JP2012218578A - Driving unit with inverter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain unpleasant noise, by restraining excitation force of a case, in a driving unit with an inverter.SOLUTION: This driving unit 57 with the inverter includes a first motor generator 16 and a second motor generator 20 arranged in a driving unit case 60, and an inverter unit 68 fixed to the driving unit case 60. A first rotary shaft 32 for constituting the first motor generator 16 is arranged in parallel to a second rotary shaft 40 for constituting the second motor generator 20. The respective motor generators 16 and 20 have rotors 44 and 52 and stators 46 and 54. The stators 46 and 54 are eccentrically arranged opposite to the rotors 44 and 52 so that thickness of an inverter unit 68 side gaps become minimum in thickness of cylindrical gaps on the inside in the radial direction between the stators 46 and 54 and the rotors 44 and 52, respectively.

Description

  The present invention includes a first rotating electrical machine and a second rotating electrical machine provided in a case, and an inverter unit that is fixed to the case and drives the first rotating electrical machine and the second rotating electrical machine. The 1st rotating shaft which comprises is related with the drive unit with an inverter arrange | positioned in parallel with the 2nd rotating shaft which comprises a 2nd rotary electric machine.

  2. Description of the Related Art Conventionally, a hybrid vehicle, which is an electric vehicle equipped with an engine and a traveling motor and drives wheels using at least one of the engine and the traveling motor as a drive source, has been considered and implemented. In such a hybrid vehicle, the first motor generator (MG1) that is mainly used as a generator but may also be used as a motor, and mainly used as a traveling motor, is also used as a generator. It is conceivable to provide a second motor generator (MG2) that may be used, and an inverter unit that drives the first and second motor generators.

  For example, Patent Document 1 houses a generator motor disposed on a first axis, a drive motor disposed on a second axis parallel to the first axis, a generator motor, and a drive motor. A drive device having a drive device case, a generator motor inverter connected to the generator motor, and a drive motor inverter connected to the drive motor is described. An inverter case is disposed in the drive device case, and the inverter device is disposed in the inverter case. The inverter device includes a generator motor inverter and a drive motor inverter.

Japanese Patent No. 3891533

  In the case of the drive device described in Patent Document 1 above, the rotor is eccentrically arranged in either direction with respect to the stator due to dimensional errors or assembly errors of components in each of the generator motor and the drive motor. It cannot be said that there is no possibility. In this case, in use, the radial thickness of the space gap between the rotor and the stator in the generator motor or drive motor becomes nonuniform in the circumferential direction. That is, the thickness of the space gap is increased on the eccentric side of the stator with respect to the rotor, and the thickness of the space gap is decreased on the anti-eccentric side of the stator with respect to the rotor.

  On the other hand, since the stator constituting the motor is supported by the case when the motor is used, when the motor generates torque, the reaction of the attractive force and the repulsive force due to the electromagnetic force acting between the stator and the rotor Excitation force acts on the stator, and the excitation force of the stator is also transmitted to the case. That is, the case vibration is excited. In this case, the excitation force increases as the gap between the stator and the rotor decreases, and the excitation force decreases as the gap increases. Then, there is a possibility that unpleasant noise (motor noise) may be generated in the passenger compartment of the vehicle on which the drive device is mounted due to the radiated sound generated from the case or the vibration transmission from the case to the vehicle body.

  In addition, as described above, in the configuration of Patent Document 1, there is a possibility that the stator is eccentric with respect to the rotor due to dimensional errors or assembly errors of the component parts, and the thickness of the space gap becomes uneven in the circumferential direction. In this case, a level difference in the circumferential direction may occur with respect to the radial excitation force generated in the case. For this reason, when two motors are supported on the case as described above, the radial excitation force generated in the case increases, and noise may increase.

  An object of the present invention is to suppress unpleasant noise by suppressing the excitation force of a case in a drive unit with an inverter.

