JP2014138489A - Motor with inverter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a motor with an inverter which easily connects a conductor of the motor with a conductor of the inverter without enlarging a housing.SOLUTION: A motor 1 with an inverter is formed by integrating a motor housing 41, which houses a rotor 23 and a stator 22, with an inverter housing 42 which houses a power module 31 of an inverter 3. A first conductor 24 serving as an input part or an output part of a motor coil is pulled out to the exterior of the motor housing, and a second conductor 35 serving as an output part or an input part of the power module is pulled out to the exterior of the inverter housing. The first conductor and the second conductor are connected at the exterior of the motor housing and the inverter housing.

Description

  The present invention relates to a motor with an inverter.

  The motor housing and the inverter housing are integrated, and then the conductors derived from the motor and the conductors derived from the inverter are bolted in the housing using openings formed in the inverter housing. What is connected by this is known (Patent Document 1).

JP 2008-2111945 A

  However, since the conventional motor with an inverter has a structure in which a tool is inserted through an opening formed in the casing of the inverter and a bolt is tightened in the casing, in order to improve the workability of the bolt tightening, There is a problem that the space needs to be increased to some extent, and as a result, the casing becomes larger.

  The problem to be solved by the present invention is to provide a motor with an inverter that can easily connect the conductors of the motor and the inverter without increasing the size of the housing.

  The present invention relates to a motor with an inverter in which a motor housing that houses a rotor and a stator and an inverter housing that houses an inverter power module are integrated, and a conductor serving as an input portion of a motor winding is connected to the motor housing. The above-mentioned problem is solved by pulling out the outside of the body, pulling out the conductor as the output part of the power module to the outside of the inverter casing, and connecting the two conductors outside each casing.

  According to the present invention, since the two conductors are connected to each other outside the case, the connection work can be easily performed without increasing the size of the case in order to improve the workability of connecting them. Can do.

It is sectional drawing which shows the motor with an inverter which concerns on one embodiment of this invention. It is sectional drawing which follows the 1B-1B line | wire of FIG. 1A. It is a perspective view which shows the II section of FIG. 1A. It is a perspective view which shows an example of the connection part of the extraction conductor of FIG. 1A, and a terminal. It is a perspective view which shows the other example of the connection part of the extraction conductor of FIG. 1A, and a terminal. It is sectional drawing which shows the motor with an inverter which concerns on other embodiment of this invention. It is a 4B arrow line view shown to FIG. 4A. It is a perspective view which shows the V section of FIG. 4A. It is sectional drawing which shows the motor with an inverter which concerns on other embodiment of this invention. It is sectional drawing which shows the motor with an inverter which concerns on other embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
<< First Embodiment >>
1A and 1B are diagrams showing a motor with an inverter according to a first embodiment of the present invention. The motor with an inverter 1 of this example is an electromechanical integrated device in which a motor 2 and an inverter 3 are integrated, and is 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. In addition, the motor 1 with an inverter of this example is a meaning including the motor generator with an inverter which also has the electric power generation function by regeneration.

  The housing 4 of this example includes a motor housing 41, an inverter housing 42, and a partition bracket 43. The motor housing 41, the partition bracket 43, and the inverter housing 42 are juxtaposed in the axial direction in this order, and a bolt These flange portions are coupled to each other by fastening means (not shown) such as screws and screws. 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. In addition, it is also called integration that the motor housing 41 and the inverter housing 42 are configured by one housing member as in the second embodiment described later.

  The motor housing 41 includes a cylindrical main body 411 having both axial end surfaces open, and a bracket 412 that closes one end surface of the cylindrical main body 411 to rotatably support the rotary shaft 21 and through which the rotary shaft 21 passes. The cylindrical main body 411 and the bracket 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 inverter housing 42 includes a cylindrical main body 421 whose both end surfaces in the axial direction are open, and a bracket 422 that closes one end surface of the cylindrical main body 422 and rotatably supports the rotary shaft 21. The main body 421 and the bracket 422 are fixed by fastening means (not shown) such as welding, caulking, and bolts. A plurality of heat radiating fins 423 are provided on the outer surface of the bracket 422 so as to radiate 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.

