JP5579241B2 - Rotating electric machine - Google Patents

Description

  The present invention relates to a rotating electrical machine in which an external connection terminal extending from a wiring component of a rotating electrical machine and a connection terminal provided on a terminal block fixed to a housing are electrically connected.

In recent years, electric vehicles and hybrid vehicles equipped with an electric motor as a driving force source for vehicles have attracted attention in terms of improving fuel efficiency.
In this electric motor, which is a driving source of an automobile, a power supply terminal derived from a wiring component for Y or Δ connection of a stator winding is often directly connected to an external wiring via a terminal block.

However, depending on the arrangement direction of the external wiring, the power supply terminal becomes long. In this case, the power supply terminal may approach other electrical parts due to vibrations or the like, resulting in insulation failure.
And in order to avoid such a situation, what connected the connection terminal supported by the terminal block between the electric power feeding terminal and external wiring is known.

  In this case, it is necessary to electrically join the tip of the connection terminal and the tip of the power supply terminal by welding or the like, but due to the tolerance of each part during assembly, the axial length of the stator Variations in dimensions occur. And, since the tip of the connection terminal and the tip of the power supply terminal are joined without matching, for example, the strength at the joint is reduced by using it for a long time under severe vibration conditions. is there.

  As a measure to solve the above problem, for example, by forming a bent portion bent in a crank shape in a part of the connection terminal between the power supply terminal drawn out from the stator and the terminal block, the axial direction of the stator There is known an electric motor that absorbs the variation of the length dimension (for example, see Patent Document 1).

JP 2007-31123 A

  However, the above-mentioned Patent Document 1 has a problem in that the number of times of bending a sheet metal is increased in order to form a bent portion having a complicated shape in the connection terminal, resulting in an increase in manufacturing cost.

  An object of the present invention is to solve such a problem, and the positions of the front end portion of the connection terminal and the front end portion of the external connection terminal due to the variation in the axial length of the stator. It is an object of the present invention to obtain a rotating electrical machine that can eliminate the deviation with a simple configuration.

A rotating electrical machine according to the present invention includes a stator iron core, a stator winding wound around the stator iron core, and a stator having a wiring component for Y- or Δ-connection of the stator winding;
A rotor provided rotatably on the inner diameter side of the stator;
A housing containing the rotor and the stator;
A terminal block fixed to the housing;
A connection terminal provided on the terminal block, electrically connected to the distal end portion of the external connection terminal of the connection component, wherein the proximal end portion is connected to the external wiring and the distal end portion extends in the axial direction of the stator; A rotating electrical machine comprising:
The connection terminal is bent so that a portion on the base end side and a portion on the tip end side are parallel to each other,
The terminal block has a fixed portion that restricts movement of the connection terminal other than in the axial direction,
It said connection terminal, the end surface of the tip to move along the axial direction is guided by the fixing portion is adapted to match the end faces of the previous end of the feed current terminals.

  According to the rotating electrical machine according to the present invention, the terminal block has a fixed portion that restricts movement of the connection terminal in a direction other than the axial direction, and the connection terminal is guided by the fixed portion and moves along the axial direction. Therefore, the end surface of the connection terminal and the front end portion of the power supply terminal are caused by the variation in the axial length of the stator. Can be eliminated with a simple configuration.

It is the sectional side view which cut | disconnected the well-known electric motor along the axial direction. It is principal part sectional drawing which shows the electric motor of Embodiment 1 of this invention. It is a principal part perspective view of FIG. It is a figure when FIG. 3 is seen along arrow A. It is arrow sectional drawing along the VV line of FIG. It is principal part sectional drawing of FIG. It is a perspective view which shows the connection terminal of FIG. It is principal part sectional drawing of the electric motor of Embodiment 2 of this invention. It is a perspective view which shows the connection terminal of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings, the same or equivalent members and parts will be described with the same reference numerals.

Embodiment 1 FIG.
FIG. 1 is a side sectional view of an electric motor, which is a driving source of an automobile, cut along an axial direction.
This electric motor, which is a known rotating electric machine, includes a stator 1 fitted to a ring 2, a rotor 7 that is rotatably provided on the inner diameter side of the stator 1, and the rotor 7 and the stator 1. And a housing composed of a first housing part 4 and a second housing part 6 housed therein.
The stator 1 has a stator core, a stator winding wound around the stator core, and a connection component 8 for Y- or Δ-connection of the stator winding.
Both ends of the rotor 7 are rotatably supported by a first bearing 3 provided in the first housing part 4 and a second bearing 5 provided in the second housing part 6.

