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WO2022201373A1 - Actionneur électromagnétique - Google Patents

Actionneur électromagnétique Download PDF

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Publication number
WO2022201373A1
WO2022201373A1 PCT/JP2021/012335 JP2021012335W WO2022201373A1 WO 2022201373 A1 WO2022201373 A1 WO 2022201373A1 JP 2021012335 W JP2021012335 W JP 2021012335W WO 2022201373 A1 WO2022201373 A1 WO 2022201373A1
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WO
WIPO (PCT)
Prior art keywords
coil
core
yoke
magnetic
fixed
Prior art date
Application number
PCT/JP2021/012335
Other languages
English (en)
Japanese (ja)
Inventor
康宏 神納
真也 渡邉
Original Assignee
三菱電機株式会社
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 三菱電機株式会社 filed Critical 三菱電機株式会社
Priority to JP2023508271A priority Critical patent/JP7435899B2/ja
Priority to PCT/JP2021/012335 priority patent/WO2022201373A1/fr
Publication of WO2022201373A1 publication Critical patent/WO2022201373A1/fr

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H50/00—Details of electromagnetic relays
    • H01H50/16—Magnetic circuit arrangements
    • H01H50/36—Stationary parts of magnetic circuit, e.g. yoke
    • H01H50/42—Auxiliary magnetic circuits, e.g. for maintaining armature in, or returning armature to, position of rest, for damping or accelerating movement
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H51/00—Electromagnetic relays
    • H01H51/22—Polarised relays

