JP2006333666A - Rotary electric machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the number of components so as to reduce component assembling manpower, in a rotary electric machine prepared by connecting each coil of three-phase to a bus ring. <P>SOLUTION: A resin bobbin 22 is fitted to each of a plurality of cores 21 which constitute a stator 13, each coil 23 of U-phase, V-phase and W-phase is wound around the coil winding part 22A of each bobbin 22 to connect each coil 23 of the U-phase, the V-phase and the W-phase to three bas rings A to C and to connect the common side of each coil 23 to a neutral bus ring D. In the rotary electric machine 10 prepared by star-connecting each coil 23, each bus ring A to D is held with each ring holding part 24A to 24D provided to the bobbin 22. <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 attached to each of the plurality of cores constituting the stator, and the U-phase, V-phase, and W-phase coils are wound around the coil winding portion of each bobbin. In the rotating electrical machine in which the coils of the phase and W phase 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 each coil is star-connected, The bus ring is held in each of the ring holding portions provided on the bobbin.

  According to a second aspect of the present invention, in addition to the first aspect of the invention, each of the bus rings is a flat ring.

  According to a third aspect of the present invention, in the second aspect of the present invention, the bobbin further has a protruding portion protruding from the coil winding portion, and each ring holding portion is provided at four positions along the protruding direction of the inner surface of the protruding portion. It is a thing.

  According to a fourth aspect of the present invention, in addition to the third aspect of the present invention, the inner surface of the bobbin protruding portion forms an inclined surface that expands in the protruding direction, and each ring is held at four positions along the inclined direction of the inclined surface. A part is provided.

  According to a fifth aspect of the present invention, in the third or fourth aspect of the present invention, a neutral bus ring is provided on the ring holding portion closest to the coil winding portion of the four ring holding portions provided on the inner surface of the bobbin protruding portion. D is retained.

(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.

(Claim 2)
(b) Since each bus ring is a flat ring, the shape of the bus ring can be simplified, and the workability of parts can be improved.

(Claim 3)
(c) By providing the ring holding portions at four positions along the protruding direction of the inner surface of the bobbin protruding portion, the flat bus rings held by the ring holding portions can be arranged in an orderly manner.

(Claim 4)
(d) The inner surface of the bobbin protruding portion forms an inclined surface that expands in the protruding direction, and each ring holding portion is provided at four positions along the inclined direction of the inclined surface. Accordingly, the outer diameters of the respective bus rings are made different, and the bus rings are inserted into the inward of the sloped surface in order from the smaller diameter bus rings, so that each bus ring can be positioned and held in the corresponding ring holding portion, and the assemblability of each bus ring can be improved. .

(Claim 5)
(e) The neutral bus ring D to which the common side terminal of each coil is connected is held by the ring holding part closest to the coil winding part among the four ring holding parts provided on the inner surface of the protruding part of the bobbin. . Therefore, it is not necessary to wire through a large number of common terminals of each coil connected to the neutral bus ring D to the other bus rings A to C, and the assemblability of each phase bus ring 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 perspective view showing each bus ring, and FIG. 6 is a cross-sectional view showing a modified example of the bobbin.

  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 the yoke 12. The rotor 14 is disposed, 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 and the like, the yoke 12 is made of an iron plate cup-shaped molded body, and the outer periphery of a protruding portion 22B of a bobbin 22 (described later) of the stator 13 press-fitted into the yoke 12 is fitted to the inner periphery of one end of the housing 11. The seal member 18 is sandwiched between one end face of the housing 11 and the open end of the yoke 12, and the housing 11 and the yoke 12 are fixed by a set screw 19.

  The stator 13 is formed by arranging a plurality of, for example, twelve cores 21 fitted on the inner periphery of the yoke 12 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 U phase, V phase, and W phase around the coil winding portion 22A 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.

