Motor overload indicating arrangement

Details Motor overload indicating arrangement Motor overload indicating arrangement

1991-08-12

1992-09-29

Ro, Bentsu

Electricity: motive power systems

Limitation of motor load, current, torque or force

318266, 318469, 318809, 361 30, H02P 736

Patent

active

051516381

ABSTRACT:
An arrangement for detecting a motor overload condition by examining the phase angle relationship between the motor voltage and current. As the load increases, the phase angle difference approaches zero. By measuring the zero crossings of the voltage and current and providing a signal representative of the time difference between these crossings, the phase angle relationship is determined and, accordingly, so is the motor load. Specifically, a saturable ferromagnetic core is utilized to detect the current zero crossings.

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patent: 4703387 (1987-10-01), Miller
patent: 4853605 (1989-08-01), Matsuo et al.
patent: 4937561 (1990-06-01), Sasaki et al.
patent: 5038091 (1991-08-01), Bashark

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