METHOD TO CONTROL AN ELECTRIC MOTOR WITH ADJUSTMENT OF THE VALUE OF THE EQUIVALENT IMPEDANCE

摘要

A method to control an electric motor (27) providing the steps of: determining a target torque (Tgt_Torque); calculating a target current (Tgt_Current) by dividing the target torque (Tgt_Torque) by a torque constant (KT); determining an equivalent impedance (RLS) by means of a predetermined map (M); calculating the voltage drop (V_I) by multiplying the target current (Tgt_Current) by the equivalent impedance (RLS); calculating a counter-electromotive force (FCEM) by multiplying an actual rotation speed (Act_Speed) by a speed constant (KV); determining a control voltage (V_Control) to be applied to the power supply terminals (30) of the electric motor (27) by adding the voltage drop (V_I) to the counter-electromotive force (FCEM); determining an offset parameter (RLS_offset); and correcting the equivalent impedance (RLS) provided by the predetermined map (M) by applying the offset parameter (RLS_offset).