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Abstract
The properties of brushless DC motor (BLDCM) are similar to the fractional, slot-concentrated winding of permanent-magnet synchronous machines, and they fit well for electric vehicle application. However, BLDCM still suffers from the high commutation torque ripple in the case of the traditional square-wave current control (SWC) method, where the current vector rotates asynchronously with back-EMF. A current optimizing control (COC) method for BLDCM is proposed in the paper to minimize the commutation torque ripple. The trajectories of the three phase currents are planned by the given torque and the optimized result of the copper loss and motor torque equations. The properties of COC are analyzed and compared with that of SWC in the stationary reference frame. The results show that the way of making the current vector rotate synchronously with back-EMF (back-Electromotive Force) can minimize the modulus and velocity of the current vector in the commutation region, and reduce the torque ripple. Experimental tests obtained from an 82 W BLDCM are done to confirm the theoretical findings.
Highlights
brushless DC motor (BLDCM) with trapezoid wave back-EMF has been widely used in industry and civil equipment due to its advantages of high torque and power density, and low inverter capacity demand [1]
BLDCM has the disadvantage of high commutation torque ripple in the traditional square-wave current control method, which increases the operating noise and reduces the torque control precision
Current optimizing method for BLDCM, the decoupling involving d q synchronous frame this paper provides a current optimizing method in control the natural a–b–cthereference frame and its is always adopted in analyses
Summary
BLDCM with trapezoid wave back-EMF has been widely used in industry and civil equipment due to its advantages of high torque and power density, and low inverter capacity demand [1]. BLDCM has the disadvantage of high commutation torque ripple in the traditional square-wave current control method, which increases the operating noise and reduces the torque control precision. A method of Z-source inverter-fed BLDCM is proposed in [6], which can reduce the commutation torque ripple by regulating the duty cycle of the shoot-through vector and the active vector. AddingThe power supply circuits or modifying powerare topology and decrease the reliability of the trapezoidal phase back-EMFs of the BLDCM rich in will make the power current and control method complex, and decrease the reliability of the harmonics. Experimental results are carried out to verify the proposed method
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