Commutation Torque Ripple Reduction In BLDC Motor Using Modified Sepic Converter And Three Level Sepic Converter
To design and implementa combination of a 3-level diode clamped multilevel inverter (3-level DCMLI), a modified single-ended primary-inductor converter (SEPIC), and a dc-bus voltage selector circuit are employed in the proposed torque ripple suppression circuitto suppress the torque ripple due to the phase current commutation of a brushless DC motor (BLDCM) drive system.
A commutation torque ripple reduction circuit has been proposed using 3-level DCMLI with modified SEPIC converter and a dc-bus voltage selector circuit. A laboratory-built drive system has been tested to verify the proposed converter topology. The suggested dc-bus voltagecontrol strategy is more effective in torque ripple reduction in the commutation interval. The proposed topology accomplishes the successful reduction of torque ripple in the commutation period and experimental results are presented to compare the performance of the proposed control technique with the conventional 2-level inverter, 3-level DCMLI, 2-level inverter with SEPIC converter and the switch selection circuit-fed BLDCM. In order to obtain significant torque ripple suppression, quietness and higher efficiency, 3-level DCMLI with modified SEPIC converter and the voltage selector circuit is a most suitable choice to obtain high-performance operation of BLDCM. The proposed topology may be used for the torque ripple suppression of BLDCM with the very low stator winding inductance
Reducing the torque pulsation is essential to improve the torque performance of the BLDCM drive system. Depends on the drawback there are number of ideologies has proposed such as,
- The causes of torque ripple in BLDCM during commutation interval have been investigated for both 120° and 180° electrical conduction modes of the inverter and a composite switching mode has been proposed for effective torque ripple suppression at all speeds.
- Variable input voltage method has been proposed for the effective torque ripple suppression during the freewheeling period of BLDCM. In this method, the period of the freewheeling region and optimized voltage have been estimated using the Laplace transformation.
- Novel current control scheme using deadbeat current controller has been reported for the torque ripple reduction of BLDCM using a single dc-bus current sensor
- Various hybrid converter topologies have been proposed with a dc-dc converter to improve torque performance of 2-level inverter-fed BLDCM
- A buck converter has been employed between the dc supply and conventional 2-level inverter for the speed control of BLDCM, which can significantly reduce the torque ripple at lower speeds.
- Super-lift Luo-converter has been employed in front of the 2-level inverter to lift the dc-bus voltage to the desired value for the torque ripple suppression at high-speed work conditions
- A novel circuit topology with SEPIC converter and a switch selection circuit has been proposed for torque ripple suppression of BLDCM drive with dc-bus voltage control. To reduce the commutation torque ripple,
- A novel circuit topology has been proposed for torque ripple suppression of BLDCM drive system which is built by a 3- level DCMLI with two SEPIC converters and a commutation voltage selection circuit
- A 5-level CHB inverter has been proposed for harmonics and torque ripple suppression of BLDCM drive with current and speed closed loop control. This converter needs galvanically isolated dc source for each of the H-bridge.
In this paper, a novel converter topology is proposed to reduce the torque ripple of the BLDCM drive system. The proposed converter is composed a modified SEPIC converter and a MOSFET-based 3-level DCMLI. The modified SEPIC converter operates with high static gain and less switching voltage stress than classical DC-DC converters. Hence, the modified SEPIC converter is used in this proposed torque ripple suppression circuit and the duty cycle is adjusted to obtain the desired dc-bus voltage based on the spinning speed of the BLDCM. The 3-level DCMLI is used for further reduction of the current ripple and as well as the resultant torque ripple. The MOSFET-based voltage selector circuit is used to apply regulated dc-bus voltage for efficient commutation torque ripple suppression.
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