WO2013118161A1 - Moteur électrique - Google Patents

Moteur électrique Download PDF

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Publication number
WO2013118161A1
WO2013118161A1 PCT/JP2012/000781 JP2012000781W WO2013118161A1 WO 2013118161 A1 WO2013118161 A1 WO 2013118161A1 JP 2012000781 W JP2012000781 W JP 2012000781W WO 2013118161 A1 WO2013118161 A1 WO 2013118161A1
Authority
WO
WIPO (PCT)
Prior art keywords
sensor
target
holding member
electric motor
elastic
Prior art date
Application number
PCT/JP2012/000781
Other languages
English (en)
Japanese (ja)
Inventor
弘文 土井
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2013557226A priority Critical patent/JP5627804B2/ja
Priority to PCT/JP2012/000781 priority patent/WO2013118161A1/fr
Publication of WO2013118161A1 publication Critical patent/WO2013118161A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K29/00—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices
    • H02K29/06—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices
    • H02K29/08—Motors or generators having non-mechanical commutating devices, e.g. discharge tubes or semiconductor devices with position sensing devices using magnetic effect devices, e.g. Hall-plates, magneto-resistors

Definitions

  • the present invention relates to a sensor holding member used in an electric motor including a sensor for controlling the rotational speed.
  • a general three-phase synchronous AC motor creates a magnetic pole in the rotor by a permanent magnet of the stator, and creates a magnetic pole in the stator teeth by a coil disposed between the stator teeth of the stator.
  • the energization direction of the three-phase coils arranged between the stator teeth is switched by a power distribution plate (bus bar), and is switched between the S pole and the N pole.
  • This motor has a structure that controls the rotational speed by reading the rotational position of the target that rotates integrally with the shaft by means of a sensor installed on the outer periphery of the shaft, and Hall sensors that detect the position by magnetic force change are widely used. .
  • a sensor holding member there is, for example, Patent Document 1.
  • a concave portion is formed in the sensor, and a flexible support piece that can be elastically bent is formed on a support ring fixed to the outer periphery of the shaft, and between the support ring and the flexible support piece. The sensor is pushed in, and the convex portion of the flexible support piece is engaged with the concave portion of the sensor in a snap-fit manner.
  • the target in a motor that rotates at high speed, the target must be firmly fixed, and it is difficult to use a magnet as the target. Therefore, by using a large sensor in which a bias magnet is integrated with the Hall sensor, a magnetic material such as iron can be used for the target. Since the bias magnet-integrated sensor is increased in size, strength is required for the fixing method.
  • the sensor 102 was fixed by pouring the filler 101 into the member 100.
  • the holding member 100 is attached to a substrate 104 on the outer periphery of a shaft (not shown), and one target 103 is attached to a shaft (not shown).
  • the holding member 100 must be formed in a box shape so that the filler 101 does not leak out, the holding member 100 is interposed between the target 103 and the sensor 102, and the distance between the target 103 and the sensor 102. There was also a problem that L was far away.
  • This invention has been made to solve the above-described problems, and aims to hold a sensor without using a filler.
  • the electric motor of the present invention has a target that rotates integrally with the shaft, a sensor that is held at a position facing the target, detects the rotational position of the target, and a plurality of elastically deformable elastic holding portions, and the elastic holding portion And a holding member that presses the outer surface of the sensor from a plurality of directions and holds the sensor by elastic force.
  • the filler can be eliminated by holding the sensor by the elastic force of the holding member, and the efficiency of assembly can be improved.
  • the target-facing surface of the sensor can be opened, and the distance between the sensor and the target can be shortened.
  • FIG. 3 is an enlarged external perspective view of the holding member according to the first embodiment.
  • the holding member of Embodiment 1 is shown
  • Fig.4 (a) is a top view
  • FIG.4 (b) is sectional drawing cut
  • FIG. 5A is a plan view
  • FIG. 5B is a cross-sectional view taken along the line BB, showing a state in which the holding member of Embodiment 1 holds the sensor.
  • FIG. 3 is an enlarged view of an elastic holding portion of the holding member according to the first embodiment.
  • FIG. 6 is an external perspective view showing a modification of the holding member according to the first embodiment.
  • 8 shows a holding member for an electric motor according to Embodiment 2 of the present invention, in which FIG. 8 (a) is a plan view and FIG. 8 (b) is a cross-sectional view taken along line CC.
  • 9A and 9B show a conventional sensor holding structure, in which FIG. 9A is a plan view and FIG. 9B is a cross-sectional view taken along the line DD.
  • FIG. 1 An electric motor 1 shown in FIG. 1 constitutes a three-phase AC synchronous motor that rotates at high speed, and mainly includes a cylindrical housing 2, a stator portion 3 fixed inside the housing 2, and a rotor that rotates a shaft 4. Part 5 and bus bar part (distribution part) 6 arranged on one end face side of stator part 3.
  • FIG. 2 the top view of the stator part 3 and the rotor part 5 seen from the bus-bar part 6 side is shown. However, the housing 2 and the coil 12 are not shown.
  • the rotor part 5 is configured by laminating electromagnetic steel plates, and has two protrusions protruding outward in the circumferential direction at intervals of 180 degrees, and the protrusions are shifted by 90 degrees in the axial direction of the shaft 4 ( Projections 5a, 5b).
  • the shaft 4 is rotatably supported by bearings 7 and 8 fixed to the housing 2.
  • the rotor part 5 is fixed to the shaft 4, and the rotational force generated in the rotor part 5 is externally output by rotating the shaft 4 integrally with the rotor part 5.
