US3762839A - Centrifugal pump with magnetic drive - Google Patents

Centrifugal pump with magnetic drive Download PDF

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Publication number
US3762839A
US3762839A US3762839DA US3762839A US 3762839 A US3762839 A US 3762839A US 3762839D A US3762839D A US 3762839DA US 3762839 A US3762839 A US 3762839A
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pole ring
pole
ring
magnetic
centrifugal pump
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English (en)
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N Laing
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
    • H02K49/10—Dynamo-electric clutches; Dynamo-electric brakes of the permanent-magnet type
    • H02K49/104—Magnetic couplings consisting of only two coaxial rotary elements, i.e. the driving element and the driven element
    • 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
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/025—Details of the can separating the pump and drive area
    • 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
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/026—Details of the bearings
    • 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
    • F04D13/021—Units comprising pumps and their driving means containing a coupling
    • F04D13/024—Units comprising pumps and their driving means containing a coupling a magnetic coupling
    • F04D13/027—Details of the magnetic circuit
    • 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
    • F04D29/04—Shafts or bearings, or assemblies thereof
    • F04D29/046—Bearings
    • F04D29/0467—Spherical bearings
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K49/00—Dynamo-electric clutches; Dynamo-electric brakes
    • H02K49/06—Dynamo-electric clutches; Dynamo-electric brakes of the synchronous type
    • 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

