H - Electricity – 02 – P
Patent
H - Electricity
02
P
318/103
H02P 27/04 (2006.01)
Patent
CA 1058695
ABSTRACT OF THE DISCLOSURE A motor control circuit is provided for regulating the torque of a polyphase or single phase ac induction motor operated at a variable frequency. The control circuit is based on the principle of maintaining constant the in-phase component of stator current compensated for the voltage drop across the stator resistance, while also holding constant the slip frequency. In operation, the per phase instantaneous stator supply line current and voltage are continuously sensed and supplied to a generating device for deriving a per phase supply line voltage compensated for the stator resistance voltage drop. The compensated supply line voltage signal is used in conjunction with the instantaneous current signal to generate a desired modified in-phase stator current component signal, either in one half cycle or in both half cycles. In a polyphase circuit, the several modified in-phase stator current component signals are summed and filtered to produce an averaged do signal. This dc signal is used in a feedback control system for a power converter which supplies to the motor a voltage adjustable in frequency and in amplitude. A preferred embodiment is a drive system for a three-phase induction motor, with the power converter being a polyphase pulse-width-modulated inverter.
244000
Company General Electric
Na
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