JP2008011653A - Rotating electric machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a resin part from being melted by heating when welding each connection terminal of a coupler to a connection part of a plurality of bus rings resin-molded so as to constitute a terminal.
In a rotating electrical machine 10, each bus ring A to C of a terminal 30 is provided with a heat dissipating part 36 located outside a resin part 31 between a ring main body 32 and a connecting part 34.
[Selection] Figure 2

Description

  The present invention relates to a rotating electrical machine.

In a conventional rotating electrical machine, as described in Patent Document 1, a stator is housed in a housing, resin bobbins are attached to a plurality of cores constituting the stator, and U-phase, V-phase, W The coils of the phases are wound, and the resin portions of the terminals in which the three ring bodies of the three bus rings A to C and the neutral bus ring D are molded by resin are integrally attached to the resin bobbin of the stator. Each of the bus rings A to C of the terminal is connected to each of the U-phase, V-phase, and W-phase coil terminals of the stator, and a neutral bus ring D is connected to the common terminal of each coil. In addition to connecting, the U-phase, V-phase, and W-phase connection terminals of the coupler attached to the housing are connected to the connection portions protruding from the resin portion connected to the ring bodies of the bus rings A to C of the terminal. . The connection between each connection terminal of the coupler and the connection portion of each bus ring is not only bolted but also by welding (welding).
JP2002-171708

  In the prior art, the welding operation of each connection terminal of the coupler and the connection portion of each bus ring is performed by projecting the connection portion of each bus ring arranged in the housing from the ring body in the axial direction of the housing, A terminal is inserted into the housing from a direction orthogonal to the axial direction of the housing, and each connection terminal of the coupler is associated with a connection portion of each bus ring and welded.

  However, the heat generated when the connection terminals of the coupler are welded to the connection portions of the bus rings is transmitted from the connection portions to the ring body, and as a result, the resin portion in which the ring body is molded is heated to melt the resin portion. There is a fear.

  An object of the present invention is to prevent a resin portion from being melted by heating when welding each connection terminal of a coupler to a connection portion of a plurality of bus rings resin-molded so as to constitute a terminal.

  According to the first aspect of the present invention, the stator is housed in the housing, the resin bobbins are attached to 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. The resin part of the terminal in which each ring body of the three bus rings A to C and the neutral bus ring D is molded by resin molding is attached to the resin bobbin of the stator, and the stator U phase, V phase, and W phase Each of the bus rings A to C of the terminal is connected to each coil terminal, a neutral bus ring D is connected to the common terminal of each coil, each coil is star-connected, and the U phase of the coupler attached to the housing, In a rotating electrical machine in which each V-phase and W-phase connection terminal is welded to a connection portion that is connected to the ring body of each bus ring A to C of the terminal and protrudes from the resin portion, Sling A~C is between the connecting portion and the ring body, is provided with a heat radiating portion located outside of the resin portion.

  According to a second aspect of the present invention, the bus ring A to C of the terminal further includes a plate-like piece that is connected to the ring body and protrudes in the axial direction from the resin portion. The base side part with respect to the part is a heat radiating part, and the tip side part of the plate-like piece is a connection part.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the coupler connection terminals are connected to the connection portions of the bus rings A to C in the connection portions of the bus rings A to C. It is provided with positioning means for positioning at a position.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the bus rings A to C of the terminal further include a plate-like piece that protrudes in the axial direction to form a connection portion, and the connection portion of the plate-like piece. A positioning groove serving as the positioning means is provided on the side of the portion, each connecting terminal of the coupler forms a plate-like piece, and a slit of a certain length is formed on the tip side of the plate-like piece, The connection terminals are positioned at the connection positions of the connection portions of the bus rings A to C by fitting the slits of the connection terminals to the groove bottoms of the positioning grooves provided in the plate-like pieces of the bus rings A to C. The tip of the plate-like piece of each connection terminal of the coupler is welded to the plate-like piece of the connection portion of each bus ring A to C.

(Claim 1)
(a) Each bus ring A to C of the terminal is provided with a heat dissipating part located outside the resin part between the ring body and the connecting part. Therefore, before the heat when welding each connection terminal of the coupler to the connection part of each bus ring is transmitted to the ring body, it is radiated by the heat radiating part located outside the resin part, and the resin part is not directly heated. The resin part can be prevented from melting by heating.

