Method for realizing resistance measurement of asynchronous motor fixed rotor

Abstract

The invention discloses a method for realizing the resistance measurement of an asynchronous motor fixed rotor. The method is used for quickly measuring the resistance of the motor fixed rotor when the motor is static. The method comprises the following steps of: applying two currents with different sizes between any two phases of an asynchronous motor, and collecting the theoretical output voltage of an inverter to obtain equivalent stator resistance; obtaining the inverter error voltage under different current values of the inverter according to the equivalent stator resistance; applying sine-excited theoretical voltage onto any one phase of the asynchronous motor, and collecting the motor current of the phase from the zero crossing point of the sine-excited theoretical voltage to obtain a motor current sampling value of the phase within one period; obtaining the motor practical voltage sampling value of the phase within one period according to the inverter error voltage and the sine-excited theoretical voltage; carrying out discrete fourier transformation on the motor current sampling value and the motor practical voltage sampling value to obtain fundamental wave component; and obtaining the rotor resistance of the asynchronous motor according to the current of the motor and the fundamental wave component of the motor practical voltage.

Description

technical field [0001] The invention relates to the technical field of asynchronous motors, in particular to a method for realizing the measurement of the stator and rotor resistance of an asynchronous motor. Background technique [0002] The AC speed control system refers to a new type of transmission system that takes the AC motor as the control object and adjusts the output torque and speed of the motor. Compared with the DC speed control system, the AC speed control system has the advantages of good traction performance, high power factor, small size, light weight and reliable operation. The AC speed control system is gradually replacing the DC speed control system and is widely used in various fields of industrial production, national life and national defense. [0003] At present, the AC speed control system widely used in the industrial field is the driving form of voltage inverter + asynchronous motor. The AC speed control system of asynchronous motor has been widel...

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Problems solved by technology

[0005] In view of this, the main purpose of the present invention is to provide a method for realizing the measurement of the stator and rotor resistance of an asynchronous motor, so as to solve the problem of the inability to accurately measure the stator and rotor resistance of an asynchronous motor in the static state of the asynchronous motor in the prior art.

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