JPH0541365U - motor - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent the occurrence of insulation failure in the coil and to reduce the cost. [Structure] A coil 3 in a wound state, which is not subjected to varnish treatment, is inserted into a stator core 2 to complete a stator, and an upper end portion of the coil 3 on a metal housing 4 side for supporting an output shaft 7 is provided. After fitting the insulation ring 8,
Resin is injected into the stator to mold the frame 1. The insulating ring 8 is a coil 3 formed by resin injection pressure.
Coil 3 and metal housing 4 to prevent
Even if a sufficient distance is not provided between the two, it is possible to prevent the two from approaching or contacting each other.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a motor used in an electric appliance for home or office use.

[0002]

[Prior Art]

 A conventional micromotor of this type will be described with reference to FIG.

In FIG. 3, a micromotor comprises a coil 1 wound around a stator core 2 and a stator core 2 integrally formed with a resin frame 1, a bearing seat formed at the bottom of the frame 1, and an opening of the frame 1. Output shaft 7 rotatably supported by two ball bearings 5 respectively mounted on a housing 4 press-molded from a metal plate fitted to the above-mentioned portion, and a rotor core 6 facing the stator core 1 is fitted and fixed. It consists of and.

By the way, in the above configuration, during injection molding, for example, the injection pressure causes the coil 3 to fall inward, so that the coil 3 is exposed at the inner peripheral surface where the housing 4 is fitted, and approaches the metal housing 4. Alternatively, there is a problem in that the contact may result in poor insulation.

Therefore, conventionally, a varnish treatment has been performed in order to solve the above problems. For example, the procedure for molding the frame 1 of the micromotor configured as described above is as follows. First, the coil 3 is wound around the stator core 2, then varnish is applied to solidify the coil 3, and then the injection molding machine is used. Then, the molten resin was injected from the direction of the opening of the frame 1 to integrally mold the resin.

[0006]

[Problems to be solved by the device]

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

An object of the present invention is to solve the above problems and to provide an inexpensive motor that does not cause insulation failure in the coil.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the motor of the present invention protects the coil between a coil of a resin frame, which is not subjected to varnish treatment, and the metal housing, and also provides insulation between the metal housing and the coil. It is characterized by embedding an insulator.

[0009]

[Action]

 According to the above-mentioned means, the coil can be protected and insulated from the metal housing by the insulator without performing the varnish treatment of the coil.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the mylo motor according to the present invention, and FIG. 2 is a perspective view of an insulating ring of the present 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 is embedded in the frame 1. Others are the same as in the conventional example, and therefore, the same components are designated by the same reference numerals and the description thereof is omitted. The varnish treatment of the coil 3 is not performed.

In FIG. 2, the insulating ring 8 has an L-shaped cross-sectional shape, and a plurality of through holes 8a through which the molten resin passes during injection molding are provided in the flange portion.

The procedure for forming the frame 1 of this embodiment is as follows. The coil 3 in a wound state without the conventional varnish treatment is inserted into the stator core 2 to complete the stator. The insulating ring 8 is fitted to the portion. After that, resin is injected into the stator using an injection molding machine, and the frame 1 is molded.

At the time of molding, the insulating ring 8 can prevent the coil from collapsing due to resin ejection pressure from the outside of the coil 3, can maintain a predetermined coil diameter, and can sufficiently prevent the coil 3 and the housing 4 from being damaged. Even if the distance is not secured, it is possible to prevent the housing 4 made of a metal material fitted to the inner diameter of the frame 1 from approaching or coming into contact with the coil 3, and effectively protecting and insulating the coil 3. become.

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

[0017]

[Effect of the device]

 As described above, according to the present invention, the presence of the insulator improves the protection and insulation of the coil with respect to the metal housing, does not cause the insulation failure, and does not require the conventional varnish treatment for the coil. Since no equipment is required and the production time can be greatly shortened, a reliable and inexpensive motor can be obtained.

[Brief description of 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.

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

[Explanation of symbols]

1 ... Frame, 2 ... Stator core, 3 ... Coil,
4 ... Housing, 5 ... Ball bearing, 6 ... Rotor core,
7 ... Output shaft, 8 ... Insulator (insulating ring).

Claims (1)

[Scope of utility model registration request] 1. A resin frame integrally formed with a stator core and a coil wound around the stator core, and an output shaft supported by a bearing mounted on a metal housing fitted to the resin frame and having a rotor core fixed thereto. In the motor, the motor is characterized in that an insulator is embedded between the coil of the resin frame and the metal housing to protect the coil and to insulate the metal housing.