Definitions

  • the present invention relates to an electromagnetic actuator that attracts a movable core with the magnetic flux of a permanent magnet and releases the movable core with coil excitation.
  • a mechanism using an electromagnetic actuator is used to trip the contacts.
  • the coil of the electromagnetic actuator is excited by an external power supply, and the movable iron core of the electromagnetic actuator is released. , the contact opens.
  • Patent Document 1 Japanese Patent Application Laid-Open No. 61-128436
  • This electromagnetic actuator includes a drive spring, a permanent magnet, a coil that cancels the magnetic flux of the permanent magnet, a yoke that surrounds the coil, a movable iron core, and a magnetic flux diverter.
  • a flux diverter is connected to the yoke and serves to divert a portion of the magnetic flux of the permanent magnet to the yoke.
  • the magnetic flux of the permanent magnet passes through the magnetic attraction magnetic path, which is the magnetic path that passes through the attraction surface of the movable iron core, thereby exerting a magnetic attraction force on the movable iron core.
  • the attraction magnetic path is a magnetic path that produces a magnetic attraction force.
  • the magnetic flux of the permanent magnet passes through a shunt magnetic path, which is a magnetic path that does not pass through the attracting surface of the movable iron core.
  • a shunt magnetic path is a magnetic path that does not generate a magnetic attraction force.
  • the magnetic flux passing through the movable core is canceled, and most of the magnetic flux of the permanent magnet bypasses the shunt magnetic path, thereby reducing the magnetic attraction force applied to the movable core.
  • the magnetic attraction force applied to the movable iron core falls below the spring force of the drive spring, the movable iron core is released and driven.
  • the magnetic resistance of the shunt magnetic path is determined by the magnetic path width, which is the width of the magnetic path of the magnetic flux diverter, the magnetic path length, which is the length of the magnetic path of the magnetic flux diverter, and the contact portion between the magnetic flux diverter and the yoke.
  • the width of the contact portion between the magnetic flux diverter and the yoke is small, there is a problem that the magnetic gap variation at the contact portion between the magnetic flux diverter and the yoke increases the variation in the reluctance of the shunt magnetic path. .
  • the amount of magnetic flux flowing through the shunt magnetic path tends to vary in the attracting and holding state, and the magnetic attraction force of the movable iron core also varies greatly.
  • the present invention has been made in view of the above problems, and its object is to reduce variations in the magnetic resistance of the shunt magnetic path and to provide an electromagnetic actuator with small variations in the magnetic attraction force.
  • An electromagnetic actuator includes a cylindrical coil, a movable iron core disposed on the inner peripheral side of the coil, protruding toward one end of the coil and movable along the central axis of the coil, and the other end of the coil.
  • a magnetic yoke that surrounds the outer periphery of the coil and is in contact with the fixed core on the inside; a drive spring that applies a spring force toward one end of the movable core;
  • the fixed core has a first narrow passage portion whose one end direction is narrower than the one end direction width of the portion where the fixed core and the yoke come into contact with each other.
  • the shunt magnetic path has a narrow path, and the width of the contact portion between the fixed core and the yoke in the shunt magnetic path is larger than the width of the narrow path.
  • the magnetic resistance at the narrow path is greater than that at the contact between the yoke and the yoke. Therefore, variations in the magnetic resistance of the shunt magnetic path are reduced, and variations in the magnetic attractive force are reduced. This makes it possible to obtain an electromagnetic actuator with stable performance.
  • FIG. 1 is an overall view of an electromagnetic actuator according to Embodiment 1;
  • FIG. 1 is a cross-sectional perspective view of an electromagnetic actuator according to a first embodiment;
  • FIG. 1 is a cross-sectional front view of an electromagnetic actuator according to a first embodiment;
  • FIG. 7 is a cross-sectional front view of an electromagnetic actuator according to a second embodiment;
  • FIG. 11 is a cross-sectional front view of an electromagnetic actuator according to a third embodiment;
  • FIG. 11 is an overall view of an electromagnetic actuator according to a fourth embodiment;
  • FIG. 11 is a cross-sectional perspective view of an electromagnetic actuator according to a fourth embodiment;
  • FIG. 11 is a cross-sectional front view of an electromagnetic actuator according to a fifth embodiment;
  • FIG. 11 is a cross-sectional front view of an electromagnetic actuator according to a sixth embodiment;
  • FIG. 11 is an overall view of an electromagnetic actuator according to Embodiment 7;
  • FIG. 1 is an overall outline view of an electromagnetic actuator according to Embodiment 1.
  • FIG. 2 is a cross-sectional perspective view of the electromagnetic actuator according to the first embodiment.
  • FIG. 3 is a cross-sectional front view of the electromagnetic actuator according to the first embodiment.
  • the electromagnetic actuator includes a movable core 1 movable along the central axis of the coil 5, a yoke 2, a fixed core 3, a permanent magnet 4, a coil 5, and a drive spring 6.
  • the yoke 2 is arranged so as to surround the coil 5 and forms a magnetic circuit together with the movable core 1, the fixed core 3 and the permanent magnet 4.
