Electricity: motive power systems – Positional servo systems – With particular motor control system responsive to the...
Patent
1996-03-05
1998-04-14
Ro, Bentsu
Electricity: motive power systems
Positional servo systems
With particular motor control system responsive to the...
H02P 822
Patent
active
057396612
ABSTRACT:
A stepping motor driver drives, for example, a stepping motor incorporated into an optical recording/reproducing apparatus to move an optical pickup in the radial direction of an optical disk during a seek operation. A current measuring device measures a current flowing through the stepping motor, and a control circuit changes the excitation phase of the stepping motor on the basis of the variation of the current detected by the current measuring device.
REFERENCES:
patent: 4370065 (1983-01-01), Kawamura et al.
patent: 4383209 (1983-05-01), Lewis
patent: 4431955 (1984-02-01), Faedi et al.
patent: 4683409 (1987-07-01), Boillat
patent: 4868478 (1989-09-01), Hedlund et al.
Alps Electric Co. ,Ltd.
Ro Bentsu
Shoup Guy W.
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