JP2021013276A - Wiring structure for rotary electric machine and wiring method for rotary electric machine - Google Patents

Abstract

To arrange a wiring for a rotary electric machine in a manner having an appropriate positional relationship with a rotating member in a limited space in a case.SOLUTION: A wiring structure for a rotary electric machine includes a case (402) having an opening for passing a rotating member extending in the axial direction, a rotary electric machine (40) provided in the case and having one or more first terminals (42), one or more second terminals (522) provided in the case and electrically connected to a power conversion device, and a relay member (70, 70A) fixed around the opening in the case and having one or more conductors (90) that electrically connect one or more first terminals and one or more second terminals.SELECTED DRAWING: Figure 2

Description

The present disclosure relates to a wiring structure for a rotary electric machine and a wiring method for wiring for a rotary electric machine.

A technique for mounting a rotary electric machine in a case having an opening through which an output shaft (an example of a rotating member) is passed is known.

Chinese Patent Publication No. 10847587

However, in the above-mentioned conventional technique, it is difficult to arrange the wiring for the rotary electric machine in a manner having an appropriate positional relationship with the rotating member in the limited space in the case.

Therefore, on one aspect, it is an object of the present invention to arrange wiring for a rotary electric machine in a manner having an appropriate positional relationship with respect to a rotating member in a limited space in a case.

On one side, a case with an opening for an axially extending rotating member to pass through,
A rotary electric machine provided in the case and having one or more first terminals,
One or more second terminals provided in the case and electrically connected to the power converter.
A rotation that includes a relay member that is fixed around the opening in the case and has one or more conductors that electrically connect the one or more first terminals and the one or more second terminals. An electrical wiring structure is provided.

On one side, according to the present invention, it is possible to arrange wiring for a rotating electric machine in a manner having an appropriate positional relationship with respect to a rotating member in a limited space in a case.

It is a figure which shows an example of the whole structure of the motor drive system for electric vehicles. It is explanatory drawing of the inside of the traveling motor unit including the traveling motor. It is a three-sided view of a relay member. It is a perspective view of a relay member. It is a perspective view of the resin part of a relay member. It is a perspective view of the relay bus bar of a relay member. It is a top view which shows typically the relay member suitable for wiring of a low voltage system. It is a schematic flowchart which shows the wiring method of the wiring for a rotary electric machine.

Hereinafter, each embodiment will be described in detail with reference to the accompanying drawings.

In the following, prior to the description of the wiring structure for the rotary electric machine and the wiring method for the wiring for the rotary electric machine according to the present embodiment, first, the motor for the electric vehicle to which the wiring structure for the rotary electric machine according to the present embodiment is preferably applied. The drive system 1 will be described. In the description of FIG. 1 regarding the motor drive system 1 for an electric vehicle, the term "connection" between various elements means "electrical connection" unless otherwise specified.

FIG. 1 is a diagram showing an example of the overall configuration of the motor drive system 1 for an electric vehicle. The motor drive system 1 is a system that drives a vehicle by driving a traveling motor 40 (an example of a rotary electric machine) using the electric power of a high-voltage battery 10. As long as the electric vehicle travels by driving the traveling motor 40 using electric power, the details of its method and configuration are arbitrary. The electric vehicle typically includes a hybrid vehicle whose power source is an engine and a traveling motor 40, and an electric vehicle whose power source is only a traveling motor 40. Hereinafter, the vehicle refers to a vehicle on which the motor drive system 1 is mounted, unless otherwise specified.

As shown in FIG. 1, the motor drive system 1 includes a high-pressure battery 10, a smoothing capacitor C, an inverter 30, a traveling motor 40, a thermistor 41, and an inverter control device 50.

The high-voltage battery 10 is an arbitrary power storage device that stores electric power and outputs a DC voltage, and may include a capacitive element such as a nickel-hydrogen battery, a lithium-ion battery, or an electric double-layer capacitor. The high voltage battery 10 is typically a battery having a rated voltage of more than 100V and a rated voltage of, for example, 288V.

The inverter 30 includes U-phase, V-phase, and W-phase arms arranged in parallel with each other between the positive electrode line and the negative electrode line. The U-phase arm includes a series connection of switching elements (IGBT: Insulated Gate Bipolar Transistor) Q1 and Q2 in this example, and a V-phase arm includes a series connection of switching elements (IGBT) Q3 and Q4 in this example. Includes a series connection of switching elements (IGBTs in this example) Q5 and Q6. Further, diodes D11 to D16 are arranged between the collector and the emitter of each of the switching elements Q1 to Q6 so that a current flows from the emitter side to the collector side, respectively. Note that the switching elements Q1 to Q6 may be switching elements other than the IGBT, such as a MOSFET (methal index semiconductor field-effect transistor).

The traveling motor 40 is a three-phase AC motor, and one ends of three U, V, and W phases coils are commonly connected at a midpoint. The other end of the U-phase coil is connected to the midpoint M1 of the switching elements Q1 and Q2, the other end of the V-phase coil is connected to the midpoint M2 of the switching elements Q3 and Q4, and the other end of the W-phase coil is. It is connected to the midpoint M3 of the switching elements Q5 and Q6. A smoothing capacitor C is connected between the collector of the switching element Q1 and the negative electrode line.

The thermistor 41 generates an electric signal according to the temperature of the traveling motor 40. The thermistor 41 is connected to the inverter control device 50 by wiring 411.

