JP2007336676A - Electric rotating machine and vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric rotating machine to which a modular stator coil and a stator core can be secured easily, and to provide a vehicle comprising the electric rotating machine. <P>SOLUTION: The electric rotating machine, i. e. a motor generator 200, comprises a rotor 250 and a stator 260. The stator 260 comprises a stator core 261, an inner resin component 4 having a stator coil 6 internally, and an outer resin component 5 secured to the stator core 261. The inner resin component 4 has a through hole 4a for receiving a bolt 11, and a coil side bus bar 9. The outer resin component 5 has a nut 10, and a lead side bus bar 8u. In a state that the coil side bus bar 9 and the lead side bus bar 8u are superimposed partially, the bolt 11 is screwed into the nut 10 thus securing the inner resin component 4 and the outer resin component 5. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rotating electrical machine and a vehicle, and more particularly to a connection structure between a plurality of conductor portions in a stator (stator) of the rotating electrical machine and a vehicle including the rotating electrical machine.

  A motor that is a rotating electrical machine includes a stator that is a mechanical part that is fixed and does not move, and a rotor that is a rotating part. The stator has a stator core and a stator coil wound around the stator core. By passing a three-phase current through the stator coil, the combined magnetic field generated due to the phase difference becomes a rotational force and the rotor rotates.

The above-described stator coil is modularized using, for example, a mold resin, and the modularized stator coil is mounted in a stator core slot. This type of stator coil is described in, for example, Japanese Patent Application Laid-Open Nos. 2000-23431 and 2004-248429.
JP 2000-23431 A JP 2004-248429 A

  Although the stator coil described in the above document is fixed to the stator core, it is difficult to fix the stator coil and the stator core that are modularized using a mold resin, and a special fixing structure is required.

  Therefore, an object of the present invention is to provide a rotating electrical machine and a vehicle including the rotating electrical machine that can easily fix a modularized stator coil and a stator core.

  A rotating electrical machine according to the present invention includes a rotor (rotor) and a stator (stator). The stator includes a stator core, a first insulator fixed integrally with the stator coil, and a second insulator fixed to the stator core. And a 1st insulator and a 2nd insulator are fixed using a fixing member. The first insulator may include a first resin portion, and the second insulator may include a second resin portion. In this case, the first resin portion and the second resin portion are fixed using a fixing member.

  The first resin portion preferably has a first lead-out portion that leads the stator coil to the outside of the first resin portion, and the second resin portion is preferably electrically connected to the stator coil inside. It has a connection conductor part and the 2nd derivation | leading-out part which derives | leads out this connection conductor part to the exterior of 2nd resin part. In this case, the first lead portion and the second lead portion may be fixed using the fixing member, and the stator coil and the connection conductor portion may be electrically connected.

  The first resin portion may have a protruding portion (a protruding portion) that protrudes so as to overlap the second resin portion. In this case, the first derivation unit is disposed along the protruding portion, the second derivation unit is disposed at a position facing the first derivation unit, and the first derivation unit and the second derivation unit are in contact with each other. What is necessary is just to fix a 1st derivation | leading-out part and a 2nd derivation | leading-out part with a fixing member.

  Examples of the fixing member include a bolt and a nut. In this case, a through hole for receiving the bolt shaft portion may be provided in one of the first and second resin portions, and a nut to which the bolt is screwed may be installed in the other of the first and second resin portions. And a 1st resin part and a 2nd resin part are fixed by screwing a volt | bolt to a nut.

  A vehicle according to the present invention includes the above-described rotating electrical machine.

  According to the present invention, since the stator of the rotating electrical machine has the first and second insulators, the first and second insulators can be easily fixed using the fixing member. At this time, since the first insulator is integrally fixed to the stator coil and the second insulator is fixed to the stator core, the stator coil is fixed to the stator core by fixing the first and second insulators. Can do. That is, it becomes possible to easily fix the stator coil modularized using an insulator such as resin and the stator core.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. In the following embodiment, an example in which the present invention is applied to a motor generator (rotary electric machine) mounted on a hybrid vehicle will be described with reference to the drawings. Various vehicles other than the hybrid vehicle (for example, a fuel cell vehicle and an electric vehicle) The present invention can also be applied to rotating electrical machines mounted on various devices such as electric vehicles including automobiles, industrial equipment, air conditioning equipment, and environmental equipment.

