JP2017200268A - Connection method for feeding parts - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection method for feeding parts capable of absorbing variation in a component dimension or an assembly dimension of a connection part between a bus bar feeding part and a terminal of a terminal block.SOLUTION: A connection method includes: a tabular bus bar feeding part 5 which is connected to phases of a coil part of a stator and pulled out in an axial direction of the stator; a terminal block 6 held by a stator case 1 and including a feeding terminal for supplying power from the outside; and a tabular terminal 8 which has one end electrically connected with the feeding terminal of the terminal block 6 and the other end connected to the bus bar feeding part 5. In a connection part of the terminal 8 with the bus bar feeding part 5, a fitting part 8a which is fitted with the bus bar feeding part 5 without a gap in a radial direction of the stator and has a clearance in a peripheral direction. The bus bar feeding part 5 is fitted to the fitting part 8a, and both the bus bar feeding part and the fitting part are connected while further axially projecting a distal end side from the fitting part 8a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for connecting a power feeding unit that connects a lead conductor portion drawn from an electrical device and a power feeding terminal unit.

As a conventional technique related to a connection part of a power supply unit, for example, a lead conductor part drawn out from a coil end of a motor generator that is an electric device, and a power supply in which a power supply line is connected with a space from the lead conductor part A connecting member for connecting the terminal block and the lead conductor portion and the terminal of the power supply terminal block, the connecting member having a bent portion bent in a U shape in the middle thereof, and the lead conductor portion by the bent portion A connection structure of a power feeding unit that absorbs a positional deviation between the power feeding terminal block and the power feeding terminal block is disclosed (for example, see Patent Document 1).

JP 2007-31123 A (page 7-8, FIG. 3)

  In the connection structure of the power feeding part as shown in Patent Document 1, only one direction can be displaced with respect to the bent part, and it is difficult to sufficiently absorb the variation in the mounting dimension in the two directions perpendicular thereto. Therefore, it is necessary to increase the accuracy of parts and assembly in directions other than the misalignment absorption direction, which increases costs. Further, since the bending portion has lower rigidity than other portions, there is a problem that it is difficult to provide vibration resistance as a system.

  The present invention has been made to solve the above-described problems, and is a power supply unit that can absorb variations in component dimensions and assembly dimensions when connecting a bus bar power supply unit, which is a lead conductor, and a terminal block terminal. The purpose is to obtain a connection method.

  A method for connecting a power feeding unit according to the present invention is a method for connecting a power feeding unit that feeds power to a winding portion of a stator of a rotating electrical machine from the outside, and is connected to each phase of the winding portion and drawn out in the axial direction of the stator. A plate-shaped bus bar power supply unit, a terminal block having a power supply terminal and held in the case of the stator, and a plate-shaped terminal connected to the power supply terminal of the terminal block and one connected to the bus bar power supply unit A fitting portion having a clearance with respect to the radial direction of the stator and having a clearance with respect to the circumferential direction is provided at the connection portion of the terminal with the bus bar power feeding portion, and the bus bar power feeding portion is fitted. The terminal is fixed to the bus bar power feeding portion in a state where the fitting portion is fitted and the tip side is further protruded in the axial direction from the fitting portion.

  According to the connection method of the power feeding portion of the present invention, the fitting with the bus bar power feeding portion without any gap in the radial direction of the stator and the clearance in the circumferential direction is fitted in the connection portion with the bus bar power feeding portion of the terminal. Since the terminal is fixed to the bus bar power feeding part in a state where the bus bar power feeding part is fitted to the fitting part and the tip side protrudes further in the axial direction from the fitting part, the bus bar power feeding part and the terminal block Even when a positional deviation occurs with the terminal due to variations in the components themselves or mounting positions, the positional deviation in the axial direction and the circumferential direction can be absorbed. Therefore, a highly reliable connection structure of the power feeding unit can be obtained.

It is a perspective view which shows the stator part of the motor with an integrated inverter to which the connection method of the electric power feeding part by Embodiment 1 of this invention is applied. It is an enlarged front view of the electric power feeding connection part of FIG. It is an expansion perspective view of the electric power feeding connection part of FIG. It is a figure which shows the other example of the terminal fitting part of the connection method of the electric power feeding part by Embodiment 1 of this invention. It is a side view of the connection part which shows the connection method of the electric power feeding part by Embodiment 2 of this invention. It is a front view which shows the connection part of the terminal of the connection method of the electric power feeding part by Embodiment 3 of this invention. It is a side view which shows the connection part of the terminal of the connection method of the electric power feeding part by Embodiment 4 of this invention.

