Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H47/00—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
  • H01H47/02—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
  • H01H47/04—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current
  • H01H47/10—Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay for holding armature in attracted position, e.g. when initial energising circuit is interrupted; for maintaining armature in attracted position, e.g. with reduced energising current by switching-in or -out impedance external to the relay winding
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H50/00—Details of electromagnetic relays
  • H01H50/64—Driving arrangements between movable part of magnetic circuit and contact
  • H01H50/66—Driving arrangements between movable part of magnetic circuit and contact with lost motion
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H5/00—Snap-action arrangements, i.e. in which during a single opening operation or a single closing operation energy is first stored and then released to produce or assist the contact movement
  • H01H5/02—Energy stored by the attraction or repulsion of magnetic parts
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H50/00—Details of electromagnetic relays
  • H01H50/54—Contact arrangements
  • H01H50/541—Auxiliary contact devices

Definitions

• the present invention relates to an electromagnetic switching device with at least one drive coil which, when acted upon by a pull-in current, shifts a contact driver from a rest position into an actuating position, the contact driver having an opening driving element by means of which when the contact driver is moved into the actuating position when an intermediate position is reached a contact bridge of an opener is lifted from counter contacts of the opener in the rest position and the actuation position of the opening-entraining division.
• Such an electromagnetic switching device is generally known.
• the contact bridge is also constantly pressed against the opening-driving element in the actuated position via a reset element.
• the contact bridge is therefore lowered again to the counter contacts when the opening-driving division is reached.
• such a lowering when the opening driving position is reached is undesirable. Rather, the switching behavior of the break contact should have a hysteresis.
• the object of the present invention is to provide an electromagnetic switching device in which the opener can be operated with a hysteresis.
• the contact driver has a closing driving element, by means of which, when the contact driver is moved into the rest position when a closing driving position lying between the rest position and the opening driving position is reached, the contact bridge is moved towards the counter contacts and that the opener has one Holding device is assigned, which holds the contact bridge in an open position, in which the contact bridge is lifted from the mating contacts, as long as the contact driver is moved from the open driving position to the closing driving position.
• the holding device is particularly simple if the holding device is designed as a magnetic device and the contact bridge is at least partially made of a ferromagnetic material.
• the magnetic device is designed as a permanent magnetic device, the magnetic device is particularly effective.
• the magnet device has two magnets and one of the magnets acts on one of two end regions of the contact bridge, the magnet device is particularly simple in construction.
• the stray field caused by the magnetic device acts as a blowing field for any arcing that may occur when the contact bridge is lifted from the mating contacts.
• the contact bridge has a rear side facing away from the counter contacts, which is made of a ferromagnetic material, the magnet device exerts a pulling and holding force on the contact bridge. This is particularly important in the case of applications at risk of vibration.
• the opening driving element is arranged in such a way that it lifts the contact bridge up to an intermediate lifting position from the mating contacts, and the holding device is designed such that it transfers the contact bridge from the intermediate lifting position into the opening position, the risk of damage to the contact bridge is reduced in a simple manner Avoid transfer to the open position.
• the closing driving element is arranged in such a way that it deflects the contact bridge into an intermediate lowering position from the open position, and a reset element is assigned to the contact bridge, which lowers the contact bridge from the intermediate lowering position to the mating contacts, the risk of damage to the contact bridge is reduced in a simple manner Lowering on the counter contacts avoided.
• the restoring element is designed as a restoring spring.
• the return spring can be supported, for example, on the one hand on the contact bridge and on the other hand on a bearing which is stationary with respect to the switching device.
