Patent ID: 7113385
Filing Date: 2006-09-26
Classification: H01F,H02K

Abstract:
1. A method of controlling a magnetic flux of an electromagnet with a relay pulling characteristic, characterized by at least two stabile levels of values of a magnetic flux in a magnetic guide, with a supply of controlling pulses of electric current into a winding of a magnetizing coil with obtaining a pulling force of a moving part of a magnetic guide of the electromagnet at least with one air gap, the method comprising the steps of forming the magnetic guide at least partially of a magnetically hard material which a property to maintain at least two stabile conditions of magnetization; using as the controlling pulses two short-term pulses having an opposite polarity and supplied into the magnetizing coil on the magnetic guide of the electromagnet, with a supply of a first pulse providing a closing of a magnetic circuit and minimization of magnetic resistance of the magnetic guide due to minimization of the air gap of the magnetic guide with subsequent maximization of the magnetic flux and the magnetic guide with its transfer to one of the stabile conditions characterized by a maximum value of an magnetic flux in the magnetic: guide which corresponds to an energy of the controlling pulse action, with a possibility of maintaining the magnetic guide of the electromagnet in this stabile condition, and providing its holding or attracting force until a supply of a second controlling pulse of electric current of the opposite polarity whose energy characteristic has a value sufficient for transferring the magnetic guide into a second stabile condition which is characterized by a different value of the magnetic flux and a different value of the holding or attracting force.