Embodiment 1 FIG.
Embodiment 1 of the present invention will be described below with reference to FIGS. In the following embodiment, an inverter-integrated motor will be described as an example of a rotating electrical machine to which the power feeding unit connection method is applied, but the present invention is not limited to this.
FIG. 1 is a perspective view showing a stator portion of an inverter-integrated motor. FIG. 2 is an enlarged front view of a connecting portion for supplying power to the winding portion of the stator, and FIG. 3 is an enlarged perspective view. 2 and 3 are views seen in the direction A of FIG.

As shown in FIG. 1, the stator portion is arranged on the inner peripheral side of a circular stator case 1, and winding portions 3 formed by winding coils around a plurality of teeth portions of the stator core 2 are arranged at equal intervals on the inner periphery. It is formed in an annular shape. A bus bar power supply portion 5 for three phases that is electrically connected to the bus bar 4 drawn from the winding portion 3 and supplies power to the winding portion 3 is drawn in the axial direction of the stator.
A terminal block 6 is held on the outer peripheral surface of the stator case 1. One of the terminal blocks 6 is provided with a connection terminal 7 to which a power supply line from the outside, in this embodiment, a connection line with an inverter is connected, and the other is electrically connected to the connection terminal 7 to supply power to the bus bar. A plate-like terminal 8 connected to the unit 5 is provided.

Next, the shape of the connection part between the bus bar power supply part 5 and the terminal 8 will be described with reference to FIGS. The cross-sectional shape of the bus bar power feeding portion 5 is a rectangular shape, and is arranged so that the plate thickness direction is the radial direction of the stator and the width direction is the circumferential direction.
The three-phase terminals 8 are led out from the terminal block 6 in the axial direction of the stator, and are bent at a right angle toward the center in the middle, and the tip thereof is orthogonal to the bus bar power feeding portion 5 to form a connection portion. ing.

In order to form a connection portion, a fitting portion 8 a into which the bus bar power feeding portion 5 is fitted is provided at the tip portion of the terminal 8. The shape of the fitting portion 8a may be a rectangular fitting hole having a short side substantially the same as the plate thickness of the plate-like bus bar power supply portion 5, but in FIGS. A case is shown in which a U-shaped notch is formed.
In any case, the fitting portion 8a is fitted with the bus bar power feeding portion 5 with no gap in the radial direction of the stator and has a clearance in the circumferential direction.

As shown in FIG. 3, in a state where the bus bar power feeding portion 5 is fitted to the fitting portion 8 a, the front end side of the bus bar power feeding portion 5 protrudes in the axial direction of the stator from the surface of the fitting portion 8 a of the terminal 8. It is configured.
By mechanically fitting the bus bar power supply part 5 and the terminal 8 with a clearance in the circumferential direction and with the front end side of the bus bar power supply part 5 projecting in the axial direction with respect to the terminal 8,・ Electrically connected and fixed.

  The connection terminal 7 connected to the inverter is required to have positional accuracy. In particular, in the case of an inverter-integrated motor, the position of the connection terminal 7 connected to the inverter is extremely important. Therefore, it is necessary to assemble the terminal block 6 to the stator case 1 with reference to the position of the connection terminal 7, and as a result, the variation in the relative position becomes large in the connection portion between the terminal 8 and the bus bar power feeding portion 5. In the present embodiment, as described above, a circumferential clearance is provided between the terminal 8 and the bus bar power supply unit 5 and the bus bar power supply unit 5 is projected in the axial direction, thereby preventing variations in position in two directions. Thus, it is possible to absorb the positional deviation.

In FIGS. 2 and 3, the fitting portion 8a of the terminal 8 has a shape in which a U-shaped notch is formed in advance at the tip of the terminal 8. Next, another method for forming the fitting portion 8a will be described. I will explain.
FIG. 4 is a diagram showing another example of the fitting portion 8a, and shows a case where the fitting portion 8a is formed by caulking. As shown in FIG. 4, a crimping portion 8b is formed at the tip of the terminal 8, and after being combined with the bus bar power feeding portion 5, the crimping portion 8b is bent as shown by an arrow to form a fitting portion 8a. The bus bar power supply unit 5 is sandwiched and fitted into 8a, and the crimping unit 8b is caulked and fixed.

