Method for verifying induction motor rotor time constant based on magnetic field orientation accuracy

A technology of rotor time constant and induction motor, which is applied in the verification of rotor time constant accuracy and the verification of the accuracy of induction motor parameter values, and can solve the problems of limited evaluation of rotor time constant identification accuracy.

Inactive Publication Date: 2017-04-26
ZHEJIANG UNIV
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  • Description
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  • Application Information

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This method requires visual inspection, and different people may have different judgments,

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  • Method for verifying induction motor rotor time constant based on magnetic field orientation accuracy
  • Method for verifying induction motor rotor time constant based on magnetic field orientation accuracy
  • Method for verifying induction motor rotor time constant based on magnetic field orientation accuracy

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Embodiment Construction

[0040] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0041] see figure 1 , the strong current part, the three-phase AC power supply is uncontrolled rectified to obtain the DC bus voltage U dc , to supply the voltage source inverter, and then obtain the three-phase power supply for the asynchronous motor.

[0042] The weak current part adopts vector control mode, including voltage and current sensors, 3-phase / 2-phase static coordinate transformation module, 2-phase static / 2-phase synchronous speed coordinate transformation module, calculation of slip, magnetic field angle, etc., rated excitation current given, Speed ​​loop PI controller module, current loop PI controller module, 2-phase synchronous speed / 2-phase static coordinate transformation module, voltage space vector pulse width modulation module.

[0043] The present invention mainly relates to the method for verifying the accuracy of the rotor t...

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Abstract

The invention discloses a method for verifying an induction motor rotor time constant based on magnetic field orientation accuracy. The implementation steps are as follows: firstly, in an indirect rotor magnetic field orientation controller a given torque current and exciting current are ensured to be equal; secondly, a motor drags a direct current generator load to rotate in an operation mode with given torque; then, a rotor time constant value in the controller is constantly changed, and corresponding motor steady state rotation speed values are recorded; and finally, when the steady state rotation speed of the motor corresponding to a certain rotor time constant value reaches the highest is observed, and the rotor time constant value is an accurate value. The method can automatically run and complete verification, and does not need people to judge an experiment phenomenon, and a result is fairly accurate.

Description

technical field [0001] The invention discloses a method for verifying the accuracy of parameter values ​​of an induction motor, in particular to a method for verifying the accuracy of a rotor time constant of a squirrel-cage induction motor based on the accuracy of magnetic field orientation, and belongs to the field of motor parameter self-tuning. [0002] technical background [0003] In the experimental stage, a specific parameter accuracy verification method should be designed to test the parameters identified by different methods, so as to judge the validity and accuracy of the method. The most common and intuitive method is time-domain model verification, which compares the measured current and simulated current (or measured torque and simulated torque) under the same input excitation to verify the accuracy of the identified equivalent circuit parameters. In addition, by comparing the measured steady-state characteristic curve with the estimated characteristic curve, th...

Claims

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Application Information

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IPC IPC(8): H02P21/16
Inventor 黄进陈嘉豪叶明
Owner ZHEJIANG UNIV
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