Motor parameter detection method and motor parameter detection apparatus

Abstract

The invention discloses a motor parameter detection method and a motor parameter detection apparatus. The motor parameter detection method comprises the following steps that: open circuit is carried out on a phase winding of the motor; a motor stator resistance detection step is realized; that is, a pulse direct current voltage is applied between other two phases of the motor and the motor stator resistance is detected; and a motor rotor time constant detection step is realized; that is, a stepped direct current voltage is applied between the other two phases of the motor; different time and current values of the time are measured as well as a current-time linear equation is obtained; a current value at zero time and the motor stator resistance are introduced into the current-time linear equation to obtain an approximate value of the rotor time constant. According to the invention, a motor parameter detection method and a motor parameter detection apparatus are provided on the condition that an induction machine rotor is in a static state; and high accuracy of motor parameter detection can be realized only by successively applying currents or voltages at different frequencies between two phases of the motor as well as reducing voltage errors and an influence of a sink effect.

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...

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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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