US3828211A - Tubular inductor structure for linear motors - Google Patents

Tubular inductor structure for linear motors Download PDF

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Publication number
US3828211A
US3828211A US00381448A US38144873A US3828211A US 3828211 A US3828211 A US 3828211A US 00381448 A US00381448 A US 00381448A US 38144873 A US38144873 A US 38144873A US 3828211 A US3828211 A US 3828211A
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United States
Prior art keywords
sheets
inductor component
electric motor
annular
sheet
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Expired - Lifetime
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US00381448A
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English (en)
Inventor
J Laronze
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BBC Brown Boveri AG Switzerland
BBC Brown Boveri France SA
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BBC Brown Boveri France SA
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/025—Asynchronous motors

Definitions

  • the outer portions of the sheets may also be notched to establish one or more [56] References C'ted longitudinally spaced peripheral grooves within which UNITED STATES PATENTS a strand of solder, or ferrule or wire binding is located 662,928 12/1900 Geisnlioner 310/65 so as to bind the Sheets together. Bearings for support- 3,435,262 3/1969 Bennett et al. ing the rotor can be mounted at the radially inner por- 3,599.020 8/1971 Harris et al.
  • the coils are located in transverse planes and therefore the flux circulates in longitudinal planes through the motor axis.
  • a magnetic circuit division ensues, in order to avoid eddy currents, which ordinarily also should be in longitudinal planes. In other words, this circuit should be laminated longitudinally.
  • this cannot be directly implemented because the longitudinal separating planes through the axis are not parallel and therefore do not lend themselves to the conventional solution of merely superposing sheets of regular thickness. Therefore it is generally preferred to achieve division along the transverse planes which, though definitely less advantageous, on the other hand eliminates all complications.
  • the present invention on the other hand aims to achieve a longitudinally laminated magnetic circuit without encountering any particular difficulty in so doing and by means of conventional sheets of constant thickness and for a tubular inductor of the kind mentioned and which will be compact with respect to diameter and for which the connections to the windings will present no problems at all, and which may be easily cooled.
  • the magnetic circuit is achieved by the juxtaposition of flat sheets with edges notched in known fashion, the opposite edges of at least some of these being so formed as to be of larger transverse size than the thickness of the sheets being considered.
  • juxtaposition of the sheets causes a hollow cylindrical volume in the inner part of which there will be a series of housings suitable to seat circular coils, whereas the small spaces separating the successive sheets maybe used for housing the means for connections and/or for passing coolmg air.
  • edge shaping is achieved by folding back in such manner that a laterally offset edge will be obtained, which is amenable to being oriented with respect to the plane of the non-deformed sheet at such an angle as to be in a plane essentially radial with respect to the cylinder finally obtained.
  • the flat sheets may advantageously be radially protruding so as to constitute cooling fins.
  • the sheets must bepreviously mounted on the windings because the final cylindrical shape of the circuit will prohibit any subsequent assembly.
  • the operation may be achieved by means of a coil-former suitable for coil and sheet centering.
  • the magnetic circuit built up as described above be provided with bearings suitable to assure sliding guidance of the motor armature.
  • bearings may be fastened to the end-shields fastened to the magnetic circuit or to the frame surrounding same.
  • the bearings also may be made of plastic with low coefficient of friction and be mounted in the magnetic circuit, notably in the manner of annular closing chocks for certain of the circuit notches. Such bearings also may be fastened by glueing or otherwise to the individual coil supports of the windings, or they may consist of the very base of that support. In any event, following inductor assembly, it will be enough to pass a broach through it in order to ream and center the bearings.
  • FIG. 1 shows a sheet for the construction of the magnetic circuit of a field of tubular shape in conformity with the invention, following notching at one edge of the sheet but prior to flanging of the opposite edge.
  • FIG. 2 is a perspective of the sheet of FIG. 1 after flanging of its notch-free longitudinal edge.
  • FIG. 3 is a front-view showing the juxtaposition of sheets of FIG. 2 in order to achieve a magnetic circuit for a tubular inductor.
  • FIG. 4 is a perspective with a fragmentary view showing the linear motor with a tubular inductor of FIG. 3.
  • FIG. 5 is similar to FIG. 3 but includes a variation.
  • FIGS. 6 and 7 are transverse sections showing the juxtaposition of radially oriented sheets with respect to a common axis, there being no flanging for the sheets of FIG. 6, while FIG. 7 shows flanging in conformity with the invention.
  • FIG. 8 is a partial side-view of an embodiment wherein the sheets are notched at their flanged edges so as to achieve circular grooves on the circumference of the inductor after assembly.
  • FIG. 9 shows a sheet before flanging, the edge opposite the notches having stamped apertures so as to achieve the grooves of FIG. 8.
  • FIG. 10 shows the same sheet upon being folded back.
  • FIG. 1 is similar to FIG. 8 but with the addition of the grooves having been filled with weld beads.
  • FIG. 12 is a section through a variation in which each groove is provided with a tightening loop.
  • FIGS. 13 and 14 show two variations in the method of shaping the edges opposite the notches.
  • FIGS. 15 through 19 are partial longitudinal sections showing various bearings for a linear motor comprising a tubular inductor in conformity with the invention.
  • a flat sheet 1 is shown in the shape of an elongated rectangle, with notches 2 to house the motor windings in the known manner of linear motors with flat armatures, these notchesdetermining intermediate teeth 3 between them.
  • the thickness of sheet 1 is constantand the material is suitably magnetic.
  • the notchfree longitudinal edge 4 is folded back twice, each time by about and around the two longitudinal axes A-A and 8-8 so as to form a flange 5, FIG. 2, which is laterally offset with respect to the initial plane of sheet 1.
  • e is the initial thickness of the sheet, d the inner diameter of the cylinder (d and if D is the outer diameter (D 2(b+c)), one will have D/d a/e Because a must always not be less than 2e, D/d never may be less than 2 for this kind of folding.
  • the sheets 1 will be juxtaposed on a suitable mandrel on which the windings 6, FIG. 4, to be incorporated in the motor have been mounted, so that these automatically will be emplaced inside the finished inductor.
  • the entirety may thereupon be impregnated or encapsulated in thermosetting or thermoplastic material 7, which thereby will ensure the entiretys fastening and solidification.
  • Completion of the assembly will be obtained by mounting end shields 8 with bearings 9 supporting in gliding fashion armature 10, said endshields possibly being such as to encase sheets 1 and to retain the same radially.
  • the armature proper may be of any suitable kind. In particular, it may consist of a ferromagnetic core 11 on which is mounted a tube 12 made of copper or any other good metallic conductor.
  • Fastening of end-shields 8 may be performed in any suitable manner.
  • the inductor may be enclosed in a metallic shell at the ends of which the shields will be held by screws, bolts, rivets or in any other manner.
  • each sheet is oriented in a plane parallel to that of the non-folded side of the next sheet, against which it will then lie perfectly flat and thereby improve stability.
