EP1382848A2 - Motor drive circuit and electric compressor having the same - Google Patents

Motor drive circuit and electric compressor having the same Download PDF

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Publication number
EP1382848A2
EP1382848A2 EP03015984A EP03015984A EP1382848A2 EP 1382848 A2 EP1382848 A2 EP 1382848A2 EP 03015984 A EP03015984 A EP 03015984A EP 03015984 A EP03015984 A EP 03015984A EP 1382848 A2 EP1382848 A2 EP 1382848A2
Authority
EP
European Patent Office
Prior art keywords
electrical components
substrate
drive circuit
motor drive
central axis
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP03015984A
Other languages
German (de)
English (en)
French (fr)
Inventor
Kazuya c/o K. K. Toyota Jidoshokki Kimura
Ken c/o K. K. Toyota Jidoshokki Suitou
Hiroyuki c/o K. K. Toyota Jidoshokki Gennami
Kazuhiro c/o K. K. Toyota Jidoshokki Kuroki
Kitaru c/o K. K. Toyota Jidoshokki Iwata
Masanori c/o K. K. Toyota Jidoshokki Sonobe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toyota Industries Corp
Original Assignee
Toyota Industries Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Toyota Industries Corp filed Critical Toyota Industries Corp
Publication of EP1382848A2 publication Critical patent/EP1382848A2/en
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
    • F04C23/00—Combinations of two or more pumps, each being of rotary-piston or oscillating-piston type, specially adapted for elastic fluids; Pumping installations specially adapted for elastic fluids; Multi-stage pumps specially adapted for elastic fluids
    • F04C23/008—Hermetic pumps

