WO2023276488A1 - 回転検出器 - Google Patents

回転検出器 Download PDF

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Publication number
WO2023276488A1
WO2023276488A1 PCT/JP2022/021057 JP2022021057W WO2023276488A1 WO 2023276488 A1 WO2023276488 A1 WO 2023276488A1 JP 2022021057 W JP2022021057 W JP 2022021057W WO 2023276488 A1 WO2023276488 A1 WO 2023276488A1
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WO
WIPO (PCT)
Prior art keywords
rotation axis
magnets
pair
rotation
edge
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.)
Ceased
Application number
PCT/JP2022/021057
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English (en)
French (fr)
Japanese (ja)
Inventor
智行 村西
優紀 田中
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.)
Panasonic Intellectual Property Management Co Ltd
Original Assignee
Panasonic Intellectual Property Management Co Ltd
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 Panasonic Intellectual Property Management Co Ltd filed Critical Panasonic Intellectual Property Management Co Ltd
Priority to CN202280042574.8A priority Critical patent/CN117501072A/zh
Priority to JP2023531708A priority patent/JP7825116B2/ja
Publication of WO2023276488A1 publication Critical patent/WO2023276488A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
    • G01D5/244—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 characteristics of pulses or pulse trains; generating pulses or pulse trains
    • G01D5/245—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 characteristics of pulses or pulse trains; generating pulses or pulse trains using a variable number of pulses in a train

Definitions

  • the present disclosure relates to a rotation detector, and more particularly to a rotation detector that detects rotation of a rotating shaft.
  • Patent Literature 1 discloses a disk-shaped magnet provided on a shaft, and three power generation units each composed of a magnetic wire and a pickup coil. A rotation detector is disclosed that is positioned on each side of a virtual triangle.
  • Patent Document 1 has a problem that the distribution of the magnetic flux density in the longitudinal direction of the power generation section tends to be biased, making it difficult to generate power appropriately.
  • the present disclosure has been made to solve such problems, and aims to provide a rotation detector that facilitates appropriate power generation of the power generation element.
  • a rotation detector includes a pair of magnets that rotate together with a rotating shaft, and a power generation element that generates power by a change in magnetic field caused by the rotation of the pair of magnets together with the rotating shaft.
  • the pair of magnets are spaced apart in a first orthogonal direction that sandwiches the rotation axis of the rotation shaft and is perpendicular to the rotation axis, and satisfies (1) or (2) below.
  • (1) The north and south poles of each of the pair of magnets are aligned in the first orthogonal direction such that the north pole is positioned on one side in the first orthogonal direction.
  • the north and south poles of one of the pair of magnets are aligned in the direction of the rotation axis such that the north pole is positioned on one side in the direction of the rotation axis, and the north pole of the other of the pair of magnets is aligned in the direction of the rotation axis.
  • the pole and the south pole are aligned in the direction of the rotation axis such that the north pole is located on the other side in the direction of the rotation axis.
  • FIG. 1 is a diagram showing a motor provided with a rotation detector according to the first embodiment.
  • 2 is a diagram showing the rotation detector of FIG. 1;
  • FIG. 3 is a diagram showing a pair of magnets of the rotation detector of FIG. 1;
  • FIG. 4 is a diagram showing the relationship between the rotational position of a pair of magnets and the distribution of magnetic flux density in the longitudinal direction of the power generation element.
  • FIG. 5 is a diagram showing the relationship between the rotational position of a pair of magnets and the distribution of magnetic flux density in the longitudinal direction of the power generation element.
  • FIG. 6 is a diagram showing the relationship between the rotational position of a pair of magnets and the distribution of magnetic flux density in the longitudinal direction of the power generation element.
  • FIG. 7 is a diagram showing a rotation detector according to the second embodiment.
  • FIG. 8 is a diagram showing a rotation detector according to the third embodiment.
  • FIG. 9 is a diagram showing a rotation detector according to the fourth embodiment.
  • FIG. 10 is a diagram showing a rotation detector according to the fifth embodiment.
  • FIG. 11 is a diagram showing a rotation detector according to the sixth embodiment.
  • FIG. 12 is a diagram showing a rotation detector according to the seventh embodiment.
  • FIG. 13A is a diagram showing another example of a magnet;
  • FIG. 13B is a diagram showing still another example of a magnet;
  • FIG. 14A is a diagram showing still another example of a magnet;
  • FIG. 14B is a diagram showing still another example of a magnet;
  • each figure is a schematic diagram and is not necessarily strictly illustrated.
  • symbol is attached
  • FIG. 1 shows a motor 1 having a rotation detector 14 according to the first embodiment.
  • FIG. 2 is a diagram showing the rotation detector 14 of FIG.
