WO2010124573A1 - Anneau conducteur magnétique - Google Patents

Anneau conducteur magnétique Download PDF

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Publication number
WO2010124573A1
WO2010124573A1 PCT/CN2010/071942 CN2010071942W WO2010124573A1 WO 2010124573 A1 WO2010124573 A1 WO 2010124573A1 CN 2010071942 W CN2010071942 W CN 2010071942W WO 2010124573 A1 WO2010124573 A1 WO 2010124573A1
Authority
WO
WIPO (PCT)
Prior art keywords
ring
magnetic
conductive ring
segments
magnetic field
Prior art date
Application number
PCT/CN2010/071942
Other languages
English (en)
Chinese (zh)
Inventor
郝双晖
郝明晖
Original Assignee
浙江关西电机有限公司
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 浙江关西电机有限公司 filed Critical 浙江关西电机有限公司
Publication of WO2010124573A1 publication Critical patent/WO2010124573A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
    • G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
    • G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
    • G01D5/142—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices
    • G01D5/145—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage using Hall-effect devices influenced by the relative movement between the Hall device and magnetic fields
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
    • G01D2205/00—Indexing scheme relating to details of means for transferring or converting the output of a sensing member
    • G01D2205/40—Position sensors comprising arrangements for concentrating or redirecting magnetic flux

