Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1986-10-22
1989-04-04
Shoop, Jr., William M.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318318, 318138, 318254, 74 56A, 74 57, H02K 2900, G01C 1928
Patent
active
048189227
ABSTRACT:
The present invention deals with an apparatus and method for starting and running permanent magnet motors based on angular position information using an optical commutation technique. The optical commutation technique provides rotor position information at rest and while rotating for two-phase driving of a motor having a permanent magnet rotor. The angular position information is extracted by optical detectors, consisting of a light source and an optical sensor for detecting an optical pattern formed on the gyro rotor. The optical pick off associated with one phase is used to commutate the other phase. The optically detected signal output is converted to a frequency signal which is proportional to wheel speed. The frequency signal is converted to a voltage signal which is compared to a speed command signal in a feedback loop to generate the required drive. Alternately the frequency can be inputted to a phase lock loop circuit and compared with a speed reference clock frequency to generate the required drive signal level.
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Kluss Walter
Parfomak Walter
Sears Jerome
Allied-Signal Inc.
Ip Paul
Massung Howard G.
Shoop Jr. William M.
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