Torque pulsation inhibition method for permanent magnet synchronous motor

A permanent magnet synchronous motor, torque ripple technology, applied in motor generator control, electronic commutation motor control, control generator and other directions, can solve the inaccurate detection of current zero-crossing point, increase system robustness, and poor suppression effect and other problems, so as to avoid the detection of current zero-crossing point, improve the suppression effect, and suppress the torque ripple.

Inactive Publication Date: 2015-04-29
CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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Problems solved by technology

[0005] However, in the existing schemes, the control strategy generally adopts the traditional PI adjustment for harmonic current suppression, which makes the structure complex, parameter adjustment becomes very difficult, increases the robustness of the system, and there is also inaccurate current zero-crossing detection, resulting in false positives. Compensation defects, less effective suppression

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  • Torque pulsation inhibition method for permanent magnet synchronous motor
  • Torque pulsation inhibition method for permanent magnet synchronous motor
  • Torque pulsation inhibition method for permanent magnet synchronous motor

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Embodiment Construction

[0036] The core of the present invention is to provide a permanent magnet synchronous motor torque ripple suppression method to effectively eliminate the harmonic current generated by factors such as the distortion of the air gap magnetic field and the nonlinear characteristics of the inverter, and suppress the torque ripple. And it avoids the need to accurately detect the current zero-crossing point in the traditional suppression of torque ripple, and improves the suppression effect.

[0037] In order to enable those skilled in the art to better understand the solutions of the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embo...

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Abstract

The invention discloses a torque pulsation inhibition method for a permanent magnet synchronous motor. The method comprises the following steps: acquiring three-phase currents ia, ib and ic of the permanent magnet synchronous motor; acquiring the d-axis component id5th and the q-axis component iq5th of the fifth harmonic current in the corresponding synchronous rotation coordinate system by use of ia, ib and ic and acquiring the d-axis component id7th and the q-axis component iq7th of the seventh harmonic current in the corresponding synchronous rotation coordinate system by use of ia, ib and ic; acquiring the d-axis compensation quantity udth and the q-axis compensation quantity uqth of the harmonic voltage from id5th, iq5th, id7th and iq7th; feeding the udth back to the d-axis voltage ud of a control system of the permanent magnet synchronous motor and feeding the uqth back to the q-axis voltage uq of the control system of the permanent magnet synchronous motor, eliminating the fifth harmonic current and the seventh harmonic current, and inhibiting the sixth torque pulsation and the twelfth torque pulsation. The method can effectively eliminate the harmonic current and can improve the effect of inhibiting the torque pulsation.

Description

technical field [0001] The invention relates to the technical field of motors, in particular to a method for suppressing torque ripple of a permanent magnet synchronous motor. Background technique [0002] The permanent magnet synchronous motor has the advantages of simple structure, small size, high efficiency, reliable operation, wide speed range, good dynamic and static characteristics, etc., and is widely used in AC transmission systems. When the permanent magnet synchronous motor is working, whether the electromagnetic torque is stable is the key factor to measure the performance of the motor. The torque ripple will cause vibration and noise, increase the mechanical wear of the motor, and limit its application in high-precision occasions. The pulsation of the torque will cause the pulsation of the speed, which will reduce the precision of the motor speed control. [0003] The existence of harmonics in the air-gap flux is one of the main reasons for the torque ripple of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/05
Inventor 冯江华许峻峰石敏何亚屏肖磊张朝阳文宇良郑汉锋
Owner CSR ZHUZHOU ELECTRIC LOCOMOTIVE RES INST
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