EP2225475A2 - Ensemble capteur pour un arbre logé dans un palier magnétique - Google Patents

Ensemble capteur pour un arbre logé dans un palier magnétique

Info

Publication number
EP2225475A2
EP2225475A2 EP08801291A EP08801291A EP2225475A2 EP 2225475 A2 EP2225475 A2 EP 2225475A2 EP 08801291 A EP08801291 A EP 08801291A EP 08801291 A EP08801291 A EP 08801291A EP 2225475 A2 EP2225475 A2 EP 2225475A2
Authority
EP
European Patent Office
Prior art keywords
magnetic
shaft
sensor arrangement
coding
arrangement according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08801291A
Other languages
German (de)
English (en)
Inventor
Carsten Duppe
Harald Grab
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schaeffler Technologies AG and Co KG
Original Assignee
Schaeffler Technologies AG and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Schaeffler Technologies AG and Co KG filed Critical Schaeffler Technologies AG and Co KG
Publication of EP2225475A2 publication Critical patent/EP2225475A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C32/00—Bearings not otherwise provided for
    • F16C32/04—Bearings not otherwise provided for using magnetic or electric supporting means
    • F16C32/0406—Magnetic bearings
    • F16C32/044—Active magnetic bearings
    • F16C32/0444—Details of devices to control the actuation of the electromagnets
    • F16C32/0446—Determination of the actual position of the moving member, e.g. details of sensors

