WO2021131199A1 - Moteur - Google Patents

Moteur Download PDF

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Publication number
WO2021131199A1
WO2021131199A1 PCT/JP2020/036596 JP2020036596W WO2021131199A1 WO 2021131199 A1 WO2021131199 A1 WO 2021131199A1 JP 2020036596 W JP2020036596 W JP 2020036596W WO 2021131199 A1 WO2021131199 A1 WO 2021131199A1
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WO
WIPO (PCT)
Prior art keywords
stator core
shielding member
axial direction
stator
coil
Prior art date
Application number
PCT/JP2020/036596
Other languages
English (en)
Japanese (ja)
Inventor
孝浩 深澤
Original Assignee
株式会社デンソー
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 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2021131199A1 publication Critical patent/WO2021131199A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/01—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for shielding from electromagnetic fields, i.e. structural association with shields
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports

Definitions

  • This disclosure relates to motors.
  • Patent Document 1 discloses an electric motor in which a rotor rotates when a stator generates a rotating magnetic field.
  • a shielding member formed of a non-magnetic material such as copper or aluminum is attached to the stator core of the stator. This makes it possible to shield the electromagnetic field from the stator with a shielding member.
  • the purpose of the present disclosure is to obtain a motor capable of improving the shielding effect of a low frequency magnetic field.
  • the motor of the first aspect of the present disclosure includes a stator having a stator core formed of a magnetic material, a coil formed by using a conductive winding and supported by the stator core, and the coil is energized.
  • a rotor that rotates as a result, a facing portion that is formed by using a magnetic material and is arranged so as to face a part of the coil in the axial direction at least on one side in the axial direction with respect to the stator, and the facing portion. It includes a stator core engaging portion that is connected and arranged in contact with or close to the stator core, and a shielding member that forms a magnetic path between the stator core and the stator core.
  • FIG. 1 is a cross-sectional view showing a cross section of the fan motor according to the first embodiment cut along the axial direction.
  • FIG. 2 is a cross-sectional view schematically showing the stator and the like of the fan motor according to the first embodiment.
  • FIG. 3 is a graph showing the change in the magnetic flux density per rotation of the fan motor according to the first embodiment, and shows the change in the magnetic flux density observed at a predetermined position on the inner peripheral surface of the rotor magnet.
  • FIG. 4 is a graph showing the result of FFT analysis of the change in magnetic flux density shown in FIG. FIG.
  • FIG. 5 is a graph showing the change in the magnetic flux density per rotation of the fan motor according to the comparative example, and shows the change in the magnetic flux density observed at a predetermined position on the inner peripheral surface of the rotor magnet.
  • FIG. 6 is a graph showing the result of FFT analysis of the change in magnetic flux density shown in FIG.
  • FIG. 7 is a cross-sectional view showing a cross section of the fan motor according to the second embodiment cut along the axial direction.
  • FIG. 8 is a cross-sectional view schematically showing a stator and the like of the fan motor according to the second embodiment.
  • the fan motor 10 as the motor of the present embodiment is a brushless motor having 10 poles and 30 slots used for rotating a fan forming a part of a vehicle air conditioner.
  • the fan motor 10 includes a motor main body 14 that rotates the rotating shaft 12, a control unit 16 having a drive circuit that controls rotation of the rotating shaft 12 by controlling energization of the motor main body 14, and the motor main body 14 and control. It includes a center piece 18 that supports the portion 16.
  • the arrow Z direction, the arrow R direction, and the arrow C direction which are appropriately shown in the drawing, indicate one side of the rotation shaft 12 in the rotation axis direction, the outside in the rotation radial direction, and one side in the rotation circumference direction, respectively.
  • the rotational axis direction, the rotational radial direction, and the rotational circumferential direction of the rotating shaft 12 are indicated unless otherwise specified.
  • the motor body 14 is composed of a rotating shaft 12, a rotor 20, a stator 22, and a shielding member 24 as main elements.
  • the rotating shaft 12 is formed by using a columnar steel material.
  • the rotating shaft 12 is rotatably supported by a pair of bearings 26 fixed to the center piece 18.
  • the rotor 20 is configured by fixing a rotor magnet 30 to a rotor housing 28 formed in a bottomed cylindrical shape with the other side open in the axial direction.
  • the rotor housing 28 includes a disc-shaped bottom wall 28A and a cylindrical peripheral wall 28B that bends and extends from the radially outer end of the bottom wall 28A to the other side in the axial direction.
  • An insertion portion 28C into which the rotation shaft 12 is inserted is provided at the center of the bottom wall 28A. By press-fitting the rotary shaft 12 into the insertion portion 28C, the rotor housing 28 and the rotary shaft 12 are integrally rotatably coupled to each other.
  • a single rotor magnet 30 in which N poles and S poles are alternately arranged in the circumferential direction can be used, or the rotor magnets 30 are arranged at intervals in the circumferential direction. It is also possible to use a plurality of rotor magnets 30 (segment magnets). In this embodiment, the sum of the number of N poles and the number of S poles is 10.
  • the rotor magnet 30 is fixed to the radial inner surface of the peripheral wall 28B of the rotor housing 28 via an adhesive or the like. Further, the rotor magnet 30 is arranged so as to face the stator 22 in the radial direction in a state where the axial center of the rotor magnet 30 and the axial center of the radially outer portion 32A of the stator core 32 coincide with each other. There is.
  • the stator 22 is configured to include an annular stator core 32 and an annular coil body 34 fixed to a radially outer portion 32A of the stator core 32.
  • a plurality of core sheets 36 formed in a predetermined shape using a plate material of iron or steel which is a magnetic material are laminated in the axial direction and integrated. It is formed by things and so on.
  • the plurality of core sheets 36 are integrated by fitting a part of the core sheets 36 in an uneven manner with each other.
  • a portion of the plurality of core sheets 36 that is unevenly fitted to each other is referred to as an unevenly fitted conductive portion 38. Then, the conduction state between the plurality of core sheets 36 is ensured through the uneven fitting conductive portion 38 and the like.
  • the axial thickness dimension of the radially outer portion 32A of the stator core 32 is thicker than the axial thickness dimension of the radial center portion 32B of the stator core 32.
  • 32C is formed. It should be noted that the configuration may be such that the step portion 32C is not formed.
  • stator core support portion 18A formed in the center piece 18 is inserted into the support hole 32D of the stator core 32, so that the stator core 32 (stator 22) is positioned in the circumferential direction with respect to the center piece 18. Further, the stator core 32 (stator 22) is fixed to the stator core support portion 18A by press fitting or the like.
  • the coil body 34 as a coil is formed by bending and bending a plurality of conducting wires 40 as windings so as to cover the radially outer portion 32A of the stator core 32.
  • the coil body 34 is formed by so-called wave winding of three conducting wires 40 constituting each of the U phase, the V phase, and the W phase. Further, the three conductors 40 are connected to the control unit 16. As a result, the energization of the coil body 34 (three conductors 40) is controlled by the control unit 16.
  • the portion arranged along the radial outer surface 32A0 in the radial outer portion 32A of the stator core 32 is referred to as the conductor portion 34A. ..
  • the conducting wire portion 34A is configured by arranging a part of the conducting wires 40 extending in the axial direction in the circumferential direction, and the U-phase conducting wire portion 34A, the V-phase conducting wire portion 34A, and the W-phase conducting wire portion 34A are formed. They are arranged in this order along the circumferential direction. Further, in the present embodiment, the number of the conducting wire portions 34A is 30.
  • the portion arranged along the axially one side surface 32A1 of the radially outer portion 32A of the stator core 32 is the first coil end 34B. Called. Further, in the three conducting wires 40 constituting the U phase, the V phase, and the W phase, the portion arranged along the surface 32A2 on the other side in the axial direction in the radial outer portion 32A of the stator core 32 is the second coil end 34C. Called.
  • the configuration in which the coil body 34 is formed by so-called wave winding along the outer peripheral surface of the radial outer portion 32A of the stator core 32 has been described, but other configurations may be used.
  • the stator core has a configuration having a plurality of teeth arranged at intervals in the circumferential direction, and a coil is formed around the teeth by winding a conducting wire around the teeth by distributed winding or concentrated winding. May be.