Various sensors such as a thermistor 41 and a current sensor (not shown) for detecting the current flowing through the traveling motor 40 are connected to the inverter control device 50. The inverter control device 50 controls the inverter 30 based on sensor information from various sensors. The inverter control device 50 includes, for example, a CPU, a ROM, a main memory (all not shown), and the various functions of the inverter control device 50 are such that a control program recorded in the ROM or the like is read into the main memory by the CPU. It is realized by being executed. The control method of the inverter 30 is arbitrary, but basically, the two switching elements Q1 and Q2 related to the U phase are turned on / off in opposite phases, and the two switching elements Q3 and Q4 related to the V phase are turned on and off. The two switching elements Q5 and Q6 related to the W phase turn on / off in opposite phases to each other.

In the example shown in FIG. 1, the motor drive system 1 includes a single traveling motor 40, but may include an additional motor (including a generator). In this case, the additional motors (s) may be connected to the high voltage battery 10 together with the corresponding inverters in parallel with the traveling motor 40 and the inverter 30. Further, in the example shown in FIG. 1, the motor drive system 1 does not include a DC / DC converter, but a DC / DC converter may be provided between the high-voltage battery 10 and the inverter 30.

As shown in FIG. 1, a cutoff switch SW1 for cutting off the power supply from the high-voltage battery 10 is provided between the high-voltage battery 10 and the smoothing capacitor C. The cutoff switch SW1 may be composed of a semiconductor switch, a relay, or the like. The shutoff switch SW1 is normally on, and is turned off when, for example, a vehicle collision is detected. The on / off switching of the cutoff switch SW1 may be realized by the inverter control device 50, or may be realized by another control device.

Next, the wiring structure for the rotary electric machine and the wiring method for the rotary electric machine according to the present embodiment will be described with reference to FIGS. 2 and 2. In addition, in FIG. 2 and later, for the sake of legibility, there are cases where a reference reference numeral is only partially attached to a plurality of parts having the same attribute.

In the following, as an example, a case where the traveling motor 40 is arranged on the rear side of the vehicle will be mainly described. On the rear side of the vehicle, it is desirable that the height of the entire assembly 400 including the traveling motor 40 is designed to be as low as possible in relation to the rear seats and the trunk room. The wiring structure for a rotary electric machine according to the present embodiment can be suitably used to efficiently reduce the height of the entire assembly 400 including the traveling motor 40, as described below.

FIG. 2 is an explanatory view of the inside of the assembly 400 (hereinafter, referred to as “travel motor unit 400”) including the travel motor 40. In FIG. 2, the case 402 of the traveling motor unit 400 is shown in a cross-sectional view, and the power module unit 504 (an example of a power conversion device) is shown by a broken line only in outline of the outer shape. In FIG. 2, three directions orthogonal to each other, the X direction, the Y direction, and the Z direction, are defined. In the following, the Z direction is the vertical direction, the Z1 side (positive side) is the upper side, and the Z2 side (negative side) is the lower side. In this case, the X direction corresponds to the vehicle lateral direction, and the Y direction corresponds to the vehicle front-rear direction.

The traveling motor unit 400 includes an inverter 30, a traveling motor 40, an inverter control device 50, and the like included in the motor drive system 1 described above.

The traveling motor unit 400 includes a case 402 fixed to a vehicle body (not shown), and the case 402 supports an inverter 30, a traveling motor 40, an inverter control device 50, and the like. Specifically, the traveling motor 40 is housed in the case 402, and the inverter 30 and the inverter control device 50 are provided on the upper part of the case 402 as the power module unit 504. The power module unit 504 may include a cooling structure (not shown) of the inverter 30 and the like.

The case 402 may have a cross-sectional shape as shown in FIG. 2, extending in the X direction, and both ends in the X direction may be closed. The case 402 may be formed of a plurality of members. The case 402 has an opening 4021 through which a drive shaft (not shown) (an example of a rotating member) passes. The drive shaft extends in the X direction and is connected to the rear wheels of the vehicle. The opening 4021 has a circular opening shape when viewed in the X direction, and the circular opening shape is concentric with the rotation center O of the drive shaft and has an inner diameter corresponding to the outer diameter of the drive shaft.

The case 402 has a side wall portion 4020 on which the opening 4021 is formed when viewed in the X direction, and a wall portion 4022 in a manner surrounding the traveling motor 40, and is inside the wall portion 4022 when viewed in the X direction. Substantially forms the internal space of the case 402. In the following, the inside of the case 402 refers to a space surrounded by the side wall portion 4020 and the wall portion 4022 (inside the wall portion 4022). As shown in FIG. 2, the case 402 has a recess 4023 recessed downward above the opening 4021, and the power module unit 504 is mounted in the recess 4023. Therefore, the upper portion of the traveling motor unit 400 is formed by a part of the case 402 and the power module unit 504. The bottom of the recess 4023 forms a part of the wall 4022.

In this embodiment, the depth of the recess 4023 (dimension in the Z direction) is substantially the same as the height of the power module unit 504 (dimension in the Z direction). Therefore, the height direction dimension of the traveling motor unit 400 also depends on the position of the upper surface of the power module unit 504. In other words, the depth of the recess 4023 is determined so that the top surface of the power module unit 504 is not significantly above the top surface of the case 402. However, in the modified example, the depth of the recess 4023 (dimension in the Z direction) may be slightly smaller than the depth of the power module unit 504 (dimension in the Z direction), or may be slightly larger.