  • the cylinder constituted by sheets 1 is discontinuous in the meaning of comprising longitudinal spaces between successive sheets. Their presence actually is an advantage because they allow passage to connections which otherwise would require boreholes difficult to achieve. Furthermore they facilitate ventilation.
  • FIG. 5 shows a variation in which an intermediate sheet 1' with non-folded edges is inserted between two sheets with flanged edges.
  • This intermediate sheet therefore protrudes radially and, during the encapsulating operation, the projections may be allowed to extend beyond the insulation coating so as to act as a cooling fin.
  • the continuity of the peripheral sheathing may be ensured by providing for suitable perforations or notches in said projecting part that will allow interconnecting the successive segments of said sheathing.
  • this entirety may be surrounded by a shell for which the spaces between said protruding parts of the sheets 1 then would act as ventilation ducts.
  • FIGS. 6 and 7 emphasize a characteristic already visible in FIG. 6. If a sheet with a non-flanged edge, or with an edge yet to be flanged, is considered, the height f of the iron from the bottom of the notches 2 to the opposite edge 4 determines the useful segment as regards closing the flux circuit between two successive teeth 3.
  • the field source radial thickness would be B, FIG. 6. But because of flanging, the dimension f becomes f, FIG. 7, and the radial thickness therefore is reduced to without thereby reducing concomitantly the useful iron segment between two successive teeth, thereby reducing the outer diameter and obviously representing an advantage with respect to bulk, at least with respect to the embodiment of FIG. 4 which lacks projecting sheets 1'.
  • FIGS. 8 through It show another mode of assembly of the juxtaposed sheets on the assembly mandrel.
  • each sheet I is provided with a series of punched apertures la, FIG. 9, near its edge 4, which intersect the folding axes A and B.
  • FIG. ll Once edge 4 has been folded, FIG. ll), these notches will form hollows which will give rise to the peripheral grooves lb upon assembly at mandrel 10, FIG. 8, said grooves allowing deposition of a weld bead offset from the outer surface, FIG. 11.
  • This weld bead thus may be entirely submerged and non-protruding. It allows sheet assembly independently of any encapsulating and of the very end-shields 8, which may be dispensed with by providing for the bearings inside the inductor in such manner as will be explained below.
  • a variation allows housing a suitable binding means such as is shown in FIG. 12 by the reference 13a in lieu of a weld bead; such a binding means may be a band, ferrule, a collar, or a metal wire winding, etc.
  • sheet assembly may be achieved by welding along the successive joints of the juxtaposed sheets.
  • FIG. 13 shows a variation in the way to flange the sheet edges.
  • Each of the sheets is provided with a longitudinal rib 10 near said edges, said rib projecting on one side.
  • FIG. 14 shows a variation in which each sheet 1 comprises two opposite ribs 1d and 1e, whereby all sheets may be kept apart from one another between the inner periphery of the inductor and the ribs.
  • the bearings 9 of armature 10 have been shown as being of one piece with the endshields 8. Now it may be advantageous to make use of plastic bearings with low friction coefficients (nylon, polytetrafluoroethylene). In such a case the bearings may be directly force-fitted against the end of the magnetic circuit as shown in FIG. 15 where such a bearing is referenced by 14; in order to allow its assembly, sheets 1, or 1, are each provided at their ends with a notch 1f of suitable diameter so as to achieve a bearing housing.
  • plastic bearings with low friction coefficients nylon, polytetrafluoroethylene
  • FIG. 16 shows a variation wherein the notch, which in this instance is referenced as lg, does not end facing the magnetic circuit.
  • bearing 15 must be first so placed on the sheet assembly mandrel as to be encased in the overall assembly.
  • FIG. 17 shows yet another embodiment in which bearings for the sliding support of armature are in the form of annular chocks 16 for closing certain of the notches 2.
  • the concerned windings are mounted on the chocks which themselves were first placed on the assembly mandrel. Once assembly has been completed, and the chocks and windings have been properly impregnated, both the latter will form a mass which is rigidly connected to the magnetic shell and in which the armature 10 may easily slide.
  • one may provide an arbitrary number of chocks 16 within the limit of the number of notches 2. It will suffice to put a reamer or a spindle through the set of chocks 16 so as to ensure their centering along the axis of the armature.
  • FIG. 18 shows an arrangement deriving from the previous one.
  • each winding 6 is on an annular insulating spool 17 with which it is to be mounted inside a notch 2.
  • a ring 18 of a material suitable to form a bearing is glued into the opening of that spoolsupport. It will be clear by inspection that ring 18, which also may be of minor thickness, might be made integral with the base of support 17 if the latter is made of an insulating material with the proper friction properties.
  • FIGS. 13 through 18 allow dispensing with the endshields such as 8 or reducing their function to shielding off dust or other foreign bodies.
  • FIG. 19 shows an arrangement in which a bearing is force-fitted into a central opening 8a provided in each end-shield 8.
  • each bearing is constituted by a plastic sleeve 19 insert.
  • the magnetic shell constituted by the assembly of the sheets 1 and the windings 6, is assumed surrounded by a frame comprising a cylindrical sheath 20 to which are rigidly mounted cooling fins 21.
  • This frame protrudes somewhat beyond the sheets 1 so as to define a centering space for the shields 8.
  • the latter may be fastened to the frame by any appropriate means such as a force-fitted assembly, by tightening tie rods so as to press these shields against the frame, or radial screws through the frame and gripping shield shoulders, etc.
  • annular inductor component for an electric motor of the linear type as defined in claim 1 wherein the deformations in the radially outer portions of said sheets are established by a double consecutive folding of the outer edge portions thereof.
  • annular inductor component for an electric motor of the linear type as defined in claim 3 wherein each sheet is provided with two radially spaced ribs facing in opposite directions from the plane of the sheet.
  • annular inductor component for an electric motor of the linear type as defined in claim 1 wherein the radially outer portions of said sheets are provided with identically located notches which establish a peripheral groove in said sheet assembly, and means engaged in said groove for securing said sheets together in their assembled relation.
  • a binding device such as a metallic band, a non-metallic band, a shrinking ring, a ferrule, a collar or wire binding.
  • annular inductor component for an electric motor of the linear type as described in claim 1 wherein some of said motor windings are located on annular spools of insulating material disposed in said notches provided at the inner edges of said sheets, and a ring of bearing material seated in the opening within each said spool and which establishes a sleeve type bearing for the motor armature.
  • annular inductor component for an electric motor as defined in claim 11 wherein said annular spools are made of suitable insulating and friction material, and their inner bores serve as sleeve bearings.
  • annular inductor component for an electric motor of the linear type as defined in claim 1 wherein the inner edges of said sheets are provided with additional notches at the opposite ends thereof to establish circumferential recesses in which sleeve type bearings for said armature are seated.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Linear Motors (AREA)
  • Iron Core Of Rotating Electric Machines (AREA)
  • Manufacture Of Motors, Generators (AREA)
US00381448A 1972-07-28 1973-07-23 Tubular inductor structure for linear motors Expired - Lifetime US3828211A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7227956A FR2202394B1 (it) 1972-07-28 1972-07-28