  • the movable iron core 1 is arranged on the inner peripheral side of the coil 5 , protrudes toward one end of the coil 5 , and is movable along the central axis direction of the coil 5 .
  • the yoke 2 has an upper yoke 2a and an outer yoke 2b.
  • the magnetic circuit of the electromagnetic actuator has an attraction magnetic path M2 and a shunt magnetic path M3.
  • the attraction magnetic path M2 passes through the permanent magnet 4, the fixed core 3, the movable core 1, the upper yoke 2a and the outer yoke 2b.
  • the branch magnetic path M3 passes through the permanent magnet 4, the fixed core 3, and the outer yoke 2b, and bypasses the fixed core 3 to the outer yoke 2b without passing through the movable core 1.
  • the magnetic path in which the attracting magnetic path M2 and the shunt magnetic path M3 are common is shown in the drawing as a common magnetic path M1.
  • the common magnetic path M1 is not closed as a magnetic path.
  • the movable iron core 1 In the attracting and holding state of the electromagnetic actuator, the movable iron core 1 is in a state of being attracted to the fixed iron core 3 by the magnetic attraction force due to the magnetic flux of the attracting magnetic path M2.
  • the magnetic flux generated by the permanent magnet 4 is divided by the magnetic resistance of the attracting magnetic path M2 and the magnetic resistance of the shunt magnetic path M3.
  • the coil 5 has a bobbin 5a and a coil winding 5b.
  • the drive spring 6 is installed so as to apply a force in the opposite direction to the magnetic attraction force applied to the movable iron core 1 in the attracting and holding state.
  • the magnetic attraction force applied to the movable iron core 1 is greater than the elastic force of the drive spring 6 , and the movable iron core 1 is attracted to the fixed iron core 3 .
  • the flow for releasing the movable core 1 is as follows. First, when the coil 5 is energized, the magnetic flux generated by the permanent magnet 4 passing through the attracting magnetic path M2 is canceled, and the magnetic flux generated by the permanent magnet 4 is bypassed to the shunt magnetic path M3. As a result, the magnetic attraction force applied to the movable iron core 1 is reduced, and the magnetic attraction force falls below the spring force of the drive spring 6 . Therefore, the movable iron core 1 is driven upward in FIGS. 1, 2 and 3 by the spring force. That is, the driving direction is the upward direction as indicated by the arrow in FIG. 1, which is the extension direction of the driving spring. Further, the driving direction is the one end direction of the coil 5 . The above operation releases the movable core 1 . In other words, during the releasing operation in which the movable core 1 and the fixed core 3 are separated, a shunt magnetic path M3 is generated from the permanent magnet 4 through the first narrow path portion and the outer yoke 2b.
  • a slit 3a which is an air gap provided in the fixed core 3, is provided in a portion forming the shunt magnetic path M3 of the fixed core 3, and a first narrow path portion 3b is formed.
  • the slit 3a is provided so as to reduce the width of the fixed core in the driving direction.
  • the slits 3 a may be formed by cutting grooves in the fixed core 3 or by drilling holes in the fixed core 3 .
  • the slit 3a may be formed by bending the outer circumference of the fixed core 3. As shown in FIG.
  • the first narrow passage portion 3b becomes a portion with high magnetic resistance due to magnetic saturation.
  • Width W1 in the drive direction at contact portion 8 between fixed core 3 and outer yoke 2b is larger than width W2 of the first narrow path portion of which the width in the drive direction is reduced as slit 3a. Therefore, the magnetic resistance of the contact portion 8 between the fixed core 3 and the outer yoke 2b can be made sufficiently smaller than the magnetic resistance of the first narrow path portion 3b. Therefore, the magnetic resistance of the shunt magnetic path M3 is mainly defined by the magnetic resistance of the first narrow path portion 3b.
  • the influence of variations in the magnetic resistance of the contact portion 8 caused by variations in the contact surface between the fixed core 3 and the outer yoke 2b on the magnetic resistance of the shunt magnetic path can be reduced.
  • the magnetic resistance of the first narrow passage portion 3b can be defined by the length G1 of the first narrow passage portion 3b.
  • FIG. 4 is a sectional front view of an electromagnetic actuator according to Embodiment 2 of the present invention, which corresponds to FIG. 3 according to Embodiment 1.
  • the fixed core 3 is formed with a slit 3a by a wedge-shaped groove. Since the wedge-shaped grooves can be easily manufactured by press working or the like, it is possible to simultaneously realize a reduction in processing cost and a stable suction force.
  • Embodiment 3 An electromagnetic actuator according to a third embodiment of the present invention will be described below with reference to FIG. 5 is a cross-sectional front view of an electromagnetic actuator according to Embodiment 3 of the present invention, which corresponds to FIG. 3 according to Embodiment 1.
  • the fixed core 3 is provided with slits 3a from both upper and lower directions to form a first narrow passage portion 3b.
  • slits 3a from both the upper and lower sides of the fixed core 3, it is possible to form the first narrow passage portion 3b with a slit having a small depth. Therefore, the fixed core 3 can be easily processed. As a result, it is possible to simultaneously achieve a reduction in processing costs and a stable suction force.