The traveling motor 40 is fixed to the case 402. The traveling motor 40 is arranged on the Y1 side in the Y direction with respect to the opening 4021. Further, the traveling motor 40 is arranged in a range that overlaps (overlaps) the opening 4021 in the vertical direction. In the example shown in FIG. 2, as an example, the center of the opening 4021 is located below the center of the traveling motor 40, and the lower end of the opening 4021 is above the lower end of the stator 40A of the traveling motor 40. Located in.

As shown in FIG. 2, the traveling motor 40 has three terminals 42 (an example of the first terminal) at the end of the coil for the power line L1 (see FIG. 1) (hereinafter, for the sake of distinction, "motor terminals". 42 ”). The coil for the power line L1 may be formed of, for example, a flat wire. The three motor terminals 42 may be formed of, for example, a sheet metal member electrically connected to the end of the coil for the power line L1. The three motor terminals 42 extend in the YZ plane and may be fixed to the three relay bus bars 90 described later with three bolts 60.

The three motor terminals 42 are provided around the opening 4021 and in the vicinity of the opening 4021 when viewed in the X direction. In the example shown in FIG. 2, the three motor terminals 42 are arranged on the drive shaft side (Y2 side) of the traveling motor 40. Further, the three motor terminals 42 are arranged on the Y1 side in the Y direction with respect to the reference line Lz in the Z direction passing through the center of the opening 4021. In the example shown in FIG. 2, the uppermost motor terminal 42 of the three motor terminals 42 slightly overlaps the opening 4021 in the Y direction, but is arranged on the Y1 side in the Y direction with respect to the opening 4021. You may.

Further, of the three motor terminals 42, the motor terminal 42 in the middle in the vertical direction is arranged within a range overlapping the opening 4021 in the vertical direction. On the other hand, of the three motor terminals 42, the uppermost motor terminal 42 is arranged above the opening 4021 in the vertical direction, and the lowermost motor terminal 42 is arranged above the opening 4021 in the vertical direction. Is also placed on the lower side. However, in the modified example, the positions of the three motor terminals 42 in the vertical direction with respect to the opening 4021 may be changed as appropriate.

As described above, the power module unit 504 is provided in the recess 4023 of the case 402. The power module unit 504 is arranged on the Y2 side in the Y direction with respect to the traveling motor 40. Further, the power module unit 504 preferably extends within a range that does not overlap with the traveling motor 40 in the Y direction, as shown in FIG. In this case, the mounting position of the power module unit 504 with respect to the traveling motor 40 can be made relatively low. Specifically, the lowermost portion of the power module unit 504 (that is, the upper surface of the bottom portion of the recess 4023) is located below the upper end of the stator 40A of the traveling motor 40. As a result, the power module unit 504 can extend within a range where it overlaps with the traveling motor 40 in the vertical direction, so that the physique (height) of the traveling motor unit 400 in the vertical direction can be efficiently reduced. In the modified example, the traveling motor 40 and the power module unit 504 are positioned so that the end of the power module unit 504 on the Y1 side in the Y direction and the end of the traveling motor 40 on the Y2 side of the Y direction overlap in the Y direction. It may be arranged in relation to each other.

As shown in FIG. 2, the power module unit 504 has three bus bars 52 (hereinafter, referred to as “inverter bus bars 52” for distinction). The three inverter bus bars 52 form a part of a power line L1 (see FIG. 1) that electrically connects the inverter 30 and the traveling motor 40. The three inverter bus bars 52 may be formed of, for example, a sheet metal member. The three inverter buses 52 may be in a form integrated with resin (that is, a form in which the sheet metal member is molded with resin). The three inverter bus bars 52 may be integrated with the power module unit 504 or may be separate modules. In either case, one end 521 of each of the three inverter bus bars 52 is a power module unit. It is electrically connected to the inverter 30 in 504.

The other end 522 (an example of the second terminal) (hereinafter, referred to as "inverter terminal 522") of each of the three inverter buses 52 is arranged below the power module unit 504. The inverter terminals 522 of each of the three inverter buses 52 extend downward into the case 402 through an opening (not shown) formed at the bottom of the recess 4023. Each inverter terminal 522 of the three inverter bus bars 52 may be fixed to the three relay bus bars 90 described later with three bolts 62.

Like the three motor terminals 42 described above, the three inverter terminals 522 are provided around the opening 4021 and in the vicinity of the opening 4021 when viewed in the X direction. In the example shown in FIG. 2, the three inverter terminals 522 are arranged on the Y2 side in the Y direction with respect to the reference line Lz in the Z direction passing through the center of the opening 4021. More specifically, the three inverter terminals 522 are arranged on the Y2 side in the Y direction with respect to the opening 4021. However, in the modified example, at least one of the three inverter terminals 522 may be arranged at a position overlapping the opening 4021 in the Y direction and above the opening 4021.

Further, the inverter terminals 522 of the three inverter buses 52 are arranged above the reference line Ly in the Y direction passing through the center of the opening 4021 in the vertical direction. However, in the modified example, the positions of the three motor terminals 42 in the vertical direction with respect to the opening 4021 may be changed as appropriate. The inverter terminals 522 of each of the three inverter buses 52 extend in the YZ plane, and the surface on one side in the X direction (the back side of the paper surface in FIG. 2) is on the side wall portion 4020 (for example, the side wall portion 4020) of the case 402. It may be supported by a support surface in the YZ plane that is convex in the X direction).