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US (1) US3828211A (it)
JP (1) JPS4985510A (it)
BR (1) BR7305695D0 (it)
CH (1) CH554102A (it)
DE (1) DE2334178A1 (it)
FR (1) FR2202394B1 (it)
GB (1) GB1427083A (it)
IT (1) IT992705B (it)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206373A (en) * 1978-02-21 1980-06-03 Exxon Research & Engineering Co. Linear electric motor
US4642493A (en) * 1985-04-25 1987-02-10 Urban Transportation Development Corporation Ltd. Integrally air cooled linear induction motor
US20010033110A1 (en) * 2000-02-10 2001-10-25 Robert Pulford Linear stepper motor and fixture for the magnetization of the shaft thereof and methods
WO2002095906A1 (en) * 2001-05-22 2002-11-28 Empresa Brasileira De Compressores S/A.-Embraco Lamination and lamination arrangement for a linear motor
US20050006959A1 (en) * 2003-07-01 2005-01-13 Siemens Aktiengesellschaft Polygonal structure of a linear motor with ring winding
WO2006075147A1 (en) * 2005-01-11 2006-07-20 Trident Energy Limited Improvements to tubular electrical generators
US20060218790A1 (en) * 2004-01-23 2006-10-05 The Boeing Company Electromagnet having spacer for facilitating cooling and associated cooling method
US20070085440A1 (en) * 2004-10-28 2007-04-19 Siemens Aktiengesellschaft Laminations with integrated spacing feature for an electric machine, and method of making a lamination
US20070249127A1 (en) * 2006-04-24 2007-10-25 Freescale Semiconductor, Inc. Electronic device including a semiconductor layer and a sidewall spacer and a process of forming the same
CN100533930C (zh) * 2004-06-09 2009-08-26 乐金电子(天津)电器有限公司 直线电机定子固定结构
US20100225179A1 (en) * 2006-12-20 2010-09-09 Kulicke And Soffa Industries, Inc. Linear motor with reduced cogging
US20150132161A1 (en) * 2012-11-07 2015-05-14 Haier Group Corporation Stator of linear compressor and fixing method thereof, linear motor, and linear compressor