  The partition bracket 43 serves as the other bracket of the motor housing 41 and the other bracket of the inverter housing 42, and prevents dust in the motor housing 41 from entering the inverter housing 42. It is interposed between the cylindrical main body 411 of the motor casing 41 and the cylindrical main body 421 of the inverter casing 42. The motor casing 41 and the inverter casing 42 are integrally fastened at the partition bracket 43. The partition bracket 43 may be configured as a part of the cylindrical body 411 of the motor casing 41 or as a part of the cylindrical body 421 of the inverter casing 42.

  A motor chamber 414 is formed inside the motor casing 41, and an inverter chamber 424 is formed inside the inverter casing 42, and the motor chamber 414 and the inverter chamber 424 are axially centered by bearings 415 and 425. The rotating shaft 21 is supported so as to be rotatable in both directions. And the right end of the rotating shaft 21 extends outside from the motor housing | casing 41, and a load is connected here. 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.

  In the motor chamber 414, the stator 22 is fixed to the inner peripheral surface of the 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 a cylindrical magnetic body formed by, for example, stacking a plurality of silicon steel plates in the axial direction, press-fitted into the inner peripheral surface of the cylindrical main body 411, and the outer peripheral surface of the inner peripheral surface of the cylindrical main body 411. It is fixed by fitting. 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 side of the partition bracket 43 of the stator 22, specifically, on the side of the partition bracket 43 of the coil end portion of the stator coil. Is extended from the motor chamber 414 to the inverter chamber 424 through the through hole 431 of the partition bracket 43 and is electrically connected to the terminal 35 of the corresponding phase of the inverter 3. .

  Thereby, the same phase of the terminal 35 of the inverter 3 and the phase coil of the stator coil of the motor 2 is electrically connected, and when the motor 1 with an inverter of this example functions as a motor, the terminal 35 of the inverter 3 is used. The AC power running power of each phase output from is guided to the corresponding phase coil of the stator coil via the corresponding phase lead conductor 24. In addition, when the motor 1 with an inverter 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. Guided to terminal 35. Details of the connection structure between the lead conductor 24 of the stator 22 and the terminal 35 of the inverter 3 will be described later.

  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 424, the power module 31 is fixed to the inner peripheral surface of the bracket 422, and the smoothing capacitor 33 and the circuit board 34 are fixed via the bus bar 32. The power module 31 is provided on the inner peripheral surface of the bracket 422 in a state of high thermal conductivity, and includes a terminal 35 led out from the power module 31.

  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 inside the power module 31 and the two switching semiconductors of the corresponding arm. It is electrically connected to the connection point of the 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 cylindrical main body 421 of the inverter housing 42.

  Next, the configuration around the connection portion between the lead conductor 24 of the stator 22 and the terminal 35 of the inverter 2 will be described.

  As shown in FIGS. 1A and 1B, the power module 31, the DC bus bar 32, the smoothing capacitor 33, and the circuit board 34 that constitute the inverter 3 are arranged around the rotating shaft 21. The maximum outer diameter D1 of the inverter 3 is formed to be smaller than the minimum inner diameter D2 of the stator 22 with the rotation shaft 21 as the center. Accordingly, the outer diameter (diameter) D3 of the cylindrical main body 421 of the inverter casing 42 is made smaller than the outer diameter (diameter) D4 of the motor casing 411, for example, substantially equal to the inner diameter of the stator 22 of the motor 2. ing.

  Further, as shown in FIG. 1B, through holes 431 through which the lead conductors 24 of the six stators 22 corresponding to the six poles pass are discretely formed in the partition bracket 43 with a predetermined interval, and the six holes corresponding to the six poles. Through holes 426 through which the terminals 35 of one inverter 3 pass are discretely formed in the cylindrical main body 421 of the inverter housing 42 with a predetermined interval. In consideration of workability when pulling out the terminal 35 of the inverter 3, it is desirable that the through hole 426 is a slit as shown in FIG. 1B. FIG. 2 is a perspective view of this portion. That is, in the motor 1 with an inverter of this example, the lead conductor 24 of the stator 22 that is an input part of the motor winding is drawn out of the motor casing 41, and the terminal 35 that is the output part of the power module 31 is connected to the inverter casing. The lead conductor 24 and the terminal 35 are connected to the outside of the motor housing 41 and the inverter housing 42.