  • the electric motor 1 When the electric motor 1 is applied to an automobile turbocharger, an electric compressor, and the like, the shaft 4 is connected to a rotating shaft of a turbine (so-called impeller), and the electric motor 1 rotationally drives the turbine.
  • the stator unit 3 includes two stator cores 9 and 10 and a magnet 11 disposed between the stator cores 9 and 10.
  • Each of the stator cores 9 and 10 is configured by laminating electromagnetic steel plates in the axial direction of the shaft 4.
  • Each of the stator cores 9 and 10 is formed with a plurality of teeth 9a and 10a protruding from the outside toward the central shaft 4 side, and one U-shaped pair of teeth 9a and 10a overlapping in the axial direction of the shaft 4 is formed.
  • the coil 12 is attached.
  • each coil 12 attached to each tooth 9a, 10a penetrates the bus bar portion 6 and protrudes toward the inverter board 13 side, and the copper plate coil 14 (U phase, V phase, W phase) of the bus bar portion 6 It is connected to the.
  • the copper plate coil 14 is a conductive member molded on the bus bar portion 6.
  • the copper plate coil 14 is annularly arranged along the circumferential direction of the shaft 4 and has an end connected to the inverter board 13.
  • the inverter board 13 converts an external power source (not shown) into an alternating current, and sequentially switches the three phases of the copper plate coil 14 such as the U phase, the V phase, and the W phase based on the position signal input from the sensor 16. Current is passed through 14.
  • the inverter board 13 is attached to the inside of the cover housing 19 and covered with the cover 20.
  • the magnetic flux generated by the magnet 11 magnetized in the axial direction flows out from the teeth 10a of the stator core 10 arranged on the N-pole side of the magnet 11 to the protrusion 5b of the rotor portion 5, and advances through the rotor portion 5 in the axial direction. It becomes a field magnetic flux which comes out from the protrusion 5a on the pole side and flows into the teeth 9a of the stator core 9 arranged on the S pole side of the rotor part 5.
  • the magnetic field force of the magnet 11 acts on the rotor part 5, so that the protrusion 5 b of the rotor part 5 facing the N pole side of the magnet 11 is magnetized to the N pole, and the S pole of the magnet 11.
  • the projecting part 5a of the rotor part 5 facing the side is magnetized to the S pole.
  • a sensor 16 and a target 17 are used for rotation control of the rotor unit 5.
  • One end portion of the shaft 4 protrudes from one end face of the stator portion 3 to the inner circumferential space of the bus bar portion 6, and a target 17 is fixed to the protruding tip by a screw 18.
  • the target 17 is a magnetic material such as iron.
  • the other sensor 16 is a Hall sensor with a built-in bias magnet, and is held by a holding member 15 formed at a position facing the target 17 in the inner space of the bus bar portion 6.
  • the magnetic field generated by the bias magnet changes according to the displacement of the target 17 as the shaft 4 rotates, and the Hall sensor detects the change in the magnetic field and outputs a position signal indicating the rotational position of the shaft 4.
  • FIG. 3 is an enlarged external perspective view of the holding member 15, FIG. 4A is a plan view, and FIG. 4B is a cross-sectional view taken along the line AA.
  • 5A is a plan view showing a state in which the holding member 15 holds the sensor 16
  • FIG. 5B is a cross-sectional view taken along the line BB.
  • the rectangular parallelepiped sensor 16 has a target facing surface 16 a facing the target 17 and a terminal 16 b for electrical connection to the inverter board 13.
  • the holding member 15 is formed of a resin material, and elastic holding portions 21 to 23 that generate an elastic force for holding the sensor 16 and contact portions 24 to 27 that contact the sensor 16 protrude from the bottom surface. ing.
  • a terminal hole 28 through which the terminal 16b passes is formed on the bottom surface.
  • the upper surface of the holding member 15 is open, and the sensor 16 is inserted from the open end while the elastic holding portions 21 to 23 are elastically deformed and expanded. Note that the elastic holding portions 21 to 23 project in three directions excluding the direction facing the target 17 so as not to cover the target facing surface 16a of the sensor 16.
  • FIG. 6 shows an enlarged view of the elastic holding portion 21.
  • a claw 21a is formed at the tip of the elastic holding part 21, and a tapered surface 21b is formed at the lower part of the claw 21a.
  • the axial component force F1 that presses the sensor 16 toward the bottom surface side and the lateral component force that moves the sensor 16 toward the center side. F2 can be obtained simultaneously.
  • the sensor 16 that has received the lateral component force F ⁇ b> 2 from the claw 21 a of the elastic holding portion 21 is pressed against the abutting portions 26 and 27 that are provided on the opposite side of the elastic holding portion 21, and the elastic holding portion 21. And the abutting portions 26 and 27. Further, since the axial component force F ⁇ b> 1 is received from the tapered surface 21 b, the sensor 16 does not come out to the open top end of the holding member 15.
  • the elastic holding portions 22 and 23 form claws and a tapered surface to simultaneously generate the axial component force F1 and the lateral component force F2.
  • the sensor 16 is sandwiched between the elastic holding part 22 and the opposing contact parts 24 and 27, and the sensor 16 is sandwiched between the elastic holding part 23 and the opposing contact parts 24 and 25.
  • the senor 16 can be securely held by the elastic force of the elastic holding portions 21 to 23. Further, the sensor 16 is applied to each tapered surface to absorb the dimensional variation of the sensor 16, and the position is held by pressing.
  • the elastic holding portions 21 to 23 on the holding member 15 and holding the sensor 16 by its elasticity, it is not necessary to use a filler as in the prior art described above. Therefore, it is not necessary to form the holding member 15 in a box shape so that the filler does not leak out. Accordingly, the target facing surface 16a of the sensor 16 can be opened by opening the target facing surface of the holding member 15, and the distance between the sensor 16 and the target 17 can be shortened.
