Dynamic magnetic information storage or retrieval – Automatic control of a recorder mechanism – Controlling the record
Patent
1989-03-09
1990-10-23
Faber, Alan
Dynamic magnetic information storage or retrieval
Automatic control of a recorder mechanism
Controlling the record
360 7309, 388810, G11B 19247, H02P 506
Patent
active
049656821
ABSTRACT:
A speed control device for controlling the speed of an electric motor for rotating a recording medium by a feedback control system including a proportion term proportional to information on a deviation of the speed of the motor from a speed set value and an integration term obtained by integrating the information of the deviation with respect to time. The value of the difference between a stationary term obtained when the head is loaded on the recording medium and a stationary term obtained when the head is unloaded is previously memorized about each of head load positions. Depending on the head load position, the memorized corresponding stationary term is supplied to the feedback control system, whereby the speed of the motor is maintained constant despite a change in the load.
REFERENCES:
patent: 4580084 (1986-04-01), Takahashi et al.
patent: 4816937 (1989-03-01), Fukushima
Fukushima Nobuo
Jinnai Shigeru
Canon Kabushiki Kaisha
Faber Alan
Robertson David L.
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