Method of controlling a start-up of a motor used for a disk appa

Details Method of controlling a start-up of a motor used for a disk appa Method of controlling a start-up of a motor used for a disk appa

1995-02-07

1997-04-22

Psitos, Aristotelis

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the record

360 7303, 324226, 73862193, 318254, G11B 1548

Patent

active

056233795

ABSTRACT:
A method of controlling start-up of a sensorless spindle motor used in a disk apparatus reduces time spent on start-up of a spindle motor with high reliability. The motor is used for rotating a disk on which information is recorded, and no sensor is provided in the motor for sensing an angular position of a rotor relative to a stator of the motor. The motor is operated at a steady rotational speed and is stopped by supplying a stop command. An aligning operation is performed immediately after the motor is stopped. The aligning operation is performed to rotate the rotor to a predetermined angular position relative to the stator of said motor. The motor is operated at a steady speed by a synchronization control when operation of the motor is started by supplying a start command.

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patent: 5493188 (1996-02-01), Yoshikawa
"Disk File Soft Starting (Controlled Initial Acceleration)" Research Disclosure, Nov., 1984, No. 247 Kenneth Mason Publications Ltd, England.

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