EP2158662A2 - Moteur à commutation électronique comprenant un stator amélioré - Google Patents

Moteur à commutation électronique comprenant un stator amélioré

Info

Publication number
EP2158662A2
EP2158662A2 EP08760994A EP08760994A EP2158662A2 EP 2158662 A2 EP2158662 A2 EP 2158662A2 EP 08760994 A EP08760994 A EP 08760994A EP 08760994 A EP08760994 A EP 08760994A EP 2158662 A2 EP2158662 A2 EP 2158662A2
Authority
EP
European Patent Office
Prior art keywords
stator
coils
electric motor
strand
motor 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.)
Withdrawn
Application number
EP08760994A
Other languages
German (de)
English (en)
Inventor
Torsten Wilharm
Tilo Koenig
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.)
Robert Bosch GmbH
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 EP2158662A2 publication Critical patent/EP2158662A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K3/00—Details of windings
    • H02K3/04—Windings characterised by the conductor shape, form or construction, e.g. with bar conductors
    • H02K3/28—Layout of windings or of connections between windings

Definitions

  • the invention relates to an electronically commutated electric motor with a stator that is improved over the prior art.
  • Such electric motors are particularly in applications intensified distribution, where it depends on longevity and low wear and compact designs are indispensable.
  • the time required for the operation of such electric motors periodic switching of magnetic field generating coils is no longer done by a mechanical commutator, but by electronic switching devices.
  • For the synchronization of the switching operations is usually the determination of at least one rotor position, wherein the switching operations in coordination with the rotational speed of the rotor are made such that a magnetic rotating field is generated.
  • the rotating field interacts with a magnet-equipped rotor, which sets this in rotation.
  • Each phase has at least one strand for this, which comprises a plurality of coils which are connected in parallel or in series.
  • stator designs with coils arranged on the circumference of the stator, which alternately belong to different strings is often a magnetic coupling between the individual strings, which leads to an effective increase of the inductance.
  • the associated current limit often leads to an unsatisfactory torque output in medium speed ranges.
  • the invention is based on interconnecting the individual coils of the stator so that in each case two coils adjacent to one another directly on the circumference of the stator belong to one and the same strand. This eliminates at least the formation of such pairs of coils otherwise required long connecting elements.
  • Under strand within the meaning of the invention is to be understood as any arrangement of a plurality of coils of the stator, which are energized simultaneously during operation of the electric motor. The nature of the interconnection of these coils is not important.
  • the two adjacent coils of a coil pair are each wound in opposite directions within a strand.
  • This circuit concept can be used with advantage if the individual coils each encompass only one tooth of the stator.
  • the invention thus consists in an electronically commutated electric motor, comprising a stator surrounding a rotor, wherein the stator comprises a plurality of strands, each having at least one coil pair, wherein the coils of this coil pair are arranged adjacent to the circumference of the stator and wound in opposite directions.
  • Stators for the winding or interconnection of individual coils according to the invention accordingly have a number of teeth which can be divided by two and by the number of strands.
  • at least two coil pairs formed according to the invention each belong to one strand, wherein in turn advantageously these at least two coil pairs are diametrically opposed. This results in a particularly good running smoothness executed such electric motors, since the interaction between the rotor and stator generates a pure torque about the axis of rotation of the rotor and vibrations are largely avoided.
  • each case the two coils, which form an adjacent coil pair within a strand, are operated in series. This makes it possible at least to wind through the coils of each coil pair.
  • stators according to the invention it remains the same possible to wind through all the coils of the stator in a winding tube, which represents a significant technological advantage.
  • a delta connection has the advantage over a star connection that with the same available voltage of a supply network, smaller wire thicknesses are required for the winding of the individual coils, which represents a considerable advantage, in particular in the field of motor vehicle electrics, since there with relatively high currents and low voltages is worked and the resulting wire thicknesses are quite high anyway.
  • a reduced wire thickness is of particular interest because it ensures better windability.
  • the number of poles of the rotor slightly higher than the number of coils of the stator. In this case, there is a slight geometric mismatch between the poles of the rotor and the stator, which causes the
  • Electric motors with advantage to comply when a twelve-tooth stator with twelve coils and a fourteen-pole rotor are combined.
  • Fig. 1 is a winding diagram for a stator for operating the electric motor according to the invention in parallel delta connection;
  • FIG. 2 shows a winding diagram for a stator for operating the electric motor according to the invention in a series delta connection
  • FIG. 3 is a sectional view of a stator body of an electronically commutated electric motor according to the invention with inserted rotor;
  • Fig. 4 is a simplified circuit diagram for operating an electric motor according to the invention in delta connection.
  • Fig. 1 shows a winding diagram for a stator for operating the electric motor according to the invention in a parallel delta connection.
  • the individual strands are designated A, B and C.
  • the winding scheme is explained based on a possible winding order.
  • the arrows in the winding diagram show the winding direction and the order of the winding process.
  • the stator is designed as a twelve-toothed stator, which is particularly suitable for the winding scheme according to the invention.
