Electromagnetic relay

Abstract

An electromagnetic relay includes a fixed contact, a moving contact, an electromagnet device, and a second coil. The moving contact moves from a closed position where the moving contact is in contact with the fixed contact to an open position where the moving contact is out of contact with the fixed contact, and vice versa. The electromagnet device includes a first coil and a mover. The mover is actuated on receiving a magnetic flux generated when a current flows through the first coil to move the moving contact from one of the closed position or the open position to the other position. The second coil gives, when a current flows through the second coil, at least a magnetic flux, of which a direction is opposite from a direction of the magnetic flux generated by the first coil, to the mover.

1 . An electromagnetic relay comprising:
 a fixed contact;   a moving contact configured to move from a closed position where the moving contact is in contact with the fixed contact to an open position where the moving contact is out of contact with the fixed contact, and vice versa;   an electromagnet device including
 a first coil and 
 a mover configured to be actuated on receiving a magnetic flux generated when a current flows through the first coil to move the moving contact from one of the closed position or the open position to the other position; and 
   a second coil configured to give, when a current flows through the second coil, at least a magnetic flux, of which a direction is opposite from a direction of the magnetic flux generated by the first coil, to the mover.   
     
     
         2 . The electromagnetic relay of  claim 1 , further comprising a demagnetization circuit configured to supply an alternating current to the second coil. 
     
     
         3 . The electromagnetic relay of  claim 2 , wherein
 the demagnetization circuit includes a capacitor that forms a resonant circuit with the second coil.   
     
     
         4 . The electromagnetic relay of  claim 2 , wherein
 the demagnetization circuit includes:   a switch configured to open and close an electrical path connecting the second coil to an AC power supply; and   a control circuit configured to control ON/OFF states of the switch.   
     
     
         5 . The electromagnetic relay of  claim 4 , wherein
 the control circuit is configured to turn the switch ON when supply of a current to the first coil is suspended.   
     
     
         6 . The electromagnetic relay of  claim 1 , further comprising a yoke configured to allow a magnetic flux generated by the first coil to pass therethrough, wherein
 the second coil is separated from the first coil by the yoke.   
     
     
         7 . The electromagnetic relay of  claim 1 , wherein
 the second coil is provided separately from the first coil.