  • both the vertical direction in the above description is the direction in which the driving direction is the upward direction and the direction opposite to the driving direction is the downward direction.
  • FIG. 6 is an overall outline view of an electromagnetic actuator according to Embodiment 4 of the present invention, and corresponds to FIG. 1 according to Embodiment 1.
  • FIG. 7 is a cross-sectional perspective view of an electromagnetic actuator according to Embodiment 4, and corresponds to FIG. 2 according to Embodiment 1.
  • FIG. Since other configurations are the same as those of the first embodiment, description thereof is omitted.
  • the driving direction is upward as indicated by the arrow in FIG. 6, which is the extension direction of the driving spring.
  • the yoke 2 has an upper yoke 2a, an outer yoke 2b having a tubular magnetic pipe, and a lower yoke 2c having a magnetic material.
  • the fixed iron core 3 and the outer yoke 2b can be connected with good accuracy by fitting by forming the outer yoke 2b of a pipe.
  • variations in the magnetic resistance of the contact portion 8 between the fixed core 3 and the outer yoke 2b can be reduced, and a more stable attractive force can be obtained.
  • Embodiment 5 An electromagnetic actuator according to Embodiment 5 of the present invention will be described below with reference to FIG. 8 is a cross-sectional front view of an electromagnetic actuator according to Embodiment 5, and corresponds to FIG. 4 according to Embodiment 2. FIG. Since other configurations are the same as those of the second embodiment, description thereof is omitted.
  • the fixed core 3 is provided with a second narrow passage portion 7 between the branch magnetic path M3 and the permanent magnet 4.
  • the diameter D2 of the second narrow passage is smaller than the diameter D1 of the permanent magnet 4 .
  • the second narrow passage portion 7 becomes magnetically saturated. Magnetic saturation of the second narrow passage limits the magnetic flux supplied to the magnetic circuit. Therefore, even if the magnetic flux generated by the permanent magnet 4 fluctuates due to thermal demagnetization or the like, the amount of magnetic flux flowing through the attraction magnetic path M2 and the shunt magnetic path M3 does not change.
  • Thermal demagnetization is a phenomenon in which magnetic flux decreases due to fluctuation or reversal of magnetic moment due to thermal vibration when a magnet magnetized at room temperature is exposed to high temperature. As a result, the magnetic attraction force applied to the movable iron core 1 can be further stabilized, and an electromagnetic actuator with stable performance against thermal demagnetization of the magnet can be obtained.
  • Embodiment 6 An electromagnetic actuator according to a sixth embodiment of the present invention will be described below with reference to FIG. 9 is a cross-sectional front view of an electromagnetic actuator according to Embodiment 6, and corresponds to FIG. 4 according to Embodiment 2. FIG. Since other configurations are the same as those of the second embodiment, description thereof is omitted.
  • the stationary core 3 is configured by combining a sub-stationary core 31 and a magnetic ring 32 .
  • the magnetic ring 32 has a hole in the center and is connected by fitting with the protrusion of the sub-stationary core 31 .
  • the sub-stationary core 31 and the magnetic ring 32 have a gap at least partially to form the slit 3a.
  • a first narrow passage portion 3b is formed at a position corresponding to the position of the slit 3a.
  • the magnetic ring 32 is connected to the outer yoke 2b, and the width of the contact portion 8 is larger than the width of the narrow passage portion 3b.
  • the slit 3a is formed and the first narrow passage portion 3b is formed without forming a groove in the fixed core 3 by machining. For this reason, a processing step for carving grooves becomes unnecessary, and processing costs can be reduced. As a result, it is possible to reduce the processing cost and stabilize the suction force at the same time.
  • FIG. 10 is an overall view of an electromagnetic actuator according to Embodiment 7, and corresponds to FIG. 1 according to Embodiment 1.
  • FIG. 10 the coil 5 is not shown. Since other configurations are the same as those of the first embodiment, description thereof is omitted.
  • the fixed core 3 is provided with a hole 3c to form the first narrow passage portion 3b.
  • the hole 3c is a hole provided in a plane perpendicular to the driving direction of the fixed core 3, and extends in a direction parallel to the surface where the fixed core 3 and the outer yoke 2b contact each other.
  • a width W3 of the contact portion 8 where the surface of the fixed core contacts the yoke is larger than a width W4 of the first narrow path portion in the direction parallel to the contact portion 8 . Therefore, the magnetic resistance of the contact portion 8 between the fixed core 3 and the outer yoke 2b can be made sufficiently smaller than the magnetic resistance of the first narrow path portion 3b.
  • the first narrow passage portion 3b can be formed without grooving, processing becomes easier. As a result, it is possible to simultaneously achieve a reduction in processing costs and a stable suction force.
  • each embodiment can be freely combined, and each embodiment can be appropriately modified or omitted within a consistent range.
  • Second narrow passage 8 Contact portion 31 Substationary iron core 32 Magnetic ring W1 Width of contact portion W2 Width of first narrow passage D1 Diameter of permanent magnet D2 is the diameter of the second narrow path portion, M1 is the common magnetic path, M2 is the attraction magnetic path, and M3 is the shunt magnetic path.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Electromagnets (AREA)