Definitions

  • the present invention relates to a motor drive circuit for driving an electric motor in an electric compressor and to an electric compressor with the motor drive circuit.
  • Unexamined Japanese Patent Publication No. 2002-155863 discloses a conventional electric compressor.
  • FIG. 5 a diagram illustrates a front end view of a motor compressor or an electric compressor 100 according to a prior art.
  • a compressor housing 101 forms an outer shell of the motor compressor 100.
  • An electric motor 102 and a compression mechanism 103 are accommodated in the compressor housing 101.
  • the compressor housing 101 includes a cylindrical circumferential wall 101a around a central axis L of the motor compressor 100, and a motor drive circuit 104 is arranged outside the circumferential wall 101 a.
  • the motor drive circuit 104 includes an inverter and the like for driving the electric motor 102.
  • a casing seat 105 has a planar fixing surface 105a and is provided on the circumferential wall 101a of the compressor housing 101.
  • a planar casing 106 for accommodating the motor drive circuit 104 is joined to the fixing surface 105a of the casing seat 105.
  • the motor drive circuit 104 largely protrudes in the transverse direction of the compressor housing 10 because the cylindrical circumferential wall 101 a of the compressor housing 101 is different in shape from the planar casing 106 of the motor drive circuit 104. Accordingly, the motor compressor 100 is relatively large in size in the radial direction of the central axis L.
  • the casing seat 105 needs to be provided on the circumferential wall 101a of the compressor housing 101 to compensate for the difference in shape between the cylindrical circumferential wall 101a and the planar casing 106.
  • the motor compressor 100 becomes heavy by the mass of the casing seat 105.
  • some trouble such as a mold cavity is possibly produced at the thick portion of the casing seat 105. Therefore, there is a need for a motor drive circuit and an electric compressor with the motor drive circuit that contribute to reducing the size and weight of the electric compressor.
  • a motor drive circuit for driving an electric motor in an electric compressor has a substrate and a plurality of electrical components.
  • the compressor includes a compressor housing having a circumferential wall around a central axis of the compressor.
  • the circumferential wall has a substantially cylindrical surface.
  • the substrate is arranged outside the circumferential wall and includes a first portion and a second portion. The first portion is closer to the central axis than the second portion.
  • the electrical components are mounted on the substrate on the near side relative to the central axis and include short electrical components that have relatively short height from the substrate and tall electrical components that have relatively tall height from the substrate.
  • the electrical components line the cylindrical surface of the circumferential wall in such a manner that the short and tall electrical components are respectively arranged at the first and second portions.
  • FIG. 1 a diagram illustrates a longitudinal cross-sectional view of a motor compressor or an electric compressor 10 according to the preferred embodiment of the present invention.
  • a compressor housing 11 forms an outer shell of the motor compressor 10 and includes a first housing element 21 and a second housing element 22.
  • the first housing element 21 has a substantially cylindrical circumferential wall 23 and an end wall that is formed on the left end of the circumferential wall 23 in the drawing.
  • the first housing element 21 is die-cast in an aluminum alloy.
  • the second housing element 22 forms a cylinder with an end wall on the right end in the drawing and is die-cast in an aluminum alloy.
  • the first and second housing elements 21, 22 are fixedly connected with each other so that a closed space 24 is defined in the compressor housing 11.
  • a rotary shaft 27 is rotatably supported by the first housing element 21 in the closed space 24 and has a central axis of rotation that is identical to the central axis L of the motor compressor 10.
  • the circumferential wall 23 of the first housing element 21 surrounds the central axis L of the motor compressor 10.
  • the electric motor 25 is a brushless direct current type or a brushless DC type and includes a stator 25a and a rotor 25b.
  • the stator 25a is fixedly connected to an inner surface 23a of the circumferential wall 23 of the first housing element 21.
  • the rotor 25b is provided on the rotary shaft 27 and is arranged inside the stator 25a.
  • the electric motor 25 rotates the rotary shaft by electric power that is supplied to the stator 25a.
  • the compression mechanism 26 is a scroll type and includes a fixed scroll member 26a and a movable scroll member 26b. As the movable scroll member 26b orbits relative to the fixed scroll member 26a in accordance with the rotation of the rotary shaft 27, the compression mechanism 26 compresses refrigerant gas or fluid. An outlet 32 is formed in the second housing element 22 for discharging the compressed refrigerant gas to an external refrigerant circuit, which is not shown in the drawing.
  • the refrigerant gas in relatively low temperature and relatively low pressure is introduced from the external refrigerant circuit into the compression mechanism 26 through the electric motor 25.
  • the introduced refrigerant gas is compressed to have relatively high temperature and relatively high pressure by the compression mechanism 26.
  • the refrigerant gas is discharged to the external refrigerant circuit through the outlet 32.
  • the refrigerant gas in relatively low temperature from the external refrigerant circuit cools the electric motor 25 as it passes by the electric motor 25.
  • FIG. 2 a diagram illustrates a side view of the motor compressor 10 according to the preferred embodiment of the present invention.
  • An inlet 31 is formed in the first housing element 21.
  • the refrigerant gas is introduced from the external refrigerant circuit into the compressor housing 11 through the inlet 31.
  • FIG. 3 a diagram illustrates a partially enlarged cross-sectional view that is taken along the line I-I in FIG. 2.
