WO2020110238A1 - 電動機 - Google Patents

電動機 Download PDF

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Publication number
WO2020110238A1
WO2020110238A1 PCT/JP2018/043830 JP2018043830W WO2020110238A1 WO 2020110238 A1 WO2020110238 A1 WO 2020110238A1 JP 2018043830 W JP2018043830 W JP 2018043830W WO 2020110238 A1 WO2020110238 A1 WO 2020110238A1
Authority
WO
WIPO (PCT)
Prior art keywords
detector
electric motor
cover
bracket
detector cover
Prior art date
Application number
PCT/JP2018/043830
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
治之 長谷川
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2019531490A priority Critical patent/JP6608098B1/ja
Priority to PCT/JP2018/043830 priority patent/WO2020110238A1/ja
Priority to KR1020217010303A priority patent/KR102256362B1/ko
Priority to CN201880099708.3A priority patent/CN113169628B/zh
Publication of WO2020110238A1 publication Critical patent/WO2020110238A1/ja

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/18—Casings or enclosures characterised by the shape, form or construction thereof with ribs or fins for improving heat transfer
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H02K9/223—Heat bridges
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/22—Arrangements for cooling or ventilating by solid heat conducting material embedded in, or arranged in contact with, the stator or rotor, e.g. heat bridges
    • H02K9/227—Heat sinks