  • FIG. 3 is a diagram showing a pair of magnets 20, 22 of rotation detector 14 of FIG. Note that FIG. 1 shows the case 12 and the pair of magnets 20 and 22 in cross section. Further, in FIG. 1, illustration of the power generation element 26 and the control circuit 28 is omitted.
  • the motor 1 includes a main body 4, a rotor 6, a stator 8, a rotating shaft 10, a case 12, and a rotation detector 14.
  • the rotation axis direction is the direction in which the rotation axis A of the rotating shaft 10 extends (the direction indicated by arrow X in FIG. 1).
  • the rotor 6 and stator 8 are housed in the main body 4. Rotor 6 rotates with respect to stator 8 .
  • the rotating shaft 10 extends in the direction of the rotation axis and has a rod shape such as a columnar shape.
  • the axis of the rotating shaft 10 and the rotation axis A are aligned.
  • the rotating shaft 10 is fixed to the rotor 6 and rotates about the rotation axis A.
  • the direction of rotation of the rotating shaft 10 (the direction indicated by the arrow Z in FIG. 2) coincides with the circumferential direction about the axis of rotation A.
  • a rotation detector 14 is provided at one end of the rotating shaft 10 in the rotation axis direction.
  • a load (not shown) or the like that is rotationally driven by the rotation of the rotating shaft 10 is attached to the other end of the rotating shaft 10 in the rotation axis direction.
  • the rotating shaft 10 is made of magnetic metal such as iron.
  • the case 12 is attached to the main body 4 so as to cover one end of the rotating shaft 10 in the rotation axis direction and the rotation detector 14 .
  • the case 12 is made of magnetic metal such as iron.
  • the rotation detector 14 detects rotation of the rotating shaft 10 .
  • the rotation detector 14 detects the rotational position of the rotating shaft 10, the rotating direction of the rotating shaft 10, the rotation speed of the rotating shaft 10, and the like.
  • rotation detector 14 is an absolute encoder.
  • the rotation detector 14 is provided at one end of the rotation shaft 10 in the direction of the rotation axis, as described above. As shown in FIGS. 1 and 2, the rotation detector 14 has a rotating plate 16, a substrate 18, a pair of magnets 20 and 22, a plurality of power generation elements 24 and 26, and a control circuit 28. there is
  • the rotating plate 16 extends in a direction orthogonal to the rotation axis direction.
  • the rotating plate 16 has a disc shape having a main surface extending in a direction orthogonal to the rotation axis direction, and is circular when viewed from the rotation axis direction.
  • the rotating plate 16 is attached to one end of the rotating shaft 10 in the rotation axis direction.
  • the axis of the rotary plate 16 and the rotation axis A are aligned. The rotating plate 16 rotates together with the rotating shaft 10 .
  • the substrate 18 extends in a direction orthogonal to the rotation axis direction.
  • the substrate 18 has a disc shape having a main surface perpendicular to the rotation axis direction, and is circular when viewed from the rotation axis direction.
  • the substrate 18 is arranged to be spaced apart from one end of the rotating shaft 10 and the rotating plate 16 in the rotation axis direction, and faces the rotating plate 16 .
  • the axis of the substrate 18 and the rotation axis A are aligned.
  • the substrate 18 is fixed to the inner surface of the case 12 and does not rotate.
  • a pair of magnets 20 and 22 rotate together with the rotating shaft 10 .
  • the pair of magnets 20 and 22 rotate together with the rotating shaft 10 and the rotating plate 16 when the rotating shaft 10 rotates.
  • a pair of magnets 20 , 22 are arranged on the main surface of the rotating plate 16 facing away from the substrate 18 .
  • the pair of magnets 20 and 22 are arranged at positions separated from the plurality of power generation elements 24 and 26 in the rotation axis direction.
  • the pair of magnets 20 and 22 overlap the substrate 18 when viewed from the rotation axis direction.
  • the pair of magnets 20 and 22 are arranged with a gap in a first orthogonal direction (the direction indicated by arrow B in FIG. 2) sandwiching the rotation axis A of the rotation shaft 10 and orthogonal to the rotation axis A. That is, the rotation axis A of the rotation shaft 10 is located between the pair of magnets 20 and 22, forming a space.
  • each of the pair of magnets 20 and 22 are arranged in the first orthogonal direction so that the north pole is positioned on one side in the first orthogonal direction. That is, each of the pair of magnets 20 and 22 is magnetized in the first orthogonal direction.
  • the N pole and S pole of the magnet 20 are arranged in the first orthogonal direction, and the N pole of the magnet 20 is located on one side of the first orthogonal direction relative to the S pole of the magnet 20.
  • the north pole of the magnet 20 is located closer to the axis of rotation A than the south pole of the magnet 20 in the first orthogonal direction.
  • the N pole and S pole of the magnet 22 are arranged in the first orthogonal direction, and the N pole of the magnet 22 is located on one side of the first orthogonal direction relative to the S pole of the magnet 22.
