US20140369821A1 - Earth and/or sealing assembly for electric motors - Google Patents

Earth and/or sealing assembly for electric motors Download PDF

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Publication number
US20140369821A1
US20140369821A1 US14/366,856 US201214366856A US2014369821A1 US 20140369821 A1 US20140369821 A1 US 20140369821A1 US 201214366856 A US201214366856 A US 201214366856A US 2014369821 A1 US2014369821 A1 US 2014369821A1
Authority
US
United States
Prior art keywords
slinger
cover
sealing assembly
shaft
chamber
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
US14/366,856
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English (en)
Inventor
Peter Finck
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.)
POPE ELECTRIC MOTORS Pty Ltd
Original Assignee
POPE ELECTRIC MOTORS Pty 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
Priority claimed from AU2011905348A external-priority patent/AU2011905348A0/en
Application filed by POPE ELECTRIC MOTORS Pty Ltd filed Critical POPE ELECTRIC MOTORS Pty Ltd
Assigned to POPE ELECTRIC MOTORS PTY LTD reassignment POPE ELECTRIC MOTORS PTY LTD ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FINCK, Peter
Publication of US20140369821A1 publication Critical patent/US20140369821A1/en
Abandoned legal-status Critical Current

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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
    • H02K5/10—Casings or enclosures characterised by the shape, form or construction thereof with arrangements for protection from ingress, e.g. water or fingers
    • 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
    • F01D11/00—Preventing or minimising internal leakage of working-fluid, e.g. between stages
    • F01D11/02—Preventing or minimising internal leakage of working-fluid, e.g. between stages by non-contact sealings, e.g. of labyrinth type
    • 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
    • H02K11/40—Structural association with grounding devices
    • 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

