US20140147306A1 - Structure and method for adjusting balance of turbocharging device incorporating electric motor - Google Patents

Structure and method for adjusting balance of turbocharging device incorporating electric motor Download PDF

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Publication number
US20140147306A1
US20140147306A1 US14/117,803 US201214117803A US2014147306A1 US 20140147306 A1 US20140147306 A1 US 20140147306A1 US 201214117803 A US201214117803 A US 201214117803A US 2014147306 A1 US2014147306 A1 US 2014147306A1
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United States
Prior art keywords
rotational balance
rotor
balance adjusting
electromagnetic steel
rotor core
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.)
Abandoned
Application number
US14/117,803
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English (en)
Inventor
Yukio Yamashita
Noriyuki Hayashi
Seiichi Ibaraki
Katsuyuki Osako
Motoki Ebisu
Byeongil An
Hiroshi Suzuki
Hideaki Arita
Takashi Goto
Toshihiko Miyake
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Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
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 Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD. reassignment MITSUBISHI HEAVY INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: AN, BYEONGIL, EBISU, MOTOKI, HAYASHI, NORIYUKI, IBARAKI, SEIICHI, OSAKO, KATSUYUKI, SUZUKI, HIROSHI, YAMASHITA, YUKIO, MIYAKE, TOSHIHIKO, ARITA, HIDEAKI, GOTO, TAKASHI
Publication of US20140147306A1 publication Critical patent/US20140147306A1/en
Abandoned 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
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/04—Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump
    • F02B37/10—Engines with exhaust drive and other drive of pumps, e.g. with exhaust-driven pump and mechanically-driven second pump at least one pump being alternatively or simultaneously driven by exhaust and other drive, e.g. by pressurised fluid from a reservoir or an engine-driven pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
    • F01D5/02—Blade-carrying members, e.g. rotors
    • F01D5/027—Arrangements for balancing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B37/00—Engines characterised by provision of pumps driven at least for part of the time by exhaust
    • F02B37/005—Exhaust driven pumps being combined with an exhaust driven auxiliary apparatus, e.g. a ventilator
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B39/00—Component parts, details, or accessories relating to, driven charging or scavenging pumps, not provided for in groups F02B33/00 - F02B37/00
    • F02B39/02—Drives of pumps; Varying pump drive gear ratio
    • F02B39/08—Non-mechanical drives, e.g. fluid drives having variable gear ratio
    • F02B39/10—Non-mechanical drives, e.g. fluid drives having variable gear ratio electric
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/04—Balancing means
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
    • F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
    • F05D2220/00—Application
    • F05D2220/40—Application in turbochargers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/16—Centring rotors within the stators
    • H02K15/165—Balancing the rotors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

Definitions

  • the present invention relates to a structure and a method for adjusting rotational balance of a rotor of a turbocharging device incorporating an electric motor turbocharging suction air to an internal combustion.
  • the turbocharging device incorporating an electric motor includes a turbo charger incorporating a motor generator, a turbo charger incorporating an electric motor, an electric supercharger, and the like.
  • Turbo chargers for compressing and turbocharging suction air by driving with exhaust gas of an internal combustion has been widely used, in order to improve output of the internal combustion.
  • turbo charger incorporating a motor generator that improves acceleration responsiveness by incorporating an electric motor in a rotary shaft of the turbocharging device and assisting the acceleration of rotation of a compressor impeller, and collects energy by converting exhaust gas energy into electric energy.
  • the turbo charger incorporating a motor generator is an electric supercharger that rotates a compressor impeller by only an electric motor.
  • FIG. 6 is a schematic configuration diagram of an engine 01 mounted with a turbo charger 03 incorporating a motor generator disclosed in Japanese Patent Application Laid-open No. H8-182382 (Patent Document 1).
  • a turbine wheel 031 of the turbo charger incorporating a motor generator 03 is driven by exhaust gas from an exhaust manifold 011 of the engine 01 .
  • a compressor impeller 032 coaxially connected to the turbine wheel 031 is driven, so that suction air from an air cleaner (not shown) is supplied to the engine 01 via a suction manifold 012 .
  • a motor rotor 05 for assisting rotation (driving) of the compressor impeller 032 is disposed on the intermediate-portion of a shaft 041 for connecting the turbine wheel 031 and the compressor impeller 032 .