  • the shielding member 24 is formed by press working into a predetermined shape using a plate material of iron or steel which is a magnetic material.
  • the two shielding members 24 are attached to one side in the axial direction and the other side in the axial direction of the stator core 32, respectively.
  • the shielding member 24 attached to one side of the stator core 32 in the axial direction is referred to as a first shielding member 42
  • the shielding member 24 attached to the other side of the stator core 32 in the axial direction is referred to as a second shielding member 44.
  • the first shielding member 42 has a first facing portion 42A as a disc-shaped facing portion extending in the radial direction with the axial direction as the thickness direction, and the other axial direction from the radial inner end of the first facing portion 42A. It includes a first inner peripheral wall portion 42B as a stator core engaging portion formed in a cylindrical shape that bends and extends to the side. Then, the stator core 32 is located at a position where the radial outer surface of the first inner peripheral wall portion 42B on the other side in the axial direction 42C and the other end in the axial direction correspond to the stepped portion 32C on one side in the axial direction of the stator core 32.
  • the first shielding member 42 is attached to the stator core 32 in a state of being in contact with the radial inner surface of the radial outer portion 32A and the axially one side surface of the central portion 32B. Further, in a state where the first shielding member 42 is attached to the stator core 32, a magnetic path between the first shielding member 42 and the stator core 32 is secured. The first shielding member 42 and the stator core 32 may be separated from each other to such an extent that a magnetic path between them can be secured. Further, in a state where the first shielding member 42 is attached to the stator core 32, the first facing portion 42A is arranged so as to face and be close to the first coil end 34B of the coil body 34 in the axial direction. In the schematic diagram shown in FIG. 2, the central portion 32B of the stator core 32 is not shown.
  • the second shielding member 44 is formed in the same shape as the first shielding member 42. That is, the second shielding member 44 has a second facing portion 44A as a disc-shaped facing portion extending in the radial direction with the axial direction as the thickness direction, and a shaft from the radial inner end of the second facing portion 44A. It includes a second inner peripheral wall portion 44B as a stator core engaging portion formed in a cylindrical shape that bends and extends to one side in the direction. In the present embodiment, the outer diameter of the second facing portion 44A is set to be smaller than the outer diameter of the first facing portion 42A of the first shielding member 42.
  • the stator core 32 is located at a position where the radial outer surface and the end on the other side in the axial direction of the end portion 44C on one side in the axial direction of the second inner peripheral wall portion 44B correspond to the stepped portion 32C on the other side in the axial direction in the stator core 32.
  • the second shielding member 44 is attached to the stator core 32 in a state of being in contact with the radial inner surface of the radial outer portion 32A and the axially opposite surface of the central portion 32B. Further, in a state where the second shielding member 44 is attached to the stator core 32, a magnetic path between the second shielding member 44 and the stator core 32 is secured.
  • the second shielding member 44 and the stator core 32 may be separated from each other to such an extent that a magnetic path between them can be secured. Further, in a state where the second shielding member 44 is attached to the stator core 32, the second facing portion 44A is arranged so as to face and be close to the second coil end 34C of the coil body 34 in the axial direction.
  • the conduction state between the first shielding member 42 and the second shielding member 44 and the ground potential side 16A of the drive circuit of the control unit 16 is secured via the wiring 46 or the like.
  • the coil body 34 when the energization of the stator 22 to the coil body 34 is controlled by the control unit 16, the coil body 34 generates a magnetic flux (magnetic field). As a result, the rotor 20 rotates together with the rotating shaft 12.
  • the first shielding member 42 and the second shielding member 44 having the above-described configuration are provided. Therefore, a part of the magnetic flux generated by the first coil end 34B in the coil body 34 is introduced into the first facing portion 42A of the first shielding member 42. Further, the magnetic flux introduced into the first facing portion 42A is introduced into the stator core 32 through the first inner peripheral wall portion 42B.
  • the closed circuit C1 for the magnetic flux generated by the first coil end 34B can be formed between the first shielding member 42 and the stator core 32, and the second coil end 34C is generated.
  • a closed circuit C1 for magnetic flux can be formed between the second shielding member 44 and the stator core 32.
  • the magnetic flux leakage of the low frequency magnetic field can be effectively suppressed by configuring the shielding member 24 of the magnetic material (magnetic material) as a magnetic path to induce the magnetic flux as described above. ..
  • the closed magnetic circuit C1 is schematically shown by a solid line.
  • the arrows A1 and A2 shown in FIG. 1 indicate the direction of the current in the coil body 34.
  • the circumference of the stator 22 is configured to guide the magnetic flux from the first coil end 34B and the second coil end 34C of the coil body 34 to the first shielding member 42 and the second shielding member 44. Fluctuations in changes in magnetic flux density due to the number of slots (the number of conductors 34A) that occur in the direction can be suppressed. As a result, it is possible to suppress the fluctuation of the change in the magnetic flux density from becoming a magnetic excitation force, and to prevent the noise level of the fan motor 10 from deteriorating.
  • FIG. 3 shows a change in the magnetic flux density per rotation (360 deg) of the fan motor 10 of the present embodiment (change in the magnetic flux density observed at a predetermined position on the inner peripheral surface of the rotor magnet 30).
  • FIG. 4 shows a graph showing the result of FFT analysis of the change in magnetic flux density shown in FIG.
  • FIG. 5 shows one rotation of the fan motor according to the comparative example configured in the same manner as the fan motor 10 of the present embodiment except that the first shielding member 42 and the second shielding member 44 are not provided.
  • a graph showing the change in magnetic flux density per 360 deg) (change in magnetic flux density observed at a predetermined position on the inner peripheral surface of the rotor magnet 30) is shown
  • FIG. 6 shows the magnetic flux shown in FIG.
  • the fan motor 10 of the present embodiment can prevent (or suppress) fluctuations in the change in magnetic flux density as compared with the fan motor according to the comparative example. It is possible to suppress an increase in the fluctuation range W of the density). More specifically, as shown in FIGS. 4 and 6, the fan motor 10 of the present embodiment has a magnetic flux density of 5 (fifth order) with respect to the rotation of the rotor 20 as compared with the fan motor according to the comparative example. Fluctuations in change can be prevented (or suppressed).
  • the first shielding member 42 and the second shielding member 44 can function as iron cores having the same functions as the stator core 32, whereby the coil body 34 The inductance can be improved. As a result, switching noise associated with switching of energization in the coil body 34 can be reduced.
  • the conduction state between the first shielding member 42 and the second shielding member 44 and the ground potential side 16A of the drive circuit of the control unit 16 is secured via the wiring 46 or the like. That is, the potentials of the first shielding member 42 and the second shielding member 44 are the same potential as the ground potential side 16A of the drive circuit of the control unit 16. As a result, the electric field can be concentrated between the coil body 34 and the first shielding member 42 and the second shielding member 44, and the field emission to the outside of the fan motor 10 can be suppressed.
  • FIG. 2 the surfaces of the first shielding member 42, the second shielding member 44, and the stator core 32 that receive the electric field from the coil body 34 are shown by broken lines S.
  • the two components of the first shielding member 42 and the second shielding member 44 are attached to the stator core 32, but the present disclosure is not limited to this.
  • the shielding member 48 which is a single component, may be attached to the stator core 32.
  • the portions corresponding to the first shielding member 42 and the second shielding member 44 are designated by the same reference numerals as the portions corresponding to the first shielding member 42 and the second shielding member 44.
  • the radially outer end of the first facing portion 42A and the radially outer end of the second facing portion 44A are bent toward the rotor magnet 30 side.
  • the configuration of this embodiment can be applied to a configuration in which the rotor is arranged inside the stator core 32 in the radial direction.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Motor Or Generator Frames (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

