EP1665499A1 - Machine electrique et pompe utilisant cette derniere - Google Patents

Machine electrique et pompe utilisant cette derniere

Info

Publication number
EP1665499A1
EP1665499A1 EP04765091A EP04765091A EP1665499A1 EP 1665499 A1 EP1665499 A1 EP 1665499A1 EP 04765091 A EP04765091 A EP 04765091A EP 04765091 A EP04765091 A EP 04765091A EP 1665499 A1 EP1665499 A1 EP 1665499A1
Authority
EP
European Patent Office
Prior art keywords
rotor
pump
electrical machine
magnets
machine according
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.)
Ceased
Application number
EP04765091A
Other languages
German (de)
English (en)
Inventor
Michal Kalavsky
Pietro De Filippis
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.)
BSH Hausgeraete GmbH
Original Assignee
BSH Bosch und Siemens Hausgeraete GmbH
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 BSH Bosch und Siemens Hausgeraete GmbH filed Critical BSH Bosch und Siemens Hausgeraete GmbH
Publication of EP1665499A1 publication Critical patent/EP1665499A1/fr
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K1/00—Details of the magnetic circuit
    • H02K1/06—Details of the magnetic circuit characterised by the shape, form or construction
    • H02K1/22—Rotating parts of the magnetic circuit
    • H02K1/27—Rotor cores with permanent magnets
    • H02K1/2706—Inner rotors
    • H02K1/272—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis
    • H02K1/274—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets
    • H02K1/2753—Inner rotors the magnetisation axis of the magnets being perpendicular to the rotor axis the rotor consisting of two or more circumferentially positioned magnets the rotor consisting of magnets or groups of magnets arranged with alternating polarity
    • H02K1/278—Surface mounted magnets; Inset magnets
    • 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
    • F04D13/064—Details of the magnetic circuit
    • 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
    • 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
    • H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans

Definitions

  • the present invention relates to an electrical machine and its use in a pump, in particular a water pump for a household appliance.
  • the electric machine is of the type with a permanent magnetic rotor and a stator provided with current-carrying windings.
  • Such a machine works by applying current to the windings in a predetermined time pattern in such a way that they generate a rotating magnetic field at the location of the rotor, in which the rotor tries to align itself and thus drive a shaft, or by driving the shaft of externally driven rotor generates a rotating magnetic field that induces oscillating currents in the windings of the stator.
  • the object of the present invention is to provide an electrical machine which can be implemented more economically without any significant reduction in performance than an electrical machine of conventional design with comparable dimensions or weight.
  • the rotor is equipped in the circumferential direction with at least six permanent magnets with flat outer surfaces, based on the radial direction of the rotor.
  • the magnets of the machine according to the invention are simply cuboid.
  • the flat outer surface of the magnets means that an air gap between them and the pole shoes of the stator is widened on average, the greater the number of magnets arranged on the rotor, the smaller this widening and can be with a number of six magnets to be accepted.
  • This wall must be firm on the one hand so that it does not touch the rotor during operation, but on the other hand it should be as thin as possible so that the air gap between the stator and rotor does not have to be made wider than absolutely necessary.
  • the wall is preferably stronger in an area located between two pole pieces of the stator than in an area opposite a pole piece.
  • the permanent magnets In order to protect the permanent magnets against corrosion by the coolant or other environmental influences, they are preferably formed with a plastic body, in particular of cylindrical shape. Its wall thickness also contributes to the required minimum width of the air gap.
  • cutouts are preferably formed on the peripheral surface of a core of the rotor, which receive the magnets in a form-fitting manner.
  • the axial length of such a, preferably laminated, rotor core should be slightly smaller than that of the magnets in order to achieve strong induction across the air gap.
  • the space available in the rotor should be used for as much magnetic mass as possible, in particular the distance between edges of adjacent magnets in the circumferential direction should not be more than 30%, better not more than 20%. the edge length of the magnets in the circumferential direction.
  • Magnets of high coercivity in particular made of NdFeB, are preferred.
  • the ratio of the circumference of the winding cores - and thus a wire length or mass to be wound on them - to the cross-sectional area of the winding cores should be as small as possible, in particular the expansion of the winding cores in axial Direction no more than four times its extent in the circumferential direction.
  • the six magnets of the rotor are preferably opposed to nine phases of the stator. These are periodically alternately connected to three different phases.
  • a preferred application of the electrical machine is as a motor for a pump.
  • the coolant chamber receiving the rotor can be designed to communicate with the pump chamber, so that a fluid pumped by the pump can simultaneously act as a coolant.
  • the rotor of the machine is formed with a plastic body, this can advantageously be formed in one piece with an impeller of the pump.
  • a gap between a wall of the pump chamber and the impeller, which opens onto an inlet channel of the pump chamber, runs radially towards the inlet channel in the mouth region and axially in the direction of the flow in the inlet channel , so that a flow through this gap meets the flow in the inlet duct at an acute angle.
  • the diameter of an inlet opening of the impeller adjoining the inlet channel matches the inside diameter of the inlet channel.
  • a preferred area of application of the pump according to the invention is in water-carrying household appliances such as washing machines and dishwashers.
  • Figure 1 is an axial section through a pump with an integrated motor according to the invention.
  • FIG. 3 is a perspective view of the rotor
  • FIG. 5 is a perspective view of the rotor core without magnets
  • FIG. 6 shows a detail of the rotor core from FIG. 5;
  • FIG. 7 shows an enlarged detail from FIG. 1.
  • the housing of the pump 1 is composed of a front housing shell 2 and a cup-shaped shield 3, both of which are positively connected to one another.
  • the housing of the pump 1 forms a one-piece pump chamber 4, which accommodates a rotor 5 with an impeller 6 in its interior.
  • the rotor 5 is rotatably mounted on an axis 9 by a front slide bearing 7 facing the impeller 6 and by a rear slide bearing 8 facing the shield 3.
  • the rotor 5 is on both ends fixed by a clamping ring 10, 11 each.
  • an axial bearing 12 is provided, and between the axial bearing 12 and the slide bearing 7, an O-ring 13 is mounted, by means of which the slide bearing 7 is sealed against liquid entry, in particular against water entry, and in the radial direction is elastically centered.
  • a rubber shock absorber 14 is inserted between the axial bearing 12 and the clamping ring 11.
  • the axis 9 is at its front end facing the impeller 6 in a seat 15 which is held in the center by support arms 16 in an inlet channel 17 of the front housing shell 2, and at its rear end facing the shield 3 in a seat 18 which is formed in the shield 3, rotatably mounted.
  • the rotor 5 contains a laminated rotor core 19 which carries permanent magnets 20 and which is shown in FIGS. 3 to 6 is described in more detail.
  • the rotor core 19 and the magnets 20 are formed in a fluid-tight manner with a jacket 21 made of plastic material, which is formed in one piece with the impeller 6.
  • the impeller 6 is constructed in one piece in a manner known per se from a base flange 22 which extends essentially in a radial plane and from which extend blades 23 which extend in the axial and radial directions and which in turn carry a cover flange 24.
  • the cover flange 24 has a shape similar to a truncated rotational hyperboloid with an inlet opening 25 arranged in the extension of the inlet channel 17.
  • FIG. 2 shows a section through the motor of the pump 1 along the line II-II from FIG. 1.
  • the axis 9, the rotor core 19 with the six magnets 20 mounted thereon, which surrounds the magnets 20 in a cylindrical manner, can be seen from the inside outwards Sheath 21, a water-filled gap 26, the shield 3 and the stator 27.
  • the stator 27 has an outer frame, from which nine winding cores 28 extend radially inwards, which are widened at their ends to form pole pieces 29. A wire winding that is present on each of the winding cores 28 is shown symbolically on only three of them.
  • These three winding cores which are at an angular distance of 120 degrees from one another, are connected to the same phase of a three-phase supply current supplied by an electronic inverter, the other phases of which supply the windings of the other winding cores, which are not shown.
  • the width b of the winding cores 28 in the circumferential direction is at least a quarter of their axial length I, that is to say the cross section of the winding cores 28 is comparatively compact.
  • the cylindrical wall of the shield 3 in the section of FIG. 2 is divided into sections of different wall thickness.
  • Sections 30, each opposite a pole piece 29, have a small wall thickness, while in an intermediate space between two pole pieces 29 sections 31 are reinforced by outwardly directed ribs in order to give the shield 3 the required mechanical strength.
  • the thickness of the sections 30 can thus be selected to be smaller than the wall thickness that would be required for a wall of uniform thickness, and the width of the air gap between the pole shoes and the rotor can be kept comparatively small.
  • the width of the gap 26 is slightly larger than the mesh width of a particle filter, not shown, upstream of the inlet of the pump 1.
  • the mesh width of a sieve serving as a particle filter can be, for example, one millimeter; in this case, the width of the gap 26 should be approximately 1.1 millimeters so that particles that pass through the sieve have, do not get stuck between the shield 3 and the plastic jacket 21 of the rotor 5 and can block the motor.
  • FIGS. 3 and 4 each show a perspective view or an axial section of the rotor core 19 with the magnets 20 mounted thereon.
  • the rotor core 19 is formed by a laminated core, the axial length of which is slightly smaller than that of the magnets 20 NdFeB are arranged on the outer surfaces of the rotor core 19 forming an equilateral hexagon.
  • Typical dimensions of the magnets 20 for use in a dishwasher are a thickness of approximately 2.5 millimeters, an axial length of approximately 18 millimeters (with a length of the rotor core of approximately 15 millimeters) and one Edge length in the circumferential direction of approx. 8 millimeters.
  • the distance between the edges of adjacent magnets 20 should not be more than two to 2.5 millimeters. A certain minimum distance is required in the embodiment considered here in order to enable simple and nevertheless exact mounting of the magnets 20.
  • flat recesses 32 are formed on the outer sides of the rotor core 19, into which the magnets 20 form-fit, in each case the lateral flanks 33 touching the recess 32, are inserted. In this way, the magnets 20 can be mounted on the rotor core 19 quickly and without individual measures, and a well balanced, quiet and smoothly running rotor can be obtained in the process.
  • FIG. 7 is an enlarged detail of FIG. 1, which shows a further special feature of the pump according to the invention that is independent of the structure of the motor.
  • FIG. 1 between the front housing shell 2 of the pump 1 and the cover flange 24 of the impeller 6, a narrow gap 34 is flushed through by the pumped liquid. Because the pressure of the liquid in the outlet area of the pump, radially outside the impeller 6, which is larger than in the inlet duct 17, liquid flows back through this gap 34 from the outlet region to the inlet duct 17. The mouth region 35 of the gap 34 shown in FIG.
  • the inlet duct 17 of the front housing shell 2 forms an extension at the mouth region 35, into which the tip of the cover flange 24 engages, so that there is no difference between the diameter of the inlet duct 17 and that of the inlet opening 25 of the cover flange 24. This effectively suppresses turbulence in the pump inlet area that affects the efficiency of the pump.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne une machine électrique comportant un rotor à aimants permanents (5) et un stator (27) pourvu d'enroulements conducteurs. Le rotor (5) est pourvu, dans le sens périphérique, d'au moins six aimants permanents dont les surfaces extérieures, par rapport à la direction radiale du rotor (5), sont planes. L'invention concerne également une pompe (1) qui est entraînée par ladite machine électrique et dans laquelle un espace (34) s'étend entre une paroi (3) de la chambre de pompe (4) et une roue à ailettes (6) montée dans cette dernière. Une zone, dans laquelle l'espace (34) débouche sur un canal d'entrée (17) de la chambre de pompe (4), s'étend radialement vers le canal d'entrée (17) et axialement dans le sens de l'écoulement dans ce dernier (17).
EP04765091A 2003-09-11 2004-09-10 Machine electrique et pompe utilisant cette derniere Ceased EP1665499A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10342050A DE10342050A1 (de) 2003-09-11 2003-09-11 Elektrische Maschine und diese verwendende Pumpe
PCT/EP2004/010168 WO2005027312A1 (fr) 2003-09-11 2004-09-10 Machine electrique et pompe utilisant cette derniere

Publications (1)

Publication Number Publication Date
EP1665499A1 true EP1665499A1 (fr) 2006-06-07

Family

ID=34258579

Family Applications (1)

Application Number Title Priority Date Filing Date
EP04765091A Ceased EP1665499A1 (fr) 2003-09-11 2004-09-10 Machine electrique et pompe utilisant cette derniere

Country Status (3)

Country Link
EP (1) EP1665499A1 (fr)
DE (1) DE10342050A1 (fr)
WO (1) WO2005027312A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005036818B4 (de) * 2005-08-04 2015-03-05 BSH Bosch und Siemens Hausgeräte GmbH Pumpengehäuse, Pumpe und wasserführendes Haushaltsgerät
DE102008055613A1 (de) * 2008-11-03 2010-05-06 Wilo Se Kreiselmotorpumpe
GB2468718A (en) 2009-03-20 2010-09-22 Control Tech Dynamics Ltd Securing permanent magnets to a laminated rotor
DE102009046681A1 (de) 2009-11-13 2011-05-19 BSH Bosch und Siemens Hausgeräte GmbH Antriebsmotor zum Antreiben einer Komponente eines Hausgeräts, Antriebseinrichtung und Hausgerät
DE102010042513A1 (de) 2010-10-15 2012-04-19 BSH Bosch und Siemens Hausgeräte GmbH Pumpe für ein Hausgerät, Hausgerät mit einer Pumpe und Verfahren zum Betreiben eines Hausgeräts
DE102010042491A1 (de) 2010-10-15 2012-05-03 BSH Bosch und Siemens Hausgeräte GmbH Pumpeneinrichtung für ein Hausgerät, Hausgerät und Verfahren zum Betreiben eines Antriebsmotors
DE102012211082A1 (de) * 2012-06-28 2014-01-02 Robert Bosch Gmbh Pumpe für einen Kühlkreislauf eines Kraftfahrzeugs
DE102013014139A1 (de) * 2012-12-21 2014-06-26 Brose Fahrzeugteile GmbH & Co. Kommanditgesellschaft, Würzburg Elektromotorische Wasserpumpe
SE539016C2 (en) * 2015-07-17 2017-03-21 Hagnestål Anders A generator for generating electric energy from movements of sea water
DE102017206092A1 (de) * 2017-04-10 2018-10-11 BSH Hausgeräte GmbH Elektrischer Antriebsmotor

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11166500A (ja) * 1997-12-03 1999-06-22 Toshiba Ave Co Ltd ポンプ
JP2000014110A (ja) * 1998-06-19 2000-01-14 Toshiba Corp モータポンプ

Family Cites Families (15)

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FR2608228B1 (fr) * 1986-12-12 1991-07-19 Valeo Pompe a liquide, notamment pompe a eau, en particulier pour vehicules automobiles
US4973872A (en) * 1988-10-07 1990-11-27 Emerson Electric Co. Dynamoelectric machine rotor assembly with improved magnet retention stucture
JPH03289340A (ja) * 1990-03-31 1991-12-19 Toshiba Corp 電動機
JPH0847190A (ja) * 1994-07-28 1996-02-16 Shibaura Eng Works Co Ltd 電動機
JPH0842482A (ja) * 1994-07-29 1996-02-13 Japan Servo Co Ltd キャンドモータポンプ
DE19648758A1 (de) * 1996-11-25 1998-06-04 Magnet Motor Gmbh Dauermagnetisch erregte elektrische Maschine mit Rotorrückschluß
US5831364A (en) * 1997-01-22 1998-11-03 Ingersoll-Dresser Pump Company Encapsulated magnet carrier
JP3905186B2 (ja) * 1997-09-10 2007-04-18 日本電産株式会社 ポンプ用モータ
FR2769424A1 (fr) * 1997-10-03 1999-04-02 Thomson Csf Moteur synchrone comportant un rotor a aimants permanents
DE60014780T2 (de) * 1999-06-30 2005-03-10 Shin-Etsu Chemical Co., Ltd. Auf seltenen Erden basierender gesinterter Dauermagnet und mit einem solchen Magnet versehener Synchronmotor
JP2001025193A (ja) * 1999-07-09 2001-01-26 Nippon Densan Corp 永久磁石型回転子及び永久磁石飛散防止用カバー
ITTO990154U1 (it) 1999-08-06 2001-02-06 Bitron Spa Motore elettrico per la pompa della benzina di un motore a combustioneinterna.
JP2001061244A (ja) 1999-08-19 2001-03-06 Asmo Co Ltd ローターの構造
DE10026003A1 (de) * 2000-05-25 2001-12-06 Bosch Gmbh Robert Stator
JP2002272032A (ja) * 2001-03-06 2002-09-20 Mitsubishi Electric Corp 円筒形永久磁石回転子およびその製造方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH11166500A (ja) * 1997-12-03 1999-06-22 Toshiba Ave Co Ltd ポンプ
JP2000014110A (ja) * 1998-06-19 2000-01-14 Toshiba Corp モータポンプ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2005027312A1 *

Also Published As

Publication number Publication date
WO2005027312A8 (fr) 2006-04-20
DE10342050A1 (de) 2005-04-07
WO2005027312A1 (fr) 2005-03-24

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