  In the following embodiments, the same or corresponding parts are denoted by the same reference numerals. Furthermore, it is also planned from the beginning that not all of the constituent elements of each embodiment are essential, and some constituent elements may be omitted.

  Here, first, a configuration example of the hybrid vehicle 1 on which a motor generator (rotary electric machine) described in each embodiment described later can be mounted will be described with reference to FIGS. 1 and 2. FIG. 1 is a schematic diagram illustrating a configuration example of a hybrid vehicle in which a motor generator in each of the following embodiments can be mounted. FIG. 2 is a diagram showing a schematic configuration of the motor generator shown in FIG. 1 and the vicinity thereof.

  The hybrid vehicle 1 shown in FIG. 1 is a front engine front wheel drive (FF) type vehicle, but the motor generator in each of the following embodiments is not limited to this hybrid vehicle of the FF type but also an FR (Front engine Rear). It can also be applied to a hybrid vehicle using a wheel drive system. In the case of the FR system, the configuration is slightly different from that of the FF system in that the engine is generally arranged and power is transmitted from the front engine to the rear wheels via the propeller shaft. Since the configuration is similar and the configuration of the FR hybrid vehicle is well known, the description of the FR hybrid vehicle is omitted in this specification.

  As shown in FIG. 1, the hybrid vehicle 1 includes an engine 100, a motor generator 200, a PCU (Power Control Unit) 300, a battery 400, a power split mechanism 500, a differential mechanism 600, a drive shaft 700, Drive wheels 800L and 800R, which are front wheels, are provided.

  In the example of FIG. 1, engine 100, motor generator 200, PCU 300, and power split mechanism 500 are arranged in engine room 900. The PCU 300 is provided on the side of the vehicle between the cowl and the front wheel suspension. Motor generator 200 and PCU 300 are connected by cable 3A. PCU 300 and battery 400 are connected by cable 3B. A power output device including engine 100 and motor generator 200 is connected to differential mechanism 600 through power split mechanism 500. Differential mechanism 600 is coupled to drive wheels 800L and 800R via drive shaft 700.

  Motor generator 200 is a three-phase AC synchronous motor generator, and generates driving force by AC power received from PCU 300. Motor generator 200 is also used as a generator when the hybrid vehicle 1 decelerates, etc., generates AC power by its power generation action (regenerative power generation), and outputs the generated AC power to PCU 300.

  PCU 300 converts the DC voltage received from battery 400 into an AC voltage, and drives and controls motor generator 200. The PCU 300 charges the battery 400 by converting the AC voltage generated by the motor generator 200 into a DC voltage. Power split device 500 is configured by combining various elements such as a planetary gear (not shown).

  The power output from engine 100 and / or motor generator 200 is transmitted from power split mechanism 500 to drive shaft 700 via differential mechanism 600. The driving force transmitted to the drive shaft 700 is transmitted as a rotational force to the drive wheels 800L and 800R, so that the vehicle can travel. In this case, motor generator 200 operates as an electric motor.

  On the other hand, when the vehicle is decelerated, the motor generator 200 is driven by the drive wheels 800L and 800R or the engine 100. In this case, motor generator 200 operates as a generator. The electric power generated by the motor generator 200 is stored in the battery 400 via an inverter in the PCU 300.

  Next, the configuration of the motor generator 200 and the vicinity thereof will be described in some detail with reference to FIG.

  The motor generator 200 is a rotating electrical machine having a function as an electric motor or a generator as described above, and includes a rotating shaft 240 rotatably attached to the housing 210 via a bearing 230, and a rotor attached to the rotating shaft 240. (Rotor) 250 and stator (stator) 260.

