EP1253226A1 - Linearmotor, insbesondere für elektromechanische Stellglieder in Webmaschinen - Google Patents

Linearmotor, insbesondere für elektromechanische Stellglieder in Webmaschinen Download PDF

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Publication number
EP1253226A1
EP1253226A1 EP02008352A EP02008352A EP1253226A1 EP 1253226 A1 EP1253226 A1 EP 1253226A1 EP 02008352 A EP02008352 A EP 02008352A EP 02008352 A EP02008352 A EP 02008352A EP 1253226 A1 EP1253226 A1 EP 1253226A1
Authority
EP
European Patent Office
Prior art keywords
driving shaft
core portions
electric motor
core
linear electric
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.)
Granted
Application number
EP02008352A
Other languages
English (en)
French (fr)
Other versions
EP1253226B1 (de
Inventor
Rosario Castelli
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.)
LGL Electronics SpA
Original Assignee
LGL Electronics SpA
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 LGL Electronics SpA filed Critical LGL Electronics SpA
Publication of EP1253226A1 publication Critical patent/EP1253226A1/de
Application granted granted Critical
Publication of EP1253226B1 publication Critical patent/EP1253226B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/16—Rectilinearly-movable armatures
    • H01F7/1607—Armatures entering the winding
    • H01F7/1615—Armatures or stationary parts of magnetic circuit having permanent magnet
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D47/00—Looms in which bulk supply of weft does not pass through shed, e.g. shuttleless looms, gripper shuttle looms, dummy shuttle looms
    • D03D47/34—Handling the weft between bulk storage and weft-inserting means
    • D03D47/36—Measuring and cutting the weft
    • D03D47/361—Drum-type weft feeding devices
    • D03D47/362—Drum-type weft feeding devices with yarn retaining devices, e.g. stopping pins
    • D03D47/363—Construction or control of the yarn retaining devices
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F7/00—Magnets
    • H01F7/06—Electromagnets; Actuators including electromagnets
    • H01F7/08—Electromagnets; Actuators including electromagnets with armatures
    • H01F7/121—Guiding or setting position of armatures, e.g. retaining armatures in their end position
    • H01F7/122—Guiding or setting position of armatures, e.g. retaining armatures in their end position by permanent magnets

Definitions

  • the present invention is concerned with an improved structure of a linear electric motor for electromechanical actuators of weaving machines, and more particularly of metering weft-suppliers for fluid jet looms.
  • the invention relates to linear electric motors comprising a driving shaft, usually made of a ceramic material, to which are coupled cylindrical, radial-polarity permanent magnets which form a movable core for the motor.
  • the core linearly slides within a cavity of a stator housing bearing excitation coils and guide/supporting bushes for said driving shaft.
  • the movable core in a linear motor of the above-specified kind moves at a high speed. Due to this circumstance, on the one hand, such motors are particularly suitable to operate as electromechanical actuators because of their quick action, but, on the other hand, because of the high accelerations and decelerations to which the core is subjected, the core suffers to high mechanical stresses, and the parts of the motor must therefore be oversized, with unfavorable dynamical and economical consequences, including a limitation of the life of the motor.
  • the invention is based on the innovative concept of providing the driving shaft with a central salient collar integral with the shaft and onto which the entire movable core of the motor is firmly crimped.
  • the movable core consists of two substantially cylindrical, identical core portions made of a non-magnetic material, provided with respective terminal flanges and mounted on the driving shaft on opposite sides of said collar, from which they are separated by means of at least one elastomeric ring. Said core portions have respective threaded areas which are screwed into corresponding threaded areas of a cylindrical central case.
  • the threaded engagement by deforming said elastomeric ring, pushes the terminal flanges of said core portions axially into abutment with corresponding, radial-polarity, magnetic rings, thereby locking said magnetic rings onto said driving shaft.
  • Fig. 1 shows a known linear motor 1 of a known kind, comprising a hollow stator 2 having at least two pole pieces 3, 4 and preferably a third pole piece 5 (intended to considerably improve the performance of the motor) and two excitation coils 6, 7.
  • a movable core of the motor, referenced generally as 8, is slidable with rectilinear motion within the stator cavity and is firmly crimped onto a driving shaft 9, typically of a ceramic material, and which is also slidable, being supported and guided by bushes 10 carried by stator 2.
  • driving shaft 9 is provided with a projecting central collar 9a integral with the shaft, onto which movable core 8 is firmly crimped.
  • core 8 consists of two identical, substantially cylindrical core portions 11a, 11b, made of a non-magnetic material such as aluminum, and provided with respective terminal flanges 110a, 110b. Said portions are mounted on driving shaft 9 on opposite sides of collar 9a, and they are separated from the collar by at least one elastomeric O-ring 12.
  • Core portions 11a, 11b have respective threaded areas 13-14 that are screwed into a correspondingly threaded cylindrical central case 15.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Textile Engineering (AREA)
  • Power Engineering (AREA)
  • Linear Motors (AREA)
  • Looms (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP20020008352 2001-04-27 2002-04-12 Linearmotor, insbesondere für elektromechanische Stellglieder in Webmaschinen Expired - Lifetime EP1253226B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO20010061 2001-04-27
ITTO20010061 ITTO20010061U1 (it) 2001-04-27 2001-04-27 Struttura perfezionata di motore elettrico lineare particolarmente per attuatori elettromeccanici di macchine tessili.

