Apparatus for testing reactance parameter of permanent magnet motor based on small DC attenuation

Abstract

The device includes DC power supply, transformer, rectification module, data acquisition card, single process and protection module, signal amplification module, computer, relay, non-inductive resistance etc.. Including two pieces of triodes, the control signal amplification module magnifies a control signal sent from the computer by the said amplifying circuit in order to realize function of attenuating DC through controlling on/off of the relay. The single process and protection module includes operational amplification circuit (OAC), control switch, regulation tube. Being obtained from input signal of passing through OAC, the amplified voltage signal subtracts difference mode signal obtained by two control switches, then is amplified in operational amplifier. Amplified attenuation signal is sent to the data acquisition card which transfers collected signal to computer for carrying out calculating parameter of reactance.

Description

technical field [0001] The invention belongs to a motor reactance parameter testing device, in particular to a device for testing the reactance parameter of a permanent magnet motor based on a small direct current attenuation method. Background technique [0002] The conventional DC attenuation method is to determine the reactance parameters of the permanent magnet motor by using the transition process in which the stable DC current in the armature winding decays to zero due to the loss of the excitation voltage; during the transition process, the saturation degree of the motor is constantly changing. In this way, the correct saturation parameter value cannot be obtained by processing the DC attenuation curve. At the same time, due to the cross-saturation phenomenon of permanent magnet motors, the conventional DC attenuation method does not take this into account, and is not well connected with the actual operating state of the motor. Moreover, the use of this method to mea...

AI Technical Summary

Problems solved by technology

[0002] The conventional DC attenuation method is to use the transition process in which the stable DC current in the armature winding decays to zero due to the loss of the excitation voltage to determine the reactance parameters of the permanent magnet motor; during the transition process, the degree of saturation of the motor is constantly changing. In this way, the correct saturation parameter value cannot be obtained by processing the DC attenuation curve

At the same time, due to the cross-saturation phenomenon of permanent magnet motors, the conventional DC attenuation method does not take this into account, and it is not well connected with the actual operating state of the motor

Moreover, the use of this method to measure the reactance parameters of permanent magnet motors is usually limited to the basis of using limited components in the laboratory, without considering repeatability and accuracy, and there are no reports on test instruments specially used in actual engineering

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