Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1996-09-04
1998-11-03
Leja, Ronald W.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
H01H 4700
Patent
active
058318097
ABSTRACT:
A method is provided for controlling an electromagnetic actuator having an electromagnet including a magnetic core presenting a pole face and an electromagnet coil wound around the magnetic core, a return spring and an armature connected to an actuation mechanism and movable toward the pole face by a magnetic force of the electromagnet against the force of the return spring. The method includes: detecting a time behavior and/or value of current and/or voltage present at the electromagnet coil during a time period when the armature does not move relative to the electromagnet, and deriving a value corresponding to the actual ohmic resistance and/or inductance of the electromagnet coil from the detected time behavior and/or value from the detecting step for compensating changes in the ohmic resistance of the electromagnet coil.
REFERENCES:
patent: 5131624 (1992-07-01), Kreuter et al.
patent: 5442515 (1995-08-01), Wallaert
Schmitz Guenter
Schrey Ekkehard
FEV Motorentechnik GmbH & Co. KG
Leja Ronald W.
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