(Claim 2)
(b) Each bus ring A to C of the terminal has a plate-like piece that is connected to the ring body and protrudes in the axial direction from the resin portion. Let the tip side part of be a connection part. Therefore, the heat radiating part located outside the resin part is formed in a plate shape having a large surface area, and the required heat radiating performance can be easily secured.

(Claim 3)
(c) Positioning means provided in the connection portion of each bus ring A to C positions each connection terminal of the coupler at a predetermined connection position of the connection portion of each bus ring A to C. Therefore, each connecting terminal of the coupler and the welded portion of each bus ring can be easily assembled at their predetermined connecting positions, and the welding of both can be stabilized, and the assembly workability and welding stability of both can be improved. improves.

(Claim 4)
(d) The slit formed at the tip of the plate-like connection terminal of the coupler is fitted into the plate-like connection portion of each bus ring A to C from the bottom of the positioning groove provided in the plate-like connection portion. The connection terminal of the coupler is guided into the positioning groove provided in the connection portion of each bus ring A to C, and is smoothly positioned at a predetermined connection position of the connection portion.

  FIG. 1 is a sectional view showing a motor, FIG. 2 shows a stator assembly, (A) is a sectional view, (B) is an enlarged view of a main part, FIG. 3 shows a stator assembly, (A) is a front view, (B) is an enlarged view of the main part, FIG. 4 shows a small assembly in which a terminal is attached to the stator, (A) is a cross-sectional view, (B) is an enlarged view of the main part, and FIG. ) Is a cross-sectional view taken along line AA of (B), (B) is an end view, FIG. 6 shows a terminal, (A) is a cross-sectional view, (B) is a front view, and (C) is (A). (D) is an enlarged view of the main part of (B), FIG. 7 shows the bus ring A, (A) is a front view, (B) is a side view, (C) is a plan view, FIG. 8 shows a bus ring B, (A) is a front view, (B) is a side view, (C) is a plan view, FIG. 9 shows a bus ring C, (A) is a front view, and (B) is ( FIG. 10 is a sectional view taken along line B-B in FIG. Sling D is shown, (A) is a front view, (B) is a sectional view taken along line BB in (A), FIG. 11 shows a coupler, (A) is a sectional view, and (B) is a front view. is there.

  As shown in FIG. 1, a DC brushless motor 10 as a rotating electric machine according to the present invention has an end housing 12 attached to one end of a stator assembly 11, and a rotor assembly 13 can be rotated inside the stator assembly 11 and the end housing 12. To support.

  As shown in FIGS. 2 and 3, the stator assembly 11 houses a small assembly of a cylindrical stator 20 and a terminal 30 on the inner periphery of a yoke integral with the housing 11A, and a coupler 40 attached to the housing 11A is connected to the terminal. 30 is configured.

  As shown in FIG. 4, the stator 20 is fitted into the inner periphery of the housing 11A. In this embodiment, for example, four (total 12) core subassemblies 20A for each of the U phase, V phase, and W phase. Are arranged adjacent to each other on the circumference. As shown in FIG. 5, the core subassembly 20 </ b> A includes a plurality of cores 21 made of a plurality of silicon steel plates, a resin bobbin 22 attached to the laminated core 21, and a U-phase on the coil winding portion 22 </ b> A of the resin bobbin 22. Each motor coil 23 having three phases of V phase and W phase is wound. Each motor coil 23 has both ends of a winding start end and a winding end as a coil terminal 23A and a common terminal 23B, respectively, and these terminals 23A and 23B are outward from one end side of the coil winding portion 22A of the resin bobbin 22. Extend. The resin bobbin 22 includes a terminal mounting portion 22B (concave portion) protruding in the axial direction of the housing 11A along the inner periphery of the housing 11A on one end side of the coil winding portion 22A (FIG. 6C).

  As shown in FIG. 6, the terminal 30 is formed by embedding and integrating the ring bodies 32 of the three bus rings A to C and the neutral bus ring D into a resin portion 31 formed by resin molding. By attaching the attachment claws 31A provided at a plurality of locations to the recesses of the terminal attachment portion 22B of the resin bobbin 22, the attachment claws 31A are positioned and attached to the resin bobbin 22 in the circumferential direction, the axial direction, and the radial direction. The ring main body 32 of the bus rings A to C has a C shape and a part in the circumferential direction is missing, and the ring main body 32 of the neutral bus ring D forms an annular shape that is continuous in the circumferential direction.