Definitions

  • the invention relates to a sensor arrangement according to claim 1 for a shaft mounted in a magnetic bearing.
  • WO 2006/013092 A1 describes a sensor arrangement for a supported shaft, wherein the sensor arrangement comprises a signal generator having a magnetic coding which is designed as a magnetized region formed on the body of the shaft, and a receiver which is embodied as a coil, wherein the coil comprises a change of the magnetic field of the magnetic coding.
  • Mechanical stresses in the body of the shaft cause, due to the magnetostrictive effect, a change in the magnetic field of the magnetic encoding sensed by the receiver, whereby it is indirectly possible to deduce a position of the shaft in the bearing.
  • Such an arrangement is not readily usable for a shaft mounted in a magnetic bearing, since the magnetic field of the magnetic bearing is superimposed with the change in the magnetization of the magnetic coding.
  • the magnetic field of the magnetic bearing changes over time, so that the magnetic bearing superimposes a time-dependent signal on the magnetic field measured by the coil.
  • a further disadvantage is that the described measuring arrangement is only suitable for those waves whose body consists of a magnetizable material, but such waves are influenced by the magnetic field of the magnetic bearing.
  • DE 10 2004 025 387 A1 describes a sensor arrangement for a mounted shaft whose body consists of an electrically conductive, magnetizable material.
  • the sensor arrangement comprises a magnet which is arranged laterally on the body approximately in its middle. If an electric current is conducted through the body of the shaft, a magnetic field is superimposed in the body, which superimposes itself at the location of the magnet with the magnetic field of the magnet, so that at the location of the magnet in the corpus of the shaft due to the magnetostrictive effect Strains in the body of the shaft occur that spread along the body of the shaft and can be detected at one end of the shaft.
  • the structure is generally complex and hardly usable for a shaft mounted in a magnetic bearing shaft, since the magnetic fields of the magnetic bearing constantly changing mechanical stresses in the body of the wave cause, which overlap the actual measurement. Also, only an axial positioning of the shaft, but not a radial position of the shaft can be detected in the camp.
  • the receiver Due to the magnetic shielding and the arrangement of the receiver in the magnetically shielded area, the receiver is not further influenced by the magnetic field of the magnetic bearing.
  • the magnetic coding can then - largely unaffected by the magnetic bearing - determine the position of the shaft. Effects of the magnetic bearing, which have an influence on the magnetization of the body of the shaft, can be detected and separated by an electronics associated with the receiver.
  • the magnetic coding is formed by a magnetized portion of the body of the shaft, so that the shaft does not require any structural changes.
  • the magnetic coding is formed by a coding element which is attached to the body of the shaft. Due to the coding element, the magnetic coding is also to be provided for those waves which consist of a non-magnetizable material. In addition, when forming the coding element, it is possible to provide the magnetic coding both in the axial and in the radial direction, so that the receiver can simultaneously determine the position of the shaft in the axial and in the radial direction.
  • the magnetic coding comprises a resonant circuit and that the receiver detects the magnetic component of the electromagnetic radiation emitted by the resonant circuit.
  • the electromagnetic radiation emitted by the resonant circuit makes it possible to detect the magnetic coding by the receiver, without having to resort to the magnetostrictive effect.
  • the frequency of the radiated electromagnetic radiation can provide additional information that can be further detected and evaluated by the receiver. Starting from the frequency or from the frequency response of the electromagnetic radiation, the receiver can detect disturbing influences, for example due to the geomagnetic field or due to not completely shielded portions of the magnetic field of the magnetic bearing, and suppress it for the downstream evaluation.
  • Coil comprises, and that the coil is inductively coupled to the resonant circuit, wherein the coil is the resonant circuit for radiating the electro excites magnetic radiation.
  • the receiver thus supplies the resonant circuit with electrical energy, in a non-contact manner, without requiring connection by means of cables. If the resonant circuit moves relative to the receiver, inductive coupling will only occur if the plane of the resonant circuit is substantially parallel to a direction defined by the coil.
  • Various resonant circuits which are distributed along the circumference of the shaft, thus respond to a specific coil of the receiver only briefly, so that can be achieved by providing a plurality of resonant circuits or multiple coils increased radial or axial resolution in the position determination.
  • the magnetic shield is formed by a shielding plate; Alternatively or additionally, the magnetic shield can also be formed by an electrically conductive coating, it being understood that the electrically conductive coating is additionally provided on the shielding plate.
  • the magnetic shield may be structurally separate from the receiver; However, the receiver may be arranged in a housing, wherein the housing in turn has a magnetic shielding effect.
  • the magnetically shielding housing of the receiver can replace or supplement the magnetic shield due to the shielding plate or due to the electrically conductive coating, for example, by the housing components of the magnetic field of the magnetic bearing, which is not completely shielded by the shielding or by the electrically conductive coating are away from the receiver.