In this embodiment, the motor terminal 42 and the inverter bus bar 52 are electrically connected via the relay member 70.

The relay member 70 is fixed around the opening 4021 when viewed in the X direction. That is, the relay member 70 is fixed around the drive shaft when viewed in the X direction.

As shown in FIG. 2, the relay member 70 has a cylindrical shape having an inner peripheral surface centered on the circular center of the opening 4021 (concentric with the rotation center O of the drive shaft) when viewed in the X direction. .. A drive shaft is passed through the inside of the relay member 70 in the radial direction. The relay member 70 may be fastened to the case 402 with bolts 64 (see FIG. 2).

Here, the relay member 70 will be further described with reference to FIGS. 3 to 6.

FIG. 3 is a three-view view of the relay member 70, and FIG. 4 is a perspective view of the relay member 70. FIG. 5 is a perspective view of the resin portion 80 of the relay member 70. FIG. 6 is a perspective view of the relay bus bar 90 (an example of the conductor portion) of the relay member 70.

The relay member 70 includes a resin portion 80 and three relay bus bars 90. The relay member 70 may be formed by integrating the relay bus bar 90 with a resin. That is, the relay member 70 may be formed by insert molding.

The resin portion 80 seals the three relay bus bars 90 except for the end portion (terminal portion) of the relay bus bar 90. As shown in FIG. 5, the resin portion 80 has three leg portions 82, each leg portion 82 has a lower end portion 821 in the form of a flange, and the lower end portion 821 has an insertion hole 8211 for a bolt 64. Is formed. In the resin portion 80, each lower end portion 821 is fastened to the case 402 by each corresponding bolt 64 (see FIG. 2).

Further, as shown in FIG. 5, the resin portion 80 has a flat surface portion 84 (a flat surface portion in the XY plane) as a terminal block, and the motor-side terminals of the three relay bus bars 90 are on the flat surface portion 84. 921 is exposed. The flat surface portion 84 may have a partition wall 85 for ensuring insulation between the three relay bus bars 90.

The three relay bus bars 90 form a part of a power line L1 (see FIG. 1) that electrically connects the inverter 30 and the traveling motor 40. The three relay bus bars 90 may be formed of, for example, sheet metal. The three relay bus bars 90 are held by the resin portion 80 in a state where the necessary insulation distances from each other are secured.

As shown in FIG. 6, the three relay bus bars 90 have an arc portion 91 (an example of a first portion), a motor side portion 92 (an example of a second portion), and an inverter side portion 93 (an example of the third portion), respectively. An example) and is included. Hereinafter, unless otherwise specified, any one of the three relay bus bars 90 will be described.

The arc portion 91 extends along an arc centered on the rotation center O (see FIGS. 2 and 3) of the drive shaft. That is, the arc portion 91 is concentric with the cross-sectional shape of the drive shaft and the opening shape of the opening 4021 when viewed in the X direction. The inner diameter of the arc portion 91 is determined so as to secure an appropriate clearance with respect to the drive shaft. As a result, it is possible to minimize the wiring space for the power line L1 around the drive shaft.

The arc portion 91 preferably extends in a direction in which the thickness direction of the sheet metal coincides with the radial direction, as shown in FIG. As a result, the radial direction of the wiring space for the power line L1 around the drive shaft can be effectively reduced as compared with the case where the thickness direction of the sheet metal related to the arc portion extends in the direction corresponding to the X direction.

The motor-side portion 92 has a motor-side terminal 921 that overlaps with one of the three motor terminals 42 (see FIG. 2) in the vertical direction. The motor-side portion 92 extends from one end of the arc portion 91 (the end on the Y1 side in the Y direction) and forms the motor-side terminal 921 at the end portion. The insertion hole 9211 for the bolt 60 is formed in the motor side terminal 921. As shown in FIG. 6, the motor side portion 92 may include a bent portion at a right angle from the X direction to the YZ plane.

The motor side terminal 921 extends in the YZ plane, and the corresponding motor terminal 42 overlaps the upper side to be electrically connected. The motor side terminal 921 and one corresponding motor terminal 42 may be fastened with bolts 60 (see FIG. 2).

The inverter side portion 93 has an inverter side terminal 931 that vertically overlaps with one of the three inverter bus bars 52 (see FIG. 2) corresponding to the inverter bus bar 52. The inverter side portion 93 extends from the other end of the arc portion 91 (the end portion on the Y2 side in the Y direction), and forms the inverter side terminal 931 at the end portion. The insertion hole 9311 for the bolt 62 is formed in the inverter side terminal 931. As shown in FIG. 6, the inverter side portion 93 may include a bent portion perpendicular to the YZ plane from the X direction.

The inverter side terminal 931 extends in the YZ plane and overlaps the upper side of the corresponding inverter terminal 522. The inverter side terminal 931 and one corresponding inverter terminal 522 (inverter bus bar 52) may be fastened with bolts 62 (see FIG. 2).

By the way, in the configuration in which the traveling motor 40 is provided in the case 402 and the drive shaft passes through the case 402 as in the present embodiment, the power line L1 or the like has an appropriate positional relationship with the drive shaft. It is difficult to route the wiring. Since it is highly necessary to secure an appropriate clearance with respect to the drive shaft around the opening 4021 for the drive shaft, the substantial wiring space for the power line L1 and the like tends to be small.