  As shown in FIGS. 7 to 10, each of the bus rings A to D is connected to the ring main body 32, extends outward in the radial direction of the ring main body 32, and protrudes to the outside of the resin portion 31. Is provided. In this embodiment, the bus ring A includes four terminal portions 33 to which the coil terminals 23A of the four U-phase motor coils 23 are connected. In this embodiment, the bus ring B includes four terminal portions 33 to which the coil terminals 23A of the four V-phase motor coils 23 are connected. In the present embodiment, the bus ring C includes four terminal portions 33 to which the coil terminals 23A of the four W-phase motor coils 23 are connected. The neutral bus ring D includes twelve terminal portions 33 to which common terminals 23B of all twelve motor coils 23 are connected in the present embodiment. Accordingly, each of the terminal portions 33 protruding from the resin portion 31 connected to the ring main body 32 of each of the bus rings A to C of the terminal 30 to the coil terminals 23A of the U-phase, V-phase, and W-phase motor coils 23 of the stator 20. Are connected to the common terminal 23B of each motor coil 23, and a terminal portion 33 connected to the ring body 32 of the neutral bus ring D and protruding from the resin portion 31 is connected to each other, and each motor coil 23 is star-connected.

  In each bus ring A to D, the terminal portion 33 includes a tip recess 33B sandwiched between the tip claws 33 and having a U-shaped contour as shown in FIG. 6D. The terminals 23A and 23B of each motor coil 23 are assembled so as to be fitted in the tip recesses 33B of the terminal portions 33 of the corresponding bus rings A to D, and are clamped between the tip claws 33A of the terminal portions 33. And welded to the terminal portion 33.

  As shown in FIGS. 7 to 9, each of the bus rings A to C is connected to the ring main body 32, and is bent from one end in the circumferential direction of the ring main body 32 to be bent in a direction perpendicular to the axis of the ring main body 32. The connection part 34 for the external connection which protrudes outside the 31 is provided. In the terminal 30, all three connection portions 34 of the bus rings A to C are arranged in parallel to each other (FIG. 6B).

  As shown in FIG. 11, the coupler 40 includes a U-phase, V-phase, and W-phase connection terminal 42 connected to an external control circuit in a resin body 41 screwed to the outer surface of the housing 11A. The U-phase, V-phase, and W-phase connection terminals 42 of the coupler 40 are inserted into the housing 11 </ b> A and connected to the connection portions 34 of the bus rings A to C of the terminal 30. As will be described later, each connection terminal 42 is inserted into each connection portion 34 to meet and weld.

  The motor 10 includes a resolver 50 including a resolver rotor portion 51 and a resolver stator portion 52. That is, the resolver rotor 51 that rotates together with the rotation shaft 13A is attached to the outer periphery of the rotation shaft 13A of the rotor assembly 13. Further, the resolver stator portion 52 is attached to the stator 20 side, in other words, the inner periphery of the end housing 12. The resolver stator unit 52 is disposed so as to surround the resolver rotor unit 51, and detects the rotational position of the rotating shaft 13A by a change in reluctance generated between the resolver stator unit 52 and the resolver rotor unit 51. In accordance with the detected rotational position of the rotating shaft 13A, an external control circuit applies a predetermined pattern of current to the U-phase, V-phase, and W-phase motor coils 23 of the stator 20 via the coupler 40 and the terminal 30. The motor 10 is supplied and controlled.

  However, in the motor 10, the terminal 30 is caused by heat generated when the connection terminals 42 of the coupler 40 are welded to the connection portions 34 of the plurality of bus rings A to C which are resin-molded so as to constitute the terminal 30. In order to prevent the resin part 31 from melting, it has the following configuration.

  In the terminal 30, each of the bus rings A to C is located outside the resin portion 31 between the ring body 32 and the connection portion 34 molded in the resin portion 31 as shown in FIGS. 2 to 4. A heat dissipating part 36 exposed outside 31 is provided. At this time, as shown in FIGS. 6 to 9, each of the bus rings A to C has the ring main body 32 in a C plate shape and is bent from one end in the circumferential direction of each ring main body 32 in the direction perpendicular to the axis of the ring main body 32. It has a plate-like piece 35 that rises and protrudes outward in the axial direction from the resin portion 31. The terminal 30 is a heat radiating portion that is elongated by extending a base portion of the plate-shaped piece 35 with respect to the resin portion 31 in the radial direction of the ring body 32 among the plate-shaped pieces 35 of the bus rings A to C. 36. Further, a small piece on the lower end side of the tip end portion of the plate-like piece 35, that is, in this embodiment, protrudes outward in the axial direction of the ring main body 32 from the radial center side end of the ring main body 32 in the plate-like piece 35. The portion is referred to as a connection portion 34. The terminal 30 is provided with a positioning portion 37 to be described later for the connection terminal 42 of the coupler 40 on the upper end of the plate-like piece 35.

