METHOD AND DEVICE FOR CONTROLLING AN OPERATION OF AN ELECTRIC MOTOR

摘要

The invention relates to a method for controlling an operation of an electric motor (1). Electric voltages applied to electric phases of the electric motor (1) are generated and output in a modulation in a controlled manner dependent on a rotor position of the electric motor (1) and a target/actual comparison of at least one first variable which characterizes a load on the electric motor (1) or an actual rotational speed of the electric motor (nist). According to the invention, a rotor position angle (φ), which characterizes the rotor position, is complemented with a specified preliminary control angle (ΦΡΑ) and another regulated preliminary control angle component (φΡΑ_reg) upon reaching a field weakening range of the electric motor (1) so as to form a sum angle (φΣ), and the sum angle (φΣ) is used to characterize the rotor position in the modulation upon reaching the field weakening range. The invention also relates to a device for controlling an operation of an electric motor (1).