Method for controlling velocity of an armature of an electromagn

Details Method for controlling velocity of an armature of an electromagn Method for controlling velocity of an armature of an electromagn

1998-07-24

1999-11-23

Paladini, Albert W.

Electricity: electrical systems and devices

Control circuits for electromagnetic devices

For relays or solenoids

361167, H01H 4728

Patent

active

059911433

ABSTRACT:
A method of controlling velocity of an armature of an electromagnetic actuator as the armature moves from a first position towards a second position is provided. The electromagnetic actuator includes a coil and a core at the second position. The coil generates a magnetic force to cause the armature to move towards and land at the core. Spring structure acts on the armature to bias the armature away from the second position to a resetting position. The method includes selectively energizing the coil to permit the armature to move at a certain velocity towards the core. A certain voltage corresponding to a voltage across the coil is determined when the armature is approaching the core. The certain voltage corresponds to a rate of change of magnetic flux and is used as a feedback variable to control energy to the coil so as to control a velocity of the armature as the armature moves towards the core. In one embodiment, the certain voltage is a measured terminal voltage of the coil. In another embodiment, the certain voltage is a parametrically determined voltage which mirrors the terminal voltage.

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