  • the north pole of the magnet 22 is located farther from the axis of rotation A than the south pole of the magnet 22 in the first orthogonal direction.
  • the north and south poles of each of the pair of magnets 20, 22 are aligned in the first orthogonal direction such that the north pole is located in one of the first orthogonal directions. Magnetic fields oriented in one orthogonal direction can be generated (see arrows in FIG. 3).
  • Each of the pair of magnets 20 and 22 is arranged along the rotation direction of the rotating shaft 10 .
  • Each of the pair of magnets 20 and 22 has an arcuate shape along the rotation direction of the rotating shaft 10 .
  • a pair of magnets 20 and 22 are arranged symmetrically with the rotation axis A interposed therebetween.
  • the pair of magnets 20 and 22 have the same shape and are arranged symmetrically in the first orthogonal direction.
  • One ends of the pair of magnets 20 and 22 in a second orthogonal direction (the direction indicated by arrow C in FIG. 2) orthogonal to the rotation axis A and orthogonal to the first orthogonal direction are aligned in a direction parallel to the first orthogonal direction.
  • the magnets 20 and 22 are opposed to each other with a space therebetween, and the other ends of the pair of magnets 20 and 22 in the second orthogonal direction are opposed to each other with a space therebetween in a direction parallel to the first orthogonal direction.
  • Each of the pair of magnets 20 and 22 is plate-shaped with the rotation axis direction as the thickness direction.
  • Each of the pair of magnets 20 and 22 has a main surface on the side of the power generation elements 24 and 26 in the rotation axis direction and a main surface on the side opposite to the power generation elements 24 and 26 in the rotation axis direction.
  • the main surface on the power generation element side in the rotation axis direction of the magnet refers to the main surface facing the rotation axis direction of the magnet and facing toward the power generation element.
  • the main surface on the side opposite to the power generation element in the direction of the rotation axis of the magnet is the main surface facing the direction of the rotation axis of the magnet and facing away from the power generation element.
  • Each of the plurality of power generating elements 24 and 26 generates power by changing the magnetic field caused by the rotation of the pair of magnets 20 and 22 together with the rotating shaft 10 .
  • Each of the plurality of power generation elements 24 and 26 is arranged on the main surface of the substrate 18 facing away from the rotating plate 16 .
  • the plurality of power generation elements 24 and 26 overlap the substrate 18 when viewed from the rotation axis direction.
  • the plurality of power generation elements 24 and 26 are arranged at positions offset from the rotation axis A. That is, the plurality of power generation elements 24 and 26 do not overlap the rotation axis A when viewed from the rotation axis direction.
  • the plurality of power generation elements 24 and 26 are arranged with a phase difference in the rotation direction of the rotating shaft 10 . That is, the plurality of power generation elements 24 and 26 are arranged at mutually different positions in the rotation direction of the rotating shaft 10 .
  • the distance from the rotation axis A to each of the plurality of power generation elements 24 and 26 in the radial direction centered on the rotation axis A is It is approximately equal to the distance to the outer magnetic pole of each magnetic pole. That is, the distance from the rotation axis A to the power generation element 24 in the radial direction is approximately equal to the distance from the rotation axis A to the south pole of the magnet 20, and approximately equal to the distance from the rotation axis A to the north pole of the magnet 22. .
  • the distance from the rotation axis A to the power generating element 26 in the radial direction is approximately equal to the distance from the rotation axis A to the south pole of the magnet 20, and approximately equal to the distance from the rotation axis A to the north pole of the magnet 22. .
  • the power generating element 24 extends tangentially to the rotating direction of the rotating shaft 10 and is arranged on the main surface of the substrate 18 facing away from the rotating shaft 10 (opposite to the rotating plate 16).
  • the power generation element 24 has a magnetic sensing portion 30 and a coil 32 wound around the magnetic sensing portion 30 .
  • the magnetic sensing part 30 is a magnetic body extending in a tangential direction to the rotating direction of the rotating shaft 10 and is located on the main surface of the substrate 18 facing away from the rotating plate 16 .
  • the magneto-sensitive portion 30 is a magnetic material that produces a large Barkhausen effect, and is a Wiegand Wire extending along a tangential line in the rotating direction of the rotating shaft 10 .
  • a Wiegand wire is a magnetic material whose magnetization direction is aligned in one longitudinal direction when a magnetic field of a predetermined value or more is applied along the longitudinal direction of the Wiegand wire.
  • the magnetization direction of the Wiegand wire jumps and a voltage pulse is induced across the coil wound on the Wiegand wire.
  • the power generation element 24 generates power.
  • the power generation element 26 extends along a tangential line in the rotation direction of the rotating shaft 10 and is arranged on the main surface of the substrate 18 facing away from the rotating shaft 10 (opposite to the rotating plate 16).
