SENSORLESS MOTOR DRIVE VECTOR CONTROL WITH FEEDBACK COMPENSATION FOR FILTER CAPACITOR CURRENT

摘要

Disclosed examples include methods, computer readable mediums and motor drives power conversion systems for sensorless speed control of a motor driven by an inverter through an intervening filter, in which a controller (100) computes (503) motor current feedback values ( i a.m , i b.m , i c.m ) for a current control cycle according to inverter output current values ( i u , i v . i w ), capacitance values representing capacitances of filter capacitors ( c f ) of the filter (30), filter output voltage values ( V ab , V bc , V ca ) representing output voltages of the filter (3D), and a speed feedback value (Spfbk) of a previous control cycle. The controller (100) computes (508) a speed feedback or reference value (Spfbk) for the current control cycle according to the motor current feedback values ( i a.m , i b.m , i c.m ) and the filter output voltage values ( V ab , V bc , V ca ), and controls (518) the inverter (46) to regulate the rotational speed of the motor (20) at least partially according to the speed feedback or reference value (spfbk) using vector control.