Magnetic disc drive motor

• US 5,241,229 A
• Filed: 05/29/1992
• Issued: 08/31/1993
• Est. Priority Date: 01/11/1990
• Status: Expired due to Term

• Current Assignee: Nidec Corporation
• Original Assignee: Sankyo Seiki Manufacturing Co., Ltd. (Nidec Corporation)
• Inventors: Kitajima, Kimio, Katakura, Koichi
• Primary Examiner(s): Stephan, Steven L.
• Assistant Examiner(s): LABALLE, CLAYTON E
• Application Number:
  US07/892,613
• Time in Patent Office: 459 Days
• Field of Search: 310/43, 310/45, 310/67 R, 310/51, 310/91, 360/98.07, 360/99.04, 360/99.08
• US Class Current: 310/51
• CPC Class Codes: G11B 19/2018 Incorporating means for passive damping of vibration, either in the turntable, motor or mounting
• CPC Class Codes: H02K 1/187 to inner stators
• CPC Class Codes: H02K 21/22 with magnets rotating around the armatures, e.g. flywheel magnetos
• CPC Class Codes: H02K 5/24 specially adapted for suppression or reduction of noise or vibrations

Abstract

A magnetic disc drive motor comprises a hub for carrying magnetic discs on its outer periphery, a drive magnet rigidly fitted to the inner periphery of the hub, a stator core having a coil wound around it and juxtaposed with the drive magnet and a motor frame having a substantially cylindrical holder for rigidly holding the stator core, wherein the space between the stator core and the motor frame is filled with a resin material. A compact and simply configured magnetic disc drive motor can thus be realized, which is capable of rotating magnetic discs in a very stabilized manner.

Claims

1. A magnetic disc drive motor comprises:

a hub for carrying magnetic discs on its outer periphery;

a drive magnet rigidly fitted to the inner periphery of said hub;

a stator core provided with a coil wound around it and juxtaposed with said drive magnet;

a motor frame having a substantially cylindrical holder for rigidly holding said stator core, said frame and stator core defining a space therebetween, which space is perpendicular to the axis of said cylindrical holder,; and

a resin material filling the space between said stator core and said motor frame;

said resin material being in direct contact with said coil, and said frame for providing vibration reduction for said motor.

2. The drive motor of claim 1 wherein said resin is a very hard epoxy resin.

3. The drive motor of claim 2 wherein said resin has a Shore hardness between D50 and 100.

4. The drive motor of claim 1 wherein the amount of resin filling the space between the stator and motor is sufficient to raise the frequency of vibrations in that portion of the motor so as to avoid deleterious vibration effects on motor operation and to reduce unreproducible oscillation without increasing the motor frame thickness.