EP0157029A1 - Entraînement électromagnétique et relais polarisé - Google Patents

Entraînement électromagnétique et relais polarisé Download PDF

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Publication number
EP0157029A1
EP0157029A1 EP84302339A EP84302339A EP0157029A1 EP 0157029 A1 EP0157029 A1 EP 0157029A1 EP 84302339 A EP84302339 A EP 84302339A EP 84302339 A EP84302339 A EP 84302339A EP 0157029 A1 EP0157029 A1 EP 0157029A1
Authority
EP
European Patent Office
Prior art keywords
movable block
yoke
core
electromagnetic drive
coil
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Withdrawn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
EP84302339A
Other languages
German (de)
English (en)
Inventor
Hirofumi Koga
Kozo Maenishi
Shuichi 172 Kageyukoji-Cho Kishimoto
Sueaki Honda
Kenichi Tsuruyoshi
Takezo Sano
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.)
Omron Corp
Original Assignee
Omron Tateisi Electronics Co
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to EP84302339A priority Critical patent/EP0157029A1/fr
Priority to EP88110935A priority patent/EP0303054B1/fr
Priority to US06/762,860 priority patent/US4626813A/en
Priority claimed from US06/762,860 external-priority patent/US4626813A/en
Publication of EP0157029A1 publication Critical patent/EP0157029A1/fr
Priority to US06/914,521 priority patent/US4727344A/en
Priority to AT88110935T priority patent/ATE90474T1/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/22—Polarised relays
    • H01H51/2209—Polarised relays with rectilinearly movable armature
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/44—Magnetic coils or windings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/02—Bases; Casings; Covers
    • H01H50/04—Mounting complete relay or separate parts of relay on a base or inside a case
    • H01H50/041—Details concerning assembly of relays
    • H01H2050/046—Assembling parts of a relay by using snap mounting techniques
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/22—Polarised relays
    • H01H51/2209—Polarised relays with rectilinearly movable armature
    • H01H2051/2218—Polarised relays with rectilinearly movable armature having at least one movable permanent magnet
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/163—Details concerning air-gaps, e.g. anti-remanence, damping, anti-corrosion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/22—Polarised relays
    • H01H51/2227—Polarised relays in which the movable part comprises at least one permanent magnet, sandwiched between pole-plates, each forming an active air-gap with parts of the stationary magnetic circuit

Definitions

  • the present invention relates to an electromagnetic drive unit destined to be used in a relay apparatus and a polarized relay of the type in which relay contacts are driven by a movable member or block adapted to be operated through energization of the electromagnetic drive unit.
  • the contacts are operated by means of a drive mechanism which comprises such an electromagnetic drive unit or assembly as shown in Figure 1 of the accompanying drawings.
  • the electromagnetic drive assembly is composed of a permanent magnet 1 and a pair of inverted C-like armature plates 2 and 3 between which the permanent magnet 1 is sandwiched in such orientation in which the axis of magnetization of the permanent magnet 1 extends perpendicularly to the armature plates 2 and 3.
  • a bar-like iron core 5 wound with the coil 4 is disposed between the armature plates 2 and 3 with both ends of the core 5 being positioned in the air gaps defined, respectively, by the opposing end poles of the armature plates 2 and 3.
  • the whole length of the hitherto known electromagnetic drive unit or assembly is necessarily increased due to the fact the air gaps for allowing movement of the armatures 2 and 3 are provided at both ends of the iron core 5 wound with the coil 4.
  • the coil assembly is disposed as overlying the armature block of a substantial thickness, an increase in height is involved, resulting in a bulky structure which contradicts to the trend of miniaturization of the electromagnetic relay.
  • an E-like iron core 7 having three legs 7a, 7b and 7c is used, wherein the mid leg 7b is wound with the coil 4, as is shown in Figure 2 of the accompanying drawings.