  • the power generation element 26 has a magnetic sensing portion 34 and a coil 36 wound around the magnetic sensing portion 34 .
  • the magnetic sensing part 34 is a magnetic body extending along a tangential line in the rotating direction of the rotating shaft 10 and is located on the main surface of the substrate 18 facing away from the rotating plate 16 .
  • the magnetic field sensing portion 34 is a magnetic material that produces a large Barkhausen effect, and is a Wiegand wire extending tangentially to the rotational direction of the rotating shaft 10 .
  • Power generation element 26 generates power in the same manner as power generation element 24 .
  • the control circuit 28 is arranged on the main surface of the substrate 18 facing the rotating shaft 10 (rotating plate 16), and is electrically connected to the power generation element 24 and the like. For example, the control circuit 28 determines the rotational position of the rotary shaft 10 depending on which of the power generating elements 24 and 26 generates power. Further, for example, the rotation detector 14 may further include one or more magnetic sensors (not shown) that operate based on power from the plurality of power generation elements 24 and 26, and the control circuit 28 may include a plurality of The rotational position of the rotating shaft 10 may be determined based on which of the power generating elements 24 and 26 generated power and the detection result of the one or more magnetic sensors.
  • FIG. 4 to 6 are diagrams showing the relationship between the rotational positions of the pair of magnets 20 and 22 and the magnetic flux density distribution in the longitudinal direction of the power generating element 24.
  • FIG. 4 to 6 are diagrams showing the relationship between the rotational positions of the pair of magnets 20 and 22 and the magnetic flux density distribution in the longitudinal direction of the power generating element 24.
  • the magnetism sensing portion 30 of the power generation element 24 has a pair of magnets when viewed from the rotation axis direction. 20 and 22, and is positioned near one end of each of the pair of magnets 20 and 22 in the second orthogonal direction.
  • the magnetic field sensing portion 30 of the power generation element 24 is located at the position of the rotation axis 10 when viewed from the rotation axis direction. overlaps the central portion of the north pole of the magnet 22 in the direction of rotation of .
  • the power generation element 24 in a state between a state in which the first orthogonal direction is parallel to the longitudinal direction of the power generating element 24 and a state in which the second orthogonal direction is parallel to the longitudinal direction of the power generating element 24 , the power generation element 24 generates a power generation pulse.
  • the peak is positioned near the central portion in the longitudinal direction of the magnetic sensing portion 30 .
  • the magnetic flux density in the longitudinal direction of the magnetic field sensing portion 30 of the power generation element 24 can be distributed appropriately, so that the power generation element 24 can easily generate power.
  • the power generation element 26 can easily generate power as well as the power generation element 24 .
  • the rotation detector 14 according to the first embodiment has been described above.
  • the rotation detector 14 includes a pair of magnets 20 and 22 that rotate together with the rotating shaft 10, and a power generation element 24 that generates power by a change in the magnetic field caused by the rotation of the pair of magnets 20 and 22 together with the rotating shaft 10. and
  • the pair of magnets 20 and 22 are arranged with a space therebetween in a first orthogonal direction that sandwiches the rotation axis A of the rotation shaft 10 and is orthogonal to the rotation axis A.
  • the north pole and south pole of each of the pair of magnets 20 and 22 are arranged in the first orthogonal direction so that the north pole is located on one side in the first orthogonal direction.
  • the magnetic flux density in the longitudinal direction of the power generating element 24 can be easily distributed, so that the power generating element 24 can easily generate power.
  • each of the pair of magnets 20 and 22 is arranged along the rotation direction of the rotation shaft 10 .
  • the rotating shaft 10 can be easily provided between the pair of magnets 20 and 22 .
  • the pair of magnets 20 and 22 are arranged symmetrically with the rotation axis A interposed therebetween.
  • the magnetic flux density in the longitudinal direction of the power generation element 24 can be suppressed, so that the power generation element 24 can more easily generate power.
  • the power generation element 24 is arranged at a position shifted from the rotation axis A.
  • the magnetic flux density in the longitudinal direction of the power generation element 24 can be easily distributed appropriately, so that the power generation element 24 can easily generate power.
  • the rotation detector 14 includes a plurality of power generating elements 24 and 26.
  • FIG. 7 is a diagram showing a rotation detector according to the second embodiment. 7, illustration of the coil 32, the coil 36, and the like is omitted. The same applies to FIGS. 8 to 12 as well.
  • the rotation detector according to the second embodiment includes a pair of magnets 20a and 22a (a pair of magnets 20a and 22a) different from the pair of magnets 20 and 22. , is different from the rotation detector 14 .
  • Each of the pair of magnets 20a, 22a is mainly different from the pair of magnets 20, 22 in that each is a bar-shaped magnet extending in a direction orthogonal to the first orthogonal direction.
