engleski

A Study of Sensorless Control of Induction Motor at Zero Speed Utilizing High Frequency Voltage Injection

A detailed investigation of sensorless control of induction motor at zero and very low speed based on injection of a pulsating high frequency voltage signal is presented. A sensing technique used to measure air gap flux position in a squirrel cage induction motor is based on the secondary effect of magnetic spatial nonlinearity caused by saturation of the stator laminations. The physical insight into the motor excited by high frequency test signals is given by means of experiment and finite element simulation. It is shown that it is possible to control the motor torque using the proposed technique, but with low bandwidth and with the necessity to perform special tests and measure special characteristics for each new motor prior to utilization.

sensorless control; induction motors; measurements; modelling

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