  • the motor rotor 05 is axially rotatably supported on a pair of bearing support parts provided in a housing (not shown) of the turbo charger incorporating a motor generator 03 via bearings 049 .
  • Reference numeral 06 denotes an engine control unit (ECU), which controls operation of the engine 01 , flows a current to a stator 033 depending on the operation status of the engine 1 , and also controls operation of the turbo charger incorporating a motor generator 03 .
  • Reference numeral 07 denotes a battery, which is a power supply of a controller.
  • FIG. 7 is a schematic configuration diagram of a conventional motor rotor.
  • a motor rotor 05 has a step part 044 that is a narrow shaft part on a side closer to a compressor impeller 043 , on an intermediate part in the thrust direction of a shaft 041 having an end mounted with a turbine wheel 042 .
  • a nut 046 which is screwed with a screw part formed on the end of the narrow shaft part, through a thrust bush 056 , a rotor 051 , an oil seal accessory 054 , and the compressor impeller 043 which are fitted with (fitted onto) the narrow shaft part, presses and positions these components with respect to the step part 044 .
  • a magnet 052 (permanent magnet) is fitted onto the narrow shaft part of the shaft 041 , a sleeve 057 is further fitted onto the outer peripheral part of the magnet 052 to be fixed to the narrow shaft part of the shaft 041 , thereby forming the rotor 051 .
  • the sleeve 057 needs to be fitted onto the outer peripheral part of the magnet arranged on the rotor 051 , in order to prevent breakage and scattering of the magnet.
  • a stator 033 for rotating and driving the shaft 041 by utilizing magnetism of the magnet of the rotor 051 is arranged on the housing side of the turbo charger incorporating a motor generator 03 , facing the rotor 051 .
  • Patent Document 2 Japanese Patent Application Laid-open No. 2000-145468
  • turbo charger incorporating a motor generator is used under a high temperature environment resulting from exhaust gas, performance of a motor that utilizes a magnet significantly deteriorates with rise in temperature, and such a motor is not suitable.
  • the magnetic inductor type motor is configured that a rotor made of laminated electromagnetic steel plates and iron, or laminated electromagnetic steel plates are driven by a stator arranged around the rotor.
  • the rotor rotates at a high speed in a state of being arranged between a turbine wheel and a compressor impeller, it is important to adjust the rotational balance (dynamic balance) of the rotor made of the laminated electromagnetic steel plates and iron, or the laminated electromagnetic steel plates for balancing. Therefore, the adjustment of the rotational balance on a conventional adjustment part (e.g., a nut part for fastening the compressor impeller to a rotary shaft of the turbo charger) can not cope with increase in an adjustment amount, or fine adjustment.
  • a conventional adjustment part e.g., a nut part for fastening the compressor impeller to a rotary shaft of the turbo charger
  • the present invention has been conceived in order to solve such problems, and an object thereof is to provide a structure and a method for adjusting balance of a turbo charger incorporating a motor generator capable of achieving increase in adjustment parts (increase in an adjustment amounts and ensuring fine adjustment) for adjusting the rotational balance of a rotary shaft of the turbo charger, and preventing performance deterioration while maintaining sufficient motor driving force even under a high temperature condition.
  • a balance adjusting structure for a turbocharging device incorporating an electric motor includes: at least one rotor blade disposed in a housing; a shaft connected to the rotor blade; a bearing formed in the housing, and configured to rotatably axially support the shaft; a rotor core penetrated by the shaft; and a stator disposed at a position facing the rotor core in the housing, and configured to rotate and drive the rotor core together with the shaft by a magnetic field, wherein the rotor core has a sleeve fitted onto the shaft, a plurality of electromagnetic steel plates laminated in an axial direction of the sleeve and fitted onto the sleeve, and a rotational balance adjusting member disposed on a part of the electromagnetic steel plates in a laminating direction, and having a thickness larger than a thickness of each electromagnetic steel plate, and the rotational balance adjusting member is processed to adjust rotational balance.
  • the rotational balance adjusting member is made of a magnetic material, for example, iron, and hence magnetic force resulting from magnetic induction is strengthened. This contributes to improvement of performance as a turbo charger with improvement of performance as an electric motor.