  • the north pole and south pole of each of the pair of magnets 20a and 22a are arranged in the first orthogonal direction such that the north pole is located on one side in the first orthogonal direction.
  • FIG. 8 is a diagram showing a rotation detector according to the third embodiment.
  • the rotation detector according to the third embodiment is arranged between one ends of the pair of magnets 20 and 22 in the second orthogonal direction and between the pair of magnets 20 and 22 in the second orthogonal direction.
  • the main difference from the rotation detector 14 is that it further includes a pair of magnetic bodies 38 and 40 arranged between the other ends of the detector.
  • the magnetic body 38 is arranged between one end portions of the pair of magnets 20 and 22 in the second orthogonal direction, and connects the one end portions.
  • the thickness of the magnetic body 38 in the rotation axis direction is equal to the thickness of the pair of magnets 20 and 22 .
  • the magnetic body 40 is arranged between the other ends of the pair of magnets 20 and 22 in the second orthogonal direction, and connects the other ends.
  • the thickness of the magnetic body 40 in the rotation axis direction is equal to the thickness of the pair of magnets 20 and 22 .
  • the rotation detector according to the present embodiment is arranged between one ends of the pair of magnets 20 and 22 in the second orthogonal direction orthogonal to the rotation axis A and orthogonal to the first orthogonal direction, and between one end of the pair of magnets 20 and 22 in the second orthogonal direction.
  • a pair of magnetic bodies 38 and 40 are arranged between the other ends of the magnets 20 and 22, respectively.
  • FIG. 9 is a diagram showing a rotation detector according to the fourth embodiment.
  • the rotation detector according to the fourth embodiment is mainly different from the rotation detector 14 in that a pair of magnets 20b and 22b different from the pair of magnets 20 and 22 is provided. ing.
  • each of the pair of magnets 20b and 22b in the first orthogonal direction on the side of the rotation axis A and the edge on the side opposite to the rotation axis A are curved in an elliptical arc when viewed from the direction of the rotation axis. ing. That is, the edge 42 of the magnet 20b on the rotation axis A side and the edge 44 on the side opposite to the rotation axis A in the first orthogonal direction are curved in an elliptical arc shape when viewed from the rotation axis direction.
  • An edge 46 on the side of the rotation axis A of the magnet 22b and an edge 48 on the side opposite to the rotation axis A in the first orthogonal direction are curved in an elliptical arc shape when viewed from the rotation axis direction.
  • the “edge on the rotation axis A side” refers to the edge of the magnet facing toward the rotation axis A.
  • the edge on the side opposite to the rotation axis A refers to the edge of the magnet facing in the opposite direction to the rotation axis A. As shown in FIG. These are the same for the following.
  • each of the pair of magnets 20b and 22b on the side of the rotation axis A is curved into an arc of an ellipse D centered on the rotation axis A, and each of the pair of magnets 20b and 22b
  • the edge on the side opposite to the rotation axis A is curved in the shape of an ellipse E with the rotation axis A as the center.
  • the ellipse related to the edge on the rotation axis A side of one magnet and the ellipse related to the edge on the rotation axis A side of the other magnet are different from each other. good too. Further, for example, the ellipse related to the edge of one of the magnets 20b and 22b opposite to the rotation axis A and the ellipse related to the edge of the other magnet opposite to the rotation axis A , may be different from each other.
  • each of the pair of magnets 20b and 22b on the side of the rotation axis A and the edge on the side opposite to the rotation axis A are curved outward in the radial direction about the rotation axis A.
  • the ellipticity of the ellipse D related to the edge on the rotation axis A side of each of the pair of magnets 20b and 22b is different from the ellipticity of the ellipse E related to the edge on the side opposite to the rotation axis A of the magnet.
  • ellipticity is represented by minor axis/major axis.
  • the ellipticity of the ellipse D related to the edge on the rotation axis A side of each of the pair of magnets 20b and 22b is the ellipse of the ellipse E related to the edge on the side opposite to the rotation axis A of the magnet. less than the rate.
  • the major axis of ellipse D is smaller than the major axis of ellipse E
  • the minor axis of ellipse D is smaller than the minor axis of ellipse E.
  • the major axis direction of the ellipse D related to the edge on the rotation axis A side of each of the pair of magnets 20b and 22b coincides with the major axis direction of the ellipse E related to the edge on the side opposite to the rotation axis A of the magnet.
  • Each of the longitudinal directions coincides with the second orthogonal direction.
  • the edge of each of the pair of magnets 20b and 22b on the side of the rotation axis A and the edge on the side opposite to the rotation axis A form an elliptical circle when viewed from the direction of the rotation axis. curved in an arc.
  • the ellipticity of the ellipse D related to the edge on the rotation axis A side of each of the pair of magnets 20b and 22b is different from the ellipticity of the ellipse E related to the edge on the side opposite to the rotation axis A of the magnet.
