US3229130A - Motors having an air-gap jacket in particular for central heating accelerators and other like applications - Google Patents

Motors having an air-gap jacket in particular for central heating accelerators and other like applications Download PDF

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Publication number
US3229130A
US3229130A US253867A US25386763A US3229130A US 3229130 A US3229130 A US 3229130A US 253867 A US253867 A US 253867A US 25386763 A US25386763 A US 25386763A US 3229130 A US3229130 A US 3229130A
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United States
Prior art keywords
jacket
motor
air
fluid
gap
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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.)
Expired - Lifetime
Application number
US253867A
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English (en)
Inventor
Drouard Jean Louis Georges
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.)
Moteurs Drouard SA
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Individual
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Publication of US3229130A publication Critical patent/US3229130A/en
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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
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
    • C08B11/00—Preparation of cellulose ethers
    • C08B11/02—Alkyl or cycloalkyl ethers
    • C08B11/04—Alkyl or cycloalkyl ethers with substituted hydrocarbon radicals
    • 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
    • F04D13/0606—Canned motor pumps
    • F04D13/0613—Special connection between the rotor compartments

Definitions

  • the object of the invention is to provide an electric motor having an air-gap jacket in particular of utility in central heating accelerators and other like fluid circulating applications having the aforementioned drawbacks, such as circuits for circulating chemical products, oil for burners, and nuclear station circuits, this electric motor comprising a number of devices of known type which are so combined as to avoid the aforementioned drawbacks inherent in the present state of the art.
  • the air-gap jacket defines two cavities, one of which comprises the rotor and the other the stator .and the winding, the part of the inner cavity opposed to the pump communicates with the exterior only by way of a vent and the part of the inner cavity adjacent the pump communicates with the fluid driven by the pump through a filter having such dimensional characteristics as to filter'the fluid in the course of the first filling of said inner cavity while insuring the equilibrium of the pressures on both sides of said filter and on both sides of the bearing sleeve for the shaft of the motor, practically no circulation of fluid therefore occurring between said inner cavity and the exterior, the air gap and the thickness of the jacket being on account of the purity of the fluid reduced to the minimum values corresponding to the conditions of mechanical manufacture, the jacket being stiffened at its ends by flanges co- "ice operating with toric sealing elements mounted on the bearings and the case being provided, in contradistinction to the usual practice in this art, with cooling fins.
  • a thermic contact is provided between the winding and the case by replacing the air filling the stator cavity by a solid powdered material which is a better heat conductor than air, such asquartz, silica or the like, the whole being, if desired, subjected to a special impregnation for both mechanical and thermic reasons.
  • the single mechanical air gap does not exceed a value given in millimetres by the expression 0.2 mm.+D/500 in which D is expressed in millimetres and the thickness of the jacket does not exceed D/ 200.
  • the toric sealing means are disposed in recesses formed in the cylindrical faces of the bearings.
  • Said vent communicates with a de-gassing chamber with which communicates a blind hole formed in the end of the shaft of the motor opposed to the pump, this hole communicating with the inner cavity of the jacket by way of radialiholes.
  • FIG. 1 is a longitudinal sectional view of the motor according to the invention:
  • FIG. 1A shows a modification of a detail of the jacket.
  • FIG. 2 is a sectional view ofthe air-gap jacket.
  • FIG. .3 is a sectional view of the forward bearing of the motor
  • FIG. 4 is a sectional view-of the rear bearing of the motor.
  • FIG. 1 shows a stator 1 having a winding 2 and an air-gap jacket 3 having a generally circular tubular shape which fits in the bore of the stator.
  • a rotor 4 mounted on a shaft '5, there being a clearance or air gap 6 between the stator and rotor.
  • the shaft is supported by a rear bearing 7 and a forward bearing 8 provided with their sleeves 9 and 10' respectively.
  • the rear bearing is provided with a closing cap 11 defining between the cap and the shaft a chamber 12 performing the function of a de-gassing chamber with which communicates an axial blind hole 13 formed in the shaft of the motor, this hole communicating with the inner space of the motor by way of radial holes 14.
  • the inner wall of the bearing 8 is heat insulated by means of a heat insulator.
  • the forward bearing has a filter 21.
  • the air-gap jacket 3 (FIGS. 1 and 2) is composed of very thin stainless steel sheet, for example 0.2 mm. thick for a diameter of 40 mm. In order to insure that this jacket has suitable rigidity, it is provided at its ends with an outwardly extending flange 22 and an inwardly extending flange 23. These flanges also permit the easy disassembly of the jacket and the removal of the rear sealing element 15.