  • the winding takes place in such a way that first tooth 1 and then tooth 2 are wound in opposite directions.
  • the two teeth 1 and 2 then carry a coil pair S1, S2, which belongs to the strand A.
  • tooth 3 and 4 which receive a coil pair S3, S4, which belongs to strand C.
  • the winding sense of the coil pair S3, S4 on the teeth 3 and 4 is opposite to the coil pair S1, S2 on the teeth 1 and 2 reversed.
  • the teeth 5 and 6 which receive a pair of coils S5, S6, which belongs to strand B, wherein the winding sense of the coil pair S5, S6 on the teeth 5 and 6 relative to the coil pair S3, S4 on the teeth 3 and 4 reverses again.
  • the winding scheme shown results in a stator with three strands A, B, C, each having two coil pairs S1, S2; S3, S4 and S5, S6; S7, S8 and S9, S10; S11, S12 include, which are diametrically opposite each other on the circumference of the stator, wherein the individual strands A, B, C are magnetically largely decoupled from each other.
  • each strand is energized via contact elements 13, 14, 15, which act on two respective points between respectively adjacent coil pairs. In this way, there is only one energized pair of coils between two contact points, via which the power supply takes place.
  • the contact elements 13, 14, 15 take over in this embodiment simultaneously the function of connecting elements to bridge the distance between the individual diametrically opposite to the circumference of the stator coil pairs.
  • Fig. 2 shows a winding diagram for a stator for operating the electric motor according to the invention in a series delta connection.
  • the difference to the winding scheme shown in Fig. 1 is that initially all four coils of a strand are wound before changing to the next strand. This is begun in an analogous manner by first tooth 1 and then tooth 2 are wound in opposite directions. The two teeth 1 and 2 then carry a pair of coils S1, S2, that belongs to strand A. Subsequently, the winding wire is guided in a large winding step to the tooth 7. Thereafter, tooth 7 and 8 continue, which pick up a coil pair S7, S8, which also belongs to strand A.
  • tooth 9 and 10 which receive a pair of coils S9, S10, which belongs to strand C.
  • the winding wire is guided in a large winding step to the tooth 3.
  • tooth 3 and 4 which receive a pair of coils S3, S4, which also belongs to strand C.
  • teeth 5 and 6 continue, which receive a pair of coils S5, S6, which belongs to strand B.
  • the winding wire is guided in a large winding step to the tooth 11.
  • teeth 11 and 12 continue, which receive a pair of coils S11, S12, which also belongs to strand B.
  • FIG. 3 shows a sectional view of a stator body 19 of an electronically commutated electric motor according to the invention with inserted rotor 20.
  • the stator body 19 is of radially symmetrical construction and has twelve teeth 1 to 12 which serve to receive coils (not shown), each of which has a tooth of the Stators embrace.
  • a fourteen-pole rotor 20 is arranged in the central region of the stator body 19.
  • the design as a twelve-toothed stator allows the inventive design of three strands, which can be formed according to the previous winding schemes of two opposing coil pairs, wherein the three strands be operated in the form of a triangle circuit.
  • the shape of the stator body 19 is made in a known manner by contouring a stack of so-called electrical sheets.
  • the individual teeth 1 to 12 of the stator body 19 have rotor-side tooth heads 21 which determine the shape of the gap between permanent magnets 22 arranged on the rotor 20 and the teeth 1 to 12 of the stator body.
  • Their widened form opposite to the teeth also ensures effective guidance of the magnetic flux and secure support of the wound on the individual teeth coils.
  • the illustration shows the advantageous geometric mismatch between the poles of the rotor 20 and the 12-tooth stator, which results when the rotor 20 is designed as a fourteen-pole rotor.
  • the permanent magnets 22 located on the rotor 20 are arranged symmetrically in front of a respective tooth head 21, while others are arranged just between two tooth heads 21.
  • the ratio between magnetic poles of the rotor and the number of teeth of the stator in the present example is 7 to 6, wherein the boundary condition of an even number of poles of the rotor at this ratio leads to the minimum number of teeth of 12 for a stator designed according to the invention.
  • the resulting slight geometric mismatch between rotor and stator does not affect the performance of the electric motor of the present invention.
  • the electric motor comprises three strands A, B, C, which are each shown as a simple coil. On the specific embodiment of the interconnection of multiple coils to a strand is not important for the operation of the circuit shown.
  • Power supply 23 provides a required operating voltage.
  • the strand ends of the strands A, B, C are connected via corresponding semiconductor switches T1 to T6 with phases U, V, W, whereby the operation of the erfindungsge- ze H electric motor required rotating field can be generated within inventively ausgestalteter stators.
  • inventively ausgestalteter stators The skilled person will readily understand that the number of strands and phases with a corresponding continuation of the circuit shown, ie an extension to other semiconductor switches and inductors and a corresponding modification of the number of phases dependent synchronization of the required for generating a rotating field switching operations can be varied can.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Windings For Motors And Generators (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne un moteur électrique à commutation électronique, qui comprend un stator entourant un rotor (20). Le stator comporte plusieurs sections (A, B, C) comprenant chacune au moins une paire de bobines (S1, S2; S3, S4; S5, S6), les bobines desdites paires étant disposées à proximité de la périphérie du stator et enroulées en sens contraire.
EP08760994A 2007-06-18 2008-06-13 Moteur à commutation électronique comprenant un stator amélioré Withdrawn EP2158662A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200710027896 DE102007027896A1 (de) 2007-06-18 2007-06-18 Elektronisch kommutierter Motor mit verbessertem Stator
PCT/EP2008/057465 WO2008155293A2 (fr) 2007-06-18 2008-06-13 Moteur à commutation électronique comprenant un stator amélioré