  The stator 260 has a stator core 261, and a stator coil (coil winding) is wound around the stator core 261. A coil end 262 that is an end portion of the wound stator coil is electrically connected to a power supply terminal block (connector) 220 provided in the housing 210 via a bus bar (connecting conductor portion or lead-out portion) 8. The The power supply terminal block 220 is electrically connected to the PCU 300 via the power supply cable 3A. Since the PCU 300 is electrically connected to the battery 400 via the power supply cable 3B as shown in FIG. 1, the battery 400 and the coil 262 are electrically connected to each other via the PCU 300 and the power supply cables 3A and 3B. It will be.

  As shown in FIG. 2, the motor generator 200 is connected to a differential mechanism 600 via a speed reduction mechanism 270, and the differential mechanism 600 is connected to the drive shaft 700 via a drive shaft receiving portion 710. Therefore, the power output from motor generator 200 is transmitted to drive shaft 700 via reduction mechanism 270, differential mechanism 600 and drive shaft receiving portion 710.

(Embodiment 1)
Next, a structural example of the motor generator (rotating electric machine) 200 according to the first embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a plan view showing a structural example of the stator core 261 in the first embodiment.

  As shown in FIG. 3, the stator core 261 has an annular shape, and can be formed by laminating and laminating a plurality of plate-like magnetic materials such as electromagnetic steel plates. Note that the stator core 261 may be formed of an integral member made of a magnetic material.

  In the example of FIG. 3, the stator core 261 has a plurality of (in the example of FIG. 3, 12) teeth (convex portions) 261 a that protrude inward in the radial direction, and a plurality of stator cores 261 a (see FIG. 3). In the example, 12 slots (recesses: grooves) 264 and a plurality of fixing holes 265 for fixing the stator core 261 are provided.

  A stator coil is wound around each of the teeth 261a by concentrated winding. In the first embodiment, the stator coil is modularized (unitized) using an insulating material such as a resin. Therefore, the modularized stator coil module (cassette coil) is attached to the teeth 261a. Become. In this case, the stator coil is wound around each tooth 261a through the insulating material.

  By attaching the stator coil module to the teeth 261a of the stator core 261 as described above, the slot 264 between the teeth 261a is substantially filled with a part of the stator coil module. In this way, when a current is passed through the stator coil wound around the teeth 261a, a magnetic field corresponding to the direction of the passed current is generated.

  FIG. 4 is a partial cross-sectional view of motor generator (rotary electric machine) 200 according to the first embodiment.

  As shown in FIG. 4, the stator 260 is arranged on the outer peripheral side of the stator core 261, an inner insulator component such as an inner resin component (coil component: first resin portion) 4 located on the rotor 250 side, and the stator 260. It has an outer insulator component such as a positioned outer resin component (lead component: second resin portion) 5. The inner resin part 4 is fixed to the outer resin part 5 by a fixing member. In the example of FIG. 4, the bolt 11 and the nut 10 are illustrated as a fixing member. Each resin component is typically molded using a moldable resin material such as an epoxy resin. For example, the inner component and the outer component are formed using an insulating material other than a resin such as ceramic. It may be produced.

  The inner resin part 4 receives the stator coil 6, a protruding part (a projecting part) 4 a that protrudes so as to overlap the outer resin part 5, a through hole 4 b that can receive the bolt 11, and the teeth of the stator core 261. It has a possible through hole 4c and a coil-side bus bar (connection conductor part) 9.

  The coil-side bus bar 9 is electrically connected to the stator coil 6 and leads the stator coil 6 to the outside of the inner resin part 4. In the example of FIG. 4, the coil-side bus bar 9 extends along the protruding portion 4 a of the inner resin part 4, and a part of the coil-side bus bar 9 is exposed on the surface of the inner resin part 4, thereby 6 deriving units (first deriving unit) are provided. More specifically, a part of the coil-side bus bar 9 extends along the surface on the outer resin part 5 side in the protruding part 4 a of the inner resin part 4, and is arranged between the protruding part 4 a and the outer resin part 5. . The coil-side bus bar 9 has a through hole 9a that can accept the bolt 11.