  • An outer surface 23b of the circumferential wall 23 is mostly formed along a cylindrical surface R having the central axis L.
  • the first housing element 21 partially includes an accommodating portion 36.
  • the accommodating portion 36 is provided on a portion of the outer surface 23b of the circumferential wall 23 and defines an accommodating space 35 inside.
  • the accommodating portion 36 includes a frame-shaped side wall 37 and a cover member 38.
  • the side wall 37 is integrally formed with the circumferential wall 23 and extends from the outer surface 23b.
  • the cover member 38 is fixedly connected to the distal end surface of the side wall 37 by a fixing frame 40.
  • the cover member 38 forms a thin plate and is made of metal such as an aluminum alloy.
  • a seal member 39 is interposed between the distal end surface of the side wall 37 and the outer peripheral portion of the cover member 38 for sealing the accommodating space 35.
  • the outer surface 23b of the circumferential wall 23 defines a bottom surface 35a of the accommodating space 35.
  • the bottom surface 35a is formed on the left end of the accommodating space 35 in the drawing.
  • the inner surface of the side wall 37 defines a side surface 35b of the accommodating space 35.
  • the first housing element 21 defines the bottom and side surfaces 35a, 35b of the accommodating space 35.
  • the cover member 38 defines a top surface 35c of the accommodating space 35. In other words, the top surface 35c is formed on the right end of the accommodating space 35 in the drawing.
  • a motor drive circuit 41 is accommodated in the accommodating space 35 in the accommodating portion 36 for driving the electric motor 25.
  • the motor drive circuit 41 includes an inverter and supplies the stator 25a of the electric motor 25 with electric power based on a command from an air conditioner ECU, which is not shown in the drawing.
  • the refrigerant gas cools the motor drive circuit 41 as it is introduced from the external refrigerant circuit to the compression mechanism 26 through the electric motor 25.
  • the motor drive circuit 41 includes a planar substrate 43 and a plurality of electrical components 44.
  • the substrate 43 is fixedly connected to the circumferential wall 23 by a fastener, such as a bolt, which is not shown in the drawing.
  • the substrate 43 is substantially in parallel with the central axis L of the motor compressor 10.
  • the electrical components 44 are respectively mounted on surfaces 43a, 43b of the substrate 43. Namely, the electrical components 44 are respectively mounted on the substrate 43 on the near and far sides relative to the central axis L.
  • the electrical components 44 include electrical components 44A through 44E and other electrical components, which are not shown in the drawing.
  • the electrical components 44 include known components for constituting the inverter. That is, the electrical components 44 include a switching device 44A, an electrolytic condenser 44B, a transformer 44C, a driver 44D, a fixed resistance 44E and the like.
  • the driver 44D is an integrated circuit chip or an IC chip for intermittently controlling the switching device 44A based on a command from the air conditioner ECU.
  • the switching device 44A has a height of h3 from the substrate 43 and is mounted on the surface 43a of the substrate 43, that is, on the substrate 43 on the near side relative to the central axis L. Some of the electrical components 44 are shorter than the switching device 44A if they are mounted on the same surface. The shorter electrical components 44 correspond to second electrical components. Only the above shorter electrical components 44 are mounted on the surface 43b of the substrate 43, that is, on the substrate 43 on the far side relative to the central axis L. The above shorter electrical components 44 include the driver 44D and the fixed resistance 44E.
  • the taller electrical components 44 have heights of h1, h2 from the substrate 43 and are taller than the switching device 44A.
  • the taller electrical components 44 and the switching device 44A are mounted on the surface 43a of the substrate 43, that is, on the substrate 43 on the near side relative to the central axis L.
  • the taller electrical components 44 correspond to first electrical components.
  • the taller electrical components 44 include the electrolytic condenser 44B and the transformer 44C. Accordingly, among the electrical components 44 on the surface 43a of the substrate 43, the switching device 44A corresponds to a short electrical component that has a relatively short height of h3 from the substrate 43, and the electrolytic condenser 44B and the transformer 44C correspond to tall electrical components that have relatively tall heights of h1, h2.
  • the electrical components 44 on the surface 43a are arranged as follows.
  • the short electrical components such as the switching device 44A are arranged at the middle portion of the surface 43a of the substrate 43.
  • the middle portion of the surface 43a of the substrate 43 corresponds to a first portion thereof.
  • the tall electrical components such as the electrolytic condenser 44B and the transformer 44C are arranged at both ends of the surface 43a, that is, the upper and lower ends of the surface 43a in FIG. 3.
  • the upper and lower ends of the surface 43a of the substrate 43 correspond to a second portion thereof. Namely, the short electrical components are arranged relatively closer to the central axis L, while the tall electrical components are arranged relatively farther from the central axis L.
  • the motor drive circuit 41 is installed to the compressor housing 11 in such a manner that the electrical components 44 on the surface 43a of the substrate 43 line the cylindrical surface R of the circumferential wall 23.
  • the switching device 44A, the electrolytic condenser 44B and the transformer 44C each are plurally arranged in the direction of the central axis L.
  • a clearance between the bottom surface 35a and the top surface 35c is relatively narrow at the middle region of the accommodating space 35 in the accommodating portion 36, and the short electrical components such as the switching device 44A are arranged at the middle region of the accommodating space 35.
