EP0441830A1 - Electroaimant - Google Patents

Electroaimant

Info

Publication number
EP0441830A1
EP0441830A1 EP19890912154 EP89912154A EP0441830A1 EP 0441830 A1 EP0441830 A1 EP 0441830A1 EP 19890912154 EP19890912154 EP 19890912154 EP 89912154 A EP89912154 A EP 89912154A EP 0441830 A1 EP0441830 A1 EP 0441830A1
Authority
EP
European Patent Office
Prior art keywords
coil
armature
magnet
electromagnet according
electromagnet
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Withdrawn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
EP19890912154
Other languages
German (de)
English (en)
Inventor
Assadollah Abri
Robert Nordgren
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.)
ABB AB
Original Assignee
Asea Brown Boveri AB
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 Asea Brown Boveri AB filed Critical Asea Brown Boveri AB
Publication of EP0441830A1 publication Critical patent/EP0441830A1/fr
Withdrawn legal-status Critical Current

Links

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
    • H01F7/14—Pivoting armatures

Definitions

  • the present invention relates to an electromagnet of the kind described in the preamble to claim 1.
  • the magnet which is designed with a rotating armature, is primarily intended to be used for operation of current-limiting switching devices for rated operating voltages of up to about 1000 V. However, it may be used with advantage in other applications as well, in which a rapid operation is required.
  • Electromagnets with rotating armature are previously known.
  • the air gap of the electromagnet (the pole surface of the armature) lies out ⁇ side of the magnet coil. This causes a considerable part of the magnetic flux to be closed through the air outside the core, which results in considerable magnetic losses and reduces the attractive force of the electromagnet, especi ⁇ ally in the case of saturation.
  • the design is not suitable to use in current-limiting three-phase circuit.breakers, in which one operating magnet in each phase is-required and in which the distance between the phases is limited.
  • a relatively large cross section of the magne ⁇ tic circuit is desired in order to achieve high flux values and, hence, great operating force and operating speed.
  • the armature it is then advantageous for the armature to be as wide as possible. Increasing the thickness of the armature is no good solution, since this reduces the length of stroke of the magnet.
  • the primary object of the present invention is to provide an ultrarapid striking pin, a so-called kicker, for direct- ly actuating the contact system of a switching device to achieve a rapid breaking and limitation of the current in case of a short circuit.
  • This is achieved with an electro ⁇ magnet-provided with a rotating armature, the magnetic cir ⁇ cuit of the electromagnet having two series-connected air gaps, like the described prior art design, which are both enclosed in the magnet coil.
  • the magnetic core consists of a substantially rectangular frame or U-shaped yoke, which surrounds the coil in such a way that two opposite sides of the envelope surface of the coil are free.
  • the magnetic force can be transmitted from the armature to the contact carrier of the switching device with the aid of an operating arm fixed to the armature. Because of the rotating movement of the armature, a relativley large length of stroke with a relatively small air gap can be obtained with such a design. Otherwise, the design pro ⁇ vides great possibilities, among other things by changing the length of the operating arm, of trimming the tripping force, the contact speed and the contact distance. To avoid that the operating arm influences the magnetic flux in the magnet, the operating arm can be made of non-magne ⁇ tic material.
  • the bearing arrangement of the rotating magnet armature is accomplished according to the invention with the aid of guiding surfaces on the inside of the coil bobbin. Since the armature is loosely located in the coil bobbin and is guided up by guiding surfaces thereon, the manufacture and the mounting will be simpler and less expensive than in the prior art designs using fixed bearing points. In addi ⁇ tion the armature can be made solid without holes for bear ⁇ ings, which makes possible a greater magnetic flux in the armature.
  • Figures 1 and 2 show a first embodiment of an electromagnet according to the invention, Figure 1 being a section along the line I-I in Figure 2, and Figure 2 a section along the line II-II in Figure 1,
  • Figure 3 shows separately the different parts inclu ⁇ ded in the magnet according to Figures 1 and 2, the arrows showing how the parts are assembled together,
  • Figures 4 and 5 show, in the same way as in Figure 1, a second and third embodiment, respectively, of an electromagnet according to the inven ⁇ tion,
  • Figures 6, 7, 8 and 9 show a fourth embodiment of an elec ⁇ tromagnet designed according to the inven ⁇ tion, Figure 6 being a view from the side, Figure 7 a view from above, Figure 8 a sec ⁇ tion along the line VIII-VIII in Figure 7, and Figure 9 a section along the line IX-IX in Figure 6, and
  • Figures 10, 11 and 12 show a fifth embodiment of an elec ⁇ tromagnet according to the invention, Figure 10 being a view from the side, Figure 11 a view from above, and Figure 12 a section along the line XII-XII in Figure 11.
  • the electromagnet shown in Figures 1 and 2 is built up of the parts shown in Figure 3.
  • the magnet comprises a winding 10 of insulated copper wire arranged around a coil tube 11 of plastic.
  • the coil consisting of parts 10 and 11 is surrounded by a frame-shaped iron core, which consists of two identical, substantially L-shaped parts 12, 13 made of iron plate by punching and bending.
  • One leg of the core parts 12, 13 exhibits an inwardly-bent tongue 14 and 15, respectively.
  • the magnet has an armature 16 enclosed in the magnet coil, the armature being rotatable about an axis of rota ⁇ tion oriented perpendicular to the longitudinal axis of the winding 10.
  • the axis of rotation passes through the central portion of the armature, the central portion being journalled, via an operating arm which will be described below, between two ridge-formed wall portions 17, 18, directed against each other, in the coil tube 11.
  • the co.il tube is formed with diametrically located cylindrical guiding surfaces 19 » 20.
  • the armature 16 is rotatable between a rest position in which the magnetic circuit exhibits two series-connected air gaps 21, 22, and an activated position in which the armature makes contact with the pole ends 14, 15 of the magnetic core.
  • the movement of the armature is brought out from the magnet with the aid of an operating arm fixed to the armature.
  • the operating arm consists of two arm parts 23, 24 of non-magnetic material, for example brass, stainless steel, plastic, etc., which are each arranged on a respective side of the armature.
  • the mid-portions of the arm parts are provided with square holes 25 fitting square shaft pins 26 on the armature.
  • the arm parts are formed with circular mid-portions which together with shoulder surfaces on the wall portions 17, 18 of the coil tube form a bearing for the operating arm and the armature.
  • the arm parts are joined together with the aid of two pins 27, 28 at the ends of the arm parts.
  • the arma- ture In the case of a currentless magnetic winding, the arma- ture is kept in its rest position with the aid of a tension spring 30, one end of which is attached to the pin 27 and the other end of which is attached to a fixing projection 31 stamped on the magnetic core. --.
  • the iron core 12, 13 consists of two identical halves composed of ferromag ⁇ netic plates. Otherwise, this embodiment does not differ, in principle, from the design shown in Figures 1-3.
  • a laminated iron core according to Figure 4 better 10 magnetic properties and a greater attractive force are achieved in the magnet.
  • the operating arm 23 is an extension of the armature 16, the armature move ⁇ ment thus being made available without any extra parts.
  • the magnetic core 12 is made in one single sheet metal part, which has been com ⁇ pletely bent after the mounting of the armature.
  • the shape of the core before the bending is completed is shown in dashed lines.
  • the bearing of the armature is integra- 0 ted with the coil tube, which for this purpose is formed with two laterally displaced support walls 32, 33.
  • the armature is formed with two oppositely directed projec ⁇ tions 34, 35 cooperating with the support walls 32, 33 for fixing the armature in the axial direction.
  • a com- 5 pression spring 36 maintains the armature in its rest position when the magnet coil is currentless or is tra ⁇ versed by current below a certain level.
  • the magnetic core consists of a substantially rectangular frame consisting of
  • the embodiment shown in Figures 10-12 differs from that described with reference to Figures 6-9 in that the magne ⁇ tic core consists of a substantially U-formed yoke, the base portion 12 of which extends diagonally between the ends of the magnet coil and the legs 14, 15 of which form the pole ends of the magnetic core. Since this embo ⁇ diment consists of only a few parts, it will be relatively inexpensive to manufacture.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
  • Relay Circuits (AREA)

