METHOD AND DEVICE FOR DETERMINING A MOMENTARY TORQUE OF AN ELECTRONICALLY SWITCHED ELECTRIC MACHINE AND FOR REGULATING THE AVERAGE TORQUE

摘要

The invention relates to a method for determining an actual torque of a multiphase electric machine (2), said electric machine (2) being controlled by means of a driver circuit (3), whereby phase voltage or phase potential profiles are applied to phases of the electric machine (2), said method comprising the following steps: the received electric power (PEl) and the ohmic power loss of the electric machine (2) is determined; the mechanical power (PMech) provided by the electric machine (2) is determined by a power balance according to the received electric power and the ohmic losses; and the actual torque (MIst) is determined on the basis of the determined mechanical power (PMech).