EP1982401A1 - Machine électrique - Google Patents

Machine électrique

Info

Publication number
EP1982401A1
EP1982401A1 EP07703915A EP07703915A EP1982401A1 EP 1982401 A1 EP1982401 A1 EP 1982401A1 EP 07703915 A EP07703915 A EP 07703915A EP 07703915 A EP07703915 A EP 07703915A EP 1982401 A1 EP1982401 A1 EP 1982401A1
Authority
EP
European Patent Office
Prior art keywords
stator
electrical machine
permanent magnets
rotor
magnets
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.)
Withdrawn
Application number
EP07703915A
Other languages
German (de)
English (en)
Inventor
Jacek Junak
Grzegorz Ombach
Ansgar Ackva
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.)
Brose Fahrzeugteile SE and Co KG
Original Assignee
Continental Automotive 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 Continental Automotive GmbH filed Critical Continental Automotive GmbH
Publication of EP1982401A1 publication Critical patent/EP1982401A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K23/00—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors
    • H02K23/02—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting
    • H02K23/04—DC commutator motors or generators having mechanical commutator; Universal AC/DC commutator motors characterised by arrangement for exciting having permanent magnet excitation
    • 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 relates to an electrical machine with a
  • the invention relates to a brushed DC motor in which the stator has permanent magnets.
  • rare earth magnets are often used instead of ferrite magnets because of their better magnetic properties.
  • cup-shaped (arc-shaped) rare earth magnets is known.
  • these are attached directly to the yoke of the DC motor, for example by means of an adhesive or clamp connection.
  • An object of the present invention is therefore to find a solution in which cuboidal magnets can be used in the stator of an electric machine without resulting in a deterioration of the power.
  • the stator has a number of cuboid permanent magnets embedded in pockets whose axial length is greater than the axial length of the stator.
  • a key idea of the invention is to use embedded in pockets, cuboid permanent magnets, which protrude axially beyond the stator. In other words, the permanent magnets have an overhang. This overhang leads to a reduction of the magnetic leakage flux in the axial direction
  • the electrical machine in the electrical machine is a bürstenbehaf ⁇ ended DC motor.
  • the advantages of the invention appear in this case particularly strong.
  • the invention is suitable for DC motors having an im
  • the permanent magnets project beyond the stator on both sides.
  • a particularly favorable distribution of magneti ⁇ rule flow to achieve is preferably selected a SYMMETRI ⁇ specific arrangement, that the overhang on both sides of the stand the same size.
  • the stator has a number of pole shoes corresponding to the number of permanent magnets, each of which has two Webs are connected to a yoke and form between them and the yoke, the pockets for receiving the permanent magnets.
  • the thickness of the webs is preferably so small that the mechanical strength of the construction is still just guaranteed. Thus, the magnetic leakage losses can be minimized.
  • Pole shoes and yoke are in other words integrally formed.
  • the pockets preferably run in the axial direction from one side of the upright to the opposite side of the upright and are symmetrical to the respective pole shoes.
  • the inner contour of the pole shoes pointing in the direction of the runner forms a substantially constant air gap between the stator and the rotor. This is achieved by the special shape of the pole pieces.
  • the larger distance of the edges of the cuboid permanent magnets to the rotor is compensated by the shape of the pole shoes, i. In these areas, the thickness of the pole pieces is significantly greater than in the middle region of the pole pieces.
  • the distance from the parallelepiped-shaped permanent magnets to the rotor is in the middle region of the pole pieces, ie in the region of the permanent magnet center, the lowest.
  • the thickness of the pole pieces in other words in the middle of the permanent magnet ⁇ lowest.
  • the thickness is the pole ⁇ shoes in the middle of the permanent magnet so low that the mechanical strength of the construction just ge ⁇ is ensured.
  • a great advantage of this embodiment of the stand according to the invention is that they sign does not lead to a significant increase of motor diameter in comparison to a similar De ⁇ with arc-shaped permanent magnet. At the same time ensures this embodiment, a uniform distribution of the demagnetization forces over the magnets, that is, in comparison to configurations with cup-shaped magnets may properties with the invention the permanent magnets with poorer Materialei ⁇ , in particular with lower values of the coercitive tivfeidschreib HcJ, are used.
  • the stator consists of a laminated core. This includes a number of layered stamped sheets.
  • the stator plates are held together, for example by welding or brackets or tie rods, which extend in channels of the stator core.
  • the shape of the individual stator plates are held together, for example by welding or brackets or tie rods, which extend in channels of the stator core.
  • Stator plates is chosen such that in the installed to stand ⁇ resulting nentmagnete described above via webs to the yoke associated pole pieces and thus the pockets for receiving the Perma ⁇ .
  • the rotor and the stator have substantially the same length. If runners and stands are manufactured as sheet metal stacks from stamped sheets, the production can be carried out particularly effectively and in a material-saving way. Dar ⁇ beyond resulting from electrical or magnetic advantages.