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2544926B1 (fr) * 1983-04-20 1986-05-30 Jarret Jacques Anneau magnetique pour generateurs rectilignes a pistons libres
FR2666702B1 (fr) * 1990-09-10 1995-08-25 Shinko Metal Prod Colonne metallique plaquee pour moteur lineaire et procede pour sa fabrication.
US5440600A (en) * 1992-01-10 1995-08-08 General Electric Company Laminated electromagnetic pump stator core
BR0106730A (pt) 2000-02-17 2002-05-14 Lg Eletronics Inc Estrutura para estator de motor com induzido oscilante
DE102012009268A1 (de) * 2012-05-11 2013-11-14 Waltec Maschinen Gmbh Nach dem Longitudinalflussprinzip ausgebildeter Linearmotor

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US662928A (en) * 1900-01-18 1900-12-04 Gen Electric Space-block for armatures.
US3435262A (en) * 1966-06-07 1969-03-25 English Electric Co Ltd Cooling arrangement for stator end plates and eddy current shields of alternating current generators
US3599020A (en) * 1970-02-27 1971-08-10 Ibm Linear actuator with alternating magnetic poles
US3723779A (en) * 1970-06-22 1973-03-27 Information Magnetics Corp Compensated linear motor

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1132643B (de) * 1958-11-07 1962-07-05 Walther Filter Wanderfeldmotor mit hin und her bewegbarem Anker
DE1912251B2 (de) * 1969-03-11 1971-05-06 Elektro linearmotor
DE1940520B2 (de) * 1969-08-08 1970-12-17 Conz Electricitaets Gmbh Elektro-Linearmotor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US662928A (en) * 1900-01-18 1900-12-04 Gen Electric Space-block for armatures.
US3435262A (en) * 1966-06-07 1969-03-25 English Electric Co Ltd Cooling arrangement for stator end plates and eddy current shields of alternating current generators
US3599020A (en) * 1970-02-27 1971-08-10 Ibm Linear actuator with alternating magnetic poles
US3723779A (en) * 1970-06-22 1973-03-27 Information Magnetics Corp Compensated linear motor