  • Clearances between the bottom surface 35a and the top surface 35c are relatively wide at both end regions relative to the middle region of the accommodating space 35, and the tall electrical components such as the electrolytic condenser 44B and the transformer 44C are arranged at the above end regions.
  • the bottom surface 35a of the accommodating space 35 includes a convex surface at its middle where the bottom surface 35a approaches the top surface 35c to the maximum. Accordingly, in comparison to an accommodating space that includes an entire planar bottom surface, the accommodating space 35 partially forms the shape along the cylindrical surface R of the circumferential wall 23.
  • the electrical components 44 are arranged on the surface 43a of the substrate 43 along the cylindrical surface R of the circumferential wall 23. Therefore, the motor drive circuit 41 is arranged to approach the central axis L of the motor compressor 10 because the electrical components 44 line the cylindrical surface R of the circumferential wall 23.
  • the substrate 43 is arranged at a distance of h4 from the cylindrical surface R.
  • the distance h4 is shorter than the height h1 of the electrolytic condenser 44B that is the tallest in the electrical components 44.
  • the cylindrical surface R of the circumferential wall 23 approaches the surface 43a of the substrate 43 without any interference with the electrical components 44 on the surface 43a, that is, without crossing the electrical components 44 on the surface 43a.
  • the motor drive circuit 41 is arranged near the central axis L of the motor compressor 10 so that the cylindrical surface R of the circumferential wall 23 is arranged at the distance h4 from the substrate 43 and the distance h4 is shorter than the height h1 of the electrolytic condenser 44B.
  • the electrical components 44 line the cylindrical surface R of the circumferential wall 23 means a state where the the cylindrical surface R of the circumferential wall 23 approaches the surface 43a in such a manner that the distance h4 from the substrate 43 at least becomes shorter than the height h1 of the electrolytic condenser 44B while the cylindrical surface R of the circumferential wall 23 does not interfere with the electrical components 44 on the surface 43a.
  • the cylindrical surface R of the circumferential wall 23 approaches the surface 43a of the substrate 43 in such a manner that the distance h4 from the substrate 43 becomes shorter than the height h2 of the transformer 44C, which is the second tallest, and the cylindrical surface R does not interfere with the electrical components 44 on the surface 43a. Accordingly, the electrical components 44 on the surface 43a adjacently line the cylindrical surface R of the circumferential wall 23 so that the motor drive circuit 41 is arranged near the central axis L much closer.
  • the switching device 44A, the electrolytic condenser 44B and the transformer 44C are in contact with the bottom surface 35a of the accommodating space 35 through a sheet or an insulating member 45 made of rubber or resin.
  • the sheet 45 is interposed between the electrical components 44A, 44B, 44C and the first housing element 21 made of aluminum, respectively.
  • a material having properties of relatively high elasticity and/or relatively high heat conductivity is employed as the sheet 45.
  • a clearance between the top surface 35c of the cover member 38 and the motor drive circuit 41 is filled with a filler or an insulating member 46 made of rubber or resin.
  • the filler 46 has properties of relatively high elasticity and/or relatively high heat conductivity.
  • the filler 46 is interposed between the motor drive circuit 41 and the top surface 35c of the accommodating space 35 so that the top surface 35c is arranged relatively close to the central axis L, that is, the cover member 38 is arranged relatively close to the central axis L. Accordingly, the motor compressor 10 is further reduced in size. Also, in comparison to a state when an insulating space is defined, heat generated by the motor drive circuit 41 is efficiently conducted through the cover member 38 so that the motor drive circuit 41 is efficiently cooled.
  • the filler 46 When the filler 46 employs a material having relatively high heat conductivity, it contributes to further efficiently cooling the motor drive circuit 41. Meanwhile, since the filler 46 employs a material having relatively high elasticity, it contributes to protecting the motor drive circuit 41 against an impact from the outside. In addition, the filler 46 elastically deforms to cancel a dimensional tolerance so that the motor drive circuit 41 is in firmly contact with the cover member 38. This leads to improvement in heat radiation performance of the motor drive circuit 41 to the cover member 38.
  • FIG. 4 a diagram illustrates a partially enlarged cross-sectional view of a motor compressor.
  • the tall electrical components such as the electrolytic condenser 44B is arranged on one side to the short electrical components such as the switching device 44A in the motor drive circuit 41.
  • the transformer 44C is not shown in the drawing. However, the transformer 44C is arranged on the surface 43a on the far side relative to the central axis L in such a manner that the electrolytic condenser 44B and the transformer 44C line in the direction of the central axis L.
  • an electric motor and a compression mechanism are respectively accommodated in different compressor housings in a motor compressor.
  • a motor drive circuit is arranged in one of the compressor housing that accommodates the electric motor and the other that accommodates the compression mechanism.
  • the motor compressor is a hybrid compressor that includes two drive sources for driving the compression mechanism 26.
  • the two drive sources are an electric motor and an engine for driving a vehicle.
  • the compression mechanism 26 is not limited to a scroll type.
  • a piston type, a vane type and a helical type are applicable.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)
  • Motor Or Generator Frames (AREA)
EP03015984A 2002-07-15 2003-07-14 Motor drive circuit and electric compressor having the same Withdrawn EP1382848A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2002205272 2002-07-15
JP2002205272 2002-07-15
JP2003035655A JP2004100684A (ja) 2002-07-15 2003-02-13 モータ駆動回路及び電動コンプレッサ
JP2003035655 2003-02-13