In particular, when the recess 4023 is formed on the upper side of the case 402 as in this embodiment, there is a strong tendency for the allocation space for the power line L1 to become smaller on the upper side of the opening 4021 due to the recess 4023. Become. This is because the wall portion 4022 of the case 402 is located on the lower side due to the recess 4023.

In this regard, according to the present embodiment, as described above, the portion of the power line L1 between the three motor terminals 42 and the three inverter terminals 522 is formed by the relay bus bar 90 in the relay member 70. Will be done. Since the relay bus bar 90 is firmly fixed by the resin portion 80, the position accuracy can be easily obtained. That is, by fixing the relay member 70 to the case 402, the relay bus bar 90 of the relay member 70 is substantially fixed to the case 402. Therefore, in the present embodiment, as compared with the case where the relay bus bar 90 is realized by a cable or the like, the possibility that the relay bus bar 90 is displaced with respect to the case 402 due to vibration or the like is substantially eliminated, and the relay bus bar 90 and the drive are eliminated. The distance between the shaft and the shaft can be minimized. As a result, according to the present embodiment, even when the wiring space around the opening 4021 is relatively small, the power line L1 can be arranged in such a manner that an appropriate distance from the drive shaft can be secured. Become. Further, according to this embodiment, it is possible to eliminate inconveniences (addition of parts such as clamps for suppressing vibration, interference caused by vibration, etc.) that may occur when the relay bus bar 90 is realized by a cable or the like. ..

In this way, according to the present embodiment, the drive shaft is provided by providing the relay member 70 while reducing the height of the traveling motor unit 400 by providing the recess 4023 for the power module unit 504 on the upper side of the case 402. The power line L1 can be arranged around the opening 4021 in the case 402 so that the distance between the two and the case can be appropriately secured.

In this embodiment, all three relay bus bars 90 connecting between the three motor terminals 42 and the three inverter terminals 522 have an arc portion 91, but only a part has an arc portion. You may. Further, in the three relay bus bars 90, the form of the arc portion 91 may be changed from the form shown in FIG. 6 according to the positional relationship between the three motor terminals 42 and the three inverter terminals 522.

For example, as one inverter terminal 522 moves toward the Y1 side in the Y direction from the position shown in FIG. 2 (for example, when one inverter terminal 522 is located directly above the opening 4021), the one inverter terminal The arc length (angle around the rotation center O of the drive shaft) of the arc portion 91 of the relay bus bar 90 electrically connected to 522 becomes smaller.

In this respect, in this embodiment, each arc portion 91 of the three relay bus bars 90 preferably extends within a range of 90 degrees or more and 180 degrees or less along the arc around the rotation center O of the drive shaft. In this case, even when a relatively deep recess such as the recess 4023 is formed above the opening 4021, it becomes easy to route the power line L1 around the opening 4021.

However, in the modified example, at least one arc portion 91 of the three relay bus bars 90 may extend within a range of 30 degrees or more and 90 degrees or less along the arc around the rotation center O of the drive shaft. .. In this case, the inverter bus bar 52 is arranged above the opening 4021 (arranged in the recess 4023 of the case 402), and the remaining portion of the power module unit 504 is located on the Y2 side in the Y direction from the position shown in FIG. It may be arranged. Even in such a modification, the power line L1 can be arranged around the opening 4021 while minimizing the vertical distance between the power module unit 504 arranged in the upper part of the case 402 and the opening 4021. It will be possible.

Although the above-described embodiment relates to the wiring of the power line L1 around the opening 4021, it can also be applied to the wiring of other wiring between the traveling motor 40 and the inverter control device 50. For example, as another wiring between the traveling motor 40 and the inverter control device 50, there is wiring 411 of the thermistor 41 (an example of a wiring portion through which an electric signal lower than the power line L1 flows) (see FIG. 1). Other wiring (low-voltage wiring) such as wiring 411 may be clamped to the outer peripheral side of the relay member 70, or may be partially sealed in the resin portion 80 of the relay member 70.

FIG. 7 is a top view schematically showing a relay member 70A suitable for arranging low-voltage wiring (for example, wiring 411).

The relay member 70A is different from the above-mentioned relay member 70 in that a part of the wiring 411 (see FIG. 1) 411A is built in (sealed with the resin portion 80). Further, the relay member 70A includes a connector C1 to which one end of a part 411A of the wiring 411 is electrically connected, and a connector C2 to which the other end of a part 411A of the wiring 411 is electrically connected. The connector C1 and / or the connector C2 may be integrally formed with the relay member 70A, or may be integrated by adhesion or the like. In this case, the other part (not shown) of the wiring 411 drawn from the traveling motor 40 is electrically connected to the connector C1, and the other one of the wiring 411 drawn out from the inverter control device 50 is connected to the connector C2. By electrically connecting the parts (not shown), the wiring 411 can be realized in cooperation with a part 411A of the wiring 411. In this case as well, the wiring 411 makes it easy to arrange the power line L1 around the opening 4021 as in the case of the power line L1, so that the number of parts can be reduced as compared with the case of clamping to the case 402. be able to. The connectors C1 and C2 may have a plurality of terminals, and low-voltage wiring other than the wiring 411 may be electrically connected.

Next, a method of arranging the wiring for the rotary electric machine will be described.