  In FIG. 5, the structural example of the inner side resin component 4 is shown. In the example of FIG. 5, the inner resin component 4 has a substantially L-shaped side surface shape, and a protruding portion 4 a is provided so as to protrude from one end portion. A plurality of (two in the example of FIG. 5) through-holes 4b are provided in the protrusion 4a. Moreover, the above-mentioned through-hole 4c is provided in the center part of the longitudinal direction (up-down direction of FIG. 5) of the inner side resin component 4, or its vicinity.

  On the other hand, the outer resin component 5 is fixed to the stator core 261. In the example of FIG. 4, a bolt 12 is inserted into a through hole 5c provided in the vicinity of one end (outer end) of the outer resin component 5 in the radial direction of the stator core 261 (left-right direction in FIG. 4). 12 is used to fix the outer resin component 5 to the stator core 261. However, the outer resin component 5 may be fixed to the stator core 261 using a fixing member or fixing means other than the bolt 12.

  In the example of FIG. 4, the bolt 12 is inserted into the fixing hole 265 of the stator core 261 so as to reach the housing (housing) 210 that can accommodate the rotor 250 and the stator 260. 261 is also fixed to the housing 210.

  The outer resin component 5 includes lead-side bus bars (connection conductor portions) 8u, 8v, and 8w that are electrically connected to the stator coil 6. As shown in FIG. 4, each lead-side bus bar 8 u, 8 v, 8 w is disposed in the outer resin part 5 at a distance from each other, and outside the outer resin part 5 at a position shifted in the circumferential direction of the stator core 261. The lead-out portion has a through hole that can receive the bolt 11. Each lead-side bus bar 8u, 8v, 8w is electrically connected to the PCU 300 through a connector such as the above-described power supply terminal block 220, for example.

  In the cross section of FIG. 4, the lead-side bus bar 8 u is led out of the outer resin part 5, and the lead-out portion (second lead-out portion) of the lead-side bus bar 8 u is provided with a through hole 8 a that can receive the bolt 11. Yes. As shown in FIG. 4, the lead-out portion of the lead-side bus bar 8 u is preferably disposed at a position facing the lead-out portion of the coil-side bus bar 9.

  The outer resin component 5 has a recess 5b in the vicinity of the other end (inner end) 5a in the radial direction of the stator core 261 (the left-right direction in FIG. 4). The nut 10 described above is installed in the recess 5b. The lead-out portion of the lead-side bus bar 8 u is extended on the nut 10.

  In FIG. 6, the structural example of the outer side resin component 5 is shown. In the example of FIG. 6, the outer resin component 5 has the same planar shape as the stator core 261, that is, an annular planar shape, and a step portion is provided on the upper surface. The lead-out portion of the lead-side bus bar 8u is exposed in the vicinity of the inner end portion 5a of the outer resin component 5, and the above-described through hole 8a is provided in the exposed lead-out portion. Further, a protruding portion 5d is provided so as to protrude outward from the outer periphery of the outer resin component 5, and the above-described through hole 5c is provided in the protruding portion 5d.

  In order to manufacture the stator 260 having the above-described structure, for example, the inner resin part 4 is manufactured by insert molding (molding) in a state where the stator coil 6 and the coil-side bus bar 9 are connected, and the insert 260 is similarly inserted. The outer resin part 5 is separately produced by molding. Then, the outer resin part 5 is attached to the stator core 261 so as to be combined with the inner resin part 4, and the bolts 11 and 12 are attached. Note that the inner resin part 4 and the outer resin part 5 may be respectively molded by insert molding and attached to the stator core 261.

  Since the inner resin part 4 and the outer resin part 5 can be fixed simply by attaching the fixing members such as the bolts 11 and 12 as described above, the inner resin part 4 and the outer resin part 5 are easily fixed. be able to. At this time, since the inner resin component 4 has the stator coil 6 inside and the outer resin component 5 is fixed to the stator core 261, the coil module having the stator coil 6 can be easily fixed to the stator core 261. Can do.

