US20040136842A1 - Fan motor - Google Patents

Fan motor Download PDF

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Publication number
US20040136842A1
US20040136842A1 US10/612,275 US61227503A US2004136842A1 US 20040136842 A1 US20040136842 A1 US 20040136842A1 US 61227503 A US61227503 A US 61227503A US 2004136842 A1 US2004136842 A1 US 2004136842A1
Authority
US
United States
Prior art keywords
bearing
bearing housing
rotational shaft
base
retainer cap
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
US10/612,275
Other languages
English (en)
Inventor
Rikuro Obara
Kaoru Matsumoto
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.)
Minebea Co Ltd
Original Assignee
Minebea Co 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 Minebea Co Ltd filed Critical Minebea Co Ltd
Publication of US20040136842A1 publication Critical patent/US20040136842A1/en
Assigned to MINEBEA CO., LTD. reassignment MINEBEA CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OBARA, RIKURO, MATSUMOTO, KAROU
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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/057—Bearings hydrostatic; hydrodynamic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/05—Shafts or bearings, or assemblies thereof, specially adapted for elastic fluid pumps
    • F04D29/056—Bearings
    • F04D29/059—Roller bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C21/00—Combinations of sliding-contact bearings with ball or roller bearings, for exclusively rotary movement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • 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
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/124—Sealing of shafts
    • 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
    • H02K7/08—Structural association with bearings
    • H02K7/085—Structural association with bearings radially supporting the rotary shaft at only one end of the rotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2360/00—Engines or pumps
    • F16C2360/46—Fans, e.g. ventilators
    • 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
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/167—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings
    • H02K5/1675—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using sliding-contact or spherical cap bearings radially supporting the rotary shaft at only one end of the rotor
    • 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
    • H02K5/16—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields
    • H02K5/173—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings
    • H02K5/1735—Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields using bearings with rolling contact, e.g. ball bearings radially supporting the rotary shaft at only one end of the rotor

Definitions

  • the present invention relates to an apparatus for a fan motor used in the cooling of equipment and the like containing electronic parts.
  • compact fan motors are installed for the purposes of cooling the interior of the assembly or the individual electronic parts.
  • FIG. 11 One example of this type of conventional axial flow fan motor that is installed in such equipment and the like is explained with reference to FIG. 11.
  • a ball bearing 5 and a sleeve bearing 6 are set inside a cylindrical bearing housing 4 that is integrally formed with base 3 of casing 2 made of synthetic resin, and the shaft 7 is supported by these bearings 5 and 6 so as to be capable of rotating.
  • ball bearing 5 is provided with a shield, while the sleeve bearing 6 consists of porous material of sintered metal or the like that is impregnated with lubricating oil.
  • the rotor 8 of the motor is attached to the tip of shaft 7
  • stator 9 of the motor is fixed to the periphery of bearing housing 4 opposite rotor 8
  • An impeller 11 made of synthetic resin and furnished with multiple fins 10 fits into the outer side of rotor 8
  • a PC board (print substrate) 12 incorporating a drive circuit that serves to drive the motor is attached to the periphery of the base of bearing housing 4 .
  • reference numeral 13 is the stop ring that prevents shaft 7 from coming off
  • 14 is the lead wire that serves to energize the PC board 12 .
  • stator 9 when the drive circuit of PC board 12 is energized via lead wire 14 , stator 9 generates a magnetic field and causes rotor 8 to rotate, with the result that impeller 11 rotates and air flow occurs in a uniform direction inside casing 2 . Consequently, by installing fan motor 1 in the appropriate part of the electronic equipment, it is possible to cool the individual electronic parts or the interior of the assembly of the electronic equipment.
  • the present invention is directed to the construction and operation of a fan motor that not only makes the ball bearing shield unnecessary, but also achieves a longer life for the ball bearing.
  • the construction of the fan motor is such that it is provided with a cylindrical bearing housing fixed to a base, a pair of bearings set inside the bearing housing, a rotational shaft supported by the pair of bearings, a stator fixed to the outer periphery of the bearing housing, a rotor that faces the stator and that is fixed to the side of the rotational shaft, and an impeller that is fixed to the side of the rotational shaft.
