Investigating the Effect of Switching Frequency on Core-Less PMDC Motor and Estimating the optimal Range of Switching Frequency Using ni-Veristand and Labview

Abstract

This research article's primary goals are to investigate the effect of a wide range of pulse width modulation control on a core-less permanent magnet direct current motor and determining the optimal degree of PWM switching frequency. The high-frequency PWM control creates the impression that the current flow is continuous. On the other side, this causes a higher switching loss, reduced voltage across the motor terminal, and low-speed regulation. The requirement of continuous current conduction and low torque / current ripples on the pmdc motor necessitates the experimental estimation of the optimal range of switching frequency. For that, asimulation model of PMDC motor with MOSFET based H-bridge developed on the Matlab-Simulink environment. The Simulink model is then converted into a".so" file and embed into the MyRIO for HIL implementation. Interchanging the physical system by an embedded system with a model file embed into it introducesthe province shift from the simulation environment to the HIL environment. This research investigates the performance of core-less PMDC micro motor with variable PWM switching frequency in a HIL environment. These HIL simulation results confirm that the optimal range of PWM switching frequency greatly affects the performance of the pmdc motor.

Keywords-Frequency Control, Losses, DC Motor, Drives, Mathematical Modelling, Hardware-In-Loop.