  In the case of the first embodiment, the lead-side bus bar 8u and the coil-side bus bar 9 can be simultaneously connected by the bolt 11, so that the stator coil 6 and the lead-side bus bar 8u can be connected at the same time. It can also be electrically connected. Therefore, the tact time of the connection process can be shortened.

  Furthermore, by using a fastening member that can be tightened, such as the bolt 11, one of the lead-side bus bar 8u and the coil-side bus bar 9 can be brought into strong contact with the other. Moreover, when the resin part is provided above and below these, the connection part of the lead side bus bar 8u and the coil side bus bar 9 can be reinforced, and the reliability of the connection part can also be improved.

  In addition, by adopting a resin molded product such as the inner resin part 4 or the outer resin part 5, the thermal conductivity can be improved. Moreover, contacting the end surfaces of the inner resin part 4 and the outer resin part 5 as in the example of FIG. 4 can also contribute to an improvement in thermal conductivity. Therefore, the heat dissipation characteristics can be improved.

  In the above-described first embodiment, the inner resin part 4 is provided with the through hole 4a for receiving the shaft portion of the bolt 11 and the nut 10 on which the bolt 11 is screwed to the outer resin part 5 is installed. The through hole for receiving the shaft portion and the nut may be installed in either the inner resin part 4 or the outer resin part 5. Moreover, the attachment position of the volt | bolt 11 and the nut 10 can also select arbitrary positions other than the above.

  Furthermore, when the inner side resin part 4 and the outer side resin part 5 are fixed without providing a through hole for inserting a bolt in the lead side bus bar and the coil side bus bar, the lead side bus bar and the coil side bus bar are merely brought into contact with each other. A configuration can also be employed. Further, for example, by inserting a conductive member having a hardness lower than that between the lead-side bus bar and the coil-side bus bar, the substantial contact area between them can be increased, and the connection resistance can be reduced. Conceivable.

  Further, the shapes of the inner resin part 4 and the outer resin part 5 can be arbitrarily modified. For example, the inner resin component 4 is provided with a concave portion, the outer resin component 5 is provided with a convex portion, and the convex portion of the outer resin component 5 is fitted into the concave portion of the inner resin component 4. It is also conceivable to increase the contact area between the two.

(Embodiment 2)
Next, Embodiment 2 of the present invention will be described with reference to FIGS.

  In the above-described first embodiment, the bolt 11 and the nut 10 are exemplified as the fixing members for fixing the inner resin part 4 and the outer resin part 5, but other fixing members and fixing means may be used. Is possible.

  For example, as shown in FIGS. 7 and 8, a U-shaped clamp 14 may be employed. As shown in FIGS. 7 and 8, the clamp tool 14 has clamping portions (clamping portions) 14a at both ends, and the lead-side bus bar 8u and the coil-side bus bar 9 are directly or indirectly connected to the clamping portion 14a. Thus, the lead-side bus bar 8u and the coil-side bus bar 9 can be fixed, and the inner resin part 4 and the outer resin part 5 can be fixed.

  At this time, the depth of the concave portion 5b provided in the vicinity of the end portion 5a of the outer resin component 5 is made deeper than the thickness of the clamping portion 14a provided at one end of the clamp tool 14, and the width of the concave portion 5b (the radial direction of the stator core 261) The width of the clamp tool 14 can be easily mounted by making the width in the left-right direction in FIG. 7 narrower than the width of the clamping portion 14 a on one end side of the clamp tool 14.

  As shown in FIG. 8, the angle θ formed between the clamping portion 14a and the main body portion 14b of the clamp tool 14 is typically an acute angle. Thereby, when the clamp tool 14 is mounted on each resin component or bus bar, a force can be applied to these. For example, in the example of FIG. 7, a force can be applied so that the protruding portion 4 a of the inner resin component 4, the lead-side bus bar 8 u, and the coil-side bus bar 9 are firmly in contact with each other.