FIG. 8 is a schematic flowchart showing a method of arranging wiring for a rotary electric machine. Part or all of the following steps may be realized manually or automatically by a robot or the like.

In step S800, the traveling motor 40, the relay member 70, the case 402, and the power module unit 504 are prepared.

In step S802, the power module unit 504 is assembled to the case 402.

In step S804, the relay member 70 is assembled to the case 402. In this embodiment, the relay member 70 is fastened to the case 402 at three points by bolts 64.

In step S806, each inverter side terminal 931 of the three relay bus bars 90 of the relay member 70 and the three inverter terminals 522 of the power module unit 504 are fastened by the bolt 62.

In step S808, the traveling motor 40 is assembled to the case 402.

In step S810, each motor side terminal 921 of the three relay bus bars 90 of the relay member 70 and the motor terminal 42 of the traveling motor 40 are fastened by bolts 60.

According to such a wiring method for rotating electric machines, the relay member 70 is assembled to the case 402 before the traveling motor 40 is assembled to the case 402, so that the relay member 70 can be assembled to the case 402 with high accuracy. it can. As a result, the positioning accuracy of the relay bus bar 90 with respect to the case 402 can be improved. As a result, the positional accuracy of the portion of the power line L1 formed by the relay bus bar 90 can be improved, and a constant distance in the radial direction with respect to the drive shaft can be maintained in the limited wiring space around the opening 4021. The power line L1 can be efficiently routed depending on the embodiment.

Further, according to the wiring method for the rotary electric machine, the relay member 70 is assembled to the case 402 before the traveling motor 40 is assembled to the case 402. Therefore, the motor terminal 42 is based on the flat surface portion 84 of the relay member 70. And the motor side terminal 921 of the relay bus bar 90 can be fastened with good workability.

Although each embodiment has been described in detail above, the present invention is not limited to a specific embodiment, and various modifications and changes can be made within the scope of the claims. It is also possible to combine all or a plurality of the components of the above-described embodiment.

For example, in the above-described embodiment, the opening 4021 is an opening for passing a drive shaft, but is provided with an opening for passing a rotating member (a member for transmitting a driving force to the wheels) other than the drive shaft. It is also applicable in.

Further, in the above-described embodiment, the relay member 70 (also the relay member 70A) has a closed annular shape (cylindrical shape) when viewed in the X direction, but the relay member 70 may have a non-closed annular shape. Good.

Further, in the above-described embodiment, two of the three relay bus bars 90 pass above the opening 4021 and pass below the remaining one opening 4021, from the Y1 side in the Y direction to Y2. It extends to the side, but is not limited to this. For example, only one of the three relay bus bars 90 passes above the opening 4021 and below the remaining two openings 4021 and extends from the Y1 side to the Y2 side in the Y direction. You may. Alternatively, all three relay bus bars 90 may extend from the Y1 side to the Y2 side in the Y direction in a manner in which all of the three relay bus bars 90 pass above or below the opening 4021. In this case, the relay member 70 (the same applies to the relay member 70A) may have a substantially half annular shape when viewed in the X direction.
Further, in the above-described embodiment, the opening 4021 has a circular opening shape when viewed in the X direction, but the opening shape when viewed in the X direction is arbitrary. For example, the opening 4021 may have a polygonal opening shape when viewed in the X direction. In this case, the arc portion 91 of the relay bus bar 90 may be realized by a polygonal portion along the polygonal shape of the opening 4021 when viewed in the X direction.

<Additional notes>
The following will be further disclosed with respect to the above examples. Of the effects described below, the effect relating to each additional form with respect to one form is an additional effect resulting from each of the additional forms.

(1) One form includes a case (402) having an opening (4021) for passing a rotating member extending in the axial direction.
A rotary electric machine (40) provided in the case and having one or more first terminals (42), and
One or more second terminals (522) provided in the case and electrically connected to the power converter (504).
A relay member (70) having one or more conductors (90) fixed around the opening in the case and electrically connecting the one or more first terminals and the one or more second terminals. , 70A), and a wiring structure for a rotary electric machine.

According to this embodiment, one or more first terminals and one or more second terminals are electrically connected via a relay member fixed around the opening. By fixing the relay member around the opening, the positional accuracy of one or more conductors can be improved. As a result, in the limited space in the case around the opening, it is possible to arrange the wiring for the rotating electric machine in a manner having an appropriate positional relationship with the rotating member.

(2) Further, in the present embodiment, preferably, the rotary electric machine and the power conversion device overlap each other when viewed in the horizontal direction in the horizontal plane in the mounted state and orthogonal to the axial direction.
In this case, the height dimension (including the case) in the state where the power conversion device is arranged is compared with the case where the rotating electric machine and the power conversion device do not overlap when viewed in the horizontal direction (when offset in the vertical direction). Assembly dimensions) can be reduced. In addition, when a certain part overlaps with another one part, a mode in which a part or all of the one part overlaps with the other one part, or one of the other one parts. It is a concept including a mode in which a part or the whole overlaps with the one part.
(3) Further, in the present embodiment, preferably, the power conversion device and the opening overlap each other when viewed in the vertical direction of the mounted state.
In this case, the power conversion device can be arranged by utilizing the space above or below the opening. As a result, the lateral dimensions (assembly including the case) with the power converter placed are compared to the case where the power converter and the opening do not overlap when viewed vertically (offset in the horizontal direction). Dimension) can be reduced.
(4) Further, in the present embodiment, preferably, the rotary electric machine and the opening overlap with each other when viewed in the lateral direction in the horizontal plane in the mounted state and orthogonal to the axial direction.
In this case, the height dimension (assembly including the case) in the state where the power conversion device is arranged is compared with the case where the rotating electric machine and the opening do not overlap when viewed in the horizontal direction (when offset in the vertical direction). Dimensions) can be easily reduced.
(5) Further, in the present embodiment, preferably, the power conversion device is attached to the outside of the case.

