Method of operating a brushed commutator motor of an adjusting drive, and adjusting drive

Patent metadata

Field	Value
Publication number	US-10020762-B2
Application number	US-201615370780-A
Country	US
Kind code	B2
Filing date	Dec 6, 2016
Priority date	Jun 6, 2014
Publication date	Jul 10, 2018
Grant date	Jul 10, 2018

Abstract

A method operates a brushed commutator motor of an adjusting drive in a motor vehicle, particularly a window lifter, having a rotor and having a stator. An angular position of the rotor with respect to the stator is determined. The angular position is used to determine a ripple within the torque, which ripple can be expected on the basis of the commutation. The motor current is adapted such that the amplitude of the ripple that can be expected remains below a determined limit value.

First claim

The invention claimed is:

1. A method for operating a brushed commutator motor of an adjusting drive of a motor vehicle, the brushed commutator motor having a rotor and a stator, which comprises the steps of:
determining an angular position of the rotor with respect to the stator on a basis of a sensor signal of a position sensor;
determining an expected ripple of a torque that is to be expected as a result of commutation from the angular position, a point in time of the expected ripple is determined from a point in time of the sensor signal and a quotient between a reference value and a rotational speed; and
adjusting a motor current such that an amplitude of the expected ripple remains below a specific threshold value.

2. The method according to claim 1 ,
wherein an angle that corresponds to a circle arc of a segment of a commutator is used as the reference value.

3. The method according to claim 2 , which further comprises using one of an anisotropic magneto-resistive sensor or a Hall sensor as a component of the position sensor.

4. The method according to claim 2 , which further comprises reading out the reference value from a non-volatile memory device of a motor electronic system.

5. The method according to claim 2 , which further comprises determining the reference value on a basis of a current ripple that is present in the motor current prior to adjusting the motor current.

6. An adjusting drive of a motor vehicle, comprising:
a position sensor outputting a sensor signal;
a brushed commutator motor having a rotor and a stator and configured to:
determine an angular position of said rotor with respect to said stator on a basis of the sensor signal of said position sensor;
determine an expected ripple of a torque that is to be expected as a result of commutation from the angular position, a point in time of the expected ripple is determined from a point in time of the sensor signal and a quotient between a reference value and a rotational speed; and
adjusting a motor current such that an amplitude of the expected ripple remains below a specific threshold value.

7. The adjusting drive according to claim 6 , wherein the adjusting drive is a window lifter.

Assignees

• Brose Fahrzeugteile

Inventors

• Scholz Marcus
• Uebelein Joerg
• Thomann Christian
• Weingaertner Thomas

Classifications

• E05Y2900/55

  Windows · CPC title

• H02P29/50

  Reduction of harmonics · CPC title

• H02P2205/05

  Torque loop, i.e. comparison of the motor torque with a torque reference · CPC title

• H02P7/285 Primary

  controlling armature supply only · CPC title

• H02P7/2805 Primary

  whereby the speed is regulated by measuring the motor speed and comparing it with a given physical value · CPC title