  • the rotor core is preferably configured such that the rotational balance adjusting member is interposed on an intermediate part in the laminating direction of the laminated electromagnetic steel plates.
  • the rotational balance adjusting member is interposed on the intermediate part in the laminating direction of the laminated electromagnetic steel plates, particularly on a central part is referred to as a center ring.
  • the rotational balance adjusting member that is interposed on the intermediate part in the laminating direction of the laminated electromagnetic steel plates, particularly on the central part, and hence magnetic induction on the both sides of the rotational balance adjusting member is uniformed, thereby improving output as a motor.
  • the rotor core preferably includes the sleeve fitted onto the shaft, the plurality of electromagnetic steel plates fitted onto the sleeve, and arranged as a lamination, and a rotational balance adjusting member fixed to both ends of the sleeve, and configured to fix and sandwich the plurality of electromagnetic steel plates.
  • the rotor core preferably includes a rotational balance adjusting member fitted onto the sleeve, and interposed on an intermediate part in the laminating direction of the plurality of electromagnetic steel plates that are arranged as a lamination, and a rotational balance adjusting member configured to fix and sandwich both ends of the laminated electromagnetic steel plates, and fixed to both ends of the sleeve.
  • the rotational balance adjustment portions are fixed to the both ends and the intermediate part of the sleeve, and the number of the adjustment portions increases. Therefore, even when rotational balance adjustment singly using the rotor core that requires a large number of steps is omitted, and merged into final rotational balance adjustment after the assembly of the rotor, an adjustment amount can be greatly expanded. Consequently, high accurate rotational balance adjustment is possible.
  • At least one balance adjustment member of the balance adjustment members is preferably configured by assembling laminated layers of the same magnetic material as the electromagnetic steel plates of the rotor core.
  • the center ring is made of, for example, an electromagnetic steel plate being a magnetic material or iron, and hence magnetic force resulting from magnetic induction is strengthened.
  • an electromagnetic steel plate being a magnetic material or iron
  • magnetic force resulting from magnetic induction is strengthened.
  • the electromagnetic steel plate is used for the center ring, and hence assembly of the center ring is completed in a step of assembling the electromagnetic steel plates of the rotor core. Consequently, the number of assembly steps can be further reduced.
  • the turbocharging device incorporating an electric motor is preferably either a turbo charger incorporating a motor generator that is mounted with a turbine wheel, which is a rotor blade for utilizing exhaust gas energy on an end of the shaft penetrated by the rotor core and the bearing, and that is mounted with a compressor impeller, which is a rotor blade for compressing inlet air on other end thereof, or an electric supercharger that does not have the turbine wheel and that is mounted with a compressor impeller for compressing inlet air only on one end of the shaft.
  • a rotational balance adjusting method for a rotor of a turbo charger incorporating a motor generator includes the steps of: performing rotational balance adjustment by singly using a rotor blade, for example, such as a turbine wheel, and a compressor impellor; assembling a rotor including the turbine wheel, the compressor impellor, and a rotor core having a rotational balance adjusting member made of a magnetic material; measuring a balance amount by rotating the rotor; and adjusting and processing rotational balance by using an compressor fastening nut, the rotational balance adjusting member of the rotor core, or both of the compressor fastening nut and the rotational balance adjusting member, on the basis of a result of measurement.
  • the compressor fastening nut and the rotational balance adjusting member of the rotor core enable the rotational balance adjustment portions, and increase in the number of the adjustment portions and fine adjustment are possible. Consequently, even when rotational balance adjustment singly using the rotor core that requires a large number of steps is omitted, and merged into final rotational balance adjustment after the assembly of the rotor, high accurate rotational balance adjustment is possible.
  • a step of adjusting rotational balance by singly using the rotor core before the step of assembling the rotor may be further added.
  • the step of adjusting rotational balance by singly using the rotor core is further added, and hence it is possible to obtain the rotor with higher accurate rotational balance.
  • rotational balance has been adjusted by cutting a nut for fastening a shaft on a compressor impeller
  • the rotational balance adjusting member enabling balance adjustment is added to the rotor core in addition to the nut part, so that the number of portions where the rotational balance is adjusted increases, thereby enabling higher accurate rotational balance adjustment.
