EP2657173B1 - Electromagnetic brake device for elevator - Google Patents

Electromagnetic brake device for elevator Download PDF

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Publication number
EP2657173B1
EP2657173B1 EP10861051.0A EP10861051A EP2657173B1 EP 2657173 B1 EP2657173 B1 EP 2657173B1 EP 10861051 A EP10861051 A EP 10861051A EP 2657173 B1 EP2657173 B1 EP 2657173B1
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EP
European Patent Office
Prior art keywords
piece
movable iron
iron piece
brake device
elastic body
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.)
Active
Application number
EP10861051.0A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2657173A4 (en
EP2657173A1 (en
Inventor
Daisuke Okada
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
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Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2657173A1 publication Critical patent/EP2657173A1/en
Publication of EP2657173A4 publication Critical patent/EP2657173A4/en
Application granted granted Critical
Publication of EP2657173B1 publication Critical patent/EP2657173B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66B—ELEVATORS; ESCALATORS OR MOVING WALKWAYS
    • B66B11/00—Main component parts of lifts in, or associated with, buildings or other structures
    • B66B11/04—Driving gear ; Details thereof, e.g. seals
    • B66B11/08—Driving gear ; Details thereof, e.g. seals with hoisting rope or cable operated by frictional engagement with a winding drum or sheave
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/24—Operating devices
    • B66D5/30—Operating devices electrical
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/12—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect
    • B66D5/14—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes with axial effect embodying discs