Publications (1)

Publication Number Publication Date
EP2158662A2 true EP2158662A2 (fr) 2010-03-03

Family

ID=40019515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08760994A Withdrawn EP2158662A2 (fr) 2007-06-18 2008-06-13 Moteur à commutation électronique comprenant un stator amélioré

Country Status (3)

Country Link
EP (1) EP2158662A2 (fr)
DE (1) DE102007027896A1 (fr)
WO (1) WO2008155293A2 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010052647A1 (de) * 2010-11-29 2012-05-31 Continental Automotive Gmbh Stator für einen Drehstrom-Elektromotor
DE102020203945A1 (de) 2020-03-26 2021-09-30 Rolls-Royce Deutschland Ltd & Co Kg Statorwicklungssystem mit serieller Spulenwicklung

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0690537A (ja) * 1992-09-08 1994-03-29 Matsushita Electric Ind Co Ltd ブラシレスモータ
EP1602554A2 (fr) * 2004-06-03 2005-12-07 Hitachi, Ltd. Moteur à courant continu sans balai pour direction assistée électrique et procedé de production de celui-ci
US20060022544A1 (en) * 2004-07-30 2006-02-02 Ichinomiya Denki Co., Ltd. Stator and brushless motor
EP1670120A1 (fr) * 2003-09-30 2006-06-14 Valeo Thermal Systems Japan Corporation Moteur electromagnetique

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7247967B2 (en) * 2004-08-09 2007-07-24 A. O. Smith Corporation Electric motor having a stator
DE102004044697B4 (de) * 2004-09-15 2009-02-26 Siemens Ag Synchronmaschine
DE102004055317A1 (de) * 2004-11-16 2006-05-24 Bosch Rexroth Aktiengesellschaft Elektrische Drehfeldmaschine und Primärteil
JP4665595B2 (ja) * 2005-04-28 2011-04-06 トヨタ自動車株式会社 回転電機の巻線構造

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0690537A (ja) * 1992-09-08 1994-03-29 Matsushita Electric Ind Co Ltd ブラシレスモータ
EP1670120A1 (fr) * 2003-09-30 2006-06-14 Valeo Thermal Systems Japan Corporation Moteur electromagnetique
EP1602554A2 (fr) * 2004-06-03 2005-12-07 Hitachi, Ltd. Moteur à courant continu sans balai pour direction assistée électrique et procedé de production de celui-ci
US20060022544A1 (en) * 2004-07-30 2006-02-02 Ichinomiya Denki Co., Ltd. Stator and brushless motor

Also Published As

Publication number Publication date
DE102007027896A1 (de) 2008-12-24
WO2008155293A3 (fr) 2009-03-05
WO2008155293A2 (fr) 2008-12-24

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