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Method and device for determining the rotary position of a rotating element

A technology of rotating elements, rotating positions

Active Publication Date: 2012-09-05
APTIV TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Here, especially sensorless measuring systems are susceptible to corresponding disturbances

Method used

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  • Method and device for determining the rotary position of a rotating element
  • Method and device for determining the rotary position of a rotating element
  • Method and device for determining the rotary position of a rotating element

Examples

Experimental program
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Effect test

Embodiment Construction

[0040] figure 1 An example of an erroneous frequency waveform f1 as a result of sensorless measurement and an exemplary corrected frequency waveform fk1 are shown. Here, plot the relevant signal amplitude over time.

[0041] figure 2 An example of the output signal rh1 of the pulsation counter filter for detecting current pulsation in the armature current As is shown. Here, in addition to the armature current As, the corresponding frequency signal or frequency waveform f1 is also shown, and the corrected frequency signal or corrected frequency waveform fk1 is shown in the area where the error occurs. Here, in this case, the amplitudes of the individual signals over time are shown again.

[0042] Related equipment for determining the rotational position of a rotating element assigned to or driven by a motor, especially a DC commutated motor, includes a device for detecting current pulsation contained in the armature current of the motor. Here, the device may include, for example,...

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PUM

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Abstract

The invention relates to a method for determining the rotary position of rotating element associated with an electric motor and particularly a commutating DC motor and driven by the same, wherein the ripple current present in the armature current of the electric motor is detected and the number of revolutions of the rotating element is determined as a function of the number of current ripples, the time duration between each successive detected current ripple being continuously measured and the frequency of the detected ripple current being determined by the reciprocal value thereof, in order to detect errors in the ripple current detection. Whenever an unallowable change in the frequency signal resulting from the frequency-time curve exceeding a prescribed value occurs, a fault in the ripple detection is suggested. The waveform of the frequency signal is corrected in the region of the detected unallowable change, particularly using a probable waveform resulting from the remaining measured data. The number of revolutions of the rotating element is then determined using the corrected frequency signal.

Description

Technical field [0001] The present invention relates to a method for determining the rotational position of a rotating element assigned to or driven by a motor, such as in particular a DC commutated motor, in which the current ripple contained in the armature current of the motor is detected, And the number of revolutions of the rotating element is determined according to the number of current pulses. [0002] The invention also relates to a device of the type specified in the preamble of claim 1. Background technique [0003] This type of method and equipment are known, for example, from WO 02 / 095924 A1. [0004] In addition to the DC component, the armature current signal of the DC commutated motor also includes an AC component superimposed on the DC component, which is generated by the interaction of a magnet or a magnetic field, an armature winding, and a commutator. Here, the pulsation of the armature current signal is based on a corresponding short-term change in the induced ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01D3/02G01D5/244
CPCH02P7/0094G01D5/24476G01D3/021
Inventor M·S·海因里希
Owner APTIV TECH LTD
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