Method for identifying stator resistance and rotor resistance online 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

Inactive Publication Date: 2016-01-27
ZHEJIANG UNIV
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  • Method for identifying stator resistance and rotor resistance online in asynchronous motor speed sensorless system
  • Method for identifying stator resistance and rotor resistance online in asynchronous motor speed sensorless system
  • Method for identifying stator resistance and rotor resistance online 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 identifying the stator resistance and the rotor resistance online in an asynchronous motor speed sensorless system. According to the method, a controller constructs an adaptive observer using direct or indirect field-oriented control. First, the given signal of the motor rotor flux amplitude is a trapezoidal wave (including DC component), and the given signal can be composed of a flat given part and a slope given part; and then, the observer self-adapts to the stator resistance and speed when the actual rotor flux amplitude keeps up with the flat given part, and the observer self-adapts to the rotor time constant and speed when the actual rotor flux amplitude tracks the slope given part. The method is of high universality. The problem that simultaneous identification of the stator resistance and the rotor resistance in a speed sensorless system is difficult is overcome. The accuracy of speed identification is improved. The control performance of rotors in a full-speed range is improved.

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...

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Application Information

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