  • the receiver comprises two half-cylinders which cover the magnetic coding in the radial direction.
  • the two half-cylinders form a housing that covers the magnetic coding along the circumference and thus shields.
  • the half cylinder at least partially covers the magnetic coding in the axial direction, in particular on both sides covered.
  • each of the half cylinders has a substantially U-shaped cross-section.
  • the receiver itself preferably comprises at least one coil which detects the magnetic field of the magnetic coding, and in particular can detect a change in the magnetic field of the magnetic coding. Coils have, in comparison to other magnetic field sensors such as Hall sensors or reed sensors, the advantage of being able to act as a transmitter of electromagnetic radiation, in particular when the magnetic coding is formed by a resonant circuit, the inductively coupled becomes.
  • the magnetic coding can be arranged both on a side surface of the shaft and on an end face of the shaft.
  • Fig. 1 shows an exploded view of an embodiment of a sensor arrangement according to the invention
  • Fig. 2 shows in four part diagrams views of the details of
  • Fig. 1 shows a shaft 1 which is mounted in a magnetic bearing 2.
  • the magnetic bearing 2 comprises a bearing ring 3, which has a groove 4. In the groove 4, a portion of a shielding plate 5 can be inserted.
  • the body 6 of the shaft 1 is made of a non-magnetizable material, for example of a steel with a small amount of chromium.
  • an annular coding element 7 can be fastened, wherein the coding element 7 is shown in two parts in the illustration of FIG. In the mounted position, the coding element 7 is fixed to the body 6 of the shaft 1 by means of press fit.
  • the coding element 7 has a circumferential, radial peripheral surface 8, which points away from the body 6 of the shaft 1, and an axial end face 9, which points away from the bearing ring 3 on.
  • a magnetic coding 10 is provided, which is formed as a sequence of sections of different magnetization both on the end face 9 as well as on the peripheral surface 8.
  • Fig. 1 further shows a receiver 11 with a housing 12 which is formed of two half-cylinders 13.
  • Each of the half cylinders 13 has a U-shaped cross-section, wherein the legs of the U in the mounted position engage over the end face 9 and the further end face of the coding element 7, while the base of the U covers the peripheral face 8 of the coding element.
  • a coil is still arranged, which detects the change in the magnetic field of the magnetization of the coding element 7, as soon as the coding element 7 moves relative to the coil.
  • the shielding plate 5 In the mounted position, the shielding plate 5 is partially received in the groove 4 of the bearing ring 3 and thus the shielding plate 5 is fixed to the bearing ring 3 of the magnetic bearing 2.
  • the coding element 7 At an axial distance from the shielding plate 5, the coding element 7 is joined to the body 6 of the shaft 1 by means of a press fit, and the receiver 11 covers the coding element 7 completely in the circumferential direction and at least partially in the axial direction.
  • the magnetic shield is caused partly by the shielding plate 5, partly by the distance between the coding element 7 and the shielding plate 5 and partly by the housing 12 of the receiver, in the case 12 especially by the partial overlapping of the end faces 9 of the coding element or the covering the peripheral surface 8 of the Codieriatas by the housing 12.
  • the two housing halves 13 have a distance of less than 2 mm to the coding element 7 in order to suppress the influence of magnetic interference fields.
  • Fig. 2 illustrates the embodiment shown in Fig. 1 in its details, while the same or comparable components are provided with the same reference numerals.
  • the left upper partial diagram of Fig. 2 is a schematic plan view of the shaft 1 with the coding element 7 one of the half-cylinder 13 of the housing 12 is shown, in which the receiver 11 is arranged.
  • FIG. 2 shows in the upper right part of the diagram the upper portion of the shielding plate 5. It is understood that the shielding plate 1 shown in one piece in FIG. 1 may also be formed in two parts.
  • Fig. 2 shows in the left lower part of the diagram a side view, with the shaft 1, arranged in the housing 12 with the semicylinders 13 receivers 11 and the supply line 14 for the supply of the receiver 11, and the shielding plate 5 and the magnetic bearing 2 with a bearing ring 3, which receives the body 6 of the shaft 1. Recognizable is the groove 4 in the bearing ring 3, in which the shielding plate 5 is received by means of a peripheral flanging.
  • a half of the coding element 7 is shown, in which at the radial peripheral surface 8 at an axial end face 9, the magnetic coding 10, consisting of a series of rotating areas with different magnetization or on a sequence of Areas is formed with existing or missing magnetization.
  • the coding element 7 was formed as a hollow cylinder and fixed to the side surface of the body 6 of the shaft 1. It is understood that a coding can also be arranged on the end face of the shaft 1 and, for example, is circular, wherein the magnetized portions are formed in a circular segment. It is further understood that a combination of a circular and a hollow cylindrical part existing coding element can be provided that is mounted over an end portion of the shaft 1.
  • the sensor arrangement with the shielding plate 5, the coding ring 7 and the receiver 11 outside the magnetic bearing 2 was arranged immediately adjacent to the bearing ring 3. It is understood that the sensor arrangement can also be arranged in the magnetic bearing 2, for example between the bearing ring 2 and a further bearing ring of the magnetic bearing 2; In this case, magnetic shields should then be provided on both sides of the two bearing rings.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Magnetic Bearings And Hydrostatic Bearings (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)