Definitions

  • the present invention relates to a magnetic element, and in particular to a magnetically permeable ring. Background technique
  • the position detecting device applied in the field of motor control is mainly an encoder, and the encoder is a position sensor that converts a physical quantity such as a rotational angular position and an angular velocity of the motor into an electrical signal, and the manufacture of the encoder and the level of signal processing directly affect The level of automation.
  • the encoders used in the field of engineering technology are mainly photoelectric encoders, and the photoelectric encoders are available in both incremental and absolute modes.
  • the incremental encoder when the axis rotates, the grating disk rotates, and the light emitted by the light-emitting element is cut into intermittent light by the slit of the grating disk, and then the receiving component receives and outputs a corresponding pulse signal, the direction of rotation and the number of pulses. It needs to be implemented by means of a decision circuit and a counter.
  • the starting point of the counting can be set arbitrarily.
  • the rotary incremental encoder rotates, the pulse is output, and the position is memorized by the internal storage unit of the counting device. However, during the operation of the encoder, no interference is allowed and the pulse is lost. Otherwise, the zero point remembered by the counting device is offset and is unknown.
  • the absolute encoder outputs a code that corresponds to the position one by one.
  • the change in the size of the code can determine the direction of rotation and the current position of the rotor. This greatly improves the immunity to interference and the reliability of the data.
  • Absolute encoders have been increasingly used for angle measurement, length measurement and position control in various industrial systems.
  • Photoelectric encoders are made of glass materials by scribe lines, which are not strong against vibration and impact, and are not suitable for harsh environments such as dust and condensation, and complicated in structure and positioning. There is a limit to the line spacing. To increase the resolution, the code wheel must be increased, which makes it difficult to achieve miniaturization. High assembly accuracy must be ensured in production, which directly affects production efficiency and ultimately affects product cost.
  • the stator and rotor of the conventional magnetoelectric sensor are made of pure iron, and permanent magnets are fixed on the stator to form a magnetic circuit system.
  • the opposite end faces of the stator and the rotor are uniformly provided with an equal number of teeth and slots, the rotor is fixed to the main shaft, the main shaft is connected with the measured rotating shaft, the main shaft drives the rotor to rotate, and when the rotor teeth and the stator teeth are opposite, the air gap is minimum.
  • the magnetic flux is the largest. When the rotor teeth and the stator slots are opposite, the air gap is the largest and the magnetic flux is the smallest.
  • the change in the magnetic flux can be detected by, for example, a magnetic induction sensor, and the change can be converted into an electrical signal pulse.
  • the patent CN 200410024190.7 discloses a magnetoelectric encoder structure having two, three, four and six sensors, as shown in FIGS. 1A to 1D, in the structure of the magnetoelectric encoder, the surface of the magnetic induction element is used
  • the method of attaching that is, arranging a magnetic induction element on the inner side wall of the annular stator, sensing the rotating magnetic field, and then determining the rotation angle value based on the sensor voltage value.
  • the inner side of the stator is generally circular and smooth, and the sensor is not easy to install and fix. It is easy to cause positioning error, which causes phase deviation of the signal, which makes the high-order harmonic component of the signal large.
  • the processing and manufacturing process is complicated, which is not conducive to industrialization;
  • the tensile strength of the contact with the processing body is not high, and it is easy to be broken, which increases the processing difficulty and affects the life of the product;
  • the induced magnetic field leaks greatly, and the magnetic field cannot be fully applied, which makes the noise in the signal large and affects the measurement accuracy;
  • the sensor is required to be small in size, resulting in a relatively high product cost.
  • the technical problem to be solved by the present invention is that, in view of the above-mentioned deficiencies of the prior art, a magnetically permeable ring is proposed, which can simplify the production process, improve signal accuracy, reduce product cost, and improve cost performance.
  • the present invention proposes a magnetic conductive ring, which is composed of two or more segments of the same radius and the same center, and gaps are left between the adjacent two arc segments.
  • the magnetic conductive ring is composed of two arc segments of the same radius and the same center, which are respectively a quarter arc segment and a 3/4 arc segment; or, the magnetic conductive ring is composed of three arcs of the same radius
  • the segments are respectively composed of 1/3 arc segments; or, the magnetic conductive ring is composed of four arc segments of the same radius, which are respectively 1/4 arc segments; or, the magnetic conductive ring is composed of six segments of the same radius
  • the arc segments are composed of 1/6 arc segments.
  • the end portion of the arc of the magnetic flux ring is chamfered; specifically, the chamfer is a chamfer formed by cutting in the axial direction or the radial direction or both in the axial direction and the radial direction.
  • the magnetic flux ring of this structure By using the magnetic flux ring of this structure, the magnetic field inside the magnetic flux ring is evenly distributed, the leakage is small, and the signal induced by the magnetic induction element is integral, the signal noise is small, and the components of the higher harmonic components are small, which is conducive to improving the original. Signal quality, improve signal to noise ratio. Moreover, the effective area is reduced by increasing the chamfer of the magnetic flux ring, which is beneficial to increase the magnetic field strength induced on the surface of the magnetic induction element, and can reduce the size requirement of the permanent magnet to a certain extent, and can reduce Small mechanical size of the entire encoder.
  • FIGS. 1A to 1D are schematic structural views of a magnetoelectric encoder in the prior art
  • Figure 3 is an exploded perspective view showing a magnetoelectric sensor provided with a magnetically permeable ring of the present invention
  • Figure 4 is a perspective view of the magnetically permeable ring of the present invention mounted on a skeleton
  • Figure 5 is a schematic view showing the structure of an application example 1 when the magnetic permeability ring of the present invention is divided into two sections;
  • FIG. 6 is a schematic structural view of an application example 2 when the magnetic permeability ring of the present invention is divided into four segments;
  • Figure 7 is a schematic view showing the structure of an application example 3 when the magnetically permeable ring of the present invention is divided into three sections;