  • the contact parts 24 and 27 are required so that the sensor 16 may not fall out from the target facing surface opening of the holding member 15, the contact parts 25 and 26 may be omitted.
  • the holding member 15 by forming the holding member 15 with a resin material, it can be formed integrally with the bus bar portion 6 made of the same resin material. Since the sensor 16 can be held without adding the holding member 15, the assemblability is improved. 1 and 3, the holding member 15 has a shape protruding from the inner peripheral surface of the bus bar portion 6, but is not limited thereto.
  • a recess 6a may be formed on the inner peripheral surface of the bus bar portion 6 as shown in FIG. 7, and the holding member 15 may be formed so as to be accommodated in the recess 6a, or a part of the holding member 15 may be accommodated in the recess 6a. You may form so that the remaining part may protrude.
  • the holding member 15 may be formed alone. In this case, for example, as shown in FIG. 4 and FIG. 5, an adhesive portion 29 having a shape protruding outward from the bottom surface of the holding member 15 is formed, and an adhesive is applied.
  • the holding member 15 is bonded and fixed to ().
  • a board dedicated to the sensor 16 is added during this period.
  • the holding member 15 may be attached to the substrate. Thereby, the terminal 16b can be shortened and the vibration resistance can be improved.
  • the holding member 15 is not limited to the bus bar portion 6 and the inverter board 13 (or the board dedicated to the sensor 16), but may be attached to the housing 2 or the like.
  • the electric motor 1 includes the target 17 that rotates integrally with the shaft 4, the sensor 16 that is held at a position facing the target 17 and detects the rotational position of the target 17, and elastic deformation.
  • a plurality of possible elastic holding portions 21 to 23, and the elastic holding portions 21 to 23 press the outer surface of the sensor 16 from a plurality of directions, and the holding member 15 holds the sensor 16 by elastic force. Configured. For this reason, it becomes possible to abolish the filler by holding the sensor 16 by the elastic force of the holding member 15, and the assembly efficiency can be improved.
  • the elastic holding portions 21 to 23 are formed on the surface excluding the target facing surface 16a of the sensor 16, and the holding member 15 is thus formed.
  • the target-facing surface can be configured to open. Thereby, the distance between a sensor and a target can be shortened.
  • each of the elastic holding portions 21 to 23 is configured to have a tapered surface at a portion that presses the outer surface of the sensor 16. For this reason, the sensor 16 can be fixed by causing the component force F1 in the axial direction that presses the sensor 16 to the bottom side and the component force F2 in the lateral direction that moves the sensor 16 toward the center simultaneously.
  • the holding member 15 is made of a resin material, and this holding member 15 is opposed to the target 17 on the inner peripheral side of the bus bar portion 6 also made of the resin material. It comprised so that it might comprise integrally in a position. For this reason, it is not necessary to install the holding member 15 when assembling the electric motor 1, and the assemblability is improved.
  • the holding member 15 may be configured to be attached to the inverter board 13 or a board dedicated to the bus bar portion 6, and in this case, the terminal 16 b of the sensor 16 can be shortened, so that vibration resistance can be improved. is there.
  • FIG. FIG. 8A is a plan view of the holding member 15 extracted from the electric motor 1 according to Embodiment 2
  • FIG. 8B is a cross-sectional view cut along the CC line.
  • the holding member 15 is formed of a resin material in the first embodiment
  • a part of the holding member 15 is formed of a metal plate in the second embodiment. 8 that are the same as or equivalent to those in FIGS. 1 to 7 are given the same reference numerals, and descriptions thereof are omitted.
  • the elastic holding portions 21 to 23 are made of a metal plate.
  • the elastic holding portions 21 to 23 of the metal plate can hold the sensor 16 with the elastic force generated in the metal plate even when the elastic holding portions 21 to 23 of the resin material exceed the allowable stress of the resin in size.
  • the elastic holding portions 21 to 23 of the metal plate are integrated with the resin material 30 by insert molding, or integrated with screws or screws for electrical insulation.
  • the metal plate elastic holding portions 21 to 23 may be directly screwed or screwed to the inverter board 13 (or the board dedicated to the sensor 16), or the metal plate elastic holding portions 21 to 23 may be connected to the bus bar portion 6. And may be integrally molded.
  • resin parts or metal plate contact portions 24 and 27 are formed so that the sensor 16 does not fall out of the target-facing surface opening of the holding member 15.
  • the contact portions 25 and 26 may be formed in the same manner as in the first embodiment.
  • the elastic holding portions 21 to 23 are made of metal plates, a large-sized sensor 16 can be held and the versatility of the holding member 15 is improved.
  • the holding member 15 has been described by taking the rectangular parallelepiped sensor 16 as an example, but it goes without saying that the sensor 16 having a shape other than the rectangular parallelepiped can be held.
  • the sensor 16 having a shape other than the rectangular parallelepiped can be held.
  • the taper surfaces of the elastic holding portions 21 to 23 can be applied to the outer surface of the sensor 16 and held by elastic force.
  • the Hall sensor which incorporated the bias magnet was mentioned as an example as the sensor 16, a Hall sensor single-piece
  • the electric motor according to the present invention presses the outer surface of the sensor from a plurality of directions with a plurality of elastic holding portions and holds the sensor by elastic force. Suitable for use.