Definitions

  • the present invention relates to a shaft earth and/or sealing assembly for use with rotating equipment such as electric motors.
  • VFDs variable frequency drives
  • VFDs regulate the speed of a motor by converting sinusoidal line alternating current (AC) voltage to direct current (DC) voltage, then back to a pulse width modulated (PWM) AC voltage of variable frequency.
  • the switching frequency of these pulses ranges from 1 kHz up to 20 kHz and is referred to as the “carrier frequency.”
  • the ratio of change in voltage to the change in time creates what has been described as a parasitic capacitance between the motor stator and the rotor, which induces a voltage on the rotor shaft. If the voltage induced on the shaft, referred to as “common mode voltage” or “shaft voltage,” builds up to a sufficient level, it can discharge to ground through the bearings. Current that finds its way to ground through the motor bearings in this manner is called “bearing current”.
  • bearing current There are many causes of bearing current including voltage pulse overshoot in the VFD, non-symmetry of the motor's magnetic circuit, supply imbalances, and transient conditions, among other causes. Any of these conditions can occur independently or simultaneously to create bearing currents in the motor shaft.
  • the present invention provides an earth assembly for an electric motor having a rotatable drive shaft, a housing and a bearing journalled about said shaft at at least one end thereof, said earth assembly characterised by:
  • said electrically conductive material is a sacrificial portion of an earth brush that is spring biased against said slinger surface.
  • said slinger cover includes a socket extending from an exterior of said slinger cover to inside said chamber, said earth brush being shaped for insertion into said socket and said socket being positioned such that when the earth brush is inserted, the sacrificial portion contacts said slinger surface.
  • said socket includes an internal thread and said earth brush includes a screw head having an external thread configured to engage the internal thread, the sacrificial portion being spaced from the screw head by a compression spring that biases said sacrificial portion towards said surface.
  • the assembly further includes a wear indicator configured to indicate to an operator when the earth brush sacrificial portion is worn to a predetermined level.
  • said electrically conductive material further includes electrically conductive lubricant which fills said chamber.
  • said electrically conductive material is conductive lubricant which fills said chamber.
  • the slinger and slinger cover include axially extending, close tolerance surfaces forming a labyrinth between an exterior of said slinger and bearing covers and inside said chamber.
  • the present invention provides an electric motor including an earth assembly as characterised in paras. [007] to [014].
  • the present invention provides a sealing assembly for an electric motor having a rotatable drive shaft, a housing and at least one bearing, said sealing assembly including:
  • said close tolerance labyrinth surfaces includes an inner surface of the slinger cover adjacent the shaft including an axially extending, annular male portion and two annular female portions on either side thereof.
  • said close tolerance labyrinth surfaces includes an outer surface of the slinger adjacent the shaft including two axially extending male portions and one female portion there between.
  • the male portion of the slinger cover is adapted to extend inside the female portion of the slinger, and the male portions of the slinger extend inside the two female portions of the cover.
  • said chamber includes a portion in which an electrically conductive material is accommodated to enable contact between said electrically conductive material and a surface of the slinger.
  • said electrically conductive material is a sacrificial portion of an earth brush that is spring biased against said slinger surface, the slinger cover including a socket extending from an exterior of said slinger cover to inside said chamber, said earth brush being shaped for insertion into said socket and said socket being positioned such that when the earth brush is inserted, the sacrificial portion contacts one of said slinger male portions.
  • the invention provides an electric motor including a sealing assembly as characterised in any one of paras. [016] to [021].
  • the present invention provides an earth and sealing assembly for an electric motor having a rotatable drive shaft, a housing, and a bearing journalled about said shaft at at least one end thereof, said earth assembly characterised by:
  • the invention provides an electric motor including an earth and sealing assembly as characterised in para. [023].
  • FIG. 1 illustrates a front, exploded perspective view of an electric motor and a shaft earth and/or sealing assembly in accordance with an embodiment of the present invention
  • FIG. 2 illustrates a rear, exploded perspective view of the electric motor and shaft earth and/or sealing assembly of FIG. 1 ;
  • FIG. 3 illustrates an enlarged cross sectional view of a shaft earth and/or sealing assembly according to an embodiment associated with an end of the electric motor, the cross sectional view taken along the motor's longitudinal axis.
  • the present invention relates, in one aspect, to a shaft earth and/or sealing assembly 10 which in an embodiment can be incorporated into an electric motor 12 .
  • the invention relates, in another aspect, to an electric motor 12 incorporating a shaft earth and/or sealing assembly 10 .
  • FIGS. 1 and 2 there is shown an electric motor 12 according to an embodiment including a cylindrical outer housing 14 with cooling fins 16 , a rotatable drive shaft 18 , and a shaft earth and/or sealing assembly 10 associated with at least one end of the motor which in FIGS. 1 and 2 is shown in an exploded form. It is to be understood at the outset that the invention is not intended to be limited to use of only one assembly 10 at one end of the motor 12 .
