Motor parameter detection method and motor parameter detection device

Abstract

The invention discloses a motor parameter detection method and a motor parameter detection device. The motor parameter detection method comprises the following steps: opening the circuit of one of phase windings of a motor; detecting stator leakage inductance and rotor leakage inductance; applying rated voltage with higher frequency than rated power between the other two phases of the motor; and detecting the stator leakage inductance and the rotor leakage inductance according to the computational formula of the stator leakage inductance and the rotor leakage inductance. The invention provides the off-line motor parameter detection method and the motor parameter detection device under the static condition of the rotor of an induction motor, which achieve high accuracy of motor parameter detection through reducing the influences of voltage errors and a skin effect as long as current or voltage with different frequencies is applied between the two phases of the motor in sequence.

Description

technical field [0001] The invention relates to a motor parameter detection method and a motor parameter detection device. Background technique [0002] The induction motor has the advantages of simple structure, no winding on the rotor, convenient manufacture, cheap price, simple maintenance, long service life, etc., so it is widely used. With the development of power electronics technology and modern control theory, high-performance induction motor speed control system came into being. Generally, the high-performance induction motor speed control system often uses the vector control algorithm of the inverter or the speed sensorless algorithm, and the performance of these motor control algorithms depends on the accuracy of the motor parameters used. If the motor parameters are not accurate, It will directly lead to the decline of the control performance index or even the failure of the inverter. Therefore, how to accurately obtain the parameters of the induction motor bec...

AI Technical Summary

Problems solved by technology

However, in practical applications, due to the nonlinearity of switching devices, it is difficult to accurately compensate for voltage errors

Another way to reduce the influence of the voltage error is to increase the voltage, but increasing the voltage requires increasing the current frequency at the same time, so that when the rotor impedance is detected, errors will occur due to the skin effect

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