  • An embodiment of the present invention is characterized by shielding the interior of the bearing housing by forming a shield part at one end of the bearing housing that extends in the radial direction to the vicinity of the rotational shaft, setting the pair of bearings inside the bearing housing from the other end of the bearing housing, and affixing a cap member to the other end of the bearing housing.
  • the interior of the bearing housing is shielded by the shield part and the cap member.
  • This allows for effective dust-proofing of the interior of the housing and the bearings, prevention of splashing of lubricating oil, and allows for use of a bearing without a shield.
  • the pair of bearings is respectively fixed in place by contacting the shield part and the cap member.
  • One can also easily assure the concentricity of the pair of bearings by means of a structure that has the pair of bearings fit into the interior of the housing from one direction.
  • lubricating oil passes back and forth between the pair of bearings.
  • the fan motor is characterized by the fact that the pair of bearings can be either an unshielded ball bearing and a sleeve bearing, or a shielded ball bearing and a sleeve bearing.
  • FIG. 1 is a longitudinal section view of the fan motor according to a first embodiment of the present invention.
  • FIG. 2 is a longitudinal section view of the fan motor according to a second embodiment of the present invention.
  • FIG. 3 is a longitudinal section view of the fan motor according to a third embodiment of the present invention.
  • FIG. 4 is a longitudinal section view of the fan motor according to a fourth embodiment of the present invention.
  • FIG. 5 is a frontal view of the spacer of the fan motor shown in FIG. 1.
  • FIG. 6 is a cross-sectional view along line A-A of the spacer shown in FIG. 5.
  • FIG. 7 is an enlarged longitudinal section view of the sleeve bearing of the fan motor shown in FIG. 1.
  • FIG. 8 is an enlarged longitudinal section view of a modified example of the sleeve bearing of the fan motor shown in FIG. 1.
  • FIG. 9 is an enlarged longitudinal section view of the retainer cap of the fan motor shown in FIG. 2.
  • FIG. 10 is a frontal view of the retainer cap shown in FIG. 9.
  • FIG. 11 is a longitudinal section view of a conventional fan motor according to the prior art.
  • fan motor 20 is provided with a synthetic resin casing 25 having a cylindrical venturi part 21 that has a tapered inner surface, a base 23 that is fixed in place by multiple ribs 22 radially extending at the center of one end of venturi part 21 , and a cylindrically-shaped bearing housing 24 that is integrally molded with the bottomed base 23 .
  • the bearing housing 24 extends from base 23 into the interior of casing 25 in a manner concentric with venturi part 21 .
  • a bottom shield part 26 having formed therein an aperture 26 A at the center.
  • the shield part 26 extends radially to the vicinity of rotational shaft 31 .
  • a cylindrical part 45 formed at a base of hub 33 , that is attached to the tip of rotational shaft 31 .
  • a sufficiently, small clearance gap of 30-50 ⁇ m is formed between cylindrical part 45 and aperture 26 A.
  • bearing housing 24 Inside bearing housing 24 , ball bearing 27 , that contacts shield part 26 , and cylindrical spacer 28 , that contacts both ball bearing 27 and sleeve bearing 29 , are inserted via an aperture in the side of base 23 and set in place.
  • the bottomed, cylindrically-shaped retainer cap 30 is then pressed into the aperture in the side of base 23 of bearing housing 24 , and contacts sleeve bearing 29 , fixing in place ball bearing 27 , spacer 28 , and sleeve bearing 29 .
  • the interior of bearing housing 24 is shielded from the exterior at each respective end by shield part 26 and retainer cap 30 .
  • ball bearing 27 one may use an unshielded ball bearing that is not provided with a shield.
  • multiple oil grooves 46 are provided in the axial direction on the outer periphery (four are illustrated in the figures), and multiple oil grooves 47 are respectively formed in the radial direction on both end faces (four are illustrated in the figures). It is to be understood, of course, that more or less oil grooves may be used depending on specifications.