  The drive unit with an inverter according to the present invention is fixed to the case with the first rotating electrical machine and the second rotating electrical machine provided in the case, and is disposed on the same side with respect to the first rotating electrical machine and the second rotating electrical machine. An inverter unit that drives the first rotating electrical machine and the second rotating electrical machine, and the first rotating shaft that constitutes the first rotating electrical machine is disposed in parallel with the second rotating shaft that constitutes the second rotating electrical machine, The first rotating electrical machine is a first rotor fixed to the first rotating shaft and a first stator fixed to the case, and the thickness of the cylindrical gap on the radially inner side between the first rotor and the first rotor A second stator that is fixed to the second rotating shaft, the first stator being eccentrically opposed to the first rotor so that the thickness of the gap on the inverter unit side is minimized. And the second stay fixed to the case In the thickness of the cylindrical gap on the radially inner side between the second rotor and the second rotor, the second gap is arranged eccentrically and opposed to the second rotor so that the thickness of the gap on the inverter unit side is minimized. It is a drive unit with an inverter characterized by including 2 stators.

  In the drive unit with an inverter according to the present invention, preferably, the inverter unit includes a first inverter that drives the first rotating electrical machine and a second inverter that drives the second rotating electrical machine.

  According to the inverter-equipped drive unit according to the present invention, in each of the first rotating electric machine and the second rotating electric machine, among the gap thicknesses between the stator and the rotor, the thickness of the gap on the inverter side is minimized. The stator is eccentric with respect to the rotor. For this reason, since a large excitation force is input to a portion where the sensitivity of the case vibration suppression is high due to the mass effect of the inverter, the case excitation force can be suppressed and unpleasant noise can be suppressed.

1 is a schematic diagram showing the configuration of a drive device for a hybrid vehicle including an example drive unit with an inverter according to an embodiment of the present invention. It is a schematic sectional drawing which shows the drive unit with an inverter of an example of embodiment of this invention. It is a schematic diagram which shows the structure which supported one rotary electric machine in the case for demonstrating the effect of embodiment of this invention.

  Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. 1 to 3 show an example of an embodiment of the present invention.

  The drive unit with an inverter of the present embodiment is used by being mounted on a hybrid vehicle that is an electric vehicle. As shown in FIG. 1, the drive device 10 provided in the hybrid vehicle includes an engine 12, a first motor generator (MG1) 16 that is a first rotating electrical machine connected to the engine 12 via a planetary gear device 14, and A second motor generator (MG2) 20 that is a second rotating electrical machine connected to the first motor generator 16 via a planetary gear device 14 and a gear device 18, a second gear device 22, and a differential device (not shown). . The first motor generator 16 is mainly used as a generator, but may be used as a motor. The second motor generator 20 is mainly used as a traveling motor, but may be used as a generator.

  The planetary gear device 14 can divide the power from the engine 12 into a route to the gear device 18 and a route to the first motor generator 16. The rotating shaft 23 of the engine 12 is connected to a carrier 26 that supports a plurality of planetary gears (only one planetary gear is shown in the illustrated example) 24 of the planetary gear unit 14. The planetary gear device 14 includes a plurality of planetary gears 24, a sun gear 28 that meshes radially inward with the plurality of planetary gears 24, and a ring gear 30 that meshes radially outward with the plurality of planetary gears 24. The sun gear 28 is connected to the first rotating shaft 32 of the first motor generator 16. The ring gear 30 is connected to an output shaft 34, and the output shaft 34 is fixed to a counter drive gear 36 that constitutes the gear device 18.

  The counter drive gear 36 is meshed with a counter driven gear 38 constituting the gear device 18, and its rotation is decelerated by the second gear device 22, and distributed and transmitted to left and right wheels (not shown) via a differential device (not shown). Is done. The counter driven gear 38 is meshed with an output gear 42 fixed to the second rotating shaft 40 of the second motor generator 20.

