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System for determining at least one rotation parameter of a rotating member

A technology for rotating components and rotating parameters, applied in the system field of at least one rotating parameter, can solve problems such as unfavorable encoder integration, complicated magnetization methods, etc.

Pending Publication Date: 2020-09-22
TORRINGTON COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This hinders the integration of encoders on small areas and complicates the magnetization method since a greater thickness of material must be magnetically saturated

Method used

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  • System for determining at least one rotation parameter of a rotating member
  • System for determining at least one rotation parameter of a rotating member
  • System for determining at least one rotation parameter of a rotating member

Examples

Experimental program
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Embodiment Construction

[0023] In connection with these figures, a system for determining at least one rotational parameter of a rotating member relative to a fixed structure is described. In particular, the parameters of the rotating member may be selected from its position, its speed, the direction of its rotation, its acceleration or the direction of its movement (in particular the axis).

[0024] In a particular application, the system can be used in connection with the control of a brushless direct current motor, notably making it possible to know the absolute angular position of a pair of motor poles of the rotor with respect to the stator.

[0025] The system for determining comprises an encoder 1 intended to be integrally formed with a rotating member so as to move therewith, said encoder comprising a body having a cylindrical periphery of radius a around the axis of rotation X, in On it is formed a magnetic track 2 capable of emitting a periodic magnetic field representing the rotation of sa...

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Abstract

The invention relates to a system for determining at least one rotation parameter of a rotating member. The invention relates to a system comprising a coder that has an alternation of North and Southmagnetic poles (2n, 2s) separated by transitions (3) extending along an helix of pitch p and of angle alpha. The magnetic track has Npp pairs of North and South poles (2n, 2s) and a polar width Lp measured along a normal (N) to the transitions (3) which are: Npp=[pi]a / I and Lp=p*cos[alpha]. The system also includes a sensor able to detect the period magnetic field emitted by the coder by means ofat least two sensitive magnetic elements (41, 42; 51, 52) which are disposed at a radial reading distance from the magnetic track (2). The sensitive elements are disposed in relation to one another todeliver signals in quadrature.

Description

technical field [0001] The invention relates to a system for determining at least one rotational parameter of a rotating member, said system comprising an encoder emitting a periodic magnetic field and a sensor capable of detecting said magnetic field. Background technique [0002] In many applications it is desirable to know at least one rotational parameter of a rotating member, such as its position, its velocity, its acceleration or its direction of movement, in real time and with optimal quality. [0003] For this purpose, document WO-2006 / 064169 proposes the use of an encoder intended to be integrated with a mobile member and to form a track on it capable of reading distances from a sensor comprising several sensitive elements emits a pseudo-sinusoidal magnetic field. [0004] Advantageously, each sensitive element may comprise at least one pattern with a substrate of tunneling magnetoresistive (TMR) material, the resistance of which varies depending on the detected ma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R33/07G01R33/09
CPCG01R33/07G01R33/093G01R33/096G01R33/098G01D5/2451G01D5/24438G01D5/145G01D5/142G01D5/16
Inventor C·杜莱特C·弗拉米尔E·范达姆
Owner TORRINGTON COMPANY
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