JP2008125221A - Driving device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a driving device for a vehicle wherein a motor body, an inverter element, and a control device can be sufficiently cooled by a simple structure. <P>SOLUTION: The driving device includes the motor body 21, a fan cover 22, the inverter element 16 installed at the fan cover 22, and the control device 23. A rotating shaft 1 supports a rotor core 4 that is supported by bearings 2 provided at ends of a cylindrical stator frame 10 having a stator core 8 installed on its inner circumferential surface and rotated in the stator core 8. The motor body is obtained by installing a cooling fan 12 at one end of the rotating shaft protruded from the stator frame 10. The fan cover is installed at the stator frame 10 so that it covers the cooling fan 12 with an elastic installation member 11 and guides cooling air to the outer circumferential surface of the stator frame 10. The control device is installed on the stator frame 10 via an elastic supporting body 17. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle drive device in which an electric motor main body driven by an inverter and a control device for controlling the inverter are arranged integrally or close to each other.

  In the current vehicle drive system, particularly in the railway vehicle drive system, the main motor is arranged in the carriage, and the control apparatus is arranged under the floor of the vehicle. Various benefits are born.

  As a first merit, the conventional main motor and the control device are connected by a cable. However, if they are arranged close to each other, the wiring distance is shortened or the wiring is unnecessary, so that the cost is reduced. Further, since no wiring noise is generated, the influence of noise on the signal line is eliminated.

  As a second merit, when the permanent magnet synchronous motor is used as a main motor in the future from the viewpoint of energy saving, the main motor and the control device will individually correspond to each other in 1: 1, but at that time, the control device The total cost including the main motor and the control device can be reduced.

  As a third merit, since the space under the vehicle occupied by the control device is vacant, it is possible to effectively use other power supply devices installed in this portion or a two-story vehicle. There are many other benefits.

  In this way, when the main motor and the control device are integrated, various merits are produced. However, it is necessary to reduce the size of the main motor and the control device so that they can be accommodated in a cart with many dimensional constraints. Further, since both the main motor and the control device generate heat, they must be sufficiently cooled so as not to exceed the allowable temperature.

  There are two types of main motors: the open type and the self-ventilated type. In the open type, a blower for taking in outside air is provided in a place different from the main motor to forcibly ventilate the inside of the machine. In the self-ventilation type, a fan connected to the rotating shaft is provided in the machine, and the fan is ventilated using the suction force of the fan during operation.

  However, in these cooling systems, the inside and outside of the machine communicate with each other, and dust enters the machine, so that regular maintenance (disassembly and cleaning) is required. Therefore, in recent years, a fully-enclosed fan type main motor has been developed in which the main motor body is hermetically sealed to prevent dust from entering the machine, and the fan connected to the rotating shaft blows air to the outer peripheral surface of the main motor body. Has been.

  As a cooling method for a heating element such as an inverter of a control device, a combination of a heat radiating fin and a heat pipe is generally used. In this cooling system, the heat generated by the heating element is transported to a place where it is exposed to the outside air by a heat pipe or the like, is conducted to a heat radiation fin having a large area, and is then cooled by transferring heat to the outside air. Since this radiation fin occupies about 60% of the volume of the control device, downsizing is an important issue in order to fit the control device in the carriage.

As a vehicle drive device in which such an electric motor and a control device are integrated, there is one described in Patent Document 1, for example. In this document, a control device is provided in the upper part of the electric motor, and the coolant passes through both the electric motor and the control device. In the electric motor, the coolant passes through the outer periphery of the stator and the vicinity of the bearing.
JP-A-8-336261

The conventional vehicle drive device described above has the following problems to be solved.
The coolant transported by an external pump or the like first passes through a duct provided in the stator portion of the electric motor, and then flows to the control device. Then, it returns to the external pump again via the stator part of the electric motor. In such a path of the coolant, the coolant takes heat first when passing through the stator portion of the electric motor. Therefore, when the coolant reaches the control device, the coolant temperature has already increased. There is a possibility that the control device cannot be cooled efficiently. Further, since the temperature of the coolant that recirculates from the control device back to the electric motor is considered to have already increased, the cooling performance is reduced.

  As a next problem, in the case of a circulating flow, a radiator for radiating the warmed coolant is necessary. Since heat generated in both the electric motor and the control device is transported to the radiator, a large radiator, a forced air cooling fan, and the like are required to obtain sufficient cooling performance.

