A Five Level Cascaded Multilevel Inverter Fed Brushless Dc Motor with Phase Shifted Carrier Pwm Techniques

In high power high voltage application BLDC motor are widely used because of high efficiency, simple construction, low cost less maintenance and high torque or high output power per unit volume. For driving the BLDC motor we required inverter. PWM inverter which gives good performance. In two level inverter there is a problem of harmonics distortion, lower electromagnetic interference, high DC link voltage, high dV/dt , heating of rotor shaft, voltage spikes across the motor terminals etc. The increase in the number of steps of voltage is the solution of the above problem. This can be possible using multilevel inverter. In this paper five level cascade H bridge inverter fed BLDC motor drive is proposed. The design of the inverter topology and phase shift pulse width modulating technique are presented in this paper. Simulation is carried out using matlab / simulink, validating the steady state and dynamic performance of the drive.