  • the permanent magnets are rare-earth magnets which have improved magnetic properties in comparison to ferrite magnets. Due to the higher Manenz larger magnetic field strengths can be achieved, so that the engine can be made smaller overall.
  • rare earth magnets are meant magnets of rare earth magnetic materials, such as plastic bonded materials.
  • FIG. 1 shows a DC motor according to the invention with stator and rotor in a front view
  • FIG. 2 shows a part of the yoke of the DC motor from FIG. 1 with a pole shoe in a side view
  • FIG. 3 shows the stator of the DC motor from FIG. 1 with embedded permanent magnets in a perspective view
  • FIG. 4 shows the stand of Figure 3 in a further perspective view.
  • the brushed DC motor 1 has a rotor 2 and a stator 3 of the same axial length 4. In this case, the length 4 is small compared to the diameter of the DC motor 1.
  • the rotor 2 rotates in the interior of the stator 3 about a rotation axis 5.
  • the rotor 2 has a winding (not shown), which from a DC power source via brushes (both not shown) is supplied.
  • the winding is located in the axial grooves 27 which are arranged between the teeth 26 of the rotor 2.
  • the stand 3 consists essentially of a laminated core with a plurality of punched sheets (not shown in detail), the one another by tie rods (also not pictured).
  • the shape of the individual stator plates is chosen such that in the mounted (stacked) state, the stand ⁇ design described below is obtained.
  • the stator 3 comprises four parallelepiped permanent magnets 6 which are embedded the stator 3 in the pockets 7 and form ei ⁇ ne four-pole magnet arrangement.
  • the four stator poles are offset by 90 ° to each other.
  • the permanent magnets 6 are radially magnetized rare earth magnets, for example based on NeFeB or SmCo.
  • the axial length 8 of the permanent magnets 6 is greater than the axial length 4 of the stator 3.
  • the permanent magnets 6 have an overhang 11 in the axial direction 9.
  • the permanent magnets 6 project beyond the stator 3 on both sides.
  • the overhang 11 is on both sides 14, 15 of the stator 3 is the same size and in each case about 5 percent of the total length of permanent magnets ⁇ th. 6
  • the stator 3 has four pole shoes 12, which are connected via two webs 13 to the yoke 16 and between them and the yoke 16, the pockets 7 for receiving the permanent magnet 6 form.
  • the thickness of the webs 13 is so small that the mechanical strength of the construc ⁇ tion is just guaranteed.
  • the yoke 16 extends in these sections of the stator 3 in a straight line.
  • the pockets 7 extend in the axial direction 9 from one side 14 of the stator 3 to the opposite side 15 of the stator 3 and are symmetrical to the respective pole shoes 12. This means that the pocket center 17 and so ⁇ with the center 18 of the in the pocket 7 held perma- Magnets 6 of the middle 19 of the respective pole piece 12 is assigned.
  • the air gap 22 has a substantially constant width, in the present case about 1.3 mm. In other words, the distance from the inner contour 21 of the pole shoes 12 to the rotor 2 is substantially constant.
  • the radial thickness 24 of the pole pieces 12 is lowest in the middle 17, 18, 19. Thus, in this area, the distance from the cuboid permanent magnet 6 to the rotor 2 is minimal.
  • the radial thickness 24 of the pole pieces 12 in the middle 17, 18, 19 is so small here is that the mechanical strength of the construction ⁇ African is just still ensured.
  • the greater distance of the edges 23 of the cuboid permanent magnets 6 to the rotor 2 is compensated by the shape of the pole shoes 12 ⁇ .
  • the radial thickness 25 of the pole shoes 12 is significantly greater in these areas than in the central region of the pole pieces 12, so that the distance to the rotor 2 is bridged with iron material. This ensures an undisturbed magnetic flux and thus higher motor torques. From the central region to the edge regions of the pole shoes 12, the radial thickness and thus the distance between the permanent magnets 6 and the rotor 2 changes continuously.
  • the embodiment described provides for low-cost block-shaped, embedded rare earth permanent magnets have a comparison with the prior art significantly increased motor power in a relatively small size of the Gleichstrommo- tors 1 by the permanent magnets 6 have an axial overhang 11 and at the same time the radial thickness 23 in the mid same ⁇ rich 19 of the pole pieces 12 is reduced. Both the overhang 11 of the permanent magnets 6 and the special shape of the pole pieces 12 ensure a reduction of the magnetic leakage losses and secure in combination a significantly improved engine performance.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Permanent Field Magnets Of Synchronous Machinery (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne une machine électrique (1) constituée d'un stator (3), d'un rotor (2) et d'un certain nombre d'aimants permanents (6). L'objectif de cette invention est de permettre l'utilisation d'aimants permanents parallélépipédiques (6) sans qu'une réduction de puissance ne soit provoquée. A cet effet, le stator (3) présente un certain nombre d'aimants permanents parallélépipédiques (6) insérés dans des poches (7), aimants dont la longueur axiale (8) est supérieure à la longueur axiale (4) du stator (3).
EP07703915A 2006-02-01 2007-01-16 Machine électrique Withdrawn EP1982401A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006004607 2006-02-01
PCT/EP2007/050405 WO2007088101A1 (fr) 2006-02-01 2007-01-16 Machine électrique

Publications (1)

Publication Number Publication Date
EP1982401A1 true EP1982401A1 (fr) 2008-10-22

Family

ID=37882273

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07703915A Withdrawn EP1982401A1 (fr) 2006-02-01 2007-01-16 Machine électrique

Country Status (5)

Country Link
US (1) US8008824B2 (fr)
EP (1) EP1982401A1 (fr)
CN (1) CN101379676A (fr)
BR (1) BRPI0707353A2 (fr)
WO (1) WO2007088101A1 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010043977A1 (de) * 2010-11-16 2012-05-16 Robert Bosch Gmbh Elektromotor mit verbessertem Magnethalterring, sowie ein Verfahren zur Herstellung des Magnethalterrings
US20130162068A1 (en) * 2011-12-22 2013-06-27 Black & Decker Inc. Overmolded stator assembly lamination stack for a power tool
EP3410581B1 (fr) * 2013-03-22 2022-01-19 Mitsuba Corporation Appareil formant moteur
DE102017223042A1 (de) * 2017-12-18 2019-06-19 Volkswagen Aktiengesellschaft Rotor- oder Statoranordnung mit Permanentmagneten

Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3296471A (en) * 1963-08-16 1967-01-03 Cochardt Alexander Dynamoelectric machine
DE1964899A1 (de) 1969-12-24 1971-07-01 Licentia Gmbh Durch Dauermagnete erregte Gleichstrommaschine
US4023057A (en) * 1974-03-22 1977-05-10 Pacific Textile & Chemical Corporation Electric motor field magnets
US4110645A (en) * 1976-02-23 1978-08-29 Vibrac Corporation Electric motor
DE2721019A1 (de) 1977-05-10 1978-11-16 Siemens Ag Geblechtes staenderjoch fuer elektrische maschinen
FR2503948A3 (fr) 1981-04-09 1982-10-15 Ducellier & Cie Petit moteur electrique pour l'equipement de vehicules automobiles
JP2594922B2 (ja) 1986-11-05 1997-03-26 株式会社日立製作所 永久磁石界磁式電動機の運転方法
JPS63187580U (fr) * 1987-05-22 1988-12-01
GB8724000D0 (en) 1987-10-13 1987-11-18 Lucas Ind Plc Permanent magnet machines
JPH0757072B2 (ja) 1989-02-13 1995-06-14 本田技研工業株式会社 永久磁石回転機
US5672925A (en) * 1992-08-06 1997-09-30 Electric Power Research Institute, Inc. Doubly salient variable reluctance machine with stationary permanent magnets or auxiliary field windings
JP3347890B2 (ja) 1994-09-16 2002-11-20 三菱電機株式会社 直流電動機
US5796190A (en) * 1995-05-29 1998-08-18 Denyo Kabushiki Kaisha Engine-driven permanent magnetic type welding generator
DE19861024A1 (de) 1998-02-28 1999-09-09 Bosch Gmbh Robert Elektromotor
JP2003230234A (ja) 2002-01-28 2003-08-15 Onsei Kigyo Kofun Yugenkoshi 永久磁石式直流ブラシモータ

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2007088101A1 *

Also Published As

Publication number Publication date
US8008824B2 (en) 2011-08-30
US20090102303A1 (en) 2009-04-23
CN101379676A (zh) 2009-03-04
WO2007088101A1 (fr) 2007-08-09
BRPI0707353A2 (pt) 2011-05-03

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