Abstract
Based on the Single-Input Dual-Output (SIDO) Cuk converter, a novel commutation torque ripple suppression strategy is proposed for a brushless DC motor (BLDCM). Two voltage scalars are constructed, according to the operating principle of SIDO Cuk converter and BLDCM, and applied to the non-commutation and commutation periods, respectively, of BLDCM; the commutation torque ripple in the full speed range is effectively reduced, and this occurs without the need to switch the control strategy according to the speed range. The inverter in the proposed strategy is controlled by the pulse amplitude modulation (PAM) during both non-commutation and commutation periods, and the voltage spike damage caused by the inverter chopping to the motor can be minimized. In addition, the multiple outputs of the SIDO Cuk converter improve the utilization of the DC power for the BLDCM control system. The experimental results verify the effectiveness of the proposed strategy.
Highlights
Due to the advantages of small size, high power density, and simple structure, etc., brushless DC motors (BLDCM) are widely used in aerospace, household appliances, electric vehicles, and other fields [1,2,3,4,5]
A hybrid switching method is proposed in [12]; the motor is controlled by two-phase and three-phase conduction modes during the non-commutation and commutation periods, and the voltage compensation method is combined during the commutation period to suppress the commutation torque ripple
The energy of the BLDCM operation during the non-commutation and commutation periods is provided by two different output voltages of the Single-Input Dual-Output (SIDO) Cuk converter in order to reduce the commutation torque ripple
Summary
Due to the advantages of small size, high power density, and simple structure, etc., brushless DC motors (BLDCM) are widely used in aerospace, household appliances, electric vehicles, and other fields [1,2,3,4,5]. When the motor is running in the high speed range, it is limited by the DC side voltage of the inverter and cannot effectively suppress the commutation torque ripple in the full speed range In this regard, a control strategy, adding a DC-DC converter at the front end of the inverter, has been proposed to provide a higher voltage to the BLDCM by adjusting the DC bus voltage during commutation, thereby solving the commutation torque in the full speed range [15]. In [17], the commutation torque ripple can be reduced by adjusting the Z-source inverter through vector and the effective vector duty cycle This strategy can use a DC power supply which is lower than the rated voltage of the motor to improve the utilization rate of the power supply voltage. For industrial applications with lower DC power supply voltage, the power supply voltage utilization rate can be improved by using the two output voltages of the SIDO Cuk converter
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