Electricity: motive power systems – Switched reluctance motor commutation control
Patent
1995-06-06
1997-05-27
Ip, Paul
Electricity: motive power systems
Switched reluctance motor commutation control
318560, 318634, 360 7801, 360 69, G11B 2108
Patent
active
056335687
ABSTRACT:
A spindle motor operates dynamically in one of two modes for a disc drive. During power-up, the disc drive electronics are configured to operate the motor in a line-to-line configuration, thus assuring generation of adequate torque. An operating condition circuit senses when the motor has attained substantially the desired running velocity .omega., after which, the drive electronics are dynamically reconfigured to operate the spindle motor in a line-to-neutral mode. A power interruption circuit senses when the source power supply V.sub.cc voltage level is too low or turned off, thereafter initiating a reconfiguration back to line-to-line mode, wherein the highest voltage pair of motor windings are electrically held across the source power supply V.sub.cc lines. Simultaneously, a switching circuit electrically connects the V.sub.cc lines across the transducer positioning voice coil motor in the disc drive, thereby delivering current from the spindle motor to the voice coil. Because only one spindle motor winding is powered during normal operation, a back EMF voltage may be developed in a single winding to a level to just below the source power supply V.sub.cc level while still able to maintain motor operation. The reconfiguration to line-to-line mode allows for the series connection of two windings, necessarily contributing the back EMF energy from a pair of windings to the voice coil providing sufficient energy to cause the voice coil motor to park the transducer in a designated disc landing zone or on a ramp.
REFERENCES:
patent: 4565957 (1986-01-01), Gary et al.
patent: 4641090 (1987-02-01), Danby
patent: 4724503 (1988-02-01), Libert
patent: 4866554 (1989-09-01), Stupeck et al.
patent: 4939600 (1990-07-01), Desai et al.
patent: 5045811 (1991-09-01), Lewis
patent: 5402200 (1995-03-01), Shrinkle et al.
patent: 5442266 (1995-08-01), Morehouse et al.
patent: 5491391 (1996-02-01), Bahr et al.
patent: 5506487 (1996-04-01), Young et al.
patent: 5521768 (1996-05-01), Shrinkle et al.
Principles of Power Electronics; John G. Kassakian, Martin F. Schlecht, George C. Verghese; 1991; pp. 190-191.
Ip Paul
Seagate Technology Inc.
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