Abstract

Actionneur électromagnétique comprenant : une bobine cylindrique (5) ; un noyau mobile (3) qui est disposé de manière circonférentielle vers l'intérieur de la bobine, fait saillie dans la direction d'une extrémité de la bobine, et est librement mobile le long de la direction d'axe central de la bobine ; un noyau fixe (1) qui est disposé sur un autre côté d'extrémité de la bobine ; une culasse magnétique (2) qui est disposée de manière à entourer la périphérie extérieure de la bobine et qui entre en contact avec le noyau fixe sur le côté intérieur ; un ressort d'entraînement (6) qui confère une force de rappel au noyau mobile dans une direction ; et un aimant permanent (4) qui génère un flux magnétique pour adsorber le noyau mobile vers le noyau fixe. Le noyau fixe comprend une première partie trajet étroit dont une direction d'extrémité est plus étroite que la largeur dans une direction d'extrémité au niveau d'un site où le noyau fixe et la culasse entrent en contact l'un avec l'autre, et pendant une opération de libération lorsque le noyau mobile et la partie fixe sont séparés, un trajet magnétique d'écoulement de bifurcation est généré, lequel passe à travers la culasse, au moyen de la première partie trajet étroit, à partir de l'aimant permanent.　
PCT/JP2021/012335 2021-03-24 2021-03-24 Actionneur électromagnétique WO2022201373A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2023508271A JP7435899B2 (ja) 2021-03-24 2021-03-24 電磁アクチュエータ
PCT/JP2021/012335 WO2022201373A1 (fr) 2021-03-24 2021-03-24 Actionneur électromagnétique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2021/012335 WO2022201373A1 (fr) 2021-03-24 2021-03-24 Actionneur électromagnétique

Publications (1)

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WO2022201373A1 true WO2022201373A1 (fr) 2022-09-29

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PCT/JP2021/012335 WO2022201373A1 (fr) 2021-03-24 2021-03-24 Actionneur électromagnétique

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JP (1) JP7435899B2 (fr)
WO (1) WO2022201373A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49126531U (fr) * 1973-02-28 1974-10-30
JPS61128436A (ja) * 1984-11-22 1986-06-16 メルラン、ジエラン 磁気的に保持される有極電磁リレー
WO2011033654A1 (fr) * 2009-09-18 2011-03-24 三菱電機株式会社 Dispositif à électroaimant de type à déblocage

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS49126531U (fr) * 1973-02-28 1974-10-30
JPS61128436A (ja) * 1984-11-22 1986-06-16 メルラン、ジエラン 磁気的に保持される有極電磁リレー
WO2011033654A1 (fr) * 2009-09-18 2011-03-24 三菱電機株式会社 Dispositif à électroaimant de type à déblocage

Also Published As

Publication number Publication date
JP7435899B2 (ja) 2024-02-21
JPWO2022201373A1 (fr) 2022-09-29

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