  Each of the bus rings A to D is positioned and held in each of the ring holding portions 24A to 24D provided on the bobbin 22. Each bus ring A to D forms a flat plate ring as shown in FIG. Each of the bus rings A to D has a short circumferential shape or a C shape with a slit in a part of the circumferential direction.

  The bobbin 22 has a protruding portion 22B protruding from the coil winding portion 22A, and the ring holding portions 24A to 24D are provided at four positions along the protruding direction of the inner surface of the protruding portion 22B.

  Of the four ring holding portions 24A to 24D provided on the inner surface of the protruding portion 22B of the bobbin 22, the neutral bus ring D is held by the ring holding portion 24D closest to the coil winding portion 22A. In the present embodiment, a ring holding portion 24D, a ring holding portion 24A, a ring holding portion 24B, and a ring holding portion 24C are provided in order from the coil winding portion 22A side of the inner surface of the protruding portion 22B in the protruding direction.

  In the present embodiment, the inner surface of the protruding portion 22B of the bobbin 22 is formed into a gradient surface that expands in the protruding direction, and the groove-shaped ring holding portions 24A to 24D are respectively provided at four positions along the gradient direction of the gradient surface. Provide. Therefore, the inner surfaces of the protrusions 22B provided on the bobbins 22 of the cores 21 fitted on the inner periphery of the yoke 12 form a conical surface. At this time, the ring holding portions 24A to 24D provided on the inner surface of each protrusion 22B form an annular groove, and the groove diameters of the annular grooves formed by the ring holding portions 24A to 24D are different from each other. . In this embodiment, the groove diameter increases in the order of the ring holding part 24D, the ring holding part 24A, the ring holding part 24B, and the ring holding part 24C, and the neutral bus ring D, bus ring A, bus ring B, and bus ring corresponding to them. C also increases the outer diameter in order. Each bus ring D, A, B, C is inserted in order from the outside of the sloped surface of the protruding portion 22B in order from the small-diameter neutral bus ring D, and is supported by itself and / or elastic expansion / contraction deformation of the bobbin 22 The ring holding portions (annular grooves) 24D, 24A, 24B, and 24C are held in the diameter-expanded state after being dropped, and are positioned and arranged in parallel to each other.

  Each bus ring A to C is connected to each of the U-phase, V-phase, and W-phase coils 23 via coil connection terminals 23A to 23C, and the neutral bus ring D is connected to the common side of each coil 23 via a common terminal 23D. Connected to. Since the bus rings A to D are arranged in parallel in the above-described order along the protruding direction of the protruding portion 22B of the bobbin 22, the common terminal 23D of each coil 23 is in the flat plate of the innermost neutral bus ring D. Directly connected, the U-phase coil connection terminal 23A penetrates the through hole provided in the neutral bus ring D in an insulated state and is connected to the inside of the plate of the bus ring A, and the V-phase coil connection terminal 23B is connected to the bus ring D, The through-hole provided in A is penetrated in an insulated state and connected to the flat plate of the bus ring B, and the W-phase coil connection terminal 23C penetrates the through-hole provided in the bus rings D, A and B in an insulated state. It is connected in the flat plate of the bus ring C. In addition, the through-hole provided in the bus ring can be changed to a slit groove shape in consideration of assembly.

  A U-phase, V-phase, and W-phase external connection terminal 25 is connected to each of the bus rings A to C. On the other hand, U-phase, V-phase, and W-phase motor lead wires 27 extending to an external control circuit are inserted into the grommet 26 attached to the housing 11. The external connection terminals 25 and motor lead wires 27 corresponding to each other are connected by three connection portions 28 provided in the housing 11.

  The rotor 14 is attached with a magnet 29 that generates a magnetic field on the rotating shaft 15 made of a magnetic material such as iron by bonding or the like, and a holding tube (not shown) is attached to the outer surface of the magnet 29.

