Electricity: motive power systems – Positional servo systems – Pulse-width modulated power input to motor
Patent
1997-08-05
1999-11-16
Masih, Karen
Electricity: motive power systems
Positional servo systems
Pulse-width modulated power input to motor
360 7301, 360 7303, 369 54, 318432, 388811, 388819, G05B 1128
Patent
active
059864265
ABSTRACT:
A motor control method and apparatus for spindle motor control and for voice coil motor (VCM) control in a direct access storage device (DASD). Characteristics of the pulse width modulation (PWM) waveform are adapted to allow tradeoffs to be made between lower noise emission, greater power efficiency, and current ripple in the motor in order to optimize the driver operation. The transition rate of the PWM waveform is modified by changing the "off-time", which is maintained as a constant in a control register, in response to a change in the condition or mode of operation of the DASD. The "slew rate" of the PWM waveform is also controlled by a changing the value of a constant stored within the control register and can be modified in response to changes in the condition or operational mode of the DASD. In addition, in accordance with the present invention, the current that flows through the spindle motor windings during commutations is controlled by pulsing the power amplifier drive circuit at a relatively high rate in order to maintain a relatively constant total current through the windings of the motor, thus reducing acoustic noise. Thus, mechanical vibrations which result in acoustic noise are prevented or suppressed.
REFERENCES:
patent: Re34399 (1993-10-01), Gami et al.
patent: 4249116 (1981-02-01), Hieda
patent: 4359674 (1982-11-01), Gotou
patent: 4371818 (1983-02-01), Lewis
patent: 4383209 (1983-05-01), Lewis
patent: 4393339 (1983-07-01), Kimura
patent: 4491771 (1985-01-01), Kimura
patent: 4647828 (1987-03-01), Wachi
patent: 4749927 (1988-06-01), Rodal et al.
patent: 5161073 (1992-11-01), Gami et al.
patent: 5193146 (1993-03-01), Kohno
patent: 5204594 (1993-04-01), Carobolante
patent: 5210474 (1993-05-01), Oswald
patent: 5241251 (1993-08-01), Wakui
patent: 5246479 (1993-09-01), Gami et al.
patent: 5289097 (1994-02-01), Erickson et al.
patent: 5296789 (1994-03-01), Ohi
patent: 5307439 (1994-04-01), Enami
patent: 5444582 (1995-08-01), Suzuki
patent: 5517095 (1996-05-01), Carobolante et al.
patent: 5550446 (1996-08-01), Schlager et al.
patent: 5631887 (1997-05-01), Hurst, Jr.
patent: 5780986 (1998-07-01), Shelton et al.
International Business Machines - Corporation
Masih Karen
LandOfFree
Adaptive pulse width modulated motor control does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Adaptive pulse width modulated motor control, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adaptive pulse width modulated motor control will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1328812