2 is an enlarged cross-sectional view of a main part showing the electric motor according to Embodiment 1 of the present invention, FIG. 3 is a perspective view of the main part of FIG. 2, and FIG. 4 is a view when FIG. 5 is a cross-sectional view taken along the line VV in FIG. 4, and FIG. 6 is a cross-sectional view of the main part of FIG.
The second housing part 6 is formed with a terminal block fixing part 11 opened to the outside. A resin terminal block 12 is attached to the terminal block fixing portion 11 with screws (not shown).
This terminal block 12 is used for fastening the external wiring 21 to the base end portion of the connection terminal 13 by using a fixing portion 16 that holds the connection terminals 13 for U phase, V phase, and W phase, and bolts 23. And a pedestal portion 20 in which a nut 22 is embedded.

Each connection terminal 13 is electrically connected to the distal end portion of the power supply terminal 9, which is an external connection terminal whose distal end portion extends in the axial direction of the stator 1, at the joint portion 10.
The connection terminal 13 has a first bent portion 14 and a second bent portion 15 at the intermediate portion so that the proximal end portion and the distal end portion are parallel to each other. It is bent 90 °.
A long hole 24 having a long diameter is formed in the base end portion of the connection terminal 13 in the axial direction of the rotor 7. A portion of the connection terminal 13 on the tip end side is in surface contact with the power supply terminal 9.
The proximal end side of the connection terminal 13 is the outside in the radial direction of the electric motor, and the distal end side is the inside in the radial direction of the electric motor.

  The fixing portion 16 of the terminal block 12 includes a side wall portion 18 extending on both sides along the base end portion side of the connection terminal 13 and a protruding portion 17 protruding from the side wall portion 18 so as to face each other. . The fixing portion 16 that surrounds the base end portion of the connection terminal 13 enables the connection terminal 13 to move only in the direction along the axial direction of the stator 1 and restricts movement in other directions. .

The connection terminal 13 has a plurality of protrusions 25 on the surface facing the protrusion 17. The connection terminal 13 is temporarily fixed to the terminal block 12 by an elastic force generated by the protrusion 25 and elastically deformed.
Note that the protruding portion 25 may be formed on the protruding portion 17 of the fixing portion 16.

  The connection terminal 13 moves in the axial direction so that the end surface of the front end portion of the connection terminal 13 coincides with the end surface of the front end portion of the power supply terminal 9, and bolts 23 are inserted into the nuts 22 embedded in the pedestal portion 20 through the long holes 24. Are fixed to the terminal block 12.

In the electric motor having the above configuration, the external wiring 21 is electrically connected to the stator 1 in the following procedure.
First, the base end side portion of the connection terminal 13 is inserted into the fixing portion 16. At this time, the projecting portion 25 of the connection terminal 13 comes into contact with the protruding portion 17 of the fixed portion 16, the connection terminal 13 is elastically deformed around the second bent portion 15, and the connection terminal 13 is elastically deformed to the terminal block 12. On the other hand, it is temporarily fixed.
In this state, if the positions of the tip of the connection terminal 13 and the tip of the power supply terminal 9 do not match, the connection terminal 13 is moved in the axial direction of the rotor 7 to match, and then welding is performed. By doing so, it is possible to stabilize the molten state at the distal end portion of the connection terminal 13 and the distal end portion of the power supply terminal 9 and obtain a sufficient bonding strength.
Finally, the bolt 23 is screwed to the nut 22 through the elongated hole 24 of the connection terminal 13, the connection terminal 13 is fixed to the terminal block 12, and the external wiring 21 is electrically connected to the connection terminal 13. The external wiring 21 is electrically connected to the stator 1, and power can be supplied to the stator winding through the external wiring 21, the connection terminal 13, and the connection component 8.

  Therefore, even when there is variation in the position of the tip of the power supply terminal 9 due to the tolerance of each part during assembly, the connection terminal 13 guided in the axial direction by the fixed portion 16 is moved. The end surface of the front end portion of the connection terminal 13 can be easily aligned with the end surface of the front end portion of the power supply terminal 9, and the joint portion 10 is formed in which the front end portions are firmly joined to each other.

  In addition, the connection terminal 13 is bent at the first bent portion 14 and the second bent portion 15 so that the portion on the proximal end side and the portion on the distal end side are parallel to each other. Therefore, the movement distance in the axial direction of the end face of the distal end portion of the connection terminal 13 and the movement distance in the axial direction of the end face of the proximal end portion of the connection terminal 13 coincide with each other. It can be smoothly fixed in position.

  Further, since the long hole 24 is formed on the side opposite to the joint portion 10 via the fixing portion 16, when the bolt 23 is screwed to the nut 22 through the long hole 24 of the connection terminal 13, the fixing portion 16 is The connection terminal 10 is prevented from rotating, unnecessary stress is not generated in the joint 10, and the joint strength at the joint 10 is ensured.

  Further, since the connection terminal 13 is temporarily fixed to the terminal block 12 by the elastic force generated by the protrusion 25 and caused by elastic deformation, the end surface of the front end of the connection terminal 13 is attached to the end surface of the power supply terminal 9. The workability of matching is improved, and the workability of screwing the bolt 23 to the nut 22 through the long hole 24 of the connection terminal 13 is also improved.

