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公开(公告)号：DE2966861D1
公开(公告)日：1984-05-03
申请号：DE2966861
申请日：1979-12-04
Applicant: IBM
Inventor： HERALD ROBERT FREDERICK , WILSON MELVIN GEORGE
Abstract: Control apparatus for an electrical stepping motor having its rotor mechanically connected to drive a transducer carriage of a magnetic disk drive machine, includes a transistor which is responsive to the voltage across the stator coils of the stepping motor and initiates the controlled discharging of a capacitor. The charge on the capacitor is effective through transistor control circuits when the capacitor has discharged to a predetermined level to short all of the stator coils, except the one to which an energizing voltage is applied to attract and hold the rotor in its target position, so as to brake the rotor as the rotor approaches its target position on a return movement after the rotor initially passes across its target position.
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2.发明专利
公开(公告)号：DE3370212D1
公开(公告)日：1987-04-16
申请号：DE3370212
申请日：1983-09-20
Applicant: IBM
Inventor： DIX GARY LEE , HEIM LLOYD STEPHEN , HERALD ROBERT FREDERICK , QUINLAN WILLIAM PATRICK
Abstract: Error information is passed across a limited interface (10) from a disk drive to its using system by making use of the read data line during a fault mode operation. Fault mode operation is detected by a pulse width detector (46) in an adapter between the using system and the disk drive. The pulse width detector detects the presence of a fault signal on the read data line and inhibits the passage of the spindle motor on (MTR ON) signal from the using system to the disk drive. The step signal (STEP) normally used to index the recording head is passed to the disk drive during fault mode operation. A microcomputer (30) at the disk drive detects the absence of the MTR ON signal and the presence of the step signal and outputs a fault data bit. Thereafter, the fault data word is gated onto the read data line at the rate of one bit per step so long as the MTR ON signal is absent.
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