• the electromagnetic switching device can be switched over in a particularly simple manner. on holding current.
• this arrangement it is possible with this arrangement to switch the switching device from pull-in to holding current only shortly before reaching the actuation position and to switch on the pull-in current only shortly before reaching the rest position.
• FIG. 1 shows an electromagnetic switching device with a current setting device
• FIG. 2 shows a switching device with a contact driver in the rest position
• FIG. 3 shows a switching device with a contact driver in the actuating position
• FIG. 4 shows the switching device from FIG. 1 from above and FIG. 5 shows a hysteresis diagram.
• an electromagnetic switching device has a drive coil 1. If an actuation command is given to a current setting device 2 for the drive coil 1, the current setting device 2 acts on the Drive coil 1 with a current I.
• the current I has at least the size of a starting current I A.
• a contact driver 3 shown only schematically in FIG. 1 —is displaced from a rest position R into an actuation position B.
• a main contact 4 of the switching device is not actuated and an NC contact 5 is closed.
• the contact carrier 3 By moving the contact carrier 3, the main contact 4 is actuated and the break contact 5 is opened.
• the opener 5 bridges a resistor 6.
• the drive coil 1 is thus only connected to the current setting device 2 via the resistor 6, but no longer without resistance via the opener 5. Therefore, when the opener 5 opens, the current I drops to a holding current I H. Conversely, when the opener 5 closes, the current I increases again to the starting current I A.
• the opener 5 is thus connected to the current setting device 2 in such a way that a change in the current when the opener 5 is opened or closed
• the contact driver 3 has an opening driving element 7.
• the opening driving element 7 is designed as a driving surface.
• a contact bridge 8 of the opener 5 is lifted from mating contacts 9 of the opener 5 when the contact driver 3 is moved into the actuation position B.
• the contact bridge 8 is then only lifted from the mating contacts 9 when the contact driver
• the contact bridge 8 is lifted off against the force of a restoring element 10, which is designed as a restoring spring according to FIGS. 2 to 4.
• the return spring 10 is supported on the one hand on the contact bridge 8 and on the other hand on a bearing 11 which is stationary with respect to the switching device is.
• the return spring 10 is guided to the side by suitable, generally known guide elements. For the sake of clarity, these are therefore not shown.
• the opening driver element 7 is arranged in such a way that it lifts the contact bridge 8 into an intermediate lifting position ZI.
• the contact bridge 8 When the contact bridge 8 has reached the intermediate lifting position ZI, it is exposed to a magnetic force which is exerted on it by a magnetic device 12.
• the magnet device 12 serves as a holding device 12 and is assigned to the opener 5.
• the magnet device has two permanent magnets 13, 14. It is therefore designed as a permanent magnet device.
• One of the permanent magnets 13, 14 acts on one of two end regions 15, 16 of the contact bridge 8.
• the contact bridge 8 consists at least partially of a ferromagnetic material.
• the contact bridge 8 has a rear side 17 which faces away from the mating contacts 9 and is made of a ferromagnetic material.
• the restoring element 10 and the magnetic device 12 are matched to one another and the intermediate lifting position ZI is selected such that in the intermediate lifting position ZI the magnetic force exerted by the magnetic device 12 on the contact bridge 8 is greater than the restoring force which the restoring element 10 exerts on the contact bridge 8 ,
• the magnet device 12 therefore transfers the contact bridge from the intermediate lifting position ZI to an open position in which the contact bridge 8 bears against the permanent magnets 13, 14 and is lifted off the counter contacts 9.
• H- P P ⁇ & ⁇ ⁇ & CO rt ⁇ P ) rt iQ ⁇ H-tt X 3 PP rt to h- 1

Landscapes

• Engineering & Computer Science (AREA)
• Power Engineering (AREA)
• Physics & Mathematics (AREA)
• Electromagnetism (AREA)
• Driving Mechanisms And Operating Circuits Of Arc-Extinguishing High-Tension Switches (AREA)
• Valve Device For Special Equipments (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7922276

Family Applications (1)

Country Status (4)

Cited By (1)

Citations (2)

Family Cites Families (2)

• 1999
  • 1999-09-16 DE DE19944462A patent/DE19944462C1/de not_active Expired - Fee Related
• 2000
  • 2000-09-06 EP EP00963966A patent/EP1212772B1/de not_active Expired - Lifetime
  • 2000-09-06 WO PCT/DE2000/003076 patent/WO2001020632A1/de active IP Right Grant
  • 2000-09-06 DE DE50003215T patent/DE50003215D1/de not_active Expired - Fee Related
  • 2000-09-06 CN CNB008123780A patent/CN1214427C/zh not_active Expired - Fee Related

Patent Citations (2)

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