METHOD AND APPARATUS FOR STABILITY CONTROL OF OPEN LOOP MOTOR DRIVE OPERATION

摘要

Motor drives and control methods are presented for sensorless motor speed control in which inverter output currents are sampled from the inverter output and a frequency modulation value is determined based on the current feedback. A speed or frequency setpoint is adjusted at least partially according to the frequency modulation value to provide an adjusted frequency or speed setpoint value that is then used in controlling the inverter to provide stability control to mitigate hunting or motor stoppage.

主权项

1. A method for sensorless motor speed control in a motor drive, the method comprising:
sampling at least one AC output current feedback signal or value from an output of an inverter of the motor drive; computing a frequency modulation value based on the at least one AC output current feedback signal or value; adjusting a frequency or speed setpoint value based at least partially on the frequency modulation value to provide an adjusted frequency or speed setpoint value; and controlling the inverter according to the adjusted frequency or speed setpoint value.