  Accordingly, as shown in FIGS. 2 and 3, each connection terminal 42 of the coupler 40 protrudes outward in the axial direction from the resin portion 31 via the heat radiating portion 36 in each bus ring A to C of the terminal 30. Meeting and welding to the connecting portion 34.

According to the present embodiment, the following operational effects can be obtained.
(a) Each bus ring A to C of the terminal 30 is provided with a heat radiating portion 36 located outside the resin portion 31 between the ring main body 32 and the connecting portion 34. Therefore, before the heat when the connection terminals 42 of the coupler 40 are welded to the connection portions 34 of the bus rings A to C is transmitted to the ring body 32, the heat is dissipated by the heat dissipation portion 36 located outside the resin portion 31. It is possible to easily prevent the resin portion 31 from melting and scattering without being stored in the resin portion 31.

  (b) Each of the bus rings A to C of the terminal 30 has a plate-like piece 35 that is connected to the ring body 32 and protrudes in the axial direction from the resin portion 31, and radiates the base side portion of the plate-like piece 35 with respect to the resin portion 31. A portion 36 is provided, and a tip side portion of the plate-like piece 35 is a connection portion 34. Therefore, the heat radiation part 36 located outside the resin part 31 is formed in a plate shape having a large surface area, and the required heat radiation performance can be easily ensured.

  Next, in the motor 10, the connection terminals 42 of the coupler 40 and the connection portions 34 of the bus rings A to C of the terminal 30 are easily associated at their connection positions to stabilize the welding of the two. Therefore, the following configuration is provided.

  As shown in FIGS. 2 to 4, in the terminal 30, each of the bus rings A to C has a positioning portion for positioning each connection terminal 42 of the coupler 40 at a connection position with the connection portion 34. 37 is provided. At this time, each of the bus rings A to C has a plate-like piece 35 that protrudes in the axial direction to form a connection portion 34 as described above with reference to FIGS. 6 to 9, and the connection portion 34 of the plate-like piece 35. In the present embodiment, a positioning portion 37 is provided on the side of the connecting portion 34 on the upper side of the connecting portion 34 via the gap portion 38, and is opened in a tapered shape above the positioning portion 37 (the end surface facing the coupler 40). Positioning groove 37A is provided. The connecting portion 34 and the positioning portion 37 are flush with the heat radiating portion 36 described above. On the other hand, as shown in FIG. 11, each connection terminal 42 of the coupler 40 forms a strip-like plate-like piece 43 and is fixed to a bifurcated tip fork portion 43 </ b> A formed on the tip side of the plate-like piece 43. A long slit 43B is formed.

  Accordingly, by fitting the slit 43B of the tip fork portion 43A of each connection terminal 42 of the coupler 40 into the groove bottom portion of the positioning groove 37A provided in the plate-like piece 35 of each bus ring A to C of the terminal 30, each The connection terminal 42 is positioned in three directions orthogonal to each other in the axial direction, the axis perpendicular direction, and the radial direction of the terminal 30, and as a result, each connection terminal 42 is placed at a predetermined connection position of the connection portion 34 of each bus ring A to C. Position. In this embodiment, the tip fork portion 43A of the plate-like piece 43 of each connection terminal 42 of the coupler 40 is replaced with the plate-like piece 35 of the positioning portion 37 of each bus ring A to C, as shown in FIGS. The gap portion 38 between the portion 37 and the connection portion 34 (becomes an air-cooling heat dissipation portion of the connection portion 34 to which the tip fork portion 43A of the connection terminal 42 is welded), and further sandwiching the plate-like piece 35 of the connection portion 34, The tip fork portion 43A of the plate-like piece 43 of the connection terminal 42 is welded to the plate-like piece 35 of the connection portion 34 of each bus ring AC.

According to the present embodiment, the following operational effects can be obtained.
(a) The positioning portion 37 provided in the connection portion 34 of each bus ring A to C positions each connection terminal 42 of the coupler 40 at a predetermined connection position with the connection portion 34 of each bus ring A to C. Accordingly, the connection terminals 42 of the coupler 40 and the welded portions of the bus rings can be easily associated at their connection positions, so that the welding of both can be stabilized, and the assembly workability and weldability of both can be improved. improves.