Definitions

  • the present invention relates to an electromagnetic brake device provided in a traction machine of an elevator.
  • Patent Literature 1 described below discloses an electromagnetic brake device provided in a traction machine of an elevator.
  • a rotary body which rotates in response to the rotation of a driving sheave is provided in the traction machine.
  • the electromagnetic brake device pushes a braking piece against the rotary body with the force of a spring, generating a force for holding a car at a standstill (hereinafter also referred to simply as "a standstill retentive force").
  • a standstill retentive force On the other hand, during the ascent and descent of a car, in the electromagnetic brake device, attraction which resists the force of the spring is caused to be generated from an electromagnet, isolating the braking piece from the rotary body.
  • Patent Literature 1 In an elevator, a great force is necessary for holding a car at a standstill. For this reason, the electromagnetic brake device described in Patent Literature 1 has the problem that, when the braking piece collides with the rotary body, that is, each time the car stops, a large noise is generated.
  • Patent Literature 2 described below discloses a technique for reducing the collision noise generated when the electromagnetic brake device operates.
  • the electromagnetic brake device described in Patent Literature 1 has the problem that because the spring of a larger pushing force is operated first in holding the car at a standstill, it is impossible to sufficiently reduce the above-described collision noise.
  • the present invention was made to solve the problem described above and an object of the invention is to provide an electromagnetic brake device for an elevator which can substantially reduce the noise generated when a braking piece collides with a rotary body.
  • the invention is defined by claim 1.
  • An electromagnetic brake device for an elevator of the present invention is a device which holds a car of an elevator at a standstill by pushing a braking piece against a rotary body rotating in response to the rotation of a driving sheave of an elevator traction machine.
  • the electromagnetic brake device comprises a first movable iron piece which is provided with the braking piece, the braking piece being disposed in such a manner as to be opposed to the rotary body, a second movable iron piece which is disposed on the side opposite to the braking piece with respect to the first movable iron piece, a first elastic body having a prescribed pushing force, which is provided between the first movable iron piece and the second movable iron piece, a second elastic body which pushes the second movable iron piece against the first movable iron piece side with a prescribed pushing force stronger than the pushing force of the first elastic body, and an electromagnet which attracts the second movable iron piece against the pushing force of the second elastic body and causes the second movable iron piece to attract the first movable iron
  • Figure 1 is a diagram showing the general configuration of an elevator.
  • reference numeral 1 denotes a shaft of an elevator
  • reference numeral 2 denotes a car of the elevator
  • reference numeral 3 denotes a counterweight.
  • the car 2 and the counterweight 3 are suspended by a main rope 4 in a well bucket manner in the shaft 1.
  • Reference numeral 5 denotes a thin-type traction machine provided in the upper space in the shaft 1.
  • the traction machine 5 constitutes a driving device which drives the car 2.
  • a driving sheave 6 is provided on the traction machine 5 in such a manner as to be rotatable in both directions. Part of the main rope 4 is wound on the driving sheave 6. Because the main rope 4 moves longitudinally in response to the rotation of the driving sheave 6, the car 2 ascends and descends in the shaft 1 according to the moving direction of the main rope 4.
  • reference numeral 7 denotes a guide rail for guiding the ascent and descent of the car 2
  • reference numeral 8 denotes a governor for detecting a prescribed overspeed condition.
  • Figure 2 is a rear view showing the traction machine provided with the electromagnetic brake device for an elevator in a first embodiment according to the present invention
  • Figure 3 is a view taken along the A-A line of Figure 2
  • Figure 4 is an enlarged view of the part C of Figure 1
  • Figure 2 shows a view taken along the B-B line of Figure 3 .
  • Reference numeral 11 denotes a frame which constitutes the framework of the traction machine 5.
  • the driving sheave 6 is rotatably provided in the frame 11 via a bearing.
  • Reference numeral 12 denotes a rotary body provided integrally with the driving sheave 6. The rotary body 12 rotates in response to the rotation of the driving sheave 6.
  • a cylindrical part 13 in the shape of a short (a short width) cylinder is formed in part of the rotary body 12.
  • the cylindrical part 13 has the same axis of rotation as the driving sheave 6, and is disposed in the interior of the frame 11.
  • the cylindrical part 13 is supported by the frame 11 via other portions of the rotary body 12.
  • a rotor iron core 14 is provided on an outer circumferential surface 13a of the cylindrical part 13.
  • Reference numeral 15 denotes a stator which constitutes the main part of the electric motor.
  • the stator 15 is provided on an inner circumferential surface of the frame 11 in such a manner as to be opposed to the rotor iron core 14.
  • the electromagnetic brake device 10 generates the force for holding the car 2 at a standstill by pushing a braking piece 16 against the rotary body 12. During the ascent and descent of the car 2, the electromagnetic brake device 10 separates the braking piece 16 from the rotary body 12 and releases the standstill retentive force.
  • the electromagnetic brake device 10 is provided on both sides of the rotary body 12. In this case, the electromagnetic brake device 10 prevents the rotation of the rotary body 12 by pushing the braking piece 16 against the outer circumferential surface 13a of the cylindrical part 13 from the sides.
  • the outer circumferential surface 13a of the cylindrical part 13 functions as a braking surface for generating the standstill retentive force.
  • the operating direction of the electromagnetic brake device 10, Le the direction in which the braking piece 16 operates when the braking piece 16 comes into contact with the rotary body 12 ⁇ the braking surface) and moves away from the rotary body 12 (the braking surface), is a horizontal direction.
  • a field 17, a coil 18, a movable piece (an iron piece) 19, a spring (an elastic body) 20, a movable piece (an iron piece) 21, and an elastic body 22 constitute the main part of the electromagnetic brake device 10.
  • the field 17 and the coil 18 constitute an electromagnet. That is, an electromagnetic force is generated in the field 17 by applying a voltage to the coil 18.
  • An opening 11a is formed on both side portions of the frame 11.
  • the field 17 is placed onto the frame 11 in such a manner as to cover the opening 11a from outside and is attached to the frame 11 by bolts 23.
  • the coil 18 is provided in the field 17 in such a manner that the axis thereof faces the above-described operating direction.
  • the movable piece 19 is supported by the field 17 in such a manner as to be able to move in the operating direction in a prescribed range.
  • the movable piece 19 is disposed on the rotary body 12 side of the field 17 so that one side surface thereof is opposed to the field 17. That is, the movable piece 19 is attached to the field 17 in such a manner as to approach the rotary body 12 and move away from the rotary body 12.
