WO2019044612A1 - Electric motor - Google Patents

Electric motor Download PDF

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Publication number
WO2019044612A1
WO2019044612A1 PCT/JP2018/030954 JP2018030954W WO2019044612A1 WO 2019044612 A1 WO2019044612 A1 WO 2019044612A1 JP 2018030954 W JP2018030954 W JP 2018030954W WO 2019044612 A1 WO2019044612 A1 WO 2019044612A1
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WO
WIPO (PCT)
Prior art keywords
stator
peripheral surface
motor housing
electric motor
outer peripheral
Prior art date
Application number
PCT/JP2018/030954
Other languages
French (fr)
Japanese (ja)
Inventor
岡本　敦志
俊弘 竹荒
篤 勝田
Original Assignee
株式会社ミツバ
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 株式会社ミツバ filed Critical 株式会社ミツバ
Publication of WO2019044612A1 publication Critical patent/WO2019044612A1/en

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/18—Means for mounting or fastening magnetic stationary parts on to, or to, the stator structures

Definitions

  • the present invention relates to an electric motor.
  • a general brushless motor has a stator fixed to a motor housing and a rotor rotatably provided radially inward of the stator.
  • the stator has a cylindrical core body fixed to the motor housing, and a plurality of teeth protruding radially inward from the inner peripheral surface of the core body. Slots opened radially inward are respectively formed between the teeth. A winding is wound on each tooth through this slot.
  • the stator in order to facilitate the winding operation of the winding to each tooth and to improve the space factor of the winding, the stator is formed by a plurality of divided cores which are divided in the circumferential direction.
  • the stator is formed by arranging and arranging a plurality of divided cores in the circumferential direction (see, for example, Patent Document 1).
  • the divided cores adjacent to each other are integrally connected by welding, fitting, or the like.
  • the stator which consists of a plurality of division cores into the motor housing
  • a compression stress may occur between the division cores adjacent to each other with the motor housing.
  • the electromagnetic steel sheet constituting the stator has a characteristic that when a compressive stress is generated, the magnetic flux hardly flows in that portion. For this reason, in the circumferential direction of the stator, portions with low magnetic flux density are generated at a plurality of places due to the compressive stress generated at the connection portion between the divided cores. If the compressive stress generated at the connection portion between the split cores is unevenly generated in the circumferential direction, the distribution of the magnetic flux density in the circumferential direction of the stator will vary. And the site
  • a recess that is recessed inward in the radial direction is formed in the outer peripheral portion of the connection portion of the divided cores adjacent to each other.
  • the divided cores adjacent to each other in the circumferential direction are rotatably connected by pins.
  • the recessed part formed in the outer peripheral part of the connection part of mutually adjacent division cores is formed so that the division cores adjacent to each other can rotate centering on a pin.
  • a recess is provided on the outer peripheral portion of the connected portion between the divided cores as disclosed in Patent Document 1 It is conceivable to press the stator into the motor housing.
  • the contact margin of the motor housing and the stator decreases, and the fixing strength of the stator press-fit into the motor housing becomes insufficient. There is.
  • the tip of the teeth is displaced in the circumferential direction of the stator by the electromagnetic force generated in the stator.
  • the outer peripheral portion of the split core is displaced, and this displacement is transmitted to the motor housing to vibrate the motor housing, which may generate an operation noise of the electric motor.
  • the present invention has been made in view of the above-described circumstances, and the stator is securely press-fitted and fixed to the motor housing to suppress the operation noise, and at the connection portion between the stator divided bodies adjacent to each other in the circumferential direction. It is an object of the present invention to provide an electric motor capable of suppressing the cogging torque by suppressing the occurrence of compressive stress.
  • the present invention adopts the following means in order to solve the above problems. That is, in the electric motor according to the present invention, a plurality of stator divisions are disposed in the circumferential direction, and a stator is formed by connecting adjacent stator divisions to each other, and a motor housing in which the stator is fixed by press fitting inside.
  • a relief portion is formed to avoid interference with the other, and the relief portion has an angle in the circumferential direction about the central axis of the stator per one connection portion as ⁇ , and the number of stator divisions is X
  • the coefficient is K
  • the relief portion is formed on at least one of the inner peripheral surface of the motor housing and the outer peripheral surface of the connecting portion of the stator divisions adjacent to each other, whereby the inner peripheral surface of the motor housing and the stator division It is possible to avoid interference with the other of the outer peripheral surface of the connecting portion of As a result, it is possible to suppress the occurrence of compressive stress due to interference with the motor housing at the connection portion of the stator divided body.
  • the connection part of stator division bodies is located in multiple places in the circumferential direction of a stator. Therefore, the relief portions formed on the outer peripheral portion of the connecting portion of the stator divided bodies are also located at a plurality of locations in the circumferential direction of the stator. For this reason, the stator fixed by press-fitting to the motor housing is securely fixed to the motor housing.
  • the relief portion is formed at nine locations in the circumferential direction, and the relief portion is centered around the central axis of the stator at one location.
  • it is formed in the range of 5 to 14 °.
  • the relief portion is 0.2% or more of the diameter of the stator in the radial direction of the stator with respect to the other of the inner peripheral surface of the motor housing and the outer peripheral surface of the connecting portion. It may be formed with a gap set to the dimension of.
  • the relief portion is formed on an outer peripheral surface of the stator, and is formed of an arc-shaped surface located radially inward with respect to the inner peripheral surface of the motor housing.
  • the relief portion is formed on a flat portion which is formed on the outer peripheral surface of the stator and spaced radially inward with respect to the inner peripheral surface of the motor housing. It is also good.
  • the relief portion may be a V-shaped or U-shaped recess formed on the outer peripheral surface of the stator and recessed inward in the radial direction with respect to the inner peripheral surface of the motor housing. Good.
  • the relief portion is formed on an inner peripheral surface of the motor housing, and is formed of an arc-shaped surface located radially outward with respect to the outer peripheral surface of the stator.
  • the stator is securely press-fit and fixed to the motor housing to suppress the operation noise, and the cogging torque is suppressed by suppressing the generation of the compressive stress at the connecting portion of the stator divided bodies adjacent to each other in the circumferential direction. It becomes possible.
  • FIG. 1 is a perspective view of the electric motor 1 according to the first embodiment. As shown to the same figure, the electric motor 1 becomes a drive source of electrical components, such as an electric power steering mounted in a vehicle, for example.
  • the electric motor 1 is a so-called brushless motor.
  • the electric motor 1 is provided radially inside the motor housing 2, the substantially cylindrical stator 3 housed in the motor housing 2, and the stator 3, and a rotor provided rotatably with respect to the stator 3 ( Not shown) and.
  • the motor housing 2 is formed of, for example, a material having excellent heat dissipation such as aluminum die casting.
  • the motor housing 2 has a bottomed cylindrical shape integrally including a cylindrical portion 21 extending in a cylindrical shape and an end closing portion 22 closing the one end of the cylindrical portion 21.
  • a flange portion 23 extending outward in the radial direction is formed at the other end of the cylindrical portion 21.
  • bolt insertion holes 23h through which bolts for fixing at predetermined positions of the vehicle body of the vehicle are formed are formed at a plurality of places.
  • FIG. 2 is a plan view of the electric motor 1.
  • FIG. 3 is a perspective view of the stator 3.
  • the stator 3 is formed in a substantially cylindrical shape.
  • the stator 3 is press-fit into the motor housing 2 in a state in which the central axis direction coincides with the central axis direction of the cylindrical portion 21 (see FIG. 1) of the motor housing 2.
  • the stator 3 includes a stator core 31, an insulator 32 covering the stator core 31, and a coil 33 wound on the stator 32 from above the insulator 32.
  • the stator core 31 includes a cylindrical core portion 34 forming a magnetic path, and a plurality of (nine in the present embodiment) teeth 35 protruding radially inward from the core portion 34.
  • the stator core 31 is formed of a plurality of (seven in the present embodiment) stator divisions 30 arranged in the circumferential direction.
  • FIG. 4 is a perspective view of the stator divided body 30.
  • FIG. FIG. 5 is a perspective view of the split core 36 constituting the stator split body 30.
  • FIG. FIG. 6 is an enlarged view of an essential part showing the connecting part 30J of the stator divided bodies 30 with each other.
  • each stator division body 30 protrudes radially inward from a division core 36 of an arc-shaped cross section formed by dividing the core portion 34 into a plurality of pieces in the circumferential direction. And the teeth 35 to be integrated.
  • Such a stator division body 30 is formed by laminating a plurality of metal plates in the axial direction.
  • the stator division body 30 is not limited to the case where the plurality of metal plates are stacked in the axial direction, and may be formed, for example, by pressure molding soft magnetic powder.
  • each split core 36 At the circumferential direction both ends of each split core 36, a fitting projection 37A and a fitting recess 37B for coupling to other split cores 36 adjacent in the circumferential direction are formed.
  • the fitting convex portion 37A formed at one circumferential end of the split core 36 is formed such that a radial intermediate portion of the split core 36 protrudes to one circumferential side.
  • the fitting concave portion 37B formed at the other end of the split core 36 in the circumferential direction is formed such that the radial intermediate portion of the split core 36 is recessed toward one side in the circumferential direction.
  • the fitting convex portion 37A of the split core 36 on one side in the circumferential direction fits in the fitting recess 37B of the split core 36 on the other side in the circumferential direction It is mutually connected by being united.
  • the insulator 32 is formed of an insulating material such as a resin. It is provided so as to cover the circumference of the teeth 35 of each stator divided body 30 and to be axially dividable. Then, by mounting the insulators 32 from both axial ends of the teeth 35, the teeth 35 are covered with the insulators 32.
  • the coil 33 is wound around the teeth 35 from above the insulator 32.
  • the coils 33 wound around the teeth 35 are arranged side by side in the circumferential direction in the order of the U phase, the V phase, and the W phase.
  • the stator 3 is further provided with the bus-bar member 38 arrange
  • the bus bar member 38 includes a coil connection portion 38a to which end portions of U-phase, V-phase, and W-phase coils 33 are connected, a three-phase connector terminal portion 38b to which a vehicle-side connector is connected, and coil connection portions And a bus bar main body 38c (see FIG. 3) for connecting each of the phases 38a and the connector terminal portion 38b.
  • a magnetic field is generated in the coil 33 for rotating a rotor (not shown).
  • Rotor One end of the rotor (not shown) is rotatably supported around its central axis via a bearing (not shown) provided at the end closing portion 22 of the motor housing 2.
  • the rotor is provided with a ring-shaped magnet on its outer peripheral surface.
  • the magnet is magnetized such that a plurality of magnetic poles are sequentially formed in the circumferential direction. For example, in the present embodiment, the magnet is magnetized in four poles.
  • the stator 3 is provided with a relief portion 50 on the outer peripheral surface of the connecting portion 30 J of the stator divisions 30 adjacent to each other to avoid interference with the inner peripheral surface 2 i of the motor housing 2. It is done.
  • nine stator divisions 30 are provided in the circumferential direction. Therefore, there are nine connecting portions 30J of stator divisions 30 adjacent to each other.
  • the relief portions 50 are formed on the outer peripheral surface of all the connection portions 30J, and provided at a total of nine places.
  • each relief portion 50 is formed of a recessed groove 51 having an arc-shaped surface 51 f.
  • the arcuate surface 51 f is located radially inward of the inner circumferential surface 2 i of the motor housing 2 at an interval, and is formed concentrically with the center of the stator 3.
  • the arc-shaped surface 51f is formed so as to straddle both sides in the circumferential direction in a portion where the end portions 30e and 30f of the outer peripheral surface side of the stator divided bodies 30 adjacent to each other in the connecting portion 30J abut.
  • the opening angle ⁇ of the relief 50 is 5 ° ⁇ ⁇ ⁇ 15 °. Therefore, the opening angle ⁇ of the relief portion 50 of the first embodiment satisfies the above formulas (1) and (2).
  • the recessed groove 51 has a gap set to a dimension d which is twice or more the maximum press-fit allowance between the motor housing 2 and the stator 3 in the radial direction of the stator 3 with respect to the inner peripheral surface 2i of the motor housing 2 It is formed.
  • the maximum press-fit allowance between the motor housing 2 and the stator 3 is set to 0.1 mm.
  • the arc-shaped surface 51 f of the recessed groove 51 is formed so as to separate a gap of a dimension d of 0.2 mm or more with respect to the inner peripheral surface 2 i of the motor housing 2.