Definitions

  • the present invention relates to an electric motor that includes a detector that detects the rotational position of a rotor.
  • a detector When a motor is controlled with high accuracy, a detector is used to detect the rotational position of the rotor.
  • the detector is composed of electronic parts, optical parts, magnetic parts, etc., but these parts are vulnerable to heat. Therefore, the temperature of the detector needs to be lower than that of the stator portion, which is the heat source of the electric motor.
  • a resin member cuts off heat generated on the stator side of the electric motor to suppress heat transfer to the detector. Further, in the electric motor described in Patent Document 1, since the metal detector cover has good heat dissipation, when the temperature of the detector rises, heat can be dissipated from the metal cover and an excessive temperature rise of the detector can be suppressed. ..
  • the motor described in Patent Document 1 can suppress the heat generated on the stator side of the motor from being transferred to the detector provided on the anti-load side.
  • the heat generated on the stator side of the motor is not transmitted to the anti-load side, the amount of heat generated on the stator side of the motor is radiated from the anti-load side, and the heat dissipation performance of the entire motor decreases To do.
  • the heat dissipation is lowered, there is a problem that the output of the electric motor needs to be reduced in order to suppress the heat generation amount of the electric motor.
  • the cooling efficiency is lowered when the electric motor is cooled by applying cold air to the anti-load side such as the cover portion of the detector.
  • the present invention has been made in view of the above, and an object of the present invention is to obtain an electric motor that can suppress both a rise in temperature of a detector and a decrease in heat radiation performance of the electric motor as a whole.
  • the present invention is an electric motor including a detector that detects a rotational position of a rotor, in which a frame to which a stator is attached and a detector are joined.
  • a metal bracket, a first detector cover that forms a space for accommodating a detector together with the bracket, and a heat radiating unit that is attached to the bracket and radiates heat accumulated in the bracket are provided.
  • the electric motor according to the present invention has the effect of suppressing the temperature rise of the detector and suppressing the decrease of the heat dissipation performance of the electric motor as a whole.
  • FIG. 1 is a diagram showing a configuration example of an electric motor 100 according to the first exemplary embodiment of the present invention.
  • FIG. 1 shows a cross section of the electric motor 100.
  • the electric motor 100 includes a shaft 1, a rotor 2, a stator 3, a frame 4, a first bracket 5, a second bracket 6, a first bearing 7, and a second bearing 8.
  • the detector 9, a first detector cover 10, and a second detector cover 11 are provided.
  • the detector 9 includes a printed circuit board 91 on which a detection circuit for detecting the rotational position of the rotor 2 is formed, a rotating plate 92, and a housing 93.
  • a load (not shown) is connected to the load side of the electric motor 100 via the shaft 1.
  • the opposite side of the load side is the anti-load side.
  • the detector 9 is provided on the non-load side of the electric motor 100. That is, the detector 9 is attached to the anti-load side of the electric motor 100 by being joined to the frame 4 by the second bracket 6.
  • the shaft 1 is connected to the rotor 2 and can rotate around the axis A together with the rotor 2.
  • the rotor 2 has a cylindrical shape, and a permanent magnet is provided on the curved surface facing the stator 3.
  • the stator 3 is composed of a coil and an iron core, and has a cylindrical space that houses the rotor 2. When an electric current flows through the coil, the stator 3 generates a magnetic force to rotate the rotor 2.
  • the stator 3 is attached to the frame 4.
  • the first bracket 5 is provided on the load side of the electric motor 100, and the second bracket 6 is provided on the anti-load side of the electric motor 100.
  • a first bearing 7 is installed on the side of the first bracket 5 facing the rotor 2, and a second bearing 8 is installed on the side of the second bracket 6 facing the rotor 2. There is.
  • the first bearing 7 and the second bearing 8 rotatably support the shaft 1.
  • the frame 4 is a metal frame.
  • the first bracket 5 and the second bracket 6 are metal brackets.
  • the rotary plate 92 of the detector 9 is attached to the anti-load side of the shaft 1 while being housed in the metal housing 93, and rotates together with the shaft 1 and the rotor 2.
  • the rotating plate 92 is provided with a slit, and the light passing through the slit is detected by a detection circuit formed on the surface of the printed board 91 facing the rotating plate 92, whereby the rotational position of the rotor 2 is specified. To be done.
  • the printed circuit board 91 is attached to the counter load side of the housing 93, and forms a housing space for the rotary plate 92 together with the housing 93.
  • the first detector cover 10 is a resin cover and is attached to the second bracket 6.
  • the first detector cover 10 surrounds the detector 9 together with the second bracket 6.
  • the second detector cover 11 is a metal cover and covers the first detector cover 10.
  • the second detector cover 11 is attached to the second bracket 6 with its inner surface in close contact with the first detector cover 10. In this way, the first detector cover 10 and the second detector cover 11 form the cover of the detector 9.
  • the first detector cover 10 and the second detector cover 11 are attached to the second bracket 6 to form a space in which the detector 9 is housed.