Definitions

  • ABSTRACT In a centrifugal pump in which the impeller and a first pole ring of a magnetic transmission form a unitary structure, the latter is driven through a magnetically permeable separating wall.
  • the magnetic transmission has a second pole ring and, between it and the separating wall, a conductor pole ring comprising a plurality of conductors with the two pole rings being independently arranged for rotation with respect to one another.
  • the two pole rings each have a plurality of pole faces of alternating polarity with one of the pole rings having more pole faces than the other, whereby rotation of one of the pole rings with respect to the other pole ring will be at a predetermined ratio.
  • the invention relates to centrifugal pumps for liquids or gases, whose impeller forms a unit with a magnetic pole ring and which is driven by a rotating magnetic field, the rotating magnetic field being produced by a motor-driven pole ring having a number of poles which is greater than that of the said magnetic pole ring.
  • the invention thus relates to centrifugal pumps, whose impellers work at a speed different from that of the rotor of the driving motor.
  • the transmission arrangement is not a magnetic coupling, but a magnetic transmission.
  • Two of these elements consist of rings, separated by an air gap, with non-meshing, magnetically conductive teeth, which form regions of alternately high and low magnetic reluctance, the difference between the number of teeth on the two rings being small, so that, on one diameter only, two teeth of the outer ring are positioned exactly opposite two teeth of the inner ring.
  • One of these rings may be permanently magnetised or provided with a winding which magnetises the ring so that a magnetic field is produced which causes alignment of two oppositely positioned teeth of the rings.
  • This transmission constitutes the magnetic analogue of the mechanical hypocycloid gear in which only two teeth of the outer ring mesh at any one time.
  • extremely high stresses for power transmission can be employed with gears, only very small shear forces can be transmitted by magnetic transmissions with poles on either side of an air gap which enables contactless running.
  • only small torques can be transmitted by any known magnetic transmissions, so that they cannot be considered for the transmission of larger powers.
  • this kind of transmission is possible only for very high transmission ratios of, for example, 1:20 or 1:50 but not transmission ratios of 1:2 or 1:5, so that this kind of transmission does not present a usable substitute for gears for the transmission of larger powers.
  • a frictionless magnetic transmission is also known, in which ferro-magnetic coupling elements are separated by a predetermined distance from a driving and a driven part, the whole assembly being accommodated in a housing which provides a closed magnetic circuit.
  • ferro-magnetic coupling elements are separated by a predetermined distance from a driving and a driven part, the whole assembly being accommodated in a housing which provides a closed magnetic circuit.
  • this form of transmission only one coupling element at a time carries the maximum magnetic flux, so that therefore only the principle of the stepping gear is applied, in which only a very small region of the circumference is actively employed for the transmission of torque at any one time
  • This magnetic transmission also has the disadvantages already mentioned.
  • a magnetic transmission in which a driven magnetic system is coupled to a driving magnetic system by fields of magnetic force and the transmission ratio is formed by branching of the magnetic flux in a ferromagnetic coupling member.
  • the direction of rotation of the output of this transmission is not defined. Only by means of a plurality of systems which are angularlydisplaced and axially juxtaposed, can the direction of rotation of such transmissions be predetermined.
  • the latter has the disadvantage that the effective flux is at any one time confined to a region of not more than one-third of the axial length and that the magnetic paths become very large; for this reason again they are not suitable for the transmission of large powers.
  • centrifugal pumps having magnetic transmissions, capable of transmitting large mechanical powers with minimum material cost and any desired transmission ratio, and particularly at low transmission ratios.
  • this is achieved by constructing the conductors in such a way that the magnetic flux flowing through a pole of the pole ring with the smaller number of poles is distributed over at least two poles of the pole ring with the greater number of poles.
  • at least one conductor has at least two pole faces facing the pole rings with the larger number of poles.
  • the problem underlying the invention is solved by making at least one face of the conductor facing the pole ring with the larger number of poles at least as wide as the distance between two adjacent pole centres of this pole ring.
  • the three elements of a magnetic transmission according to the invention are arranged in the form of three concentric rings. If with this arrangement the number of the conductors equals twice the number of the poles of the inner pole ring which has the higher speed, then the alternating magnetic field which the driving pole ring produces in each conductor can be transformed into a two-phase, phase-symmetrical, circular and substantially sinusoidal rotating field, so that the same conditions apply to the driven pole ring as to the rotor of a three-phase induction motor.
  • the radial flux which in an electric motor is provided by windings, is generated by permanent magnets of a rotating pole ring in these magnetic transmissions.
  • the same induction as in the case of an electric motor can be provided, so that the transmittable torques correspond to those of electric motors having rotors of the same size.
  • magnetic transmissions may also be built in synchronous form, if the driven pole ring is not in the form of an induction rotor (squirrel cage rotor) as in the case of an electric motor, but in the form of a permanent magnet rotor.
  • the main area of application of the centrifugal pumps having magnetic transmissions is the conversion of the speed of mains-fed induction motors whose maximum speed is limited. Since the output of centrifugal pumps for given dimensions of the casing increases as the speed, a step-up transmission results in spaceand material saving constructions. Basically, however, the invention may also find application for centrifugal pumps whose impeller speed is less than that of the mtor, particularly in the case of drivingor medium frequency motors.
  • any one of the three elements can be the driving and any one of the three elements the driven element. It is further emphasised that one of the three elements must be held stationary or supported by a stationary system, which is usually done by supporting it by a housing element.
  • Transmissions for centrifugal pumps according to the invention may be built up in the form ofa cylinder, s'uperirnposd by a hollowcylinder and a further hollow cylinder surrounding them.
  • the inner and outer pole rings may also be arranged relatively eccentrically.
  • the air gaps need, however, not necessarily lie on cylindrical envelopes; they may also lie on conical envelopes, spherical surfaces and planes. in the latter version the arrangement consists of three discs, and it is not necessary for the rotating discs to be geometrically co-axial.
  • the high-speed pole ring of the magnetic transmission is constructed as a unit with theimpeller wheel, whilst the low-speed pole ring is driven by the motor.
  • the third element, the conductor ring, is separated from the pump impeller by a wall, so that hermetic sealing is effected.
  • Hermetically sealed pumps with thin-walled magnetically permeable separating walls are known.
  • the invention enables the construction of pumps in which the walls through which magnetic forces are fed into the interior of the pump, can be made of any desired thickness, so that hermeticallysealed pumps constructed with magnetic transmissions in accordance with the invention can be manufactured for pressures which can be practically as high as desired and at which thin-walled magnetically permeable separating walls of magnetic couplings would tear.
