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

A technology of rotating elements and rotating positions, which is applied to electrical elements, special recording/indicating devices, and transmission of sensing components using electromagnetic/magnetic devices. Effect

Active Publication Date: 2011-01-26
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 measurements and an exemplary corrected frequency waveform fk1 are shown. Here, the associated signal amplitudes are plotted over time.

[0041] figure 2 An example of an output signal rh1 of a ripple counting filter for detecting current ripples in the armature current As is shown. In this case, the corresponding frequency signal or frequency waveform f1 is shown in addition to the armature current As, and the corrected frequency signal or corrected frequency waveform fk1 is shown in the region of the error. Here again, in this case, the amplitudes of the individual signals over time are shown.

[0042] A related device for determining the rotational position of a rotary element assigned to or driven by an electric machine, in particular a DC commutated electric machine, includes means for detecting current ripples contained in the armature current of the electric machine. Here, th...

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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 invention relates to a method for determining the rotational position of a rotary element assigned to or driven by an electric motor, for example, in particular a DC commutated electric motor, wherein current ripples contained in the armature current of the electric motor are detected, And the number of revolutions of the rotary element is determined from the number of current pulsations. [0002] The invention also relates to a device of the type specified in the preamble of claim 1 . Background technique [0003] A method and a device of this type are known, for example, from WO 02 / 095924 A1. [0004] The armature current signal of a DC commutated motor includes not only a DC component but also an AC component superimposed on the DC component, which is generated by the interaction of the magnet or magnetic field, the armature winding and the commutator. In this case, the pulsation of the armature current signal is based on corresponding short-t...

Claims

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Application Information

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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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