  As another problem, a cooling path that repeats complicated branching and merging and a long path are provided, and it is considered that the pressure loss in the flow path is large. If the cooling liquid is forcibly fed by a pump or the like, there is a high possibility that liquid leakage will occur at the connection portion.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a vehicle drive device that can sufficiently cool an electric motor body, an inverter element, and a control device with a simple structure.

  In order to solve the above-mentioned problems, the present invention supports a rotor core that is supported by a bearing provided at an end of a cylindrical stator frame having a stator core attached to the inner periphery thereof and rotates on the inner periphery of the stator core. An electric motor body in which a cooling fan is attached to one end of the rotating shaft protruding from the stator frame, and a fan that covers the cooling fan by an elastic attachment member and is attached to the stator frame and guides cooling air to the outer periphery of the stator frame A cover, a plurality of inverter elements attached to the fan cover, and a control device attached to the stator frame via an elastic support member are provided.

  ADVANTAGE OF THE INVENTION According to this invention, the drive device for vehicles which can fully cool an electric motor main body, an inverter element, and a control apparatus with simple structure can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(First embodiment)
(Constitution)
FIG. 1 is a longitudinal sectional view showing the configuration of the vehicle drive device according to the first embodiment of the present invention. FIG. 2 is a sectional view taken along the line II-II in FIG. FIG. 2B is an axial cross-sectional view of a central portion and a right end portion where the mounting position of the vehicle drive device shown in FIG. 1 is avoided.

  As shown in these drawings, the rotor core 4 is formed in a cylindrical shape on the outer periphery in the vicinity of the central portion in the axial direction of the rotary shaft 1. The rotor core 4 is supported by the rotor core presser 6 so as to be sandwiched from both side surfaces in the axial direction. The rotor core 4 and the rotor core retainer 6 are formed with a plurality of circular rotor ducts 5 penetrating both in the axial direction. A cylindrical stator iron core 8 formed of a laminated iron core is provided on the outer peripheral portion of the rotor iron core 4 through an air gap (air gap).

  A plurality of grooves are formed in the inner peripheral portion of the stator core 8 in the axial direction, and the stator coil 7 is embedded in the grooves. The coil ends of the stator coil 7 protrude in the axial direction from both side surfaces of the stator core 8. A cylindrical stator frame 10 is provided on the outer periphery of the stator core 8, and a housing 3 is provided at an end thereof. A bearing 2 is mounted between the housing 3 and the rotating shaft 1.

  The rotating shaft 1 and the housing 3 are rotatably supported by a bearing 2. A cooling fan 12 is provided at one end of the rotating shaft 1. The cooling fan 12 has a plurality of radial-shaped wings attached in the radial direction so as to correspond to both rotations of the rotary shaft 1. A fan cover 22 is installed so as to cover the cooling fan 12.

  A plurality of inverter elements 16 are distributed and attached inside the fan cover 22, and the fan cover 22 is elastically supported by the attachment member 11 on the electric motor main body 21, and the control device 23 is attached to the electric motor main body 21 by the elastic support member 17. The configuration.

  The inverter element 16 is basically distributed in a substantially equal distribution in the circumferential direction of the fan cover 22 when the electric motor body 21 is viewed from the axial direction, but avoids the mounting position of the fan cover 22 on the electric motor body 21, Or you may make it arrange | position avoiding the handles 15a and 15b for attaching to the trolley | bogie frame 25, and the control apparatus 23. FIG.

  As shown in FIGS. 3A and 3B, the vehicle drive device of the present embodiment configured as described above is attached to the carriage frame 25 by the handles 15a and 15b and rolls on the rail 28. The wheel 27 to be driven is driven.

(Function)
The operation of the vehicle drive device of the present embodiment configured as described above will be described.
During the operation of the electric motor main body 21, the wind sucked from the fan wind inlet 13 with the rotation of the cooling fan 12 utilizing the rotation of the rotating shaft 1 is blown out in the radial direction from the cooling fan 12 by centrifugal force. The blown cooling air flows along the fan cover 22 and is exhausted. Since the blades of the cooling fan 12 have a radial shape, both the forward and reverse rotations of the electric motor have the same flow that is reversed left and right.

  Since the inverter element 16 is distributed and attached to the fan cover 22, the cooling air directly hits the inverter element 16 to radiate heat. Further, the heat generated by the inverter element 16 is cooled by heat conduction to the fan cover 22. For example, the inverter element 16 has 12 heat sources distributed and has a larger heat dissipation effect when 12 1200Vs are arranged than when 3 voltages 3300V are arranged. Next, the fan wind flows in the longitudinal direction of the outer peripheral surface of the electric motor main body 21 to cool the control device 23.

