Stepper motor magnetic hysteresis correction using a stepping al

Details Stepper motor magnetic hysteresis correction using a stepping al Stepper motor magnetic hysteresis correction using a stepping al

1987-08-14

1988-08-30

Cardillo, Raymond F.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

318696, G11B 555, G11B 2108, G05B 1940

Patent

active

047681152

ABSTRACT:
The magnetic hysteresis or magnetic memory error in a stepper motor is erased by sequencing the motor phases in a particular manner. In positioning a transducer by energizing selected phases of the stepper motor, the sequence is selected to eliminate the memory of the previous stepper motor position, and reinforce only the new position. This cancellation is achieved by activating the stepper motor to move a transducer from a given track position to an adjacent track position, the sequence of energization of the phases including at least one reversal of the magnetic sense of each phase that was energized to position the transducer at the initial track, but that is not to be energized at the target track; further, the phases not energized at the initial track but that are energized at the target track are reinforced by the selective energization during more than one of the steps used for reaching the target track.

REFERENCES:
patent: 4437049 (1984-03-01), Tullos et al.
patent: 4489259 (1984-12-01), White et al.
patent: 4490662 (1984-12-01), Moribe et al.
patent: 4612588 (1986-09-01), Tsukahara
patent: 4691153 (1987-09-01), Nishimura
patent: 4703242 (1987-10-01), Kumazawa et al.

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