  • the electric motor includes a shaft earth and/or sealing assembly 10 associated with bearings 20 at both ends. It is to be further understood that the internal components of the electric motor are considered to be known to those skilled in the art, and so these components are not described in detail herein.
  • FIG. 3 illustrates one end of a motor 12 according to an embodiment including the shaft 18 , a roller bearing 20 journalled around the shaft, an end shield 22 , and a roller bearing cap 24 , slinger 26 , and slinger cover 28 which all form part of a shaft earth and/or sealing assembly 10 according to an embodiment.
  • Each of the roller bearing 20 , end shield 22 , roller bearing cap 24 , slinger 26 , and slinger cover 28 include radial centres which are coaxial with the centre of the shaft 18 , but only the slinger 26 rotates therewith as will become apparent.
  • There are various other components which form part of the assembly 10 which are described in more detail below.
  • the end shield 22 includes an internal cavity 30 which ensures that grease placed into the cavity through capped opening 32 lubricates the roller bearing 20 at all times.
  • the grease path is indicated by arrows 34 , and it can be appreciated that grease also enters the internal cavity 36 of the bearing cap 24 through which it can be discharged via outlet 38 .
  • the bearing cap 24 includes V-ring seals 40 fitted for protection against ingress into the bearing cavity 26 of water, dust, solids, and also excess conductive lubricant which will be described in more detail below.
  • the invention is not intended to be limited to any one means of discharging grease from cavity 36 , for example, one could use an open chamber, a grease exhaust seal cover, a “split rubber” membrane, a grease chute, a grease trap and tray, a pneumatic cylinder discharge pump, or a spring loaded grease valve.
  • An advantage afforded by the present invention is that the motor 12 meets the IP-69K rating mentioned in the preamble, as well as being flame and spark proof. Aside from the various O-ring seals that are used, most of which are listed and described below, a mechanism for achieving this rating is the labyrinth created by close tolerance annular surfaces between the slinger 26 and slinger cover 28 .
  • the inner surface of the slinger cover 28 adjacent the central shaft 18 is shaped such that it includes an axially extending, annular male portion 42 and female portions 44 and 46 on either side thereof.
  • the outer surface of the slinger 26 adjacent the central shaft 18 is shaped such that it includes two axially extending, annular male portions 48 and 50 and one female annular portion 52 therebetween.
  • the male portion 42 of the slinger cover is adapted to extend inside the female portion 52 of the slinger, while the male portions 48 and 50 of the slinger 26 extend inside the two female portions 44 and 46 of the cover.
  • What is thus created is a labyrinth through which water, dust, etc, must travel before it can reach inside a lubricant chamber 54 inside the slinger cover 28 .
  • the intention is that no water and/or dust particles will be able to travel through this labyrinth into chamber 54 .
  • Shaft seal 58 to provide a first barrier against water and dust ingress
  • O-rings 64 for bearing cap bolts 66 which fasten the bearing cap 24 to the end shield 22 ;
  • the assembly 10 is also used to earth or ground the motor shaft 18 .
  • the reader is directed to the enlarged cross sectional view on the upper left of FIG. 3 .
  • an earth brush 72 according to an embodiment which is adapted to make contact at all times with a surface of male portion 48 of the slinger 26 .
  • the earth brush serves to ground the shaft 18 .
  • the earth brush 72 is biased against the slinger male portion 48 through use of a grub screw 74 and compression spring 76 adapted to provide bias to a brush holder screw 78 at the top of the earth brush 72 .
  • the bias provided by the spring will ensure contact is maintained.
  • the earth brush screw is accessible from outside the motor. Because the slinger 26 is rotating relative to the brush, the brush 72 will become worn and will require replacement at appropriate intervals throughout the life of the motor.
  • the slinger cover chamber 54 is adapted to be filled with conductive lubricant via a nipple (not shown).
  • the conductive lubricant provides an electrically conductive path for low voltage currents, to prevent harmful currents from discharging through the bearing to earth.
  • the slinger cover 28 may include a screw or spring loaded lubricant exhaust valve 80 to seal the conductive lubricant exhaust port 82 .
  • the present invention is not intended to be limited to the use of an earth brush to ground the shaft.
  • the earth brush and conductive lubricant used in combination in the embodiment shown could equally well be used independent of each other.
  • a conductive lubricant could be used with the brush.
  • the spring and grub screw configuration described above could form part of a one-piece elongate insert (not shown) including a housing adapted to hide and protect components such as springs and/or associated components.
  • earth brushes available in the market, including conventional friction type brushes to more evolved microfiber brushes, all of which could be implemented within the scope of the present invention.
  • the apparatus 10 includes a wear indicator (not shown) used to warn an operator when the earth brush is almost completely worn.
  • a wear indicator could be in the form of a microswitch (not shown) triggered when the brush is worn to a predetermined level.
  • the apparatus 10 may include other known components and mechanisms to improve its operation and/or performance.
  • the bearing housing is insulated 84 to isolate the bearing 20 from shaft currents.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Motor Or Generator Frames (AREA)
US14/366,856 2011-12-21 2012-12-19 Earth and/or sealing assembly for electric motors Abandoned US20140369821A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AU2011905348A AU2011905348A0 (en) 2011-12-21 Earth and sealing assembly for electric motors
AU2011905348 2011-12-21
PCT/AU2012/001561 WO2013090997A1 (fr) 2011-12-21 2012-12-19 Ensemble de mise à la terre et/ou d'étanchéité pour moteurs électriques