  • the thermal conductivity of the second detector cover 11 is higher than that of the first detector cover 10. In FIG. 1, the second detector cover 11 is configured to cover a part of the first detector cover 10, but the second detector cover 11 is configured to cover the entire first detector cover 10. Good.
  • the electric motor 100 has a metal second detector cover 11 arranged on the outside and a resin first detector cover 10 arranged on the inside. Therefore, the heat generated in the stator 3 is hard to be transferred to the detector 9, while the heat is efficiently transferred to the external second metal detector cover 11. That is, the heat generated by the stator 3 is transmitted to the second detector cover 11 via the frame 4 and the second bracket 6. As a result, the second detector cover 11 that is in contact with the outside air can radiate heat to the outside air and improve the heat dissipation of the entire electric motor 100.
  • the second detector cover 11 constitutes a heat radiating means for radiating the heat accumulated in the second bracket 6.
  • the electric motor 100 is provided with a cooling fan on the anti-load side, and when cool air from the fan is applied to the electric motor 100, heat is radiated from the second detector cover 11 efficiently and the electric motor 100 is cooled efficiently. It becomes possible to do.
  • the second detector cover 11 by forming the second detector cover 11 with a metal of a ferromagnetic material, it is possible to suppress the transmission of electromagnetic waves and magnetic flux from the outside to the detection circuit of the detector 9, and to obtain the effect of suppressing malfunction of the detector 9. .. Further, it is possible to prevent the electromagnetic wave and the magnetic flux generated inside the detector 9 from leaking to the outside. Since the second detector cover 11 is exposed to the outside air, it can be made resistant to corrosion by plating it to prevent corrosion or by using stainless steel (SUS: Steel Use Stainless). .. Further, since the second detector cover 11 is provided with the first detector cover 10 made of resin inside, it is not necessary to provide a seal structure for preventing foreign matter from entering the inside of the detector 9. Absent.
  • the accuracy of the shape of the second detector cover 11 and the processing accuracy when manufacturing the second detector cover 11 can be simplified, and the second detector can be manufactured by a relatively inexpensive method such as pressing.
  • the cover 11 can be manufactured. Further, even when the second detector cover 11 is manufactured by a method such as die casting and casting, it is not necessary to obtain accuracy by machining, and it is possible to attach a fin to the outside of the second detector cover 11. It is also possible to manufacture the second detector cover 11 and the first detector cover 10 by integral molding, reduce the number of parts, and reduce the number of assembly steps.
  • the surface area of the second detector cover 11 may be designed according to the heat radiation required for the electric motor 100 to operate normally, and it is not necessary to duplicate the portion where the connector is arranged.
  • the detector 9 When the detector 9 generates a large amount of heat, the heat of the detector 9 is released to the connector side, or a metal member is attached to the first detector cover 10 separately from the second detector cover 11, The heat of the detector 9 may be released from there. In this way, the thickness and shape of the second detector cover 11 are freely designed according to the required heat dissipation and function.
  • FIG. 2 is a diagram illustrating a modified example of the electric motor according to the first embodiment.
  • the electric motor 101 shown in FIG. 2 has a configuration in which a plate 12 which is a resin plate is inserted between the second bracket 6 of the electric motor 100 shown in FIG. 1 and the detector 9 and the first detector cover 10. Electric motor.
  • the plate 12 is provided to suppress the amount of heat transferred from the second bracket 6 to the detector 9. That is, in the electric motor 101, the metal second bracket 6 and the detector 9 are separated by the plate 12 having low heat conductivity, and the heat transmitted from the second bracket 6 to the detector 9 is further suppressed. You can The same effect can be obtained by forming the housing 93 supporting the printed circuit board 91 of the detector 9 from resin instead of adding the plate 12.
  • the plate 12 may be added and the housing 93 may be made of resin.
  • the surface of the second bracket 6 in contact with the detector 9 and the first detector cover 10 may be heat-insulated to make it difficult for heat to be transmitted to the detector 9.
  • the second detector cover 11 is fixed to the second bracket 6 with a metal screw, or the second detector cover 11 of the second bracket 6 contacts. It is possible to facilitate the transfer of heat from the second bracket 6 to the second detector cover 11 by machining the part to be subjected to machining to remove the heat insulating coating.
  • the housing 93 of the detector 9 may be heat-insulated to make it difficult for heat to be transferred to the inside of the detector 9.
  • the cover of the detector 9 includes the first detector cover 10 on the inner side close to the detector 9 and the second detector cover 11 on the outer side.
  • the first detector cover 10 is made of resin
  • the second detector cover 11 is made of metal.
  • the second detector cover 11 is in contact with the second bracket 6 made of metal.
  • the electric motor 101 includes a plate 12 between the second bracket 6 and the detector 9. According to the electric motors 100 and 101 according to the present embodiment, it is possible to suppress an increase in the temperature of the detector 9 and suppress deterioration of the heat dissipation performance of the electric motor as a whole.
  • the electric motor 101 can further suppress the temperature rise of the detector 9 as compared with the electric motor 100.