  For example, as shown by a two-dot chain line in FIG. 4, the caulking portion 8 b is formed by extending one side portion of the connection portion of the terminal 8 from the contact surface 8 c with the bus bar power feeding portion 5. If the weakened portion 8d having a reduced cross-sectional area is provided in the crimped portion 8b and bent from the minimum cross-sectional area as a starting point, the force required for the caulking is reduced, which leads to downsizing of equipment and jigs. Equipment costs can be reduced. By providing the starting point of the fragile portion 8d at a position t + α (α is a minute dimension) from the contact surface 8c with respect to the plate thickness t of the bus bar power supply portion 5, the force required for crimping can be further reduced. Note that providing the circumferential clearance in the fitting portion 8a is the same as in FIGS.

  When the shape of the fitting portion 8a of the terminal 8 is formed in a U-shape in advance as shown in FIGS. 2 and 3, the access direction of the terminal block 6 to the bus bar power feeding portion 5 when the terminal block 6 is assembled However, although it is limited to the circumferential direction or the axial direction, if the caulking structure as shown in FIG. 4 is used, the accelerator from the radial direction becomes easy and the assembling property is improved. In addition, since the fragile portion 8d is provided, caulking can be easily performed, so that large equipment and jigs are not necessary, and the cost can be reduced.

  As described above, according to the first embodiment, there is provided a method for connecting a power feeding unit that feeds power to the winding portion of the stator of the rotating electrical machine from the outside, and is connected to each phase of the winding portion in the axial direction of the stator. A plate-shaped bus bar power supply unit that is pulled out; a terminal block that includes a power supply terminal and is held in the case of the stator; and a plate-shaped terminal that is connected to the power supply terminal of the terminal block and the other is connected to the bus bar power supply unit A fitting portion having a clearance with respect to the circumferential direction is provided in the connecting portion of the terminal with the bus bar feeding portion without any gap with respect to the radial direction of the stator. Since the terminal is fixed to the bus bar power feeding part in a state where the tip side is further protruded in the axial direction from the fitting part with the fitting part fitted between the bus bar power feeding part and the terminal of the terminal block, Variation and installation of itself Even if the positional deviation occurs due to variations in position it can be absorbed in the axial direction and the circumferential direction of the displacement. Therefore, a highly reliable connection structure of the power feeding unit can be obtained.

  Further, the fitting portion is formed by bending a caulking portion provided by extending one side portion of the connecting portion of the terminal from the contact surface with the bus bar feeding portion, and sandwiching the bus bar feeding portion in the fitting portion. Because it is fixed by crimping, it is easy to assemble the terminal, and since it can be crimped more easily than fitting, large-scale equipment and jigs are not required, and costs can be reduced. .

  In addition, a weak part is provided near the abutting surface of the crimping part, and it bends starting from the minimum cross-sectional area of the weak part, so the force required for crimping can be reduced and the equipment and jigs for crimping can be made compact The equipment cost can be reduced.

Embodiment 2. FIG.
In the connection method of the power feeding unit according to the second embodiment, the shape of the connection part between the bus bar power feeding unit 5 and the terminal 8 is the same as that described in FIGS. 1 to 4 of the first embodiment. The second embodiment is characterized in that the joint is further heated and melted to ensure the connection.
FIG. 5 is a diagram illustrating a connection part of the connection method of the power feeding part according to the second embodiment, and is a side view of FIG. 4 viewed in the B direction. The protruding portion of the bus bar power supply portion 5 protruding in the axial direction from the fitting portion 8a of the terminal 8 includes the fitting portion 8a by heating means capable of giving energy over a wide range such as a gas burner or arc welding. By heating and melting the protruding portion and welding at the melting portion 9, it is possible to connect more firmly, and at the same time, it is possible to reduce the electrical resistance, thereby reducing energy loss. Therefore, it leads to the improvement of the characteristic of the motor which applies this connection method of a power feeding part.

  Furthermore, by supplying the brazing material to the melting part at the time of heating and melting, the molten brazing material melts into the gap between the terminal 8 and the bus bar power feeding unit 5, and both can be fixed more firmly. Therefore, the electrical resistance value can be further lowered.

  As described above, according to the connection method of the power feeding part of the second embodiment, the protruding part of the bus bar power feeding part protruding in the axial direction from the fitting part is heated and melted and welded, so that the connection is made stronger by welding. The loss can be reduced by reducing the electrical resistance.