  • the electric power supplied to the controller board (not shown) provided outside is selectively supplied to the coils 33 of the electric motor 1. Then, a predetermined magnetic field is formed on the stator 3 (the teeth 35), and a magnetic attractive force or repulsive force is generated between the magnetic field and the magnet of the rotor (not shown). Thereby, a rotor (not shown) rotates continuously.
  • the stator 3 is press-fit into the motor housing 2, but the relief portion 50 is formed on the outer peripheral surface of the connecting portion 30 J of the stator divisions 30 adjacent to each other.
  • the connecting portion 30J of the stator divided body 30 avoids interference with the inner peripheral surface 2i of the motor housing 2.
  • generation of compressive stress due to interference with the motor housing 2 can be suppressed in the connecting portion 30J of the stator divided body 30.
  • FIG. 7 is a diagram showing the results of simulation analysis of the distribution of compressive stress generated in the stator and the motor housing in which the relief portion 50 is not formed.
  • FIG. 8 is a diagram showing the results of simulation analysis of the distribution of compressive stress generated in the stator 3 including the relief 50 shown in the first embodiment and the motor housing 2.
  • FIG. 7 in the case of the stator in which the relief portion 50 is not formed, it can be confirmed that high compressive stress is generated in the connecting portion 100J of the stator divided bodies 100 adjacent to each other in the circumferential direction.
  • FIG. 8 in the case of the stator 3 provided with the relief portion 50 shown in the above embodiment, generation of high compressive stress is suppressed in the connection portion 30J of the stator divisions 30 adjacent to each other. You can confirm that.
  • FIG. 9 is a figure which shows the result of having obtained distribution of the magnetic flux density in the stator which does not form the relief part 50, and a motor housing by simulation analysis.
  • FIG. 10 is a diagram showing the results of simulation analysis of the magnetic flux density distribution in the motor housing 2 and the stator 3 provided with the relief 50 shown in the first embodiment.
  • the flow of magnetic flux is blocked by the portion P where the magnetic flux density is low in the connecting portion 100J of the stator divided bodies 100 adjacent to each other in the circumferential direction. You can confirm that.
  • FIG. 9 shows the case of the stator in which the relief portion 50 is not formed, the flow of magnetic flux is blocked by the portion P where the magnetic flux density is low in the connecting portion 100J of the stator divided bodies 100 adjacent to each other in the circumferential direction. You can confirm that.
  • FIG. 9 shows the case of the stator in which the relief portion 50 is not formed, the flow of magnetic flux is blocked by the portion P where the magnetic flux density is low in the connecting portion 100J of the stator divided bodies
  • the flow of the magnetic flux is caused by the low magnetic flux density portion in the connecting portion 30J of the stator divisions 30 adjacent to each other. It is possible to confirm that the blocked portion is reduced and the magnetic flux is continuously flowing in the circumferential direction.
  • the provision of the relief portion 50 makes it possible to make the compression stress distribution in the circumferential direction of the stator 3 uniform. As a result, in the electromagnetic steel sheet forming the stator 3, it is possible to suppress the partial flow of the magnetic flux from flowing, and to suppress the cogging torque generated when the electric motor 1 is operated.
  • FIG. 11 is a diagram showing a change in cogging torque when the opening angle ⁇ of the relief portion 50 is changed. As shown in the figure, by setting the opening angle ⁇ of the relief portion 50 to 4 ° or more, the cogging torque becomes lower compared to the case where the opening angle ⁇ is 0 °, that is, the relief portion 50 is not formed. Can be confirmed.
  • each relief portion 50 formed in the circumferential direction are formed such that the opening angle ⁇ per one location of the connection portion 30J satisfies the above-described formulas (1) and (2). More specifically, each relief portion 50 is formed such that the opening angle ⁇ is in the range of 5 ° to 14 °.
  • FIG. 12 is a diagram showing a change in displacement of the motor housing 2 that occurs during operation of the electric motor 1 when the opening angle ⁇ of the relief 50 is changed.
  • the opening angle ⁇ of the relief portion 50 when the opening angle ⁇ of the relief portion 50 is set to be larger than 15 °, the displacement of the stator division body 30 caused by the circumferential displacement of the teeth 35 which occurs during operation of the electric motor 1 It can be confirmed that the displacement amount of the motor housing 2 is large. Therefore, by setting the opening angle ⁇ of the relief portion 50 to 15 ° or less, the displacement amount of the motor housing 2 generated during the operation of the electric motor 1 is suppressed, and the stator 3 and the motor housing 2 are firmly fixed. , Suppress the operation noise of the electric motor 1. Further, by setting the opening angle ⁇ of the relief portion 50 to 14 ° or less, the displacement amount of the motor housing 2 is further suppressed, and the operation noise of the electric motor 1 is suppressed more reliably.
  • the stator 3 is formed by connecting the plurality of stator divisions 30 in the circumferential direction, and connecting the stator divisions 30 adjacent to each other, and is rotatable inward in the radial direction of the stator 3 And a motor housing 2 in which a stator 3 is fixed by press-fitting. Further, on the outer peripheral surface of the connecting portion 30J of the stator divided bodies 30 adjacent to each other in the stator 3, a relief portion 50 for avoiding interference with the inner peripheral surface 2i of the motor housing 2 is formed. The relief portion 50 is formed such that the opening angle ⁇ per one location of the connecting portion 30J satisfies the above-described equations (1) and (2).
  • interference with the inner circumferential surface 2i of the motor housing 2 can be avoided by forming the relief portion 50 on the outer circumferential surface of the connecting portion 30J of the stator divisions 30 adjacent to each other.
  • the connecting portions 30 J of the stator divided bodies 30 are located at a plurality of locations in the circumferential direction of the stator 3. Therefore, the relief portions 50 formed on the outer peripheral portion of the connecting portion 30J of the stator divided bodies 30 are also located at a plurality of locations in the circumferential direction of the stator 3.
  • the motor housing 2 is formed by forming the relief portions 50 formed at a plurality of locations such that the opening angle ⁇ per one location of the connection portion 30J satisfies the above formulas (1) and (2).
  • the stator 3 is fixed to the motor housing 2 by press-fitting. As a result, the motor housing 2 is displaced with respect to the stator 3 and the generation of the operation noise of the electric motor 1 can be suppressed.
  • relief portions 50 are formed at nine locations in the circumferential direction.
  • the relief portion 50 is formed in a range of 5 ° to 14 ° with respect to the central axis of the stator 3 at one point. According to such a configuration, the stator 3 and the motor housing 2 are firmly fixed while suppressing the generation of the compressive stress due to the interference with the motor housing 2 at the connecting portion 30J of the stator divided bodies 30 adjacent to each other. be able to. Therefore, generation of the operation noise of the electric motor 1 can be suppressed more reliably.
  • the clearance 50 is the maximum press-fit margin between the motor housing 2 and the stator 3 in the radial direction of the stator 3 with respect to the other of the inner peripheral surface 2 i of the motor housing 2 and the outer peripheral surface of the connecting portion 30 J It is formed with a gap set to a size of twice or more of. According to such a configuration, it is possible to reliably avoid interference with the motor housing 2 and prevent the generation of compressive stress in the connecting portions 30J of the stator divided bodies 30 adjacent to each other.
  • the relief portion 50 is formed on the outer peripheral surface of the stator 3 and is a recessed groove having an arc-shaped surface 51 f located radially inward with respect to the inner peripheral surface 2 i of the motor housing 2. It was made to be 51. According to such a configuration, by forming the relief portion 50 on the outer peripheral surface of the stator 3, interference with the motor housing 2 is surely avoided in the connecting portion 30J of the stator divided bodies 30 adjacent to each other, and a compression stress is generated. Can be suppressed.
  • FIG. 13 is a view showing an electric motor 1 in a first modified example of the first embodiment.
  • the relief portion 50B is formed on the outer peripheral surface of the stator 3 so as to be composed of a flat portion 52 positioned radially inward with respect to the inner peripheral surface 2i of the motor housing 2. It is also good.
  • the flat portion 52 is formed so that the end portions 30e and 30f on the outer peripheral surface side of the stator divided body 30 adjacent to each other in the connecting portion 30J abut on both sides in the circumferential direction.
  • the stator 3 can be securely press-fitted to the motor housing 2 and the operation noise can be suppressed. .
  • FIG. 14 is a view showing an electric motor 1 according to a second modification of the first embodiment.
  • the relief portion 50C is formed on the outer peripheral surface of the stator 3 so as to be composed of a flat portion 52B which is positioned radially inward with respect to the inner peripheral surface 2i of the motor housing 2. It is also good.
  • the flat portion 52B is formed so that the end portions 30e and 30f on the outer peripheral surface side of the stator divided body 30 adjacent to each other in the connecting portion 30J abut on both sides in the circumferential direction.
  • the flat portion 52B is formed offset to one side in the circumferential direction with respect to a portion where the end portions 30e and 30f on the outer peripheral surface side of the stator divided bodies 30 adjacent to each other abut each other.
  • the stator 3 can be securely press-fitted to the motor housing 2 and the operation noise can be suppressed.
  • FIG. 15 is a view showing an electric motor 1 according to a third modification of the first embodiment.
  • the relief portion 50D is formed on the outer peripheral surface of the stator 3 and includes a V-shaped recessed portion 53A formed so as to be recessed inward in the radial direction with respect to the inner peripheral surface 2i of the motor housing 2.
  • the concave portion 53A is formed so as to straddle both sides in the circumferential direction in a portion where the end portions 30e and 30f of the outer peripheral surface side of the stator divided body 30 adjacent to each other in the connecting portion 30J abut each other.
  • the stator 3 can be securely press-fitted to the motor housing 2 to suppress the operation noise.
  • FIG. 16 is a view showing an electric motor 1 according to a fourth modification of the first embodiment.
  • the relief portion 50E is formed of a U-shaped recess 53B formed on the outer peripheral surface of the stator 3 and recessed inward in the radial direction with respect to the inner peripheral surface 2i of the motor housing 2. You may The recessed portion 53B is formed so as to straddle both sides in the circumferential direction in a portion where the end portions 30e and 30f of the outer peripheral surface side of the stator divided body 30 adjacent to each other in the connecting portion 30J abut each other.
  • the stator 3 can be securely press-fitted to the motor housing 2 and the operation noise can be suppressed.
  • FIG. 17 is an enlarged view of an essential part showing a connecting part 30J of the stator divided bodies 30 constituting the electric motor 1F in the second embodiment.
  • the electric motor 1F is provided radially inward of the motor housing 2F, the substantially cylindrical stator 3F housed in the motor housing 2F, and the stator 3F, and rotates relative to the stator 3 And a rotor (not shown) provided possible.
  • no relief is formed on the outer peripheral surface 3g of the stator 3F.
  • the relief portion 50F is formed on the inner peripheral surface 2i of the motor housing 2F, and comprises a housing side recessed groove 54 having an arc-shaped surface 54f spaced apart from the outer peripheral surface of the stator 3 radially outward.
  • the housing-side recessed groove 54 is formed so as to straddle both sides in the circumferential direction at a position opposed to a portion where the end portions 30e and 30f of the outer peripheral surface side of the stator divided body 30 adjacent to each other abut in the connecting portion 30J. It is done.
  • Such a relief portion 50F avoids the interference between the motor housing 2F and the outer peripheral surface 3f of the stator 3F in the connecting portion 30J of the stator divided bodies 30 adjacent to each other in the stator 3F.
  • the coupling portion 30J of the stator divided body 30 is compressed due to interference with the motor housing 2F. Stress can be suppressed.
  • FIG. 18 is a diagram showing the results of simulation analysis of the distribution of the compressive stress generated in the stator 3F having the relief portion 50F shown in the second embodiment and the motor housing 2F. As shown in the figure, in the case of the motor housing 2F provided with the relief portion 50F, it can be confirmed that high compressive stress is not generated in the connecting portion 30J of the stator divisions 30 adjacent to each other in the stator 3F.
  • FIG. 19 is a diagram showing the results of simulation analysis of the magnetic flux density distribution in the motor housing 2FR and the stator 3F including the relief 50F described in the second embodiment.
  • the portion where the flow of the magnetic flux is blocked by the portion having a low magnetic flux density is reduced. Do. Then, it can be confirmed that the magnetic flux flows continuously in the circumferential direction.
  • the relief portions 50 F formed at a plurality of circumferential positions are formed such that the opening angle ⁇ per one position of the connection portion 30 J satisfies the above formulas (1) and (2).
  • the motor housing 2 is displaced.
  • the stator 3F can be securely press-fitted and fixed to the motor housing 2F to suppress the operation noise.
  • it is possible to suppress the cogging torque by suppressing the generation of the compressive stress at the connecting portion 30J of the divided cores 30 adjacent to each other in the circumferential direction.
  • composition of each part of electric motors 1 and 1F was explained.
  • the present invention is not limited to this, and the detailed configuration thereof can be changed as appropriate.
  • the case where the number of the stator division bodies 30 which comprise the stators 3 and 3F was nine was demonstrated.
  • the present invention is not limited to this, and the number of stator divisions 30 can be appropriately changed.
  • the number of stator divisions 30 may be twelve or the like.
  • the electric motors 1 and 1F are used for the electric power steering and the like, but the application thereof is not limited at all. Furthermore, the electric motors 1 and 1F may be integrally provided with a reduction gear unit. In addition to this, it is possible to select the configuration described in the above embodiment or to appropriately change it to another configuration without departing from the spirit of the present invention.

Abstract

The purpose of the present invention is to suppress operating noise by reliably press-fixing a stator in a motor housing, and to suppress cogging torque by suppressing the development of compressive stress where stator segments adjacent to each other in a circumferential direction are linked. An electric motor 1 is provided with: a stator 3 which includes a plurality of stator segments 30 arranged in the circumferential direction and which is formed by linking stator segments 30 that are adjacent to each other; and a motor housing 2 on the inside of which the stator 3 is fixed by pressing. At least one of an inner peripheral surface 2i of the motor housing 2 and an outer peripheral surface of a link portion 30J of the adjacent stator segments 30 of the stator 3 is formed with a clearance portion 50 for avoiding interference with the other of the inner peripheral surface 2i of the motor housing 2 and the outer peripheral surface of the link portion 30J. A plurality of the clearance portions 50 are formed in a range of a total of 45° to 126° in the circumferential direction about the central axis of the stator 3.

Description

電動モータElectric motor
　本発明は、電動モータに関するものである。 The present invention relates to an electric motor.
　電動モータとして、例えばブラシレスモータがある。一般的なブラシレスモータは、モータハウジングに固定されているステータと、ステータの径方向内側に回転自在に設けられたロータと、を有している。ステータは、モータハウジングに固定される円筒状のコア本体と、このコア本体の内周面から径方向内側に向かって放射状に突設された複数のティースと、を有している。各ティース間には、径方向内側が開口されたスロットがそれぞれ形成される。このスロットを介して、各ティースに巻線が巻回される。 An example of the electric motor is a brushless motor. A general brushless motor has a stator fixed to a motor housing and a rotor rotatably provided radially inward of the stator. The stator has a cylindrical core body fixed to the motor housing, and a plurality of teeth protruding radially inward from the inner peripheral surface of the core body. Slots opened radially inward are respectively formed between the teeth. A winding is wound on each tooth through this slot.
　このような電動モータにおいて、各ティースへの巻線の巻回作業を容易にし、巻線の占積率を向上させるために、ステータを、周方向に複数に分割してなる分割コアによって形成する場合がある。すなわち、ステータは、周方向に複数の分割コアを並べて配置することで形成されている（例えば、特許文献１参照）。
　これら複数の分割コアは、溶接や嵌合等によって、互いに隣り合う分割コア同士が一体に連結されている。 In such an electric motor, in order to facilitate the winding operation of the winding to each tooth and to improve the space factor of the winding, the stator is formed by a plurality of divided cores which are divided in the circumferential direction. There is a case. That is, the stator is formed by arranging and arranging a plurality of divided cores in the circumferential direction (see, for example, Patent Document 1).
The divided cores adjacent to each other are integrally connected by welding, fitting, or the like.
　ところで、複数の分割コアからなるステータを、モータハウジングに圧入して固定する場合、互いに隣り合う分割コア同士の連結部分において、モータハウジングとの間で圧縮応力が発生することがある。ステータを構成する電磁鋼板は、圧縮応力が生じると、その部分で磁束が流れにくくなる特性を有している。このため、ステータの周方向において、分割コア同士の連結部分で生じる圧縮応力によって、磁束密度が低い部分が複数個所に生じることとなる。分割コア同士の連結部分で生じる圧縮応力が、周方向において不均一に生じると、ステータの周方向における磁束密度の分布にばらつきが生じてしまう。そして、磁束の流れが部分的に阻害される部位が生じてしまう。その結果、電動モータを作動させたときに、コギングトルクが大きくなってしまう。 By the way, when pressing and fixing the stator which consists of a plurality of division cores into the motor housing, a compression stress may occur between the division cores adjacent to each other with the motor housing. The electromagnetic steel sheet constituting the stator has a characteristic that when a compressive stress is generated, the magnetic flux hardly flows in that portion. For this reason, in the circumferential direction of the stator, portions with low magnetic flux density are generated at a plurality of places due to the compressive stress generated at the connection portion between the divided cores. If the compressive stress generated at the connection portion between the split cores is unevenly generated in the circumferential direction, the distribution of the magnetic flux density in the circumferential direction of the stator will vary. And the site | part to which the flow of magnetic flux is interrupted | blocked partially will arise. As a result, when the electric motor is operated, the cogging torque becomes large.
　例えば、特許文献１に開示された回転電機では、互いに隣り合う分割コア同士の連結部分の外周部に、径方向内側に向かって窪む凹部が形成されている。この回転電機において、周方向で互いに隣り合う分割コア同士は、ピンによって回動可能に連結されている。互いに隣り合う分割コア同士の連結部分の外周部に形成された凹部は、ピンを中心として互いに隣り合う分割コア同士が回転できるように形成されたものである。 For example, in the rotating electrical machine disclosed in Patent Document 1, a recess that is recessed inward in the radial direction is formed in the outer peripheral portion of the connection portion of the divided cores adjacent to each other. In this electric rotating machine, the divided cores adjacent to each other in the circumferential direction are rotatably connected by pins. The recessed part formed in the outer peripheral part of the connection part of mutually adjacent division cores is formed so that the division cores adjacent to each other can rotate centering on a pin.
特開２０１５－９６０２４号公報JP, 2015-96024, A
　ここで、分割コア同士の連結部分に、モータハウジングとの間で圧縮応力が発生することを抑えるため、特許文献１に開示されたような、分割コア同士の連結部分の外周部に凹部を備えたステータを、モータハウジングに圧入することが考えられる。
　しかし、本発明者らの検討によると、凹部の大きさ等によっては、凹部を形成すると、モータハウジングとステータの接触代が減少し、モータハウジングに圧入したステータの固定強度が不足してしまう場合がある。すると、モータが作動した際に、ステータで発生する電磁力によって、ティースの先端部がステータの周方向に変位する。その結果、分割コアの外周部が変位し、この変位がモータハウジングに伝達されてモータハウジングが振動し、電動モータの作動音が発生する可能性があった。 Here, in order to suppress the generation of a compressive stress between the divided cores and the motor housing, a recess is provided on the outer peripheral portion of the connected portion between the divided cores as disclosed in Patent Document 1 It is conceivable to press the stator into the motor housing.
However, according to the study of the present inventors, depending on the size and the like of the recess, when the recess is formed, the contact margin of the motor housing and the stator decreases, and the fixing strength of the stator press-fit into the motor housing becomes insufficient. There is. Then, when the motor operates, the tip of the teeth is displaced in the circumferential direction of the stator by the electromagnetic force generated in the stator. As a result, the outer peripheral portion of the split core is displaced, and this displacement is transmitted to the motor housing to vibrate the motor housing, which may generate an operation noise of the electric motor.
　そこで、本発明は、上述した事情に鑑みてなされたものであって、モータハウジングにステータを確実に圧入固定して作動音を抑えるとともに、周方向で互いに隣り合うステータ分割体同士の連結部分で圧縮応力が生じるのを抑えて、コギングトルクを抑えることのできる電動モータを提供することである。 Therefore, the present invention has been made in view of the above-described circumstances, and the stator is securely press-fitted and fixed to the motor housing to suppress the operation noise, and at the connection portion between the stator divided bodies adjacent to each other in the circumferential direction. It is an object of the present invention to provide an electric motor capable of suppressing the cogging torque by suppressing the occurrence of compressive stress.
　本発明は、上記課題を解決するため、以下の手段を採用する。
　すなわち、本発明の電動モータは、周方向に複数のステータ分割体が配置され、互いに隣り合う前記ステータ分割体同士を連結してなるステータと、前記ステータが内側に圧入により固定されたモータハウジングと、を備え、前記モータハウジングの内周面、及び前記ステータにおいて互いに隣り合う前記ステータ分割体の連結部の外周面の少なくとも何れか一方に、前記モータハウジングの内周面及び前記連結部の外周面の他方との干渉を避ける逃げ部が形成され、前記逃げ部は、前記連結部１箇所あたりの前記ステータの中心軸を中心とした周方向の角度をθとし、前記ステータ分割体の個数をＸとし、係数をＫとしたとき、角度θ、個数Ｘ、及び係数Ｋが、
　θ＝（３６０÷Ｘ）×Ｋ
　０．１２５≦Ｋ≦０．３７５
を満たすように形成されていることを特徴とする。 The present invention adopts the following means in order to solve the above problems.
That is, in the electric motor according to the present invention, a plurality of stator divisions are disposed in the circumferential direction, and a stator is formed by connecting adjacent stator divisions to each other, and a motor housing in which the stator is fixed by press fitting inside. And at least one of the inner peripheral surface of the motor housing and the outer peripheral surface of the connecting portion of the stator divisions adjacent to each other in the stator, the inner peripheral surface of the motor housing and the outer peripheral surface of the connecting portion A relief portion is formed to avoid interference with the other, and the relief portion has an angle in the circumferential direction about the central axis of the stator per one connection portion as θ, and the number of stator divisions is X When the coefficient is K, the angle θ, the number X, and the coefficient K are
θ = (360 ÷ X) × K
0.125 ≦ K ≦ 0.375
It is characterized in that it is formed so as to satisfy
　このような構成によれば、モータハウジングの内周面、及び互いに隣り合うステータ分割体の連結部の外周面の少なくとも一方に逃げ部を形成することで、モータハウジングの内周面及びステータ分割体の連結部の外周面の他方との干渉を避けることができる。これにより、ステータ分割体の連結部に、モータハウジングとの干渉による圧縮応力が生じるのを抑えることができる。
　また、ステータ分割体同士の連結部は、ステータの周方向において複数個所に位置する。したがって、ステータ分割体同士の連結部の外周部に形成された逃げ部も、ステータの周方向において複数個所に位置する。このため、モータハウジングに対して圧入により固定されたステータが、モータハウジングに確実に固定される。 According to such a configuration, the relief portion is formed on at least one of the inner peripheral surface of the motor housing and the outer peripheral surface of the connecting portion of the stator divisions adjacent to each other, whereby the inner peripheral surface of the motor housing and the stator division It is possible to avoid interference with the other of the outer peripheral surface of the connecting portion of As a result, it is possible to suppress the occurrence of compressive stress due to interference with the motor housing at the connection portion of the stator divided body.
Moreover, the connection part of stator division bodies is located in multiple places in the circumferential direction of a stator. Therefore, the relief portions formed on the outer peripheral portion of the connecting portion of the stator divided bodies are also located at a plurality of locations in the circumferential direction of the stator. For this reason, the stator fixed by press-fitting to the motor housing is securely fixed to the motor housing.
　また、本発明の電動モータは、前記ステータ分割体を９個有し、周方向に９個所に前記逃げ部が形成され、前記逃げ部は、１個所あたり、前記ステータの中心軸を中心として、５～１４°の範囲に形成されているのが好ましい。 In the electric motor according to the present invention, nine of the stator divided bodies are formed, and the relief portion is formed at nine locations in the circumferential direction, and the relief portion is centered around the central axis of the stator at one location. Preferably, it is formed in the range of 5 to 14 °.
　このような構成によれば、互いに隣り合うステータ分割体同士の連結部において、モータハウジングとの干渉による圧縮応力が生じるのを抑えつつ、ステータとモータハウジングとを強固に固定することができる。 According to such a configuration, it is possible to firmly fix the stator and the motor housing while suppressing the generation of the compressive stress due to the interference with the motor housing at the connection portion of the stator divided bodies adjacent to each other.
　また、本発明の電動モータは、前記逃げ部は、前記モータハウジングの内周面及び前記連結部の外周面の他方に対し、前記ステータの径方向において、前記ステータの直径の０．２％以上の寸法に設定された隙間を有して形成されているようにしてもよい。 In the electric motor according to the present invention, the relief portion is 0.2% or more of the diameter of the stator in the radial direction of the stator with respect to the other of the inner peripheral surface of the motor housing and the outer peripheral surface of the connecting portion. It may be formed with a gap set to the dimension of.
　このような構成によれば、互いに隣り合うステータ分割体同士の連結部において、モータハウジングとの干渉を確実に避け、圧縮応力が生じるのを抑えることができる。 According to such a configuration, it is possible to reliably avoid interference with the motor housing and to suppress the occurrence of compressive stress in the connection portion between the stator divided bodies adjacent to each other.
　また、本発明の電動モータは、前記逃げ部は、前記ステータの外周面に形成され、前記モータハウジングの内周面に対して径方向内側に間隔を隔てて位置する円弧状面からなるようにしてもよい。 Further, in the electric motor according to the present invention, the relief portion is formed on an outer peripheral surface of the stator, and is formed of an arc-shaped surface located radially inward with respect to the inner peripheral surface of the motor housing. May be
　また、本発明の電動モータは、前記逃げ部は、前記ステータの外周面に形成され、前記モータハウジングの内周面に対して径方向内側に間隔を隔てて位置する平面部からなるようにしてもよい。 Further, in the electric motor according to the present invention, the relief portion is formed on a flat portion which is formed on the outer peripheral surface of the stator and spaced radially inward with respect to the inner peripheral surface of the motor housing. It is also good.
　さらに、前記逃げ部は、前記ステータの外周面に形成され、前記モータハウジングの内周面に対して径方向内側に窪んで形成されたＶ字状又はＵ字状の凹部からなるようにしてもよい。 Furthermore, the relief portion may be a V-shaped or U-shaped recess formed on the outer peripheral surface of the stator and recessed inward in the radial direction with respect to the inner peripheral surface of the motor housing. Good.
　このような構成によれば、ステータの外周面に逃げ部を形成することで、互いに隣り合うステータ分割体同士の連結部において、モータハウジングとの干渉を確実に避け、圧縮応力が生じるのを抑えることができる。 According to such a configuration, by forming the relief portion on the outer peripheral surface of the stator, interference with the motor housing is surely avoided at the connection portion of the stator divisions adjacent to each other, and the generation of the compressive stress is suppressed. be able to.
　また、本発明の電動モータは、前記逃げ部は、前記モータハウジングの内周面に形成され、前記ステータの外周面に対して径方向外側に間隔を隔てて位置する円弧状面からなるようにしてもよい。 Further, in the electric motor of the present invention, the relief portion is formed on an inner peripheral surface of the motor housing, and is formed of an arc-shaped surface located radially outward with respect to the outer peripheral surface of the stator. May be
　このような構成によれば、モータハウジングの内周面に逃げ部を形成することで、互いに隣り合うステータ分割体同士の連結部において、モータハウジングとの干渉を確実に避け、圧縮応力が生じるのを抑えることができる。 According to such a configuration, by forming the relief portion on the inner peripheral surface of the motor housing, interference with the motor housing is surely avoided at the connection portion between adjacent stator divided bodies, and a compressive stress is generated. Can be reduced.
　本発明によれば、モータハウジングにステータを確実に圧入固定して作動音を抑えるとともに、周方向で互いに隣り合うステータ分割体同士の連結部分で圧縮応力が生じるのを抑えて、コギングトルクを抑えることが可能となる。 According to the present invention, the stator is securely press-fit and fixed to the motor housing to suppress the operation noise, and the cogging torque is suppressed by suppressing the generation of the compressive stress at the connecting portion of the stator divided bodies adjacent to each other in the circumferential direction. It becomes possible.
本発明の第１の実施形態における電動モータの斜視図である。It is a perspective view of the electric motor in a 1st embodiment of the present invention. 本発明の第１の実施形態における電動モータの平面図である。It is a top view of the electric motor in a 1st embodiment of the present invention. 本発明の第１の実施形態における電動モータを構成するステータの斜視図である。It is a perspective view of a stator which constitutes an electric motor in a 1st embodiment of the present invention. 本発明の第１の実施形態における電動モータのステータを構成するステータ分割体３０の斜視図である。It is a perspective view of stator division object 30 which constitutes a stator of an electric motor in a 1st embodiment of the present invention. 本発明の第１の実施形態におけるステータ分割体を構成する分割コアの斜視図である。It is a perspective view of a division core which constitutes a stator division object in a 1st embodiment of the present invention. 本発明の第１の実施形態におけるステータ分割体同士の連結部を示す要部拡大図である。It is a principal part enlarged view which shows the connection part of the stator division bodies in the 1st Embodiment of this invention. 逃げ部を形成しないステータとモータハウジングに生じる圧縮応力の分布を、シミュレーション解析により得た結果を示す図である。It is a figure which shows the result of having obtained distribution of the compression stress which arises in the stator and motor housing which do not form a relief part by simulation analysis. 本発明の第１の実施形態における逃げ部を備えたステータとモータハウジング２に生じる圧縮応力の分布を、シミュレーション解析により得た結果を示す図である。It is a figure which shows the result of having obtained distribution of the compression stress which arises in the stator provided with the relief part in 1st Embodiment of this invention, and the motor housing 2 by simulation analysis. 逃げ部を形成しないステータとモータハウジングにおける磁束密度の分布を、シミュレーション解析により得た結果を示す図である。It is a figure which shows the result of having obtained distribution of the magnetic flux density in the stator which does not form a relief part, and a motor housing by simulation analysis. 本発明の第１の実施形態における逃げ部を備えるステータとモータハウジングにおける磁束密度の分布を、シミュレーション解析により得た結果を示す図である。It is a figure which shows the result of having obtained distribution of the magnetic flux density in the stator provided with the relief part in the 1st Embodiment of this invention, and a motor housing by simulation analysis. 本発明の第１の実施形態における逃げ部の開き角を変化させた場合のコギングトルクの変化を示す図である。It is a figure which shows the change of the cogging torque at the time of changing the opening angle of the relief part in the 1st Embodiment of this invention. 本発明の第１の実施形態における逃げ部の開き角を変化させた場合の、電動モータの作動中に生じるモータハウジングの変位量の変化を示す図である。It is a figure which shows the change of the displacement amount of the motor housing which arises during the action | operation of an electric motor at the time of changing the opening angle of the relief part in the 1st Embodiment of this invention. 本発明の第１の実施形態における電動モータの第１変形例を示す図である。It is a figure which shows the 1st modification of the electric motor in the 1st Embodiment of this invention. 本発明の第１の実施形態における電動モータの第２変形例を示す図である。It is a figure which shows the 2nd modification of the electric motor in the 1st Embodiment of this invention. 本発明の第１の実施形態における電動モータの第３変形例を示す図である。It is a figure which shows the 3rd modification of the electric motor in the 1st Embodiment of this invention. 本発明の第１の実施形態における電動モータの第４変形例を示す図である。It is a figure which shows the 4th modification of the electric motor in the 1st Embodiment of this invention. 本発明の第２の実施形態における電動モータを構成するステータ分割体同士の連結部を示す要部拡大図である。It is a principal part enlarged view which shows the connection part of the stator division bodies which comprise the electric motor in the 2nd Embodiment of this invention. 本発明の第２の実施形態における逃げ部を備えるステータとモータハウジングに生じる圧縮応力の分布を、シミュレーション解析により得た結果を示す図である。It is a figure which shows the result of having obtained distribution of the compressive stress which arises in the stator provided with the relief part in the 2nd Embodiment of this invention, and a motor housing by simulation analysis. 本発明の第２の実施形態における逃げ部を備えるステータとモータハウジングにおける磁束密度の分布を、シミュレーション解析により得た結果を示す図である。It is a figure which shows the result of having obtained distribution of the magnetic flux density in the stator provided with the relief part in the 2nd Embodiment of this invention, and a motor housing by simulation analysis.
　次に、本発明の実施形態に係る電動モータについて、図面を参照して説明をする。 Next, an electric motor according to an embodiment of the present invention will be described with reference to the drawings.
（第１の実施形態）
　図１は、第１の実施形態における電動モータ１の斜視図である。
　同図に示すように、電動モータ１は、例えば車両に搭載される電動パワーステアリング等の電装品の駆動源となるものである。 First Embodiment
FIG. 1 is a perspective view of the electric motor 1 according to the first embodiment.
As shown to the same figure, the electric motor 1 becomes a drive source of electrical components, such as an electric power steering mounted in a vehicle, for example.
（電動モータ）
　電動モータ１は、いわゆるブラシレスモータである。電動モータ１は、モータハウジング２と、モータハウジング２内に収納されている略円筒状のステータ３と、ステータ３の径方向内側に設けられ、ステータ３に対して回転可能に設けられたロータ（図示無し）と、を備えている。 (Electric motor)
The electric motor 1 is a so-called brushless motor. The electric motor 1 is provided radially inside the motor housing 2, the substantially cylindrical stator 3 housed in the motor housing 2, and the stator 3, and a rotor provided rotatably with respect to the stator 3 ( Not shown) and.
（モータハウジング）
　モータハウジング２は、例えばアルミダイキャスト等の放熱性の優れた材料に形成されている。モータハウジング２は、円筒状に延びる筒状部２１と、筒状部２１の一端を閉塞する端部閉塞部２２と、を一体に備えた有底筒状をなしている。モータハウジング２は、筒状部２１の他端に、径方向外側に延びるフランジ部２３が形成されている。フランジ部２３には、車両の車体の所定位置に固定するためのボルトが挿通されるボルト挿通穴２３ｈが、複数個所に形成されている。 (Motor housing)
The motor housing 2 is formed of, for example, a material having excellent heat dissipation such as aluminum die casting. The motor housing 2 has a bottomed cylindrical shape integrally including a cylindrical portion 21 extending in a cylindrical shape and an end closing portion 22 closing the one end of the cylindrical portion 21. In the motor housing 2, a flange portion 23 extending outward in the radial direction is formed at the other end of the cylindrical portion 21. In the flange portion 23, bolt insertion holes 23h through which bolts for fixing at predetermined positions of the vehicle body of the vehicle are formed are formed at a plurality of places.
（ステータ）
　図２は、電動モータ１の平面図である。図３は、ステータ３の斜視図である。
　図２に示すように、ステータ３は、略円筒状に形成されている。ステータ３は、その中心軸方向とモータハウジング２の筒状部２１（図１参照）の中心軸方向とが一致した状態で、モータハウジング２に圧入されている。
　図２、図３に示すように、ステータ３は、ステータコア３１と、ステータコア３１を被覆するインシュレータ３２と、このインシュレータ３２の上からステータコア３１に巻回されるコイル３３と、を備えている。 (Stator)
FIG. 2 is a plan view of the electric motor 1. FIG. 3 is a perspective view of the stator 3.
As shown in FIG. 2, the stator 3 is formed in a substantially cylindrical shape. The stator 3 is press-fit into the motor housing 2 in a state in which the central axis direction coincides with the central axis direction of the cylindrical portion 21 (see FIG. 1) of the motor housing 2.
As shown in FIGS. 2 and 3, the stator 3 includes a stator core 31, an insulator 32 covering the stator core 31, and a coil 33 wound on the stator 32 from above the insulator 32.
　ステータコア３１は、磁路を形成する円筒状のコア部３４と、コア部３４から径方向内側に向かって突出する複数（本実施形態においては９個）のティース３５と、を備えている。このステータコア３１は、周方向に複数（本実施形態においては９個）配置されたステータ分割体３０から形成されている。 The stator core 31 includes a cylindrical core portion 34 forming a magnetic path, and a plurality of (nine in the present embodiment) teeth 35 protruding radially inward from the core portion 34. The stator core 31 is formed of a plurality of (seven in the present embodiment) stator divisions 30 arranged in the circumferential direction.
　図４は、ステータ分割体３０の斜視図である。図５は、ステータ分割体３０を構成する分割コア３６の斜視図である。図６は、ステータ分割体３０同士の連結部３０Ｊを示す要部拡大図である。
　図４、図５に示すように、各ステータ分割体３０は、コア部３４を周方向に複数に分割してなる円弧状断面の分割コア３６と、分割コア３６から径方向内側に向かって突出するティース３５と、を一体に有している。このようなステータ分割体３０は、複数の金属板を軸方向に積層することにより形成されている。なお、ステータ分割体３０は、複数の金属板を軸方向に積層して形成する場合に限られるものではなく、例えば、軟磁性粉を加圧成形することにより形成してもよい。 FIG. 4 is a perspective view of the stator divided body 30. FIG. FIG. 5 is a perspective view of the split core 36 constituting the stator split body 30. FIG. FIG. 6 is an enlarged view of an essential part showing the connecting part 30J of the stator divided bodies 30 with each other.
As shown in FIGS. 4 and 5, each stator division body 30 protrudes radially inward from a division core 36 of an arc-shaped cross section formed by dividing the core portion 34 into a plurality of pieces in the circumferential direction. And the teeth 35 to be integrated. Such a stator division body 30 is formed by laminating a plurality of metal plates in the axial direction. The stator division body 30 is not limited to the case where the plurality of metal plates are stacked in the axial direction, and may be formed, for example, by pressure molding soft magnetic powder.
　各分割コア３６の周方向両端部には、周方向で隣り合う他の分割コア３６と連結するための嵌合凸部３７Ａ、嵌合凹部３７Ｂが形成されている。分割コア３６の周方向一方の端部に形成された嵌合凸部３７Ａは、分割コア３６の径方向中間部が、周方向一方の側に突出して形成されている。分割コア３６の周方向他方の端部に形成された嵌合凹部３７Ｂは、分割コア３６の径方向中間部が周方向一方の側に窪んで形成されている。 At the circumferential direction both ends of each split core 36, a fitting projection 37A and a fitting recess 37B for coupling to other split cores 36 adjacent in the circumferential direction are formed. The fitting convex portion 37A formed at one circumferential end of the split core 36 is formed such that a radial intermediate portion of the split core 36 protrudes to one circumferential side. The fitting concave portion 37B formed at the other end of the split core 36 in the circumferential direction is formed such that the radial intermediate portion of the split core 36 is recessed toward one side in the circumferential direction.
　図６に示すように、互いに隣り合うステータ分割体３０同士は、周方向一方の側の分割コア３６の嵌合凸部３７Ａが、周方向他方の側の分割コア３６の嵌合凹部３７Ｂに嵌合されることにより、互いに連結されている。 As shown in FIG. 6, in the stator divided bodies 30 adjacent to each other, the fitting convex portion 37A of the split core 36 on one side in the circumferential direction fits in the fitting recess 37B of the split core 36 on the other side in the circumferential direction It is mutually connected by being united.
　図４に詳示するように、インシュレータ３２は、樹脂等の絶縁性材料により形成されている。各ステータ分割体３０のティース３５の周囲を覆うように、且つ軸方向に分割可能に設けられている。そすて、ティース３５の軸方向両端からインシュレータ３２を装着することにより、このインシュレータ３２によってティース３５が被覆される。 As shown in detail in FIG. 4, the insulator 32 is formed of an insulating material such as a resin. It is provided so as to cover the circumference of the teeth 35 of each stator divided body 30 and to be axially dividable. Then, by mounting the insulators 32 from both axial ends of the teeth 35, the teeth 35 are covered with the insulators 32.
　コイル３３は、インシュレータ３２の上から、各ティース３５に巻回されている。本実施形態において、各ティース３５に巻回されたコイル３３は、Ｕ相、Ｖ相、Ｗ相の順に周方向に並んで配置される。 The coil 33 is wound around the teeth 35 from above the insulator 32. In the present embodiment, the coils 33 wound around the teeth 35 are arranged side by side in the circumferential direction in the order of the U phase, the V phase, and the W phase.
　図１、図３に示すように、ステータ３は、軸方向一端側に配置されたバスバー部材３８をさらに備えている。バスバー部材３８は、Ｕ相、Ｖ相、Ｗ相のコイル３３の端部が接続されるコイル接続部３８ａと、車体側のコネクタが接続される３相のコネクタ端子部３８ｂと、各コイル接続部３８ａとコネクタ端子部３８ｂとを相ごとに接続するバスバー本体３８ｃ（図３参照）と、を備えている。各コイル３３に給電が行われると、このコイル３３に、ロータ（図示無し）を回転させるための磁界が生成される。 As shown to FIG. 1, FIG. 3, the stator 3 is further provided with the bus-bar member 38 arrange | positioned at the axial direction one end side. The bus bar member 38 includes a coil connection portion 38a to which end portions of U-phase, V-phase, and W-phase coils 33 are connected, a three-phase connector terminal portion 38b to which a vehicle-side connector is connected, and coil connection portions And a bus bar main body 38c (see FIG. 3) for connecting each of the phases 38a and the connector terminal portion 38b. When each coil 33 is fed, a magnetic field is generated in the coil 33 for rotating a rotor (not shown).
（ロータ）
　ロータ（図示無し）は、その一端が、モータハウジング２の端部閉塞部２２に設けられた図示しない軸受を介し、その中心軸回りに回転自在に支持されている。このロータは、その外周面に、リング状のマグネットを備えている。このマグネットには、複数の磁極が周方向に順番に形成されるように着磁されている。例えば、本実施形態では、マグネットは、４極に着磁されている。 (Rotor)
One end of the rotor (not shown) is rotatably supported around its central axis via a bearing (not shown) provided at the end closing portion 22 of the motor housing 2. The rotor is provided with a ring-shaped magnet on its outer peripheral surface. The magnet is magnetized such that a plurality of magnetic poles are sequentially formed in the circumferential direction. For example, in the present embodiment, the magnet is magnetized in four poles.
（逃げ部）
　図２、図６に示すように、上記ステータ３には、互いに隣り合うステータ分割体３０の連結部３０Ｊの外周面に、モータハウジング２の内周面２ｉとの干渉を避ける逃げ部５０が形成されている。
　本実施の形態において、ステータ分割体３０は、周方向に９個設けられている。したがって、互いに隣り合うステータ分割体３０の連結部３０Ｊは９個所である。逃げ部５０は、全ての連結部３０Ｊの外周面に形成され、計９個所に設けられている。 (Runaway part)
As shown in FIG. 2 and FIG. 6, the stator 3 is provided with a relief portion 50 on the outer peripheral surface of the connecting portion 30 J of the stator divisions 30 adjacent to each other to avoid interference with the inner peripheral surface 2 i of the motor housing 2. It is done.
In the present embodiment, nine stator divisions 30 are provided in the circumferential direction. Therefore, there are nine connecting portions 30J of stator divisions 30 adjacent to each other. The relief portions 50 are formed on the outer peripheral surface of all the connection portions 30J, and provided at a total of nine places.
　図６に示すように、各逃げ部５０は、円弧状面５１ｆを有した凹溝５１からなる。円弧状面５１ｆは、モータハウジング２の内周面２ｉに対し、径方向内側に間隔を隔てて位置し、ステータ３の中心と同心円状に形成されている。円弧状面５１ｆは、連結部３０Ｊにおいて、互いに隣り合うステータ分割体３０の外周面側の端部３０ｅ，３０ｆ同士が突き当たる部分を、周方向の両側に跨がるように形成されている。 As shown in FIG. 6, each relief portion 50 is formed of a recessed groove 51 having an arc-shaped surface 51 f. The arcuate surface 51 f is located radially inward of the inner circumferential surface 2 i of the motor housing 2 at an interval, and is formed concentrically with the center of the stator 3. The arc-shaped surface 51f is formed so as to straddle both sides in the circumferential direction in a portion where the end portions 30e and 30f of the outer peripheral surface side of the stator divided bodies 30 adjacent to each other in the connecting portion 30J abut.
　このような凹溝５１からなる逃げ部５０は、連結部３０Ｊの１箇所あたりにおけるステータ３の中心軸を中心とした開き角（周方向の角度、以下、単に開き角という）をθとし、ステータ分割体３０の個数をＸとし、係数をＫとしたとき、角度θ、個数Ｘ、及び係数Ｋが、
　θ＝（３６０÷Ｘ）×Ｋ　　　　　・・・（１）
　０．１２５≦Ｋ≦０．３７５　・・・（２）
を満たすように形成されている。
　本第１の実施形態において、逃げ部５０は、開き角θが、５°～１４°の範囲に形成されている。本第１の実施形態において、ステータ分割体３０の個数は９個であるので、上記式（１）のＸに９を代入すると、逃げ部５０の開き角θは、５°≦θ≦１５°になるので、本第１の実施形態の逃げ部５０の開き角θは、上記式（１）、式（２）を満たす。 The clearance portion 50 formed of such recessed grooves 51 has an opening angle (circumferential angle, hereinafter simply referred to as opening angle) centered on the central axis of the stator 3 at one location of the connecting portion 30J as θ, and the stator Assuming that the number of divided bodies 30 is X and the coefficient is K, the angle θ, the number X, and the coefficient K are
θ = (360 ÷ X) × K (1)
0.125 ≦ K ≦ 0.375 (2)
It is formed to meet the
In the first embodiment, the relief portion 50 is formed to have an opening angle θ in the range of 5 ° to 14 °. In the first embodiment, the number of stator divisions 30 is nine. Therefore, when 9 is substituted for X in the above equation (1), the opening angle θ of the relief 50 is 5 ° ≦ θ ≦ 15 °. Therefore, the opening angle θ of the relief portion 50 of the first embodiment satisfies the above formulas (1) and (2).
　また、凹溝５１は、モータハウジング２の内周面２ｉに対し、ステータ３の径方向において、モータハウジング２とステータ３との最大圧入代の２倍以上の寸法ｄに設定された隙間を有して形成されている。本実施形態において、モータハウジング２とステータ３との最大圧入代は０．１ｍｍに設定されている。また、凹溝５１の円弧状面５１ｆは、モータハウジング２の内周面２ｉに対し、０．２ｍｍ以上の寸法ｄの隙間を隔てるよう形成されている。 Further, the recessed groove 51 has a gap set to a dimension d which is twice or more the maximum press-fit allowance between the motor housing 2 and the stator 3 in the radial direction of the stator 3 with respect to the inner peripheral surface 2i of the motor housing 2 It is formed. In the present embodiment, the maximum press-fit allowance between the motor housing 2 and the stator 3 is set to 0.1 mm. Further, the arc-shaped surface 51 f of the recessed groove 51 is formed so as to separate a gap of a dimension d of 0.2 mm or more with respect to the inner peripheral surface 2 i of the motor housing 2.
　上記したような電動モータ１は、外部に設けられたコントローラ基板（図示無し）に供給された電力が、電動モータ１の各コイル３３に選択的に供給される。すると、ステータ３（ティース３５）に所定の磁界が形成され、この磁界とロータ（図示無し）のマグネットとの間で磁気的な吸引力や反発力が生じる。これにより、ロータ（図示無し）が継続的に回転する。 In the electric motor 1 as described above, the electric power supplied to the controller board (not shown) provided outside is selectively supplied to the coils 33 of the electric motor 1. Then, a predetermined magnetic field is formed on the stator 3 (the teeth 35), and a magnetic attractive force or repulsive force is generated between the magnetic field and the magnet of the rotor (not shown). Thereby, a rotor (not shown) rotates continuously.
　このような電動モータ１において、ステータ３は、モータハウジング２に圧入されているが、互いに隣り合うステータ分割体３０の連結部３０Ｊの外周面に逃げ部５０が形成されている。これにより、ステータ分割体３０の連結部３０Ｊが、モータハウジング２の内周面２ｉとの干渉を避ける。これにより、ステータ分割体３０の連結部３０Ｊに、モータハウジング２との干渉による圧縮応力が生じてしまうのを抑えられる。 In the electric motor 1 as described above, the stator 3 is press-fit into the motor housing 2, but the relief portion 50 is formed on the outer peripheral surface of the connecting portion 30 J of the stator divisions 30 adjacent to each other. Thereby, the connecting portion 30J of the stator divided body 30 avoids interference with the inner peripheral surface 2i of the motor housing 2. As a result, generation of compressive stress due to interference with the motor housing 2 can be suppressed in the connecting portion 30J of the stator divided body 30.
　図７は、逃げ部５０を形成しないステータとモータハウジングに生じる圧縮応力の分布を、シミュレーション解析により得た結果を示す図である。図８は、上記第１の実施形態で示した逃げ部５０を備えるステータ３とモータハウジング２とに生じる圧縮応力の分布を、シミュレーション解析により得た結果を示す図である。
　図７に示すように、逃げ部５０を形成しないステータの場合、周方向で互いに隣り合うステータ分割体１００同士の連結部１００Ｊにおいて、高い圧縮応力が生じていることが確認できる。これに対し、図８に示すように、上記実施形態で示した逃げ部５０を備えるステータ３の場合、互いに隣り合うステータ分割体３０の連結部３０Ｊにおいて、高い圧縮応力の発生が抑えられていることが確認できる。 FIG. 7 is a diagram showing the results of simulation analysis of the distribution of compressive stress generated in the stator and the motor housing in which the relief portion 50 is not formed. FIG. 8 is a diagram showing the results of simulation analysis of the distribution of compressive stress generated in the stator 3 including the relief 50 shown in the first embodiment and the motor housing 2.
As shown in FIG. 7, in the case of the stator in which the relief portion 50 is not formed, it can be confirmed that high compressive stress is generated in the connecting portion 100J of the stator divided bodies 100 adjacent to each other in the circumferential direction. On the other hand, as shown in FIG. 8, in the case of the stator 3 provided with the relief portion 50 shown in the above embodiment, generation of high compressive stress is suppressed in the connection portion 30J of the stator divisions 30 adjacent to each other. You can confirm that.
　また、図９は、逃げ部５０を形成しないステータとモータハウジングにおける磁束密度の分布を、シミュレーション解析により得た結果を示す図である。図１０は、上記第１の実施形態で示した逃げ部５０を備えるステータ３とモータハウジング２とにおける磁束密度の分布を、シミュレーション解析により得た結果を示す図である。
　図９に示すように、逃げ部５０を形成しないステータの場合、周方向で互いに隣り合うステータ分割体１００同士の連結部１００Ｊにおいて、磁束密度が低い部分Ｐによって、磁束の流れが阻害されていることが確認できる。これに対し、図１０に示すように、上記実施形態で示した逃げ部５０を備えるステータ３の場合、互いに隣り合うステータ分割体３０の連結部３０Ｊにおいて、磁束密度が低い部分によって磁束の流れが阻害される部分が減り、磁束が周方向に連続的に流れていることが確認できる。 Moreover, FIG. 9 is a figure which shows the result of having obtained distribution of the magnetic flux density in the stator which does not form the relief part 50, and a motor housing by simulation analysis. FIG. 10 is a diagram showing the results of simulation analysis of the magnetic flux density distribution in the motor housing 2 and the stator 3 provided with the relief 50 shown in the first embodiment.
As shown in FIG. 9, in the case of the stator in which the relief portion 50 is not formed, the flow of magnetic flux is blocked by the portion P where the magnetic flux density is low in the connecting portion 100J of the stator divided bodies 100 adjacent to each other in the circumferential direction. You can confirm that. On the other hand, as shown in FIG. 10, in the case of the stator 3 provided with the relief portion 50 shown in the above embodiment, the flow of the magnetic flux is caused by the low magnetic flux density portion in the connecting portion 30J of the stator divisions 30 adjacent to each other. It is possible to confirm that the blocked portion is reduced and the magnetic flux is continuously flowing in the circumferential direction.
　このように、逃げ部５０を備えることにより、ステータ３の周方向における圧縮応力分布の均一化を図ることができる。その結果、ステータ３を形成する電磁鋼板において、部分的に磁束が流れにくくなるのを抑えることができ、電動モータ１を作動させたときに生じるコギングトルクを抑える。 As described above, the provision of the relief portion 50 makes it possible to make the compression stress distribution in the circumferential direction of the stator 3 uniform. As a result, in the electromagnetic steel sheet forming the stator 3, it is possible to suppress the partial flow of the magnetic flux from flowing, and to suppress the cogging torque generated when the electric motor 1 is operated.
　図１１は、逃げ部５０の開き角θを変化させた場合のコギングトルクの変化を示す図である。
　同図に示すように、逃げ部５０の開き角θを４°以上に設定することにより、開き角θを０°、すなわち逃げ部５０を形成しない場合と比較して、コギングトルクが低くなっていることが確認できる。 FIG. 11 is a diagram showing a change in cogging torque when the opening angle θ of the relief portion 50 is changed.
As shown in the figure, by setting the opening angle θ of the relief portion 50 to 4 ° or more, the cogging torque becomes lower compared to the case where the opening angle θ is 0 °, that is, the relief portion 50 is not formed. Can be confirmed.
　また、周方向に複数形成された逃げ部５０は、連結部３０Ｊの１箇所あたりの開き角θが、上記式（１）、式（２）を満たすように形成されている。より具体的には、各逃げ部５０は、開き角θが５°～１４°の範囲となるように形成されている。 Further, the plurality of relief portions 50 formed in the circumferential direction are formed such that the opening angle θ per one location of the connection portion 30J satisfies the above-described formulas (1) and (2). More specifically, each relief portion 50 is formed such that the opening angle θ is in the range of 5 ° to 14 °.
　図１２は、逃げ部５０の開き角θを変化させた場合の、電動モータ１の作動中に生じるモータハウジング２の変位量の変化を示す図である。
　同図に示すように、逃げ部５０の開き角θを１５°よりも大きく設定すると、電動モータ１の作動中に生じるティース３５の周方向の変位にともなうステータ分割体３０の変位に起因する、モータハウジング２の変位量が大きくなっていることが確認できる。したがって、逃げ部５０の開き角θを、１５°以下に設定することにより、電動モータ１の作動中に生じるモータハウジング２の変位量を抑え、ステータ３とモータハウジング２とを強固に固定して、電動モータ１の作動音を抑える。さらに、逃げ部５０の開き角θを１４°以下に設定することにより、モータハウジング２の変位量をさらに抑え、より確実に電動モータ１の作動音を抑える。 FIG. 12 is a diagram showing a change in displacement of the motor housing 2 that occurs during operation of the electric motor 1 when the opening angle θ of the relief 50 is changed.
As shown in the figure, when the opening angle θ of the relief portion 50 is set to be larger than 15 °, the displacement of the stator division body 30 caused by the circumferential displacement of the teeth 35 which occurs during operation of the electric motor 1 It can be confirmed that the displacement amount of the motor housing 2 is large. Therefore, by setting the opening angle θ of the relief portion 50 to 15 ° or less, the displacement amount of the motor housing 2 generated during the operation of the electric motor 1 is suppressed, and the stator 3 and the motor housing 2 are firmly fixed. , Suppress the operation noise of the electric motor 1. Further, by setting the opening angle θ of the relief portion 50 to 14 ° or less, the displacement amount of the motor housing 2 is further suppressed, and the operation noise of the electric motor 1 is suppressed more reliably.
　このように、上述の電動モータ１は、周方向に複数のステータ分割体３０が配置され、互いに隣り合うステータ分割体３０同士を連結してなるステータ３と、ステータ３の径方向内側に回転自在に設けられたロータ（図示無し）と、ステータ３が内側に圧入により固定されたモータハウジング２と、を備えている。そして、ステータ３において互いに隣り合うステータ分割体３０の連結部３０Ｊの外周面に、モータハウジング２の内周面２ｉとの干渉を避ける逃げ部５０が形成されている。逃げ部５０は、連結部３０Ｊの１箇所あたりの開き角θが、上記式（１）、式（２）を満たすように形成されている。 As described above, in the electric motor 1 described above, the stator 3 is formed by connecting the plurality of stator divisions 30 in the circumferential direction, and connecting the stator divisions 30 adjacent to each other, and is rotatable inward in the radial direction of the stator 3 And a motor housing 2 in which a stator 3 is fixed by press-fitting. Further, on the outer peripheral surface of the connecting portion 30J of the stator divided bodies 30 adjacent to each other in the stator 3, a relief portion 50 for avoiding interference with the inner peripheral surface 2i of the motor housing 2 is formed. The relief portion 50 is formed such that the opening angle θ per one location of the connecting portion 30J satisfies the above-described equations (1) and (2).
　このように、互いに隣り合うステータ分割体３０の連結部３０Ｊの外周面に逃げ部５０を形成することにより、モータハウジング２の内周面２ｉとの干渉を避けることができる。これにより、ステータ分割体３０の連結部３０Ｊに、モータハウジング２との干渉による圧縮応力が生じるのを抑えることができる。その結果、ステータ３に、部分的に磁束が流れにくい部位が生じるのを抑え、コギングトルクを抑えることができる。 Thus, interference with the inner circumferential surface 2i of the motor housing 2 can be avoided by forming the relief portion 50 on the outer circumferential surface of the connecting portion 30J of the stator divisions 30 adjacent to each other. Thereby, it is possible to suppress the occurrence of the compressive stress due to the interference with the motor housing 2 in the connecting portion 30J of the stator divided body 30. As a result, it is possible to suppress the cogging torque from being generated partially in the stator 3 at which the part where the magnetic flux hardly flows is generated.
　また、ステータ分割体３０同士の連結部３０Ｊは、ステータ３の周方向において複数個所に位置している。したがって、ステータ分割体３０同士の連結部３０Ｊの外周部に形成された逃げ部５０も、ステータ３の周方向において複数個所に位置する。
　このように、複数個所に形成された逃げ部５０を、連結部３０Ｊの１箇所あたりの開き角θが、上記式（１）、式（２）を満たすように形成することにより、モータハウジング２に対して圧入により固定されたステータ３が、モータハウジング２に確実に固定される。これにより、ステータ３に対してモータハウジング２が変位し、電動モータ１の作動音が生じてしまうのを抑えることができる。 The connecting portions 30 J of the stator divided bodies 30 are located at a plurality of locations in the circumferential direction of the stator 3. Therefore, the relief portions 50 formed on the outer peripheral portion of the connecting portion 30J of the stator divided bodies 30 are also located at a plurality of locations in the circumferential direction of the stator 3.
As described above, the motor housing 2 is formed by forming the relief portions 50 formed at a plurality of locations such that the opening angle θ per one location of the connection portion 30J satisfies the above formulas (1) and (2). The stator 3 is fixed to the motor housing 2 by press-fitting. As a result, the motor housing 2 is displaced with respect to the stator 3 and the generation of the operation noise of the electric motor 1 can be suppressed.
　また、電動モータ１は、周方向に９個所に逃げ部５０が形成されている。逃げ部５０は、１個所あたり、ステータ３の中心軸を中心として、５°～１４°の範囲に形成されている。
　このような構成によれば、互いに隣り合うステータ分割体３０同士の連結部３０Ｊにおいて、モータハウジング２との干渉による圧縮応力が生じるのを抑えつつ、ステータ３とモータハウジング２とを強固に固定することができる。よって、電動モータ１の作動音が生じてしまうのを、より確実に抑えることができる。 In the electric motor 1, relief portions 50 are formed at nine locations in the circumferential direction. The relief portion 50 is formed in a range of 5 ° to 14 ° with respect to the central axis of the stator 3 at one point.
According to such a configuration, the stator 3 and the motor housing 2 are firmly fixed while suppressing the generation of the compressive stress due to the interference with the motor housing 2 at the connecting portion 30J of the stator divided bodies 30 adjacent to each other. be able to. Therefore, generation of the operation noise of the electric motor 1 can be suppressed more reliably.
　また、電動モータ１は、逃げ部５０が、モータハウジング２の内周面２ｉ及び連結部３０Ｊの外周面の他方に対し、ステータ３の径方向において、モータハウジング２とステータ３との最大圧入代の２倍以上の寸法に設定された隙間を有して形成されている。
　このような構成によれば、互いに隣り合うステータ分割体３０同士の連結部３０Ｊにおいて、モータハウジング２との干渉を確実に避け、圧縮応力が生じるのを抑えることができる。 Further, in the electric motor 1, the clearance 50 is the maximum press-fit margin between the motor housing 2 and the stator 3 in the radial direction of the stator 3 with respect to the other of the inner peripheral surface 2 i of the motor housing 2 and the outer peripheral surface of the connecting portion 30 J It is formed with a gap set to a size of twice or more of.
According to such a configuration, it is possible to reliably avoid interference with the motor housing 2 and prevent the generation of compressive stress in the connecting portions 30J of the stator divided bodies 30 adjacent to each other.
　さらに、電動モータ１は、逃げ部５０が、ステータ３の外周面に形成され、モータハウジング２の内周面２ｉに対して径方向内側に間隔を隔てて位置する円弧状面５１ｆからなる凹溝５１であるようにした。
　このような構成によれば、ステータ３の外周面に逃げ部５０を形成することで、互いに隣り合うステータ分割体３０同士の連結部３０Ｊにおいて、モータハウジング２との干渉を確実に避け、圧縮応力が生じるのを抑えることができる。 Furthermore, in the electric motor 1, the relief portion 50 is formed on the outer peripheral surface of the stator 3 and is a recessed groove having an arc-shaped surface 51 f located radially inward with respect to the inner peripheral surface 2 i of the motor housing 2. It was made to be 51.
According to such a configuration, by forming the relief portion 50 on the outer peripheral surface of the stator 3, interference with the motor housing 2 is surely avoided in the connecting portion 30J of the stator divided bodies 30 adjacent to each other, and a compression stress is generated. Can be suppressed.
（第１の実施形態の第１変形例）
　次に、本発明にかかる電動モータ１の第１の実施形態の第１変形例について説明する。
　図１３は、第１の実施形態の第１変形例における電動モータ１を示す図である。
　同図に示すように、逃げ部５０Ｂは、ステータ３の外周面に形成され、モータハウジング２の内周面２ｉに対して径方向内側に間隔を隔てて位置する平面部５２からなるようにしてもよい。この平面部５２は、連結部３０Ｊにおいて互いに隣り合うステータ分割体３０の外周面側の端部３０ｅ，３０ｆ同士が突き当たる部分を、周方向の両側に跨がるように形成されている。 First Modification of First Embodiment
Next, a first modification of the first embodiment of the electric motor 1 according to the present invention will be described.
FIG. 13 is a view showing an electric motor 1 in a first modified example of the first embodiment.
As shown in the figure, the relief portion 50B is formed on the outer peripheral surface of the stator 3 so as to be composed of a flat portion 52 positioned radially inward with respect to the inner peripheral surface 2i of the motor housing 2. It is also good. The flat portion 52 is formed so that the end portions 30e and 30f on the outer peripheral surface side of the stator divided body 30 adjacent to each other in the connecting portion 30J abut on both sides in the circumferential direction.
　このような構成においても、上記第１の実施形態と同様、平面部５２からなる逃げ部５０Ｂを形成することにより、モータハウジング２にステータ３を確実に圧入固定して作動音を抑えることができる。また、周方向で互いに隣り合うステータ分割体３０同士の連結部３０Ｊで圧縮応力が生じるのを抑えて、コギングトルクを抑えることが可能となる。 Even in such a configuration, as in the first embodiment, by forming the relief portion 50B including the flat portion 52, the stator 3 can be securely press-fitted to the motor housing 2 and the operation noise can be suppressed. . In addition, it is possible to suppress the cogging torque by suppressing the generation of the compressive stress at the connecting portions 30J of the stator divided bodies 30 adjacent to each other in the circumferential direction.
（第１の実施形態の第２変形例）
　次に、本発明にかかる電動モータ１の第１の実施形態の第２変形例について説明する。
　図１４は、第１の実施形態の第２変形例における電動モータ１を示す図である。
　同図に示すように、逃げ部５０Ｃは、ステータ３の外周面に形成され、モータハウジング２の内周面２ｉに対して径方向内側に間隔を隔てて位置する平面部５２Ｂからなるようにしてもよい。この平面部５２Ｂは、連結部３０Ｊにおいて互いに隣り合うステータ分割体３０の外周面側の端部３０ｅ，３０ｆ同士が突き当たる部分を、周方向の両側に跨がるように形成されている。ただし、この平面部５２Ｂは、互いに隣り合うステータ分割体３０の外周面側の端部３０ｅ，３０ｆ同士が突き当たる部分に対し、周方向の一方の側にオフセットして形成されている。 Second Modification of First Embodiment
Next, a second modification of the first embodiment of the electric motor 1 according to the present invention will be described.
FIG. 14 is a view showing an electric motor 1 according to a second modification of the first embodiment.
As shown in the figure, the relief portion 50C is formed on the outer peripheral surface of the stator 3 so as to be composed of a flat portion 52B which is positioned radially inward with respect to the inner peripheral surface 2i of the motor housing 2. It is also good. The flat portion 52B is formed so that the end portions 30e and 30f on the outer peripheral surface side of the stator divided body 30 adjacent to each other in the connecting portion 30J abut on both sides in the circumferential direction. However, the flat portion 52B is formed offset to one side in the circumferential direction with respect to a portion where the end portions 30e and 30f on the outer peripheral surface side of the stator divided bodies 30 adjacent to each other abut each other.
　このような構成においても、上記実施形態と同様、平面部５２からなる逃げ部５０Ｃを形成することにより、モータハウジング２にステータ３を確実に圧入固定して作動音を抑えることができる。また、周方向で互いに隣り合うステータ分割体３０同士の連結部３０Ｊで圧縮応力が生じるのを抑えて、コギングトルクを抑えることが可能となる。 Also in such a configuration, as in the above embodiment, by forming the relief portion 50C including the flat portion 52, the stator 3 can be securely press-fitted to the motor housing 2 and the operation noise can be suppressed. In addition, it is possible to suppress the cogging torque by suppressing the generation of the compressive stress at the connecting portions 30J of the stator divided bodies 30 adjacent to each other in the circumferential direction.
（第１の実施形態の第３変形例）
　次に、本発明にかかる電動モータ１の第１の実施形態の第３変形例について説明する。
　図１５は、第１の実施形態の第３変形例における電動モータ１を示す図である。
　同図に示すように、逃げ部５０Ｄは、ステータ３の外周面に形成され、モータハウジング２の内周面２ｉに対して径方向内側に窪んで形成されたＶ字状の凹部５３Ａからなるようにしてもよい。この凹部５３Ａは、連結部３０Ｊにおいて互いに隣り合うステータ分割体３０の外周面側の端部３０ｅ，３０ｆ同士が突き当たる部分を、周方向の両側に跨がるように形成されている。 (Third Modification of First Embodiment)
Next, a third modification of the first embodiment of the electric motor 1 according to the present invention will be described.
FIG. 15 is a view showing an electric motor 1 according to a third modification of the first embodiment.
As shown in the figure, the relief portion 50D is formed on the outer peripheral surface of the stator 3 and includes a V-shaped recessed portion 53A formed so as to be recessed inward in the radial direction with respect to the inner peripheral surface 2i of the motor housing 2. You may The concave portion 53A is formed so as to straddle both sides in the circumferential direction in a portion where the end portions 30e and 30f of the outer peripheral surface side of the stator divided body 30 adjacent to each other in the connecting portion 30J abut each other.
　このような構成においても、上記第１の実施形態と同様、凹部５３Ａからなる逃げ部５０Ｄを形成することにより、モータハウジング２にステータ３を確実に圧入固定して作動音を抑えることができる。また、周方向で互いに隣り合うステータ分割体３０同士の連結部３０Ｊで圧縮応力が生じるのを抑えて、コギングトルクを抑えることが可能となる。 Also in such a configuration, as in the first embodiment, by forming the relief portion 50D including the recess portion 53A, the stator 3 can be securely press-fitted to the motor housing 2 to suppress the operation noise. In addition, it is possible to suppress the cogging torque by suppressing the generation of the compressive stress at the connecting portions 30J of the stator divided bodies 30 adjacent to each other in the circumferential direction.
（第１の実施形態の第４変形例）
　次に、本発明にかかる電動モータ１の第１の実施形態の第４変形例について説明する。
　図１６は、第１の実施形態の第４変形例における電動モータ１を示す図である。
　同図に示すように、逃げ部５０Ｅは、ステータ３の外周面に形成され、モータハウジング２の内周面２ｉに対して径方向内側に窪んで形成されたＵ字状の凹部５３Ｂからなるようにしてもよい。この凹部５３Ｂは、連結部３０Ｊにおいて互いに隣り合うステータ分割体３０の外周面側の端部３０ｅ，３０ｆ同士が突き当たる部分を、周方向の両側に跨がるように形成されている。 (Fourth Modification of the First Embodiment)
Next, a fourth modification of the first embodiment of the electric motor 1 according to the present invention will be described.
FIG. 16 is a view showing an electric motor 1 according to a fourth modification of the first embodiment.
As shown in the figure, the relief portion 50E is formed of a U-shaped recess 53B formed on the outer peripheral surface of the stator 3 and recessed inward in the radial direction with respect to the inner peripheral surface 2i of the motor housing 2. You may The recessed portion 53B is formed so as to straddle both sides in the circumferential direction in a portion where the end portions 30e and 30f of the outer peripheral surface side of the stator divided body 30 adjacent to each other in the connecting portion 30J abut each other.
　このような構成においても、上記第１の実施形態と同様、凹部５３Ｂからなる逃げ部５０Ｅを形成することにより、モータハウジング２にステータ３を確実に圧入固定して作動音を抑えることができる。また、周方向で互いに隣り合うステータ分割体３０同士の連結部３０Ｊで圧縮応力が生じるのを抑えて、コギングトルクを抑えることが可能となる。 Also in such a configuration, as in the first embodiment, by forming the relief portion 50E including the recess portion 53B, the stator 3 can be securely press-fitted to the motor housing 2 and the operation noise can be suppressed. In addition, it is possible to suppress the cogging torque by suppressing the generation of the compressive stress at the connecting portions 30J of the stator divided bodies 30 adjacent to each other in the circumferential direction.
（第２の実施形態）
　次に、本発明にかかる電動モータ１Ｆの第２の実施形態について説明する。
　図１７は、第２の実施形態における電動モータ１Ｆを構成するステータ分割体３０同士の連結部３０Ｊを示す要部拡大図である。
　同図に示すように、電動モータ１Ｆは、モータハウジング２Ｆと、モータハウジング２Ｆ内に収納されている略円筒状のステータ３Ｆと、ステータ３Ｆの径方向内側に設けられ、ステータ３に対して回転可能に設けられたロータ（図示無し）と、を備えている。
　この第２の実施形態において、ステータ３Ｆの外周面３ｇには、逃げ部は形成されていない。 Second Embodiment
Next, a second embodiment of the electric motor 1F according to the present invention will be described.
FIG. 17 is an enlarged view of an essential part showing a connecting part 30J of the stator divided bodies 30 constituting the electric motor 1F in the second embodiment.
As shown in the figure, the electric motor 1F is provided radially inward of the motor housing 2F, the substantially cylindrical stator 3F housed in the motor housing 2F, and the stator 3F, and rotates relative to the stator 3 And a rotor (not shown) provided possible.
In the second embodiment, no relief is formed on the outer peripheral surface 3g of the stator 3F.
　逃げ部５０Ｆは、モータハウジング２Ｆの内周面２ｉに形成され、ステータ３の外周面に対して径方向外側に間隔を隔てて位置する円弧状面５４ｆを有したハウジング側凹溝５４からなる。このハウジング側凹溝５４は、連結部３０Ｊにおいて互いに隣り合うステータ分割体３０の外周面側の端部３０ｅ，３０ｆ同士が突き当たる部分に対向する位置を、周方向の両側に跨がるように形成されている。
　このような逃げ部５０Ｆは、ステータ３Ｆで互いに隣り合うステータ分割体３０同士の連結部３０Ｊにおいて、ステータ３Ｆの外周面３ｆとモータハウジング２Ｆとの干渉を避ける。 The relief portion 50F is formed on the inner peripheral surface 2i of the motor housing 2F, and comprises a housing side recessed groove 54 having an arc-shaped surface 54f spaced apart from the outer peripheral surface of the stator 3 radially outward. The housing-side recessed groove 54 is formed so as to straddle both sides in the circumferential direction at a position opposed to a portion where the end portions 30e and 30f of the outer peripheral surface side of the stator divided body 30 adjacent to each other abut in the connecting portion 30J. It is done.
Such a relief portion 50F avoids the interference between the motor housing 2F and the outer peripheral surface 3f of the stator 3F in the connecting portion 30J of the stator divided bodies 30 adjacent to each other in the stator 3F.
　このような構成においても、上記第１の実施形態と同様、ハウジング側凹溝５４からなる逃げ部５０Ｆを形成することで、ステータ分割体３０の連結部３０Ｊに、モータハウジング２Ｆとの干渉による圧縮応力が生じるのを抑えることができる。 Also in such a configuration, as in the first embodiment, by forming the relief portion 50F including the housing-side recessed groove 54, the coupling portion 30J of the stator divided body 30 is compressed due to interference with the motor housing 2F. Stress can be suppressed.