  • FIG. 3 is a diagram illustrating a configuration example of the electric motor according to the second embodiment.
  • the same components as those of the electric motor 100 according to the first embodiment shown in FIG. 1 are designated by the same reference numerals.
  • description of parts common to those of the electric motor 100 according to the first embodiment will be omitted.
  • the electric motor 102 has an air layer 13 between the first detector cover 10 and the second detector cover 11. That is, in the electric motor 100 according to the first embodiment, the first detector cover 10 and the second detector cover 11 are attached to the second bracket 6 in a state of being in close contact with each other to form the cover of the detector 9. Was there. On the other hand, in the electric motor 102, the cover of the detector 9 is formed by attaching the electric motor 102 to the second bracket 6 in a state where there is a gap between the first detector cover 10 and the second detector cover 11. is doing.
  • the cover of the detector 9 is formed by the air layer 13 provided in the.
  • the air layer 13 plays a role of heat insulation by providing the gap, that is, the air layer 13 between the first detector cover 10 and the second detector cover 11, and the second detector cover is provided.
  • the heat transfer from 11 to the first detector cover 10 is interrupted. As a result, the amount of heat transferred from the second detector cover 11 to the detector 9 is reduced. Further, the amount of heat released from the second detector cover 11 to the atmosphere is increased, and the heat dissipation of the entire electric motor 102 is improved.
  • the air layer 13 between the first detector cover 10 and the second detector cover 11 By providing the air layer 13 between the first detector cover 10 and the second detector cover 11, it is possible to make it difficult for the heat of the second detector cover 11 to be transferred to the first detector cover 10 side. Is possible.
  • the air layer 13 it is possible to allow cool air or cooling water to flow through the air layer 13 to efficiently cool the electric motor 102. Further, by sealing the space between the first detector cover 10 and the second detector cover 11 and then lowering the pressure of the air layer 13, the heat from the second detector cover 11 to the detector 9 side is reduced. It is possible to further reduce the conductivity.
  • the first detector cover 10 and the second detector cover 11 may be partially brought into contact with each other to keep the gap (thickness of the air layer 13) constant or to have strength.
  • the electric motor 102 according to the second embodiment has the air layer 13 as a gap between the first detector cover 10 and the second detector cover 11, and thus the electric motor according to the first embodiment.
  • the amount of heat conducted inside the detector 9 can be reduced, and the amount of heat radiated from the second detector cover 11 can be increased.
  • the electric motor 102 has a configuration in which a plate is inserted between the second bracket 6 and the detector 9, and the amount of heat transferred from the second bracket 6 to the detector 9 is You may make it suppress.
  • FIG. 4 is a diagram illustrating a configuration example of the electric motor according to the third embodiment. 4, the same components as those of the electric motor 102 according to the second embodiment shown in FIG. 3 are denoted by the same reference numerals as those in FIG. In the present embodiment, description of parts common to those of the electric motor 102 according to the second embodiment will be omitted.
  • the electric motor 103 is similar to the electric motor 102 according to the second exemplary embodiment in that the air between the first detector cover 10 and the second detector cover 11 is reduced. It has a layer 13. Further, in the electric motor 103, the first detector cover 10 and the second detector cover 11 are attached to the second bracket 6 by the metal screws 14.
  • the second detector cover 11 and the first detector cover 10 are fixed to the second bracket 6 by co-tightening with the metal screw 14.
  • the screw 14 for fixing the second detector cover 11 and the first detector cover 10 to the second bracket 6 is shared, so that the number of parts can be reduced and the man-hours for assembling the electric motor 103 can be reduced. Can be reduced.
  • the screw 14 used for joint tightening is made of metal, heat is easily transferred from the second bracket 6 to the second detector cover 11 via the screw 14, and the second bracket 6 The amount of heat transferred from the second detector cover 11 made of metal can be increased.
  • the location where the second detector cover 11 and the first detector cover 10 are fastened together with the screws 14 is not limited to the second bracket 6 shown in FIG. It may be a metal part of the body. Even when the location where the second detector cover 11 and the first detector cover 10 are fastened together with the screws 14 is the metal portion of the above-mentioned housing, the same as when fastening together with the second bracket 6. The effect can be obtained.
  • the electric motor 103 similarly to the electric motor 101 shown in FIG. 2, the electric motor 103 has a configuration in which a resin plate similar to the plate 12 of the electric motor 101 is inserted between the second bracket 6 and the detector 9. The amount of heat transferred from the bracket 6 to the detector 9 may be suppressed.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Motor Or Generator Frames (AREA)
PCT/JP2018/043830 2018-11-28 2018-11-28 電動機 WO2020110238A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
JP2019531490A JP6608098B1 (ja) 2018-11-28 2018-11-28 電動機
PCT/JP2018/043830 WO2020110238A1 (ja) 2018-11-28 2018-11-28 電動機
KR1020217010303A KR102256362B1 (ko) 2018-11-28 2018-11-28 전동기
CN201880099708.3A CN113169628B (zh) 2018-11-28 2018-11-28 电动机