  The motor 10 includes a resolver 30 including a resolver rotor portion 31 and a resolver stator portion 32. That is, a resolver rotor portion 31 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 32 is attached to the inner periphery of the stator 13 side, in other words, the housing 11 side. The resolver stator unit 32 is disposed so as to surround the resolver rotor unit 31, and detects the rotational position of the rotor 14 by a change in reluctance generated between the resolver stator unit 32 and the resolver rotor unit 31. 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 32 is provided with a male connector 33A. A female connector 33B to which a sensor lead wire 34 is connected is connected to the male connector 33A. The sensor lead wire 34 extends from the grommet 26 attached to the housing 11 to an external control circuit.

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 not required, the number of parts is reduced, and the part set Man-hours can be reduced. The bobbins 22 themselves hold the bus rings A to D, and can be downsized.

  (b) Since each of the bus rings A to D is a flat ring, the shape of the bus ring can be simplified and the parts workability can be improved.

  (c) By providing the ring holding portions 24A to 24D at four positions along the protruding direction of the inner surface of the protruding portion 22B of the bobbin 22, each plate-shaped phase bus held in each of the ring holding portions 24A to 24D Rings A to D can be arranged side by side in an orderly manner.

  (d) The inner surface of the protruding portion 22B of the bobbin 22 forms a gradient surface that expands in the protruding direction, and the ring holding portions 24A to 24D are provided at four positions along the gradient direction of the gradient surface. Accordingly, the outer diameters of the respective bus rings A to D can be made different, and the bus rings A to D can be easily positioned and held in the corresponding ring holding portions by sequentially inserting the bus rings A to D inward from the small diameter bus ring. The assembling property of the rings A to D can be improved.

  (e) The neutral bus ring D to which the common side terminal 23D of each coil 23 is connected is connected to the coil winding portion 22A among the four ring holding portions 24A to 24D provided on the inner surface of the protruding portion 22B of the bobbin 22. It was held in the nearest ring holding part 24D. Therefore, it is not necessary to wire through the common terminals 23D of the coils 23 connected to the neutral bus ring D to the other phase bus rings A to C, thereby improving the assemblability of the bus rings A to D. it can.

  In the modification of FIG. 6, the ring holding portions 24 </ b> A to 24 </ b> D provided at each of the four positions along the gradient direction of the gradient surface of the protruding portion 22 </ b> B of the bobbin 22 are not formed in a groove shape, and a step is formed on the gradient surface on the outer side. It is a flat surface that is connected. Each bus ring D, A, B, C is inserted in order from the outside of the sloped surface of the protruding portion 22B in order from the small-diameter neutral bus ring D, and is supported by itself and / or elastic expansion / contraction deformation of the bobbin 22 The ring holding portions 24D, 24A, 24B, and 24C are held in pressure contact with each other.

  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. The present invention is not limited to DC brushless motors, and can be widely applied to general rotating electrical machines such as DC type and AC type step motors.

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 perspective view showing each bus ring. FIG. 6 is a cross-sectional view showing a modified example of the bobbin.

Explanation of symbols

10 Motor (Rotating electric machine)
13 Stator 21 Core 22 Bobbin 22A Coil winding part 22B Protrusion part 23 Coil 23A-23C Coil connection terminal 23D Common terminal 24A-24D Ring holding part

Claims (5)

A resin bobbin is attached to each of the plurality of 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 electric
A rotating electrical machine characterized in that each bus ring is held by each ring holding portion provided on a bobbin.   The rotating electrical machine according to claim 1, wherein each bus ring is a flat ring.   The rotating electrical machine according to claim 2, wherein the bobbin has a protruding portion protruding from the coil winding portion, and each ring holding portion is provided at four positions along the protruding direction of the inner surface of the protruding portion.   4. The rotating electrical machine according to claim 3, wherein an inner surface of the protruding portion of the bobbin forms an inclined surface that expands in the protruding direction, and each ring holding portion is provided at four positions along the inclined direction of the inclined surface.   The rotating electrical machine according to claim 3 or 4, wherein the neutral bus ring D is held by a ring holding portion closest to a coil winding portion among four ring holding portions provided on an inner surface of the protruding portion of the bobbin.

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