameter of the stator core is not used as the yoke of the rotor, the inner diameter is unnecessary, and is treated as waste material.

[0007] Further, when winding the teeth around the teeth with the nozzle, it is necessary to make the width of the opening larger than the diameter of the nozzle. Therefore, the rotor rotates, and the pulsation when the boundary between the poles of the permanent magnet passes through the opening increases. Furthermore, since the winding is wound by inserting the nozzle inside the slot, a space is required inside the slot that does not interfere with the winding wound on the adjacent teeth. The ratio occupied by the lines and the space factor are reduced.

[0008]

Therefore, according to the present invention, a plurality of notches are formed on one long side and a V-shaped notch is provided between these notches. And a T-shaped tooth having a projection having a shape corresponding to the shape of the notch groove pressed into the plurality of notch grooves, and winding a winding around these teeth. After that, the tooth protrusion is press-fitted into the notch groove, or the tooth protrusion is press-fitted into the notch groove, and then a winding is wound around the tooth, and the V-shaped cut portions are used as fulcrums. A motor stator characterized in that the back yoke is bent and formed in a ring shape in a direction in which the teeth face the axial center direction.

Further, there is provided a motor frame characterized in that the stator of the motor is formed by molding with resin or premix.

[0010]

After winding the winding around the tooth with the layered winding, the tooth is pressed into the notch groove of the back yoke. Alternatively, the teeth are pressed into the cutout grooves of the back yoke, and the winding is wound around the teeth. Then, the back yoke is bent with the V-shaped cut portion provided in the back yoke as a fulcrum to form a stator in which the back yoke has a ring shape.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described with reference to FIGS. FIG. 1 is a plan view of a back yoke and teeth of the present invention punched from a hoop material. FIG. 2 is a perspective view showing the connection between the stacked back yoke and the teeth of FIG. 1.
FIG. 3 is a front view illustrating a winding method of the stator core. FIG. 4 is a front view of a stator formed in a ring shape.

In FIG. 1, a hoop material 1 includes a back yoke plate 2 formed in a belt shape and twelve teeth plates 3.
Is punched out. On one long side of the back yoke plate 2, twelve V-shaped cuts 4 are provided at equal intervals. In addition, a notch groove 5 for attaching the teeth plate 3 is provided in a long side portion between each of these cut portions. The teeth plate 3 is formed in a T-shape, and a teeth main body 3a around which a winding to be described later is wound, a converging portion 3b formed in a square shape for converging magnetism, and The projection 3c is provided on the opposite side of the converging portion 3b via the teeth main body 3a.

The back yoke plate 2 and the tooth plate 3
Is punched out of the hoop material 1 as described above, but a plurality of strip-shaped back yoke plates 2 are solidified and punched, and the tooth plate 3 is arranged in the same direction as an arbitrary tooth plate 3 and this tooth. A steel plate is punched in a shape in which a tooth plate 3 arranged in a direction opposite to the tooth plate 3 is inserted into a space between adjacent tooth plates 3. By adopting such a shape, the amount of waste material of the steel sheet remaining after punching can be suppressed.

In FIG. 2, the back yoke plate 2 and the teeth plate 3 punched from the hoop material 1 of FIG. 1 are laminated to form the back yoke 6 and the teeth 7, respectively. Then, the projections 3c of the teeth 7 are press-fitted into the cutout grooves 5 of the back yoke 6. When laminating the back yoke plates 2, the notch grooves 5 of several stacked back yoke plates 2 on the side where the projections 3 c of the teeth plate 3 are inserted are replaced with the notch grooves 5 of the other back yoke plates 2. By making the notch groove slightly wider, it is easy to insert the protrusion 3c of the teeth plate 3 by making it easier to enter.

In FIG. 3, after the teeth 7 are pressed into the back yoke 6, the teeth body 3a around which the winding 8 is wound and the winding wound around the teeth body are considered to come into contact with the teeth body 3a. The insulating material 9 is attached to the teeth and the back yoke to be formed. The insulating material 9 may be attached before the winding 8 is wound and before or after the teeth 7 are pressed into the back yoke 6.

The winding 8 is wound in a state of the teeth 7 before being pressed into the back yoke 6 or in a state where the teeth 7 after being pressed into the back yoke 6 are arranged in parallel. Thus, the space factor of the winding 8 in each slot 10 is improved. That is, when the teeth 7 are arranged in parallel, the width of the tip of the converging portion 3b of one tooth 7 and the tip of the converging portion 3b of the adjacent tooth 7, the width of the opening 11, and the area in the slot portion 10 are: Opening 1 after bending back yoke 6 described later
1 and the area inside the slot portion 10. Furthermore, since the winding 8 can be wound without considering a space for operating the nozzle 12, the space factor can be improved as compared with the related art.