  3A and 3B are diagrams respectively showing specific examples of the connection structure between the lead conductor 24 and the terminal 35. In the example shown in FIG. 3A, bolt through holes are formed in both the lead conductor 24 and the terminal 35. The bolts are inserted here and tightened with nuts to connect and fix them. In the example shown in FIG. 3B, a notch is formed in the lead conductor 24 and the terminal 35 is engaged with the notch, and then solder, brazing, laser welding, TIG welding, resistance welding, ultrasonic welding. The two are connected and fixed by, for example. Any means may be used, and both may be connected and fixed by other known means.

  Then, after connecting the lead conductor 24 and the terminal 35, an annular protective cover 44 is attached to the inverter housing in order to protect the lead conductor 24 and the terminal 35 exposed to the outside of the motor housing 41 and the inverter housing 42. The body 42 and the partition bracket 43 are assembled in a sealed state.

  As described above, in the motor 1 with an inverter of this example, the lead conductor 24 and the terminal 35 are connected to the outside of the motor housing 41 and the inverter housing 42 before the protective cover 44 is assembled. It is good. Therefore, it is not necessary to increase the size of the inverter housing 42 in order to improve workability compared to the case of connecting inside the inverter housing.

  Moreover, in the motor 1 with an inverter of this example, since the maximum outer diameter D1 of the inverter 3 centering on the rotating shaft 21 is formed smaller than the minimum inner diameter D2 of the stator 22 centering on the rotating shaft 21, the inverter When the attached motor 1 is assembled, the inverter 3 can be inserted and assembled to the motor housing 41 to which the stator 22 is assembled. Thereby, the assembly workability | operativity and assembly freedom degree of the inverter 3 improve.

  Moreover, in the motor 1 with an inverter of this example, since the cylindrical main body 421 of the inverter housing | casing 42 is made smaller diameter than the cylindrical main body 411 of the motor housing | casing 41, and close to the power module 31 which is a heat generating body, a power module The thermal resistance between 31 and the heat radiating fin 413 of the motor casing 41 via the inverter casing 42 is reduced. Thereby, the heat dissipation performance of the power module 31 is improved.

  Moreover, in the motor 1 with an inverter of this example, since the protective cover 44 is assembled | attached after connecting the lead conductor 24 and the terminal 35, the sealing reliability and insulation reliability of the connection part of the lead conductor 24 and the terminal 35 are improved. be able to.

<< Second Embodiment >>
4A is a cross-sectional view showing the motor 1 with an inverter according to the second embodiment of the present invention, FIG. 4B is a view taken along the arrow 4B shown in FIG. 4A, and the same members and the like as those in the first embodiment described above are the same. Reference numerals are attached and the description thereof is incorporated herein.

  In the motor 1 with an inverter according to the first embodiment described above, the casing 4 is configured by two members, that is, the motor casing 41 and the inverter casing 42, and these are fastened via the partition bracket 43. In the attached motor 1, the casing 4 includes a cylindrical main body 411 having both axial end surfaces open, and two brackets 412 that respectively close the both end surfaces of the cylindrical main body 411 and rotatably support the rotating shaft 21. , 422. The casing 4 is configured by one cylindrical main body 411, but a portion where the motor chamber 414 is formed is referred to as a motor casing 41, and a portion where the inverter chamber 424 is formed is referred to as an inverter casing 42.

  Then, as shown in FIGS. 4A and 4B, concave portions 416 are formed at the position of the cylindrical main body 411 corresponding to the position of the connecting portion between the lead conductor 24 and the terminal 35 (three in the illustrated example). A through hole 431 through which the lead conductor 24 passes and a through hole 426 through which the terminal 35 passes are formed in two surfaces of the recess 416 (a surface perpendicular to the surface parallel to the rotation shaft 21). FIG. 5 is a perspective view showing the recess 416. Then, after connecting the lead conductor 24 and the terminal 35, in order to protect the lead conductor 24 and the terminal 35 exposed to the outside of the motor casing 41 and the inverter casing 42, a lid corresponding to the opening shape of the recess 416 is provided. The body 45 is assembled in a sealed state with respect to the cylindrical main body 411. Radiating fins 451 are formed on the outer surface of the lid body 45. The shape of the concave portion 416 is not particularly limited, but at least the lid 45 has a depth that does not interfere with the lead conductor 24 and the terminal 35.

