Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1976-02-19
1978-02-07
Schaefer, Robert K.
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318608, 318439, H02P 500
Patent
active
040728846
ABSTRACT:
The speed and direction of rotation of an electronically commutated brushless D.C. motor is controlled by utilizing a resolver to provide both phase locked servo feedback and motor commutation. The resolver in response to orthogonal signal voltages on its primary coils, provides a signal whose phase is a function of the motor shaft angle. A phase detector provides a signal whose phase varies in accordance with the difference between the phase of the signal from the resolver and the phase of a reference signal. The reference signal phase varies in a predetermined manner as a function of time dependent upon the desired shaft speed and direction of rotation. The phase detector output signal is then used to amplitude modulate the signal from the resolver. The amplitude modulated signal is then demodulated with respect to the orthogonal signal voltages so as to provide signals to energize the control coils of the motor.
REFERENCES:
patent: 3050668 (1962-08-01), Pease et al.
patent: 3359499 (1967-12-01), McDonough
patent: 3395326 (1968-07-01), Hebb
patent: 3423523 (1969-01-01), Kosugi et al.
patent: 3462663 (1969-08-01), Schiller
patent: 3495152 (1970-02-01), Keiser et al.
patent: 3828234 (1974-08-01), Goldberg
patent: 3839665 (1974-10-01), Gabor
Christoffersen H.
Indyk Eugene S.
Lazar Joseph D.
Norton Edward J.
RCA Corporation
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