  The first motor generator 16 is a three-phase permanent magnet type synchronous machine or induction machine. The first motor generator 16 includes a first rotor 44 fixed to the first rotating shaft 32, and a first stator 46 disposed to face the radially outer side of the first rotor 44. The first stator 46 has a stator coil wound around a plurality of locations in the circumferential direction of a stator core made of a magnetic material. In the first rotor 44, permanent magnets are arranged at a plurality of locations in the circumferential direction of the rotor core made of a magnetic material, or a rotor coil is wound around a plurality of locations in the circumferential direction of the rotor core.

  A first inverter 48 (FIG. 2) is connected to the first motor generator 16 via a three-phase cable and bus bars 50 u, 50 v, 50 w, and the first inverter 48 drives the first motor generator 16. Although the detailed illustration of the first inverter 48 is omitted, each of the first inverters 48 has a three-phase arm in which switching elements such as two transistors and IGBTs are connected in series. Are connected to the first motor generator 16 via the cables and the bus bars 50u, 50v, 50w.

  A battery (not shown) is connected to the first inverter 48. On / off switching of the first inverter 48 is controlled by an ECU (Electronic Control Unit) (not shown) which is a control unit. The electric power generated by driving the first motor generator 16 is charged in the battery.

  The second motor generator 20 is configured in the same manner as the first motor generator 16, and the second rotor 52 fixed to the second rotating shaft 40 and the second rotor 52 disposed opposite to each other on the radially outer side of the second rotor 52. And a stator 54. As for the 2nd stator 54, the stator coil is wound by the circumferential direction several places of the stator core comprised with a magnetic material. In the second rotor 52, permanent magnets are arranged at a plurality of locations in the circumferential direction of the rotor core made of a magnetic material, or rotor coils are wound around a plurality of locations in the circumferential direction of the rotor core.

  A second inverter 56 (FIG. 2) is connected to the second motor generator 20 via a three-phase cable and bus bars 58 u, 58 v, 58 w, and the second inverter 56 drives the second motor generator 20. Although the detailed illustration of the second inverter 56 is omitted, each of the second inverters 56 has a three-phase arm in which switching elements such as two transistors and IGBTs are connected in series, and the midpoint of each phase arm corresponds. It is connected to the second motor generator 20 via phase cables and bus bars 58u, 58v, 58w.

  A battery (not shown) is connected to the second inverter 56. The second inverter 56 is switched on and off by an ECU (not shown). The regenerative power collected by the second motor generator 20 during braking of a wheel (not shown) is charged in the battery.

  Moreover, the 1st rotating shaft 32 and the 2nd rotating shaft 40 are each arrange | positioned in parallel with the drive unit case 60 shown in FIG. 2, and are each supported rotatably.

  The configuration of the hybrid vehicle drive device is not limited to the configuration shown in FIG. 1, and includes an engine and two rotating electric machines, and at least one rotating electric machine of the two rotating electric machines is a travel motor. As long as it is used, various configurations can be adopted.

  Next, the drive unit with an inverter of this embodiment will be described with reference to FIG. As shown in FIG. 2, the inverter-equipped drive unit 57 includes a drive unit case 60, first and second motor generators 16 and 20 provided in the drive unit case 60, and an inverter unit 68. That is, the drive unit case 60 is a control device coupled and fixed to the upper side of the upper body 64 provided at the upper end of the case main body 62 and the case main body 62 that accommodates the first and second motor generators 16 and 20. And an inverter case 66 as a case. Inside the inverter case 66, a first inverter 48 and a second inverter 56 are attached. The first inverter 48 and the second inverter 56 constitute an inverter unit 68. For this reason, the inverter unit 68 is fixed to the drive unit case 60 and is disposed on the upper side which is the same side with respect to the first motor generator 16 and the second motor generator 20. In addition, the 1st inverter 48 and the 2nd inverter 56 can also comprise an inverter unit by arrange | positioning the electronic component which comprises each on the common single board | substrate.

  Further, a control board constituting the ECU and various electronic components on the control board can be provided in the inverter case 66 together with the inverter unit 68. Further, a smoothing capacitor (not shown) connected between the first inverter 48 and the second inverter 56 and a battery (not shown) can be provided in the inverter case 66 together with the inverter unit 68. Further, a transaxle unit (T / A) can be configured by accommodating a power transmission unit including the planetary gear device 14 in the drive unit case 60.

