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Device and method for identifying stator resistance of motor

A technology of induction motor and stator resistance, which is used in the control of electromechanical transmission, generator control, motor generator control, etc. It can solve the problems of induction motor model error, reduce vector control performance, etc., and achieve the effect of satisfying high-precision control.

Active Publication Date: 2017-05-24
WISDRI WUHAN AUTOMATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual operation, the stator resistance will change due to motor temperature rise and motor operating frequency, which will bring a very large error to the induction motor model and seriously reduce the performance of vector control

Method used

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  • Device and method for identifying stator resistance of motor
  • Device and method for identifying stator resistance of motor
  • Device and method for identifying stator resistance of motor

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Embodiment Construction

[0029] The present invention will be further described below with reference to the drawings and embodiments.

[0030] figure 1 A schematic diagram of a device for identifying the stator resistance of an induction motor. The circular structure is the signal acquisition module, which collects and saves the real-time voltage signal and current signal on the induction motor stator; the virtual short line is divided into a full-order flux observer, and the voltage signal on the induction motor stator is collected by the signal acquisition module And the actual value of the current signal to obtain the estimated value of the stator current of the induction motor and the estimated value of the rotor flux; the dotted line structure is the identification module, according to the estimated value of the induction motor stator current output by the full-order flux observer, the rotor flux The estimated value of the flux linkage and the actual value of the stator current of the induction moto...

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Abstract

The invention discloses a device used for identifying stator resistance of an induction motor and a device for implementing the method. For an induction motor in operation, estimated values of stator current and rotor flux of the induction motor are calculated by adopting a full-order flux observer of the induction motor according to stator voltage and stator current of the induction motor; and the rotor speed and the stator resistance of the induction motor are accurately calculated according to a stator current actual value, the stator current estimated value and the rotor flux estimated value of the induction motor.

Description

Technical field [0001] The invention belongs to the technical field of motor control, and specifically relates to a device and method for identifying the stator resistance of an induction motor. Background technique [0002] The vector control technology of induction motor is widely used in the industrial field because of its good control performance and easy implementation. [0003] The speed sensorless vector control technology can accurately obtain the rotor speed of the motor without installing an additional speed sensor on the induction motor, avoiding the high cost and high risk of failure caused by the installation of the speed sensor, and has been developed rapidly. For the speed sensorless vector control technology, the induction motor parameters required to establish the induction motor model have a decisive influence on the performance indicators of the vector control. These parameters include stator resistance, rotor resistance, stator leakage inductance, rotor leakage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
CPCH02P21/14
Inventor 李佳庆卢家斌康现伟康惠林
Owner WISDRI WUHAN AUTOMATION
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