Abstract

Selon l'invention, un élément de support (15) comprend des sections de support élastiques (21 à 23) dans trois directions à l'exception de celle où est disposée une surface (16a) d'un capteur (16) orientée vers une cible. Les surfaces extérieures du capteur (16) sont poussées par les sections de support élastiques (21 à 23) de telle façon que le capteur est retenu par une force élastique.
PCT/JP2012/000781 2012-02-06 2012-02-06 Moteur électrique WO2013118161A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2013557226A JP5627804B2 (ja) 2012-02-06 2012-02-06 電動機
PCT/JP2012/000781 WO2013118161A1 (fr) 2012-02-06 2012-02-06 Moteur électrique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2012/000781 WO2013118161A1 (fr) 2012-02-06 2012-02-06 Moteur électrique

Publications (1)

Publication Number Publication Date
WO2013118161A1 true WO2013118161A1 (fr) 2013-08-15

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ID=48946985

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2012/000781 WO2013118161A1 (fr) 2012-02-06 2012-02-06 Moteur électrique

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Country Link
JP (1) JP5627804B2 (fr)
WO (1) WO2013118161A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10998799B2 (en) 2015-11-18 2021-05-04 ZF Automotive UK Limited Position sensor assembly

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02119554A (ja) * 1988-10-27 1990-05-07 Mitsubishi Electric Corp モータの検知装置
JPH07280589A (ja) * 1994-04-08 1995-10-27 Sankyo Seiki Mfg Co Ltd 回転検出装置
JP2002257585A (ja) * 2001-03-06 2002-09-11 Asmo Co Ltd モータアクチュエータ

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02119554A (ja) * 1988-10-27 1990-05-07 Mitsubishi Electric Corp モータの検知装置
JPH07280589A (ja) * 1994-04-08 1995-10-27 Sankyo Seiki Mfg Co Ltd 回転検出装置
JP2002257585A (ja) * 2001-03-06 2002-09-11 Asmo Co Ltd モータアクチュエータ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10998799B2 (en) 2015-11-18 2021-05-04 ZF Automotive UK Limited Position sensor assembly

Also Published As

Publication number Publication date
JPWO2013118161A1 (ja) 2015-05-11
JP5627804B2 (ja) 2014-11-19

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