Publications (1)

Publication Number Publication Date
EP1382848A2 true EP1382848A2 (en) 2004-01-21

Family

ID=29782047

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03015984A Withdrawn EP1382848A2 (en) 2002-07-15 2003-07-14 Motor drive circuit and electric compressor having the same

Country Status (3)

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US (1) US20040009078A1 (ja)
EP (1) EP1382848A2 (ja)
JP (1) JP2004100684A (ja)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103703249A (zh) * 2011-05-19 2014-04-02 法雷奥日本株式会社 包括组装装置的模块化电压缩机
EP2500516A3 (en) * 2011-03-16 2016-05-18 Kabushiki Kaisha Toyota Jidoshokki Compressor

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7273357B2 (en) * 2005-08-10 2007-09-25 Mitsubishi Heavy Industries, Ltd. Control device for electric compressor
EP1978253B1 (en) * 2006-01-25 2014-09-10 Kabushiki Kaisha Toyota Jidoshokki Electric compressor
JP2008215236A (ja) * 2007-03-06 2008-09-18 Mitsubishi Heavy Ind Ltd 車載用電動圧縮機
JP5130005B2 (ja) * 2007-08-07 2013-01-30 カルソニックカンセイ株式会社 電動コンプレッサ
US8402750B2 (en) * 2010-12-07 2013-03-26 Tenneco Automotive Operating Company Inc. Reagent tank normalizing system
JP5353992B2 (ja) * 2011-10-31 2013-11-27 株式会社豊田自動織機 電動コンプレッサ
JP5915384B2 (ja) * 2012-05-30 2016-05-11 株式会社豊田自動織機 電動圧縮機
JP5751291B2 (ja) * 2013-07-30 2015-07-22 株式会社豊田自動織機 電動圧縮機
DE102014114837A1 (de) * 2014-10-13 2016-04-14 Bitzer Kühlmaschinenbau Gmbh Kältemittelverdichter
JP2017229134A (ja) * 2016-06-21 2017-12-28 株式会社ジェイテクト 機電一体型モータユニット
US20220393556A1 (en) * 2019-09-30 2022-12-08 Nidec Corporation Motor unit
CN115104241A (zh) * 2020-02-28 2022-09-23 日立安斯泰莫株式会社 电子控制装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2500516A3 (en) * 2011-03-16 2016-05-18 Kabushiki Kaisha Toyota Jidoshokki Compressor
CN103703249A (zh) * 2011-05-19 2014-04-02 法雷奥日本株式会社 包括组装装置的模块化电压缩机
CN103703249B (zh) * 2011-05-19 2016-04-20 法雷奥日本株式会社 包括组装装置的模块化电压缩机

Also Published As

Publication number Publication date
US20040009078A1 (en) 2004-01-15
JP2004100684A (ja) 2004-04-02

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