JP2014143841A - Inverter integrated motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inverter integrated motor which achieves excellent heat radiation performance without enlarging the motor.SOLUTION: An inverter integrated motor 1 is formed by integrating a motor housing 41 storing a rotor 23 and a stator 22 and having a first heat radiation part 413 with an inverter housing 42 storing a power module 31 of an inverter 3 and having a second heat radiation part 421. The power module 31 is disposed contacting with the motor housing 41 and the inverter housing 42.

Description

  The present invention relates to an inverter-integrated motor.

  In the heat removal structure of an inverter-integrated AC motor, a hollow cylindrical cooling block that forcibly cools by placing a metal plate for element cooling in the form of a ring plate between the motor that is a heating element and the power module therebetween. An arrangement is known (Patent Document 1).

JP 2007-116840 A

  However, since the conventional inverter-integrated motor is configured to dissipate heat by the cooling block provided between the motor and the inverter that are the heating elements, if the motor and the inverter generate a large amount of heat, the cooling block alone There is a problem that heat cannot be sufficiently radiated and the cooler and the motor become large.

  The problem to be solved by the present invention is to provide an inverter-integrated motor excellent in heat dissipation without enlarging the motor.

  This invention solves the said subject by making a power module contact both the motor housing | casing which has a 1st thermal radiation part, and the inverter housing | casing which has a 2nd thermal radiation part.

  According to the present invention, heat from the power module, which is the main heating element of the inverter, is transmitted from the motor housing to the first heat radiating portion and simultaneously from the inverter housing to the second heat radiating portion. Improves.

It is sectional drawing which shows the inverter integrated motor which concerns on one embodiment of this invention. It is sectional drawing which follows the II-II line | wire of FIG. It is sectional drawing which shows the inverter integrated motor which concerns on other embodiment of this invention. It is sectional drawing which follows the IV-IV line of FIG. It is sectional drawing which shows the inverter integrated motor which concerns on other embodiment of this invention. It is sectional drawing which follows the VI-VI line of FIG.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<< First Embodiment >>
1 and 2 are views showing an inverter-integrated motor according to a first embodiment of the present invention. The inverter-integrated motor 1 of this example is an electromechanical integrated device in which a motor 2 and an inverter 3 are integrated, and includes a rotating shaft 21, a stator 22, a rotor 23, and components of the inverter 3 that are components of the motor 2. A power module 31, a DC bus bar 32, a smoothing capacitor 33, and a circuit board 34 are built in the housing 4. The inverter integrated motor 1 of this example is intended to include an inverter integrated motor generator that also has a power generation function by regeneration.

  The housing 4 of this example includes a motor housing 41 and an inverter housing 42, and the motor housing 41 and the inverter housing 42 are juxtaposed in the direction of the rotating shaft 21 of the motor 1, and bolts, screws, adhesives It is connected by fastening means such as. In this way, the motor casing 41 and the inverter casing 42 constituting the casing 4 are configured as separate members and coupled by fastening means is also referred to as integration. It is also referred to as integration that the motor casing 41 and the inverter casing 42 are constituted by a single casing member.

  The motor housing 41 has a bottomed cylindrical main body 411 with one end face in the axial direction open, and closes one end face of the bottomed cylindrical main body 411 so as to rotatably support the rotary shaft 21 and the rotary shaft. 21 has a first bracket portion 412 through which the cylindrical body 411 and the first bracket portion 412 are fixed by fastening means (not shown) such as welding, caulking, and bolts. A plurality of heat radiation fins 413 are formed on the outer surface of the cylindrical main body 411 so as to dissipate heat from the power module 31 transmitted to the motor housing 41 to the outside.

  The second bracket portion 416 and the third bracket portion 417 constituting the other end surface of the bottomed cylindrical main body 411 are provided with a motor for preventing dust in the motor housing 41 from entering the inverter housing 42 side. It is provided between the chamber 414 and the inverter chamber 422. The motor casing 41 and the inverter casing 42 are integrally fastened at the second bracket portion 416 and the third bracket portion 417. Note that the second bracket portion 416 may be configured as a separate member from the main body 411 of the motor housing 41.