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2018/043830 WO2020110238A1 (ja) 2018-11-28 2018-11-28 電動機

Publications (1)

Publication Number Publication Date
WO2020110238A1 true WO2020110238A1 (ja) 2020-06-04

Family

ID=68613363

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2018/043830 WO2020110238A1 (ja) 2018-11-28 2018-11-28 電動機

Country Status (4)

Country Link
JP (1) JP6608098B1 (zh)
KR (1) KR102256362B1 (zh)
CN (1) CN113169628B (zh)
WO (1) WO2020110238A1 (zh)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220118084A (ko) * 2021-02-18 2022-08-25 (주)로텍 베어링 냉각구조를 구비한 모터

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0222055U (zh) * 1988-07-26 1990-02-14
JP2010041914A (ja) * 2008-07-07 2010-02-18 Yaskawa Electric Corp エンコーダ付モータ
JP2010104220A (ja) * 2008-09-29 2010-05-06 Sanyo Denki Co Ltd モールドモータ
JP2015073370A (ja) * 2013-10-03 2015-04-16 日産自動車株式会社 駆動ユニットおよび駆動ユニットの組付方法
JP2016226090A (ja) * 2015-05-27 2016-12-28 オークマ株式会社 エンコーダ内蔵モータ

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08196058A (ja) * 1995-01-11 1996-07-30 Yaskawa Electric Corp 回転検出器付き回転電機
JP2010051141A (ja) * 2008-08-25 2010-03-04 Panasonic Corp 位置検出器付モータ
JP2016025814A (ja) * 2014-07-24 2016-02-08 株式会社安川電機 回転電機
JP2018082553A (ja) * 2016-11-16 2018-05-24 日本電産サンキョー株式会社 モータ

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0222055U (zh) * 1988-07-26 1990-02-14
JP2010041914A (ja) * 2008-07-07 2010-02-18 Yaskawa Electric Corp エンコーダ付モータ
JP2010104220A (ja) * 2008-09-29 2010-05-06 Sanyo Denki Co Ltd モールドモータ
JP2015073370A (ja) * 2013-10-03 2015-04-16 日産自動車株式会社 駆動ユニットおよび駆動ユニットの組付方法
JP2016226090A (ja) * 2015-05-27 2016-12-28 オークマ株式会社 エンコーダ内蔵モータ

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220118084A (ko) * 2021-02-18 2022-08-25 (주)로텍 베어링 냉각구조를 구비한 모터
KR102623355B1 (ko) 2021-02-18 2024-01-11 주식회사 로텍 베어링 냉각구조를 구비한 모터

Also Published As

Publication number Publication date
JPWO2020110238A1 (ja) 2021-02-15
CN113169628A (zh) 2021-07-23
KR20210043716A (ko) 2021-04-21
JP6608098B1 (ja) 2019-11-20
CN113169628B (zh) 2022-10-14
KR102256362B1 (ko) 2021-05-27

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