Electricity: motive power systems – Reciprocating or oscillating motor – Energizing winding circuit control
Patent
1990-12-19
1993-11-02
Shoop, Jr., William M.
Electricity: motive power systems
Reciprocating or oscillating motor
Energizing winding circuit control
318439, 318778, 360 48, 360 51, H02P 540
Patent
active
052586952
ABSTRACT:
A spin motor control system includes a BEMF commutation circuit, a startup circuit and a monitor circuit, each of which operate utilizing digital techniques. The BEMF commutation circuit includes first and second counters that are programmable to accommodate for changing system parameters. The BEMF commutation circuit does not require the incorporation of an external capacitor, is insensitive to leakage current, and provides stable timing characteristics. The startup circuit also includes a counter and is programmable to accommodate for changing system parameters. The startup circuit does not require an external capacitor and provides stable generation of the startup pulses. The monitor circuit includes first and second counters for blanking the BEMF circuitry after commutation. The monitor circuit further includes circuitry for detecting and correcting the direction of rotation of the spin motor. The monitor circuit provides a microprocessor interface to allow for changing motor parameters and environmental conditions, eliminates the requirement of a capacitor, and provides stable timing characteristics.
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"Quantum Low Power Products: Go Drive 21/2-inch Hard Disk Drives--ProDrive Gem Series 31/2-inch Small Frame Devices--Technical Highlights", Sep. 1990.
Blagaila John H.
Utenick Michael R.
Cabeca John W.
Integral Peripherals, Inc.
Shoop Jr. William M.
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