  At the center of the motor chamber 414 in the axial direction, the rotating shaft 21 is supported by bearings 415 and 415 so as to be rotatable in both directions, and the upper end of the rotating shaft 21 extends from the motor housing 41 to the outside, where a load is applied. Connected. Examples of the load connected to the motor 2 of this example include a drive shaft of an electric vehicle, and the motor 2 is driven to power and output to the drive shaft, or the rotation of the drive shaft of the electric vehicle is used as an input for regenerative drive. Can be.

  The inverter housing 42 is formed of a circular flat plate-like main body, and a plurality of heat radiation fins 421 are provided on the outer surface of the inverter housing 42 so as to dissipate heat from the power module 31 transmitted to the inverter housing 42 to the outside. . Other configurations of the inverter housing 42 will be described later.

  A motor chamber 414 is formed inside the motor casing 41, and a space between the inverter casing 42, in this example, the circular flat plate-shaped inverter casing 42 and the second bracket portion 416 and the third bracket portion 417. Is formed with an inverter chamber 422.

  In the motor chamber 414, the stator 22 is fixed to the inner peripheral surface of the bottomed cylindrical main body 411, and the rotor 21 is fixed to the rotating shaft 21 so as to face the inside of the stator 22 through a gap.

  The stator 22 is a stationary member that generates a rotating magnetic field, and includes a stator core that forms a magnetic circuit, and a stator coil that is wound around the stator core and that is supplied with AC power from the inverter 3 to generate a rotating magnetic field. The stator core is, for example, a cylindrical magnetic body formed by stacking a plurality of silicon steel plates in the axial direction. The stator core is press-fitted into the inner peripheral surface of the bottomed cylindrical main body 411 and is applied to the inner peripheral surface of the bottomed cylindrical main body 411. The outer peripheral surface is fixed by being fitted. The stator coil is electrically connected to a coil conductor wound around a stator core to form a three-phase (u-phase, v-phase, w-phase) coil, and the three-phase coil is star-connected ( (Y-connection). The star connection is a system in which one end of each phase coil is electrically connected so that a neutral point is formed.

  A lead conductor 24 is electrically connected to the end of each phase coil of the stator coil (end opposite to the end on the neutral point side). Each lead conductor 24 is a flat plate-like long conductor that also serves as an input terminal of the motor 2, and is an axial end on the second bracket portion 416 side of the stator 22, specifically, a second end of a coil end portion of the stator coil. It is led out in the axial direction from the bracket portion 416 side, extends from the motor chamber 414 to the inverter chamber 422 through the through-hole 418 formed in the second bracket portion 416, and corresponds to the terminal 35 of the corresponding phase of the inverter 3. Are electrically connected.

  Thereby, the same phase of the terminal 35 of the inverter 3 and the phase coil of the stator coil of the motor 2 are electrically connected, and when the inverter integrated motor 1 of this example functions as a motor, the terminal of the inverter 3 The AC power running power of each phase output from 35 is guided to the corresponding phase coil of the stator coil via the corresponding phase lead conductor 24. When the inverter-integrated motor 1 of this example functions as a generator, the AC regenerative power of each phase output from the stator coil is supplied to the corresponding phase of the inverter 3 via the corresponding phase lead conductor 24. To the terminal 35.

  The rotor 23 is a part that rotates by a magnetic action with the stator 22. For example, a plurality of permanent magnets are embedded in a cylindrical magnetic body formed by stacking a plurality of silicon steel plates in the direction of the rotation shaft 21. Or a plurality of permanent magnets arranged on the outer peripheral surface of the magnetic body. In this case, the plurality of permanent magnets having different polarities are alternately arranged at equal intervals in the circumferential direction.

  In addition to the permanent magnet described above as the rotor 23, a rotor core that forms a magnetic circuit, and a field current that is wound around the rotor core and supplied from the outside such as an in-vehicle battery, includes a brush and a slip ring. A tandem-type Lundel structure rotor including a rotor coil that generates a magnetic flux for magnetizing the claw-shaped magnetic poles of the rotor core and a permanent magnet provided between the claw-shaped magnetic poles having different polarities of the rotor core. You can also.

  In the inverter chamber 422, the power module 31 is fixed to the inner surface of the inverter housing 42, and the smoothing capacitor 33 and the circuit board 34 are fixed via the bus bar 32. Details of this configuration will be described later. The terminal 35 is provided corresponding to three arms (three phases) constituted by switching semiconductor elements (IGBT or the like) of the power module 31, and one end side is provided inside the power module 31 with the two corresponding arms. It is electrically connected to the connection point of the switching semiconductor element. The other end side of the terminal 35 is led out from the power module 31 so as to extend in parallel along the inner surface of the inverter housing 42.