  • the thin-walled separating wall only acts as a sealing element, whilst the conductor ring also acts as a mechanical support against high pressures.
  • magnetic transmissions with a transmission ratio in l are meaningful.
  • the new magnetic transmissions can also be combined with magnetic bearing systems, so that desides contactless transmission of the torque, the bearing can also be contactless, except for a support at the centre of a spherical section.
  • the magnetic transmissions for centrifugal pumps in accordance with the invention may be classified according to their geometric parameters; these include the number of poles of the low speed and high speed pole ring, the number of conductors, the number of pole areas of the conductors, as well as the spacing of the pole areas of adjacent conductors. Accordingly, let, by definition:
  • p Number of poles of the low speed pole ring (large number of poles) q Number of poles of the high speed pole ring (small number of poles) m Transmission ratio of the transmission, where m always p/q r Number of conductors r Number of pole areas of the conductors facing the low speed pole ring r,, Number of pole areas of the conductors facing the high speed pole ring j Spacing of the pole centres of the pole areas facing the low speed pole ring, of different adjacent conductors, relative to the spacing of the centres of adjacent poles of the low speed pole ring.
  • the highest transmission ratio is always given by the ratio m (PM)
  • the conductor ring formed by conductors 17 is held stationary.
  • the low speed pole ring is held stationary, then, for the same embodiment, we get the lower transmission ratio of the conductor ring to the high speed'pole ring Using the same transmission, we get the lowest transmission ratio when the high speed pole ring is held stationary.
  • All the transmissions for centrifugal pumps in accordance with the invention thus enable three transmission ratios to be obtained, the direction of rotation for the transmission ratio m changing in the case of the ratio 111,.
  • These speed ratios are exactly true only where two pole rings are magnetised by permanent-or electromagnets. if one of the pole rings is in the form of a hysteresis magnet or a short-circuited rotor like the rotor of an electric motor, then the slip of such a pole ring is superimposed on the transmission ratio.
  • the driving portion it is not necessary for the driving portion to be provided with permanentor electromagnets. It is also permissible for the driven pole ring only to effect the magnetisation.
  • a claw pole construction is provided for the magnetic material, in which adjacent poles of the same polarity are short-circuited together by soft magnet rings, so that a iarge portion of the entire magnetic material is operative at all times.
  • FIG. 1 shows a pump with a magnetic transmission
  • FIG. 2 shows a turbo-compressor drive with a magnetic transmission
  • FIG. 3 shows a borehole pump with a step-up magnetic transmission
  • FIG. 4 shows an axial-flow pump with a step-down magnetic transmission
  • FIGS. 5a-5d are a plan view of a preferred form of a magnetic transmission constructed according to the invention with odd series cascading in one direction and having transmission ratios 5, 9, l3 and 5 respectively;
  • FIGS. 6a-6c show a different embodiment of a magnetic transmission with odd series cascading in the opposite direction of rotation than in FIG. 5 and having the transmission ratios 3, 7, 11 respectively;
  • FIGS. 7a-7d show a further embodiment of a magnetic transmission with even series cascading in one direction having transmission ratios 2, 4, 8 and 6 respectively;
  • FIGS. Sa-Sd show a magnetic transmission having even series cascading in a direction opposite to the direction of rotation of FIG. 7 and having tranmission ratios 4, 6, 8 and I0 respectively;
  • FIG. 9 shows a spherical construction of the magnetic transmission according to the invention, preferably for pumps with magnetic bearings
  • FIG. 10 shows a developed view of a sheet metal strip for producing the conductors.
  • FIG. 11a is a plan view of a part of a low speed pole ring for use in a magnetic transmission where the ring has magnetically conductive pole shoes;
  • FIG. 11b is an enlarged section through a part of a different embodiment of a low speed pole ring.
  • FIG. 11c is a section through a still further embodiment of a low speed pole ring having claw poles
  • FIG. 12a is a plan view of a magnetic transmission similar to that shown in FIG. 5b illustrating the magnetic lines of flux in one position of the high speed pole ring;
  • FIG. 12b is a view similar to FIG. 12a illustrating the magnetic lines of flux in a different position of the high speed pole ring.
  • FIG. 120 is a view similar to FIG. 12a illustrating the high speed pole ring in a still further position.
  • FIG. 13a illustrates the construction of a magnetic tramission having the ratio 1 to I wherein the conductors are arranged radially;
  • FIG. 13b is a view similar to FIG. 13a but where the conductors are arranged in a cross formation and where the direction of the rotation of the pole ring is opposite to that shown in FIG. 13a;
  • FIG. 14a is a plan view of a magnetic transmission with a three-phase rotating field
  • FIG. 14b is a view similar to FIG. 14a having different conductor configurations
  • FIG. 140 is a view similar to FIG. 140 having a different number of conductors.
  • FIG. 14d is a view similar to FIG. 14a of a still further embodiment having a different number of conductors and conductor configurations;
  • FIG. 15 shows a short-circuited rotor in a magnetic transmission with a conductor ring of special construction.
  • FIG. 1 shows a pump according to the invention with a magnetic transmission for increasing the speed of the pump runner 123, whereby the pump may be constructed in a very compact manner.
  • the conductors 17 are made up of foils arranged one above the other; the pole ring consists of radially magnetised permanent magnets which are joined to each other in magnetically conducting manner by the ring 121 for closing the magnetic circuit.
  • the pole ring 122 drives the pump runner 123.
  • a magnetically permeable separating wall 124, of spherical form, is provided for hermetically sealing the interior of the pump.
  • the motor 125 drives the outer pole ring via the disc-like wheel 126.
  • FIG. 2 shows a turbo-machine of the same kind as that of FIG. 1, but designed as a compressor, particularly for refrigerants.
  • hermetic sealing is of very great importance, since refrigerant is always lost through the shaft seals.
  • the invention provides for the conductors a construction of extremely thin laminae with minimum hysteresis and eddy current losses, such as those used in audio frequency transformers.
  • Pole shoes 132 of soft magnetic material are provided between the permanent magnet pieces 131. of the outer pole ring and the conductors 130.
  • the spherical separator 134 is preferably made of synthetic material, e.g. a glass fibre reinforced epoxy resin, which is made impereable to gasses by a very thin layer of metal by electroor vapour deposition.
  • FIG. 3 shows a bore hole pump, in which a motor 111, which is accommodated in a hermetically sealed housing 110, drives the pole ring 112 of the magnetic transmission with the conductor ring 113.
  • the high speed pole ring 115 rotates in a conical, magnetically impermeable, separating wall 114, the pole ring being conical and provided with helical channels 116, which convey a small quantity of liquid into the magnetic air gap. This results in hydrodynamic lubrication, so that further bearings can be dispensed with.
  • FIG. 4 shows a stirring mechanism in the form of an axial-flow pump which is driven by a step-down magnetic transmission in accordance with the invention.
  • the inner, high speed pole ring 102 is mounted on the motor shaft 101 of the motor (shown broken); the conductor ring is made up of laminar conductors 103 and, with its rotating field, drives the low speed outer pole ring 106 with the stirrer 105, whose hub is supported on a spherical bearing 107.
  • a conical sheath 108 serves to support the spherical bearings, the sheath being hermetically sealingly joined to the separating membrane

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dynamo-Electric Clutches, Dynamo-Electric Brakes (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US3762839D 1969-02-10 1971-05-17 Centrifugal pump with magnetic drive Expired - Lifetime US3762839A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT131969 1969-02-10
AT1210169 1969-12-30

Publications (1)

Publication Number Publication Date
US3762839A true US3762839A (en) 1973-10-02

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US3762839D Expired - Lifetime US3762839A (en) 1969-02-10 1971-05-17 Centrifugal pump with magnetic drive

Country Status (7)

Country Link
US (1) US3762839A (fr)
JP (1) JPS4933308B1 (fr)
BE (1) BE745684A (fr)
CA (1) CA928755A (fr)
DE (2) DE2005803A1 (fr)
FR (1) FR2030407A1 (fr)
GB (2) GB1305652A (fr)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4035108A (en) * 1971-10-07 1977-07-12 Nikolaus Laing Axial flow pump for a pivotal rotor
US4352646A (en) * 1975-01-13 1982-10-05 Ingeborg Laing Rotodynamic pump with spherical motor
WO1984000448A1 (fr) * 1982-07-14 1984-02-02 Hubert Bald Procede et dispositif pour transformer des mouvements oscillatoires de masses en mouvements rotatifs de rotors
US4984972A (en) * 1989-10-24 1991-01-15 Minnesota Mining And Manufacturing Co. Centrifugal blood pump
EP0669700A1 (fr) * 1994-02-23 1995-08-30 Philips Patentverwaltung GmbH Engrenage magnétique avec plusieurs pièces qui coopérent magnétiquement et qui se déplacent les unes par rapport aux autres
US6440055B1 (en) 1999-09-17 2002-08-27 Fresenius Hemocare Gmbh Magnetic gear and centrifuge having a magnetic gear
EP2009233A1 (fr) * 2007-06-29 2008-12-31 Anest Iwata Corporation Palier magnétique et dispositif de couplage
US20090022607A1 (en) * 2004-10-06 2009-01-22 Ebm-Papst St. Georgen Gmbh & Co. Kg Arrangement for delivering fluids
GB2453052A (en) * 2007-09-20 2009-03-25 Schlumberger Holdings Methods and apparatus for characterizing downhole fluids, and circulation pumps for use in such methods and apparatus
CN104196979A (zh) * 2014-09-05 2014-12-10 沈嘉诚 永磁传动器
US11125141B2 (en) 2019-02-21 2021-09-21 Ford Global Technologies, Llc Method and system for an engine assembly