  • a C-like movable element block generally denoted by 12 is constituted by a permanent magnet 9 sandwiched between two pole pieces or plates 10 and 11 with the axis of magnetization of the magnet 9 extending perpendicularly to the pole pieces 10 and 11.
  • the legs or free ends of the pole pieces are, respectively, disposed within air gaps (also referred to as the working gaps) 8 defined by the three legs 7a, 7b and 7c of the E-like core 7.
  • the working gaps 8 defined by the three legs 7a, 7b and 7c of the E-like core 7.
  • This electromagnetic assembly is disadvantageous in that width of the assembly is remarkably increased to make it difficult or improper to incorporate the electromagnetic relay in electronic and electric apparatus which are increasingly required to be implemented in a miniature size.
  • Such large width may be explained by the fact that, assuming the required magnetic path cross-sectional area of the center leg 7b wound with the coil 4 to be represented by a, the total cross-sectional areas of three legs 7a, 7b and 7c amount to 3 X a, whereby the lateral dimension or width of the electromagnetic drive assembly is correspondingly enlarged, which is further increased due to the necessity of provision of the working air gap 8 which encloses the coil 4.
  • Another object of the present invention is to provide a polarized relay which is equipped with a miniaturized electromagnetic drive for operating relay contacts and exhibits a high sensitivity.
  • Still another object of the present invention is to provide an electromagnetic drive apparatus which can be used for a polarized relay either of latching type or monostable type.
  • a further object of the present invention is to provide an electromagnetic relay apparatus of an improved structure in which a coil spool assembly constituting a main part of the electromagnetic drive apparatus can be offhand secured to a terminal-pin (post) carrying base plate through a single stroke of operation in a much simplified manner.
  • the present invention is characterized in that a yoke structure for the electromagnetic drive assembly is miniaturized. More particularly, an iron core wound with a coil is so disposed as to extend substantially in parallel with a yoke body to constitute a yoke, wherein one end portion of the yoke is diburcated into two end portions between with the other end of the yoke, i.e. end portion of the iron core is disposed to thereby define air gaps (working gaps) through cooperation with the bifurcated end portions mentioned above.
  • a movable block constituted by a permanent magnet sandwiched between a pair of side pole pieces or plates is so disposed that the pole plates are movably positioned in the air gaps, respectively.
  • the iron core and the yoke body may be vertically juxtaposed in parallel or horizontally juxtaposed. In either case, the yoke has a pair of legs constituted by the core and the yoke body, respectively.
  • the working air gaps are provided only at one end of the electromagnetic drive.
  • the overall length of the electromagnetic drive can be significantly decreased.
  • the armature constituted in part by the movable block is positioned only at one end of the coil, the height of the electromagnetic drive can also be reduced.
  • the end of the core and the difurcated end portions of the yoke body can be positioned closer to the permanent magnet constituting a part of the movable block, leakage of the magnetic flux can be minimized to allow the contact driving structure having an enhanced sensitivity to be realized.
  • the electromagnetic drive according to the invention can thus be implemented in a much reduced size while assuring a high sensitivity.
  • the hitherto known electromagnetic drive such as shown in Figure 2 has an E-like yoke having a center core wound with a coil and a pair of lateral legs.
  • the yoke of the electromagnetic drive according to the invention has only two legs. This means that the lateral dimension or width of the electromagnetic drive apparatus can be reduced at least by a dimension corresponding to one leg.
  • the iron core wound with the coil has an end portion provided with a pair of magnetically shielding plates of different thicknesses attached, respectively, to the lateral sides of the iron core so that the exposed surfaces of the shielding plates are located equidistant from the center axis of the iron core.
  • a so-called monostable type electromagnetic drive can be realized.
  • the movable block of the latching type electromagnetic drive can be equally used without requiring adjustment of the force of contact biasing springs or need for additional parts, whereby the latching type can be readily transformed to the monostable type relay and vice versa.
