Comparison of Converter Fed Pmbldc Drive Systems with and Without Snubber

Permanent Magnet Brushless DC Motor has become a popular electrical drive because of its advantages such as high efficiency, increased reliability, quick dynamic response and very low maintenance. Due to this competitive edge it has stirred a lot of interest in simulating a PMBLDC Motor and its associated drive system in a comparatively simple manner. This paper elaborates the proposal of developing an inverter fed drive system with and without snubber in the circuit. This said snubber contains a resistor and a capacitor, where in the resistor is parallel connected with a diode. The voltage increases exponentially however the capacitance cannot change instantly therefore the critical rate of the rise in voltage slows down. Since the capacitor stores the required energy the same output is obtained even for reduced input ultimately increasing the motor efficiency. The snubber circuit can be credited with the advantages of reduced switching losses; it has a better impact on control of dv/dt and di/dt, reduction in the heating of the device, ripples and voltage transients. with the aid of MATLAB/SIMULINK software package the simulation of the PMBLDC motor drive system with and without snubber can be developed. The paper exploring the operating principle of the snubber circuit and also analyses its simulation results to verify and substantiate the theoretical analysis.