Method and device for detecting blocking rotation of direct current brush motor

Abstract

The invention discloses a method and device for detecting blocking rotation of a direct current brush motor, wherein the method comprises the following steps: in each starting stage of the direct current brush motor, the blocking rotation detection threshold value is obtained according to the current starting characteristic analysis of the direct current brush motor, and the detection is carried out according to the blocking rotation detection threshold value in the subsequent blocking rotation detection. As the current starting characteristic of the direct current brush motor is analyzed during each starting process of the direct current brush motor to obtain the blocking detection threshold value, the blocking detection threshold value can be suitable for the direct current brush motor under different temperatures and voltages, thereby improving the practicability and the reliability of the technical scheme, and reducing the calibration workload due to no need of calibrating each direct current brush motor.

Description

Technical field [0001] The present invention relates to the technical field of motors, and more specifically, to a method and device for detecting locked-rotor of a DC brushed motor. Background technique [0002] With the development of automobile technology, a large number of components controlled and driven by DC brush motors are widely used to improve the comfort of vehicle operation. Such as the electric opening and closing of moving parts such as sunroofs, doors and windows, rearview mirrors, seats, etc., driven by motors. On the one hand, during the movement of the above-mentioned moving parts, it is necessary to perform a locked-rotor judgment; on the other hand, when the above-mentioned mechanism is initialized to learn the zero position, a locked-rotor judgment is also required to avoid long-term locked-rotor causing excessive current and motor Overheating damages the motor or the corresponding control circuit. [0003] At present, there are a variety of locked-rotor det...

AI Technical Summary

Problems solved by technology

A locked-rotor detection method based on the magnitude of the current. When it is recognized that the actual current is greater than the set current threshold and lasts longer than the set time, it is judged that a locked-rotor has occurred and the motor is stopped; however, the current threshold of this scheme is preset The fixed value of the calibration needs to be calibrated for the locked-rotor current under different working conditions for each motor, which increases the workload

A stall detection method based on ripple. According to whether there is a new ripple pulse in the ripple signal within the preset time, the stall detection of the motor is carried out; Slower, increased ripple pulse width, prone to false detection, poor practicability and reliability

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