JPH087821Y2 - motor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Prior Art] The present invention relates to a motor.

[Prior Art and Its Deficiencies] Generally, an inner rotor type motor includes a substantially cylindrical housing, pole teeth provided at intervals in the housing in a circumferential direction, and an armature wound around the pole teeth as required. The coil, the rotor rotatable relative to the housing, and the rotor magnet attached to the rotor are provided. The rotor magnets are arranged inside and opposite to the pole teeth, and the rotor is rotated in a predetermined direction with respect to the housing by supplying an electric current to the armature coil as required.

However, in the conventional motor, end walls such as bearing brackets are provided at both ends of the housing, and the armature coil wound around the pole teeth is arranged between the both end walls. Therefore, the motor is maintained while maintaining high torque. It has been difficult to reduce the overall size, and especially to reduce the thickness.

[Object of the Invention] The present invention has been made in view of the above facts, and a main object of the present invention is to provide a motor that can achieve miniaturization of the entire motor, in particular, reduction in thickness.

[Summary of Invention]

According to the present invention, a housing, a pole tooth which is provided at a circumferential interval in the housing and protrudes inward in the radial direction, an armature coil wound around the pole tooth as required, and the housing. In a motor including a rotor that is relatively rotatable with respect to the rotor and a rotor magnet attached to the rotor, an opening is formed in the housing in correspondence with each of the pole teeth, and A motor is provided, characterized in that a part of the wound amateur coil is located in the corresponding opening.

In such a motor, since the part of the amateur coil protruding from the pole teeth is located in the opening of the housing, it is possible to effectively reduce the distance between the both end walls of the housing, thereby reducing the size of the motor as a whole. In particular, thinning is achieved.

[Specific example of device]

Hereinafter, a specific example of a motor according to the present invention will be described with reference to the accompanying drawings.

1 and 2, the illustrated DC motor is provided with a substantially short cylindrical housing indicated by numeral 2 as a whole. The housing 2 includes a cylindrical sleeve-shaped side wall 4 and an end wall 6 provided at one end of the side wall 4. A cylindrical boss portion 8 extending downward in FIG. 2 is integrally provided on the inner peripheral edge portion of the end wall 6, and a shaft member 12 is rotatably mounted on the boss portion 8 via a pair of bearing members 10. ing. This shaft member
A driving force transmission means (not shown) such as a pulley is attached to one end of the device 12.

A stator 14 is mounted on the inner peripheral surface of the side wall 4 of the housing 2. The stator 14 includes a stator core 16 fixed to the inner peripheral surface of the side wall 4, and the stator core 16 is integrally provided with pole teeth 18 at intervals in the circumferential direction. The pole teeth 18 are radially inward. Overhangs. An amateur coil 20 is wound around the pole tooth 18 as required. Further, a rotor magnet 22 is disposed inside the stator 14 so as to face the stator 14. In the specific example, a rotor yoke 24 is attached to the other end of the shaft member 12. This rotor yoke 24
The base portion 26 fixed to the shaft member 12, the inner side wall 28 extending substantially vertically from the outer peripheral edge of the base portion 26 toward the end wall 6, the connecting wall 30 extending radially outward from the inner side wall 28, and the connecting wall 30 from the above. It has an outer wall 32 extending substantially parallel to the inner wall 28,
A rotor magnet 22 is mounted on the outer peripheral surface of the outer side wall 32, and a rotation speed detecting magnet 34 is mounted on the outer peripheral side of the inner side wall 28.

A substrate 36 made of a metallic material is arranged at the open end of the side wall 4 of the housing 2. An electric element such as a Hall element 38 is provided on the substrate 36.
38 is arranged in the space between the inner wall 28 and the outer wall 32 of the rotor yoke 24, facing the magnet 34 for detecting the rotation speed.

In the motor as described above, the motor housing is constituted by the housing 2 and the substrate 36, and various constituent elements such as the stator 14 and the rotor magnet 22 are arranged in the motor housing. Then, by supplying a current to the armature coil 20 as required, the rotor magnet 22 and the rotor yoke 24 are rotated in a predetermined direction with respect to the housing 2 and the stator 14.