  • FIG. 10 is a diagram showing a rotation detector according to the fifth embodiment.
  • the rotation detector according to the fifth embodiment is mainly different from the rotation detector 14 in that a pair of magnets 20c and 22c different from the pair of magnets 20 and 22 is provided. ing.
  • Each of the pair of magnets 20c and 22c is arranged in the first position so that the edge of the magnet opposite to the rotation axis A is located closer to the power generation element 24 with respect to the edge of the magnet on the rotation axis A side. Tilted with respect to the orthogonal direction.
  • the magnet 20c is arranged in the first orthogonal direction so that the edge 50 of the magnet 20c opposite to the rotation axis A is positioned closer to the power generating element 24 than the edge 52 of the magnet 20c on the rotation axis A side. tilted against
  • the magnet 22c is arranged in the first orthogonal direction so that the edge 54 of the magnet 22c opposite to the rotation axis A is positioned closer to the power generating element 24 than the edge 56 of the magnet 22c on the rotation axis A side. tilted against
  • each of the pair of magnets 20c and 22c opposite to the power generation element 24 in the direction of the rotation axis is positioned with respect to the first orthogonal direction so that it is gradually positioned closer to the power generation element 24 as the distance from the rotation axis A increases.
  • the main surface 58 of the magnet 20c on the side opposite to the power generation element 24 in the rotation axis direction is inclined with respect to the first orthogonal direction so as to be positioned gradually closer to the power generation element 24 as the distance from the rotation axis A increases.
  • the main surface 60 of the magnet 22c opposite to the power generation element 24 in the rotation axis direction is inclined with respect to the first orthogonal direction so as to be positioned gradually closer to the power generation element 24 as the distance from the rotation axis A increases.
  • the power generation element 24 and the pair of magnets 20c and 22c are arranged at different positions in the rotation axis direction.
  • Each of the pair of magnets 20c and 22c is arranged so that the end of the magnet opposite to the rotation axis A is positioned closer to the power generation element 24 with respect to the end of the magnet on the rotation axis A side. Tilted with respect to the orthogonal direction.
  • the end on the rotation axis A side indicates the end of the magnet facing toward the rotation axis A.
  • the end opposite to the rotation axis A refers to the end of the magnet facing in the opposite direction to the rotation axis A. As shown in FIG. These are the same for the following.
  • the power generation element 24 and the pair of magnets 20c and 22c are arranged at different positions in the rotation axis direction.
  • the main surface of each of the pair of magnets 20c and 22c facing away from the power generation element 24 in the direction of the rotation axis is arranged to be gradually closer to the power generation element 24 in the direction of the rotation axis as the distance from the rotation axis A increases. Tilted with respect to the orthogonal direction.
  • FIG. 11 is a diagram showing a rotation detector according to the sixth embodiment.
  • the rotation detector according to the sixth embodiment is mainly different from the rotation detector 14 in that a pair of magnets 20d and 22d different from the pair of magnets 20 and 22 is provided. ing.
  • the pair of magnets 20d and 22d each have a semicircular arc shape along the rotation direction of the rotating shaft 10, and are formed integrally with each other to form an annular magnet. That is, the rotation detector according to the sixth embodiment has an annular magnet along the rotation direction of the rotating shaft 10 .
  • the semi-arc-shaped magnet 20d and the semi-arc-shaped magnet 22d may be separately formed, and then the magnets 20d and 22d may be integrally formed by joining them with a joining member or the like.
  • an annular magnet may be formed by magnetizing an annular member. In this case, one half of the ring-shaped magnet corresponds to the magnet 20d and the other half of the ring-shaped magnet corresponds to the magnet 22d.
  • the N pole of the magnet 20d is arranged continuously side by side with the S pole of the magnet 22d in the rotation direction of the rotating shaft 10, and the S pole of the magnet 20d is aligned with the N pole of the magnet 22d in the rotating direction of the rotating shaft 10. They are arranged consecutively alongside the poles.
  • the pair of magnets 20d and 22d each have a semicircular arc shape along the rotation direction of the rotating shaft 10, and are formed integrally with each other to form an annular magnet.
  • the positional relationship between the pair of magnets 20d and 22d can be easily fixed, so that the power generating element 24 can more easily generate power.
  • FIG. 12 is a diagram showing a rotation detector according to the seventh embodiment.
  • the rotation detector according to the seventh embodiment includes a pair of magnets 20e, 22e different from the pair of magnets 20, 22, and a plurality of magnetic bodies 62, 64, It is mainly different from rotation detector 14 in that 66 is further provided.
  • the pair of magnets 20e and 22e each have a semicircular arc shape along the direction of rotation, and are formed integrally with each other to form an annular magnet.
  • the north and south poles of one of the pair of magnets 20e and 22e are arranged in the direction of the rotation axis so that the north pole is positioned on one side in the direction of the rotation axis.
