The maximum torque control method for asynchronous motor in field-weakening operation
A technology for asynchronous motors and maximum torque, which is applied in the fields of electric vehicles, power electronics and motor drives, and can solve problems such as the inability of asynchronous motors to output maximum torque
Active Publication Date: 2016-02-03
XJ ELECTRIC +1
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[0004] The purpose of the present invention is to provide a maximum torque control method for the field-weakening operation of an asynchronous motor to solve the problem that the existing control technology cannot realize the maximum torque output of the asynchronous motor in the field-weakening area
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[0013] The asynchronous motor adopts stator field-oriented vector control, and the field-weakening area is further divided into two areas according to the voltage limit, current limit and torque limit of the asynchronous motor's field-weakening area operation, namely the constant power area and the reduced power area. In the constant power region, the output torque of the motor is limited by the voltage limit and current limit. According to the relationship between the voltage limit, current limit and the motor flux, torque current, the optimal magnetic flux when the motor is running in the constant power region can be obtained. In the power reduction area, the output torque of the motor is limited by the voltage limit and torque limit. According to the relationship between the voltage limit, torque limit and the motor magnetic flux and torque current, it can be solved that the motor is running in the power reduction area. The optimal flux command at .
[0014] 1) Voltage limi...
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The invention relates to a control method for maximum flux-weakening operation torque of an asynchronous motor. Stator field-oriented vector control over the asynchronous motor is adopted, and a flux-weakening area is divided into a constant power area and a power reduction area according to the voltage limit, the current limit and the torque limit; optimal flux instructions are obtained in the constant power area according to limitation of the voltage limit and limitation of the current limit, optimal flux instructions are obtained in the power reduction area according to the limitation of the voltage limit and the limitation of the torque limit, and the maximum torque control over the asynchronous motor in the overall flux-weakening area can be achieved; the control method is based on the stator field-oriented vector control theory which is different from the existing rotor flux linkage oriented vector control theory in essence, and compared with a direct torque control method, the control method for the maximum flux-weakening torque of the asynchronous motor is superior to the direct torque control method in the aspects of torque pulsation, homeostatic control accuracy and the like.
Description
technical field [0001] The invention belongs to the technical fields of electric vehicles, power electronics and motor transmission, and relates to a method for controlling the maximum torque of an asynchronous motor with weak magnetic operation. Background technique [0002] Due to its simple structure, low price, reliable operation, convenient maintenance, large capacity and other advantages, asynchronous motors have been more and more used in speed control systems. When the asynchronous motor works in the field weakening area, it is often required to be able to output the maximum torque. Under the limitation of the maximum voltage that the inverter can provide, the rated current of the motor and the mechanical characteristics, the size of the magnetic flux seriously affects the ability of the motor to output torque. If the magnetic flux is too small, the torque output by the motor will be due to the stator current If the magnetic flux is too large, the counter electromot...
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Inventor 姚为正冯宇鹏张海龙刘刚肖鹏张扬芦开平
Owner XJ ELECTRIC