KR900008918Y1 - Small sized motor - Google Patents

Abstract

No content.

Description

Small motor

1 is a partial cross-sectional side view of a small motor of an embodiment according to the present invention.

* Explanation of symbols for main parts of the drawings

1: motor case 2: shaft

7: rotor 10: commutator

11: bearing

The present invention is to obtain a small motor in which a stringent condition is given to the right angle of the shaft and the fixed surface of the motor and the concentricity of the shaft and the bearing portion, such as a motor for a compact disk drive, especially a compact disk drive. The present invention relates to a small motor which satisfies the above conditions while cutting or grinding polishing is performed on the motor fixed surface and the outer circumference of the bearing surface of the motor case.

BACKGROUND ART Small motors of permanent magnet fields have been widely used as drive motors for acoustic devices, optical devices, office equipment, and the like. Therefore, the application as a drive motor of a compact disc is considered.

As the motor for driving this compact disc, the degree of fixation of the motor to the apparatus is severely demanded, for example, 90 ° ± 6 ′ as a right angle between the shaft and the motor fixing surface, and a deviation from the concentricity between the shaft and the motor bearing part. The precision of 0.02 (mm) or less is calculated | required. On the other hand, the small-sized motor of a permanent magnet field has been press-molded by the drawing of a metal plate in the motor case conventionally from the viewpoint of mass productivity and cost reduction. Therefore, a proper method for coping with the above strict conditions is not noticeable, but inefficient, total inspection of mass-produced motors has been conducted to maintain the degree of selecting and using motors meeting the above conditions. In addition, the applicant of the present invention, which should improve the advantages, proposed a small motor having a spacer processed with high precision to secure the above desired conditions.

However, since the information on this spacer itself must be strictly enforced, it includes the problem of transcending the rise in production prices.

The object of the present invention is to solve the above problems, that is, the end surface of the motor case being formed by drawing processing (outside the bottom of the motor case with a base) and the outer circumferential surface of the bearing portion by cutting or grinding polishing, etc. By processing, it aims at obtaining the small motor which has said desired squareness and concentricity.

The above object of the present invention is clearly understood by the following description with reference to the following drawings.

In the figure, (1) is a motor, a case, (2) is a shaft, (3) is a motor fixed surface, and the motor is subjected to the processing of the present invention, the case bottom outer surface, (4) is an outer peripheral surface of the bearing portion, (5) is a motor terminal, (6) is a permanent magnet field, (7) is a rotor, (8) is a brush, (9) is a case cover, (10) is a commutator, (11) The silver bearing, 12 is a terminal insulated tube, 13 is a motor fixed external equipment surface, and 14 is a small screw.

Since the structure of the motor shown in figure is substantially the same as that of a conventionally well-known, detailed description is abbreviate | omitted, but the rotor 17 is supported by the bearing 11 and 11 so that rotation is possible.

Therefore, in the case of the small-sized motor of the present invention, processing is performed on a motor in a state of a semi-finished product in which the bearing 11 is assembled to the motor case 1 in the finished product or the manufacturing process of the mass-produced product manufactured by the normal process. .

Any standard values described at the beginning of the above specification are based on the axis 2.

There, the shaft 2 of the motor of the finished or semi-finished product is fixed to the jig, and at the same time, the motor circumferential surface 3 and the outer peripheral surface 4 of the bearing part in the motor case 1 on the basis of the fixed shaft 2 ) Is processed. Processing is performed by cutting or grinding polishing. That is, since the motor fixing surface 3 becomes a motor fixing surface for external equipment such as a compact disk, the machining is performed so that the right angle with the shaft 2 is maintained within and the surface perpendicular to the shaft 2 is obtained. All. Moreover, the outer peripheral surface 4 of a bearing part is processed so that the concentricity with the shaft 2 may obtain desired concentricity of 2.02 mm or less of deviation.

As described above, according to the present invention, a motor having a desired mounting precision for an external device can be obtained only by processing the motor manufactured by mass production. Therefore, it is possible to provide a driving motor such as a compact disk at a relatively low cost, and furthermore, since the spacer is unnecessary, the thickness of the motor can be reduced.

Claims (3)

In a small motor having a pedestal cylindrical motor case and a rotor supported by one of the shafts by a bearing portion provided at the bottom of the motor case, the rotor being rotatably supported in the motor case. A small motor, characterized in that the bottom outer surface and the outer circumferential surface of the bearing portion are formed by cutting or grinding polishing, and configured such that the bottom outer surface of the motor case and the shaft substantially cross at 90 °. The miniature motor according to claim 1, wherein the bottom outer surface of the motor case includes a small screw hole that allows the small screw to be engaged therein. The small motor according to claim 1, wherein the bottom outer surface of the motor case is subjected to processing on the basis of the shaft center of the shaft.