Magnetic disk drive start procedure for starting reaction torque

Details Magnetic disk drive start procedure for starting reaction torque Magnetic disk drive start procedure for starting reaction torque

1988-10-04

1990-11-13

Tupper, Robert S.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 9807, 360 7303, G11B 2102

Patent

active

049706101

ABSTRACT:
A magnetic disk drive spindle motor start routine is provided that supersedes the spindle motor primary motor control when a stuck condition, wherein one of more transducer heads are adhered to the disk surface, is found to exist at start. The motor is provided current pulses at the resonant frequency of the worst case stuck system with the sequence limited to a number of pulses that will not cause the torque amplification to exceed a value that would damage the head/suspension assemblies. In another embodiment, the stuck system is provided with a motion sensor to sense positive and negative motion during oscillation of the stuck system and provide current to the motor when motion is positive to effect torque amplification.

REFERENCES:
patent: 4542429 (1985-09-01), Nishida et al.
patent: 4833550 (1989-05-01), Takizawa et al.
Disk File Soft Starting (Controlled Initial Acceleration) Research Disclosure, Nov. 1984, No. 247.

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