In this case, the relay member fixed around the opening can be used to route the wiring between the power conversion device attached to the outside of the case and the rotary electric machine.

(6) Further, in the present embodiment, preferably, the case has a recess (4023) that is recessed downward in the vertical direction (Z) of the rotary electric machine in the mounted state, and the electric power is formed in the recess. A conversion device is provided.

In this case, the height dimension (the dimension of the assembly including the case) in the state where the power conversion device is arranged can be reduced. Further, by providing the recess, the wiring space around the opening tends to be relatively small above the opening, but by using the relay member, it is appropriate for the rotating member. It is possible to arrange the wiring for the rotary electric machine in a manner having a good positional relationship.

(7) Further, in the present embodiment, preferably, the one or more second terminals are the one or more second terminals with respect to a reference line (Lz) passing through the center of the opening when viewed in the axial direction. It is located on the opposite side of terminal 1.

In this case, one or more first terminals and one or more second terminals on both sides can be electrically connected via the relay member across the reference line. This eliminates the need for cable routing that straddles the reference line, and can efficiently reduce inconveniences (cable vibration, etc.) when such cables are routed.

(8) Further, in the present embodiment, preferably, the reference line extends parallel to the vertical direction of the rotating electric machine in the mounted state when viewed in the axial direction.

In this case, one or more first terminals and one or more second terminals can be electrically connected via a relay member without arranging the first terminal or the like in the wiring space above the opening. .. As a result, the height dimension of the assembly including the case can be reduced.

(9) Further, in the present embodiment, preferably, the one or more first terminals are arranged between the opening and the rotary electric machine when viewed in the axial direction.
The one or more second terminals are arranged on the side opposite to the rotary electric machine with respect to the opening when viewed in the axial direction.

In this case, the wiring related to one or more first terminals can be shortened, the wiring related to one or more second terminals can be shortened, and efficient wiring can be realized via the relay member.

(10) Further, in the present embodiment, preferably, the relay member has a cylindrical shape extending in the axial direction, and a resin portion (80) covering at least a part of the one or more conductor portions. Has.

In this case, vibration and the like of one or more conductor portions can be effectively prevented, and the required insulation distance between the conductor portion and the other conductor can be efficiently secured. Further, since it has a cylindrical shape, the conductor portion around the opening can be covered with the resin portion in a relatively wide range.

(11) Further, in the present embodiment, preferably, the resin portion of the relay member is fastened to the case.

In this case, one or more conductor portions can be accurately positioned with respect to the case via the resin portion of the relay member. As a result, even when the wiring space for one or more conductor portions is relatively small and the wiring space around the opening is relatively small, it is possible to route the wiring related to the one or more conductor portions.

(12) Further, in the present embodiment, preferably, the one or more conductor portions extend along an arc or a polygon centered on the rotation center (O) of the rotating member when viewed in the axial direction. Exists.

In this case, in the limited wiring space around the opening, wiring related to one or more conductor portions can be efficiently routed while maintaining a constant distance in the radial direction with respect to the rotating member.

(13) Further, in the present embodiment, preferably, the one or more conductor portions extend from the first portion (91) extending along the arc or the polygon, and from one end of the first portion. A second portion (92) that exists and is connected to the one or more first terminals, and a third portion (93) that extends from the other end of the first portion and is connected to the one or more second terminals. ) And
The first portion of the one or more conductor portions extends within a range of 30 degrees or more and 180 degrees or less about the rotation center of the rotating member when viewed in the axial direction.

In this case, it is possible to efficiently increase the range of the wiring portion carried by the relay member in the wiring to be distributed. As a result, inconveniences related to vibration of the wiring to be distributed and deterioration of positioning accuracy can be efficiently reduced.

(14) In the present embodiment, preferably, the one or more conductor portions form the power line (L1) of the rotary electric machine.
The relay member (70A) is a wiring portion drawn out from the rotary electric machine, and clamps or incorporates a wiring portion (411) through which an electric signal lower than the power line flows.

In this case, the relay member can be used to efficiently route the low-voltage wiring portion together with the power line of the rotary electric machine.

(15) Another form is a case (402) having an opening for passing a rotating member extending in the axial direction, and a rotating electric machine (40) having one or more first terminals (42). It has one or more second terminals (522) and one or more conductor portions (90) for electrically connecting the one or more first terminals and the one or more second terminals. Prepare the relay members (70, 70A) and
Assemble the relay member to the case,
This is a method of arranging wiring for a rotary electric machine, in which the one or more first terminals are electrically connected to the one or more conductor portions of the relay member assembled to the case.

In this case, since the relay member is assembled to the case before the rotary electric machine is assembled to the case, the relay member can be assembled to the case with high accuracy. As a result, the positioning accuracy of the relay member with respect to the case can be improved. As a result, the positional accuracy of one or more conductor portions of the relay member can be improved, and one can be maintained at a constant distance in the radial direction with respect to the rotating member in the limited wiring space around the opening. Wiring related to the above conductors can be efficiently routed.

