Electric vehicle-used built-in permanent magnet synchronous motor flux weakening control method

A permanent magnet synchronous motor and field-weakening control technology, which is applied in motor generator control, AC motor control, electronic commutation motor control, etc., can solve the problems of poor system stability and low accuracy of speed and torque control, and achieve The effect of improving control precision

Inactive Publication Date: 2015-11-18
ZHENGZHOU AIRCRAFT EQUIP +1
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Problems solved by technology

The traditional field weakening control method is to adjust the d-axis current according to the change of the rotational speed and q-axis current on the basis of theoretical analysis. This method needs to know the d-axis and q-axis inductance of the motor, and these parameters will follow the operation of the motor Therefore, the speed and torque control accuracy of this field weakening method is not high, and the system stability is not good

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  • Electric vehicle-used built-in permanent magnet synchronous motor flux weakening control method
  • Electric vehicle-used built-in permanent magnet synchronous motor flux weakening control method
  • Electric vehicle-used built-in permanent magnet synchronous motor flux weakening control method

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Embodiment Construction

[0009] Such as figure 1 As shown, the field weakening control method of the built-in permanent magnet synchronous motor for electric vehicles of the present invention collects the two-phase current of the motor and the real-time position of the rotor, and obtains the d-axis reference voltage after Clarke transformation, Park transformation, and current loop PI regulator , according to the output of the current controller with reference voltage Compare to judge whether to enter the field weakening control.

[0010] During low speed operation, such as figure 2 As shown, the current vector trajectory along the figure 2 moving in the OA direction, the output voltage of the current regulator less than the reference voltage , the voltage outer loop PI controller does not work, and the d-axis offset current , current reference value is the output of the speed loop, and the d and q axis current reference values ​​are calculated according to the maximum torque current r...

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Abstract

The invention discloses an electric vehicle-used built-in permanent magnet synchronous motor flux weakening control method. Two phases of current and a real-time rotor position of the motor are acquired, after Clarke transformation, Park transformation, an current ring PI adjustor, d-axis reference voltage ud and q-axis reference voltage uq are obtained, and output u* as described in the description of a current controller and reference voltage umax are compared to judge whether to enter flux weakening control. The method of the invention has the beneficial effects that the control precision of torque and speed and stability of the system are improved without depending on parameters of the motor.

Description

technical field [0001] The invention relates to the technical field of electric vehicle control, in particular to a field weakening control method for a built-in permanent magnet synchronous motor for electric vehicles. Background technique [0002] Electric vehicles not only need to have high torque at low speed so that the vehicle can start quickly, but also need to have a high speed, which makes the drive motor must be weakened to obtain a wider speed range. The traditional field weakening control method is to adjust the d-axis current according to the change of the rotational speed and q-axis current on the basis of theoretical analysis. This method needs to know the d-axis and q-axis inductance of the motor, and these parameters will follow the operation of the motor Therefore, the speed and torque control accuracy of this field weakening method is not high, and the system stability is not good. Contents of the invention [0003] The object of the present invention i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P6/08H02P21/00H02P25/02
Inventor 赵阿娟李国杰郝金淼张向科
Owner ZHENGZHOU AIRCRAFT EQUIP
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