  In the present embodiment, the fan cover 22 is elastically supported by the electric motor main body 21 and the control device 23 is attached to the electric motor main body 21 by the elastic support member 17. Therefore, the inverter element 16 and the control device 23 are connected to the wheels 27. It is possible to insulate from the vibration of the rail 28 and the electric motor main body 21.

(effect)
With the above action, the heat generated in the inverter element 16 can be efficiently cooled by the heat conduction to the fan cover 22 while the heat transfer coefficient is improved by the cooling air blown from the cooling fan 12.
In addition, since the plurality of inverter elements 16 are arranged in a distributed manner, the single heat generation from the inverter elements 16 is reduced and the surface area is increased, so that the cooling can be efficiently performed.

  Further, the fan cover 22 is elastically supported by the electric motor main body 21 and the control device 23 is attached to the electric motor main body 21 by the elastic support member 17, so that the inverter element 16 and the control device 23 are connected to the wheels 27, the rails 28, and the electric motor main body 21. It can be effectively protected from vibration.

(Second Embodiment)
FIG. 4 is a longitudinal sectional view showing the configuration of the vehicle drive device according to the second embodiment of the present invention, and FIG. 5 is a sectional view taken along the line VV of FIG. In each figure, the same elements as those in FIGS. 1 to 3 are denoted by the same reference numerals, and the description thereof is omitted. In the present embodiment, the inverter element 16 is attached to the outer periphery of the fan cover 22. The inverter element 16 has dust prevention and rain / snow water countermeasures. The other configuration is the same as that of the first embodiment.

  In the vehicle drive device of the present embodiment configured as described above, the cooling air blown from the cooling fan 12 flows through the outer periphery of the electric motor main body 21 by the fan cover 22 to cool the electric motor main body 21. Since the vehicle traveling wind directly hits the inverter element 16, the cooling action is improved. Further, the heat generated in the inverter element 16 is conducted to the fan cover 22, and this heat is cooled by the cooling air. Other operations are the same as those in the first embodiment.

  Thus, according to the present embodiment, since the vehicle traveling wind directly hits the inverter element 16, it can be efficiently cooled. Since the fan cover 22 is also cooled, the cooling effect of the inverter element 16 is improved by heat conduction.

(Third embodiment)
FIGS. 6A and 6B are longitudinal sectional views showing the configuration of the vehicle drive device according to the third embodiment of the present invention. FIGS. 7A and 7B are FIGS. It is sectional drawing which follows the VIIa-VIIa line | wire or VIIb-VIIb line | wire of (b). In each figure, the same elements as those in FIGS. 1 to 5 are denoted by the same reference numerals, and the description thereof is omitted. As shown in the figure, the vehicle drive device of the present embodiment has a configuration in which a plurality of heat radiation fins 14 are provided radially on the end surface of the fan cover 22 and in the axial direction on the peripheral surface. Other configurations are the same as those of the second embodiment.

  In the vehicle drive device of the present embodiment, by providing the heat dissipation fins 14 in the fan cover 22, the heat dissipation area as a radiator is increased, and the cooling performance of the inverter element 16 can be improved.

(Fourth embodiment)
8A and 8B are axial sectional views showing the configuration of the vehicle drive device according to the fourth embodiment of the present invention. In the figure, the same elements as those in FIG.

  In this embodiment, the attachment member that elastically supports the fan cover 22 to the electric motor main body 21 is a wire rope attachment member 18. As shown in FIG. 9, the attachment member 18 includes a wire rope 19 wound in a spiral shape and a connection beam 20 for fixing the wire rope 19. When the wire rope 19 is a metal wire, insulation is applied to prevent an electrical short circuit.

  In general, a structure in which the elastic support is supported by a spring or an anti-vibration rubber is adopted. By making the attachment member 18 a wire rope type, a vibration damping action by friction between the strands of the wire rope can be obtained. Further, the durability is improved as compared with the vibration-proof rubber. Furthermore, vibration can be prevented against vibrations of a high frequency of 1000 Hz or more that are generated by rotation of the electric motor. Due to the above action, according to the present embodiment, high-frequency vibration resistance and durability of the inverter element 16 can be obtained.

(Fifth embodiment)
FIG. 10 is an axial sectional view showing a configuration of a vehicle drive device according to the fifth embodiment of the present invention. As shown in the figure, the attachment of the control device 23 to the electric motor main body 21 is made 45 degrees oblique by the wire rope type attachment member 18.

  In the vehicle drive device of the present embodiment configured as described above, the friction between the strands of the wire rope 19, the circular deflection of the wire rope 19, and the deflection in the left-right direction have vibration-proofing effects. Therefore, the control device 23 is effectively prevented from vibration.

1 is a longitudinal sectional view of a vehicle drive device according to a first embodiment of the present invention. Sectional drawing which follows the II-II line | wire of FIG. The attachment state to the trolley | bogie frame of the vehicle drive device of the 1st Embodiment of this invention is shown, (a) is center part sectional drawing, (b) is edge part sectional drawing. The longitudinal cross-sectional view of the vehicle drive device of the 2nd Embodiment of this invention. Sectional drawing which follows the VV line | wire of FIG. The longitudinal cross-sectional view of the vehicle drive device of the 3rd Embodiment of this invention. Sectional drawing which follows the VIIa-VIIa line | wire or VIIb-VIIb line | wire of FIG. Sectional drawing of the drive device for vehicles of the 4th Embodiment of this invention. The perspective view which shows the attachment member with which the vehicle drive device of the 4th Embodiment of this invention is equipped. Sectional drawing which shows the attachment state to the trolley | bogie frame of the vehicle drive device of the 5th Embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Rotary shaft, 2 ... Bearing, 3 ... Housing, 4 ... Rotor core, 5 ... Rotor duct, 6 ... Rotor core presser, 7 ... Stator coil, 8 ... Stator iron core, 10 ... Stator frame, 11 ... Mounting member, 12 ... Cooling fan, 13 ... fan air inlet, 14 ... radiation fin, 15a, 15b ... handle, 16 ... inverter element, 17 ... elastic support, 18 ... wire rope type mounting member, 19 ... wire rope, 20 ... connection beam, DESCRIPTION OF SYMBOLS 21 ... Electric motor main body, 22 ... Fan cover, 23 ... Control apparatus, 25 ... Bogie frame, 26 ... Axle, 27 ... Wheel, 28 ... Rail

Claims (12)

  Cooling at one end of the rotating shaft carrying the rotor core supported by the bearing provided at the end of the cylindrical stator frame with the stator core attached to the inner periphery and projecting from the stator frame that rotates on the inner periphery of the stator core An electric motor main body to which a fan is attached, a fan cover that covers the cooling fan by an elastic attachment member and is attached to the stator frame and guides cooling air to the outer periphery of the stator frame, and a plurality of attachments attached to the fan cover A vehicle drive device comprising: an inverter element; and a control device attached to the stator frame via an elastic support.   2. The vehicle drive device according to claim 1, wherein the plurality of inverter elements are distributed and arranged substantially equally in the circumferential direction of the fan cover when the electric motor body is viewed from the axial direction.   The plurality of inverter elements are distributed and arranged in a circumferential direction of the fan cover when the motor main body is viewed from the axial direction, avoiding a mounting position of the fan cover to the motor main body. Item 2. The vehicle drive device according to Item 1.   The plurality of inverter elements are distributed and arranged in a circumferential direction of the fan cover as seen from the axial direction of the electric motor main body, avoiding a handle and the control device for mounting on a bogie frame. Item 2. The vehicle drive device according to Item 1.   5. The vehicle drive device according to claim 1, wherein the plurality of inverter elements are attached to an inner peripheral surface of the fan cover.   The vehicle drive device according to claim 1, wherein the plurality of inverter elements are attached to an outer peripheral surface of the fan cover.   The vehicle drive device according to claim 1, wherein the fan cover is provided with a radiation fin.   The vehicle drive device according to claim 1, wherein the attachment member and the elastic support are of a wire rope type.   The vehicle drive device according to claim 1, wherein the attachment member and the elastic support are of a metal wire rope type.   The vehicle drive device according to claim 9, wherein the controller and the fan cover are attached to the stator frame via an insulator.   The vehicle drive device according to claim 1, wherein the attachment member and the elastic support are of a non-metallic wire rope type.   The vehicle drive device according to any one of claims 9 to 11, wherein the elastic support of the attachment of the control device and the attachment of the fan cover to the stator frame has an angle of substantially 45 degrees.

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