  In addition, since the brazing material is supplied to the vicinity of the melting portion when heat-melting, the molten brazing material melts into the fitting portion, and the fitting portion can be fixed and connected more firmly.

Embodiment 3 FIG.
In the connection method of the power feeding part according to the third embodiment, the shape of the connection part between the bus bar power feeding part 5 and the terminal 8 is the same as that of the first or second embodiment, and the clearance dimension in the circumferential direction of the fitting part 8a. It prescribes.
As described so far, the fitting portion 8a of the terminal 8 is provided with a clearance in the circumferential direction of the stator.
In the connection part between the terminal 8 and the bus bar power supply part 5, misalignment occurs due to the dispersion of the components themselves and the variation of the mounting position. This variation dimension can be predicted from the past results.

Therefore, in the present embodiment, when the assumed variation dimension in the circumferential direction during assembly is C, the circumferential clearance provided in the fitting portion 8a of the terminal 8 is 2C.
That is, as shown in FIG. 6, when the width of the bus bar power feeding part 5 is W, the dimension of the contact surface 8c with the bus bar power feeding part 5 in the circumferential direction of the fitting part 8a is W + 2C. . FIG. 6 shows a case where the clearance 2 </ b> C is equally distributed to both sides in the circumferential direction with respect to the width W of the bus bar power supply unit 5. When the shape of the fitting portion 8a is a rectangular hole, the dimension of the long side of the rectangular hole is W + 2C.
By setting in this way, the bus bar power feeding portion 5 and the terminal 8 are surely brought into contact with the entire contact surface 8c even if the variation in the circumferential direction is taken into account, so that the connection can be made reliably and the connection area can be reduced due to the displacement. Does not shrink.

  As described above, according to the connection method of the power feeding unit of the third embodiment, when the variation dimension in the circumferential direction when assembling the bus bar power feeding unit and the terminal is assumed to be C, the fitting of the terminal Since the circumferential clearance provided in the part is 2C, the connection can be made reliably and the connection area does not decrease due to the positional deviation, so the loss can be reduced.

Embodiment 4 FIG.
The connection method of the power feeding unit according to the fourth embodiment is the same as that described above with respect to the shape of the connection part between the bus bar power feeding unit 5 and the terminal 8, but one end of the bus bar power feeding unit 5 is held by the holding member. To do.
As shown in FIG. 7, a holder 10 having a recess having a gap larger than the plate thickness dimension of the bus bar power supply part 5 is arranged at the end opposite to the connection part of the bus bar power supply part 5 so that the end is accommodated in the recess. To do. A potting agent 11 is filled in a gap between the end of the bus bar power feeding unit 5 and the recess of the holder 10. The side accommodated in the holder 10 of the bus bar power supply unit 5 is not shown in the figure, but is connected to a connection conductor extending in the direction perpendicular to the paper surface of the figure, and this connection conductor is drawn from the winding unit 3. Is electrically connected to the bus bar 4 (see FIG. 1).
As shown in FIG. 2, the three-phase bus bar power feeding portion 5 is displaced in the radial direction, so that the overall shape of the holder 10 is a comb-like shape having three concave portions.

  When the terminal 8 to be connected to the bus bar power supply unit 5 is displaced due to dimensional variations in the radial direction, the bus bar power supply unit 5 is forcibly displaced in the radial direction, but as shown in FIG. Is held by the holder 10 via the soft (low Young's modulus) potting agent 11, the stress can be concentrated on the holding portion, and the entire bus bar power feeding portion 5 can be bent uniformly. Since the generated stress has a welded structure as in the second embodiment, the stress is released, so that the connection can be made without residual stress remaining.

  As described above, according to the connection method of the power feeding unit of the fourth embodiment, the holder having the recesses having an interval larger than the plate thickness dimension of the bus bar power feeding unit at the end opposite to the connection part of the bus bar power feeding unit. Since the end is accommodated in the recess, the potting agent is filled in the gap between the end and the recess, and the bus bar power supply is held by the holder, the circumferential direction, axial direction, diameter between the bus bar power supply and the terminal Misalignment in the direction can be absorbed.

  In the present invention, within the scope of the invention, the embodiments can be freely combined, or the embodiments can be appropriately changed or omitted.

