JP2006014452A - Driving device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a heat from a motor hard to transfer to an inverter circuit through a power line to contain the motor and the inverter circuit in one housing. <P>SOLUTION: A cooling fin 37 is arranged, for example, at the outside between the power lines 36 for AC three-phases, and the heat of the power line 36 is emitted outside from this cooling fin 37. More particularly, the connector of an inverter power line member 29 and a motor power line member 30 is covered by a lid member 8, and in the state that the lid member 8 is removed, the connecting work of the power line member is performed. The cooling fin 37 is projected in the rear surface of the lid member 8. After the power line connecting work is ended, when the opening of the housing 3 is covered with the lid member 8 and the lid member 8 is mounted in the housing 3, the cooling fins 37 are arranged between the power lines 36 and at the outside. It is as good also for the front surface of the lid member 8 as provided in the cooling fin 41. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a drive device used as a drive source of a vehicle, and in particular, an inverter circuit that controls and outputs power from a power supply and an electric motor that is rotationally driven by power supplied from the inverter circuit via a power line are the same. It is suitable for being housed in the housing.

In a drive device having an inverter circuit that controls and outputs drive power supplied to a motor, that is, a motor from a power source, for example, for the purpose of downsizing a power line connecting the inverter circuit and the motor, the motor and the inverter circuit are the same. There are some which are housed in a housing (see, for example, Patent Document 1).
JP 2003-274599 A

  However, in the conventional drive device, since the inverter circuit and the electric motor can be arranged close to each other, there is a merit that the power line can be shortened by that amount, but conversely, the heat of the electric motor is transferred to the inverter circuit via the short power line. There is also a demerit that it is easy to transmit to. For example, since the heat capacity of the entire motor is larger than that of the inverter circuit, after the inverter circuit is stopped, the heat stored in the motor is radiated to the inverter case via the inverter circuit. Exposed to high temperatures. In addition, when the inverter circuit is operated again in such a state, so-called motor output limitation is performed, which limits the amount of energization in the inverter circuit in order to protect the switching elements in the circuit from temperature destruction. In addition, an increase in temperature change may induce thermal fatigue of the solder in the inverter circuit, which may affect the life of the switching element.

  The present invention has been developed to solve the above-described problems, and provides a drive device in which heat from an electric motor is difficult to be transmitted to an inverter circuit when the inverter circuit and the electric motor are housed in a single casing. It is the purpose.

  In order to achieve the above object, a drive device according to the present invention includes an inverter circuit for controlling and outputting electric power supplied from a power supply, and an electric motor that is rotationally driven by electric power supplied from the inverter circuit via a power line. In the same housing, and is provided with a cooling means for cooling the power line. Specifically, a protrusion is provided so as to project from the housing toward the power line.

  Thus, according to the drive device of the present invention, when the inverter circuit and the electric motor are housed in the same casing, the power line connecting the inverter circuit and the electric motor is cooled by the cooling means. Heat from the motor is difficult to transfer. Further, by using the protruding portion protruding from the housing toward the power line as the cooling means, the configuration is simple and easy to put into practical use.

Next, a first embodiment of the drive device of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram showing details of the drive device of the present embodiment, in which FIG. 1a is a longitudinal sectional view, FIG. 1b is a plan view of a lid member, and FIG. 1c is a side view of FIG. In this embodiment, a motor (electric motor) 1 and an inverter circuit 2 that controls and outputs electric power supplied thereto are housed in a single housing. The housing 3 is roughly divided into a motor case 4 that houses the motor 1 and an inverter case 5 that houses the inverter circuit 2. Each of these cases is a bottomed rectangular cylinder, and the motor case 4 is deep and the inverter case 5 is shallow. The bottom plate 6 of the motor case 4 is made of an individual flat plate that can be freely attached and detached, and an intermediate wall 7 is provided at the opening end on the opposite side. A removable cover member 8 is attached to the side surface of the opening end of the motor case 4. A plurality of heat radiation fins 10 are provided upright on the case outer surface of the bottom plate 9 of the inverter case 5.

  When assembling this drive device, for example, the stator 12 is disposed from the inner side surface of the motor case 4, the rotor 13 is disposed inside thereof, and the two bearings 15 provided on the bottom plate 6 and the intermediate wall 7 are used. The rotor shaft 14 is rotatably supported. On the other hand, a gear 16 for detecting the rotational position of the rotor 13, a slip ring 17 and the like are attached to the outer side of the intermediate wall 7 of the rotor shaft 14, and a slip ring cover 18 is further attached to the outside thereof. A rotor rotation sensor 19 is also attached to the intermediate wall 7 so as to face the teeth of the gear 16. A sealing material 20 is interposed between the bottom plate 6 and the motor case 4 body, and both are fixed with bolts 21 and nuts 22.

  On the other hand, the power module 24 is mounted on the bottom plate 9 provided with the heat radiation fins 10 of the inverter case 5 via the heat transfer grease 23, the control board 25 is mounted thereon, and the power module 24 is mounted on the housing. Connect to the terminal 26 outside the body 3. Further, a smoothing capacitor 27 for absorbing power fluctuation is attached between the terminal 26 and the power module 24. The inverter circuit 3 is configured by the power module 24, the control board 25, the smoothing capacitor 27, and the like.

  A hole 28 is formed in the intermediate wall 7 in the inner portion of the housing 3 of the lid member 8. An inverter power line member 29 projects from the power module 24 of the inverter circuit 2 so as to penetrate the hole 28 of the intermediate wall 7 when the inverter case 5 and the motor case 4 are combined. . In addition, a motor power line member 30 projects from the stator 12 of the motor 1 toward the hole 28 in the intermediate wall 7 of the motor case 4. Each of these power line members is formed of a thin flat plate member, and three power line members are provided for the U phase, the V phase, and the W phase corresponding to three-phase alternating current.

  And when the sealing material 31 is interposed between the inverter case 5 and the motor case 4 and both are fixed with the bolt 32 and the nut 33, the end portions of the corresponding inverter power line member 29 and motor power line member 30 are It overlaps in the vicinity of the hole portion 28 of the intermediate wall 7. At this time, the two cases 4 and 5 are superposed and the casing 3 is substantially sealed. However, since the lid member 8 is in the vicinity of the hole portion 28 of the intermediate wall 7, the lid member 8 is removed. In this state, the end overlapping portions of the inverter power line member 29 and the motor power line member 30 are fixed and connected with bolts 34 and nuts 35.

  On the other hand, four cooling fins 37 project from the rear surface of the lid member 8, that is, the inner surface of the housing. In the state where the inverter power line member 29 and the motor power line member 30 are connected and the three (three) power lines 36 are constructed as described above, the sealing material 38 is provided between the lid member 8 and the housing 3. The cover member 8 is interposed and the opening of the housing 3 is covered, and the nut 40 is screwed onto the embedded bolt 39 and tightened to fix them. Then, the four cooling fins 37 projecting from the inner surface of the casing of the lid member 8 are positioned between and outside the three power lines 36, respectively. It is desirable that the gap between the cooling fin 37 and the power line 36 be a closest distance that can secure an insulation distance.

The heat of the motor 1 tends to be transmitted to the inverter circuit 2 via the power line 36, but since the cooling fin 37 is provided in the vicinity of the power line 36, the heat is transmitted to the cooling fin 37 from which the lid is covered. As a result, the temperature of the power line 36 is lowered and the heating of the inverter circuit 2 can be suppressed and prevented.
Thus, according to the drive device of the present embodiment, the heat of the motor 1 is not easily transmitted to the inverter circuit 2 by providing the cooling means for cooling the power line 36. Of course, by storing the motor 1 and the inverter circuit 2 in one housing 3, the length of the power line 36 can be shortened and the size can be reduced.

Further, as a power line cooling means, a cooling fin (protrusion) 37 that protrudes from the housing 3 toward the power line 36 inside the housing and absorbs and cools the heat of the power line 36 is provided. The heat of 36 can be efficiently absorbed and cooled, and the configuration is easy and practical.
In addition, a plurality of power lines 36 are provided in the housing 3 at a predetermined interval, and the cooling fins (projections) 37 are provided so as to protrude between the plurality of power lines 36. The heat can be absorbed more efficiently and cooled.

  Further, the inverter power line member 29 derived from the inverter circuit 2 and the motor power line member 30 derived from the motor 1 are connected to form a power line 36, and the casing 1 includes the inverter power line member 29 and The lid member 8 that covers the connection portion with the motor power line member 30 is provided, and the cooling fins (projections) 37 project from the inside surface of the casing of the lid member 8 toward the inside of the casing. In this state, the inverter power line member 29 and the motor power line member 30 can be connected. After the connection, the cover member 8 covers the opening of the housing 3, and cooling fins (projections) 37 are provided in the vicinity of the power line 36. It can be arranged, and the working efficiency and the power line cooling effect are excellent.

  Next, a second embodiment of the drive device of the present invention will be described with reference to FIG. 2A and 2B are configuration diagrams showing details of the drive device of the present embodiment, in which FIG. 2a is a longitudinal sectional view, FIG. 2b is a plan view of a lid member, and FIG. 2c is a side view of FIG. The configuration of the drive device of this embodiment is substantially the same as that of FIG. 1 of the first embodiment, and the configuration of the lid member is different. Specifically, in the first embodiment, the cooling fins (projections) 37 are formed only on the back side of the lid member 8, that is, on the inner surface of the casing. However, in this embodiment, the front side of the lid member 8, that is, the casing. A plurality of cooling fins 41 project from the external surface of the body. Since this type of cooling fin 41 has the effect of increasing the contact area with the outside (outside air) and improving the heat exchange efficiency, as described above, the lid member via the cooling fin 37 inside the housing 3 from the power line 36. The heat transferred to 8 is radiated to the outside (outside air) via the cooling fins 41 outside the housing, and the cooling effect of the power line 36 is enhanced.

  Note that the cooling fins inside and outside the housing are not limited to the above-described forms, and may be, for example, tapered, cylindrical, quadrangular, or conical protrusions.

It is a block diagram which shows 1st Embodiment of the drive device of this invention, (a) is a longitudinal cross-sectional view, (b) is a top view of a cover member, (c) is a side view of the same figure b. It is a block diagram which shows 2nd Embodiment of the drive device of this invention, (a) is a longitudinal cross-sectional view, (b) is a top view of a cover member, (c) is a side view of the same figure b.

Explanation of symbols

1 is a motor.
2 is an inverter circuit 3 is a housing 4 is a motor case 5 is an inverter case 7 is an intermediate wall 8 is a lid member 28 is a hole 29 is an inverter power line member 30 is a motor power line member 36 is a power line 37 is a cooling fin 41 is a cooling fin

Claims (5)

  An inverter circuit for controlling and outputting electric power supplied from a power source and an electric motor that is driven to rotate by electric power supplied from the inverter circuit via a power line, are housed in the same housing, A driving device comprising cooling means for cooling the power line.   2. The driving device according to claim 1, wherein the cooling unit includes a projecting portion that protrudes from the housing toward a power line inside the housing and that absorbs and cools the heat of the power line.   The drive device according to claim 2, wherein a plurality of the power lines are provided in the housing at a predetermined interval, and the protruding portions are provided so as to protrude between the plurality of power lines.   The power line is formed by connecting an inverter-side power line portion derived from an inverter circuit and a motor-side power line portion derived from an electric motor, and the casing includes an inverter-side power line portion and a motor-side power line portion. 4. The driving device according to claim 2, wherein a lid member that covers the connecting portion is provided, and the protruding portion projects from the inner surface of the lid member toward the inside of the housing.   5. The driving device according to claim 2, wherein a heat radiating fin is provided on an outer surface of a portion of the casing where the protruding portion is formed. 6.

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