Electricity: magnetically operated switches – magnets – and electr – Magnets and electromagnets – With magneto-mechanical motive device
Patent
1999-05-28
2000-10-10
Scott, J. R.
Electricity: magnetically operated switches, magnets, and electr
Magnets and electromagnets
With magneto-mechanical motive device
218154, 335 79, 335234, H01H 300, H01H 5127, H01F 7124
Patent
active
061305944
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a switch with a magnetic drive having an armature which can be displaced between two end positions and is connected with a least one movable switch contact, and which in the end positions is under the influence of magnetically generated forces.
2. Description of Related Art
Here, switch is understood to be a device which switches on nominal currents or excess currents under certain conditions, resists the nominal or excess currents and interrupts them, as well as insulates electrical circuits from each other. To this end a switch has two stable states (states of rest requiring holding forces). In the open state the switch is capable of maintaining the electrical insulation of the circuits. In the closed state the switch is capable of resisting the defined nominal current permanently and an excess current for a defined amount of time.
The switch furthermore has two transition stages in which energy is supplied to a movable switching element. The transition into the closed state is intended to close a circuit and turn on a current. The transition into the open state is intended to interrupt a current. The main components of such a switch are: connecting terminals, switch chamber, quiescent current or operating current contacts, a drive mechanism for actuating the movable switching contacts, and a housing in which the above described elements are arranged and which insulates the circuits. Switches of this type are also known by the name power circuit breakers.
An electrical switch of the type described at the outset is known (DE 43 04 921 C1). The armature of this switch is made of laminated soft iron sheets and is axially displaceably arranged in a chamber surrounded by a rectangular yoke made of laminated soft iron sheets between two permanent magnets, whose like poles face the armature. The permanent magnets are respectively stationarily attached between the armature and a pole piece which makes a transition into the yoke. A coil is respectively arranged inside the yoke on both sides of the pole pieces.
BRIEF SUMMARY OF THE INVENTION
The present invention has as an object to provide a switch with a magnetic drive wherein magnetically generated forces maintain the armature and the movable elements connected with it stably in the respective end position, and wherein an armature movement, once it has been started, dependably changes the armature and the elements connected with it from the one stable end state into the other.
In connection with a switch of the type described at this outset, the object is attained in that the armature and a ferro-magnetic bypass element are arranged linearly movable one behind the other in a space between a first and a second detent, that the detents are pole faces of magnetic circuits containing at least one permanent magnet which exerts a force on the armature, which is displaceable by the force of an electromagnet in the direction toward the first detent, which maintains the armature in the first stable end position against the first detent when the bypass element is arranged in its end position against the second detent, and that by means of the placement of the bypass element against the armature, the force exerted by the permanent magnet on the armature is transferred, possibly by means of a force exerted from the outside on the armature, is reversed in its direction and transferred to the bypass element, because of which the bypass element is displaced as far as the second detent and the armature as far as its second stable end position and maintained therein.
With this drive, the armature has only two stable positions, in one of which it rests against the first detent and in the other against the bypass element, which in turn rests against the second detent in the second stable end position of the armature. In this way having the armature driving the movable contact becoming hung up in an intermediate position between the two end positions is preventable. Once the switching of the
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Bonjean Marc
Morant Michael
Wysota Denis
E.I.B. S.A.
Scott J. R.
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