Method for monitoring the run-up to speed of asynchronous motors

Details Method for monitoring the run-up to speed of asynchronous motors Method for monitoring the run-up to speed of asynchronous motors

1978-02-10

1980-03-18

Smith, Jr., David

Electricity: motive power systems

Induction motor systems

Primary circuit control

318431, 318438, 318778, 361 79, 361 85, H02P 104

Patent

active

041941454

ABSTRACT:
A method of, and apparatus for, monitoring the run-up to speed of asynchronous motors which are turned-off within a permissible blocking or cutoff time of the motor when the speed run-up is improper, wherein after turning-on the motor there is determined a first value of an electrical magnitude which is dependent upon the phase angle between the motor current and the motor voltage after expiration of a first time-delay following turning-on of the motor, and there is then determined a second value of said electrical magnitude after expiration of a second time-delay following the turning-on of the motor. Both the first and second values are compared with one another, and the motor is turned-off when, following such comparison, there is present a magnitude indicative of improper run-up to speed of the motor.

REFERENCES:
patent: 2992365 (1961-07-01), Brill

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