  Next, the arrangement configuration inside the inverter chamber 422 will be described.

  As shown in FIGS. 1 and 2, the eight power modules 31 are arranged on the outer periphery of the inverter chamber 422, one end surface of which is in contact with the inner surface of the inverter housing 42, and the other end surface thereof is the second of the motor housing 41. It arrange | positions so that the outer surface of the bracket part 416 may be contacted. As described above, by disposing the power module 31 on the outer periphery of the inverter chamber 422, the distance between the power module 31 that is a heating element and the radiation fins 413 of the motor housing 41 is shortened, so that the thermal resistance is reduced and the heat dissipation performance is reduced. Will improve. Further, both end surfaces of the power module 31 are brought into contact with the inverter housing 42 and the second bracket portion 416 of the motor housing 41, respectively, so that heat from the power module 31 is radiated from both of the two radiation fins 413 and 421. Heat dissipation is improved.

  On the other hand, the bus bar 32, the smoothing capacitor 33, and the circuit board 34 are arranged on the inner peripheral portion of the inverter chamber 422. That is, the circuit board 43 is disposed on the inner surface side of the inverter housing 42, and the eight smoothing capacitors 33 are disposed on the motor 2 side so as to surround the rotating shaft 21 via the bus bar 32. The portion including the inverter chamber 422 is resin-molded M1 so as to cover the power module 31, the bus bar 32, the smoothing capacitor 33, and the circuit board 34, and the inverter housing 42 is attached to the motor housing by the adhesive force of the resin mold M1. It will be fixed to the body 41.

  The following two processes can be adopted as the assembly order when manufacturing the inverter-integrated motor 1 of this example. In the first method, after fixing the power module 31, the bus bar 32, the smoothing capacitor 33, and the circuit board 34 to the inverter casing 42, the inverter casing 42 is fixed to the motor casing 41. This is a method of applying the resin mold M1. In the second method, the power module 31, the bus bar 32, the smoothing capacitor 33 and the circuit board 34 are fixed to the motor casing 41, and then the inverter casing 42 is fixed to the motor casing 41. This is a method of applying a resin mold M1 to the substrate.

As described above, according to the inverter-integrated motor 1 of the present example, the following operational effects can be obtained.
(1) In the inverter-integrated motor 1 of this example, since both end surfaces of the power module 31 that is a heating element are brought into contact with the inverter housing 42 and the second bracket portion 416 of the motor housing 41, the power module The heat from 31 can be radiated from both of the two radiating fins 413 and 421, and as a result, the heat dissipation is improved.

  (2) In the inverter-integrated motor 1 of the present example, the power module 31 that is a heating element is disposed on the outer periphery of the inverter housing 42, so that the heat dissipating fins 413 between the power module 31 and the motor housing 41 are provided. And the thermal resistance is reduced, which also improves the heat dissipation.

  (3) Further, in the inverter-integrated motor 1 of the present example, the second bracket portion 416 of the motor housing 41 and the inner surface of the inverter housing 42 are formed so as to face each other, and the power that is a heating element therebetween Since the module 31 is disposed, the contact area between the both end faces of the power module 31 and the inner surface of the second bracket portion 416 of the motor casing 41 and the inverter casing 42 is increased, the thermal resistance is reduced, and the heat dissipation is improved. improves.

  (4) Further, in the inverter-integrated motor 1 of this example, the first conductor 24 that is the input portion or the output portion of the motor winding of the stator 22 accommodated in the motor housing 41 is connected to the first conductor 24 of the motor housing 41. 2 It pulls out to the inverter housing 42 side through the through-hole 418 formed in the bracket portion 416 and is connected to the second conductor 35 which is the output portion or the input portion of the power module 31 in the inverter chamber 422. It can be expected that the casing 4 is effectively reduced in size and the connection workability is improved.

  (5) In the inverter-integrated motor 1 of this example, the inverter 3 is fixed with the resin casing at the same time as the inverter 3 is resin-molded. The fastening part with 41 can be omitted, and the housing 4 can be miniaturized. Further, no separate fastening work is required, and the heat dissipation of the connection part is improved.

