Brushless motor

A technology of brushless motors and motors, applied in the direction of electric components, electrical components, electromechanical devices, etc., can solve problems such as difficulty in implementation, difficulty in ensuring connection strength, and impractical fixation of bonding methods, so as to prevent splashing, cheap components, and The effect of improving convenience

Inactive Publication Date: 2008-05-07
MINEBEA MOTOR MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] The bearing holding mechanism shown in Fig. 14 is also the same as the example shown in Fig. 13. The fixing by welding is difficult to implement due to its structure limitation, and the fixing by bonding is because of fear that the adhesive will flow to the motor mounting plate. below and cannot be implemented
[0015] In short, it can be clearly understood that with the miniaturization and thinning of motors, it is difficult to ensure the connection strength only by press-fitting.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0041] As shown in FIG. 1 , a brushless motor 11 is composed of a rotor assembly and a stator assembly. The rotor assembly consists of a rotor frame 2 with a shaft 1 fixed in the center, and a rotor mounted on the inner peripheral side of the rotor frame 2 . The magnet 3 and the fastening part 4 installed on the fixed part of the above-mentioned shaft 1 on the top surface of the rotor frame case 2 are constituted; the stator assembly is composed of a bearing 8 that freely rotatably supports the above-mentioned shaft 1, and the bearing 8 is held on the The cylindrical bearing housing 9 on the inner peripheral side, the motor mounting plate 10 fixedly holding the bearing housing 9 at the center by press fitting or the like, the stator core 6 mounted on the outer peripheral side of the bearing housing 9, and the gasket A coil 7 wound by insulating members 5 a and 5 b mounted on the surface of the stator core 6 and a fall-off prevention member 5 mounted on the stator core 6 are con...

Embodiment 2

[0048] 9, 10(a), and 10(b) show a brushless motor of the present invention (Example 2).

[0049] As shown in FIG. 9 , the brushless motor includes a rotor portion 33 and a stator portion 40 .

[0050] The rotor part 33 has: a turntable part 28 for placing the disc, a rotor frame case 29, a disc alignment member 30 supporting the disc together with the turntable part 28, a rotor magnet 31 mounted on the rotor frame case 29, And the shaft 1 fixed to the center of the above-mentioned rotor frame case 29 .

[0051] The stator part 40 has: a bearing 8 supporting the above-mentioned shaft 1, a bearing housing 9 holding the bearing 8, an axial thrust stopper 36 supporting the shaft 1 in the axial direction, and a coil wound with a rotor magnet 31 opposite to the above-mentioned rotor magnet 31. 37 iron core 38, and the motor mounting plate 10 holding the above-mentioned bearing housing 9.

[0052] The bearing housing 9 is integrally formed into a substantially cylindrical shape, an...

Embodiment 3

[0056] Fig. 11(a) and Fig. 11(b) show Embodiment 3 of the present invention.

[0057] In Fig. 9, the bottom of the recessed part 10a of the motor mounting plate 10 is flat, and the base end of the bearing housing 9 is fitted in the recessed part 10a only by its outer circumference, but in this embodiment, the difference from it (Example 2) is only A groove 41 into which the proximal end of the bearing housing 9 fits is formed at the bottom of the recessed portion 10a. Other configurations of the brushless motor are the same as in FIG. 9 .

[0058] Specifically, as shown in FIG. 11( a ), a groove 41 is integrally provided on the bottom surface of the recess 10 a formed on the motor mounting plate 10 . The axial thrust baffle 36 is provided on the inner side than the groove 41 .

[0059] In addition, as shown in FIG. 11( b ), protrusions 42 at several positions are formed in the groove 41 so as to have a height lower than the inner diameter side wall surface 43 of the fitting ...

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Abstract

An brushless motor, which use bearing and bearing shell rotatable support the axes of roter on the dish driving mchanism of motor panel of the stator, the character is that, the bearing shell mold as barrel-type which in the internal circumstance of the bearing, and support the butt end on the said motor panel; freely revolve support the end panel of axile of the said bearing, immediacy touch the motor panel or separate by the axial thrust baffle, so as to get axis supporting.

Description

[0001] The patent application for the present invention is a divisional application of the patent application for invention with the application number 200510084461.2, the application date being July 8, 2005, and the name "brushless motor". technical field [0002] The present invention relates to a brushless motor for rotating discs such as CD (Compact Disc), DVD (Digital Versatile Disc), and MD (MiniDisc). Background technique [0003] Conventionally, in order to prevent the rotor from falling off when a force exceeding the magnetic attraction force between the rotor magnet and the stator core acts on the motor due to impact or the like, brushless motors have been provided with a structure to prevent falling off. As the structure for preventing falling off, generally adopt a structure in which an engaging portion is provided on the bearing housing, a falling-off preventing member is provided on the rotor portion facing the bearing housing, and the two are engaged (refer to,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02K5/16G11B19/20
Inventor 西方俊之久山浩二冲永钦二郎益田久光男池野弘志加纳刚
Owner MINEBEA MOTOR MFG
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