Families Citing this family (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518688B1 (fr) * 1981-12-22 1987-04-10 Sulzer Ag Dispositif reducteur de vitesse
DE3246122A1 (de) * 1982-12-13 1984-06-14 Heinz 4350 Recklinghausen Schiweck Magnetgetriebe
GB2188376A (en) * 1986-03-24 1987-09-30 Linear Motors Ltd Electric driven compressor
DE4223814A1 (de) * 1992-07-20 1994-01-27 Gerd Schuesler Magnetisches Schneckengetriebe
DE4223826C2 (de) * 1992-07-20 1994-05-11 Gerd Schuesler Magnetisches Parallelwellengetriebe
DE4223815C2 (de) * 1992-07-20 1994-05-11 Gerd Schuesler Magnetisches Reihengetriebe
GB9501229D0 (en) * 1995-01-21 1995-03-15 Robinson Alan K Improvements relating to magnetic coupling systems
DE19711047C2 (de) * 1997-03-03 1999-07-15 Manfred Dingel Wirbelstrombremse
DE19812348C2 (de) * 1998-03-20 2000-07-27 Lobinger Karl Alfred Johann Magnetische Kraftübertragungsvorrichtung
JP2003009504A (ja) * 2001-06-22 2003-01-10 Ckd Corp 動力伝達装置
JP5762113B2 (ja) * 2011-04-28 2015-08-12 平田　勝弘 磁気変速装置
DE102012001880A1 (de) 2012-02-01 2013-08-01 Sönke Sievers Magnus-Effekt-Propeller
DE102014119265A1 (de) * 2014-11-24 2016-05-25 Ebm-Papst St. Georgen Gmbh & Co. Kg Baukastensystem zur Herstellung von Magnetgetrieben
DE102015209459A1 (de) * 2015-05-22 2016-11-24 Mahle International Gmbh Magnetgetriebe, insbesondere für eine Abwärmenutzungseinrichtung
JP2022146424A (ja) * 2021-03-22 2022-10-05 三菱重工業株式会社 磁気ギアード回転機械、及び発電システム

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4035108A (en) * 1971-10-07 1977-07-12 Nikolaus Laing Axial flow pump for a pivotal rotor
US4352646A (en) * 1975-01-13 1982-10-05 Ingeborg Laing Rotodynamic pump with spherical motor
WO1984000448A1 (fr) * 1982-07-14 1984-02-02 Hubert Bald Procede et dispositif pour transformer des mouvements oscillatoires de masses en mouvements rotatifs de rotors
US4984972A (en) * 1989-10-24 1991-01-15 Minnesota Mining And Manufacturing Co. Centrifugal blood pump
AU628676B2 (en) * 1989-10-24 1992-09-17 Minnesota Mining And Manufacturing Company Centrifugal blood pump
EP0669700A1 (fr) * 1994-02-23 1995-08-30 Philips Patentverwaltung GmbH Engrenage magnétique avec plusieurs pièces qui coopérent magnétiquement et qui se déplacent les unes par rapport aux autres
US5633555A (en) * 1994-02-23 1997-05-27 U.S. Philips Corporation Magnetic drive arrangement comprising a plurality of magnetically cooperating parts which are movable relative to one another
US6440055B1 (en) 1999-09-17 2002-08-27 Fresenius Hemocare Gmbh Magnetic gear and centrifuge having a magnetic gear
US20090022607A1 (en) * 2004-10-06 2009-01-22 Ebm-Papst St. Georgen Gmbh & Co. Kg Arrangement for delivering fluids
EP2009233A1 (fr) * 2007-06-29 2008-12-31 Anest Iwata Corporation Palier magnétique et dispositif de couplage
GB2453052A (en) * 2007-09-20 2009-03-25 Schlumberger Holdings Methods and apparatus for characterizing downhole fluids, and circulation pumps for use in such methods and apparatus
US20090078412A1 (en) * 2007-09-20 2009-03-26 Schlumberger Technology Corporation Circulation pump for circulating downhole fluids, and characterization apparatus of downhole fluids
GB2453052B (en) * 2007-09-20 2010-03-17 Schlumberger Holdings Methods and apparatus for characterizing downhole fluids, and circulation pumps for use in such methods and apparatus
US7707878B2 (en) 2007-09-20 2010-05-04 Schlumberger Technology Corporation Circulation pump for circulating downhole fluids, and characterization apparatus of downhole fluids
CN104196979A (zh) * 2014-09-05 2014-12-10 沈嘉诚 永磁传动器
CN104196979B (zh) * 2014-09-05 2017-02-08 沈嘉诚 永磁传动器
US11125141B2 (en) 2019-02-21 2021-09-21 Ford Global Technologies, Llc Method and system for an engine assembly

Also Published As

Publication number Publication date
GB1305651A (fr) 1973-02-07
DE2005803A1 (de) 1971-01-21
BE745684A (fr) 1970-08-10
DE2048286B2 (de) 1975-08-28
JPS4933308B1 (fr) 1974-09-06
FR2030407A1 (fr) 1970-11-13
GB1305652A (fr) 1973-02-07
CA928755A (en) 1973-06-19
DE2048286A1 (de) 1971-11-11

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