(16) In the present embodiment, preferably, the one or more second terminals are the one or more first terminals with respect to a reference line (Lz) passing through the center of the opening when viewed in the axial direction. Located on the opposite side of
The reference line extends parallel to the vertical direction of the rotating electric machine in the mounted state.

In this case, one or more first terminals and one or more second terminals on both sides can be electrically connected via a relay member across a reference line parallel to the vertical direction. This eliminates the need for arranging cables that straddle reference lines parallel in the vertical direction, and can efficiently reduce inconveniences (cable vibration, etc.) when arranging such cables. Further, one or more first terminals and one or more second terminals can be electrically connected via a relay member without arranging the first terminal or the like in the space above the opening. As a result, the dimensions in the height direction can be reduced.

1 Motor drive system 10 High-pressure battery 30 Inverter 40 Traveling motor 40A Stator 41 Thermista 42 Motor terminal 50 Inverter control device 52 Inverter bus bar 60 Volt 62 Bolt 64 Bolt 70, 70A Relay member 80 Resin part 90 Relay bus bar 91 Arc part 92 Motor side Part 93 Inverter side part 400 Traveling motor unit 402 Case 411 Wiring 504 Power module unit 522 Inverter terminal 921 Motor side terminal 931 Inverter side terminal 4021 Opening 4022 Wall 4023 Recessed 9211 Insertion hole 9311 Insertion hole 9311

Claims (16)

A case with an opening for passing a rotating member extending in the axial direction,
A rotary electric machine provided in the case and having one or more first terminals,
One or more second terminals provided in the case and electrically connected to the power converter.
A rotation that includes a relay member that is fixed around the opening in the case and has one or more conductors that electrically connect the one or more first terminals and the one or more second terminals. Wiring structure for electrical equipment. The wiring structure for a rotary electric machine according to claim 1, wherein the rotary electric machine and the power conversion device overlap each other when viewed in the horizontal direction in the horizontal plane in the mounted state and orthogonal to the axial direction. The wiring structure for a rotary electric machine according to claim 1 or 2, wherein the power conversion device and the opening overlap each other when viewed in the vertical direction of the mounted state. The one according to any one of claims 1 to 3, wherein the rotary electric machine and the opening overlap each other when viewed in the horizontal direction in the horizontal plane in the mounted state and orthogonal to the axial direction. Wiring structure for rotary electric machines. The wiring structure for a rotary electric machine according to any one of claims 1 to 4, wherein the power conversion device is attached to the outside of the case. The wiring structure for a rotary electric machine according to claim 5, wherein the case has a recess that is recessed downward in the vertical direction in the mounted state, and the power conversion device is provided in the recess. Claims 1 to 6, wherein the one or more second terminals are located on the side opposite to the one or more first terminals with respect to a reference line passing through the center of the opening when viewed in the axial direction. Wiring structure for rotary electric machine of any one of them. The wiring structure for a rotary electric machine according to claim 7, wherein the reference line extends parallel to the vertical direction of the rotary electric machine in the mounted state when viewed in the axial direction. The one or more first terminals are arranged between the opening and the rotary electric machine when viewed in the axial direction.
The one or more second terminals for the rotary electric machine according to any one of claims 1 to 5, which are arranged on the side opposite to the rotary electric machine with respect to the opening when viewed in the axial direction. Wiring structure. The relay member has a cylindrical shape extending in the axial direction, and has a resin portion covering at least a part of the one or more conductor portions, according to any one of claims 1 to 9. Wiring structure for rotary electric machines. The wiring structure for a rotary electric machine according to claim 10, wherein the relay member has a resin portion fastened to the case. The invention of any one of claims 1 to 11, wherein the one or more conductor portions extend along an arc or a polygon centered on the center of rotation of the rotating member when viewed in the axial direction. Wiring structure for rotary electric machines. The one or more conductor portions are a first portion extending along the arc or the polygon, and a second portion extending from one end of the first portion and connected to the one or more first terminals. Includes a portion and a third portion that extends from the other end of the first portion and is connected to the one or more second terminals.
12. The first portion of the one or more conductor portions extends within a range of 30 degrees or more and 180 degrees or less about the center of rotation of the rotating member when viewed in the axial direction. Wiring structure for rotary electric machines. The one or more conductors form the power line of the rotary electric machine.
The rotation of any one of claims 1 to 13, wherein the relay member is a wiring portion drawn from the rotary electric machine and clamps or incorporates a wiring portion through which an electric signal lower than the power line flows. Wiring structure for electrical equipment. A case having an opening for passing a rotating member extending in the axial direction, a rotary electric machine having one or more first terminals, one or more second terminals, and the one or more first terminals. A relay member having one or more conductor portions for electrically connecting the one or more second terminals is prepared.
Assemble the relay member to the case,
A method for arranging wiring for a rotary electric machine, in which the one or more first terminals are electrically connected to the one or more conductor portions of the relay member assembled to the case. The one or more second terminals are located on the side opposite to the one or more first terminals with respect to a reference line passing through the center of the opening when viewed in the axial direction.
The method for arranging wiring for a rotary electric machine according to claim 15, wherein the reference line extends parallel to the vertical direction of the rotary electric machine in a mounted state.

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