Further, the width of the opening 11 can be determined regardless of the diameter of the nozzle 12. That is, the magnetic force may be set to such a width that the magnetic force does not cause a short circuit between the converging portions 3b of the adjacent teeth 7.

In FIG. 4, the teeth 7 bend the back yoke 6 in the direction toward the center of the axis, with each notch 4 of the back yoke 6 as a fulcrum. Then, the back yoke 6 is formed in a ring shape, and both ends of the back yoke 6 are fixed with an adhesive or welding to form a so-called inner rotor type stator 13. Further, the angle of the cut of the cut portion 4 is set such that the opposed slopes of the cut portion 4 can contact each other when the back yoke 6 is formed in a ring shape.

When there is a possibility that the winding 8 wound on one tooth 7 and the winding 8 wound on the adjacent tooth 7 may come into contact with each other, an insulating material is interposed between the windings 8. 14 is inserted.

Even if the stator according to the present invention described above is inserted into a conventional motor frame made of steel plate to assemble the motor, the stator according to the present invention has fixed corners due to the presence of corners. Based on the outer circumference of the child,
It becomes difficult to assemble the motor. That is, the mounting accuracy of a bearing or the like mounted on the motor frame deteriorates. Therefore, the stator is molded with resin or premix to form a motor frame. That is, since the motor frame can be easily configured with reference to the inner peripheral portion of the stator, a motor frame with high assembly accuracy can be configured when assembling the motor.

In the case where the windings are wound in a state where the teeth are arranged in parallel, for example, in the case of a 12-slot stator, twelve winding devices are installed so as to correspond to each of the teeth. Can be wound.

Further, when winding the winding around each tooth before the tooth is pressed into the back yoke, the winding is wound in a state where a plurality of teeth are connected since each winding is wound individually. Rather than being wound, a layered winding in which the windings are arranged in an orderly manner can be performed. In other words, the winding can be wound while rotating the tooth itself by itself, and furthermore, the tooth is swung in the left-right direction (the tooth is swung in the radial direction when formed as a stator). Even when winding a wire, the relationship between the amount of swinging the teeth and the number of rotations that rotate the teeth, rather than winding the winding in a state where multiple teeth are connected,
This is because it can be finely adjusted. When the windings are arranged in this manner, the space factor of the windings in each slot can be improved.

In the present invention, since the winding is wound in a state where the opening is opened and the area of the slot is widened, the space factor of the winding in each slot can be improved. At this time, if the space factor of the winding and the pulsation generated when rotating the rotor are not taken into consideration, the winding may be wound in a state in which the back yoke is bent and formed into a ring shape. At this time, the size of the winding device can be reduced.

[0024]

According to the present invention, the amount of waste material of a steel sheet after punching a blank can be minimized. In the inner rotor type stator, the space factor of the winding in each slot can be improved. Also,
The width of the opening of the stator can be reduced.

[0025]

[Brief description of the drawings]

FIG. 1 is a plan view of a back yoke and teeth of the present invention punched from a hoop material.

FIG. 2 is a perspective view showing the connection between the stacked back yoke and teeth of FIG. 1;

FIG. 3 is a front view illustrating a winding method of a stator core.

FIG. 4 is a front view of a stator formed in a ring shape.

FIG. 5 is a front view of a conventional motor stator.

FIG. 6 is a front view illustrating a method of winding the stator core of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Hoop material 2 ... Back yoke plate 3 ... Teeth plate 4 ... Cut-out part 5 ... Notch groove 6, 16 ... Back yoke 7, 17 ... Teeth 8, 18 ... Winding 9, 14, 20 ... Insulation material 10 ... Slot Part 11: Opening 12, 21: Nozzle 13, 19: Stator 15: Stator core

Claims (2)

[Claims] A back yoke formed in a band shape and provided with a plurality of notches on one long side thereof and a V-shaped notch between the notches; A T-shaped tooth having a protrusion corresponding to the shape of the notch groove, which is press-fitted into the notch groove, and after winding a winding around these teeth, the tooth protrusion is inserted into the notch groove. After press-fitting, or after press-fitting a tooth projection into the cutout groove, winding a coil around the tooth, using the V-shaped cut portions as fulcrums, in a direction in which the tooth faces the axial center direction. , Bending the back yoke,
A motor stator characterized by being formed in a ring shape. 2. A motor frame, wherein the stator of the motor is formed by molding with resin or premix.