  • the spring 20 is intended for use in pushing the movable piece 19 with a prescribed pushing force in the direction in which the movable piece 19 moves away from the field 17 in the operating direction. That is, the movable piece 19 is constantly pushed by the spring 20 to the rotary body 12 side.
  • the spring 20 is provided in the field 17 and the tip portion thereof is connected to the one side surface of the movable piece 19.
  • the movable piece 21 is supported by the movable piece 19 in such a manner as to be able to move in the operating direction in a prescribed range.
  • the movable piece 21 is disposed on the rotary body 12 side of the movable piece 19 so that one side surface thereof is opposed to the other side surface of the movable piece 19.
  • the braking piece 16 is provided on the other side surface of the movable piece 21 (the surface facing the side opposite to the one side surface) and is disposed so as to be opposed to the outer circumferential surface 13a of the cylindrical part 13.
  • the movable piece 19 is disposed on the side opposite to the braking piece 16 with respect to the movable piece 21, and the braking piece 16, the movable piece 21, the movable piece 19, and the electromagnet (the field 17) are disposed in series outside the rotary body 12 and in the operating direction.
  • the elastic body 22 is provided between the other side surface of the movable piece 19 and the one side surface of the movable piece 21.
  • the elastic body 22 is a member formed from rubber, spring and the like, and is provided so as to expand and contract in the above-described operating direction in the same manner as the spring 20.
  • the elastic body 22 has a prescribed pushing force weaker than the pushing force of the spring 20.
  • the elastic body 22 causes a force to apply in the operating direction so that the movable piece 19 and the movable piece 21 move away from each other with the pushing force thereof.
  • the spring 20 pushes the movable piece 19 to the movable piece 21 side with a prescribed pushing force stronger than the pushing force of the elastic body 22.
  • the movable piece 19 is a member, for example, having a section in the shape of the letter C, which is open on the rotary body 12 side. That is, in the movable piece 19, a concavity is formed on the other side surface opposed to the movable piece 21.
  • the movable piece 21 is configured in such a manner that when the elastic body 22 contracts, the whole is disposed in the concavity of the movable piece 19.
  • FIGS 5 to 7 are diagrams to explain the operation of the electromagnetic brake device for an elevator in the first embodiment according to the present invention.
  • Figure 5 shows the condition of the electromagnetic brake device 10 acting when the car 2 is running in the shaft 1.
  • a prescribed voltage is applied to the coil 18.
  • electromagnetic attraction Phil is generated between the field 17 and the movable piece 19, and the field 17 attracts the movable piece 19 against the pushing force Fkl of the spring 20. That is, the electromagnetic attraction lis set at a prescribed magnitude capable of overcoming the pushing force Fk1 of the spring 20.
  • electromagnetic attraction Fm2 is generated also between the movable piece 19 and the movable piece 21.
  • the electromagnetic attraction Fm2 is weaker than the electromagnetic attraction Fm1, the electromagnetic attraction Fm2 is set at a prescribed magnitude capable of overcoming the pushing force Fk2 ( ⁇ Fk1) of the elastic body 22. For this reason, the movable piece 19 attracts the movable piece 21 against the pushing force Fk2 of the elastic body 22.
  • the movable piece 19 is attracted to the field 17 side, for example, until the one side surface thereof comes into contact with the field 17.
  • This configuration can be realized, for example, by fitting the spring 20 in such a manner that the spring 20 can be disposed in the interior of the field 17.
  • the movable piece 21 approaches the movable piece 19 and is disposed in the concavity of the movable piece 19.
  • a braking instruction is outputted from a prescribed control apparatus (not shown in Figures).
  • the electromagnetic brake device II performs prescribed processing for reducing the voltage of the coil 18 by demagnetizing. As a result of this, the current flowing through the coil 18 decreases gradually, and the electromagnetic attractions Fm1 and Fm2 become small gradually.
  • the electromagnetic attraction Fm2 becomes smaller than the pushing force Fk2 of the elastic body 22. Then, the movable piece 21 is moved by the pushing force Fk2 of the elastic body 22 to the rotary body 12 side, and the braking piece 16 collides with the outer circumferential surface 13a of the cylindrical part 13. Because the movable piece 19 is disposed in a position close to the field 17, the electromagnetic attraction Fm1 lis larger than the electromagnetic attraction Fm2. For this reason, even when the current value of the coil 18 has decreased to I1, the electromagnetic attraction Fm1 is larger than the pushing force Fk1 of the spring 20, and the movable piece 19 remains in tight contact with the field 17.
  • Figure 6 shows the condition in which the current value of the coil 18 has decreased to I1.
  • the elastic body 22 has a prescribed amount of elongation capable of bringing the braking piece 16 into contact with the rotary body 12, with the movable piece 19 kept in tight contact with the field 17.
  • Figure 7 shows the condition in which the current value of the coil 18 has decreased to I2.
  • the electromagnetic brake device 10 when a braking instruction is outputted from the control apparatus, first, the movable piece 21 moves to the rotary body 12 side and the braking piece 16 collides with the cylindrical part 13. At this time, because the spring 20 of a large pushing force remains compressed, only the small pushing force of the elastic body 22 acts on the braking piece 16. That is, it is possible to control the energy during the collision of the braking piece 16 with the rotary body 12 to restrict to small values and the noise generated at this time can be substantially reduced.
  • the braking piece 16 is brought into contact with the outer circumferential surface 13a of the cylindrical part 13, the braking piece 16 is pushed against the rotary body 12 with a large pushing force of the spring 20. For this reason, it is possible to generate a stable standstill retentive force after the above-described noise is prevented.
  • the configuration and disposition of the traction machine 5 are not limited to this.
  • the disposition and operating direction of the electromagnetic brake device 10 are not limited to the above description, either.
  • the electromagnetic brake device 10 may be disposed on the inner side of the rotary body 12 and the operating direction of the electromagnetic brake device 10 may be set in the axial direction of the rotary body 12. Even in the case of such configurations, it is possible to produce the same effect as described above.
  • the electromagnetic brake device according to the present invention can be applied to an electromagnetic brake device installed in a traction machine of an elevator.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Braking Arrangements (AREA)
  • Cage And Drive Apparatuses For Elevators (AREA)
EP10861051.0A 2010-12-24 2010-12-24 Electromagnetic brake device for elevator Active EP2657173B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2010/073353 WO2012086060A1 (ja) 2010-12-24 2010-12-24 エレベーター用電磁ブレーキ装置