  • the area over which one of the pole plates of the movable block is brought into contact with the iron core is selected smaller than the area over which the other pole plate is brought into contact with the core, whereby the monostable electromagnetic drive is realized. More specifically, in the case of the hitherto known polarized relay, the area over which the core contacts with either of the pole plates of the movable block remains constant. Accordingly, it is required to positively stabilize both the set and reset states of the polarized relay by overcoming the intrinsic resiliency of the movable contact bars.
  • the contacting area between the iron core and the pole plate of the movable block is selected greater in the reset state than in the set state which is established through excitation of the coil wound on the core. Accordingly, the polarized relay is stablized in the reset state in which the excitation of the coil is not effected. In this sense, this type structure may be referred to as the monostable relay.
  • the difference in the contacting area between the set and the reset states can be readily accomplished by slightly modifying the relative positions of both the pole plates of the movable block relative to the iron core.
  • the polarized electromagnetic relay apparatus in which a coil spool assembly is destined to be assembled on a terminalpin carrying base plate, comprises a coil spool having a pair of end collars, a flexible projecting piece formed in one of the collars and having a stopper, a supporting offset portion formed in the other collar, terminal members for the leads of the coil anchored in the other collar, a latch projection formed in the top surface of the base plate at a position near one end thereof and having a latch hole, a jaw like offset portion formed in the base plate at the other end opposite to aforementioned one end, wherein the coil spool assembly is fixedly mounted on the base plate through engagement of the flexible projecting piece with the latch hole and fitting of the jaw-like offset portion of the base plate onto the supporting offset portion of the spool.
  • the coil spool assembly can be offhand mounted fixedly on the base plate without requiring any other fixing or clamping members, while assuring a high precision positioning and Inexpensive
  • the invention will be descrived in conjunction with an electromagnetic drive unit and a polarized electromagnetic relay which incorporates the electromagnetic drive apparatus accoding to exemplary embodiments of the present invention.
  • Fig. 3 to 5 show a first exemplary embodiment of the invention which concerns an improved electromagnetic drive unit or apparatus, a polarized electromagnetic relay incorporating the electromagnetic drive apparatus and a structure of the electromagnetic relay which allows the relay to be assembled in a facilitated manner.
  • the electromagnetic drive apparatus comprises an iron core 13, a yoke 15 constituted by a yoke body 16 extending in parallel with the iron core 13 and having a free end portion bifurcated so as to form a pair of oppositely facing upstanding ears or legs 19a and 19b with a predetermined distance therebetween, wherein the free end or head portion 13a of the bar-like iron core 13 is disposed between the legs 19a and 19b with air gaps 20a and 20b being defined at both sides, respectively.
  • a movable block generally denoted by 23 which corresponds to the movable element 12 of the prior art electromagnetic drive shown in Fig. 2 is composed of a permanent magnet 21 sandwiched between a pair of magnetic side plates or pole pieces 22a and 22b in such an orientation in which the axis of magnetization of the permanent magnet 21 extends perpendicularly to the plates 22a and 22b.
  • This movable block 23 is generally in a C-like configuration and so disposed that the legs of the movable block 23 constituted by the magnetic pole plates 22a and 22b, respectively, are positioned in the air gaps 20a and 20b slideably in the lateral directions as indicated by an double-headed arrow Q-Q'.
  • a coil 14 is wound around the bar-like iron core 13. When the coil 14 is electrically energized in one direction, the core 13 is magnetized, whereby the movable block 23 is caused to move in the direction indicated by the arrow Q.
  • a reference numeral 30 generally indicates a bobbin or spool which is wound with the coil 14 and has a collar 31 at which a terminal post 32 is provided for leading out a coil conductor.
  • a front collar 33 is provided with a pair of guide projections 34a and 34b at a same height, each of the guide projections being generally in a L-like configulation each having a upstanding verticalear.
  • a numeral 35 denotes a rectangular through-hole into which the bar-like iron core 13 having a head or free end portion 13a is inserted.