  (b) The slit 43B formed at the tip of the plate-like connection terminal 42 of the coupler 40 is formed in the plate-like connection portion 34 of each bus ring A to C, and the groove bottom portion of the positioning groove 37A provided in the plate-like connection portion 34. Fit from. The connection terminal 42 of the coupler 40 is guided to the positioning groove 37A provided in the connection portion 34 of each bus ring A to C, and is smoothly positioned at the connection position with the connection portion 34.

  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. 2A and 2B show a stator assembly, in which FIG. 2A is a cross-sectional view and FIG. 3A and 3B show a stator assembly, in which FIG. 3A is a front view and FIG. 4A and 4B show a small assembly in which a terminal is attached to a stator. FIG. 4A is a sectional view, and FIG. FIG. 5 shows a core assembly, (A) is a cross-sectional view taken along line AA of (B), and (B) is an end view. 6A and 6B show a terminal, in which FIG. 6A is a cross-sectional view, FIG. 6B is a front view, FIG. 6C is an enlarged view of a main part of FIG. 7 shows the bus ring A, (A) is a front view, (B) is a side view, and (C) is a plan view. FIG. 8 shows the bus ring B, (A) is a front view, (B) is a side view, and (C) is a plan view. 9A and 9B show the bus ring C, where FIG. 9A is a front view and FIG. 9B is a sectional view taken along line BB in FIG. FIG. 10 shows the bus ring D, (A) is a front view, and (B) is a sectional view taken along line BB in (A). FIG. 11 shows a coupler, in which (A) is a cross-sectional view and (B) is a front view.

Explanation of symbols

10 Motor (Rotating electric machine)
11A Housing 20 Stator 21 Core 22 Resin bobbin 22A Coil winding part 23 Coil 23A Coil terminal 23B Common terminal 30 Terminal 31 Resin part 32 Ring body 33 Terminal part 34 Connection part 35 Plate-shaped piece 36 Heat radiation part 37 Positioning part (Positioning means) )
37A Positioning groove 40 Coupler 42 Connection terminal 43 Plate-like piece 43B Slit AD Bus ring

Claims (4)

A stator is housed in a housing, resin bobbins are attached to a plurality of cores constituting the stator, and coils of U phase, V phase, and W phase are wound around coil winding portions of each bobbin
The resin part of the terminal in which the ring bodies of the three bus rings A to C and the neutral bus ring D are integrally molded by resin is attached to the resin bobbin of the stator.
Each of the terminal bus rings A to C is connected to the U-phase, V-phase, and W-phase coil terminals of the stator, and the neutral bus ring D is connected to the common terminal of each coil, and the coils are star-connected. With
In the rotating electrical machine formed by welding the U-phase, V-phase, and W-phase connection terminals of the coupler attached to the housing to the connection portion protruding from the resin portion connected to the ring body of each bus ring A to C of the terminal,
A rotating electric machine characterized in that each of the bus rings A to C of the terminal is provided with a heat radiating portion located outside the resin portion between the ring main body and the connecting portion.   Each of the bus rings A to C of the terminal has a plate-like piece that is connected to the ring body and protrudes in the axial direction from the resin portion, and a base side portion with respect to the resin portion of the plate-like piece is a heat radiating portion, and the tip of the plate-like piece The rotating electrical machine according to claim 1, wherein the side portion is a connection portion.   The connection part of each bus ring A-C of the said terminal was equipped with the positioning means which positions each connection terminal of a coupler in the connection position with the connection part of each bus ring A-C. The rotating electrical machine described. Each of the bus rings A to C of the terminal has a plate-like piece that protrudes in the axial direction to form a connecting portion, and a positioning groove that serves as the positioning means is located on the side of the portion that becomes the connecting portion of the plate-like piece. Prepared,
Each connecting terminal of the coupler forms a plate-like piece, and a slit of a certain length is formed on the tip side of the plate-like piece,
By fitting the slit of each connection terminal of the coupler to the groove bottom of the positioning groove provided on the plate-like piece of each bus ring A to C, each connection terminal is connected to the connection part of each bus ring A to C. To position,
The rotating electrical machine according to claim 3, wherein the tip end portion of the plate-like piece of each connection terminal of the coupler is welded to the plate-like piece of the connection portion of each bus ring A to C.

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