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WO2002065616A1 - Piece polaire unitaire de flux axial - Google Patents

Piece polaire unitaire de flux axial Download PDF

Info

Publication number
WO2002065616A1
WO2002065616A1 PCT/CA2001/000633 CA0100633W WO02065616A1 WO 2002065616 A1 WO2002065616 A1 WO 2002065616A1 CA 0100633 W CA0100633 W CA 0100633W WO 02065616 A1 WO02065616 A1 WO 02065616A1
Authority
WO
WIPO (PCT)
Prior art keywords
pole shoe
stator
adjacent
pole
poles
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
PCT/CA2001/000633
Other languages
English (en)
Inventor
Eleazar Felipe Bustamante
David Yan Leng
Tan Tang
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.)
CTS Corp
Original Assignee
CTS Corp
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 CTS Corp filed Critical CTS Corp
Publication of WO2002065616A1 publication Critical patent/WO2002065616A1/fr
Anticipated expiration legal-status Critical
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
    • H02K1/12—Stationary parts of the magnetic circuit
    • H02K1/14—Stator cores with salient poles
    • H02K1/146—Stator cores with salient poles consisting of a generally annular yoke with salient poles
    • H02K1/148—Sectional cores
    • 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
    • H02K1/08—Salient poles

Definitions

  • This invention relates to electric motors and/or actuators.
  • a unitary pole shoe that minimizes flux leakage for an electric motor that replaces multiple pole shoes.
  • Electromechanical rotary actuators and motors that operate with air-gap magnetic flux in the axial direction usually have a soft-magnetic stator with salient poles.
  • the tops of the poles face the air gap that separates the rotor from the stator.
  • the space between consecutive poles is determined by the dimensions of the insulated coils which, when energized with electric current, convert the stator poles into electromagnets.
  • the rotary actuator or motor develops torque that is directly related to the coils' current over a rotation angle that corresponds, approximately, to the arc spanned by one salient pole.
  • a rotation angle that corresponds, approximately, to the arc spanned by one salient pole.
  • individual soft-magnetic "pole shoes” are placed on top of each stator pole. At the air gap, the shoes present an arc that is wider than the arc of the salient poles.
  • pole shoes have to be placed, one over each stator pole, accurately, and then secured in place permanently.
  • Common numbers of pole shoes are 2 and 4, although larger numbers, such as 8 and 10, are also used.
  • the placement and attachment of multiple pole shoes adds complexity and cost to the production of electric motors.
  • pole shoes are not evenly spaced, then the performance of the rotary actuator or motor deteriorates, and the expected useful rotation range may not be possible. For example, pole shoes that are too close to each other favor excessive magnetic leakage between them, thus helping saturate their stator poles with magnetic flux that does not contribute to the development of any rotational torque. The leaking flux also contributes to a more inefficient motor.
  • the pole shoe includes several pole shoe sections, each pole shoe section is mounted adjacent a stator pole.
  • Several bridges join the pole shoe sections. The bridges are located out of a main flux path between any two adjacent stators poles such that flux leakage between the adjacent stator poles is minimized.
  • Fig. 1 is a perspective view of the preferred embodiment of the unitary axial flux pole shoe with a stator.
  • Fig. 2 is a top view of the unitary axial flux pole shoe of figure 1.
  • Fig. 3 is a cross sectional view of figure 2 along section lines A-A.
  • Fig. 4 is a top view of an alternative embodiment of the unitary axial flux pole shoe.
  • a stator assembly 10 has a stator 12 with a unitary pole shoe 30 mounted thereon.
  • Stator assembly 10 is part of a rotary actuator or rotating electric motor.
  • Stator 12 has a base 13 with four stator poles 14 extending therefrom, and a stator cavity 15.
  • Stator gaps 16 are located between the stator poles 14.
  • Holes 17 are located at the top of poles 14.
  • Holes 17 receive fasteners 24 to attach pole shoe 30 to stator 12.
  • Several recesses 18 are located on the stator poles 18 to help align and secure pole shoe 30.
  • Stator 12 is preferably formed from a sintered powdered metal.
  • a wire winding 20 is wound around stator pole 14.
  • An electrical potential is applied to winding 20 in order to generate a flux field 22 extending axially to the stator poles in the direction shown by the arrows in figure 1.
  • the flux field 22 acts upon a rotor (not shown) that contains magnets.
  • the flux field causes an opposing field on the magnet to be biased away from the poles and to cause the rotor to rotate.
  • the stator poles generate flux 22 that moves perpendicular to the plane of the pole shoe 30.
  • Disc shaped pole shoe 30 has four quarter circle shaped sections 32.
  • Pole shoe 30 is preferably stamped from conventional carbon steel sheet metal. Prior art pole shoes are formed by pressing and sintering powdered metal.
  • the pole shoe 30 is mounted on stator 12.
  • Each pole shoe section 32 is mounted adjacent a stator pole 14.
  • Bridges 34 are formed between sections 32 and link the pole shoe sections together.
  • the bridges 32 are located out of the main flux path between any two adjacent stators poles such that flux leakage between the adjacent stator poles is minimized.
  • the sections 32 define a slot 35 between adjacent sections.
  • a shaft aperture 36 passes through the center of the pole shoe 30.
  • a shaft (not shown) would pass through aperture 36.
  • Several notches 38 are located on an inner circumferential surface 40 adjacent aperture 36.
  • notches 38 The purpose of notches 38 is to reduce the cross-section of bridges 34.
  • Several outer alignment notches 42 are located on an outer circumferential surface 48.
  • Chamfered holes 44 allow fasteners 24 to pass through.
  • the alignment notches facilitate accurate and fast assembly of the rotary actuator.
  • a thrust bearing support 46 is formed around the aperture.
  • the thrust bearing support 46 carries a thrust bearing (not shown) that supports the shaft.
  • the present invention allows the prior art multiple set of pole shoes to be replaced by one single or unitary part, preferably one stamped out of sheet-metal.
  • the unitary pole shoe incorporates the individual pole shoes that are joined by bridges and also incorporates a thrust bearing support. These bridges have to be relatively thin and out of the main path of flux that links two consecutive poles. This avoids the problem of excessive flux leakage between adjacent pole shoes that are too close.
  • pole shoe was shown fastened to the stator poles with screws, other fastening methods can also be used.
  • the pole shoe can be welded to the stator pole or can be attached with rivets or an adhesive.
  • the assembly is greatly simplified because there is only one single pole shoe to be positioned instead of 2, 4, 6, 8, 10, etc. individual pole shoes.
  • the stamped part can incorporate features on its outer and inner edges that help the mechanical assembly of the rotary actuator or motor while locating the pole piece on the stator and or while locating the actuator housing around the pole shoe.
  • a concave “thrust bearing support” can be formed at the center of the stamped part, thus incorporating what normally is another separate component of the actuator or motor.
  • Pole shoe 60 is similar to pole shoe 30 except that the bridges 62 are oriented diagonally between the pole shoe sections 32. Bridges 62 form an inner slot 64 and an outer slot 66. The bridges 62 connect the pole shoe sections 32, while at the same time being located out of the main flux path so as to minimize flux leakage.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)

