Dead-Time Compensation Strategy of Space Vector PWM Inverter for Hybrid Stepper Motor
Aiming at the problem of poor performance of traditional open-loop control of stepper motors,the vector control algo-rithm is combined to control the two-phase hybrid stepper motor,and the sinusoidal current is generated by the inverter to drive the motor.Due to the air gap magnetic field distortion of the stepper motor and the dead-time effect of the PWM inverter,the operating current of the stepper motor is doped with a large number of harmonics,which is especially serious when the motor is working at a low speed.In order to improve the performance of the motor at low speeds and suppress harmonic interference,combined with the op-timization of the current loop of the vector control of the hybrid stepping motor,the harmonics are extracted and suppressed through the adaptive linear neural network(ADALINE)algorithm,and then the current direction is judged to compensate the output of the inverter.The experimental results show that the proposed compensation strategy can effectively suppress the current harmonics of the two-phase PWM inverter,improve the waveform and reduce the torque ripple when the motor is running at low speed.
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