  • the sleeve bearing 29 consists of porous material made of sintered metal or the like, and is impregnated with lubricating oil.
  • the end of sleeve bearing 29 on the retainer cap 30 side is sealed, or the density of the sintering may be raised so that the lubricating oil that impregnates sleeve bearing 29 does not flow out to retainer cap 30 side.
  • a chamfer 48 or a stage 49 can be formed on an edge of sleeve bearing 29 aperture on the ball bearing 27 side that allows for easy insertion of rotational shaft 31 .
  • the rotational shaft 31 is inserted through ball bearing 27 and sleeve bearing 29 , and is supported thereby so that it is capable of rotating.
  • a stop ring 32 is attached to rotational shaft 31 , and rotational shaft 31 is locked in place by the contact of stop ring 32 with ball bearing 27 .
  • a hub 33 made of zinc die cast, is attached to the tip of rotational shaft 31 , and additionally a rotor 34 is attached to hub 33 .
  • the rotor 34 covers bearing housing 24 and consists of a bottomed, cylindrically-shaped yoke 35 , whose bottom part is attached to hub 33 , and an annular permanent magnet 36 fixed to the inner periphery of yoke 35 .
  • An impeller 38 possessing multiple fins 37 is press-fitted into the outer periphery of yoke 35 .
  • a stator 39 that faces the inner periphery of rotor 34 is attached to the outer periphery of bearing housing 24 .
  • the stator 39 consists of a core 40 that radially extends facing the inner periphery of permanent magnet 36 of the rotor 34 side, a bobbin 41 mounted on core 40 , a coil 42 that is wound around bobbin 41 , and a PC board 43 that is fixed to bobbin 41 and that is arranged at the periphery of the base of bearing housing 24 .
  • the central part in the axial direction of permanent magnet 36 is offset to the side of base 23 relative to the central part in the axial direction of core 40 .
  • the brushless DC motor consists of rotor 34 and stator 39 , and a drive circuit is provided in PC board 43 for purposes of driving the pertinent brushless DC motor.
  • a lead wire 44 is connected to PC board 43 in order to energize the drive circuit.
  • the lead wire 44 is arranged so as to pass along one of the ribs 22 , and extends to the exterior of casing 25 .
  • the drive circuit mounted in PC board 43 controls the current that flows to coil 42 , sequentially magnetizes core 40 , and rotates rotor 34 in a uniform direction.
  • impeller 38 is rotated in a uniform direction, and it is possible to blow air in a uniform direction corresponding to its rotation.
  • bearing housing 24 is configured so that ball bearing 27 and sleeve bearing 29 are inserted and set from the aperture in the side of base 23 , their fitting parts can be molded/cast from one metal die (i.e., without the need for an upper die and a lower die) without occurrence of undercutting. Consequently, it is possible to easily assure the concentricity of ball bearing 27 and sleeve bearing 29 .
  • FIG. 2 a second embodiment of the present invention is described.
  • the second embodiment has largely the same configuration as the above-described first embodiment, except that it is provided with a spring-action preloading mechanism for the ball bearing, the parts that are identical to those in the first embodiment are hereinafter given the same reference numerals and a detailed explanation is given only for the parts that are different.
  • rotational shaft 31 As shown in FIG. 2, in the fan motor 50 pertaining to the second embodiment, rotational shaft 31 , towards the base 23 , is formed as a spherically-shaped surface part 51 and a slide member 52 is installed so as to be able to slide inside retainer cap 30 and to contact this spherical part 51 .
  • a slide member 52 By means of the spring force of coil spring 53 that is interposed between slide member 52 and retainer cap 30 , rotational shaft 31 is pressed in the direction away from base 23 , and ball bearing 27 is preloaded.
  • a slipper 54 made of synthetic resin is provided in order to alleviate friction.
  • retainer cap 30 also serves the additional function of receiving the spring action of coil spring 53 , as shown in FIG. 9 and FIG. 10, engagement claws 55 are formed at both ends of retainer cap 30 in the radial direction.