Publications (1)

Publication Number Publication Date
US20140369821A1 true US20140369821A1 (en) 2014-12-18

Family

ID=48667502

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/366,856 Abandoned US20140369821A1 (en) 2011-12-21 2012-12-19 Earth and/or sealing assembly for electric motors

Country Status (4)

Country Link
US (1) US20140369821A1 (fr)
CN (1) CN104205580A (fr)
AU (1) AU2012357713B2 (fr)
WO (1) WO2013090997A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170261107A1 (en) * 2016-03-10 2017-09-14 General Electric Company Seal ring assembly for a dynamoelectric machine
US20170353087A1 (en) * 2014-12-19 2017-12-07 Weg Equipamentos Eletricos S.A. System for grounding bearings of rotary electric machines, and corresponding electric machine
CN108566017A (zh) * 2018-06-30 2018-09-21 中山大洋电机股份有限公司 一种有效防止轴电流烧蚀轴承的电机
US20190157947A1 (en) * 2016-09-06 2019-05-23 Bayerische Motoren Werke Aktiengesellschaft Drive Device for a Motor Vehicle
CN112751443A (zh) * 2019-10-31 2021-05-04 中车株洲电力机车研究所有限公司 一种电机轴电压测试结构
WO2021170341A1 (fr) * 2020-02-26 2021-09-02 Voith Patent Gmbh Branchement à la terre destiné à une transmission
EP4372970A1 (fr) * 2022-11-15 2024-05-22 Abb Schweiz Ag Couvercle de ventilateur de moteur électrique, interface de cloche d'extrémité et porte-balais monté radialement

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2571486B (en) * 2016-12-14 2022-03-23 Dongfang Electric Machinery Co Ltd Full-path sealing structure of steam turbine generator and assembly method
CN106787374B (zh) * 2016-12-14 2018-10-26 东方电气集团东方电机有限公司 一种汽轮发电机全路径密封结构及装配方法
CN109302003A (zh) * 2017-07-24 2019-02-01 西门子（中国）有限公司 电机的驱动轴的接地装置及电机
CN109669121A (zh) * 2017-10-17 2019-04-23 株洲中车时代电气股份有限公司 一种轨道列车检测系统
FR3077949A1 (fr) * 2018-02-15 2019-08-16 Renault S.A.S Dispositif de mise a la masse d'un arbre tournant dans un carter et reducteur de vitesse
CN113541409B (zh) * 2020-04-10 2024-02-27 台达电子工业股份有限公司 马达
WO2023202913A1 (fr) 2022-04-22 2023-10-26 Basf Se Alcools alcoxylés destinés à augmenter la tension de claquage d'un lubrifiant

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US1978739A (en) * 1930-03-08 1934-10-30 Gen Motors Corp Seal or guard
US4603865A (en) * 1985-02-25 1986-08-05 General Motors Corporation Drive motor gear lubricant seal for locomotives and the like
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US5661356A (en) * 1993-10-22 1997-08-26 Fisher; Rodney R. Motor shaft discharge device
US6343794B1 (en) * 1999-10-01 2002-02-05 Donald J. Brown Lubricant seal having partition plate with gutter for drive motor gears and the like
US20030057783A1 (en) * 2001-09-27 2003-03-27 Melfi Michael J. System and method of reducing bearing voltage
US6617745B1 (en) * 1997-03-10 2003-09-09 Continental Teves Ag & Co.Ohg Engine pump unit
US20040233592A1 (en) * 2003-03-17 2004-11-25 Oh Hieyoung W. Grounding brush for mitigating electrical current on motor shafts
US20050029895A1 (en) * 2002-10-15 2005-02-10 Philippe Neidhart High-power direct current engine comprising a collector and carbon brushes for a racing car serving as prototype
JP2006234093A (ja) * 2005-02-25 2006-09-07 Nsk Ltd 車輪支持用転がり軸受装置
US20070138748A1 (en) * 2005-06-25 2007-06-21 Orlowski David C Motor ground seal
US20070222327A1 (en) * 2006-03-21 2007-09-27 Taiwan Long Hawn Enterprise Co Rear cover of motor
US20080258576A1 (en) * 2007-04-23 2008-10-23 Oh Hieyoung W Grounding brush system for mitigating electrical current on rotating shafts
US20110129176A1 (en) * 2008-07-08 2011-06-02 Yutaka Koma Axle bearing system

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JPH0755012A (ja) * 1993-08-12 1995-03-03 Fanuc Ltd 電動モータの軸封装置
JP3334276B2 (ja) * 1993-09-24 2002-10-15 富士通株式会社 磁気ディスク装置
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US5735615A (en) * 1996-10-04 1998-04-07 Reliance Electric Industrial Company Insulation arrangement for electrical machine shaft bearing
US6247702B1 (en) * 1999-05-19 2001-06-19 A. O. Smith Corporation Bearing shaft seal
CN100536285C (zh) * 2003-10-06 2009-09-02 伊利诺斯器械工程公司 用于缓和马达轴上的电流的接地刷
CN201238228Y (zh) * 2008-07-11 2009-05-13 鲍文光 电动车用电机的旋转密封机构