  • the inner flange 23 is formed by a forming over of the end of the Wall of the jacket 3 which can be formed over at 90 as shown in FIG. 1; preferably it is formed over at 180 as shown in FIG. 1A, which affords an improved stiffening of the jacket.
  • the filter 21 (FIG. 3) is constituted, for example, of a sintered metal pellet maintained in a chamber 24 formed in the bearing 8 forward of a chamber 25. The latter enables the fluid to flow to the interior of the motor through apertures 26 which communicate with a recess 27.
  • the section of the filter 21 and its porosity are so calculated that the pressure drop across the filter is less than that resulting from the clearance between the hearing sleeve 9 and the rotor shaft.
  • the filter 21, the chamber 24, the apertures 26 and the recess 27 are arranged as shown in the drawings and insure the maximum pas sage of fluid and thus permit satisfying the aforementioned condition.
  • the fluid in the annular clearance between the bearing sleeve 9 and the shaft is consequently fed round the rear of the bearing so as to ensure the lubrication. It is therefore a fluid devoid of dirt which performs this function.
  • This lubrication by means of a filtered fluid precludes any premature wear of the bearing sleeves.
  • the forward bearing 8 furthermore carries a fixed abutment 28 which contacts a moving abutment 29 connected to the rotor when, owing to the axial thrust of the pump, the rotor is biased in the direction of arrow F (FIG. 1).
  • This abutment 28 and the bearing sleeves are preferably composed of a conglomeration of sintered bronze encased in a mass of polytetrafiuorethylene (known under the trade name of Teflon), which permits an accidental operation in the dry condition.
  • FIG. 4 represents the detail of the rear bearing 7 and shows how it is possible to combine the known assembly of the sealing element 15 with the air-gap jacket 3 having the formed-over inner flange 23.
  • a cylindrical portion 30 of short length is provided forward of the groove 17, which serves as a housing for the sealing element 15,.
  • This cylindrical portion precludes any damage to the sealing element when assembling and prevents it from becoming pulled off inwardly of motor under the effect of the lateral thrust.
  • the diameter of this cylindrical portion is so calculated that the expansion of the sealing element is within the values indicated by the manufacturer whereas the diameter in the bottom of the groove 17 is within normal seal assembly limits.
  • the shaft 5 carries at the rear (FIG. 1) a shoulder 32 through the medium of which it abuts against the face of the rear bearing 7 when the motor is stationary and the static pressure of the fluid on the turbine of the pump urges the rotor rearwardly; this shoulder 32 thus performs the function of a valve.
  • the rear bearing is provided with a bleeder 33 which can be automatic or otherwise and puts the chamber 12 in communication with the atmosphere.
  • This machine is surrounded by a case 34 provided with outer cooling fins 35 which are shown in FIG. 1 to be circular but which could be longitudinal.
  • This case further comprises inner cooling fins 36. All these surfaces are painted a dark colour.
  • the motor operates in a reliable manner under the following conditions.
  • the inner wall of the bearing 8 can be insulated by means of a heat insulator.
  • the losses of the rotor are evacuated through the medium of the air-gap jacket and stator.
  • the main obstacle to the heat flux is the air gap.
  • the certainty that no impurity can enter the latter permits reducing it so far as mechanical construction permits, for example down to a value 0.2 mm.+D/500, in which D is the diameter of the jacket.
  • the small value of the thickness of the air-gap jacket facilitates this evacuation of heat.
  • the losses of the stator (and those transmitted thermically by the rotor) are easily evacuated owing to provision of the outer and inner fins on the case, the inner fins 36 more particularly contributing to the evacuation of the heat generated by the heads of the windings.
  • stator cavity is filled with a powdered solid material which is a better thermic conductor than air, such as quartz, silica or like material.
  • vent communicates with a de-gassing chamber which communicates with a blind hole formed in the shaft of the motor at the end thereof opposed to the pump, said blind hole communicating with the inner cavity of the jacket by way of radial holes.
  • bearing sleeves and abut-ments are composed of a conglomeration of sintered bronze encased in a mass of polytetrafluorethylene known under the trade name of Teflon.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Biochemistry (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Power Engineering (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Motor Or Generator Cooling System (AREA)
  • Non-Positive Displacement Air Blowers (AREA)
  • Motor Or Generator Frames (AREA)
US253867A 1962-02-02 1963-01-25 Motors having an air-gap jacket in particular for central heating accelerators and other like applications Expired - Lifetime US3229130A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR886814A FR1322867A (fr) 1962-02-02 1962-02-02 Perfectionnements aux moteurs à chemise d'entrefer, notamment pour accélérateurs de chauffage central et autres applications analogues

Publications (1)

Publication Number Publication Date
US3229130A true US3229130A (en) 1966-01-11

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ID=8771871

Family Applications (1)

Application Number Title Priority Date Filing Date
US253867A Expired - Lifetime US3229130A (en) 1962-02-02 1963-01-25 Motors having an air-gap jacket in particular for central heating accelerators and other like applications

Country Status (8)

Country Link
US (1) US3229130A (en:Method)
CH (1) CH394365A (en:Method)
DE (1) DE1887376U (en:Method)
FI (1) FI40776B (en:Method)
FR (1) FR1322867A (en:Method)
GB (1) GB969153A (en:Method)
LU (1) LU43078A1 (en:Method)
OA (1) OA00848A (en:Method)

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3487457A (en) * 1967-05-10 1969-12-30 Drouard Moteurs Electric motor having an airgap sleeve
US3521100A (en) * 1969-03-26 1970-07-21 Baldor Electric Co D.c. motor with cast main yoke and laminated interpole yoke and method of forming
US3733504A (en) * 1971-07-27 1973-05-15 Harowe Servo Controls Inc Self supporting rotary electrical device
US3740598A (en) * 1970-11-02 1973-06-19 Skf Ind Trading & Dev Electric motors or other electric rotary machines and method for the manufacture thereof
US4044274A (en) * 1974-07-19 1977-08-23 Stephan-Werke Gmbh & Co. Transmission system
US4415824A (en) * 1978-05-03 1983-11-15 Zschokke Wartmann Ag Stator casing for air-cooled electrical machines
US4486677A (en) * 1982-04-30 1984-12-04 Mitsubishi Denki Kabushiki Kaisha Encased electric motor employing gas as heat dissipating means
US4496862A (en) * 1983-08-05 1985-01-29 Sundstrand Corporation High speed generator air vent for air gap
WO1987004276A1 (en) * 1985-12-30 1987-07-16 Arends Gregory E Motor system
US5038088A (en) * 1985-12-30 1991-08-06 Arends Gregory E Stepper motor system
US6028380A (en) * 1995-09-05 2000-02-22 Abb Kraft As Arrangement in a bulb generator
US20030222525A1 (en) * 2000-10-17 2003-12-04 Minebea Co., Ltd. Rotor unit for an electromotor and an internal rotor electromotor
US20060163954A1 (en) * 2003-07-11 2006-07-27 Thales Cooling of a stator
US20060261686A1 (en) * 2005-05-17 2006-11-23 Parker-Hannifin Corporation Air-cooled electric motor
DE102008014379A1 (de) * 2008-03-17 2009-09-24 Sycotec Gmbh & Co. Kg Elektromechanische Maschine
CN102214971A (zh) * 2010-04-12 2011-10-12 哈米尔顿森德斯特兰德公司 电马达中的非金属屏障的实施
US20120049666A1 (en) * 2010-08-25 2012-03-01 Rudolph Garriga Systems and methods for providing fluid for internal cooling and lubrication of electric machines
US8427019B2 (en) 2010-08-25 2013-04-23 Clean Wave Technologies, Inc. Systems and methods for cooling and lubrication of electric machines
US20140294631A1 (en) * 2011-11-07 2014-10-02 Denso Corporation Water pump
US20160380514A1 (en) * 2015-02-23 2016-12-29 ALMOTT, Ltd. Brushless electrical machine with air cooling
US10314151B2 (en) * 2007-10-12 2019-06-04 Varex Imaging Corporation Charged particle accelerators, radiation sources, systems, and methods

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0773417B2 (ja) * 1990-07-13 1995-08-02 株式会社荏原製作所 キヤンドモータのステータ室
US5789833A (en) * 1995-11-24 1998-08-04 Kabushiki Kaisha Toshiba Totally-enclosed traction motor for electric railcar
US8920142B2 (en) * 2012-02-28 2014-12-30 Hamilton Sundstrand Corporation Wet rotor pump motor stator sealing liner
CN104214109B (zh) * 2013-06-03 2018-04-27 浙江三花制冷集团有限公司 一种循环泵