  • the other north pole and south pole of the pair of magnets 20e and 22e are aligned in the rotation axis direction so that the north pole is positioned on the other side in the rotation axis direction.
  • the north and south poles of the magnet 20e are arranged in the rotation axis direction so that the north pole is located in the direction opposite to the power generation element 24 in the rotation axis direction.
  • the N pole and S pole of the magnet 22e are aligned in the rotation axis direction such that the N pole is positioned in the direction of the power generation element 24 in the rotation axis direction.
  • the plurality of magnetic bodies 62, 64 are arranged at the edges on the rotation axis A side of the pair of magnets 20e, 22e, respectively.
  • the magnetic body 62 is arranged on the edge portion 68 of the magnet 20e on the rotation axis A side, and is arranged along the rotation direction of the rotation shaft 10.
  • the magnetic body 64 is arranged on the edge 70 of the magnet 22 e on the rotation axis A side, and is arranged along the rotation direction of the rotation shaft 10 .
  • the magnetic bodies 62 and 64 are separated from each other.
  • the magnetic body 66 is arranged on the main surface of the pair of magnets 20e and 22e on the side opposite to the power generating element 24. Specifically, the magnetic body 66 is arranged on the main surface 72 of the magnet 20e opposite to the power generating element 24 and the main surface 74 of the magnet 22e opposite to the power generating element 24. As shown in FIG. The magnetic body 66 is arranged along the rotation direction of the rotation shaft 10, and overlaps the pair of magnets 20e and 22e when viewed from the rotation axis direction.
  • the north and south poles of one of the pair of magnets 20e and 22e are aligned in the rotation axis direction so that the north pole is located on one side in the rotation axis direction.
  • the other north pole and south pole of the pair of magnets 20e and 22e are aligned in the rotation axis direction so that the north pole is positioned on the other side in the rotation axis direction.
  • It further includes a plurality of magnetic bodies 62 and 64 respectively arranged at the edges of the pair of magnets 20e and 22e in the first orthogonal direction on the rotation axis A side.
  • FIG. 13A is a diagram showing another example of the magnet
  • FIGS. 13B, 14A and 14B are diagrams showing still another example of the magnet.
  • magnets may be formed as shown in FIGS. 13A, 13B, 14A and 14B.
  • 13A, 13B, 14A, and 14B show only one of the pair of magnets, and the illustration of the other magnet is omitted.
  • the other magnet is formed symmetrically with the one magnet.
  • FIG. 13A is a diagram showing another example of a magnet.
  • the edge 102 of the magnet 100 on the side of the rotation axis A is curved into an ellipse G having a center point F different from the rotation axis A when viewed from the rotation axis direction.
  • the edge 104 of the magnet 100 on the side opposite to the rotation axis A may be curved in the shape of an ellipse H with the point F as the center when viewed from the rotation axis direction.
  • the ellipticity of the ellipse G associated with the edge 102 is equal to the ellipticity of the ellipse H associated with the edge 104 .
  • the major axis direction of the ellipse G related to the edge 102 is different from the major axis direction of the ellipse H related to the edge 104 .
  • the long axis direction of the ellipse G related to the edge 102 is orthogonal to the long axis direction of the ellipse H related to the edge 104 .
  • the long axis direction of the ellipse G related to the edge 102 does not have to be orthogonal to the long axis direction of the ellipse H related to the edge 104 .
  • the major axis direction of ellipse G associated with edge 102 is parallel to the second orthogonal direction, and the major axis direction of ellipse H associated with edge 104 coincides with the first orthogonal direction.
  • Ellipse G is the same size as ellipse H.
  • FIG. 13B is a diagram showing another example of a magnet.
  • the edge 108 of the magnet 106 on the rotation axis A side curves into an arc of an ellipse J centered at a point I different from the rotation axis A when viewed from the rotation axis direction.
  • the edge 110 of the magnet 106 on the side opposite to the rotation axis A may be curved in the shape of an ellipse K with the point I as the center when viewed from the rotation axis direction.
  • the ellipticity of the ellipse J associated with the edge 108 is different from the ellipticity of the ellipse K associated with the edge 110 .
  • the major axis direction of the ellipse J associated with the edge 108 is different from the major axis direction of the ellipse K associated with the edge 110 .
  • the long axis direction of the ellipse J related to the edge 108 is orthogonal to the long axis direction of the ellipse K related to the edge 110 .
  • the long axis direction of the ellipse J related to the edge 108 does not have to be orthogonal to the long axis direction of the ellipse K related to the edge 110 .
  • the major axis direction of ellipse J associated with edge 108 coincides with the first orthogonal direction
  • the major axis direction of ellipse K associated with edge 110 is parallel to the second orthogonal direction.