  • Fig. 8 is a view showing the configuration of an application example 4 in which the magnetically permeable ring of the present invention is divided into six segments. detailed description
  • the magnetic flux ring is composed of two or more segments of the same radius and the same center.
  • the magnetic ring shown in Fig. 2A has no chamfer design, and the arc shown in Fig. 26 to Fig. 2D
  • the end portion of the segment is chamfered, and the chamfer is a chamfer formed by cutting in the axial direction (Fig. 2B) or the radial direction (Fig. 2C) or simultaneously in the axial direction and the radial direction (Fig. 2D), and 151, 154 indicate The axial section, 152, 153, represents the radial section.
  • a gap is left between two adjacent arc segments, and a magnetic induction element is placed in the gap.
  • the magnetic induction element converts the sensed magnetic signal into a voltage signal, and This voltage signal is transmitted to the corresponding controller.
  • ⁇ it can be known that when it is determined, it can be increased by 3 by decreasing. Since the magnetic flux generated by the permanent magnet is constant, S is large in the magnetically permeable ring, so ⁇ is relatively small, so that heat generation due to alternating magnetic fields can be reduced. The increased chamfer of the magnetically permeable ring reduces the area of the end of the magnetically permeable ring, and the magnetic field strength of the end portion can be increased, so that the output signal of the magnetic induction element is enhanced.
  • Such a signal pickup structure has a simple manufacturing process, low signal noise picked up, low production cost, high reliability, and small size.
  • Fig. 3 is an exploded perspective view showing a magnetoelectric sensor provided with a magnetic flux guide of the present invention.
  • Fig. 4 is a perspective view showing the magnetic flux ring of the present invention mounted on a skeleton.
  • the magnetoelectric sensor is composed of a magnetic induction element board 102, a magnetic steel ring 103, a magnetic conductive ring 104, and a skeleton 105.
  • the magnetic induction element board 102 is composed of a PCB board and a magnetic induction element 106, and the magnetic induction element board 102 A connector 108 is also mounted thereon.
  • the magnetic steel ring 103 is mounted on the motor shaft, and the magnetic flux ring 104 is fixed to the bobbin 105, and the bobbin 105 is fixed at a suitable position of the motor.
  • the magnetic steel ring 103 rotates to generate a sinusoidal magnetic field, and the magnetic conductive ring 104 acts as a magnetism, and the magnetic flux generated by the magnetic steel ring 103 passes through the magnetic conductive ring 104.
  • the magnetic induction element 106 fixed on the PCB converts the magnetic field passing through the magnetic flux ring 104 into a voltage signal and outputs it, and the voltage signal directly enters the main control board chip. The voltage signal is processed by the chip on the main control board, and finally the angular displacement is obtained.
  • the magnetic flux ring 104 is disposed on the skeleton forming mold, and is fixed to the skeleton 105 when the skeleton is integrally formed.
  • Fig. 5 is a view showing an application example 1 in the case where the magnetically permeable ring of the present invention is divided into two sections.
  • the magnetic flux ring is composed of two arc segments of the same radius, which are respectively a quarter arc segment 111 and a 3/4 arc segment 112, and the positions A and B are at an angle of 90° and are slit.
  • the two magnetic sensing elements 109, 110 are respectively placed in the slits at A and B.
  • the use of this structure is advantageous for reducing magnetic field leakage, increasing the magnetic flux induced by the magnetic induction element, and since the magnetic flux induced by the magnetic surface is the integral of the magnetic field, Therefore, there is a use of reducing signal noise to neutralize higher harmonics in the signal.
  • the specific process of signal processing is not described in detail here.
  • a magnetically permeable ring composed of two arc segments 111, 112 of the same radius is mounted concentrically with the magnetic steel ring 113.
  • Fig. 6 is a second application example 2 when the magnetically permeable ring of the present invention is divided into four sections.
  • the magnetic flux ring is composed of four segments of the same radius of 1/4 arc segments 118, 119, 120 and 121, and the four positions A, B, C, and D are sequentially separated by 90 degrees, and each has a narrow Seam.
  • Four magnetic sensing elements 114, 115, 116 and 117 are respectively placed at the slits, B, C and D.
  • This structure is advantageous for reducing magnetic field leakage, increasing the magnetic flux induced by the magnetic induction element, and the magnetic flux induced by the magnetic surface is a magnetic field.
  • the integral therefore, is utilized to reduce signal noise and harmonics in the signal.
  • the specific process of signal processing is not described in detail here.
  • the four-section 1/4 arc segments 118, 119, 120, and 121 of the same radius are concentrically mounted with the magnetic ring and the magnetic steel ring 122.
  • Fig. 7 is a third application example 3 when the magnetically permeable ring of the present invention is divided into three sections.
  • the magnetic flux ring consists of three segments and the same half.
  • the 1/3 arc segments 126, 127 and 128 of the diameter are formed, and the three positions A, B and C are 120° apart from each other, and a slit is opened, and three sensors 123, 124 and 125 are respectively placed at the slits, and this is used.
  • the structure is beneficial for reducing the magnetic field leakage, increasing the magnetic flux induced by the sensor, and since the magnetic flux induced by the sensor surface is the integral of the magnetic field, there is a use of reducing the signal noise to the higher harmonics in the signal.
  • the specific process of signal processing is not described in detail here.
  • the magnetic conductive ring and the magnetic steel ring 129 composed of three segments of the 1/3 arc segments 126, 127 and 128 of the same radius are concentrically mounted.
  • Fig. 8 is a view showing an application example 4 in the case where the magnetically permeable ring of the present invention is divided into six segments.
  • the magnetic flux ring is composed of six segments of the same radius 1/6 arc segments 136, 137, 138, 139, 140 and 141, and the six positions A, B, C, D, E, F are 60 degrees apart. °, and both have a slit, and six sensors 130, 131, 132, 133, 134, and 135 are respectively placed in the slits, and the structure is used to reduce magnetic field leakage, increase the magnetic flux induced by the sensor, and sense the surface of the sensor.
  • the magnetic flux is the integral of the magnetic field, so there is a use of lowering the signal noise to sum the higher harmonics in the signal.
  • the specific process of signal processing is not described in detail here.
  • the non-load output end of the motor is provided with a permanent magnet ring, and the magnetic flux ring and the magnetic steel ring 142 composed of six segments of the same radius 1/6 arc segments 136, 137, 138, 139, 140 and 141 are concentrically mounted.
  • the magnetic flux rings of the above four embodiments can be used in any of the chamfered forms of Figs. 2C-2D.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Transmission And Conversion Of Sensor Element Output (AREA)

