WO2013154054A1 - ブラシレスモータ - Google Patents

ブラシレスモータ Download PDF

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Publication number
WO2013154054A1
WO2013154054A1 PCT/JP2013/060522 JP2013060522W WO2013154054A1 WO 2013154054 A1 WO2013154054 A1 WO 2013154054A1 JP 2013060522 W JP2013060522 W JP 2013060522W WO 2013154054 A1 WO2013154054 A1 WO 2013154054A1
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WO
WIPO (PCT)
Prior art keywords
bus bar
phase
coil
brushless motor
main body
Prior art date
Application number
PCT/JP2013/060522
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
淳 宮木
純 近藤
山本　勉
茂広 米田
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
Priority to CN201380017893.4A priority Critical patent/CN104205579B8/zh
Publication of WO2013154054A1 publication Critical patent/WO2013154054A1/ja

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/46—Fastening of windings on the stator or rotor structure
    • H02K3/52—Fastening salient pole windings or connections thereto
    • H02K3/521—Fastening salient pole windings or connections thereto applicable to stators only
    • H02K3/522—Fastening salient pole windings or connections thereto applicable to stators only for generally annular cores with salient poles
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K2203/00—Specific aspects not provided for in the other groups of this subclass relating to the windings
    • H02K2203/09—Machines characterised by wiring elements other than wires, e.g. bus rings, for connecting the winding terminations

Definitions

  • the present invention relates to a brushless motor used in, for example, a motorcycle.
  • This application claims priority based on Japanese Patent Application No. 2012-092148 for which it applied to Japan on April 13, 2012, and uses the content here.
  • an inner rotor type brushless motor has a stator that is fitted and fixed to a motor case, and a rotor that is disposed at the center in the radial direction of the motor case and is rotatably supported with respect to the stator.
  • a plurality of permanent magnets are provided on the outer peripheral surface of the rotor.
  • the stator includes a substantially cylindrical stator core and a plurality of teeth projecting radially inward from the stator core.
  • Each tooth is provided with a resin insulator, which is an electrically insulating material, and a coil is wound through the insulator.
  • a resin insulator which is an electrically insulating material
  • a coil is wound through the insulator.
  • a means for supplying power to the coil a state in which a plurality of metal bus bars are electrically insulated from each other in a resin mold body formed in a substantially annular shape in order to reduce the size and improve the assemblability.
  • a bus bar unit embedded in (1) is used.
  • the bus bar unit described in Patent Document 1 is laminated in such a state that a flat-phase bus bar (three phases of U phase, V phase, and W phase) and a neutral point bus bar are separated in the axial direction. Molded by the body.
  • the outer peripheral surface of the resin mold body is integrally formed with a leg portion protruding toward the stator core side, while the insulator is formed with a concave portion capable of fitting the leg portion at a portion corresponding to the leg portion. .
  • the bus bar unit is fixed by stacking the bus bar unit on the insulator so that the leg portion is fitted in the recess.
  • each phase terminal projecting from each phase bus bar and each neutral point terminal projecting from the neutral point bus bar are directed radially outward from the outer peripheral surface of the resin mold body. And projecting radially.
  • Each phase terminal is connected to the winding start end of each phase coil, while the neutral point terminal is connected to the winding end of each phase coil.
  • each phase coil is connected by what is called a star connection system.
  • the present invention has been made in view of the above-described circumstances, and provides a brushless motor that can be reduced in size.
  • a brushless motor includes a stator core, a rotor that is disposed radially inside the stator core, and is rotatably supported with respect to the stator core, and the stator core via an insulator.
  • a plurality of wound coils of a phase are provided with a ring-shaped bus bar unit for supplying power.
  • the bus bar unit is provided for each phase, and includes a plurality of curved phase bus bars having phase terminals connected to one end of the coil, and a ring-shaped bus bar made of an insulating member that holds the plurality of phase bus bars.
  • a holder. The diameter of the inner peripheral surface of the bus bar holder was set to be larger than the diameter of the outer peripheral surface of the insulator, and the bus bar unit was arranged on the outer side in the radial direction than the insulator.
  • an insulator and a bus-bar unit can be wrapped in an axial direction. For this reason, the height from the stator core to the bus bar unit can be suppressed correspondingly, and as a result, the axial length of the brushless motor can be shortened, and the brushless motor can be miniaturized.
  • the bus bar unit is disposed on the radially outer side of the insulator, it is easy to secure a space above the stator core in the axial direction, and the heat dissipation effect of the heat generated by the coil can be enhanced. For this reason, the temperature rise of a brushless motor can be suppressed and it becomes possible to raise the motor efficiency of a brushless motor.
  • the plurality of phase bus bars are formed by curving the thickness direction of the strip-shaped metal plate, and the respective phase bus bars are arranged side by side in the radial direction. At least one of the bus bars for each phase is formed such that the radius of curvature changes from the middle in the circumferential direction.
  • the bus bar holder has a holder body formed in a ring shape.
  • a plurality of grooves into which the plurality of phase bus bars can be inserted from one side in the axial direction are formed in the holder body side by side in the radial direction. At least a part of the opening edge of each groove is formed with a retaining claw for preventing the plurality of phase bus bars from coming off.
  • the two coils are wound around the teeth of the stator core so as to form a parallel circuit.
  • the total resistance of the coil wound around each tooth can be suppressed while reducing the wire diameter of the coil. For this reason, winding work can be facilitated as much as the diameter of the coil can be reduced.
  • the bus bar unit includes a grommet, and the grommet is formed from one plane of the grommet, and has a gasket circulation hole for injecting a liquid sealing material, and the other grommet. And a gasket retaining groove that is formed over the entire area and communicates with the gasket circulation hole.
  • the insulator and the bus bar unit can be wrapped in the axial direction. For this reason, the height from the stator core to the bus bar unit can be suppressed correspondingly, and as a result, the axial length of the brushless motor can be shortened, and the brushless motor can be miniaturized.
  • FIG. 1 is a cross-sectional view including the central axis O of the brushless motor 1.
  • a brushless motor 1 is used in, for example, an electric motorcycle, and is provided so as to be rotatable with respect to a stator 3 press-fitted into a bottomed cylindrical stator housing 2 and the stator 3.
  • a boss 2c that protrudes outward in the axial direction is formed at the center in the radial direction on the bottom 2b of the stator housing 2, and a bearing 5 is press-fitted therein.
  • the bearing 5 is for rotatably supporting the rotating shaft 6 of the rotor 4.
  • the opening side (left side in FIG. 1) of the stator housing 2 may be described as one side in the axial direction
  • the bottom 2b side (right side in FIG. 1) may be described as the other side in the axial direction.
  • FIG. 2 is a plan view of the brushless motor 1 with the bracket 7 removed
  • FIG. 3 is a plan view of the split core 61.
  • the stator 3 has a substantially cylindrical stator core 10, and the outer peripheral surface of the stator core 10 is press-fitted into the inner peripheral surface of the cylindrical portion 2 d of the stator housing 2.
  • the stator core 10 uses a split core system that can be split in the circumferential direction.
  • the divided core 61 divided from the stator core 10 is formed by, for example, laminating a plurality of plate materials made of a magnetic material in the axial direction, and has a core body 62 extending in the circumferential direction.
  • the core body 62 is a portion that forms an annular magnetic path of the stator core 10 and is a portion that is fitted into the inner peripheral surface of the stator housing 2, and is formed in a substantially arc shape in an axial plan view. .
  • Both end portions in the circumferential direction of the core body 62 are connection portions 63a and 63b that are connected to the other core body 62 by press-fitting.
  • One connecting portion 63a has a convex shape
  • the other connecting portion 63b has a concave shape that can receive one connecting portion 63a.
  • a tooth portion 64 is integrally extended from the substantially central portion in the circumferential direction toward the center of rotation so as to extend along the radial direction.
  • Each tooth portion 64 is formed in a substantially T shape in a plan view in the axial direction, and includes a winding drum portion 65a extending in the radial direction and an inner peripheral portion 65b extending in the circumferential direction.
  • a coil 12 is wound around the winding body 65a via an insulator 11.
  • the insulator 11 is an insulating material for insulation between the tooth portion 64 and the coil 12.
  • the insulator 11 is formed to rise from a base portion 11a that covers the outer peripheral surface of the winding drum portion 65a, an inner peripheral wall portion 11b that rises from a radially inner edge of the base portion 11a, and a radially outer edge of the base portion 11a.
  • the outer peripheral wall portion 11c is integrally formed.
  • the coil 12 is wound so as to be housed in a concave coil housing portion 11d formed by the base portion 11a, the inner peripheral wall portion 11b, and the outer peripheral wall portion 11c.
  • each tooth portion 64 is assigned three phases of U phase, V phase, and W phase so that two teeth portions 64 adjacent in the circumferential direction are in phase, and the coil 12 is wound. It corresponds to the phase of the tooth portion 64 that is made. That is, the brushless motor 1 of this embodiment is a three-phase brushless motor including three-phase coils 12 of a U phase, a V phase, and a W phase.
  • the brushless motor 1 of this embodiment employs so-called double winding in which two coils 12 are wound around each tooth portion 64 and the ends of the two coils 12 are connected to each other. This double winding method will be described in detail below.
  • (Coil winding method) 4 and 5 are explanatory views showing a method of winding the coil 12 around the tooth portion 64 of each divided core 61, and are perspective views of the divided core 61.
  • the number of turns of the coil 12 to each tooth portion 64 is 28 times. That is, as shown in FIG. 3, the coil 12 passes 28 times on one side in the radial direction of the tooth portion 64, in other words, the coil 12 passes 56 times in total on both radial sides of the tooth portion 64. become.
  • numbers are assigned to the coils 12 that pass through both radial side surfaces of the tooth portion 64.
  • the loop portion 12a is formed in the coil 12 in the middle of winding around the tooth portion 64 (between the 28th and 29th times in the present embodiment), and then the loop portion 12a is cut, thereby forming the teeth. While the coil 12 is continuously wound around the portion 64, double winding can be performed. That is, the first to 28th coils 12 become the first (first layer) coil 12 (see X1 in FIG. 3), and the 29th to 56th coils 12 are the second (second layer). The coil 12 is obtained (see the X2 part in FIG. 3).
  • the rotor 4 includes a rotating shaft 6, a rotor core 41 that is fitted and fixed to the rotating shaft 6, and a magnet 13 that is disposed in the rotor core 41 along the circumferential direction.
  • the rotating shaft 6 is rotatably supported at both ends by a bearing 5 provided on the bottom 2 b of the stator housing 2 and a bearing 21 provided on the bracket 7.
  • the rotor core 41 is formed by laminating a plurality of electromagnetic steel plates formed in a substantially disc shape along the central axis O, and has a press-fit hole 43 into which the rotary shaft 6 can be press-fitted in the center in the radial direction. Is formed. Further, the axial length of the rotor core 41 is set to be substantially the same as the axial length of the stator core 10. Further, a plurality of slits 44 penetrating in the axial direction are formed in the outer circumferential portion of the rotor core 41 at equal intervals in the circumferential direction. In these slits 44, the magnet 13 is inserted and fixed.
  • the magnet 13 is a permanent magnet made of segmented neodymium or the like formed in a block shape, and is arranged in the slit 44 so that the magnetic poles change in the circumferential direction in order.
  • the length of the magnet 13 in the axial direction is set to substantially match the length of the rotor core 41 in the axial direction.
  • the brushless motor 1 generates a magnetic field in the stator core 10 by supplying current supplied from an external power source to the coils 12 of each phase via the bus bar unit 50. ing.
  • the rotor 4 is rotated by the attractive force and the repulsive force between the magnetic field and the magnet 13.
  • FIG. 6 is a plan view of the bus bar unit 50.
  • the front side of the drawing is the one side (left side in FIG. 1) of the stator housing 2.
  • the bus bar unit 50 connects the coils 12 of each phase by a so-called star connection method, and electrically connects the coils 12 of each phase and an external power source (not shown). belongs to.
  • the bus bar unit 50 is formed in a substantially ring shape, and is disposed coaxially with the stator core 10 on one side of the stator core 10.
  • the bus bar unit 50 includes each phase bus bar (U-phase bus bar 30U, V-phase bus bar 30V, W-phase bus bar 30W) connected to one terminal portion of each phase coil 12. ), And the neutral point bus bar 30N connected to the other terminal portion of the coil 12 of each phase, and the phase bus bars 30U, 30V, 30W and the neutral point bus bar 30N are arranged side by side in the radial direction. And a bus bar holder 51 that holds the head in a state where it is in contact.
  • FIG. 7 is a plan view of the U-phase bus bar 30U.
  • the U-phase bus bar 30U is obtained by stamping a strip-shaped metal plate made of copper or the like by pressing or the like, and is curved so that the thickness direction thereof follows the opening 2a of the stator housing 2.
  • the bus bar main body 31U is formed in a substantially arc shape.
  • the bus bar main body 31U is curved so as to have a substantially semicircular shape, and its radius of curvature changes with the substantially center in the extending direction as a boundary. That is, the bus bar main body 31U is formed by continuously forming a first main body 131U having a radius of curvature R1 and a second main body 231U having a radius of curvature R2.
  • the radius of curvature R1 and the radius of curvature R2 are R1> R2 (1) It is set to satisfy.
  • U-phase terminals 35U are formed in the bus bar main body 31U at positions corresponding to the two locations from which the terminal portions of the U-phase coil 12 are drawn, respectively. That is, one U-phase terminal 35U is formed on one end side of the first main body 131U of the bus bar main body 31U and one end side of the second main body 231U.
  • the U-phase terminal 35U is for connecting the U-phase bus bar 30U and the terminal portion of the U-phase coil 12.
  • the U-phase terminal 35U is integrally formed with a tongue piece portion 36U that is bent from one axial side of the bus bar main body 31U toward the inside in the radial direction, and a coil holding portion 37U provided at the tip of the tongue piece portion 36U. Has been.
  • the coil holding portion 37U is formed in a substantially U shape so that the terminal portion of the U-phase coil 12 can be fixed by caulking.
  • maintenance part 37U is arrange
  • the coil holding part 37U and the terminal part of the coil 12 may be welded to further strengthen the connection between the two parts 37U and 12. it can.
  • a power feeding portion 39U that is bent and extended from one axial side toward the radially outer side is integrally formed at one end of the first main body 131U of the bus bar main body 31U.
  • the power feeding unit 39U is electrically connected to the terminal 23 (see FIG. 1).
  • the terminal 23 is connected to an external power supply (not shown) so that the current of the external power supply can be supplied to the U-phase bus bar 30U.
  • FIG. 8 is a plan view of the V-phase bus bar 30V.
  • the V-phase bus bar 30V has a bus bar body 31V that is curved so as to have a substantially semicircular shape.
  • the bus bar body 31V has a radius of curvature that is substantially in the center in the extending direction.
  • the first main body 131V and the second main body 231V are formed continuously, and the first main body 131V so as to correspond to the position where the terminal portion of the V-phase coil 12 is pulled out.
  • the basic configuration such as the point that one V-phase terminal 35V is formed for each of the second main bodies 231V, and the power feeding portion 39V that connects the terminal 23 to the bus bar main body 31V, are integrally formed. It is the same as U-phase bus bar 30U (the same applies to W-phase bus bar 30W below).
  • the difference between the V-phase bus bar 30V and the U-phase bus bar 30U is that the curvature radius of the bus bar body 31V in the V-phase bus bar 30V is different from the curvature radius of the bus bar body 31U in the U-phase bus bar 30U.
  • the position of the power feeding unit 39V with respect to the bus bar main body 31V and the position of the power feeding unit 39U with respect to the bus bar main body 31U are different (the same applies to the W-phase bus bar 30W below).
  • the curvature radius of the first body 131V is set to R3, while the curvature radius of the second body 231V is set to R4.
  • the curvature radius R3 and the curvature radius R4 are R2 ⁇ R3 ⁇ R4 (2) It is set to satisfy.
  • the power feeding portion 39V integrally formed with the bus bar main body 31V is disposed so as to be adjacent to the power feeding portion 39U of the U-phase bus bar 30U and at the substantially center in the extending direction of the bus bar main body 31V.
  • the power feeding unit 39V is disposed in the vicinity of the connection portion between the first main body 131V and the second main body 231V.
  • FIG. 9 is a plan view of the W-phase bus bar 30W.
  • the radius of curvature of the first main body 131W constituting one of the bus bar main bodies 31W of the W-phase bus bar 30W is set to R5.
  • the radius of curvature of the second main body 231W constituting the other side of the bus bar main body 31W is set to R6.
  • these curvature radius R5 and curvature radius R6 are: R1 ⁇ R5 ⁇ R6 (3) It is set to satisfy.
  • the two W-phase terminals 35W are provided on one end side of the first main body 131W and one end side of the second main body 231W, respectively. Furthermore, the power feeding unit 39W is disposed at one end of the first main body 131W.
  • each phase bus bar 30U, 30V, 30W has a connection bus bar 30J for connecting in series the coils 12 of the same phase adjacent in the circumferential direction.
  • FIG. 10 is a plan view of the connecting bus bar 30J.
  • the basic configuration of the connection bus bar 30J is the same as that of the above-described phase bus bars 30U, 30V, 30W. That is, the connecting bus bar 30J has a bus bar main body 31J formed by continuously forming a first main body 131J and a second main body 231J.
  • the bus bar main body 31J extends so as to straddle the terminal portions on the side where the adjacent in-phase coils 12 are connected in series.
  • the radius of curvature of the first main body 131J is set to R7, while the radius of curvature of the second main body 231J is set to R8. And these curvature radius R7 and curvature radius R8 are: R7 ⁇ R8 (4) And the size is set so as not to interfere with the bus bar main bodies 31U, 31V, 31W in a state where the bus bars for the phases 30U, 30V, 30W are arranged in the radial direction.
  • connection terminals 35J are formed at both ends of the bus bar main body 31J in the extending direction, that is, at one end of the first main body 131J and one end of the second main body 231J, respectively.
  • connection terminal 35J is the same as that of the phase terminals 35U, 35V, and 35W, detailed description thereof is omitted.
  • FIG. 11 is a perspective view of the neutral point bus bar 30N.
  • the neutral point bus bar 30N is formed by punching a band-shaped metal plate made of copper or the like by pressing or the like, as with each phase bus bar 30U, 30V, 30W.
  • the bus bar main body 31N is formed in a substantially annular shape with a curved direction.
  • the radius R9 of the bus bar body 31N is R7 ⁇ R9 (5) R8 ⁇ R9 (6) It is set to satisfy.
  • neutral point terminals 35N are formed in the bus bar main body 31N at positions corresponding to the terminal portions on the side connected as the neutral points of the coils 12 of the respective phases. That is, in this embodiment, six neutral point terminals 35N are formed on the bus bar main body 31N.
  • the configuration of the neutral point terminal 35N is the same as that of the phase terminals 35U, 35V, and 35W, detailed description thereof is omitted.
  • bus bar holder 51 Next, the bus bar holder 51 will be described with reference to FIGS. 1, 6, 12, and 13. 12 is an enlarged perspective view of a portion A in FIG. 6, and FIG. 13 is a plan view of the portion A in FIG. 6 as viewed from the back side. As shown in FIGS. 1 and 6, the bus bar holder 51 has a holder main body 52 that can accommodate the bus bars 30U, 30V, 30W for each phase including the connection bus bar J and the bus bar 30N for the neutral point. .
  • the holder body 52 is formed in a substantially ring shape by an insulating member such as resin.
  • the bus bar main bodies 31U, 31V, 31W, 31J, 31N of the respective phase bus bars 30U, 30V, 30W including the connection bus bar 30J and the neutral point bus bar 30N are inserted from one side in the axial direction.
  • Possible groove portions 53U, 53V, 53W, 53J, 53N are formed. That is, each of the groove portions 53U, 53V, 53W, 53J, and 53N is formed so as to open on one side in the axial direction.
  • a pedestal portion 55 on which the power feeding portions 39U, 39V, 39W of the respective phase bus bars 30U, 30V, 30W can be placed is formed extending outward in the radial direction.
  • the pedestal portion 55 is formed in a substantially rectangular shape so as to be long in the circumferential direction in the plan view in the axial direction.
  • the power feeding portions 39U, 39V, 39W are arranged in parallel in the order of the U phase, the V phase, and the W phase along the longitudinal direction of the pedestal portion 55, that is, the circumferential direction of the holder main body 52.
  • the groove portions 53U, 53V, 53W, 53J, and 53N are formed such that the power feeding portions 39U, 39V, and 39W are arranged in parallel in the order of the U phase, the V phase, and the W phase. That is, six groove portions 53J into which the bus bar main body 31J of the connection bus bar 30J can be inserted are formed on the innermost peripheral side of the holder main body 52. Further, a groove 53N into which the bus bar main body 31N of the neutral point bus bar 30N can be inserted is formed on the outer side in the radial direction than the groove 53J.
  • a groove 53V into which the bus bar main body 31V of the V-phase bus bar 30V can be inserted is formed on the outer side in the radial direction than the groove 53N.
  • a groove 53U into which the bus bar main body 31U of the U-phase bus bar 30U can be inserted and a groove 53W into which the bus bar main body 31W of the W-phase bus bar 30W can be inserted are formed radially outward from the groove 53V. .
  • a part of the opening edge of each of the grooves 53U, 53V, 53W, 53J, and 53N is provided in each phase from each of the grooves 53U, 53V, 53W, 53J, and 53N.
  • the retaining claws 57a and 57b for preventing the bus bars 30U, 30V, 30W for connection, the bus bar 30J for connection, and the bus bar 30N for neutral point from coming off are formed.
  • a die-cutting hole 58 (not shown) is formed on the other side in the axial direction of the portion where the retaining claws 57a, 57b of the holder body 52 are formed.
  • the punching hole 58 By using the punching hole 58, the undercut portions (not shown) of the retaining claws 57a and 57b can be easily formed. Thereby, the manufacturing cost of the holder main body 52 can be reduced.
  • the holder main body 52 has the connecting bus bar 30J, the neutral point bus bar 30N, and the V phase in order from the radially inner side.
  • the bus bar 30V is disposed, and the U-phase bus bar 30U and the W-phase bus bar 30W are disposed on the outermost peripheral side of the holder body 52.
  • the first main bodies 131U, 131V, 131W, and 131J and the second main bodies 231U, 231V, and the second main bodies 231U, 231V, and 31J constituting the bus bar main bodies 31U, 31V, 31W, and 31J of the bus bars 30U, 30V, and 30W for the respective phases.
  • the curvature radii R1 to R8 of 231W and 231J and the radius R9 of the bus bar body 31N of the neutral point bus bar 30N are set so as to satisfy the expressions (1) to (6), respectively.
  • the gap between the bus bar bodies 31U to 31N in the radial direction is minimized.
  • the second main body 231U of the U-phase bus bar 30U and the second main body 231W of the W-phase bus bar 30W are displaced inward in the radial direction toward the tip. It is possible to prevent an extra gap from being formed between the two main bodies 231U and 231W and the bus bar main body 31N of the neutral point bus bar 30N.
  • the inner diameter E1 of the holder body 52 is set larger than the diameter E2 (see FIG. 1) of the outer peripheral wall portion 11c of the insulator 11 attached to the stator core 10.
  • the bus bar unit 50 is in a state where it is disposed radially outside the insulator 11 and is disposed at a position where it wraps in the axial direction with the insulator 11.
  • an enlarged diameter portion 92 that receives the bus bar unit 50 is formed by a step at a position corresponding to the bus bar unit 50.
  • the outer peripheral surface of the holder main body 52 is fitted into the enlarged diameter portion 92, and the bus bar unit 50 is positioned in the radial direction.
  • the bus bar unit 50 is positioned in the axial direction in such a manner that the holder main body 52 is placed on the stepped surface 92 a of the enlarged diameter portion 92.
  • a positioning groove 56 is formed along the axial direction on the outer peripheral surface of the holder main body 52, while a convex portion (not shown) facing the positioning groove 56 is formed on the enlarged diameter portion 92 of the stator housing 2. Is formed. Thereby, the circumferential positioning of the bus bar unit 50 is performed.
  • the terminals 35U, 35V, 35W, 35J, and 35N extend from the holder main body 52 toward the radially inner side in a state where the bus bar unit 50 is disposed on the radially outer side than the insulator 11, these The terminals 35U, 35V, 35W, 35J, and 35N are positioned substantially above the teeth 64 in the axial direction. For this reason, the routing path
  • the bus bar unit 50 configured in this way, the coils 12 of each phase are connected as follows.
  • FIG. 14 is a connection diagram of the coil 12. That is, as shown in the figure, each phase terminal 35U, 35V, 35W of each phase bus bar 30U, 30V, 30W of bus bar unit 50, connection terminal 35J of connection bus bar 30J, and neutral point bus bar 30N are connected. By connecting a predetermined terminal portion of each phase coil 12 to each terminal 35N, each phase coil 12 is connected in a so-called star connection system. Moreover, when winding the coil 12 around each tooth part 64, what is called double winding which winds the two coils 12 to each tooth part 64 and connects the terminals of these two coils 12 is adopted. (See FIGS. 3 and 5).
  • the coils 12Ua and 12Ub of the U-phase coil 12 are connected in parallel.
  • the coils 12Ua and 12Ub and the coils 12Uc and 12Ud are connected in series.
  • the coils 12Ua, 12Ub, 12Uc, 12Ud and the coils 12Ue, 12Uf, 12Ug, 12Uh are connected in parallel.
  • the coils 12 of each phase constitute a parallel circuit.
  • the V-phase coil 12 and the W-phase coil 12 are configured in the same manner as the U-phase coil 12. For this reason, description about the V-phase coil 12 and the W-phase coil 12 is omitted.
  • bracket 1 and 2
  • an outer flange portion 2e is formed in the opening 2a of the stator housing 2
  • a bracket 7 is provided so as to be placed on the outer flange portion 2e.
  • the bracket 7 is formed in a substantially disc shape so as to close the opening 2 a of the stator housing 2.
  • An insertion hole 71 through which the rotation shaft 6 is inserted is formed at the radial center of the bracket 7.
  • a bearing 21 for rotatably supporting the rotary shaft 6 is provided on the inner surface side of the insertion hole 71 (the surface on the stator 3 side, the right surface in FIG. 1).
  • a seal portion 72 is provided for ensuring the sealing performance between the insertion hole 71 and the rotary shaft 6.
  • a plurality of (three in this embodiment) through holes 73 for fastening and fixing the bracket 7 and the stator housing 2 with bolts (not shown) or the like are provided at equal intervals in the circumferential direction on the outer peripheral portion of the bracket 7. Is formed.
  • the outer flange portion 2e of the stator housing 2 is formed with a tongue piece portion 18 extending outward in the radial direction at a location corresponding to the through hole 73 of the bracket 7.
  • a through hole 18 a corresponding to the through hole 73 of the bracket 7 is formed in the tongue piece 18.
  • the tongue piece 18 is formed with an attachment hole 18b for fixing the brushless motor 1 to the vehicle body of the electric motorcycle, and for positioning the stator housing 2 and the bracket 7 together.
  • a hole 18c into which a positioning pin (not shown) is inserted is provided.
  • a substantially rectangular grommet receiving portion 19 is elongated in the circumferential direction at a location corresponding to the power feeding portions 39U, 39V, 39W of the bus bar unit 50 in an axial plan view. Is formed.
  • the grommet receiving portion 19 is for holding the grommet 54 attached to the power feeding portions 39U, 39V, 39W of the bus bar unit 50 in cooperation with the bracket 7.
  • a grommet storage recess 74 that can receive the grommet 54 is formed on the outer periphery of the bracket 7.
  • the grommet 54 is for improving the sealing performance between the stator housing 2 and the bracket 7 and between the stator housing 2 and the bracket 7 and the power feeding portions 39U, 39V, and 39W of the bus bar unit 50.
  • the grommet 54 is formed in a substantially rectangular parallelepiped shape so as to be elongated along the circumferential direction of the stator housing 2 by an elastic material such as rubber, in other words, so as to be elongated in the arrangement direction of the power feeding portions 39U, 39V, 39W. Is formed.
  • the insertion hole 54a which can penetrate these electric power feeding part 39U, 39V, 39W is formed in the position corresponding to electric power feeding part 39U, 39V, 39W.
  • the grommet 54 is formed with a gasket retaining groove 55 a along the longitudinal direction on one side surface 54 b that contacts the grommet receiving portion 19 of the stator housing 2.
  • gasket circulation holes 55 b are formed along the axial direction of the stator housing 2. Each gasket circulation hole 55b communicates with the gasket pool groove 55a.
  • the gasket pool groove 55a and the gasket circulation hole 55b are places where the liquid gasket G applied when the brushless motor 1 is assembled is filled.
  • the liquid gasket G is injected into the gasket circulation hole 55 b formed in the grommet 54. Then, the liquid gasket G is filled into the gasket pool groove 55a through the gasket circulation hole 55b. For this reason, even when the liquid gasket G is applied after the bus bar unit 50 is assembled to the stator housing 2, the liquid gasket G is easily spread between the grommet receiving portion 19 and the grommet 54 of the stator housing 2. Can be made. Thus, after applying the liquid gasket G along the outer flange portion 2e of the stator housing 2, the stator housing 2 and the bracket 7 are fastened and fixed by bolts (not shown), thereby completing the assembly of the brushless motor 1. .
  • terminals 35U, 35V, 35W, 35J, and 35N extend from the holder main body 52 toward the radially inner side in a state where the bus bar unit 50 is disposed on the radially outer side than the insulator 11, each of these terminals
  • the terminals 35U, 35V, 35W, 35J, and 35N are positioned substantially above the teeth 64 in the axial direction. For this reason, the routing path
  • the bus bar unit 50 is disposed on the radially outer side than the insulator 11, it is easy to secure a space in the upper axial direction of each tooth portion 64, and the heat dissipation effect of the heat generated in the coil 12 can be enhanced. . For this reason, the temperature rise of the brushless motor 1 can be suppressed, and the motor efficiency of the brushless motor 1 can be increased. Since the heat generated from the stator core 10 is less likely to be transmitted to the bus bar unit 50, the temperature rise of the bus bar unit 50 can be more reliably suppressed. As a result, the motor efficiency of the brushless motor 1 can be further increased. Become.
  • the bus bar bodies 31U, 31V, 31W, 31J of the bus bars for the phases 30U, 30V, 30W and the connection bus bar 30J are respectively connected to the first bodies 131U, 131V, 131W, 131J having different radii of curvature and the second bodies 231U. , 231V, 231W, and 231J. That is, the curvature radii R1 to R8 of the first main body 131U, 131V, 131W, 131J and the second main body 231U, 231V, 231W, 231J and the radius R9 of the bus bar main body 31N of the neutral point bus bar 30N are respectively expressed by equations. (1) to (6) are set to be satisfied.
  • the gap between the bus bar bodies 31U to 31N in the radial direction can be minimized.
  • there is an excess gap between the second main body 231U of the U-phase bus bar 30U and the second main body 231W of the W-phase bus bar 30W and the bus bar main body 31N of the neutral point bus bar 30N. Can be prevented. Therefore, the radial direction of the bus bar unit 50 can be reduced, and as a result, the brushless motor 1 can be reduced in size.
  • each bus bar 30U, 30V, 30W is formed in the middle of the bus bar main body 31U, 31V, 31W, 31J in the extending direction of each phase bus bar 30U, 30V, 30W and the connection bus bar 30J.
  • 30J can be changed to reduce the diameter of the bus bar unit 50 in the radial direction.
  • each phase bus bar 30U, 30V, 30W and connection bus bar 30J are formed by continuously changing the radius of curvature of each bus bar body 31U, 31V, 31W, 31J without forming a bent portion. Becomes easy, and the manufacturing cost can be reduced.
  • the holder main body 52 in which the respective groove portions 53U, 53V, 53W, 53J, 53N are formed. Is used. Then, by forming the retaining claws 57a and 57b on part of the opening edges of the groove portions 53U, 53V, 53W, 53J and 53N of the holder main body 52, the connection bus bars 30J from the holder main body 52 are included. It is possible to reliably prevent the phase bus bars 30U, 30V, 30W and the neutral point bus bar 30N from coming off.
  • each phase bus bar 30U, 30V, 30W including the connection bus bar 30J and the neutral point bus bar 30N it is not necessary to mold them with a resin mold body. No need for large-scale equipment.
  • the facilities for manufacturing the bus bar unit 50 can be simplified as compared with the prior art, and the manufacturing cost of the bus bar unit 50 can be reduced.
  • each bus-bar 30U, 30V, 30W, 30J, 30N and the holder main body 52 can be manufactured easily, and manufacturing cost can be reduced.
  • each bus-bar main body 31U, 31V, 31W, 31J is made into the shape different from the shape of each groove part 53U, 53V, 53W, 53J, and the case where it hold
  • the bus bar bodies 31U, 31V, 31W, 31J can be securely held.
  • a die-cutting hole 58 (not shown) is formed on the other side in the axial direction where the retaining claws 57a and 57b of the holder main body 52 are formed.
  • the punching hole 58 By using the punching hole 58, the undercut portions (not shown) of the retaining claws 57a and 57b can be easily formed. Thereby, the structure of a metal mold
  • the loop part 12a is formed in the coil 12 in the middle of winding around the tooth part 64 (between the 28th and 29th times in this embodiment).
  • the time of winding work can be shortened compared with normal double winding.
  • the cost of the apparatus for winding the coil 12 can be reduced. That is, for example, in the case of performing double winding, there may be a need for equipment for winding two coils around the tooth portion 64 simultaneously using two nozzles. However, in the present embodiment, a single nozzle is used, and the single winding can be operated by simply operating this single nozzle. Therefore, the cost of the apparatus for winding the coil 12 can be reliably reduced.
  • a gasket retaining groove 55a is formed on one side surface 54b of the grommet 54 attached to the power feeding portions 39U, 39V, 39W of the bus bar unit 50, and gasket circulation holes 55b are formed on both ends in the longitudinal direction of the grommet 54.
  • the present invention is not limited to the above-described embodiment, and includes various modifications made to the above-described embodiment without departing from the spirit of the present invention.
  • the present invention is not limited to this, and the structure of the brushless motor 1 of this embodiment can be applied to various electric motors including the bus bar unit 50.
  • the case where the winding number of the coil 12 to each teeth part 64 was 28 times was demonstrated.
  • the number of windings around the tooth portion 64 is not limited to 28, and the number of windings can be changed as appropriate in order to obtain desired motor characteristics.
  • the bus bar unit 50 is connected to one terminal portion of the coil 12 of each phase (U-phase bus bar 30U, V-phase bus bar 30V, W-phase bus bar 30W).
  • a neutral point bus bar 30N connected to the other terminal portion of the coil 12 of each phase, and the coil 12 of each phase is connected by a so-called star connection method by the neutral point bus bar 30N.
  • the present invention is not limited to this, and the configuration of the present invention can be applied to a so-called delta connection method that does not have a neutral point. In this case, the bus bar unit 50 does not have the neutral point bus bar 30N.
  • the grommet 54 was formed with elastic materials, such as rubber
  • the present invention is not limited to this, and any material that can ensure a sealing property between the stator housing 2 and the bracket 7 may be used.
  • the grommet 54 may be formed of a resin material instead of rubber.
  • the grommet 54 attached to the power feeding portions 39U, 39V, and 39W of the bus bar unit 50 has a gasket along the longitudinal direction on one side surface 54b that abuts the grommet receiving portion 19 of the stator housing 2.
  • the case where the retaining groove 55a is formed to improve the sealing performance between the grommet receiving portion 19 and the grommet 54 of the stator housing 2 has been described.
  • the present invention is not limited to this, and the grommet 54 may be formed with the following gasket pool groove 155a.
  • FIG. 15 is a plan view of a grommet 154 in a modification of the present embodiment.
  • gasket circulation holes 55 b are formed along the axial direction of the stator housing 2 at both ends of the grommet 54 in the longitudinal direction.
  • two gasket retaining grooves 155 that are substantially L-shaped in an axial plan view are formed on one side surface 54 b that contacts the grommet receiving portion 19 of the stator housing 2.
  • the gasket pool groove 155 will be described in detail. Each gasket pool groove 155 communicates with the gasket circulation hole 55b.
  • the gasket pool groove 155 includes a first groove portion 155a that extends radially outward from the gasket circulation hole 55b along the extending direction of the power feeding portions 39U, 39V, and 39W, and the gasket housing hole 55b. And a second groove 155b extending outward along the circumferential direction.
  • the first groove portion 155a and the second groove portion 155b are formed so as to communicate with each other and have a substantially L shape in an axial plan view.
  • the insulator and the bus bar unit can be wrapped in the axial direction. For this reason, the height from the stator core to the bus bar unit can be suppressed correspondingly, and as a result, the axial length of the brushless motor can be shortened, and the brushless motor can be miniaturized.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Insulation, Fastening Of Motor, Generator Windings (AREA)
PCT/JP2013/060522 2012-04-13 2013-04-05 ブラシレスモータ WO2013154054A1 (ja)

Priority Applications (1)

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JP2012092148A JP5818737B2 (ja) 2012-04-13 2012-04-13 ブラシレスモータ
JP2012-092148 2012-04-13

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JP (1) JP5818737B2 (enrdf_load_stackoverflow)
CN (1) CN104205579B8 (enrdf_load_stackoverflow)
WO (1) WO2013154054A1 (enrdf_load_stackoverflow)

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FR3018964A1 (fr) * 2014-03-24 2015-09-25 Valeo Equip Electr Moteur Element d'interconnexion pour le branchement des bobines du stator
EP3072943A1 (en) 2015-03-26 2016-09-28 Idemitsu Kosan Co., Ltd. Dibenzofuran/carbazole-substituted benzonitriles
WO2016184720A1 (de) * 2015-05-18 2016-11-24 Robert Bosch Gmbh Stator für eine elektrische maschine, sowie verfahren zur herstellung eines solchen
WO2018174252A1 (en) * 2017-03-24 2018-09-27 Nidec Corporation Electric motor

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JP6287784B2 (ja) * 2014-11-28 2018-03-07 日本電産株式会社 モータ
JP2020043734A (ja) * 2018-09-13 2020-03-19 本田技研工業株式会社 回転電機用ステータコアおよび回転電機
KR102717963B1 (ko) * 2019-01-11 2024-10-16 엘지이노텍 주식회사 모터
JP2025110574A (ja) * 2024-01-16 2025-07-29 トヨタ自動車株式会社 モータ

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JP2008187875A (ja) * 2007-01-31 2008-08-14 Aichi Elec Co 回転機用巻線接続装置、回転機用固定子及び回転機
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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3018964A1 (fr) * 2014-03-24 2015-09-25 Valeo Equip Electr Moteur Element d'interconnexion pour le branchement des bobines du stator
WO2015145007A3 (fr) * 2014-03-24 2016-03-10 Valeo Equipements Electriques Moteur Élément d'interconnexion pour le branchement des bobines du stator
US10256692B2 (en) 2014-03-24 2019-04-09 Valeo Equipements Electriques Moteur Interconnection element for connection of stator coils
EP3072943A1 (en) 2015-03-26 2016-09-28 Idemitsu Kosan Co., Ltd. Dibenzofuran/carbazole-substituted benzonitriles
WO2016184720A1 (de) * 2015-05-18 2016-11-24 Robert Bosch Gmbh Stator für eine elektrische maschine, sowie verfahren zur herstellung eines solchen
WO2018174252A1 (en) * 2017-03-24 2018-09-27 Nidec Corporation Electric motor
JP2020511920A (ja) * 2017-03-24 2020-04-16 日本電産株式会社 電動機
US11038392B2 (en) 2017-03-24 2021-06-15 Nidec Corporation Electric motor

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Publication number Publication date
CN104205579B (zh) 2016-11-09
CN104205579A (zh) 2014-12-10
CN104205579B8 (zh) 2017-04-12
JP5818737B2 (ja) 2015-11-18
JP2013223293A (ja) 2013-10-28

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