  (6) In the inverter-integrated motor 1 of this example, since the motor chamber 414 and the inverter chamber 422 are partitioned by the second bracket portion 416, high-temperature air convection flowing from the motor chamber 414 to the inverter chamber 424 is generated. Can be suppressed.

  (7) In the inverter-integrated motor 1 of the present example, the inverter casing 42 is fixed after the power module 31, the bus bar 32, the smoothing capacitor 33, and the circuit board 34 are fixed to the inverter casing 42. In the first method of fixing 42 to the motor casing 41 or after fixing the power module 31, bus bar 32, smoothing capacitor 33 and circuit board 34 to the motor casing 41, On the other hand, any method can be adopted in the second method of fixing the inverter housing 42, and the degree of freedom in the assembly process is increased. In particular, according to the first method, an assembly work space between the bus bar 32 and the circuit board 34 is increased and workability is improved, whereas according to the second method, connection workability of the AC circuit is improved. There are advantages.

<< Second Embodiment >>
3 and 4 are views showing an inverter-integrated motor 1 according to a second embodiment of the present invention. The same reference numerals are given to the members and the like that are the same as those in the first embodiment described above, and the description thereof will be given here. Incorporated into.

  In the first embodiment described above, the rotating shaft 21 of the motor 2 is supported by the first bracket portion 412 and the second bracket portion 416 of the motor housing 41. However, in this example, the rotating shaft 21 of the motor 2 is supported by the motor housing. It is supported by the first bracket portion 412 of 41 and the inverter housing 42. For this reason, the rotating shaft 21 passes through the central portion of the inverter chamber 422, and a through hole is formed in the central portion of the circuit board 34 accordingly.

  In addition to the resin mold M1 that seals the inverter 3 and fixes the inverter housing 42 to the motor housing 41, a resin mold M2 that covers the stator 22 of the motor 2 is also formed at the same time.

  Further, when the inverter casing 42 is fixed to the motor casing 41, positioning pins 43 for securing the alignment between the two are between the power modules 31 (see FIG. 4), and the inverter casing 42 and the motor It is provided between the second bracket part 416 of the housing 41.

  As described above, the inverter-integrated motor 1 of this example has the following operational effects in addition to the operational effects of the first embodiment described above. That is, according to the inverter-integrated motor 1 of this example, in addition to the resin mold M1 that seals the inverter 3 and fixes the inverter housing 42 to the motor housing 41, the resin mold that covers the stator 22 of the motor 2 Since M2 is also molded at the same time, the heat dissipation of the connection portion is improved and the resin molding process can be shortened. Moreover, since the positioning pin 43 is provided between the inverter housing | casing 42 and the motor housing | casing 41, the alignment precision at the time of fixing both is improved.

<< Third Embodiment >>
5 and 6 are views showing an inverter-integrated motor 1 according to a third embodiment of the present invention, and members and the like common to the above-described first and second embodiments are denoted by the same reference numerals. The description is incorporated herein.

  The casing 4 of the inverter-integrated motor 1 of this example includes a motor casing 41 and an inverter casing 42. The motor casing 41 includes a cylindrical main body 411, a first bracket portion 412 and a second bracket portion 416. Have Moreover, the inverter housing | casing 42 has a circular flat plate-shaped main body, and the connection part 424 fitted to the one end edge of the cylindrical main body 411 of the motor housing | casing 41 is discretely formed in the outer periphery. The connecting portion 424 is fitted to one end edge of the cylindrical main body 411 of the motor casing 41, and the resin casing M1 is applied similarly to the first and second embodiments, so that the inverter casing 42 becomes the motor casing. It is fixed to the body 41.

  On the inner surface of the inverter housing 42, an annular partition 423 is formed that partitions the power module 31 disposed on the outer periphery, the bus bar 32, the smoothing capacitor 33, and the circuit board 34 disposed on the inner periphery. . The second bracket part 416 of the motor housing 41 is joined to the tip of the annular partition part 423. The annular partition wall portion 423 is formed with through holes at a predetermined interval along the circumferential direction so that the wiring between the power module 31, the bus bar 32, and the circuit board 35 can pass therethrough.