The motor of the specific example is further configured as follows in order to reduce the size of the motor as a whole, particularly to reduce the thickness thereof. In the specific example, a substantially rectangular opening corresponding to a predetermined portion of the end wall 6 of the housing 2, specifically, each of the pole teeth 18 of the stator core 16.
42 is formed. Six openings 42 are formed at substantially equal intervals in the circumferential direction, and the size of these openings 42 is slightly larger than the outer shape of the amateur coil 20 wound around the corresponding pole tooth 18. There is. And a part of the amateur coil 20 wound around the pole tooth 18 (upper part in FIG. 2)
Are located within the corresponding openings 42. Therefore, the distance between the end wall 6 and the stator core 16 can be reduced as compared with the conventional one in which the entire amateur coil 20 is located inside the end wall 6, and it can be easily understood from FIG. as,
The overall size of the motor can be reduced, and particularly the thickness can be reduced (the vertical thickness in FIG. 2).

In the specific example, an insulating sheet member 44 is provided in order to increase the pressure resistance between the armature coil 20 and the housing 2. Referring also to FIG. 3 and FIG. 4, the sheet-shaped member 44 has an annular shape, and is provided with six substantially rectangular projections 46 at substantially equal intervals in the circumferential direction. The outer shape of the protrusion 46 corresponds to the shape of the opening 42 formed in the housing 2. The sheet-shaped member 44 is interposed between the armature coil 20 and the end wall 6 of the housing 2. That is, the protrusions 46 of the sheet-like member 44 are positioned in the corresponding openings 42, and the protrusions 46 are mounted so as to cover the corresponding amateur coils 20. Therefore, the sheet-shaped member 44 is interposed between the armature coil 20 and the end wall 6 and between the armature coil 20 and the outside, and sufficient insulation of the motor is secured. The sheet-shaped member 44 can be formed of, for example, a synthetic resin such as polyester.

The sheet-like member 44 is configured as follows so as to be fixed securely. That is, the sheet-shaped member 44 itself can be somewhat elastically deformed. When assembled as shown in FIG. 1 and FIG. 2, a part of the amateur coil 20 acts on the inner surface of the projecting portion 46 of the sheet-like member 44, and the plate-like portion of the sheet-like member 44 is caused by the amateur coil 20. The 48 is pressed against the inner surface of the end wall 6 of the housing 2. In the specific example, the inner wall portion of the protruding portion 46 is further provided with a protruding wall portion 50 that protrudes downward in FIG. 4 beyond the plate-shaped portion 48. The protruding wall portion 50 surely covers the inner portion of the amateur coil 20 to improve the withstand voltage of the motor.

Although one specific example of the motor according to the present invention has been described above, the present invention is not limited to this specific example, and various modifications and corrections can be made without departing from the scope of the present invention.

For example, in the illustrated specific example, the stator core 16 is attached to the inner peripheral surface of the side wall 4 of the housing 2 so that the stator core 16 is not exposed to the outside, but a part (outer peripheral surface) of the stator core 16 is exposed to the outside. It may be configured as follows.

[Brief description of drawings]

FIG. 1 is a plan view showing a specific example of a motor according to the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. FIG. 3 is a plan view showing a sheet-shaped member in the motor of FIG. FIG. 4 is a plan view showing the sheet-shaped member taken along line IV-IV in FIG. 2 …… Housing 12 …… Shaft member 14 …… Stator 18 …… Pole teeth 20 …… Amateur coil 22 …… Rotor magnet 26 …… Rotor yoke 36 …… Substrate 42 …… Opening 44 …… Sheet member

Claims (1)

[Scope of utility model registration request] 1. A housing, and pole teeth which are provided on the housing at intervals in a circumferential direction and project inward in a radial direction,
A motor including an armature coil wound around the pole teeth as required, a rotor rotatable relative to the housing, and a rotor magnet mounted on the rotor, wherein the housing includes the rotor A motor is characterized in that an opening is formed corresponding to each of the pole teeth, and a part of the armature coil wound around the pole tooth is located in the corresponding opening.