  Further, in the first motor generator 16, the first stator 46 is coupled and fixed to the case body 62 with bolts or the like. In addition, both end portions of the first rotating shaft 32 are rotatably supported by the case main body 62 by bearings or the like, and the first rotor 44 provided concentrically around the first rotating shaft 32 is disposed radially outside the first rotor 44. A stator 46 is disposed oppositely. A cylindrical accommodation hole can be integrally provided inside the case body 62, and the first stator 46 can be fitted and fixed in the accommodation hole.

  Further, the axis O1a of the first stator 46 is shifted by a length t1 on the lower side, which is the opposite side to the inverter unit 68 side, with respect to the axis O1b of the first rotor 44. And the 1st stator 46 is the inverter unit 68 side (upper side of FIG. 2) among the radial direction thickness of the perimeter of the substantially cylindrical cylindrical gap G1 radially inward with the first rotor 44. The first stator 46 is arranged eccentrically and opposed to the first rotor 44 so that the radial thickness D1 of the gap is minimized. For example, the support portion for the case main body 62 of the first rotating shaft 32 is disposed so as to be displaced upward with respect to the axis O1a of the first stator 46. In FIG. 2, the size and the amount of eccentricity of the cylindrical gap G1 between the first stator 46 and the first rotor 44 are exaggerated.

  In the second motor generator 20, the second stator 54 is coupled and fixed to the case body 62 with bolts or the like. Further, both end portions of the second rotating shaft 40 are rotatably supported by the case main body 62 by bearings or the like, and the second rotor 52 is provided radially outside the second rotor 52 provided concentrically around the second rotating shaft 40. A stator 54 is disposed opposite to the stator 54. In this case, the second rotating shaft 40 is supported by the case body 62 so as to be separated from the first rotating shaft 32 in parallel with each other. A cylindrical accommodation hole can be integrally provided inside the case body 62, and the second stator 54 can be fitted and fixed in the accommodation hole.

  Further, the axis O2a of the second stator 54 is shifted downward by a length t2 that is opposite to the inverter unit 68 side with respect to the axis O2b of the second rotor 52. The second stator 54 is located on the inverter unit 68 side (upper side in FIG. 2) in the radial thickness of the entire circumference of the substantially cylindrical cylindrical gap G2 radially inward with the second rotor 52. The second stator 54 is arranged eccentrically and opposed to the second rotor 52 so that the radial thickness D2 of the gap is minimized. For example, the support portion for the case main body 62 of the second rotating shaft 40 is disposed so as to be shifted upward with respect to the axis O2a of the second stator 54. In this case, the first motor generator 16 is provided in the case body 62 so as to be arranged around the first rotation shaft 32, and the second motor generator 20 is arranged around the second rotation shaft 40. The case body 62 is provided. In FIG. 2, the size and the amount of eccentricity of the cylindrical gap G2 between the second stator 54 and the second rotor 52 are exaggerated.

  According to the inverter-equipped drive unit 57, the thicknesses of the cylindrical gaps G1 and G2 between the corresponding stators 46 and 54 and the rotors 44 and 52 in the first motor generator 16 and the second motor generator 20, respectively. Of these, the stators 46 and 54 are eccentric with respect to the rotors 44 and 52 so that the gap thicknesses D1 and D2 on the inverter unit 68 side are minimized. On the other hand, the electromagnetic force acting between the stators 46 and 54 and the rotors 44 and 52 increases at the portion where the gaps G1 and G2 are minimum. For this reason, due to the mass effect of the inverter unit 68, that is, the weight effect, a large excitation force is input to the portion of the drive unit case 60 where the vibration suppression sensitivity is high. For this reason, the exciting force of the drive unit case 60 can be sufficiently suppressed, and unpleasant noise can be suppressed.

