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

Abstract: A method controls the operation of an electric motor. Wherein electrical voltages applied to electrical phases of the electric motor are produced and output in a controlled manner in a modulation on the basis of a rotor position of the electric motor, on the basis of a set point/actual comparison, which is performed in a control loop with a speed controller, for a speed of the electric motor and on the basis of a set point/actual comparison. A set point value at the input of the current regulator is formed by multiplying a present duty factor for the modulation by a first manipulated variable applied to the output of the speed controller. The first manipulated variable of the speed controller becomes an equivalent phase current root mean square value for the electric motor in the underlying current regulator by the multiplication by the present duty factor.

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

Abstract: A method controls the operation of an electric motor. Wherein electrical voltages applied to electrical phases of the electric motor are produced and output in a controlled manner in a modulation on the basis of a rotor position of the electric motor, on the basis of a set point/actual comparison, which is performed in a control loop with a speed controller, for a speed of the electric motor and on the basis of a set point/actual comparison. A set point value at the input of the current regulator is formed by multiplying a present duty factor for the modulation by a first manipulated variable applied to the output of the speed controller. The first manipulated variable of the speed controller becomes an equivalent phase current root mean square value for the electric motor in the underlying current regulator by the multiplication by the present duty factor.