JPH0670478U - Brushless DC motor - Google Patents

Abstract

(57) [Abstract] [Purpose] To simplify the manufacturing process in a brushless DC motor. [Configuration] Base metal fitting 1 for brushless DC motor
The bearing unit portion such as the radial bearing portion 9 and the thrust bearing portion 11 has a three-dimensional molding circuit integrally formed on the motor mounting surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention mainly relates to a method for assembling and mounting a brushless DC motor used as a driving motor for a headphone stereo.

[0002]

[Prior art]

 FIG. 3 shows an example of the structure of the rotary yoke type brushless DC motor. When assembling the motor, the radial bearing 9, the bearing holder 10, and the thrust bearing portion 11 are first assembled as a bearing unit, and this bearing unit is fixed to the base metal fitting 1 by caulking or the like. The coil holder 2 made of resin is attached to the metal fitting 1. Next, the magnet holder 5 holding the magnet 4 is attached to the rotary metal fitting 6 in which the shaft 7 is press-fitted by a method such as bonding, and the shaft 7 is inserted into the bearing unit. Next, the plate coil 3 is adhered to the coil holder 2, and finally the rotary yoke plate 8 is attached to the rotary metal fitting 6 to complete the assembly.

The motor is attached to the board or the like by using screw holes provided in the base metal fitting 1.

[0004]

[Problems to be Solved by the Invention] The process of assembling a brushless DC motor requires many steps and is complicated, which causes a rise in the manufacturing cost of the finished motor.

The motor is mounted on the substrate or the like by fastening with screws at two or more locations because of its certainty, which is a labor-intensive process.

There is a problem such as

[0007]

[Means for Solving the Problems] A brushless DC motor has a motor mounting surface on which a bearing unit portion including a base metal fitting, a radial bearing portion, a thrust bearing portion, and the like is integrally formed.

Further, the base metal fitting of the DC motor, the radial bearing portion, and the thrust bearing portion are integrally formed by insert molding on the motor mounting surface.

[0009]

[Action]

 In the brushless DC motor, by adopting a three-dimensional molded circuit in which the base metal fitting and the bearing unit are integrally molded on the motor mounting surface, the number of motor components is reduced, the manufacturing process of the brushless DC motor is simplified, and the cost is reduced. Can be realized.

[0010]

【Example】

 FIG. 1 shows an example of a three-dimensional molded circuit integrated motor base embodying the present invention. The base metal fitting 1 is made of a ferromagnetic material such as iron, and is partly embedded in the motor mounting surface of the resin part of the three-dimensional molded circuit by insert molding and the coil holder 2 which is integral with the motor mounting surface. It is fixed. Further, the radial bearing portion 9 and the thrust bearing portion 11 are also fixed by a part of the motor mounting surface by insert molding as shown in FIG.

In order to complete the motor base with the three-dimensional circuit integrated type formed as described above, as shown in FIG. 2, a magnet holder in which a magnet 4 is held in a rotating metal fitting 6 into which a shaft 7 is press fitted. The rotary unit to which 5 is adhered and fixed is attached to the three-dimensional circuit integrated motor base. The mounting is completed by inserting the shaft portion of the rotary unit into the bearing portion 9 of the motor base, and the attraction force of the magnet 4 and the base metal fitting 1 works. Next, the plate coil 3 is adhered to the coil holder 2, and finally the rotary yoke plate 8 is attached to the rotary metal fitting 6 to complete the motor fixed to the three-dimensional circuit.

[0012]

[Effect of device]

 In the present invention, the coil holder of the brushless DC motor is integrated with the mounting surface of the motor, so that the number of motor components is reduced by one and the base metal fitting and the bearing unit can be removed from the motor components. . As a result, the structure of the motor body is composed of only the plate-shaped coil and the movable parts such as the rotating metal fittings and the shaft, which is simplified and the cost can be reduced. Furthermore, since the base metal fitting is embedded and fixed in the motor mounting surface, the step of fastening at two or more points with screws is not required.

[Brief description of drawings]

FIG. 1 is a plan view (a) and a sectional view (b) of a motor base of the present invention.

FIG. 2 is a diagram illustrating the relationship between the motor base and the motor body of the present invention.

FIG. 3 is a plan view (a) and a sectional view (b) of a conventional motor.

[Explanation of symbols]

 1 Base Metal Fitting 2 Coil Holder 3 Plate Coil 4 Magnet 5 Magnet Holder 6 Rotating Metal Fitting 7 Shaft 8 Rotating Yoke Plate 9 Radial Bearing 10 Bearing Bearing 11 Thrust Bearing

Claims (2)

[Scope of utility model registration request] 1. A brushless DC motor having a motor mounting surface on which a base metal fitting and a bearing unit portion including a radial bearing portion, a thrust bearing portion and the like are integrally formed. 2. The brushless DC according to claim 1, wherein a bearing unit portion including a DC motor base metal fitting, a radial bearing portion, a thrust bearing portion and the like is integrally formed on the motor mounting surface by insert molding. motor.