  FIG. 3 is a schematic diagram showing a configuration in which one rotating electrical machine is supported by a case for explaining the effect of the embodiment of the present invention. In the configuration of FIG. 3, the rotating electrical machine 72 is supported on the case 70. The rotating electrical machine 72 includes a stator 74 fixed in the case 70 and a rotor 75 disposed to face the inside of the stator 74 in the radial direction. An inverter unit 76 connected to the rotating electrical machine 72 and driving the rotating electrical machine 72 is fixed to the upper side of the case 70, and the inverter unit 76 is accommodated in an inverter case 78 fixed to the case 70. In the stator 74, the gap on the inverter unit 76 side (upper side in FIG. 3) with respect to the rotor 75 is minimized, that is, the axis O1a of the stator 74 is below the axis O1b of the rotor 75 (FIG. 3). Are arranged eccentrically so as to be displaced in the direction of arrow α).

  In such a configuration, between the stator 74 and the rotor 75, the attractive force and the repulsive force due to electromagnetic force increase at the portion where the gap D1 on the inverter unit 76 side becomes small, and the excitation force on the stator 74 tends to increase. However, the vibration level of the portion corresponding to the gap D1 can be suppressed by the mass effect of the inverter unit 76. For this reason, the vibration level can be suppressed in all the circumferential portions of the stator 74. As can be understood from the above description, in the embodiment in which the first and second motor generators 16 and 20 as the two rotating electric machines are accommodated in the drive unit case 60 shown in FIG. The excitation force of the drive unit case 60 can be sufficiently suppressed, and unpleasant noise can be suppressed.

  As a result, when the inverter-equipped drive unit 57 of the present embodiment is mounted on a vehicle, unpleasant noise due to the vibration of the drive unit case 60 can be sufficiently suppressed for passengers in the vehicle cabin. In the configuration in which the two motor generators 16 and 20 are accommodated in the common drive unit case 60 as described above, the stators 46 and 54 and the rotor 44 are disposed on the same side where the inverter unit 68 exists in both the motor generators 16 and 20. , 52 are arranged eccentrically with respect to the rotors 44, 52 so that the gap between the motor generators 16, 20 can be reduced simultaneously.

  DESCRIPTION OF SYMBOLS 10 Drive apparatus, 12 Engine, 14 Planetary gear apparatus, 16 1st motor generator (MG1), 18 gear apparatus, 20 2nd motor generator (MG2), 22 2nd gear apparatus, 23 Rotating shaft, 24 Planetary gear, 26 Carrier, 28 sun gear, 30 ring gear, 32 first rotating shaft, 34 output shaft, 36 counter drive gear, 38 counter driven gear, 40 second rotating shaft, 42 output gear, 44 first rotor, 46 first stator, 48 first inverter, 50u, 50v, 50w bus bar, 52 second rotor, 54 second stator, 56 second inverter, 57 drive unit with inverter, 58u, 58v, 58w bus bar, 60 drive unit case, 62 case body, 64 upper wall, 66 Inverter case, 68 inches Barter unit, 70 case, 72 rotating electrical machine, 74 stator, 75 rotor, 76 inverter unit, 78 inverter case.

Claims (1)

A first rotating electric machine and a second rotating electric machine provided in the case;
An inverter unit fixed to the case and disposed on the same side with respect to the first rotating electric machine and the second rotating electric machine, and driving the first rotating electric machine and the second rotating electric machine,
The first rotating shaft constituting the first rotating electrical machine is arranged in parallel with the second rotating shaft constituting the second rotating electrical machine,
The first rotating electrical machine is a first rotor fixed to the first rotating shaft and a first stator fixed to the case, and the thickness of the cylindrical gap on the radially inner side between the first rotor and the first rotor A first stator that is eccentrically opposed to the first rotor so that the thickness of the gap on the inverter unit side is minimized,
The second rotating electrical machine is a second rotor fixed to the second rotating shaft and a second stator fixed to the case, and the thickness of the radially inner cylindrical gap between the second rotor and the second rotor A drive unit with an inverter, comprising: a second stator that is eccentrically opposed to the second rotor so that the thickness of the gap on the inverter unit side is minimized.

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