Electronic motor protection for variable speed motors

Details Electronic motor protection for variable speed motors Electronic motor protection for variable speed motors

1981-11-04

1983-11-01

Weldon, Ulysses

Electricity: motive power systems

Braking

Automatic and/or with time-delay means

318310, 318317, 318449, 318455, 361 30, G05B 500, H02H 504

Patent

active

044132131

ABSTRACT:
A motor protection circuit which generates a signal having a value proportional to the magnitude of the input current of the motor and a motor speed signal having a value proportional to the difference between the rated motor speed and the actual motor speed. The motor speed signal is multiplied by the input motor current proportional signal to derive a product signal. The product signal is summed with the input motor current proportional signal to derive a sum signal. The sum signal is compared with respect to a preset level to determine if it is greater than a preset level. If it is greater than a preset level, the sum signal is coupled to the input of a voltage controlled oscillator which generates an output signal having a value proportional to the magnitude of the sum signal. The output of the voltage controlled oscillator is counted in an up/down counter and an output is gated when the total count reaches a predetermined level.

REFERENCES:
patent: 3808503 (1974-04-01), Hentschel
patent: 3912976 (1975-10-01), Sons et al.
patent: 3931559 (1976-01-01), McKee
patent: 4151450 (1979-04-01), Fukuma et al.
patent: 4182979 (1980-01-01), Douglas et al.
patent: 4251846 (1981-02-01), Pearson et al.

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