Cited By (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4206373A (en) * 1978-02-21 1980-06-03 Exxon Research & Engineering Co. Linear electric motor
US4642493A (en) * 1985-04-25 1987-02-10 Urban Transportation Development Corporation Ltd. Integrally air cooled linear induction motor
US7752736B2 (en) 2000-02-10 2010-07-13 Tritex Corporation Method of magnetizing the shaft of a linear stepper motor
US20010033110A1 (en) * 2000-02-10 2001-10-25 Robert Pulford Linear stepper motor and fixture for the magnetization of the shaft thereof and methods
US20090134720A1 (en) * 2000-02-10 2009-05-28 Pulford Jr Robert Method of magnetizing the shaft of a linear stepper motor
US6756705B2 (en) * 2000-02-10 2004-06-29 Tri-Tech., Inc Linear stepper motor
US20040113509A1 (en) * 2001-05-22 2004-06-17 Lilie Dietmar Erich Bernhard Lamination and lamination arrangement for a linear motor
US6828711B2 (en) 2001-05-22 2004-12-07 Empresa Brasileira De Compressores S.A. -Embraco Lamination and lamination arrangement for a linear motor
WO2002095906A1 (en) * 2001-05-22 2002-11-28 Empresa Brasileira De Compressores S/A.-Embraco Lamination and lamination arrangement for a linear motor
US20050006959A1 (en) * 2003-07-01 2005-01-13 Siemens Aktiengesellschaft Polygonal structure of a linear motor with ring winding
US7271509B2 (en) * 2003-07-01 2007-09-18 Siemens Aktiengesellschaft Polygonal structure of a linear motor with ring winding
US20060218790A1 (en) * 2004-01-23 2006-10-05 The Boeing Company Electromagnet having spacer for facilitating cooling and associated cooling method
US7675395B2 (en) * 2004-01-23 2010-03-09 The Boeing Company Electromagnet having spacer for facilitating cooling and associated cooling method
CN100533930C (zh) * 2004-06-09 2009-08-26 乐金电子(天津)电器有限公司 直线电机定子固定结构
US20070085440A1 (en) * 2004-10-28 2007-04-19 Siemens Aktiengesellschaft Laminations with integrated spacing feature for an electric machine, and method of making a lamination
US7728468B2 (en) * 2004-10-28 2010-06-01 Siemens Aktiengesellschaft Laminations with integrated spacing feature for an electric machine, and method of making a lamination
EP2015430A1 (en) * 2005-01-11 2009-01-14 Trident Energy Limited Improvements to tubular electrical generators
US20080084121A1 (en) * 2005-01-11 2008-04-10 Kelly Hugh-Peter G Tubular Electrical Generators
US7683507B2 (en) 2005-01-11 2010-03-23 Trident Energy Limited Tubular electrical generators
WO2006075147A1 (en) * 2005-01-11 2006-07-20 Trident Energy Limited Improvements to tubular electrical generators
AP2187A (en) * 2005-01-11 2010-12-13 Trident Energy Ltd Improvements to tubular eletrical generators.
AU2006205705B2 (en) * 2005-01-11 2011-03-17 Trident Energy Limited Improvements to tubular electrical generators
CN101107770B (zh) * 2005-01-11 2011-04-06 三叉戟能源有限公司 改进的管状发电机
NO337314B1 (no) * 2005-01-11 2016-03-07 Trident Eneergy Ltd Forbedringer til rørformede elektriske generatorer
US20070249127A1 (en) * 2006-04-24 2007-10-25 Freescale Semiconductor, Inc. Electronic device including a semiconductor layer and a sidewall spacer and a process of forming the same
US20100225179A1 (en) * 2006-12-20 2010-09-09 Kulicke And Soffa Industries, Inc. Linear motor with reduced cogging
US7825549B2 (en) * 2006-12-20 2010-11-02 Kulicke And Soffa Industries, Inc. Linear motor with reduced cogging
US20150132161A1 (en) * 2012-11-07 2015-05-14 Haier Group Corporation Stator of linear compressor and fixing method thereof, linear motor, and linear compressor
US9923441B2 (en) * 2012-11-07 2018-03-20 Haier Group Corporation Stator of linear compressor and fixing method thereof, linear motor, and linear compressor

Also Published As

Publication number Publication date
GB1427083A (en) 1976-03-03
BR7305695D0 (pt) 1974-08-22
FR2202394B1 (it) 1975-03-07
JPS4985510A (it) 1974-08-16
FR2202394A1 (it) 1974-05-03
CH554102A (de) 1974-09-13
IT992705B (it) 1975-09-30
DE2334178A1 (de) 1974-02-07

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