Moteur (10) de ventilateur pourvu d'un stator (22) comportant : un noyau de stator (32) formé à l'aide d'un matériau magnétique ; et un corps de bobine (34) formé à l'aide d'un enroulement conducteur et supporté sur le noyau de stator (32). Le moteur (10) de ventilateur est en outre pourvu : d'un rotor (20) qui tourne sous l'effet de l'excitation du corps de bobine (34) ; et d'un élément de blindage (24) qui est formé à l'aide d'un matériau magnétique et par lequel un trajet magnétique est formé entre le noyau de stator (32) et l'élément de blindage (24). L'élément de blindage (24) comporte : une première partie en regard (42A) et une seconde partie de face (44A) qui sont disposées en regard d'une partie du corps de bobine (34) dans la direction axiale au moins sur un côté dans la direction axiale par rapport au stator (22) ; et une première partie de paroi périphérique intérieure (42B) et une seconde partie de paroi périphérique intérieure (44B) qui sont reliées à la première partie en regard (42A) et à la seconde partie en regard (44A) et sont disposées dans un état d'établissement de contact avec le noyau de stator (32) ou à proximité de celui-ci.
PCT/JP2020/036596 2019-12-23 2020-09-28 Moteur WO2021131199A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019231444A JP2021100344A (ja) 2019-12-23 2019-12-23 モータ
JP2019-231444 2019-12-23

Publications (1)

Publication Number Publication Date
WO2021131199A1 true WO2021131199A1 (fr) 2021-07-01

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PCT/JP2020/036596 WO2021131199A1 (fr) 2019-12-23 2020-09-28 Moteur

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JP (1) JP2021100344A (fr)
WO (1) WO2021131199A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63138870U (fr) * 1987-03-05 1988-09-13
JP2004072869A (ja) * 2002-08-05 2004-03-04 Nippon Densan Corp スピンドルモータ及びこれを備えたハードディスクドライブ装置
JP2011030356A (ja) * 2009-07-24 2011-02-10 Nissan Motor Co Ltd アキシャルギャップ型モータ
JP2018068101A (ja) * 2016-09-18 2018-04-26 ジョンソン エレクトリック ソシエテ アノニム 電気モータ及びそのアーマチャ
JP2018191444A (ja) * 2017-05-08 2018-11-29 ミネベアミツミ株式会社 ステータ構造およびレゾルバ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63138870U (fr) * 1987-03-05 1988-09-13
JP2004072869A (ja) * 2002-08-05 2004-03-04 Nippon Densan Corp スピンドルモータ及びこれを備えたハードディスクドライブ装置
JP2011030356A (ja) * 2009-07-24 2011-02-10 Nissan Motor Co Ltd アキシャルギャップ型モータ
JP2018068101A (ja) * 2016-09-18 2018-04-26 ジョンソン エレクトリック ソシエテ アノニム 電気モータ及びそのアーマチャ
JP2018191444A (ja) * 2017-05-08 2018-11-29 ミネベアミツミ株式会社 ステータ構造およびレゾルバ

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