Slip control based on sensing voltage fed to an induction motor

Details Slip control based on sensing voltage fed to an induction motor Slip control based on sensing voltage fed to an induction motor

H - Electricity

02

P

H02P 21/08 (2006.01)

Patent

CA 2044075

An electronic motor drive for vector control of an induction motor controls slip and operating frequency in response to changes in stator voltage. The drive includes a torque control loop, a flux control loop and a frequency control loop which includes slip control in response to a voltage difference. In the constant horsepower range, above base speed, slip is controlled in response to an error between a d-axis reference voltage that is sampled at base speed and a d-axis feedback voltage that is sensed when the motor is operating above base speed. Flux-weakening is provided in response to an error between a q-axis reference voltage that is sensed when the motor is operating at base speed and a q-axis feedback voltage that is sensed when the motor is operating above speed.

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