  • the rotational balance adjusting member is made of a magnetic material, for example, iron, and hence magnetic force resulting from magnetic induction is strengthened. This contributes to improvement of performance as a turbo charger with improvement of performance as an electric motor.
  • FIG. 1 is a schematic structure diagram of a turbine rotor according to a first embodiment of the present invention
  • FIG. 2 is a schematic structure diagram of a turbine rotor according to a second embodiment of the present invention.
  • FIG. 3 is a schematic structure diagram of a turbine rotor according to a third embodiment of the present invention.
  • FIG. 4 is a flowchart of processes of rotational balance adjustment work of the turbine rotor according to the first embodiment of the present invention
  • FIG. 5 is a flowchart of processes of another rotational balance adjustment work of the turbine rotor according to the first embodiment of the present invention
  • FIG. 6 shows a schematic configuration diagram of an engine mounted with a conventional turbo charger incorporating a motor generator
  • FIG. 7 shows a schematic explanatory diagram of a conventional turbine rotor.
  • a turbine rotor according to a first embodiment of the present invention will be described with reference to FIG. 1 .
  • a turbine rotor 1 includes a shaft 4 , a turbine wheel 2 disposed on one end of the shaft 4 , a compressor impeller 3 disposed on the other end thereof, two bearings 7 disposed between the turbine wheel 2 and the compressor impeller 3 at intervals, and a rotor core 5 that serves as an electric rotor, and is disposed between the two bearings 7 , and the rotor core 5 is mounted on the shaft 4 via a sleeve 53 .
  • the present invention is applicable to both of a case where the respective bearings 7 are arranged on both outer ends of the rotor core 5 as described above, and a case where the two (pair of) bearings 7 are arranged between the turbine wheel 2 and the rotor core 5 at intervals.
  • the shaft 4 is a solid shaft, has a stepped part 44 narrowed from an intermediate part, and is a rotary shaft having a thick portion 41 on one end and a narrow portion 42 on the other end.
  • the turbine wheel 2 that is driven by exhaust gas is fixed to the end of the thick portion 41 of the shaft 4 .
  • the bearing 7 fixed to a bearing support part formed in a turbine housing (not shown) is disposed on a back surface side of the turbine wheel 2 via a first seal ring 43 formed integrally with the shaft 4 .
  • the rotor core 5 that incorporates the sleeve 53 is fitted onto the narrow portion 42 of the shaft 4 by employing, as a stopper, the stepped part 44 being a stopper part.
  • the rotor core 5 is configured such that a plurality of electromagnetic steel plates 51 having circular circumference are inserted around the sleeve 53 to be laminated in the plate thickness direction of the electromagnetic steel plates 51 .
  • a center ring 52 that is a rotational balance adjusting member, and is made of an electromagnetic steel plate being a magnetic material, or iron is interposed between the electromagnetic steel plates on the intermediate part, particularly the central part, in the laminating direction of the laminated electromagnetic steel plates 51 .
  • the rotor core 5 has a structure of regulating relative movement in the rotational direction with the shaft 4 by application of proper pressing by the second seal ring 46 interposed between the nut 31 and the rotor core 5 .
  • the bearings 7 disposed between the rotor core 5 and the compressor impeller 3 is fitted onto the sleeve 45 .
  • the center ring 52 serves as an adjustment cut part of the rotational balance of the turbine rotor 1 , in addition to the nut 31 , thereby increasing an adjustment range of the rotational balance.
  • the center ring 52 has a diameter larger than that of the nut 31 , and hence effects of the balance adjustment of the center ring 52 is larger even if the cutting amount is unchanged, and high accurate adjustment is possible in a wide range. Furthermore, fine adjustment is possible.
  • the rotational balance adjusting member made of an electromagnetic steel plate or iron is disposed on the intermediate part, particularly on the central part, of the laminated electromagnetic steel plates 51 , and hence magnetic induction amounts on the both sides of the rotational balance adjusting member are uniformed, thereby exerting an effect of improving output as a motor.
  • the center ring 52 that serves as the rotational balance adjusting member is disposed on the intermediate part, particularly on the central part, in the laminating direction of the electromagnetic steel plates 51 .
  • an action effect as the rotational balance adjusting member can be obtained.