Abstract

La présente invention se rapporte à un électroaimant comportant une bobine d'aimant (10, 11) et un circuit magnétique composé d'un noyau fixe (12, 13) et d'une armature rotative (16). Dans la position de repos de l'armature, le circuit magnétique présente deux entrefers connectés en série (21, 22), disposés à l'intérieur de la bobine d'aimant. L'aimant est essentiellement conçu pour être utilisé comme aimant de déflexion rapide pour l'actionnement direct du système de contact d'un commutateur électrique, afin de permettre une interruption rapide et une limitation du courant en cas de court-circuit.
EP19890912154 1988-11-02 1989-11-02 Electroaimant Withdrawn EP0441830A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE8803975A SE8803975L (sv) 1988-11-02 1988-11-02 Elektromagnet
SE8803975 1988-11-02

Publications (1)

Publication Number Publication Date
EP0441830A1 true EP0441830A1 (fr) 1991-08-21

Family

ID=20373840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19890912154 Withdrawn EP0441830A1 (fr) 1988-11-02 1989-11-02 Electroaimant

Country Status (3)

Country Link
EP (1) EP0441830A1 (fr)
SE (1) SE8803975L (fr)
WO (1) WO1990005368A1 (fr)

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT261040B (de) * 1963-04-11 1968-04-10 Siemens Ag Ungepoltes Elektromagnetsystem in Kleinstbauweise, insbesondere für Relais

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9005368A1 *

Also Published As

Publication number Publication date
SE8803975L (sv) 1989-10-06
SE8803975D0 (sv) 1988-11-02
WO1990005368A1 (fr) 1990-05-17

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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17P Request for examination filed

Effective date: 19910426

AK Designated contracting states

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18W Application withdrawn

Withdrawal date: 19930918