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Method of Online Identification of Stator and Rotor Resistance in Asynchronous Motor Speed ​​Sensorless System

A speed sensorless, asynchronous motor technology, applied in the field of motor parameter identification, can solve problems such as complex stator resistance, and achieve the effect of identification

Inactive Publication Date: 2018-01-12
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Such articles provide detailed proofs and corresponding experimental results, but their schemes are complex and the identified stator resistance is only a first-order approximation

Method used

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  • Method of Online Identification of Stator and Rotor Resistance in Asynchronous Motor Speed ​​Sensorless System
  • Method of Online Identification of Stator and Rotor Resistance in Asynchronous Motor Speed ​​Sensorless System
  • Method of Online Identification of Stator and Rotor Resistance in Asynchronous Motor Speed ​​Sensorless System

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Embodiment Construction

[0053] The present invention will be further elaborated below in conjunction with the accompanying drawings and embodiments.

[0054] 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.

[0055]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, rotor flux linkage voltage model and current model observer module, rotor magnetic Chain amplitude field weakening judgment and trapezoidal wave given module, parameter adaptive law module, 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 mod...

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Abstract

The invention discloses a method for online identification of stator and rotor resistance in an asynchronous motor speed sensorless system. The realization steps are as follows: the controller adopts direct or indirect field-oriented control, and constructs an adaptive observer. First, the motor rotor flux amplitude is given as a trapezoidal wave (including DC components), and the given signal can be considered to be composed of a flat given part and a ramp given part; secondly, when the actual rotor flux amplitude keeps up with the flat After a given portion, the observer adapts to the stator resistance and speed, and when the actual rotor flux amplitude tracks the given portion of the slope, the observer adapts to the rotor time constant and speed. The method has strong versatility and overcomes the difficulty of simultaneously identifying stator and rotor resistances in a speed sensorless system, thereby improving the accuracy of speed identification and improving the control performance of the motor in the full speed range.

Description

technical field [0001] The invention discloses a multi-parameter identification method of an asynchronous motor, in particular to a method for injecting a trapezoidal wave into a given rotor flux linkage amplitude during rotor field orientation control, and belongs to the field of motor parameter identification. Background technique [0002] Vector control, or rotor field-oriented control, is one of the main control schemes in current high-performance motor control applications. At the same time, in order to improve system reliability, simplify system design, and reduce system cost, it is often necessary to introduce no-speed sensor technology. [0003] However, the accuracy of speed identification is also affected by the accuracy of stator resistance and rotor resistance. In addition, accurate rotor time constant is a key parameter for accurate field orientation in indirect field oriented control (or slip frequency control). [0004] There are few researches on cage-type a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/08H02P21/14
Inventor 黄进陈嘉豪王彤叶明赵力航
Owner ZHEJIANG UNIV