Servo control via magnetic compensator and contactor comprising such a compensator
A compensating device and magnetic technology, which is applied in the direction of emergency protection devices, contacts, relays, etc., can solve the problems of destroying the overall size and increasing the power consumption of contactors, etc.
Inactive Publication Date: 2014-12-17
SCHNEIDER ELECTRIC IND SAS
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Problems solved by technology
To counteract this effect, the contactor holding current would have to be increased, but this would destroy the overall size as well as increase the power consumption of the contactor
Method used
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[0016] figure 1 The opening and closing mechanism of the single pole contactor 10 is schematically shown. The two conductors 12 each support a stationary contact 14 which cooperates with a movable contact 16 to operate between open and closed positions. The two movable contacts 16 are fixed to each other by means of bridges and are actuated by electromagnetic means 20 comprising a coil 22 connected to a contact fixedly attached to the support 18 of the movable contacts 16 . The holder means 24 are associated. A pole spring 26 housed inside the contact holder 24 generates a force between the contacts 14, 16 to keep the contacts closed, which determines the contact pressure F P .
[0017] The contact holder 24 further supports a magnetic compensator 30 comprising a first magnetic part 32 and a second U-shaped magnetic part 34 fixed on the contact bridge 18 by coupling or by simple pressing. The two parts are arranged such that a through opening is formed in which the contact...
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#CMT# # / CMT# The device i.e. magnetic compensator (30), has a magnetic piece (32) functionally coupled to a contact bridge (18) of a movable contact (16). A measuring unit (40) measures a magnitude representative of current flowing between the movable contact and a fixed contact (14). A processing unit (42) processes the magnitude representative of the current for comparison to a threshold. A control unit (44) controls supply units of a coil (22) according to the result of the processing unit to increase the current supplied to the coil when the current flowing between the contacts exceeds the threshold. #CMT# : # / CMT# An independent claim is also included for an electrical apparatus including a supply unit provided with an interrupter for disconnecting one of windings. #CMT#USE : # / CMT# Device i.e. magnetic compensator, for magnetic compensation of electrodynamic repulsion forces of movable and fixed contacts in an electrical apparatus such as contactor (all claimed) e.g. large-caliber unipolar contactor and high-range unipolar contactor. #CMT#ADVANTAGE : # / CMT# The control unit controls supply units of the coil according to the result of the processing unit, so as to increase the current supplied to the coil when the current flowing between the contacts exceeds the threshold, so that the efforts of the actuator are increased to oppose the repulsion forces at the contacts, thus maintaining the current in the coil at minimum during normal operation of the contactor, and hence reducing the risks of openings by early overload without increasing the inertia due to the magnetic compensation device. The magnetic compensation device has reduced size, and reduces electric power consumption of the contactor. #CMT#DESCRIPTION OF DRAWINGS : # / CMT# The drawing shows a perspective view of a magnetic compensator in usage position. 14 : Fixed contact 16 : Movable contact 18 : Contact bridge 22 : Coil 30 : Magnetic compensator 32 : Magnetic piece 40 : Measuring unit 42 : Processing unit 44 : Control unit.
Description
technical field [0001] The present invention relates to the field of contactor protection, in particular that of cooperating devices to compensate for electrodynamic repulsion forces that tend to wear the obstructive disconnection of the contacts, or even weld them together. The invention concerns the optimization of such compensating means in order to keep the overall size and power consumption of the contactors as low as possible, while enabling them to perform their function correctly in the event of an overload due to a short circuit. Background technique [0002] In the contactor, in order to ensure the current flow, a balance is established between the mechanism acting as a spring to ensure the pressure between the contacts and the repulsive force generated at the level of the contacts by the current flow. Contactors are typically designed to withstand approximately several times their rated current, eg 12 times the rms currents, depending on load control. Beyond this...
Claims
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IPC IPC(8): H01H1/54H01H81/04
CPCH01H77/101H01H1/50H01H47/002H01H47/04H01H47/22H01H71/24
Inventor 克里斯琴·D·巴塔伊米歇尔·劳雷尔
Owner SCHNEIDER ELECTRIC IND SAS