  • the engagement claws 55 engage by snapping onto base 23 , and in addition to securing ball bearing 27 , spacer 28 and sleeve bearing 29 , they support the spring force of coil spring 53 .
  • FIG. 3 a third embodiment of the present invention is described.
  • the third embodiment has largely the same configuration as the above-described first and second, embodiments, except that the ball bearing and sleeve bearing are arranged in the opposite manner with omission of the spacer, the parts that are identical to those of the above-described embodiments are hereinafter given the same reference numerals and a detailed explanation is given only for the parts that are different.
  • bearing 29 is press-fitted into bearing housing 24 and contacts shield part 26 .
  • the ball bearing 27 fits into the somewhat larger diameter aperture side of the bearing housing and is fixed in place as one end contacts stage 57 while the other end contacts retainer cap 30 .
  • a stop-ring 32 is attached to the base of spherical part 51 , and contacts ball bearing 27 .
  • FIG. 4 a fourth embodiment of the present invention is described.
  • the fourth embodiment has largely the same configuration as the above-described first embodiment, except that the direction of the preloading due to the magnetic field of the stator is reversed and the attachment positions of the permanent magnet of the rotor and stop-ring of the shaft are different, the parts that are identical to those of the above-described first embodiment are hereinafter given the same reference numerals and a detailed explanation is given only for the parts that are different.
  • the permanent magnet 36 of rotor 34 extends in the axial direction to the vicinity of the bottom part of yoke 35 , and its central part in the axial direction is offset to the opposite side of base 23 relative to the central part in the axial direction of the stator 39 .
  • the description concerns a configuration that uses a ball bearing and a sleeve bearing as a pair of bearings, however, it is to be understood that this invention is not limited thereto, and that it is possible to have both be ball bearings or sleeve bearings, and/or to use other suitable types of bearings.
  • the present invention is described in the context of a fan motor, however, it is also to be understood that the present invention is not limited thereto, and can be similarly applied to blowers with larger pressure ratios than fan motors.
  • fan motor employed in this specification shall also be taken to include those blowers with larger pressure ratios.
  • the configuration of the fan motor is such that the pair of bearings can be set inside the bearing house from one side, it is possible to mold the bearing fitting parts of the bearing housing from one metal die, and thus the concentricity of the pair of bearings can be easily assured.
  • the bearing housing with a shield part and a retainer cap, the pair of bearings can be retained in place in the bearing housing by contact with the shield part and the retainer cap.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Motor Or Generator Frames (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
US10/612,275 2002-07-04 2003-07-02 Fan motor Abandoned US20040136842A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2002-195748 2002-07-04
JP2002195748A JP2004040926A (ja) 2002-07-04 2002-07-04 ファンモータ

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US20040136842A1 true US20040136842A1 (en) 2004-07-15

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US (1) US20040136842A1 (enExample)
EP (1) EP1378983A3 (enExample)
JP (1) JP2004040926A (enExample)
CN (1) CN1484357A (enExample)
TW (1) TWI232020B (enExample)

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US20070182261A1 (en) * 2006-02-03 2007-08-09 Nils Rapp Electronically commutated motor
