WO2003038972A1 - Machine electrique excitee par aimants permanents - Google Patents

Machine electrique excitee par aimants permanents Download PDF

Info

Publication number
WO2003038972A1
WO2003038972A1 PCT/DE2002/002211 DE0202211W WO03038972A1 WO 2003038972 A1 WO2003038972 A1 WO 2003038972A1 DE 0202211 W DE0202211 W DE 0202211W WO 03038972 A1 WO03038972 A1 WO 03038972A1
Authority
WO
WIPO (PCT)
Prior art keywords
permanent magnets
sleeve
machine according
pole housing
cover
Prior art date
Application number
PCT/DE2002/002211
Other languages
German (de)
English (en)
Inventor
Recep Tarhan
Werner Dilger
Rolf Pierenkemper
Original Assignee
Robert Bosch 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 Robert Bosch Gmbh filed Critical Robert Bosch Gmbh
Publication of WO2003038972A1 publication Critical patent/WO2003038972A1/fr

Links

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
    • 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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/17—Stator cores with permanent magnets

Definitions

  • the invention is based on a permanent magnet-excited electrical machine, in particular a DC motor for vehicles, according to the preamble of claim 1.
  • the stator poles are formed by rectangular permanent magnets and pole shoes placed on them.
  • the permanent magnets rest on flat support surfaces formed on the pole housing, and the shell-shaped pole shoes, with their free surface facing away from the permanent magnet, together with the rotor enclosed by the stator, limit the working air gap of the direct current motor.
  • the permanent magnets are on the pole housing and the pole pieces on the permanent magnets by gluing, overmolding and. attached.
  • Direct current motors are also known in which the stator poles are formed by shell-shaped permanent magnet segments which are glued to the inner surface of the annular pole housing and which directly limit the working air gap with their free surface. For reasons of flow optimization in the working air gap, the radial thickness of the permanent magnet segments is reduced in the region of the segment edges.
  • the electrical machine according to the invention with the features of claim 1 has the advantage that, by means of the thin-walled cover in the interior of the stator, an annular space is formed which is sealed off from the remaining stator interior of the machine and in which the permanent magnets lie.
  • the closed annular space prevents material fragments or pieces detaching from the permanent magnets from penetrating into the working air gap between the stator and rotor as a result of breakage or material stresses and leading to jamming or blocking of the rotor of the electrical machine.
  • This is of particular importance for DC motors that are used for steering power support in steering gears of vehicles; because if the rotor jammed or stuck, the vehicle would be unmanageable.
  • the overload clutches currently used to prevent such a situation can be saved.
  • the thin-walled cover has a sleeve which engages non-positively on the free surfaces of the permanent magnets and two cover rings which rest with their outer contour on the inner surface of the pole housing and overlap the end edges of the sleeve.
  • Each cover ring carries on its end facing the sleeve an axially projecting collar onto which a sleeve end is pushed.
  • the cover that covers the permanent magnets both axially and radially is constructed in a structurally simple manner.
  • the sleeve is preferably made from tape material, the size of the selected tape length determining the sleeve diameter.
  • the outer diameter of the sleeve is larger than the clear distance between diametrically opposed permanent magnets.
  • the clear distance between the diametrical permanent magnets is measured in the magnet center.
  • Fig. 2 is a perspective view of a cover of the permanent magnets in
  • the armature or rotor 12 comprises an armature or rotor body 14 which is non-rotatably seated on a rotor shaft 13 and an armature or rotor winding 15 which lies in axial slots of the rotor body 13.
  • the rotor winding 15 is connected to a commutator 16 which is also non-rotatably seated on the rotor shaft 13.
  • the current supply to the rotor winding 15 takes place via a brush system 17, the commutator brushes 18 of which grind on the fins of the commutator 16.
  • the stator 11 has an annular pole housing 20 and an even number of stator poles 19 which are arranged offset by the same circumferential angle on the pole housing 20.
  • Each stator pole 19 consists of a shell-shaped permanent magnet 21, which is fastened to the inner surface 201 of the pole housing 20, preferably by gluing, and the approximately curved, free surface of which is attached to the Rotor body 14 delimits a working air gap 22.
  • the individual permanent magnets 21 extend almost over a full pole pitch, which in a four-pole version of the stator 11 is 90 °, so that only a relatively small gap distance remains between adjacent permanent magnets 21. However, they can also be designed with a smaller width in the circumferential direction.
  • the edge areas of the shell-shaped permanent magnets 21 are flattened, so that the radial thickness of the permanent magnets 21 is reduced at the magnetic edges.
  • the annular pole housing 20 is covered with a bearing plate 23, 24 at each end face. Each end shield 23, 24 receives a rotary bearing 25 or 26 for the rotor shaft 13.
  • the bearing plate 23 on the left in FIG. 1 also forms a platform for determining the
  • the ring-shaped pole housing 20 is fastened to this end shield 23, and the second end shield 24 is in turn fastened to the pole housing 20.
  • Excluding the working air gap 22 is one of the Permanent magnets 21 common, thin-walled cover 27 is provided, which covers the permanent magnets 21 in the axial and radial directions and, together with the inner surface 201 of the pole house 20, forms a closed space in which all material fragments or pieces are caught.
  • the working air gap 22 is thus hermetically sealed off from the permanent magnets 21, so that no material fragments or pieces of material detaching from the permanent magnets 21 can reach the working air gap 22.
  • the thin-walled cover 27 can be seen in FIG. 2 in perspective and in FIG. 1 in section in its installed position in the stator 11 of the direct current motor. It has a sleeve 28, which engages non-positively on the free surfaces of the permanent magnets 21, and two cover rings 29, 30, which lie with their outer contour on the inner surface 201 of the pole house 20 and overlap the end edges of the sleeve 28.
  • the sleeve 28 is made of non-magnetic material and is preferably rolled from a strip of material. But it can also be designed as a closed ring.
  • the outer diameter of the sleeve 28 is preferably chosen to be somewhat larger than the clear distance between diametrically opposed permanent magnets 21. In the case of permanent magnets 21 which flatten toward the magnetic edge, the clear distance of the diametrical permanent magnets is measured in the magnet center.
  • the sleeve 28 bears against the free surfaces of the permanent magnets 21 under prestress and conforms overall to the magnet contour.
  • Cover ring 29, 30 carries on its sleeve 28 facing End faces an axially projecting collar 291 and 301, on each of which a sleeve end is pushed.
  • each cover ring 29, 30 can also have an annular groove 292 or 302, which is incorporated into the end face of the cover ring 29, 30 facing the sleeve 28, directly adjacent to the collar 291 or 301.
  • the sleeve 28 is then immersed in these annular grooves 292 and 302, each with one end.
  • the cover rings 29, 30, which are fixedly connected to the sleeve 28, are supported on the inner surface 201 of the pole housing 20, the cover ring 30 with its side facing away from the collar 301
  • the invention is not limited to the exemplary embodiment described. At least the separate cover ring 30 can thus be dispensed with, in that the cover ring 30 is made in one piece with the end shield 24, that is to say the collar 301 and possibly the annular groove 302 are formed on the end shield 24, and the sleeve 38 is guided up to the end shield 24 to turn the covenant there
  • the cover ring 30 can be formed as an annular web on the bottom of the pole housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)

Abstract

L'invention concerne une machine électrique excitée par aimants permanents, en particulier un moteur à courant continu pour véhicules, qui comprend un stator multipolaire pourvu d'un logement de pôles annulaire et d'aimants permanents formant les pôles de stator, qui sont disposés dans le sens circonférentiel du logement de pôles, l'un derrière l'autre, et sont collés sur la face intérieur du<sp> </sp>logement de pôles. Pour éviter que de fragments de matière ou des pièces se séparant des aimants permanents pénètrent dans l'entrefer de la machine électrique, il est prévu que, dans le stator, les aimants permanents présentent une partie de recouvrement (27) à paroi mince, dans le sens axial et dans le sens radial. De préférence, cette partie de recouvrement (27) est constituée d'une douille (28) et de deux bagues de recouvrement (29, 30) qui recouvrent les bords faciaux de la douille (28) et s'étendent radialement pour venir au moins contre la face intérieure du logement de pôles.
PCT/DE2002/002211 2001-10-24 2002-06-18 Machine electrique excitee par aimants permanents WO2003038972A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10152502.8 2001-10-24
DE2001152502 DE10152502A1 (de) 2001-10-24 2001-10-24 Permanentmagneterregte elektrische Maschine

Publications (1)

Publication Number Publication Date
WO2003038972A1 true WO2003038972A1 (fr) 2003-05-08

Family

ID=7703581

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DE2002/002211 WO2003038972A1 (fr) 2001-10-24 2002-06-18 Machine electrique excitee par aimants permanents

Country Status (2)

Country Link
DE (1) DE10152502A1 (fr)
WO (1) WO2003038972A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005039884A1 (de) * 2005-08-23 2007-03-08 BSH Bosch und Siemens Hausgeräte GmbH Rotorabdeckung und Elektromotor

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10302454A1 (de) 2003-01-23 2004-07-29 Robert Bosch Gmbh Permanent erregte elektrische Maschine
US20090021099A1 (en) * 2005-04-11 2009-01-22 Pulsed Inertial Electric Motor Pulsed Inertial Electric Motor
DE102010033700B4 (de) 2010-07-30 2022-11-10 Stöber Antriebstechnik GmbH & Co. KG Elektromotor
DE102014007671A1 (de) * 2014-05-27 2015-12-03 Sew-Eurodrive Gmbh & Co Kg Elektromotor mit einem Statorgehäuse

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2738175B1 (de) * 1977-08-24 1978-07-27 Siemens Ag Dauermagneterregte elektrische Maschine
US4665333A (en) * 1985-03-26 1987-05-12 Fag Kugelfischer Georg Schafer (Kgaa) Separator for securing magnets
US4873461A (en) * 1988-05-13 1989-10-10 Stryker Corporation Electric motor sterilizable surgical power tool
US5723929A (en) * 1995-09-19 1998-03-03 Nippondenso Co., Ltd. D.C. Motor with primary and auxiliary magnetic poles

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2738175B1 (de) * 1977-08-24 1978-07-27 Siemens Ag Dauermagneterregte elektrische Maschine
US4665333A (en) * 1985-03-26 1987-05-12 Fag Kugelfischer Georg Schafer (Kgaa) Separator for securing magnets
US4873461A (en) * 1988-05-13 1989-10-10 Stryker Corporation Electric motor sterilizable surgical power tool
US5723929A (en) * 1995-09-19 1998-03-03 Nippondenso Co., Ltd. D.C. Motor with primary and auxiliary magnetic poles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005039884A1 (de) * 2005-08-23 2007-03-08 BSH Bosch und Siemens Hausgeräte GmbH Rotorabdeckung und Elektromotor
US8110958B2 (en) 2005-08-23 2012-02-07 Bsh Bosch Und Siemens Hausgeraete Gmbh Rotor cover with rotor fins extending between stator slots

Also Published As

Publication number Publication date
DE10152502A1 (de) 2003-05-08

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