Method for determining a corrected rotational speed signal, and electric motor arrangement

A speed signal and motor technology, applied to devices using electric/magnetic methods, using electric/magnetic devices to transmit sensing components, measuring devices, etc., can solve problems such as hindering precise adjustment of motors

Active Publication Date: 2018-06-08
SCHAEFFLER TECH AG & CO KG
View PDF10 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the angle signal and thus also the speed signal can have disturbances that prevent precise regulation of the electric motor

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for determining a corrected rotational speed signal, and electric motor arrangement
  • Method for determining a corrected rotational speed signal, and electric motor arrangement
  • Method for determining a corrected rotational speed signal, and electric motor arrangement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0056] figure 1 The course of the rotational angle signal 01 output by the commutation sensor is shown, which shows the magnetic field angle as a function of time and is represented as a solid line. Correspondingly, the ideal rotational angle signal 02 is shown as a dashed line. In each revolution from -π to +π, the rotational angle signal 01 wipes out a complete cycle. A comparison between the ideal rotation angle signal 02 and the measured rotation angle signal 01 shows that the commutation sensor receives a small rotation angle error 03 (at figure 2 shown in ), which oscillates around the ideal rotational angle signal 02 similarly to a sinusoidal interference signal on the rotational angle signal 01 .

[0057] figure 2 The rotational angle error 03 is shown as a function of time as a magnetic field angle difference. Furthermore, raw rotational speed signal 04 is shown, which is obtained according to the invention by differentiating rotational angle signal 01 . It can...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The present invention relates to a method for determining a corrected rotational speed signal and to an electric motor arrangement. In one step of the method, a periodic rotational angle signal havinga rotational-angle-dependent, periodic rotational angle error is determined. The rotational angle signal is converted into a digital raw rotational speed signal (16) which, on account of the rotational angle error, has an interference ripple, the period duration of which corresponds to the period duration of the rotational angle error. The digital raw rotational speed signal (16) comprises a plurality of sampled values (07) which are spaced apart in terms of time by a sampling period duration. Half the period duration of the interference ripple of the raw rotational speed signal (16) is determined. An average is calculated for at least one pair of sampled values (07) of the raw rotational speed signal (16), the temporal spacing of said values being the determined half period duration of the interference ripple of the raw rotational speed signal (16), apart from a temporal discretization error. An average value is obtained from the average calculation. A correction value which is dependent on the sampling period duration and on the frequency of the interference ripple is formed in order to take the discretization error into account. The corrected rotational speed signal is formed from a difference between the average value and the correction value. The correction signal varies in a sawtooth-shaped manner on the basis of the deviation of the sampling period duration from the period duration of the interference ripple, and the maximum amplitude of the correction signal also increases with the frequency of the interference ripple.

Description

technical field [0001] The invention firstly relates to a method for determining a corrected rotational speed signal. The method is especially suitable for accurately determining the rotational speed of rotary electric machines. The invention also relates to an electric motor arrangement in which the method according to the invention is used. Background technique [0002] However, an exact speed signal is especially required in electric motors for drives, which are regulated more accurately than with conventional block commutation. The speed signal can be known via the angle signal, which can be detected with a commutation sensor. However, the angle signal and thus also the speed signal can have disturbances which prevent precise regulation of the electric motor. Solutions are known in the prior art with which these disturbances are to be corrected by correction values ​​known in advance. [0003] DE 102 60 862 A1 shows a method for correcting a sensor device for measuri...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01P21/02G01P3/44G01D5/244
CPCG01P3/44G01P21/02G01D5/145G01D5/24476G01D5/2448G01P3/48
Inventor 本雅明·考夫纳
Owner SCHAEFFLER TECH AG & CO KG
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap