JP2007068314A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components and the man-hour of component assembling work in a rotary electric machine in which the coils of three phases are connected in bus ring. <P>SOLUTION: In the rotary electric machine 10 where each of a plurality of interconnected cores 21 constituting a stator 13 is provided with a resin bobbin 22 and each coil 23 of U-phase, V-phase and W-phase is wound around the coil winding portion 22A of each bobbin 22, each bus ring A-D is held by a ring holding portion 24A-24D provided in each bobbin 22, each bus ring A-D is formed tubularly, part of the tubular portion 26 of each bus ring A-D along the circumferential direction serves as a coil joint 27 projecting axially, and each coil 23 is connected with the coil joint 27 of each bus ring A-D. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine.

As described in Patent Document 1, as a rotating electrical machine, a resin bobbin is attached to each of a plurality of cores constituting a stator, and U-phase, V-phase, and W-phase coils are wound around the coil winding portion of each bobbin. The U-phase, V-phase, and W-phase coils are connected to each of the three bus rings A to C, the common side of each coil is connected to the neutral bus ring D, and the coils are star-connected. There is something.
JP2004-157056

  In the rotating electrical machine of Patent Document 1, each bus ring is formed into a substantially short cylindrical shape, and the short cylindrical portion of each bus ring is fitted into each annular ring holding groove provided concentrically on a resin bus ring holder. This bus ring holder is assembled to the front surface of the bobbin. At this time, each bus ring includes a bent portion that is bent outward at a right angle from a portion along the circumferential direction of the short cylindrical portion, and each coil is connected to each of the bent portions.

  Therefore, the rotating electric machine of Patent Document 1 uses a bus ring holder that is separate from the bobbin, which increases the number of parts and requires an extra step of assembling the bus ring holder. The bus ring holder is assembled on the front surface of the bobbin, and the size is increased by the assembly cost. Further, each bus ring is formed in a cylindrical shape and further includes a bent portion, and the shape of the bus ring is complicated.

  An object of the present invention is to reduce the number of parts and reduce the number of parts assembling steps in a rotating electrical machine in which three-phase coils are connected to a bus ring.

  According to the first aspect of the present invention, a resin bobbin is provided on each of a plurality of mutually connected cores constituting the stator, and each coil of the U phase, V phase, and W phase is wound around the coil winding portion of each bobbin. A rotation formed by connecting the U-phase, V-phase, and W-phase coils to each of the three bus rings A to C, connecting the common side of each coil to the neutral bus ring D, and star-connecting each coil. In an electric machine, a coil in which each bus ring is held in a ring holding portion provided on each bobbin, each bus ring is cylindrical, and a portion along the circumferential direction of the cylindrical portion of each bus ring is protruded in the axial direction. As a connection portion, each coil is connected to a coil connection portion of each bus ring.

  According to a second aspect of the present invention, in the first aspect of the present invention, each of the bobbins further has a protruding portion on the outer peripheral side of the coil winding portion, and each ring holding portion is provided at four positions along the radial direction of the protruding portion. It is a thing.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, each of the ring holding portions is formed in a groove shape, and the cylindrical portion of each bus ring is inserted and held in each of the groove-shaped ring holding portions.

  The invention of claim 4 is the invention according to any one of claims 1 to 3, wherein the bobbins are connected to each other, and the connecting portions of adjacent bobbins are made thin.

(Claim 1)
(a) Since each bus ring is held in each ring holding part provided on the bobbin, a separate bus ring holder from the bobbin is unnecessary, the assembly accuracy is improved, the number of parts is reduced, and the parts are assembled. Man-hours can be reduced. Each bobbin is held on the bobbin itself and can be downsized.

  (b) Each bus ring has a cylindrical shape, and a coil connection portion provided in a part along the circumferential direction of the cylinder part is also a part in which the part along the circumferential direction of the cylinder part is simply projected in the axial direction. The shape of the ring can be simplified and the part workability can be improved.

(Claim 2)
(c) Each bobbin has a protruding portion on the outer peripheral side of the coil winding portion, and each ring holding portion is provided at four positions along the radial direction of the protruding portion. Accordingly, the respective bus rings can be arranged in an orderly manner in a concentric manner around the coil winding portion of the bobbin.

(Claim 3)
(d) The cylindrical portion of each bus ring can be inserted into each groove-shaped ring holding portion, and positioned and held in the ring holding portion corresponding to each bus ring, so that the assembly of each bus ring can be improved.

(Claim 4)
(e) By connecting the bobbins attached to the plurality of connecting cores to each other, the number of parts of the bobbins can be unified. At this time, by thinning the connecting portions of adjacent bobbins, the flexibility of adjacent bobbins can be improved and the assembly of the stator can be improved.

  1 is a sectional view showing a motor, FIG. 2 is a front view of FIG. 1, FIG. 3 is a rear view of FIG. 1, and FIG. 4 is a sectional view showing each bus ring held by each ring holding portion of a bobbin. Is a front view showing the connecting core, FIG. 6 is a view taken along the line VI-VI in FIG. 5, FIG. 7 is a plan view in which the bus ring is inserted and held in the grooved ring holding portion of the bobbin, and FIG. FIG. 9 is a front view showing an annular stator core.

  A DC brushless motor 10 as a rotating electrical machine of the present invention has a housing 11 and a yoke 12 as shown in FIGS. 1 to 3, and a cylindrical stator 13 is accommodated in a bottomed cylindrical yoke 12. The rotor 14 is disposed in 13 cylinders, and the rotating shaft 15 of the rotor 14 is rotatably supported by a bearing 16 provided at the closed end of the yoke 12 and a bearing 17 provided on the housing 11 side.

  The housing 11 is made of an aluminum material, the yoke 12 is made of a cup-shaped molded body of a thin steel plate, and one end outer periphery of the housing 11 is fitted to the inner periphery of the open end of the yoke 12, and one end surface of the housing 11 and the yoke 12 are fitted. A seal member 18 is sandwiched between the open end of the housing 11 and the housing 11 and the yoke 12 are fixed by a set screw 19.

  The stator 13 is configured by arranging a plurality of, for example, twelve cores 21 connected to each other on the inner periphery of the yoke 12 so as to be adjacent to each other on the circumference. Each core 21 is formed by laminating silicon steel plates, and a resin bobbin 22 is attached thereto. The stator 13 winds the motor coil 23 of each phase that forms three phases of the U phase, the V phase, and the W phase around the coil winding portion 22 </ b> A of each bobbin 22.

  As shown in FIG. 4, each of the coils 23 forming the U phase, the V phase, and the W phase is connected to each of the three bus rings A to C, and the common side of each coil 23 is connected to the neutral bus ring D. Each coil 23 is star-connected.

  To each of the bus rings A to C, U-phase, V-phase, and W-phase external connection terminals 31 (31A to 31C) are connected. On the other hand, U-phase, V-phase, and W-phase motor lead wires 33 (33A to 33C) extending to an external control circuit are inserted into the grommet 32 attached to the housing 11. The external connection terminals 31 and the motor lead wires 33 corresponding to each other are connected by three connection portions 34 (34A to 34C) provided inside the housing 11.

  The rotor 14 has a magnet 14A that generates a magnetic field attached to a rotor yoke 29 made of a magnetic material fixed to the rotary shaft 15 by adhesion or the like, and a holding tube (not shown) is attached to the outer surface of the magnet 14A.

  The motor 10 includes a resolver 40 including a resolver rotor part 41 and a resolver stator part 42. That is, a resolver rotor portion 41 that rotates together with the rotor 14 is attached to the outer periphery of the rotor 14 on the output end side of the rotating shaft 15. A resolver stator portion 42 is attached to the inner periphery of the stator 13 side, in other words, the housing 11 side. The resolver stator unit 42 is disposed so as to surround the resolver rotor unit 41, and detects the rotational position of the rotor 14 by a change in reluctance generated between the resolver stator unit 42 and the resolver rotor unit 41. In accordance with the detected rotational position of the rotor 14, a predetermined pattern of current is supplied to the U-phase, V-phase, and W-phase coils 23 by an external control circuit to drive the motor 10.

  The resolver stator portion 42 is provided with a male connector 43A. A female connector 43B to which a sensor lead wire 44 is connected is connected to the male connector 43A. The sensor lead wire 44 extends from the grommet 32 attached to the housing 11 to an external control circuit.

  Hereinafter, the holding of the bus rings A to D to the bobbins 22 in the stator 13 of the motor 10 and the connection of the coils 23 to the bus rings A to D will be described.

  Each bus ring A to D is positioned and held in each of ring holding portions 24A to 24D provided in each bobbin 22.

  As shown in FIGS. 5 to 7, each bobbin 22 has a protruding portion 22 </ b> B on the outer peripheral side of the coil winding portion 22 </ b> A located on the opening end side of the yoke 12 with the stator 13 fitted in the yoke 12. The ring holding portions 24A to 24D are provided concentrically in order at each of the four positions along the outer peripheral side from the inner peripheral side in the radial direction of the end surface of the protruding portion 22B. The ring holding portion 24A that holds the bus ring A is located on the innermost periphery, and the ring holding portion 24D that holds the neutral bus ring D is located on the outermost periphery. Each of the ring holding portions 24A to 24D has an annular groove shape.

  Each of the bus rings A to D has a cylindrical shape obtained by bending a flat plate material in a state where the bus rings A to D are inserted and held in the groove-like ring holding portions 24A to 24D of the bobbins 22 of the stator 13 fitted into the yoke 12. Each of the bus rings A to D has a C-shaped cylindrical shape (however, an endless circular cylindrical shape is also possible).

  Each of the ring holding portions 24 </ b> A to 24 </ b> C need not extend over all of the bobbins 22 attached to each of the 12 cores 21. In the circumferential direction of each bobbin 22 of the stator 13 fitted in the yoke 12, the ring holding portion 24A for holding the bus ring A extends over the first bobbin 22 to the 10th (U-phase) bobbin 22, and the bus ring The ring holding part 24B for holding B extends over the first bobbin 22 to 11th (for V-phase) bobbin 22, and the ring holding part 24C for holding the bus ring C is used for the first bobbin 22 to 12th ( Wbo phase 22). Note that the ring holding portion 24 </ b> D that holds the neutral bus ring D extends over all bobbins 22.

  Each of the bus rings A to D is a coil connecting portion 27 in which a part of the circumferential direction of each cylindrical portion 26 is projected straight in the axial direction. The bus ring A protrudes from the coil connection portion 27A for each bobbin 22 of the core 21 corresponding to the U-phase coil 23 in the circumferential direction of the cylindrical portion 26, and the bus ring B extends from the V-phase coil in the circumferential direction of the cylindrical portion 26. The coil connection portion 27B protrudes for each bobbin 22 of the core 21 corresponding to 23, and the bus ring C extends in the circumferential direction of the cylindrical portion 26 with the coil connection portion 27C for each bobbin 22 of the core 21 corresponding to the W-phase coil 23. The neutral bus ring D protrudes from the coil connecting portion 27D for each bobbin 22 of the core 21 corresponding to the coils 23 of all phases in the circumferential direction of the cylindrical portion 26.

  Both end portions 23A and 23B of the coil 23 wound around the bobbin 22 (coil winding portion 22A) of each core 21 are connected to the coil connection portions 27A to 27D of the respective bus rings A to D from the inner diameter side. The Both end portions 23A and 23B of the U-phase coil 23 are connected to the coil connection portion 27A of the bus ring A and the coil connection portion 27D of the neutral bus ring D, and both the end portions 23A and 23B of the V-phase coil 23 are The coil connection portion 27B of the bus ring B and the coil connection portion 27D of the neutral bus ring D are connected to both ends 23A and 23B of the W-phase coil 23. The coil connection portion 27C of the bus ring C and the neutral bus ring D It is connected to the coil connection part 27D. Each end 23A, 23B of each coil 23 is extended in the axial direction from the coil winding portion 22A located on the opening end side of the yoke 12 with the stator 13 fitted into the yoke 12. Are bent in an L shape outward in the radial direction and connected to the coil connection portions 27A to 27C of the respective bus rings A to C and the coil connection portion 27D of the neutral bus ring D (FIGS. 8 and 9). .

  Each of the bus rings A to C is radially outward from the start end held by each of the ring holding portions 24A to 24C of the first bobbin 22 in the circumferential direction of each bobbin 22 of the stator 13 fitted into the yoke 12. The external connection terminals 31 </ b> A to 31 </ b> C for each phase described above are connected to the bending start end portion. It should be noted that an external connection terminal 31 may be formed integrally with the bending start end portion and connected to the motor lead wire 33.

Therefore, the assembly procedure of the stator 13 in the motor 10 is as follows.
(1) A bobbin 22 is attached to each of all twelve connecting cores 21, and these cores 21 are set in a straight line (FIGS. 5 and 6).

  (2) The coil 23 of each phase is wound around the coil winding part 22A of each bobbin 22 (FIG. 8).

  (3) The flat bus rings A to D are inserted and held in the ring holding portions 24A to 24D of the protruding portions 22B of the bobbins 22 (FIGS. 7 and 8).

  (4) Both end portions 23A and 23B of the U-phase coil 23 are connected to the coil connection portion 27A of the bus ring A and the coil connection portion 27D of the neutral bus ring D, and both end portions 23A and 23B of the V-phase coil 23 are connected. Are connected to the coil connection portion 27B of the bus ring B and the coil connection portion 27D of the neutral bus ring D, and both end portions 23A and 23B of the W-phase coil 23 are connected to the coil connection portion 27C of the bus ring C and the neutral bus. It connects with the coil connection part 27D of the ring D (FIG. 7, FIG. 8).

  (5) All twelve cores 21 and bobbins 22 are arranged in an annular shape (FIG. 9), and are fitted into the inner periphery of the yoke 12 to form the stator 13.

  In addition, through the above-mentioned (1) and (2), all 12 cores 21 and bobbins 22 around which the coils 23 of each phase are wound are arranged in a ring and fitted into the inner periphery of the yoke 12, and then the cylindrical bus ring Each of A to D may be inserted and held in each of the ring holding portions 24A to 24D of the protruding portion 22B of each bobbin 22, and the above (4) may be performed to form the stator 13.

According to the present embodiment, the following operational effects can be obtained.
(a) Since each bus ring A to D is held in each of the ring holding portions 24A to 24D provided on the bobbin 22, a separate bus ring holder from the bobbin 22 is unnecessary, and the assembly accuracy is improved. The number of points can be reduced, and the number of parts assembly steps can be reduced. The bobbins 22 themselves hold the bus rings A to D, and can be downsized.

  (b) Each bus ring A to D is formed in a cylindrical shape, and the coil connection portion 27 provided in a part along the circumferential direction of the cylinder part 26 also has a part along the circumferential direction of the cylinder part 26 simply protruding in the axial direction. Therefore, the shape of the bus rings A to D can be simplified, and the part workability can be improved.

  (c) Each bobbin 22 has a protruding portion 22B on the outer peripheral side of the coil winding portion 22A, and the ring holding portions 24A to 24D are provided at four positions along the radial direction of the protruding portion 22B. Accordingly, the bus rings A to D can be arranged in an orderly manner in a concentric manner around the coil winding portion 22 </ b> A of the bobbin 22.

  (d) The tube portions 26 of the respective bus rings A to D can be inserted into the groove-shaped ring holding portions 24A to 24D, and can be positioned and held in the ring holding portions 24A to 24D corresponding to the respective bus rings A to D. The assemblability of A to D can be improved.

  In the embodiment of the present invention, the bobbins 22 attached to the connecting core 21 may be connected to each other in advance, and the connecting portions of the adjacent bobbins 22 may be thin. According to this, the number of parts of the bobbin 22 can be unified by connecting the bobbins 22 attached to the plurality of connecting cores 21 to each other. At this time, by making the connecting portions of the adjacent bobbins 22 thin (notched portions), the flexibility of the adjacent bobbins 22 can be improved and the assemblability of the stator 13 can be improved. At this time, the bus rings A to D may be molded in the connecting bobbin 22 in advance, and the flexibility of the bus rings A to D integrated with the bobbin 22 can be improved by thinning the connecting part of the bobbin 22.

  In the practice of the present invention, each bobbin 22 may be molded in advance on each of the connecting cores 21.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and even if there is a design change or the like without departing from the gist of the present invention. It is included in the present invention.

FIG. 1 is a sectional view showing a motor. FIG. 2 is a front view of FIG. FIG. 3 is a rear view of FIG. FIG. 4 is a cross-sectional view showing each bus ring held by each ring holding portion of the bobbin. FIG. 5 is a front view showing the connecting core. FIG. 6 is a view taken along the line VI-VI in FIG. FIG. 7 is a plan view in which the bus ring is inserted and held in the grooved ring holding portion of the bobbin. FIG. 8 is a front view showing a linear stator core. FIG. 9 is a front view showing the annular stator core.

Explanation of symbols

10 Motor (Rotating electric machine)
13 Stator 21 Core 22 Bobbin 22A Coil winding part 22B Protrusion part 23 Coil 24A-24D Ring holding part 26 Tube part 27, 27A-27D Coil connection part

Claims (4)

A resin bobbin is provided on each of a plurality of cores connected to each other constituting the stator, and each coil of the U phase, V phase, and W phase is wound around the coil winding portion of each bobbin,
A rotation formed by connecting the U-phase, V-phase, and W-phase coils to each of the three bus rings A to C, connecting the common side of each coil to the neutral bus ring D, and star-connecting each coil. In electric
Hold each bus ring in each of the ring holders on each bobbin,
Each bus ring is formed into a cylindrical shape, and a part along the circumferential direction of the cylindrical portion of each bus ring is a coil connecting portion protruding in the axial direction, and each coil is connected to the coil connecting portion of each bus ring. Rotating electric machine.   2. The rotating electrical machine according to claim 1, wherein each bobbin has a protruding portion on an outer peripheral side of the coil winding portion, and each ring holding portion is provided at four positions along a radial direction of the protruding portion.   The rotating electrical machine according to claim 1 or 2, wherein each ring holding portion is formed in a groove shape, and a cylindrical portion of each bus ring is inserted and held in each groove-shaped ring holding portion.   The rotating electrical machine according to any one of claims 1 to 3, wherein the bobbins are connected to each other, and connecting portions of adjacent bobbins are thinned.

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