Abstract

L'invention concerne une pièce polaire unitaire permettant de monter de manière adjacente un stator dans un moteur électrique. La pièce polaire comporte plusieurs sections de pole. Chaque section de pole est montée de manière adjacente à un pôle de stator. Plusieurs ponts rejoignent les sections de pièce polaire. Les ponts sont placés en dehors d'un passage de flux principal entre deux pôles de stator adjacents, de manière à ce que la fuite de flux entre les pôles de stator adjacents soit réduite au minimum.
PCT/CA2001/000633 2001-02-14 2001-05-04 Piece polaire unitaire de flux axial Ceased WO2002065616A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA2,336,514 2001-02-14
CA 2336514 CA2336514A1 (fr) 2001-02-14 2001-02-14 Piece polaire a flux axial unitaire

Publications (1)

Publication Number Publication Date
WO2002065616A1 true WO2002065616A1 (fr) 2002-08-22

Family

ID=4168366

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2001/000633 Ceased WO2002065616A1 (fr) 2001-02-14 2001-05-04 Piece polaire unitaire de flux axial

Country Status (2)

Country Link
CA (1) CA2336514A1 (fr)
WO (1) WO2002065616A1 (fr)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7557482B2 (en) 2006-07-31 2009-07-07 Caterpillar Inc. Axial-flux electric machine
CN111725908A (zh) * 2019-03-19 2020-09-29 上海盘毂动力科技股份有限公司 一种定子组件以及轴向磁场电机
GB2605560A (en) * 2021-01-22 2022-10-12 Yasa Ltd Stator assembly flux alignment
US12095320B2 (en) 2022-06-27 2024-09-17 Anthropocene Institute LLC Axial flux switched reluctance and inductance state machine systems, devices, and methods
US12149134B2 (en) * 2022-06-27 2024-11-19 Anthropocene Institute LLC Axial flux switched reluctance motor and generator, and related systems and methods

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5089730A (en) * 1990-05-18 1992-02-18 North American Philips Corporation Low noise DC electric motor
US5801473A (en) * 1994-09-20 1998-09-01 Queensland Rail Open stator axial flux electric motor
DE19756575A1 (de) * 1997-12-18 1999-07-01 Siemens Ag Elektromotor
WO2000064035A1 (fr) * 1999-04-15 2000-10-26 R.C.V. S.R.L. Moteur sans balais a entrefer axial et son procede de fabrication

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5089730A (en) * 1990-05-18 1992-02-18 North American Philips Corporation Low noise DC electric motor
US5801473A (en) * 1994-09-20 1998-09-01 Queensland Rail Open stator axial flux electric motor
DE19756575A1 (de) * 1997-12-18 1999-07-01 Siemens Ag Elektromotor
WO2000064035A1 (fr) * 1999-04-15 2000-10-26 R.C.V. S.R.L. Moteur sans balais a entrefer axial et son procede de fabrication

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7557482B2 (en) 2006-07-31 2009-07-07 Caterpillar Inc. Axial-flux electric machine
CN111725908A (zh) * 2019-03-19 2020-09-29 上海盘毂动力科技股份有限公司 一种定子组件以及轴向磁场电机
GB2605560A (en) * 2021-01-22 2022-10-12 Yasa Ltd Stator assembly flux alignment
GB2605560B (en) * 2021-01-22 2023-05-10 Yasa Ltd Stator assembly flux alignment
US12057749B2 (en) 2021-01-22 2024-08-06 Yasa Limited Stator assembly flux alignment
US12095320B2 (en) 2022-06-27 2024-09-17 Anthropocene Institute LLC Axial flux switched reluctance and inductance state machine systems, devices, and methods
US12149134B2 (en) * 2022-06-27 2024-11-19 Anthropocene Institute LLC Axial flux switched reluctance motor and generator, and related systems and methods

Also Published As

Publication number Publication date
CA2336514A1 (fr) 2002-08-14

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