Abstract
The vital area in brushless direct current (BLDC) motor drive used in electric vehicle drive is motoring, regenerative braking, battery charging, and speed control. To attain these, separate circuits should be used. Switching pattern for the first three modes integrated with sensorless speed control for which finds application in electric vehicle is highly warranted in the present scenario. This paper addresses in detail these four areas. The proposed switching pattern enables the same converter for motoring operation of BLDC motor to be used during regenerative braking as well as rectifier in charging mode of battery from the AC grid. Line voltage detection-based sensorless speed control method is also discussed in the paper so that reliability of the system can be improved. The effectiveness of the proposed method is verified using simulation and also virtual hall sensor signals are compared with actual hall sensor signals experimentally under variable speeds.
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