Publications (2)

Publication Number Publication Date
EP1253226A1 true EP1253226A1 (de) 2002-10-30
EP1253226B1 EP1253226B1 (de) 2005-06-15

Family

ID=11458440

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020008352 Expired - Lifetime EP1253226B1 (de) 2001-04-27 2002-04-12 Linearmotor, insbesondere für elektromechanische Stellglieder in Webmaschinen

Country Status (3)

Country Link
EP (1) EP1253226B1 (de)
DE (1) DE60204625T2 (de)
IT (1) ITTO20010061U1 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1328431C (zh) * 2002-02-15 2007-07-25 株式会社丰田自动织机 用于控制织机中引纬的电磁驱动装置
CN108866768A (zh) * 2017-05-12 2018-11-23 罗伊有限公司 用于停止织机的纬纱进给器中的纬纱的电磁装置以及用于这种装置的滑动器

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3870931A (en) * 1974-02-04 1975-03-11 Sun Chemical Corp Solenoid servomechanism
EP0363938A1 (de) * 1988-10-14 1990-04-18 ROJ ELECTROTEX S.p.A. Elektromagnetische Einheit zum Blockieren des Schussfadens in einer Schussfadenmess- und liefervorrichtung für Düsenwebmaschinen

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3870931A (en) * 1974-02-04 1975-03-11 Sun Chemical Corp Solenoid servomechanism
EP0363938A1 (de) * 1988-10-14 1990-04-18 ROJ ELECTROTEX S.p.A. Elektromagnetische Einheit zum Blockieren des Schussfadens in einer Schussfadenmess- und liefervorrichtung für Düsenwebmaschinen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1328431C (zh) * 2002-02-15 2007-07-25 株式会社丰田自动织机 用于控制织机中引纬的电磁驱动装置
CN108866768A (zh) * 2017-05-12 2018-11-23 罗伊有限公司 用于停止织机的纬纱进给器中的纬纱的电磁装置以及用于这种装置的滑动器
CN108866768B (zh) * 2017-05-12 2021-01-05 罗伊有限公司 用于停止织机的纬纱进给器中的纬纱的电磁装置以及用于这种装置的滑动器

Also Published As

Publication number Publication date
DE60204625D1 (de) 2005-07-21
DE60204625T2 (de) 2006-05-11
EP1253226B1 (de) 2005-06-15
ITTO20010061V0 (it) 2001-04-27
ITTO20010061U1 (it) 2002-10-28

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