  The configuration of the clamp tool 14 is not limited to that shown in FIGS. 7 and 8 as long as the inner resin part 4 and the outer resin part 5 can be fixed, and can be arbitrarily selected. In the example of FIG. 7, the case where the protruding portion 4 a of the inner resin component 4, the lead-side bus bar 8 u, and the coil-side bus bar 9 are fixed has been described. The lead-side bus bar 8u and the coil-side bus bar 9 may be fixed together with a part thereof, or the lead-side bus bar 8u and the coil-side bus bar 9 may be directly fixed by the clamp tool 14. The material of the clamp 14 is typically a metal or the like, but any material other than metal can be used as long as it is an elastically deformable material.

  Although the embodiments of the present invention have been described as described above, it is also planned from the beginning to appropriately combine the configurations of the above-described embodiments. Further, it should be considered that the embodiment disclosed this time is illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, and includes meanings equivalent to the terms of the claims and all modifications within the scope.

It is the schematic which shows the structural example of the hybrid vehicle which can mount the motor generator in each embodiment of this invention. It is a figure which shows schematic structure of the motor generator shown in FIG. 1, and its vicinity. It is a top view which shows the structural example of the stator core in Embodiment 1 of this invention. It is sectional drawing which shows a part of motor generator in Embodiment 1 of this invention. It is a perspective view which shows the structural example of the inner side resin component in Embodiment 1 of this invention. It is a perspective view which shows the example of a part of structure of the outer side resin component in Embodiment 1 of this invention. It is sectional drawing which shows a part of motor generator in Embodiment 2 of this invention. It is a figure which shows the structural example of the clamp tool in Embodiment 2 of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 Hybrid vehicle, 3, 3A, 3B cable, 4 Inner resin parts, 4a, 5d Protrusion part, 4b, 4c, 5c, 8a, 9a Through hole, 5 Outer resin part, 5a End part, 5b Recessed part, 6 Stator coil, 8, 8u, 8v, 8w Lead side bus bar, 9 Coil side bus bar, 10 Nut, 11, 12 bolt, 14 Clamping tool, 14a Clamping part, 14b Body part, 100 Engine, 200 Motor generator, 210 Housing, 220 Power supply terminal Table, 230 Bearing, 240 Rotating shaft, 250 Rotor, 260 Stator, 261 Stator core, 262 Coil end, 270 Deceleration mechanism, 300 PCU, 400 Battery, 500 Power split mechanism, 600 Differential mechanism, 700 Drive shaft, 710 Drive shaft receiver , 800L, 800R drive wheels, 900 engine room.

Claims (6)

A rotor and a stator,
The stator includes a stator core, a first insulator fixed integrally with the stator coil, and a second insulator fixed to the stator core,
A rotating electrical machine in which the first insulator and the second insulator are fixed using a fixing member. The first insulator includes a first resin portion; the second insulator includes a second resin portion;
The rotating electrical machine according to claim 1, wherein the first resin portion and the second resin portion are fixed using the fixing member. The first resin portion has a first lead-out portion that leads the stator coil to the outside of the first resin portion,
The second resin portion includes a connection conductor portion that is electrically connected to the stator coil inside, and a second lead-out portion that leads the connection conductor portion to the outside of the second resin portion,
The rotating electrical machine according to claim 2, wherein the fixing member is used to fix the first lead-out part and the second lead-out part and to electrically connect the stator coil and the connection conductor part. . The first resin portion has a protruding portion that protrudes so as to overlap the second resin portion,
Arranging the first lead-out portion along the projecting portion;
Arranging the second derivation unit at a position facing the first derivation unit;
The rotating electrical machine according to claim 3, wherein the first lead-out part and the second lead-out part are fixed by the fixing member so that the first lead-out part and the second lead-out part come into contact with each other. The fixing member includes a bolt and a nut,
One of the first and second resin parts is provided with a through hole for receiving the shaft part of the bolt,
The nut on which the bolt is screwed is installed on the other of the first and second resin parts,
The rotating electrical machine according to any one of claims 2 to 4, wherein the first resin portion and the second resin portion are fixed by screwing the bolt to the nut.   A vehicle comprising the rotating electrical machine according to any one of claims 1 to 5.

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