Single ended primary inductance converter based control of BLDC motor drive

Abstract

This paper presents a brushless DC (BLDC) motor drive with single-ended primary inductance converter (SEPIC) for different applications with speed control requirement. Conventionally, the PWM control based switching of inverter feeding the motor were used. This conventional scheme incorporates the continuous switching losses in inverter and also low power factor at source side. Here, in this paper DC link voltage controlling strategy is used to control the speed if BLDC motor. The VSI which feeds the BLDC motor is supplied with controlled DC link voltage at its input and electronic commutation pulses at its gate terminals. Electronic commutation gives the constant unidirectional rotor torque and losses free switching of inverter. Also, the sensor requirements for this scheme are reduced and needs just only a voltage sensor. This scheme can also be applied to the BLDC motor based electric vehicle which are powered by renewable energy sources. The proposed control scheme of BLDC motor is implemented with designed converter in software platform. This work shows the efficient work of the proposed drive as compared with conventional schemes at different aspects.