  Moreover, although it is necessary to ensure the insulation distance between the connection terminals 13 of the adjacent U-phase, V-phase, and W-phase, the connection terminals 13 of each phase are surrounded by an insulating fixing portion 16. As a result, the creepage distance between adjacent connection terminals 13 is increased, and the insulation between the connection terminals 13 to which a high voltage is applied is ensured more reliably.

  In addition, since the tip of the connection terminal 13 that extends in the axial direction from the terminal block 12 is inside the radial direction of the electric motor, depending on the type of electric motor, the electric motor may be used for the tip of the connection terminal 13 protruding in the axial direction. There is no need to lengthen the length in the axial direction.

  Further, the long hole 24 of the connection terminal 13 has a long diameter in the axial direction of the stator 1, and even if the connection terminal 13 moves in the axial direction, the long hole 24 faces the nut 22 and uses the bolt 23. Thus, the connection terminal 13 can be easily fixed to the pedestal portion 20.

Embodiment 2. FIG.
FIG. 8 is a cross-sectional view of an essential part of the electric motor according to Embodiment 2 of the present invention, and FIG. 9 is a perspective view showing the connection terminal 13 of FIG.
In this embodiment, the connection terminal 13 has a plurality of wave portions 26 formed on the surface facing the protruding portion 17 along the axial direction of the rotor 7. The connection terminal 13 is temporarily fixed to the terminal block 12 by an elastic force generated by the wave portion 26 and elastically deformed.
Other configurations are the same as those of the electric motor of the first embodiment.
Also for the electric motor of this embodiment, the same effect as the electric motor of the first embodiment can be obtained.
The wave portion 26 may be formed on the protruding portion 17 of the fixed portion 16.

In each of the above embodiments, the electric motor serving as the drive source of the electric vehicle has been described as the rotating electric machine. However, the present invention can also be applied to a generator.
Needless to say, the means for fixing the connection terminal 13 to the terminal block 12 is not limited to the bolt 23 and the nut 22.

  DESCRIPTION OF SYMBOLS 1 Stator, 2 Ring, 3 1st bearing, 4 1st housing part, 5 2nd bearing, 6 2nd housing part, 7 Rotor, 8 Connection components, 9 Feeding terminal (external connection terminal), DESCRIPTION OF SYMBOLS 10 Joint part, 11 Terminal block fixing | fixed part, 12 Terminal block, 13 Connection terminal, 14 1st bending part, 15 2nd bending part, 16 fixing | fixed part, 17 Projection part, 18 Side wall part, 20 Base part, 21 External wiring, 22 Nut, 23 Bolt, 24 Long hole, 25 Projection, 26 Wave part.

Claims (6)

A stator core, a stator winding wound around the stator core, and a stator having a wiring component for Y- or Δ-connection of the stator winding;
A rotor provided rotatably on the inner diameter side of the stator;
A housing containing the rotor and the stator;
A terminal block fixed to the housing;
A connection terminal provided on the terminal block, electrically connected to the distal end portion of the external connection terminal of the connection component, wherein the proximal end portion is connected to the external wiring and the distal end portion extends in the axial direction of the stator; A rotating electrical machine comprising:
The connection terminal is bent so that a portion on the base end side and a portion on the tip end side are parallel to each other,
The terminal block has a fixed portion that restricts movement of the connection terminal other than in the axial direction,
It said connection terminal, rotation and an end face of the tip to move along the axial direction is guided by the fixing portion is adapted to match the end faces of the previous end of the feeding current terminals Electric.   The said fixing | fixed part is comprised from the side wall part each provided in the both sides along the said connection terminal, and the protrusion part which protruded mutually opposed from this side wall part, It is characterized by the above-mentioned. Rotating electric machine.   A protrusion is formed on one of the surfaces of the connection terminal and the protrusion that face each other, and the connection terminal is elastically generated by the protrusion and elastically deformed to generate the terminal block. The rotating electrical machine according to claim 1, wherein the rotating electrical machine is temporarily fixed to the rotating electrical machine.   A plurality of wave portions extending in the axial direction are formed on one of the surfaces of the connection terminal and the projecting portion facing each other, and the connection terminal is elastically deformed by the wave portion. The rotating electrical machine according to claim 1, wherein the rotating electric machine is temporarily fixed to the terminal block by an elastic force generated by the rotating electric machine. A long hole with a long diameter is formed in the axial direction at the base end of the connection terminal,
A nut facing the elongated hole is embedded in the terminal block,
5. The connection terminal according to claim 1, wherein the connection terminal is fixed to the terminal block by screwing a bolt to the nut through the elongated hole, and is connected to the external wiring. The rotating electrical machine described.   The rotating electrical machine according to claim 1, wherein the rotating electrical machine is an electric motor that is a drive source of an automobile.

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