Abstract

L'invention concerne un anneau conducteur magnétique, à deux ou plus de deux segments d'arc de même rayon et de même centre, ces segments comportant un intervalle d'air. La distribution homogène du champ magnétique dans ledit anneau, la fuite de flux mineure, le signal de type intégral induit par l'élément sensible au champ magnétique, le faible bruit de signal et la composante des harmoniques plus hautes ainsi que la qualité de signal originale améliorée et le rapport signal/bruit résultent de la mise en oeuvrede cette structure d'anneau conducteur magnétique. En outre, aucune exigence stricte ne s'applique à la dimension mécanique de l'élément sensible au champ magnétique et l'on eut choisir des types de plus grande largeur, et même le circuit amplificateur de suivi peut être omis. Une telle structure est donc avantageuse en ce qu'elle permet de réduire les coûts de production et d'améliorer le rapport coût/rendement.
PCT/CN2010/071942 2009-04-30 2010-04-20 Anneau conducteur magnétique WO2010124573A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN2009101377697A CN101877267B (zh) 2009-04-30 2009-04-30 一种导磁环
CN200910137769.7 2009-04-30

Publications (1)

Publication Number Publication Date
WO2010124573A1 true WO2010124573A1 (fr) 2010-11-04

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PCT/CN2010/071942 WO2010124573A1 (fr) 2009-04-30 2010-04-20 Anneau conducteur magnétique

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CN (1) CN101877267B (fr)
WO (1) WO2010124573A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113937979A (zh) * 2021-03-11 2022-01-14 国家电投集团科学技术研究院有限公司 永磁齿轮变速装置

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103474196B (zh) * 2013-08-28 2016-09-28 昆山佑翔电子科技有限公司 组合磁环

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2182497Y (zh) * 1994-01-22 1994-11-09 朱杰 导磁式编码器
US5861745A (en) * 1995-09-29 1999-01-19 Robert Bosch Gmbh Measuring device for contactless determination of relative angular position with an improved linear range
CN1704723A (zh) * 2004-06-03 2005-12-07 威海华控电工有限公司 四传感器式编码装置

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Publication number Priority date Publication date Assignee Title
DE19716985A1 (de) * 1997-04-23 1998-10-29 A B Elektronik Gmbh Vorrichtung zur Ermittlung der Position und/oder Torsion rotierender Wellen
CN2880170Y (zh) * 2006-01-12 2007-03-21 林丽裡 改进的磁控轮的导磁环结构
CN201503740U (zh) * 2009-04-30 2010-06-09 浙江关西电机有限公司 一种导磁环

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2182497Y (zh) * 1994-01-22 1994-11-09 朱杰 导磁式编码器
US5861745A (en) * 1995-09-29 1999-01-19 Robert Bosch Gmbh Measuring device for contactless determination of relative angular position with an improved linear range
CN1704723A (zh) * 2004-06-03 2005-12-07 威海华控电工有限公司 四传感器式编码装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113937979A (zh) * 2021-03-11 2022-01-14 国家电投集团科学技术研究院有限公司 永磁齿轮变速装置
CN113937979B (zh) * 2021-03-11 2023-03-14 国家电投集团科学技术研究院有限公司 永磁齿轮变速装置

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CN101877267A (zh) 2010-11-03
CN101877267B (zh) 2013-01-02

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