Dynamic information storage or retrieval – Information location or remote operator actuated control – Selective addressing of storage medium
Patent
1995-12-22
1997-01-28
Dinh, Tan
Dynamic information storage or retrieval
Information location or remote operator actuated control
Selective addressing of storage medium
369 4428, G11B 1722
Patent
active
055983847
ABSTRACT:
A phase shifting device including multipliers, a table and first adders, generates and outputs first shifted phase data and second shifted phase data obtained by shifting first feed phase data and second feed phase data as much as a phase displacement from a rising zero cross point in a last cycle of the first feed phase data to a target position. A counting device counts down upon every rising zero cross point of the first shifted phase data as many as the number of revolutions of a motor up to the target position, and then activates a brake mode at the next falling zero cross point of the first shifted phase data. In the brake mode, a controlling device feed-controls so as to converge at a rising zero cross point of the first shifted phase data after the end of the counting, through a second adder, a limiter, a loop filter, and a third adder.
REFERENCES:
patent: 4727530 (1988-02-01), Tomisawa
patent: 4803675 (1989-02-01), Komatsu
patent: 4847821 (1989-07-01), Baas
patent: 5050146 (1991-09-01), Richgels et al.
patent: 5140570 (1992-08-01), Nagasawa et al.
patent: 5446708 (1995-08-01), Takebayashi et al.
Aoshima Shinji
Morishima Morito
Dinh Tan
Yamaha Corporation
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