Acoustic Noise Reduction of Switched Reluctance Motor Drives

This paper presents a simple and novel procedure for acoustic noise reduction in Switched Reluctance Motors (SRMs) drive. The main sources of acoustic noise in a SRM are the radial magnetic force and torque ripple. To investigate the radial force, an analytical relationship between motor designs and drive parameters is required. Thus, in this method two mathematical methods for calculation of radial force and torque have been proposed. These nonlinear relations show that phase current is one of the important factors in the SRM drive parameters because radial force and torque is dependent on the square of current, directly. The aim of this paper is the reduction of torque ripple and radial force by optimizing current wave form via fuzzy logic control. The FL injects an additional current for each phase current in regions which torque reduces and radial force is not maximized. The presented drive has been simulated by MATLAB/SIMULINK for nonlinear model of the SRM. The simulation results show that the proposed drive will decrease maximum radial force and torque ripple but will keep the previous maximum torque. This drive has the advantages such as: simple implementation on the every SRM drive without extra hardware, low cost, high reliability and excellent performance at long term due to more less vibration.