Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Patent
1979-06-05
1983-04-19
Smith, Jr., David
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
318318, 318327, H02P 516
Patent
active
043807232
ABSTRACT:
A servo circuit for electronically controlling the operation of an electric motor is disclosed. The rotational frequency of the motor is converted into a varying frequency waveform by a tachometer. The tachometer output is applied to a conversion circuit which includes a peak detector that converts the output waveform of the tachometer into a square-wave signal. The square-wave signal is, in turn, connected to one input of an exclusive-OR gate. The peak detector square-wave signal is also applied to a shift register which, after a time delay, applies the same signal to another input of the exclusive-OR gate. With these connections, the exclusive-OR gate produces a square-wave output whose duty cycle is proportional to the speed of the DC motor. This output can then be either amplified and applied directly to the electric motor to drive it, or integrated and applied to an amplifier to drive the motor in accordance with standard servo techniques.
REFERENCES:
patent: 3176208 (1965-03-01), Gifft
patent: 3351868 (1967-11-01), Farrow
patent: 3500160 (1970-03-01), Sommer
patent: 3546553 (1970-12-01), Loyd
patent: 3628114 (1971-12-01), Pattantyus
patent: 3851742 (1974-12-01), Sommer
patent: 3858100 (1974-12-01), Bussi
patent: 3936663 (1976-02-01), Taylor et al.
patent: 4117419 (1978-09-01), Rudd
patent: 4155033 (1979-05-01), DeBell et al.
Leis Michael D.
Rose Robert C.
Digital Equipment Corporation
Smith Jr. David
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