Low Power Sensorless PMBLDC Motor Drive with PFC for Domestic Flour Mill

A low power brushless DC (BLDC) motor drive for domestic flour mill is manifested here. A soft starting based motion sensorless speed control algorithm for BLDC motor fed flour mill is implemented here as the large speed variation is the key challenge for a flour mill application. The implemented sensorless control is tolerant enough to control the current variation in position sensorless mode due to intermittent load variation of the flour mill. The sensorless control used here is insensitive to the switching noise and separate filtration for this not needed. Good rotor position estimation is achieved in wide speed range using the implemented sensorless control. A single DC link current sensor is used for the current control in sensorless starting and load variation. A boost converter based power factor correction is implemented her for maintaining the grid side power quality. The developed sensolress control algorithm is the motor model independent and no parameter estimation is required. The stability and reliability of this system is validated using both simulation and experimental test results.