  • the major axis of ellipse J associated with edge 108 is smaller than the minor axis of ellipse K associated with edge 110 .
  • FIG. 14A is a diagram showing still another example of a magnet.
  • the edge 114 of the magnet 112 on the rotation axis A side curves into an arc of an ellipse M centered at a point L different from the rotation axis A when viewed from the rotation axis direction.
  • the edge 116 of the magnet 112 on the side opposite to the rotation axis A may be curved in an arc of an ellipse N with the point L as the center when viewed from the rotation axis direction.
  • the ellipticity of the ellipse M associated with the edge 114 is different from the ellipticity of the ellipse N associated with the edge 116 .
  • the major axis direction of the ellipse M associated with the edge 114 coincides with the major axis direction of the ellipse N associated with the edge 116 .
  • the major axis direction of ellipse M associated with edge 114 and the major axis direction of ellipse N associated with edge 116 are each aligned with the first orthogonal direction.
  • the major axis of the ellipse M associated with the edge 114 is smaller than the major axis of the ellipse N associated with the edge 116 and larger than the minor axis of the ellipse N.
  • the minor axis of ellipse M associated with edge 114 is smaller than the minor axis of ellipse N associated with edge 116 .
  • FIG. 14B is a diagram showing still another example of the magnet.
  • the edge 120 of the magnet 118 on the rotation axis A side curves into an arc of an ellipse P centered at a point O different from the rotation axis A when viewed from the rotation axis direction.
  • the edge 122 of the magnet 118 on the side opposite to the rotation axis A may be curved in the shape of an ellipse Q with the point O as the center when viewed from the rotation axis direction.
  • the ellipticity of the ellipse P associated with the edge 120 is different from the ellipticity of the ellipse Q associated with the edge 122 .
  • the long axis direction of the ellipse P related to the edge 120 coincides with the long axis direction of the ellipse Q related to the edge 122 .
  • the major axis direction of ellipse P associated with edge 120 and the major axis direction of ellipse Q associated with edge 122 are each parallel to the second orthogonal direction.
  • the major axis of the ellipse P associated with the edge 120 is smaller than the major axis of the ellipse Q associated with the edge 122 and larger than the minor axis of the ellipse Q.
  • the minor axis of ellipse P associated with edge 120 is smaller than the minor axis of ellipse Q associated with edge 122 .
  • the rotation detector 14 includes a plurality of power generation elements 24 and 26 has been described, but the present invention is not limited to this.
  • the rotation detector may have only one power generating element.
  • the present invention is not limited to this.
  • a plurality of power generating elements may be arranged on the main surface of the substrate facing the rotating plate.
  • the present invention is not limited to this.
  • a pair of magnets may be arranged on the major surface of the rotating plate facing the substrate.
  • the rotation detector according to the present disclosure can be used to detect rotation of a rotating shaft of a motor that rotates a load.
  • rotation detector 16 rotating plate 18 substrate 20, 20a, 20b, 20c, 20d, 20e, 22, 22a, 22b, 22c, 22d, 22e, 100, 106, 112, 118 magnets 24, 26 power generating element 28 control circuit 30 , 34 magneto-sensitive parts 32, 36 coils 38, 40, 62, 64, 66 magnetic bodies 42, 44, 46, 48, 50, 52, 54, 56, 68, 70, 102, 104, 108, 110, 114, 116, 120, 122 Edge 58, 60, 72, 74 Main surface

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PCT/JP2022/021057 2021-06-30 2022-05-23 回転検出器 Ceased WO2023276488A1 (ja)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024166621A1 (ja) * 2023-02-10 2024-08-15 パナソニックＩｐマネジメント株式会社 発電装置、回転角度検出器、及び発電装置の製造方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008203199A (ja) * 2007-02-22 2008-09-04 Nsk Ltd 回転角検出装置
US20150130450A1 (en) * 2012-04-30 2015-05-14 Fritz Kubler Gmbh Zahl- Und Sensortechnik Energy-self-sufficient multiturn rotary encoder and method for determining a unique position of an encoder shaft by means of the multiturn rotary encoder
JP2015114192A (ja) * 2013-12-11 2015-06-22 三菱電機株式会社 回転数検出器

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008203199A (ja) * 2007-02-22 2008-09-04 Nsk Ltd 回転角検出装置
US20150130450A1 (en) * 2012-04-30 2015-05-14 Fritz Kubler Gmbh Zahl- Und Sensortechnik Energy-self-sufficient multiturn rotary encoder and method for determining a unique position of an encoder shaft by means of the multiturn rotary encoder
JP2015114192A (ja) * 2013-12-11 2015-06-22 三菱電機株式会社 回転数検出器

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2024166621A1 (ja) * 2023-02-10 2024-08-15 パナソニックＩｐマネジメント株式会社 発電装置、回転角度検出器、及び発電装置の製造方法

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