  In the motor with an inverter 1 of this example, the opening surface of the concave portion 416 for assembling the lid body 45 in a hermetically sealed state is constituted by one plane as shown in FIG. 4A, and the lid body 45 is formed in a flat plate shape. Further, in the motor 1 with an inverter of this example, as shown in FIG. 4A, the periphery M1 including the inverter 3, the periphery M2 including the stator 22, and the periphery M3 including the connection portion between the lead conductor 24 and the terminal 35 are It is sealed (resin mold) with a resin having electrical insulation. The sealing resin used in this case may be either a low molding pressure resin that can be molded at a low pressure such as a liquid resin or a high molding pressure resin that is molded at a high pressure such as a solid resin. In this example, considering that the inverter 3 is relatively weak against external stress, a low molding pressure resin is used for the periphery M1 including the inverter 3, and the periphery M2 including the stator 22 and the lead conductor 24 and the terminal 35. High molding pressure resin is used in the periphery M3 including the connection part.

  As described above, the inverter-equipped motor 1 of the present example has the following functions and effects in addition to the functions and effects of the first embodiment described above. That is, according to the motor 1 with an inverter of this example, when connecting the lead conductor 24 and the terminal 35 outside the housing 4, the concave portions 416 are discretely provided in the circumferential direction of the end portion of the housing 4. Therefore, the seal length between the opening of the recess 416 and the lid 45 is shorter than that in the first embodiment described above. Thereby, sealing reliability and insulation reliability can be improved.

  Further, according to the motor 1 with an inverter of the present example, the opening surface of the recess 416 is made flat and is sealed by the flat lid 45, so that the seal length can be further shortened, and the seal reliability is also improved. In addition, insulation reliability can be improved.

  Further, according to the motor 1 with an inverter of this example, the periphery of the connection portion between the stator 22 and the lead conductor 24 and the terminal 35 is sealed with a high molding pressure resin, and the periphery of the inverter 3 is sealed with a low molding pressure resin. Therefore, the strength reliability of the inverter 3 can be improved. In addition, since the connection portion between the lead conductor 24 and the terminal 35 is resin-sealed, the thermal resistance between the connection portion and the housing 4 is reduced, and the heat dissipation from the connection portion can be improved.

<< Third Embodiment >>
FIG. 6 is a cross-sectional view showing the inverter-equipped motor 1 according to the third embodiment of the present invention, in which members and the like common to the first and second embodiments described above are denoted by the same reference numerals, and The description is incorporated herein.

  In the second embodiment described above, the concave portion 416 is formed at the position of the cylindrical main body 411 corresponding to the position of the connecting portion between the lead conductor 24 and the terminal 35, and the lead conductor 24 and the terminal 35 are connected and sealed here. The lid 45 corresponding to the opening shape of the concave portion 416 is assembled in a sealed state with respect to the cylindrical main body 411. On the other hand, in the motor with an inverter 1 of this example, after the lead conductor 24 and the terminal 35 are connected, the recess 416 is only filled with the sealing resin M3, and the lid 45 is omitted. And when the sealing resin M3 is molded, the heat radiation fins 451 are simultaneously molded on the outer surface.

  As described above, the inverter-equipped motor 1 of the present example has the following operational effects in addition to or instead of the operational effects of the first embodiment and the second embodiment described above. That is, according to the inverter-equipped motor 1 of this example, the number of parts can be reduced by the amount of omission of the lid body 45, and the heat radiation from the connecting portion between the lead conductor 24 and the terminal 35 can be reduced by the heat radiation fin 451. Can be increased.

<< 4th Embodiment >>
FIG. 7 is a cross-sectional view showing an inverter-equipped motor 1 according to a fourth embodiment of the present invention, and members and the like common to the first embodiment and the second embodiment described above are denoted by the same reference numerals. The description is incorporated herein.

  In the motor 1 with an inverter according to the second embodiment described above, the casing 4 is configured by one cylindrical main body 411, the partition bracket 43 as in the first embodiment is omitted between the motor chamber and the inverter chamber, The rotating shaft 21 is supported by brackets 412 and 422 that close open surfaces of both end faces of the cylindrical main body 411. On the other hand, in the motor 1 with an inverter of this example, the housing 4 is configured by one cylindrical main body 411, but the partition bracket 43 as in the first embodiment is provided between the motor chamber 414 and the inverter chamber 424. The rotating shaft 21 is supported by the one bracket 412 and the partition bracket 43.