　図１８は、上記第２の実施形態で示した逃げ部５０Ｆを備えるステータ３Ｆとモータハウジング２Ｆとに生じる圧縮応力の分布を、シミュレーション解析により得た結果を示す図である。
　同図に示すように、逃げ部５０Ｆを備えるモータハウジング２Ｆの場合、ステータ３Ｆで互いに隣り合うステータ分割体３０の連結部３０Ｊにおいて、高い圧縮応力は生じていないことが確認できる。 FIG. 18 is a diagram showing the results of simulation analysis of the distribution of the compressive stress generated in the stator 3F having the relief portion 50F shown in the second embodiment and the motor housing 2F.
As shown in the figure, in the case of the motor housing 2F provided with the relief portion 50F, it can be confirmed that high compressive stress is not generated in the connecting portion 30J of the stator divisions 30 adjacent to each other in the stator 3F.
　図１９は、上記第２の実施形態で示した逃げ部５０Ｆを備えるステータ３Ｆとモータハウジング２ＦＲとにおける磁束密度の分布を、シミュレーション解析により得た結果を示す図である。
　同図に示すように、逃げ部５０Ｆを備えるモータハウジング２Ｆの場合、ステータ３Ｆで互いに隣り合うステータ分割体３０の連結部３０Ｊにおいて、磁束密度が低い部分によって磁束の流れが阻害される部分が減少する。そして、磁束が周方向で連続的に流れていることが確認できる。 FIG. 19 is a diagram showing the results of simulation analysis of the magnetic flux density distribution in the motor housing 2FR and the stator 3F including the relief 50F described in the second embodiment.
As shown in the figure, in the case of the motor housing 2F having the relief portion 50F, in the connecting portion 30J of the stator divisions 30 adjacent to each other in the stator 3F, the portion where the flow of the magnetic flux is blocked by the portion having a low magnetic flux density is reduced. Do. Then, it can be confirmed that the magnetic flux flows continuously in the circumferential direction.
　また、周方向複数個所に形成された逃げ部５０Ｆを、連結部３０Ｊの１箇所あたりの開き角θが、上記式（１）、式（２）を満たすように形成することにより、ステータ３に対してモータハウジング２が変位する。この結果、電動モータ１Ｆの作動音が生じてしまうのを抑えることができる。
　したがって、モータハウジング２Ｆにステータ３Ｆを確実に圧入固定して作動音を抑えることができる。また、周方向で互いに隣り合う分割コア３０同士の連結部３０Ｊで圧縮応力が生じるのを抑えて、コギングトルクを抑えることが可能となる。 Further, in the stator 3, the relief portions 50 F formed at a plurality of circumferential positions are formed such that the opening angle θ per one position of the connection portion 30 J satisfies the above formulas (1) and (2). In contrast, the motor housing 2 is displaced. As a result, it is possible to suppress the occurrence of the operation noise of the electric motor 1F.
Therefore, the stator 3F can be securely press-fitted and fixed to the motor housing 2F to suppress the operation noise. In addition, it is possible to suppress the cogging torque by suppressing the generation of the compressive stress at the connecting portion 30J of the divided cores 30 adjacent to each other in the circumferential direction.
（その他の実施形態）
　なお、本発明は上述の各実施形態およびその変形例に限られるものではなく、本発明の趣旨を逸脱しない範囲において、上述の実施形態に種々の変更を加えたものを含む。 (Other embodiments)
The present invention is not limited to the above-described embodiments and the modifications thereof, and includes various modifications of the above-described embodiments without departing from the spirit of the present invention.
　例えば、上記実施形態において、電動モータ１，１Ｆの各部の構成について説明した。しかしながら、これに限られるものではなく、その詳細な構成については、適宜変更することが可能である。
　また、ステータ３，３Ｆを構成するステータ分割体３０の数を９個とした場合について説明した。しかしながら、これに限られるものではなく、ステータ分割体３０の個数について適宜変更可能である。例えば、ステータ分割体３０の個数を１２個等としてもよい。 For example, in the above-mentioned embodiment, composition of each part of electric motors 1 and 1F was explained. However, the present invention is not limited to this, and the detailed configuration thereof can be changed as appropriate.
Moreover, the case where the number of the stator division bodies 30 which comprise the stators 3 and 3F was nine was demonstrated. However, the present invention is not limited to this, and the number of stator divisions 30 can be appropriately changed. For example, the number of stator divisions 30 may be twelve or the like.
　また、上記実施形態では、電動モータ１，１Ｆを、電動パワーステアリング等に用いるものとしたが、その用途については何ら限定するものではない。さらに、電動モータ１，１Ｆに、減速機部を一体に備えた構成とすることも可能である。
　これ以外にも、本発明の主旨を逸脱しない限り、上記実施の形態で挙げた構成を取捨選択したり、他の構成に適宜変更したりすることが可能である。 In the above embodiment, the electric motors 1 and 1F are used for the electric power steering and the like, but the application thereof is not limited at all. Furthermore, the electric motors 1 and 1F may be integrally provided with a reduction gear unit.
In addition to this, it is possible to select the configuration described in the above embodiment or to appropriately change it to another configuration without departing from the spirit of the present invention.
　１、１Ｆ…電動モータ
　２…モータハウジング
　２ｉ…内周面
　３、３Ｆ…ステータ
　４…ロータ
　３０…ステータ分割体
　３０Ｊ…連結部
　５０、５０Ｂ、５０Ｃ、５０Ｄ、５０Ｅ、５０Ｆ…逃げ部
　５１…凹溝
　５１ｆ…円弧状面
　５２、５２Ｂ…平面部
　５３Ａ、５３Ｂ…凹部
　５４…ハウジング側凹溝
　５４ｆ…円弧状面 DESCRIPTION OF SYMBOLS 1, 1F ... Electric motor 2 ... Motor housing 2i ... Inner peripheral surface 3, 3F ... Stator 4 ... Rotor 30 ... Stator division body 30J ... Connection part 50, 50B, 50C, 50D, 50E, 50F ... Relief part 51 ... Concave groove 51f ... arc-shaped surface 52, 52B ... flat portion 53A, 53B ... recess 54 ... housing-side recessed groove 54f ... arc-shaped surface

Claims (7)

  1. 　周方向に複数のステータ分割体が配置され、互いに隣り合う前記ステータ分割体同士を連結してなるステータと、
    　前記ステータが内側に圧入により固定されたモータハウジングと、を備え、
    　前記モータハウジングの内周面、及び前記ステータにおいて互いに隣り合う前記ステータ分割体の連結部の外周面の少なくとも何れか一方に、前記モータハウジングの内周面及び前記連結部の外周面の他方との干渉を避ける逃げ部が形成され、
    　前記逃げ部は、前記連結部１箇所あたりの前記ステータの中心軸を中心とした周方向の角度をθとし、前記ステータ分割体の個数をＸとし、係数をＫとしたとき、角度θ、個数Ｘ、及び係数Ｋが、
    　θ＝（３６０÷Ｘ）×Ｋ
    　０．１２５≦Ｋ≦０．３７５
    を満たすように形成されていることを特徴とする電動モータ。     A stator in which a plurality of stator divisions are disposed in the circumferential direction, and the stator divisions adjacent to each other are connected to each other;
    A motor housing in which the stator is fixed by press fitting inside;
    At least one of the inner peripheral surface of the motor housing and the outer peripheral surface of the connecting portion of the stator divisions adjacent to each other in the stator with the other of the inner peripheral surface of the motor housing and the outer peripheral surface of the connecting portion A relief is formed to avoid interference,
    When the angle of the circumferential direction around the central axis of the stator per connecting part is θ, the number of the stator divisions is X, and the coefficient is K, the clearance θ is the number θ X and the coefficient K are
    θ = (360 ÷ X) × K
    0.125 ≦ K ≦ 0.375
    An electric motor characterized in that it is formed to satisfy the following conditions.
  2. 　前記ステータ分割体を９個有し、
    　周方向に９個所に前記逃げ部が形成され、
    　前記逃げ部は、１個所あたり、前記ステータの中心軸を中心として、５～１４°の範囲に形成されている
    ことを特徴とする請求項１に記載の電動モータ。     There are nine said stator divisions,
    The relief portion is formed at nine places in the circumferential direction,
    The electric motor according to claim 1, wherein the relief portion is formed in a range of 5 to 14 ° around one center of the central axis of the stator.
  3. 　前記逃げ部は、前記モータハウジングの内周面及び前記連結部の外周面の他方に対し、前記ステータの径方向において、前記ステータの直径の０．２％以上の寸法に設定された隙間を有して形成されていることを特徴とする請求項１または請求項２に記載の電動モータ。 The relief portion has a clearance set to 0.2% or more of the diameter of the stator in the radial direction of the stator with respect to the other of the inner peripheral surface of the motor housing and the outer peripheral surface of the connecting portion. The electric motor according to claim 1, wherein the electric motor is formed.
  4. 　前記逃げ部は、前記ステータの外周面に形成され、前記モータハウジングの内周面に対して径方向内側に間隔を隔てて位置する円弧状面からなる
    ことを特徴とする請求項１～請求項３の何れか１項に記載の電動モータ。     The relief portion is formed on an outer peripheral surface of the stator, and is formed of an arc-shaped surface located radially inward with respect to the inner peripheral surface of the motor housing. The electric motor according to any one of 3.
  5. 　前記逃げ部は、前記ステータの外周面に形成され、前記モータハウジングの内周面に対して径方向内側に間隔を隔てて位置する平面部からなる
    ことを特徴とする請求項１～請求項３の何れか１項に記載の電動モータ。     4. The flat surface portion according to claim 1, wherein the relief portion is formed on an outer peripheral surface of the stator and is spaced apart radially inward from an inner peripheral surface of the motor housing. The electric motor according to any one of the above.
  6. 　前記逃げ部は、前記ステータの外周面に形成され、前記モータハウジングの内周面に対して径方向内側に窪んで形成されたＶ字状又はＵ字状の凹部からなる
    ことを特徴とする請求項１～請求項３の何れか１項に記載の電動モータ。     The relief portion is a V-shaped or U-shaped concave portion formed on an outer peripheral surface of the stator and recessed inward in a radial direction with respect to an inner peripheral surface of the motor housing. An electric motor according to any one of claims 1 to 3.
  7. 　前記逃げ部は、前記モータハウジングの内周面に形成され、前記ステータの外周面に対して径方向外側に間隔を隔てて位置する円弧状面からなる
    ことを特徴とする請求項１～請求項３の何れか１項に記載の電動モータ。     The relief portion is formed on an inner peripheral surface of the motor housing, and is formed of an arc-shaped surface located radially outward with respect to the outer peripheral surface of the stator. The electric motor according to any one of 3.
PCT/JP2018/030954 2017-09-04 2018-08-22 Electric motor WO2019044612A1 (en)

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JPH11252842A (en) * 1998-02-27 1999-09-17 Hitachi Ltd Molded coil element, its manufacture, core, its manufacture and dynamoelectric machine
JP2001238376A (en) * 2000-02-21 2001-08-31 Mitsubishi Electric Corp Motor stator core
JP2009177907A (en) * 2008-01-23 2009-08-06 Yaskawa Electric Corp Stator of rotary electric machine, and rotary electric machine with the same
JP2015156756A (en) * 2014-02-20 2015-08-27 三菱電機株式会社 Single phase induction motor, sealed compressor and refrigeration cycle system
WO2017145332A1 (en) * 2016-02-25 2017-08-31 株式会社安川電機 Rotary electric machine and method for manufacturing rotary electric machine

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11252842A (en) * 1998-02-27 1999-09-17 Hitachi Ltd Molded coil element, its manufacture, core, its manufacture and dynamoelectric machine
JP2001238376A (en) * 2000-02-21 2001-08-31 Mitsubishi Electric Corp Motor stator core
JP2009177907A (en) * 2008-01-23 2009-08-06 Yaskawa Electric Corp Stator of rotary electric machine, and rotary electric machine with the same
JP2015156756A (en) * 2014-02-20 2015-08-27 三菱電機株式会社 Single phase induction motor, sealed compressor and refrigeration cycle system
WO2017145332A1 (en) * 2016-02-25 2017-08-31 株式会社安川電機 Rotary electric machine and method for manufacturing rotary electric machine

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