H - Electricity – 02 – H
Patent
H - Electricity
02
H
318/86
H02H 7/08 (2006.01) H02H 3/12 (2006.01)
Patent
CA 1285313
Abstract of the Disclosure "Electric Motor Load Sensing System" This disclosure relates to a load sensing system which can provide underload protection for an electric motor connected to first and second power supply lines, the lines being connectable to an AC power supply. The system comprises a line voltage sensing circuit connected to the first line and having a line voltage signal impressed therein, and an amplitude adjustment circuit connected to the voltage sensing circuit for adjusting the line voltage signal to produce an amplitude adjusted voltage signal. A line current sensing circuit is connected to the second line and has a line current signal impressed thereon, and a phase adjustment circuit is connected to the current sensing circuit for adjusting the phase of the current signal to produce a phase adjusted current signal. A phase responsive circuit is connected to the amplitude adjustment circuit and to the phase adjustment circuit for producing an adjusted power factor signal, and circuit means is connected to the phase responsive circuit for disconnecting the power lines when the power factor is displaced from a preset value. For example, the circuit means may be a disconnect means disconnecting the power lines when the power factor is below a preset value.
535448
Finlayson & Singlehurst
Franklin Electric Co. Inc.
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