H - Electricity – 02 – J
Patent
H - Electricity
02
J
318/88
H02J 9/06 (2006.01) H02P 7/62 (1985.01)
Patent
CA 1235734
ABSTRACT OF THE DISCLOSURE A variable frequency power unit controlling system for controlling a variable frequency power unit to supply an electric current of a frequency corresponding to a desired revolving rate of an electric motor. A control signal designating the revolving rate of the electric motor is integrated by an integrating circuit and the output frequency of the variable frequency power unit is held at a predetermined value regardless of the control signal, when the change rate of the output signal of the integrating circuit deviates from a predetermined range of change rate.
474032
Kirby Eades Gale Baker
Mitsubishi Denki Kabushiki Kaisha
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