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Cited By (36)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3487457A (en) * 1967-05-10 1969-12-30 Drouard Moteurs Electric motor having an airgap sleeve
US3521100A (en) * 1969-03-26 1970-07-21 Baldor Electric Co D.c. motor with cast main yoke and laminated interpole yoke and method of forming
US3740598A (en) * 1970-11-02 1973-06-19 Skf Ind Trading & Dev Electric motors or other electric rotary machines and method for the manufacture thereof
US3733504A (en) * 1971-07-27 1973-05-15 Harowe Servo Controls Inc Self supporting rotary electrical device
US4044274A (en) * 1974-07-19 1977-08-23 Stephan-Werke Gmbh & Co. Transmission system
US4415824A (en) * 1978-05-03 1983-11-15 Zschokke Wartmann Ag Stator casing for air-cooled electrical machines
US4486677A (en) * 1982-04-30 1984-12-04 Mitsubishi Denki Kabushiki Kaisha Encased electric motor employing gas as heat dissipating means
WO1985000935A1 (en) * 1983-08-05 1985-02-28 Sundstrand Corporation High speed generator with air vent for air gap
US4496862A (en) * 1983-08-05 1985-01-29 Sundstrand Corporation High speed generator air vent for air gap
GB2154378A (en) * 1983-08-05 1985-09-04 Sunstrand Corp High speed generator with air vent for air cap
WO1987004276A1 (en) * 1985-12-30 1987-07-16 Arends Gregory E Motor system
US4779031A (en) * 1985-12-30 1988-10-18 Intellico, Inc. Motor system
US5038088A (en) * 1985-12-30 1991-08-06 Arends Gregory E Stepper motor system
US6028380A (en) * 1995-09-05 2000-02-22 Abb Kraft As Arrangement in a bulb generator
US20030222525A1 (en) * 2000-10-17 2003-12-04 Minebea Co., Ltd. Rotor unit for an electromotor and an internal rotor electromotor
US6946765B2 (en) * 2000-10-17 2005-09-20 Minebea Co., Ltd. Rotor unit for an electromotor and an internal rotor electromotor
US20060163954A1 (en) * 2003-07-11 2006-07-27 Thales Cooling of a stator
US7498711B2 (en) * 2003-07-11 2009-03-03 Thales Cooling of a stator
US7476992B2 (en) * 2005-05-17 2009-01-13 Parker-Hannifin Corporation Air-cooled electric motor
US20060261686A1 (en) * 2005-05-17 2006-11-23 Parker-Hannifin Corporation Air-cooled electric motor
US10314151B2 (en) * 2007-10-12 2019-06-04 Varex Imaging Corporation Charged particle accelerators, radiation sources, systems, and methods
DE102008014379A1 (de) * 2008-03-17 2009-09-24 Sycotec Gmbh & Co. Kg Elektromechanische Maschine
CN102214971A (zh) * 2010-04-12 2011-10-12 哈米尔顿森德斯特兰德公司 电马达中的非金属屏障的实施
US20110248586A1 (en) * 2010-04-12 2011-10-13 M Sadoques George A Implementation of a non-metallic barrier in an electric motor
JP2011223869A (ja) * 2010-04-12 2011-11-04 Hamilton Sundstrand Corp 揮発性環境において用いられるモータおよび装置、苛酷な環境にあるロータと該ロータを回転させるシステムとを分離するためのバリア構造
US8593024B2 (en) * 2010-04-12 2013-11-26 Hamilton Sundstrand Space Systems International, Inc. Implementation of a non-metallic barrier in an electric motor
US8432076B2 (en) * 2010-08-25 2013-04-30 Clean Wave Technologies, Inc. Systems and methods for providing fluid for internal cooling and lubrication of electric machines
US8427019B2 (en) 2010-08-25 2013-04-23 Clean Wave Technologies, Inc. Systems and methods for cooling and lubrication of electric machines
US8482168B2 (en) 2010-08-25 2013-07-09 Clean Wave Technologies, Inc. Systems and methods for fluid cooling of electric machines
US8410647B2 (en) 2010-08-25 2013-04-02 Clean Wave Technologies Inc. Systems and methods for fluid distribution for cooling and lubrication of electric machines
US8872400B2 (en) 2010-08-25 2014-10-28 Clean Wave Technologies, Inc. Systems and methods for regulating fluid flow for internal cooling and lubrication of electric machines
US10050495B2 (en) 2010-08-25 2018-08-14 Clean Wave Technologies, Inc. Systems and methods for regulating fluid flow for internal cooling and lubrication of electric machines
US20120049666A1 (en) * 2010-08-25 2012-03-01 Rudolph Garriga Systems and methods for providing fluid for internal cooling and lubrication of electric machines
US20140294631A1 (en) * 2011-11-07 2014-10-02 Denso Corporation Water pump
US9726182B2 (en) * 2011-11-07 2017-08-08 Toyota Jidosha Kabushiki Kaisha Electric water pump motor casing
US20160380514A1 (en) * 2015-02-23 2016-12-29 ALMOTT, Ltd. Brushless electrical machine with air cooling

Also Published As

Publication number Publication date
CH394365A (fr) 1965-06-30
GB969153A (en) 1964-09-09
OA00848A (fr) 1967-11-15
LU43078A1 (en:Method) 1963-03-25
FI40776B (en:Method) 1969-01-31
FR1322867A (fr) 1963-04-05
DE1887376U (de) 1964-02-13

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