  • the head portion 13a bears on the outer surface of the collar 33 and projects from the latter, while the other end portion denoted by 13b snugly fitted in a through-hole 18 formed in an upstanding wall 17 which is provided at the rear end of the yoke body 16 of the yoke 15, as viewed in Fig. 4.
  • the yoke body 16 extends in parallel with the iron core bar 13 wound with the coil 14. In opposition to the end of the yoke body 16 at which the upstanding wall 17 is formed.
  • the head or free end portion 13a of the bar-like iron core 13 is positioned at a center between the upstanding pole plates 19a and 19b, whereby air gaps or working gaps 20a and 20b are defined between the inner surface of the upstanding pole plate 19a and one side surface of the core end portion 13a on one hand and between the inner surface of the upstanding plate 19b and the other side surface of the end portion 13a on the other hand.
  • the movable block 23 is constituted by the permanent magnet 21 and the pair of magnetic side plates (pole pieces) 22a and 22b between which the permanent magnet 21 is sandwiched with the magnetization axis thereof extending perpendicularly to the plates 23a and 23b.
  • the movable block 23 thus assembled is generally in a C-like configulation as from the above and held together by a frame-like holder generally denoted by 26 in such a manner in which lower portions of the magnetic side or pole plates 22a and 22b are exposed outwardly from the holder 26 towards the rear as shown in Fig.5.
  • the frame-like holder 26 has arms 24a and 24b formed at an upper end thereof and extending in lateral directions, respectively.
  • arms 24a and 24b have respective lower edges formed with notches 25a and 25b.
  • the magnetic pole pieces 22a and 22b of the movable block 26 are movably positioned within the air gaps 22a and 22b defined between the core end portion 13 and the upstanding opposite magnetic plates 19a and 19b, respectively.
  • movable contact plates or bars 50a and 50b of relay contact mechanisms 49a and 49b engage in the notches 25a and 25b, respectively, of the arms 24a and 24b of the holder frame 26.
  • a reference numeral 38 denotes a cover which is on the relay structure generally designated by 39.
  • the terminal-pin carrying base plate 37 has a top surface 37a on which an engaging projection 40 having a latch hole 40a is formed at a position closer to the front edge of the base plate 37, as viewed in Figs. 5 and 7.
  • the latch hole or aperture 40a is of an elongated rectangular form in the case of the illustrated embodiment, the shape of the hole 40a may be modified as to comply with the configuration of flexible locking members 43 and 44 descrived hereinafter.
  • the base plate 40 has a rear edge in which a pair of jaw-like offset portions 41a and 41b are formed at both sides, respectively,with a central offset portion 42 being formed between the lateral offset portions 41a and 41b.
  • the front collar 33 has a pair of flexible or deformable projecting pieces 43 and 44 formed at the bottom end and projecting forwardly in parallel with each other.
  • the flexible projecting pieces 43 and 44 have respective free ends formed with slanted side surfaces 43a and 44a tpered towards the tips so as to define stopper surfaces 43b and 44b, respectively.
  • the lower portion of the rear collar 31 is formed integrally with a terminal holder 31a in which supporting Offset portions 45 are formed at both sides with a recess 46 being formed at a center bottom portion of the collar 31, as is clearly shown in Fig.6.
  • the coil spool assembly 30 is assembled with the terminal-pin (post) carrying base plate 37 by moving the coil spool assembly 30 in sliding contact with the top surface 37a of the pin carrying base plate 30 so that the flexsible projecting pieces 43 and 44 are inserted through the latch holes 40a, the jaw-like offset portions 41a and 41b are complementarily engaged with the supporting offset portions 45, respectively, and that the central projection 42 is fitted into the recess 46.
  • the tapered surfaces 43a and 44a bear on both lateral inner surfaces of the engaging projection 40 to be resiliently deformed toward each other.