  As described above, the inverter integrated motor 1 of the present example has the following operational effects in addition to the operational effects of the first and second embodiments described above. That is, according to the inverter-integrated motor 1 of the present example, on the inner surface of the inverter housing 42, the power module 31 disposed on the outer peripheral portion, the bus bar 32 disposed on the inner peripheral portion, the smoothing capacitor 33, and the circuit. Since the annular partition 423 that partitions the substrate 34 is formed, it is possible to suppress the heat generated in the power module 31 from being transmitted to the smoothing capacitor 33 and the circuit substrate 34. The annular partition wall 423 may be formed on the motor housing 41 side.

  The radiating fin 413 corresponds to a first radiating portion according to the present invention, and the radiating fin 421 corresponds to a second radiating portion according to the present invention.

DESCRIPTION OF SYMBOLS 1 ... Inverter integrated motor 2 ... Motor 21 ... Rotating shaft 22 ... Stator 23 ... Rotor 24 ... Leader conductor 3 ... Inverter 31 ... Power module 32 ... DC bus bar 33 ... Smoothing capacitor 34 ... Circuit board 35 ... Terminal 4 ... Housing DESCRIPTION OF SYMBOLS 41 ... Motor housing | casing 411 ... Bottomed cylindrical main body, cylindrical main body 412 ... 1st bracket part 413 ... Radiation fin 414 ... Motor chamber 415 ... Bearing 416 ... 2nd bracket part 417 ... 3rd bracket part 418 ... Through-hole 42 ... Inverter housing 421 ... Heat radiation fins 422 ... Inverter chamber 423 ... Annular partition 424 ... Connecting part 43 ... Positioning pins M1, M2 ... Resin mold

Claims (10)

In the inverter-integrated motor in which the rotor and the stator are housed and the motor housing having the first heat radiating portion and the inverter power module are housed and the inverter housing having the second heat radiating portion are integrated,
The power module is an inverter-integrated motor arranged in contact with the motor casing and the inverter casing.   2. The inverter-integrated motor according to claim 1, wherein the power module is disposed on an outer peripheral portion of the inverter housing, and inverter components other than the power module are disposed on an inner peripheral portion of the inverter housing. The motor casing and the inverter casing have end faces facing each other,
The inverter integrated motor according to claim 1, wherein one end surface and the other end surface of the power module are disposed in contact with the end surface of the motor casing and the inverter casing.   A first conductor that is an input part or an output part of a motor winding of the stator housed in the motor casing is drawn into the inverter casing through a through hole formed in the motor casing, and the inverter 4. The inverter-integrated motor according to claim 3, wherein the inverter-integrated motor is connected to a second conductor that is an output portion or an input portion of the power module in the housing.   The inverter-integrated motor according to any one of claims 1 to 4, wherein the inverter is resin-molded, and the inverter housing is fixed to the motor housing by the resin molding. The motor casing includes a bracket that partitions the interior of the inverter casing.
One end of the motor rotation shaft is supported by the bracket,
The inverter integrated motor according to any one of claims 1 to 5, wherein one end surface of the power module is in contact with a main surface of the bracket.   The inverter-integrated motor according to any one of claims 1 to 6, wherein a partition wall that partitions the power module and an inverter component other than the power module is provided in the motor casing or the inverter casing. The rotor and stator are housed, and the motor housing having the first heat radiating portion is integrated with the inverter power module, smoothing capacitor, bus bar and circuit board, and the inverter housing having the second heat radiating portion is integrated. In the manufacturing method of the inverter integrated motor,
A first step of fixing the power module, the smoothing capacitor, the bus bar and the circuit board to the inverter casing;
After the first step, a second step of fixing the inverter case to which the power module, the smoothing capacitor, the bus bar, and the circuit board are fixed to the motor case, Production method. The rotor and stator are housed, and the motor housing having the first heat radiating portion is integrated with the inverter power module, smoothing capacitor, bus bar and circuit board, and the inverter housing having the second heat radiating portion is integrated. In the manufacturing method of the inverter integrated motor,
A first step of fixing the power module, the smoothing capacitor, the bus bar and the circuit board to the motor housing;
After the first step, a second step of fixing the motor case to which the power module, the smoothing capacitor, the bus bar, and the circuit board are fixed to the inverter case, Production method.   The method for manufacturing an inverter-integrated motor according to claim 8 or 9, wherein the inverter casing and the motor casing are fixed to each other by a resin mold of the inverter.

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