  DESCRIPTION OF SYMBOLS 1 Stator case, 2 Stator core, 3 Winding part, 4 Bus bar, 5 Bus bar feeding part, 6 Terminal block, 7 Connection terminal, 8 Terminal, 8a Fitting part, 8b Crimp part, 8c Contact surface, 8d Fragile part, 9 Melting part, 10 holder, 11 potting agent

A method for connecting a power feeding unit according to the present invention is a method for connecting a power feeding unit that feeds power to a winding portion of a stator of a rotating electrical machine from the outside, and is connected to each phase of the winding portion and drawn out in the axial direction of the stator. A plate-shaped bus bar power supply unit, a terminal block having a power supply terminal and held in the case of the stator, and a plate-shaped terminal connected to the power supply terminal of the terminal block and one connected to the bus bar power supply unit Having a fitting portion having a clearance with respect to the circumferential direction in the connecting portion with the bus bar feeding portion of the terminal without any gap with the bus bar feeding portion with respect to the radial direction of the stator , Formed by bending a caulking part that is provided by extending one side of the terminal connection part from the contact surface with the bus bar power supply part, and fitting the bus bar power supply part to the fitting part and fitting the tip side In a state where it protrudes further in the axial direction than the joint, It is to caulking the terminal sandwich the bus bar feeding portion in the caulking portion.

According to the connection method of the power feeding portion of the present invention, the fitting with the bus bar power feeding portion without any gap in the radial direction of the stator and the clearance in the circumferential direction is fitted in the connection portion with the bus bar power feeding portion of the terminal. The fitting part is formed by bending one side part of the connecting part of the terminal extending from the contact surface with the bus bar power feeding part and bending the crimping part. The bus bar power feeding part is sandwiched between the crimping parts and fixed to the terminal with the tip side protruding further in the axial direction from the fitting part. Even when a displacement occurs due to variations in the components themselves or variations in the mounting position, the displacement in the axial direction and the circumferential direction can be absorbed. Moreover, the assembly can be easily performed by providing the crimping portion. Therefore, a highly reliable connection structure of the power feeding unit can be obtained.

Claims (7)

A method for connecting a power feeding unit that feeds power to a winding portion of a stator of a rotating electrical machine from the outside,
A plate-like bus bar power feeding part connected to each phase of the winding part and drawn out in the axial direction of the stator, a terminal block provided with a power feeding terminal and held in the case of the stator, and one of the terminal blocks A plate-like terminal connected to the power supply terminal and the other connected to the bus bar power supply unit,
The connecting portion of the terminal with the bus bar power feeding portion is provided with a fitting portion that fits without gap with the bus bar power feeding portion with respect to the radial direction of the stator and has a clearance with respect to the circumferential direction. A method of connecting a power feeding part, wherein the terminal is fixed to the bus bar power feeding part in a state in which a part is fitted to the fitting part and the tip side is further protruded in the axial direction from the fitting part. . In the connection method of the electric power feeding part of Claim 1,
The fitting portion is formed by bending a caulking portion provided by extending one side portion of the connection portion of the terminal from a contact surface with the bus bar power feeding portion, and the bus bar is formed on the fitting portion. A method of connecting a power feeding unit, wherein the power feeding unit is sandwiched and fixed by caulking. In the connection method of the electric power feeding part of Claim 2,
A method of connecting a power feeding unit, comprising: providing a fragile portion in a portion of the caulking portion close to the contact surface, and bending the fragile portion at a minimum cross-sectional area. In the connection method of the electric power feeding part of Claim 1 or Claim 2,
A method of connecting a power feeding unit, comprising: heating and melting and welding the protruding portion of the bus bar power feeding unit that protrudes in the axial direction from the fitting portion. In the connection method of the electric power feeding part of Claim 4,
A method of connecting a power feeding unit, characterized in that a brazing material is supplied in the vicinity of the melting part when the heat melting is performed. In the connection method of the electric power feeding part of Claim 1 or Claim 2,
The circumferential clearance provided in the fitting portion of the terminal is set to 2C, where C is a circumferential variation dimension assumed when the bus bar power feeding portion and the terminal are assembled in advance. A method of connecting a power feeding unit as a feature. In the connection method of the electric power feeding part of Claim 1 or Claim 2,
A holder having a recess having an interval larger than the plate thickness of the bus bar power supply portion is disposed at an end of the bus bar power supply portion opposite to the connection portion, and the end portion is accommodated in the recess, and the end portion A method of connecting a power supply unit, wherein a potting agent is filled in a gap between the power supply unit and the recess, and the bus bar power supply unit is held by the holder.

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