JP2581385Y2 - motor - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor used in office or home electric equipment.

[0002]

2. Description of the Related Art A conventional micromotor of this type will be described with reference to FIG.

In FIG. 3, a micromotor includes a stator core 2 integrally formed with a resin frame 1, a coil 3 wound around the stator core 2, a bearing seat formed at the bottom of the frame 1, and an opening of the frame 1. An output shaft 7 rotatably supported by two ball bearings 5 attached to a housing 4 press-formed from a metal plate fitted to the rotor core 6 and having a rotor core 6 opposed to the stator core 1 fitted and fixed. Have been.

By the way, in the above configuration, during the injection molding, for example, the coil 3 falls down due to the injection pressure,
There is a problem in that the exposed portion is exposed to the inner peripheral surface of the housing 4 and approaches or comes into contact with the metal housing 4 to cause insulation failure.

Therefore, conventionally, a varnish treatment has been performed to solve the above problem. For example, the molding procedure of the frame 1 of the micromotor configured as described above is as follows. First, after winding the coil 3 around the stator core 2, the varnish is applied to solidify the coil 3, and then the injection molding machine is used. In addition, the molten resin is injected from the direction of the opening of the frame 1 to be integrally molded.

[0006]

However, the varnish treatment applied to the coil 3 not only requires a drying device, but also requires a long time for drying, complicates the operation, and increases the production cost. Was.

[0007] The object of the present invention is to solve the above-mentioned problems and to ensure stable quality without insulation failure in the coil.
It is an object of the present invention to provide an inexpensive motor that can perform the operation.

[0008]

In order to achieve the above object, a motor according to the present invention comprises a stator core and a stator core.
A) A resin formed by integrally molding a coil wound around
Frame and a metal housing fitted to this resin frame.
Supported by a bearing attached to the housing, and
Output with the rotor core fixed so as to face the core
In motor comprising a shaft, before the resin frame
Serial coil and a peripheral wall which is attached to the corner end portion formed at the other side from the inside of the coil between the said metal housing forms the substantially L-shaped cross section, and wherein the peripheral wall
A plurality of through holes are formed on the other side of the coil to protect the coil and bury a ring-shaped insulator that insulates the metal housing from the coil.

[0009]

[Function] In the present invention, the resin frame is molded.
Is applied from outside the coil during molding.
Depending on the shape pressure, the coil may fall, depending on how it falls
The insulation distance from the metal housing cannot be secured.
However, according to the above means, the coil
Ring-shaped insulator on the corner end formed on the other side from inside
To prevent the coil from collapsing.
As a result, a predetermined coil diameter can be maintained, and
Insulation failure due to proximity or contact with metal housing
Can be prevented.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of a miro motor according to the present invention, and FIG. 2 is a perspective view of an insulating ring of the embodiment.

In FIG. 1, the micromotor of the present embodiment is different from the conventional example shown in FIG. 3 in that an insulating ring 8 which is an insulator formed of a resin material is fitted to the upper end of the coil 3. And embedded in the frame 1. The other components are the same as those of the conventional example. In addition, the varnish process of the coil 3 is not performed.

As is apparent from FIG. 2, the insulating ring 8 has a peripheral wall substantially L-shaped in cross section, and
Formed on the other side from the inside of the housing 4 side
A plurality of through holes 8a, which are mounted at the corner end (upper inner end) and through which the molten resin passes during injection molding, are formed in front of the coil 3.
It is provided on the flange of the peripheral wall of the insulating ring 8 in contact with the other side .

The procedure for forming the frame 1 of the present embodiment is as follows. A coil 3 wound without applying a conventional varnish treatment is inserted into a stator core 2 to complete a stator. Is fitted with the insulating ring 8. Thereafter, the resin is injected into the stator using an injection molding machine, and the molding of the frame 1 is performed.

At the time of the molding, the insulating ring 8 can prevent the coil from collapsing due to the resin injection pressure from the outside of the coil 3, maintain a predetermined coil diameter, and provide a sufficient distance between the coil 3 and the housing 4. Even if you can not get
It is possible to prevent the housing 4 made of a metal material fitted into the inner diameter of the frame 1 from approaching or contacting with the coil 3, and the protection and insulation of the coil 3 are effectively achieved.

In this embodiment, the insulating ring 8 is not fitted to the lower side of the coil 3. However, in the configuration of this embodiment, a metal such as the housing 4 is provided near the lower end of the coil 3. Since there are no parts and a sufficient insulation distance can be secured, an insulator (insulation ring) is not required. But,
If the metal parts are close to each other and there is a risk that the insulation distance from the coil 3 cannot be ensured, it is necessary to use an insulator.

[0017]

[Effects of the Invention] As described above, according to the present invention,
Protection of the coil against the metal housing by the presence of the ring-shaped insulator, the insulation is good, without causing insulation failure, also varnish treatment for conventionally required coils
Is not required, the time can also be greatly reduced production, yet at the time of molding, because that can collapse coil by the resin injection pressure from outside of the coil in prevention by a ring-shaped insulator,
It is possible to provide an inexpensive motor that can maintain a predetermined coil diameter and has stable quality and high reliability .

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of a motor according to the present invention.

FIG. 2 is a perspective view of the insulating ring of FIG. 1;

FIG. 3 is a sectional view of a conventional micromotor.

[Explanation of reference numerals] 1 ... frame, 2 ... stator core, 3 ... coil,
4 ... housing, 5 ... ball bearing, 6 ... rotor core,
7 ... Output shaft, 8 ... Insulator (insulation ring).

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02K 5/08 H02K 3/34 H02K 3/50 H02K 15/12

Claims (1)

(57) [Scope of request for utility model registration] 1. A resin frame formed by integrally molding a stator core and a coil wound around the stator core, and a stator mounted on a metal housing fitted to the resin frame and supported by the stator core.
In a motor comprising an output shaft having a rotor core fixed so as to face each other, a corner between the coil and the metal housing of the resin frame is formed on the other side from the inside of the coil. The peripheral wall to be mounted has a substantially L-shaped cross section, and the coil on the peripheral wall has
A motor having a plurality of through holes formed on the other side to protect the coil and bury a ring-shaped insulator for insulating the metal housing and the coil.