Improvement of torque undulation in BLDC using SEPIC and common end diode clamped three-level inverter

Abstract

Brushless Direct Current (BLDC) motor is a 3-phase brushless permanent sine wave motor fed from an adjustable oscillated inverter managed through a halleffect sensor. A BLDC motor is a DC motor with an armature on the stator side and a field winding on the rotor side. BLDC is an improved 3-phase brushless permanent magnet sine wave motor where Sinusoidal Counter-Electromotive Force (SCE) is replaced by Trapezoidal Counter-Electromotive Force (TCE) in BLDC motor. The turn-off region in the counter-Electromotive Force (emf) of a BLDC motor must be smaller to commutate the phase current of the motor [1]. In 120 ° mode, trapezoidal back-emf will be constant for producing smooth torque. To turn off armature current, electronic commutation is replaced in BLDC motor, which abolishes the problems associated with firing and enervating, thereby making a BLDC a robust machine [1].*Author for correspondence BLDC drive has been replaced from Induction Motor (IM) drive in servo applications [2-4] with improved power factor. To improve the speed and to provide smooth torque during transient conditions, torque and flux are controlled using conventional two-level inverter systems. The phase current of the inverter gets distorted, which produces torque distortion in a conventional method. Several converter topologies with DC-DC converters are suggested to improve the torque distortion. Conventional three-level inverters create large back emf and fast switching action during high-speed operation. The three-level inverter produces a large current ripple which leads to torque ripple and vibration. The problem associated can be reduced by replacing conventional three-level inverter with Single-Ended Primary Inductor (SEPI) converter fed BLDC motor [5,6]. The main goal of our suggested method is to minimize the torque distortion and improve the performance of the BLDC motor.

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