Apparatus for measuring excitation parameters of induction motor and method thereof

A method for measuring excitation parameters of an induction motor, comprising:

• maintaining the induction motor static, and inputting a test current to a test phase of the induction motor;
• and
• calculating, performed by an excitation parameter calculating unit, based on a voltage of the test phase of the induction motor, a stator flux linkage of the test phase of the induction motor corresponding to a magnitude of the test current;
• wherein maintaining the induction motor static comprises controlling a magnitude and a direction of volts voltage or current provided to the test phase and non-test phases of the induction motor, in which:
• the test current or the voltage provided by a power converter to the test phase of the induction motor respectively equals a sum of the magnitudes of currents or the magnitudes of voltages provided to another two non-test phases of the induction motor, and the direction of the test current or the voltage is opposite to a direction of currents or voltages provided to the two non-test phases;
• or
• the test current or the voltage provided by the power converter to the test phase of the induction motor respectively equals the magnitude of current or the magnitude of voltage provided to one non-test phase of the induction motor, and the direction of the test current or the voltage is opposite to the direction of current or voltage provided to said one non-test phase, and another non-test phase of the induction motor is electrically disconnected from the power converter or none of current or voltage is provided by the power converter to said another non-test phase of the induction motor.