  • the rotational balance adjustment of the turbine wheel 2 and the compressor impeller 3 is performed (cut) on the rear side of the rear side (X part (see FIG. 1 )) of the turbine wheel 2 and on the rear side of the rear side (Y part (see FIG. 1 )) of the compressor impeller 3 .
  • Step S 3 of assembling the turbine rotor 1 by mounting the turbine wheel 2 , the compressor impeller 3 , the rotor core 5 , the bearings 7 , the sleeve 45 , and the like on the shaft 4 .
  • Step S 5 the cutting work order as to which cutting work is first performed, the cutting work of the nut 31 or the cutting work of the center ring 52 may be determined every time the cutting work is performed.
  • Step S 6 the balance adjustment is terminated by Step S 6 of confirming the balance of the turbine rotor 1 .
  • Step S 6 In a case where the result of measurement in Step S 6 is not an arbitrary balance amount or less, Step S 5 and Step S 6 are repeatedly performed.
  • the adjustment portions for rotational balance of the assembled turbine rotor 1 are the balance adjustment A of the nut 31 , and the balance adjustment B of the center ring 52 , and hence the balance adjustment amount is increases with increase in the balance adjustment portions, and high accurate balance adjustment is possible in a wide range. Furthermore, fine adjustment is also possible.
  • the center ring 52 has a diameter lager than that of the nut 31 , and hence the effects of the balance adjustment of the center ring 52 are larger even if the cutting amount is unchanged. Accordingly, the cutting work of the nut 31 can be sometimes omitted by first performing the adjustment cutting of the center ring 52 , and reduction in the number of processes can be expected.
  • the rotational balance adjustment of the turbine wheel 2 and the compressor impeller 3 is performed on the rear side (X part) of the turbine wheel 2 and on the rear side (Y part) of the compressor impeller 3 .
  • Step S 13 of assembling the turbine rotor 1 by mounting the turbine wheel 2 , the compressor impeller 3 , the rotor core 5 , the bearings 7 , the sleeve 45 , and the like on the shaft 4 .
  • Step S 15 the cutting work order as to which cutting work is first performed, the cutting work of the nut 31 or the cutting work of the center ring 52 may be determined every time the cutting work is performed.
  • Step S 16 the balance adjustment is performed by Step S 16 of confirming the balance of the turbine rotor 1 .
  • Step S 16 In a case where the result of measurement in Step S 16 is an arbitrary balance amount or more, Step S 15 and Step S 16 are repeatedly performed.
  • a rotor core 8 is configured such that a plurality of electromagnetic steel plates 51 are disposed on a sleeve 81 fitted onto a narrow portion 42 of a shaft 4 .
  • the sleeve 81 is formed with a flange part 82 radially from an open edge on one end side of the sleeve 81 .
  • the electromagnetic steel plates 51 are fitted onto the sleeve 81 so as to be laminated in the thrust direction of the sleeve 81 .
  • a pressing ring 83 is fitted onto the outer peripheral part of the sleeve 81 to be fixed in caulking to the sleeve 81 in a state of pressing the electromagnetic steel plates 51 in the thrust direction.
  • a center target 55 having an outer diameter substantially identical with that of the electromagnetic steel plates 51 , and a thickness larger than that of each electromagnetic steel plate 51 is disposed between the electromagnetic steel plates 51 and the flange part 82 .
  • the center target 55 is a part of a revolution speed detection unit used in a case where the revolution speed of the turbine rotor 1 is controlled. In a case where the revolution speed does not need to be detected, the center target 55 is unnecessary.
  • the rotor core 8 is pressed against a stepped part 44 via a compressor impeller 3 and a sleeve 45 by a nut 43 , thereby preventing slip in the rotational direction with respect to the shaft 4 .
  • the flange part 82 and the pressing ring 83 each have an outer diameter substantially identical with that of each electromagnetic steel plate 51 , and have an action as a rotational balance adjusting member.
  • the electromagnetic steel plates 51 are fitted onto the sleeve 81 in a laminated manner, and the both sides of the electromagnetic steel plates 51 are sandwiched between the flange part 82 and the pressing ring 83 , thereby facilitating assembly of the shaft 4 and improving the quality of the assembly.