US20070183907A1 (en) * 2006-02-03 2007-08-09 Boris Serowy Electronically commutated motor with bearing chamber defined by opposing abutment surfaces
US20070286749A1 (en) * 2006-05-16 2007-12-13 Pfeiffer Vacuum Gmbh Drive for vacuum pump
US20080232983A1 (en) * 2007-03-23 2008-09-25 Nidec Corporation Motor, fan and manufacturing method of the same
US20080292479A1 (en) * 2007-05-25 2008-11-27 Foxconn Technology Co., Ltd. Cooling fan
US20090047148A1 (en) * 2007-08-15 2009-02-19 Delta Electronics, Inc. Fan and bearing bracket thereof
US20090110339A1 (en) * 2005-09-27 2009-04-30 Kenji Hibi Bearing Device with Sliding Bearing
US20090196773A1 (en) * 2008-02-05 2009-08-06 Delta Electronics, Inc Fan and motor
US20090220360A1 (en) * 2008-02-29 2009-09-03 Fu Zhun Precision Industry (Shen Zhen) Co., Ltd. Cooling fan
US20090246042A1 (en) * 2008-03-31 2009-10-01 Nidec Sankyo Corporation Fan motor
US20100215527A1 (en) * 2009-02-25 2010-08-26 Minebea Co., Ltd. Fan apparatus
US20100225182A1 (en) * 2009-03-04 2010-09-09 Sanyo Denki Co., Ltd. Electric fan
CN102377274A (zh) * 2010-08-09 2012-03-14 日本电产株式会社 主轴马达及盘驱动装置
CN102377275A (zh) * 2010-08-09 2012-03-14 日本电产株式会社 主轴马达及盘驱动装置
US20120107156A1 (en) * 2010-11-02 2012-05-03 Nidec Corporation Blower fan
US8598823B2 (en) 2007-10-10 2013-12-03 Prime Datum, Inc. Integrated fan drive system for cooling tower
US8629640B2 (en) 2008-03-24 2014-01-14 Prime Datum, Inc. Integrated fan drive system for air-cooled heat exchangers (ACHE)
US20140246936A1 (en) * 2011-11-08 2014-09-04 New Motech Co., Ltd. Fan motor
CN104564732A (zh) * 2013-10-23 2015-04-29 台达电子工业股份有限公司 薄型风扇
US20150226225A1 (en) * 2014-02-08 2015-08-13 Nidec Corporation Fan motor
US20180195531A1 (en) * 2017-01-08 2018-07-12 Asia Vital Components Co., Ltd. Vibration damper structure and fan thereof
US10215231B2 (en) * 2017-06-26 2019-02-26 Asia Vital Components Co., Ltd. Bearing structure with close fit
US20190226522A1 (en) * 2016-11-04 2019-07-25 Delta Electronics, Inc. Motor having shock-proof design
EP3490114A4 (en) * 2016-07-19 2020-02-19 LG Innotek Co., Ltd. FAN MOTOR AND VEHICLE WITH IT
US10680487B2 (en) 2017-03-24 2020-06-09 Nidec Corporation Stator unit, motor, and fan motor
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US20110204734A1 (en) 2005-06-25 2011-08-25 Orlowski David C Motor Grounding Seal
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DE112006002849T5 (de) 2005-10-21 2008-09-25 Kabushiki Kaisha Yaskawa Denki, Kitakyushu Zylindrischer Linearmotor
TWI280322B (en) * 2005-12-23 2007-05-01 Delta Electronics Inc Fan and motor thereof
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JP2007221921A (ja) * 2006-02-16 2007-08-30 Nippon Densan Corp 電動モータ及びファンユニット
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TWI497880B (zh) * 2013-08-16 2015-08-21 Sunonwealth Electr Mach Ind Co Motor and its motor bearing structure
CN107171476A (zh) * 2017-05-15 2017-09-15 张志通 一种密封式电机
FR3075103B1 (fr) * 2017-12-20 2019-11-22 Aktiebolaget Skf Dispositif de butee de suspension et jambe de force equipee d’un tel dispositif
JP7318208B2 (ja) * 2019-01-09 2023-08-01 ニデック株式会社 モータ、送風装置、および、掃除機
DE102019125063A1 (de) * 2019-09-18 2021-03-18 Minebea Mitsumi Inc. Elektromotor
US11757330B2 (en) 2019-12-19 2023-09-12 Black & Decker, Inc. Canned outer-rotor brushless motor for a power tool
US11437900B2 (en) 2019-12-19 2022-09-06 Black & Decker Inc. Modular outer-rotor brushless motor for a power tool
WO2021151985A1 (en) 2020-01-30 2021-08-05 Ngi A/S Hygenic sealing for bearing house
CN112672628B (zh) * 2020-12-30 2023-03-10 西安开容电子技术有限责任公司 一种转动机构的屏蔽装置
US12176794B2 (en) 2021-11-19 2024-12-24 Black & Decker Inc. Outer-rotor brushless motor for a power tool
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CN1484357A (zh) 2004-03-24
TWI232020B (en) 2005-05-01

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