Abstract

L'invention concerne un ensemble capteur pour un arbre (1) logé dans un palier magnétique (2), lequel ensemble comprend un blindage magnétique qui protège le palier magnétique (2) en formant une zone blindée magnétiquement, un codage magnétique (10), placé sur l'arbre (1) dans la zone blindée magnétiquement, et au moins un récepteur (11) qui détermine au moins une modification d'un champ magnétique du codage magnétique (10). L'objectif de l'invention est de fournir un ensemble capteur pour un arbre (1) logé dans un palier magnétique (2), lequel ensemble permet de déterminer la position de l'arbre (1) en un point le plus proche possible du palier magnétique (2) à l'aide d'un codage magnétique (10) de l'arbre (1). Cet objectif est atteint par l'ensemble capteur susmentionné.
EP08801291A 2007-09-08 2008-09-03 Ensemble capteur pour un arbre logé dans un palier magnétique Withdrawn EP2225475A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007042920A DE102007042920A1 (de) 2007-09-08 2007-09-08 Sensoranordnung für eine in einem Magnetlager gelagerte Welle
PCT/DE2008/001484 WO2009030221A2 (fr) 2007-09-08 2008-09-03 Ensemble capteur pour un arbre logé dans un palier magnétique

Publications (1)

Publication Number Publication Date
EP2225475A2 true EP2225475A2 (fr) 2010-09-08

Family

ID=40340076

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08801291A Withdrawn EP2225475A2 (fr) 2007-09-08 2008-09-03 Ensemble capteur pour un arbre logé dans un palier magnétique

Country Status (5)

Country Link
US (1) US8330455B2 (fr)
EP (1) EP2225475A2 (fr)
JP (1) JP2010538281A (fr)
DE (1) DE102007042920A1 (fr)
WO (1) WO2009030221A2 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007043392A1 (de) * 2007-09-12 2009-03-19 Schaeffler Kg Messanordnung für eine gelagerte Welle
DE102009021081B4 (de) * 2008-07-18 2017-07-06 Asm Automation Sensorik Messtechnik Gmbh Magnetischer Winkelsensor
DE102013225897A1 (de) * 2013-12-13 2015-06-18 Continental Teves Ag & Co. Ohg Induktiver Sensor mit einem beliebig langen Messweg
EP2980429A1 (fr) * 2014-07-28 2016-02-03 Skf Magnetic Mechatronics Dispositif de détection de position améliorée de biopuce AMB
EP3683464B1 (fr) 2019-01-21 2022-03-02 Ingersoll-Rand Industrial U.S., Inc. Dispositif de palier magnétique actif
US11739617B2 (en) 2020-05-28 2023-08-29 Halliburton Energy Services, Inc. Shielding for a magnetic bearing in an electric submersible pump (ESP) assembly
US11512707B2 (en) 2020-05-28 2022-11-29 Halliburton Energy Services, Inc. Hybrid magnetic thrust bearing in an electric submersible pump (ESP) assembly
US11460038B2 (en) 2020-05-28 2022-10-04 Halliburton Energy Services, Inc. Hybrid magnetic radial bearing in an electric submersible pump (ESP) assembly
CN113805126B (zh) * 2021-10-09 2024-06-28 深圳市资福医疗技术有限公司 磁场测量设备
CN115684633B (zh) * 2022-12-30 2023-03-10 四川新川航空仪器有限责任公司 一种磁转速传感器

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4473259A (en) * 1980-12-24 1984-09-25 The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration Linear magnetic bearings
JP2001077446A (ja) * 1999-09-07 2001-03-23 Nsk Ltd エキシマレーザ装置
JP4028971B2 (ja) * 2001-08-28 2008-01-09 アルプス電気株式会社 磁気センサの組立方法
WO2003069270A1 (fr) * 2002-02-14 2003-08-21 Bvr Technologies Company Procedes et appareil de detection de la position angulaire d'un arbre en rotation
DE102004025387B4 (de) 2004-05-17 2011-05-05 Balluff Gmbh Magnetostriktive Wegaufnehmervorrichtung
DK1774271T3 (da) 2004-08-02 2009-03-02 Nct Engineering Gmbh Sensor
EP2161583A3 (fr) * 2004-09-15 2010-03-17 Ntn Corporation Dispositif de roulement à capteur rotatif

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2009030221A3 *

Also Published As

Publication number Publication date
US8330455B2 (en) 2012-12-11
WO2009030221A3 (fr) 2009-05-07
US20100201353A1 (en) 2010-08-12
WO2009030221A2 (fr) 2009-03-12
DE102007042920A1 (de) 2009-03-12
JP2010538281A (ja) 2010-12-09

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