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
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[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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