Method and device for operating actuator with brushless electric motor

Abstract

The invention relates to an actuator system (1), in particular for operating a flap in a motor vehicle, comprising: - a drive (4) with an electronically commutated electric motor; - a movable actuating element (6); - a mechanism (5) which couples the drive to the actuating element (6), with the result that an adjustment of the actuating element is brought about upon actuation of the drive; - a position sensor (7) for detecting a position of the actuating element (6) on the actuating element (6) and for providing a corresponding position description; - a control unit (3), in order to actuate the drive for moving the actuating element (6); wherein the electric motor of the drive (4) is electronically commutated, wherein the control unit (3) is configured in order to provide actuating signals to the electric motor for moving the actuating element (6), which actuating signals are a function of the provided position description and bring about a predefined drive moment and / or a predefined rotational speed of the electric motor.

Description

technical field [0001] The invention relates to a brushless electric motor for use in an actuator, in which the position of the actuator to be adjusted can be read out by means of a position sensor. Background technique [0002] A large number of actuators are used in automobiles. Actuators generally include electromechanical drives, transmissions and actuators, the position of which can be set by the electric motor as well as via the transmission. Such actuators are used, for example, as throttle valve adjusters, exhaust gas recirculation valves, for charging sports flaps and numerous similar components. [0003] Depending on the field of use, such actuators are usually equipped with a position sensor for reading the actual actual position of the actuator. Such a position sensor can be used on the one hand to check the correct position of the actuator. It can thus be monitored that the activated position of the actuator also corresponds to the actual set position of the ...

AI Technical Summary

Problems solved by technology

Conventional methods for detecting the rotor position use an additional rotor position sensor in the electric motor, which makes the actuator more expensive overall and also increases the outlay for cabling between the actuator and the corresponding controller

Sensorless methods, for example based on the measurement of the voltage induced in the stator winding, require complex wiring in the controller and are generally too complex for use in actuators

[0006] The alternative method of determining the rotor position by means of the rotor-position-dependent induction of the stator coils likewise requires complex wiring in the controller and is also not as robust and reliable as the method for measuring the rotor position with connected sensors

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