Publications (3)

Publication Number Publication Date
EP2657173A1 EP2657173A1 (en) 2013-10-30
EP2657173A4 EP2657173A4 (en) 2017-08-16
EP2657173B1 true EP2657173B1 (en) 2020-03-25

Family

ID=46313359

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10861051.0A Active EP2657173B1 (en) 2010-12-24 2010-12-24 Electromagnetic brake device for elevator

Country Status (5)

Country Link
EP (1) EP2657173B1 (ja)
JP (1) JP5494826B2 (ja)
KR (1) KR101482480B1 (ja)
CN (1) CN103261079B (ja)
WO (1) WO2012086060A1 (ja)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103489714B (zh) * 2013-09-25 2015-12-09 中国科学院深圳先进技术研究院 一种锁紧装置
JP6067177B2 (ja) * 2014-03-13 2017-01-25 三菱電機株式会社 エレベータおよびエレベータ用巻上機ブレーキ
DE102014215911A1 (de) * 2014-08-12 2016-02-18 Zf Friedrichshafen Ag Scheibenbremsanordnung
DE102015213740A1 (de) * 2015-07-21 2017-02-09 Zf Friedrichshafen Ag Elektromagnetische Konusbremse und Personenbeförderungsmittelantrieb
CN105984790B (zh) * 2016-07-19 2018-07-17 苏州福特美福电梯有限公司 一种自减速型电磁安全轿厢
CN107934713A (zh) * 2017-12-15 2018-04-20 江苏立达电梯有限公司 电梯限速器、电梯限速器控制装置及电梯限速控制方法
WO2020183643A1 (ja) * 2019-03-13 2020-09-17 三菱電機株式会社 エレベータの巻上機ブレーキ及び巻上機
EP3712025B1 (en) * 2019-03-22 2022-11-09 KONE Corporation Silent electromagnetic brake

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3787862B2 (ja) * 1995-10-03 2006-06-21 三菱電機株式会社 エレベータのブレーキ装置及びエレベータ装置
JP3537348B2 (ja) 1999-04-05 2004-06-14 三菱電機株式会社 トラクション式エレベーター用巻上機
JP4878089B2 (ja) 2001-06-15 2012-02-15 三菱電機株式会社 エレベータ用巻上機のブレーキ
JP2004076899A (ja) 2002-08-21 2004-03-11 Mitsubishi Electric Corp エレベータ巻上機のブレーキ装置
JP2005172021A (ja) * 2003-12-08 2005-06-30 Mitsubishi Electric Corp 電磁制動装置
JP4455042B2 (ja) * 2003-12-18 2010-04-21 三菱電機株式会社 エレベーター用巻上機
KR200424453Y1 (ko) 2006-06-07 2006-08-22 현대엘리베이터주식회사 드럼방식의 직접형 전자 브레이크를 구비한 권양기
IL186678A0 (en) * 2006-11-16 2008-02-09 Inventio Ag Brake equipment, lift installation, a method for detecting a function of the brake equipment, and a modernisation set

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
CN103261079B (zh) 2015-01-28
EP2657173A4 (en) 2017-08-16
WO2012086060A1 (ja) 2012-06-28
EP2657173A1 (en) 2013-10-30
JPWO2012086060A1 (ja) 2014-05-22
KR101482480B1 (ko) 2015-01-13
CN103261079A (zh) 2013-08-21
JP5494826B2 (ja) 2014-05-21
KR20130115324A (ko) 2013-10-21

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