  • a balance adjustment part C of the flange part 82 , and a balance adjustment part D of the pressing ring 83 serve as rotational balance adjustment portions, in addition to a balance adjustment part A of the nut 43 , thereby increasing an adjustment amount of the rotational balance, and enabling fine adjustment.
  • a rotor core 9 is configured such that a plurality of electromagnetic steel plates 51 and a center ring 52 being a rotational balance adjusting member are disposed on a sleeve 81 fitted onto a narrow portion 42 of a shaft 4 .
  • the sleeve 81 is formed with a flange part 82 radially from an open edge on the one end side of the sleeve 81 .
  • the electromagnetic steel plates 51 are fitted onto the sleeve 81 so as to be laminated in the thrust direction of the sleeve 81 .
  • the center ring 52 being a rotational balance adjusting member is disposed on the intermediate part of the laminated electromagnetic steel plates 51 in the thrust direction of the sleeve 81 , particularly on the central part.
  • a pressing ring 83 is fitted onto the outer peripheral part of the sleeve 81 to be fixed in caulking to the sleeve 81 in a state of pressing the electromagnetic steel plates 51 in the thrust direction.
  • the electromagnetic steel plates 51 are fitted onto the sleeve 81 in a laminated manner, and the both sides of the electromagnetic steel plates 51 are sandwiched between the flange part 82 and the pressing ring 83 , thereby forming the rotor core 8 in a cartridge-type, facilitating assembly to the shaft 4 , and improving the quality of the assembly. Additionally, both sides of the electromagnetic steel plates 51 are sandwiched between the flange part 82 and the pressing ring 83 , thereby regulating relative movement of the electromagnetic steel plates 51 and the sleeve 81 during rotation, and easily forming the rotor core 8 in a cartridge type.
  • center ring 52 is interposed on the intermediate part (central part) of the laminated electromagnetic steel plates 51 , and hence magnetic induction is uniformed, thereby improving output as a motor.
  • a balance adjustment part C of the flange part 82 , a balance adjustment part D of the pressing ring 83 , and a balance adjustment part B of the center ring 52 serve as rotational balance adjustment portions, in addition to a balance adjustment part A of a nut 43 , thereby increasing an adjustment amount of the rotational balance, and enabling fine adjustment.
  • a motor generator is incorporated in a rotary shaft of a turbo charger that is driven by exhaust gas of the internal combustion, and compresses and turbocharges supply air, and the rotation of a compressor impeller is assisted for acceleration, thereby improving acceleration responsiveness.
  • the turbo charger incorporating a motor generator is suitable for use in an internal combustion that is capable of converting exhaust gas energy into electric energy.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Power Engineering (AREA)
  • Supercharger (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US14/117,803 2011-06-08 2012-06-04 Structure and method for adjusting balance of turbocharging device incorporating electric motor Abandoned US20140147306A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2011127913A JP5615231B2 (ja) 2011-06-08 2011-06-08 電動機内蔵過給装置のバランス調整構造とその方法
JP2011-127913 2011-06-08
PCT/JP2012/064395 WO2012169463A1 (ja) 2011-06-08 2012-06-04 電動機内蔵過給装置のバランス調整構造とその方法

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US (1) US20140147306A1 (enrdf_load_stackoverflow)
EP (1) EP2719875B1 (enrdf_load_stackoverflow)
JP (1) JP5615231B2 (enrdf_load_stackoverflow)
CN (1) CN103620182B (enrdf_load_stackoverflow)
WO (1) WO2012169463A1 (enrdf_load_stackoverflow)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20140125208A1 (en) * 2011-06-08 2014-05-08 Mitsubishi Heavy Industries, Ltd. Motor rotor structure for electric turbo charger and method of assembling same
US20150118044A1 (en) * 2013-10-25 2015-04-30 Ecomotors, Inc. Bearings for a Turbomachine Having an Electric Motor
US20160208682A1 (en) * 2013-11-12 2016-07-21 Kawasaki Jukogyo Kabushiki Kaisha Rotary unit of supercharger for engine and balance adjustment method thereof
US9957981B1 (en) 2017-04-13 2018-05-01 Borgwarner Inc. Turbocharger having compressor portion with imbalance correction region
US20190006923A1 (en) * 2017-06-30 2019-01-03 Tesla, Inc. Electric drive unit
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