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1978739A (en) * 1930-03-08 1934-10-30 Gen Motors Corp Seal or guard
US4603865A (en) * 1985-02-25 1986-08-05 General Motors Corporation Drive motor gear lubricant seal for locomotives and the like
US5326235A (en) * 1991-02-21 1994-07-05 Swf Auto-Electric Gmbh Electric motor with attached pump
US5661356A (en) * 1993-10-22 1997-08-26 Fisher; Rodney R. Motor shaft discharge device
US6617745B1 (en) * 1997-03-10 2003-09-09 Continental Teves Ag & Co.Ohg Engine pump unit
US6343794B1 (en) * 1999-10-01 2002-02-05 Donald J. Brown Lubricant seal having partition plate with gutter for drive motor gears and the like
US20030057783A1 (en) * 2001-09-27 2003-03-27 Melfi Michael J. System and method of reducing bearing voltage
US20050029895A1 (en) * 2002-10-15 2005-02-10 Philippe Neidhart High-power direct current engine comprising a collector and carbon brushes for a racing car serving as prototype
US20040233592A1 (en) * 2003-03-17 2004-11-25 Oh Hieyoung W. Grounding brush for mitigating electrical current on motor shafts
JP2006234093A (ja) * 2005-02-25 2006-09-07 Nsk Ltd 車輪支持用転がり軸受装置
US20070138748A1 (en) * 2005-06-25 2007-06-21 Orlowski David C Motor ground seal
US20070222327A1 (en) * 2006-03-21 2007-09-27 Taiwan Long Hawn Enterprise Co Rear cover of motor
US20080258576A1 (en) * 2007-04-23 2008-10-23 Oh Hieyoung W Grounding brush system for mitigating electrical current on rotating shafts
US20110129176A1 (en) * 2008-07-08 2011-06-02 Yutaka Koma Axle bearing system

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* Cited by examiner, † Cited by third party
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Machine Translation of JP2006234093 *

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20170353087A1 (en) * 2014-12-19 2017-12-07 Weg Equipamentos Eletricos S.A. System for grounding bearings of rotary electric machines, and corresponding electric machine
US10644575B2 (en) * 2014-12-19 2020-05-05 Weg Equipamentos Eletricos S.A. System for grounding bearings of rotary electric machines, and corresponding electric machine
US20170261107A1 (en) * 2016-03-10 2017-09-14 General Electric Company Seal ring assembly for a dynamoelectric machine
US11162591B2 (en) * 2016-03-10 2021-11-02 General Electric Company Seal ring assembly for a dynamoelectric machine
US20190157947A1 (en) * 2016-09-06 2019-05-23 Bayerische Motoren Werke Aktiengesellschaft Drive Device for a Motor Vehicle
US10840779B2 (en) * 2016-09-06 2020-11-17 Bayerische Motoren Werke Aktiengesellschaft Drive device for a motor vehicle
CN108566017A (zh) * 2018-06-30 2018-09-21 中山大洋电机股份有限公司 一种有效防止轴电流烧蚀轴承的电机
CN112751443A (zh) * 2019-10-31 2021-05-04 中车株洲电力机车研究所有限公司 一种电机轴电压测试结构
WO2021170341A1 (fr) * 2020-02-26 2021-09-02 Voith Patent Gmbh Branchement à la terre destiné à une transmission
EP4372970A1 (fr) * 2022-11-15 2024-05-22 Abb Schweiz Ag Couvercle de ventilateur de moteur électrique, interface de cloche d'extrémité et porte-balais monté radialement

Also Published As

Publication number Publication date
CN104205580A (zh) 2014-12-10
AU2012357713B2 (en) 2015-04-30
WO2013090997A1 (fr) 2013-06-27
AU2012357713A1 (en) 2014-07-10

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Legal Events

Date Code Title Description
AS Assignment

Owner name: POPE ELECTRIC MOTORS PTY LTD, AUSTRALIA

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:FINCK, PETER;REEL/FRAME:033139/0179

Effective date: 20140619

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION