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MODELING AND CLOSED LOOP CONTROL OF BLDC MOTOR USING A SINGLE CURRENT SENSOR

Tony Mathew, Caroline Ann Sam

For closed loop current control of BLDC motor, the motor phase currents are measured using current sensors. These sensors are bulky, heavy and expensive. Also the use of different current sensors can cause undesirable imbalance in phase currents as well as torque fluctuations due to differences in current sensor sensitivities. These drawbacks can be avoided by using a single current sensor placed on the DC link. Here an algorithm is presented to obtain the phase current values from the DC link current. The proposed and conventional systems were simulated using MATLAB/Simulink, to compare their performance.