  The periphery including the inverter 3 is sealed with the low molding pressure resin M1, and the periphery including the stator 22 and the periphery including the connection portion between the lead conductor 24 and the terminal 35 are formed by the high molding pressure resins M2 and M3. However, by providing a gap S between the partition bracket 43 and the sealing resin M1 of the inverter 3, an air layer S having a large thermal resistance is formed here.

  As described above, the inverter-equipped motor 1 of the present example has the following operational effects in addition to or instead of the operational effects of the first embodiment and the second embodiment described above. That is, according to the motor 1 with an inverter of this example, the motor chamber 414 and the inverter chamber 424 are separated by the partition bracket 43, so that high-temperature air convection flowing from the motor chamber 414 into the inverter chamber 424 can be suppressed.

  Moreover, according to the motor 1 with an inverter of this example, since the air layer S is provided between the partition bracket 43 and the sealing resin M1 of the inverter 3, the heat between the motor chamber 414 and the inverter chamber 424 is obtained. Interference can be suppressed.

  The lead conductor 24 corresponds to a first conductor according to the present invention, and the terminal 35 corresponds to a second conductor according to the present invention.

DESCRIPTION OF SYMBOLS 1 ... Motor with inverter 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 41 ... Motor housing 411 ... Cylindrical body 412 ... Bracket 413 ... Heat radiation fin 414 ... Motor chamber 415 ... Bearing 416 ... Recess 42 ... Inverter housing 421 ... Cylinder body 422 ... Bracket 423 ... Heat radiation fin 424 ... Inverter chamber 425 ... Bearing 43 ... Partition bracket 431 ... Through hole 44 ... Protective cover 45 ... Lid 451 ... Radiating fin S ... Air layer (gap)
M1, M2, M3 ... Sealing resin

Claims (10)

In a motor with an inverter formed by integrating a motor housing in which a rotor and a stator are housed and an inverter housing in which an inverter power module is housed,
A first conductor that is an input part or an output part of the motor winding is drawn out of the motor casing, and a second conductor that is an output part or an input part of the power module is drawn out of the inverter casing. The motor with an inverter in which the first conductor and the second conductor are connected outside the motor casing and the inverter casing.   The motor with an inverter according to claim 1, wherein a maximum outer diameter of the inverter from the motor rotation shaft is smaller than a minimum inner diameter of the stator from the motor rotation shaft.   The motor with an inverter according to claim 2, wherein an outer diameter of the cylindrical main body of the inverter casing is smaller than an outer diameter of the cylindrical main body of the motor casing.   The protective cover which is provided in the said inverter housing | casing and the said motor housing | casing, and makes the connection part of the said 1st conductor and the said 2nd conductor at least a sealing state further. Motor with inverter. Concave portions formed discretely along the circumferential direction at the end of the inverter housing,
A through hole formed in one surface of the recess and through which the first conductor passes;
A through hole formed on the other surface of the recess and through which the second conductor passes;
The motor with an inverter as described in any one of Claims 1-3 which has a cover body which seals the opening surface of the said recessed part.   The motor with an inverter according to claim 5, wherein the opening surface of the concave portion is formed by a single plane, and the opening surface is closed by the flat lid member.   The motor with an inverter according to claim 5 or 6, wherein the stator, the recess, and the inverter are resin-molded, and the resin mold of the inverter is molded under a lower pressure condition than the resin mold of the stator and the recess. Concave portions formed discretely along the circumferential direction at the end of the inverter housing,
A through hole formed in one surface of the recess and through which the first conductor passes;
A through hole formed on the other surface of the recess and through which the second conductor passes,
The motor with an inverter according to any one of claims 1 to 3, wherein the concave portion is resin-molded, and heat radiation fins are formed on an outer surface of the resin mold portion. A bracket that partitions the interior of the motor housing from the interior of the inverter housing;
The motor with an inverter according to any one of claims 1 to 8, wherein the motor rotation shaft is supported by the bracket.   The motor with an inverter according to claim 9, wherein an air layer including a gap is formed between the bracket and the inverter housed in the inverter housing.

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