Claw-pole synchronous motor for driving a storage device

Details Claw-pole synchronous motor for driving a storage device Claw-pole synchronous motor for driving a storage device

1997-06-12

1999-02-23

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Record transport with head stationary during transducing

Disk record

360 9905, G11B 5016

Patent

active

058750690

ABSTRACT:
There is provided a storage device whose cost is greatly reduced by employing a low-cost claw-pole two-phase synchronous motor as a spindle motor in which the rotation nonuniformity and vertical fluctuation of its shaft are suppressed while suppressing the leakage magnetic flux, by employing an open-loop scheme for motor control, and by mounting a drive circuit on the side of a control LSI for controlling the device to omit a motor control drive circuit (driving IC). The number of basic steps of the claw-pole two-phase synchronous motor is set to 48 steps or more. Stator pole teeth between both sub-assemblies are located within the range of 90.degree..+-.5.degree. in electrical angle. One end surface of a rotor having a field magnet is subjected to index magnetization also serving as rotor chuck magnetization. A magnetic shield plate is arranged on the surface of the rotor opposite to the magnetic head. The claw-pole two-phase synchronous motor having the above arrangement is used as a spindle motor, thereby realizing a low-cost storage device having a simple motor drive circuit by open-loop control.

REFERENCES:
patent: 5304879 (1994-04-01), Suzuki
patent: 5691583 (1997-11-01), Suzuki

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