Minimization of Harmonics, Vibrations and Acoustic Pressure in BLDC Motor Drive Using Variable Inductor Filter

Authors

  • Parag S. Chaudhari
  • Sanjaykumar L. Patil

Abstract

Harmonics with corresponding vibrations and its alleviation is very essential for high rating and high-performance Brushless DC (BLDC) motor drives. BLDC motor drives have substantiated an increasing demand for various automobile as well as industrial applications in recent times. Due to wide frequency range, these drives are most suited for variable speed drive applications. For longevity of motor drive system and to improve overall drive performance, harmonics and accompanying vibrations mitigation plays a vital role. High frequency current ripples can result in significant damage to the motor winding insulation and bearings. This paper proposes a servo controlled innovative inductor filter scheme which reduces current harmonics, which helps to reduce resulting torque ripples over complete speed range (and hence over wide frequency range) of BLDC Motor. Reduction in torque ripples result in minimization of motor structural vibrations and acoustic pressure. The strategy is implemented on a three phase 2 kW, 48 V, inverter fed BLDC motor drive using TI’s DSP TMS320F2812 controller followed by simulation using MATLAB / Simulink. For accurate instant position of variable inductor, a position control for DC servomotor with curve fitting technique is used. Experimental results confirm the potency of the proposed strategy. The current harmonics and corresponding motor vibrations are compared for performance of BLDC motor drive with and without the variable inductor filter.

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Published

2020-02-09

Issue

Section

Articles