  • the projecting pieces 43 and 44 are restored to the original state due to an intrinsic elastic restoring force. Then, the stoppers 43a and 43b snugly engage with the projection 40 to positively maintain the engaged states between the jaw-like offsets 41a and 41b and the supporting offsets 45 on one hand and between the center projection 42 and the recess 46 on the other hand, whereby the coil spool assembly 30 is integrally and fixedly combined with the terminal-pin carrying base plate 37. This assembling can be offhand accomplished through a single stroke of job in a much facilitated manner without fail. Additionally, the relative positioning of the coil spool assembly 30 and the base plate 37 can be attained with high precision.
  • Reference numerals 32 and 47 denote terminal posts to which leads 30a and 30b of the coil wound on the spool are connected by soldering or the like means.
  • a reference numeral 48 generally denotes a contact mechanism comprising movable contacts and stationary contacts.
  • the coil terminal-pin or post is anchored in the terminal-pin carrying base plate 37.
  • the coil terminal pin 47 is mounted on the terminal holder 31a formed integrally in the collar 31 of the coil spool assembly 30, the reason for ehich will be mentioned below.
  • the coil lead 30b is allowed to be connected to the coil terminal pin 32 by soldering or the like only after the coil spool assembly 30 has been secured to the base plate 37.
  • the free end or head portion 13a of the core 13 is polarized in the south (S) polarity when the core 13 is magnetized in the direction indicated by the arrow P by supplying the current to the coil 14 in the corresponding direction, whereupon the bifurcated opposite pole plates 19a and 19b of the yoke 15 are polarized in north (N) polarity, resulting in that the movable block 23 is moved in the direction indicated by the arrow Q, as is shown in Fig. 3.
  • the lateral movement of the block 23 is accompanied by the movement of the movable contacts 50a and 50b to make or break the circuit with the stationary contacts 49a and 49b.
  • Fig. 8 shows a second embodiment of the present invention.
  • a bar-like core 53 wound with a coil 14 is formed integrally with a yoke body 56 to constitute a yoke generally designated by 55 in which the core 7 is juxtaposed in parallel with the yoke body 56.
  • the other end portion of the yoke body 56 is bifurcated into a pair of oppositely facing pole plates 57a and 57b with a distance therebetween which is large enough to accommodate the head or end portion 53a of the core 53.
  • the opposite pole plates 57a and 57b are integrally connected to each other by a connecting web 58 extending below the core end portion 53a.
  • a reference numeral 23 generally denotes a movable block constituted by a permanent magnet 21 and a pair of pole plates or pieces 22a and 22b between which the permanent magnet 21 is fixedly mounted in the end abutting relation In a general C-like configuration.
  • the pole pieces 22a and 22b are laterally movably disposed within air gaps (working gap) defined between the core end portion 53a and the oppositely facing pole plates or legs 57a and 57b, respectively.
  • the movable block 23 is secured in a holder frame 26 to which the movable contact plates 50a and 50b of the contacts 49a and 49b described hereinbefore in ccnkunction with the first embodiment are connected so that the contacts 49a and 49b are opened or closed upon movement of the movable block 23.
  • the coil 14 is excited in the direction indicated by an arrow P in the state of the movable block 23 shown in Fig. 8, the core head or end portion 53a is magnetized with the south (S) polarity while the oppositely facing plates 57a and 57b are magnetized in the north (N) polarity.
  • the movable block 23 is caused to move in the direction indicated by an arrow Q, resulting in that the pole piece 22b being attracted to the plate 57b with the pole piece 22a being attracted to the core end portion 53a.
  • energization of the coil 14 in the direction indicated by an arrow P' causes the movable block 23 to be moved in thedirection indicated by an arrow Q' to be reset to the original position shown in Fig. 8.
  • Fig. 9 shows an electromagnetic drive apparatus of latching type according to a third exemplary embodiment of the present invention.
  • the structure of the electromagnetic drive shown in Fig. 9 is basically identical with that of the electromagnetic apparatus shown in Fig. 3 except that the connecting web of the oppositely disposed pole plates 19a and 19b is connected tothe yoke body 16 through an offset portion 59, as shown in Fig. 9(b).
  • This structure is effective to prevent the coil 14 of a large diameter wound on the bar-like iron core 13 from interfering with the yoke body 16.
  • Figs. 10 to 12 shows a fourth embodiment of the present Invention.
  • the electromagnetic drive apparatus is basically of the same structure as that of the first embodiment, the former differs from the latter in that a pair of magnetically shielding plates 60a and 60b are mounted on the head or end portion of the core 13 at both sides in opposition to each other, the core 13 being wound with a coil 14.
  • the magnetically shielding plate 60a is thicker than the other plate 60a, and both plates are press-fitted in recesses 61a and 61b formed in the core 13 so that the exposed surfaces of both shield plated 60a and 60b are located equidistant from the center axis of the core 13, as is shown in Fig. 11(a).
  • This core structure is employed in the monostable type relay, as described hereinafter. Such press-fitting can easily practiced in view of the fact that the magnetically shielding plate is usually of stainless steel while the core is generally of soft iron.
  • the magnetically shielding plate is usually of stainless steel while the core is generally of
  • Fig. 11 (b) shows a latching type core structure 113 in which magnetically shielding plates 160a and 160b of a substantially same thickness are press-fitted in the recesses 161a and 161b, respectively. Accordingly, when the magnetically shielding plates 160a and 160b of different thickness are press-fitted in the recesses 161a and 161b of the iron core 113 destined to be used in the latching or bistable type electromagnetic drive apparatus, the latter is converted to the monostable electromagnetic drive.
  • a recess 61a is formed only in one side surface of the iron core 13.
  • the exposed surface of both the shielding plates 60a and 60b can be positioned equidistantly from the center axis of the iron core 13.
  • Fig. 12(b) there is shown a structure of the iron core 113 used for a latching type electromagnetic drive apparatus in which the shielding plates 160a and 160b both of a same thickness are bonded to the flat side surfaces of the core 113, respectively.
  • excitation of the coil 14 in the direction indicated by an arrow P causes the free end (or head) portion of the bar-like iron core 13 to be polarized in S polarity and the oppositely facing pole plates 19a and 19b located at the bifurcated ends of the yoke body 16 are magnetized in N polarity. Since the free end portions of the magnetic pole pieces 22a and 22b of the movable block are magnetized in N and S polarities, respectively, under the action of the permanent magnet 21, the movable block 23 is translated in the direction indicated by an arrow Q under attracting and repulsing forces exerted to the magnetic pieces 19a and 19b. At that time, the movable contact plates linked to the movable block 23 are operated to close normally opened contacts.
  • the movable. block 23 Upon deenergization of the coil 14, the movable. block 23 is caused to move in the direction indicated by an arrow Q' under the intrinsic restoring force of the movable contact plate or par linked to the block 23 as well as under the influence of unbalanced magnetic action ascribable to the difference in thickness between the shielding plates 60a and 60b, resulting in that the normally closed contacts are closed.
  • a magnetic circuit is formed which extends from the N pole of the permanent magnet 21 through the plate 19a, the yoke body 16, the iron core 13, the shielding plate 60b and the pole piece 22b to the S-pole of the permanent magnet 21, whereby the electromagnet drive is stabilized in this reset state.
  • this electromagnet,ic drive performs a so-called monostable operation.
  • Figs. 13 to 17 show an electromagnetic drive apparatus according to a fifth exemplary embodiment of the present invention.
  • the basis structure of this electromagnetic drive is substantially identical with that of the first embodiment described hereinbefore.
  • a coil 14 is wound on a spool 30 which has an iron core 13 inserted into a center bore 35 to be thereby combined integrally with a yoke 15.
  • the structure and operation of the movable block 23 is basically same as those of the preceding embodiments. Accordingly, repeated description will be unnecessary.
  • the yoke 15 is installed on a terminal-pin carrying base plate 37 having mechanical contact switches 49a and 49b mounted at both sides, respectively.
  • the movable block 23 is mounted movably in the directions indicated by a double-headed arrow Q-Q' in such an arrangement in which projections 22c and 22d of the pole pieces 22a and 22b are disposed within air gaps defined between the iron core 13 of the yoke 15 and the oppositely facing plates 19a of the yoke body 16, respectively.
  • the projections 22c and 22d of the pole pieces 22a and 22b are positioned at different heights so that the area over which the projection 22c is brought into contact with the pole plate 19a is greater than the area over which the projection 22d contacts with the other plate 19b.
  • the contacts 49a and 49b have respective movable contact bars 50a and 50b which are secured to terminal posts 62a and 62b, respectively, at rear ends thereof.
  • the movable contacts constitute, respectively, normally closed contacts and normally opened contacts in cooperation with counterpart fixed contacts.
  • the movable contact bars 50a and 50b are engaged in notches 25a and 25b formed in arms 24a and 24b of the holder frame 26 and imparted with an elastic restoring force so that the movable contact bars are biased to the normally closed position.
  • the movable block 23 is displaced in the direction indicated by the arrow head Q' (Fig. 13) under the intrinsic resilient restoring force of the movable contact bars 50a and 50b in the deenergized state of the magnet coil, whereby the closed magnetic path is formed which extends from the N-pole of the permanent magnet 21 , through the pole piece 22a, the plate 19a, the core 13 and the plate 19b to the S-pole of the permanent magnet 21, to maintain the movable contacts at the normally closed position.
  • the movable block 23 is stable (refer to Fig. 14).
  • excitation or energization of the coil 14 in the direction indicated by the arrow P brings about appearance of S-polarity in the core head (free end) portion 13a of the yoke 15 while the end portions of the opposite plates 19a and 19b are magnetized in N-polarity, as the result of which the movable block 23 is caused to move in the direction indicated by the arrow Q (Fig. 13) to thereby change over the movable contacts from the normally closed position to the normally opened position.
  • the intrinsic spring force (restoring force) exerted by the movable contact bars or leaves 50a and 50b overcomes the magnetic force of the magnetic path which extends from the N-pole of the permanent magnet 21 through the pole piece 22a, the core 13, the plate 19b and the pole piece 22b to the S-pole of the magnet 21. Consequently, the movable block 23 is restored to the starting position under the restoring spring force, as indicated by the arrow Q'. In this way, the electromagnetic relay performs a so-called monostable switching operation.
  • Fig. 17 Operation characteristics of an electromagnetic drive according to the invention are graphically illustrated in Fig. 17, in which the stroke of the movable block 23 is taken along the abscissa, while external force applied to the movable block as it moves is taken along the ordinate.
  • a curve I represents load characteristics
  • a curve It represents attraction characteristics upon excitation of the coil
  • a curve IV represents attraction characteristic of the permanent magnet 21.
  • R 1 and R 2 represents at which the movable contacts are brought into contact with the respective stationary contacts.
  • the movable block 23 may be so constituted as to perform rotational movement instead of the linear displacement.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Electromagnets (AREA)
EP84302339A 1984-04-04 1984-04-05 Entraînement électromagnétique et relais polarisé Withdrawn EP0157029A1 (fr)

Priority Applications (5)

Application Number Priority Date Filing Date Title
EP84302339A EP0157029A1 (fr) 1984-04-04 1984-04-05 Entraînement électromagnétique et relais polarisé
EP88110935A EP0303054B1 (fr) 1984-04-04 1984-04-05 Entrainement électromagnétique et relais polarisé
US06/762,860 US4626813A (en) 1984-04-04 1985-08-06 Electromagnetic drive and polarized relay
US06/914,521 US4727344A (en) 1984-04-04 1986-10-02 Electromagnetic drive and polarized relay
AT88110935T ATE90474T1 (de) 1984-04-04 1988-07-08 Elektromagnetischer antrieb und polarisiertes relais.

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US59671784A 1984-04-04 1984-04-04
EP84302339A EP0157029A1 (fr) 1984-04-04 1984-04-05 Entraînement électromagnétique et relais polarisé
US06/762,860 US4626813A (en) 1984-04-04 1985-08-06 Electromagnetic drive and polarized relay

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225038A2 (fr) * 1985-10-25 1987-06-10 Nec Corporation Relais électromagnétique polarisé
EP0272409A1 (fr) * 1986-10-31 1988-06-29 Alcatel SEL Aktiengesellschaft Relais plat polarisé
FR2619956A1 (fr) * 1987-08-27 1989-03-03 Schrack Elektronik Ag Commande de relais pour relais polarise
AT388258B (de) * 1987-05-13 1989-05-26 Schrack Elektronik Ag Monostabiles elektromagnetisches relais
WO1994016456A1 (fr) * 1993-01-13 1994-07-21 Hengstler Bauelemente Gmbh Relais de securite comportant un jeu de contacts guide et une commande monostable
CN105071628A (zh) * 2011-01-17 2015-11-18 Zf腓德烈斯哈芬股份公司 感应发电机及用于制造感应发电机的方法

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DE2728629A1 (de) * 1976-07-09 1978-01-12 Manumesure Conches En Ouche Vorrichtung, die einen elektromagneten, z.b. denjenigen eines relais, bildet
DE2934558A1 (de) * 1978-08-29 1980-03-13 Sauer Hans Elektromagnetisches relais
DE3320000A1 (de) * 1982-07-16 1984-01-19 Fujisoku Electric Co., Ltd., Kawasaki Elektromagnetisches relais

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2728629A1 (de) * 1976-07-09 1978-01-12 Manumesure Conches En Ouche Vorrichtung, die einen elektromagneten, z.b. denjenigen eines relais, bildet
DE2934558A1 (de) * 1978-08-29 1980-03-13 Sauer Hans Elektromagnetisches relais
DE3320000A1 (de) * 1982-07-16 1984-01-19 Fujisoku Electric Co., Ltd., Kawasaki Elektromagnetisches relais

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PATENT ABSTRACTS OF JAPAN vol. 7, no. 36, 15th February 1983, page (E158) (1181); & JP-A-57-188816 (MATSUSHITA DENKO) 19-11-1982 *

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0225038A2 (fr) * 1985-10-25 1987-06-10 Nec Corporation Relais électromagnétique polarisé
EP0225038A3 (en) * 1985-10-25 1989-07-26 Nec Corporation Polarized electromagnetic relay
EP0272409A1 (fr) * 1986-10-31 1988-06-29 Alcatel SEL Aktiengesellschaft Relais plat polarisé
US4772865A (en) * 1986-10-31 1988-09-20 Standard Elektrik Lorenz Ag Flat-type polarized relay
AT388258B (de) * 1987-05-13 1989-05-26 Schrack Elektronik Ag Monostabiles elektromagnetisches relais
FR2619956A1 (fr) * 1987-08-27 1989-03-03 Schrack Elektronik Ag Commande de relais pour relais polarise
DE3826624A1 (de) * 1987-08-27 1989-03-09 Schrack Elektronik Ag Relaisantrieb fuer ein polarisiertes relais
US4881054A (en) * 1987-08-27 1989-11-14 Schrack Elektronik-Aktiengesellschaft Relay drive for polarized relay
WO1994016456A1 (fr) * 1993-01-13 1994-07-21 Hengstler Bauelemente Gmbh Relais de securite comportant un jeu de contacts guide et une commande monostable
CN105071628A (zh) * 2011-01-17 2015-11-18 Zf腓德烈斯哈芬股份公司 感应发电机及用于制造感应发电机的方法
CN105071628B (zh) * 2011-01-17 2020-03-06 Zf腓德烈斯哈芬股份公司 感应发电机及用于制造感应发电机的方法

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