Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1998-02-23
2000-11-28
Fleming, Fritz
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
361143, 361147, H01H 4700
Patent
active
061543535
ABSTRACT:
A suspension system for magnetically suspending an object O comprises an electromagnetic coil L having an axially extending core 13 of magnetically permeable material and a permanent magnet 14 disposed on its axis. A permanent magnet 10 is also provided in the object O and is arranged such that it is in attraction with the permanent magnet 14 on the coil L, and with the magnetically permeable core 13 so that the object O is suspended at a position below the coil L by the attractive force. Sensors 15,16 on the coil L detect the magnetic field of the permanent magnet 10 in the object O, and provide signals to a control circuit, which applies current to the coil L to attract the object O when the detected field is below a predetermined limit and to repel the object when the detector field is above a predetermined limit. In this manner, the object O is held in position using a relatively low current, since the coil L is only energised when the object moves away from the position in which it is held by the field of the permanent magnets 10,14.
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Bowers Edward Norman
Jones Ronald Barry Thomas
Shirazee Nabeel
Fleming Fritz
Magnetic Patent Holdings Limited
Schindler Edwin D.
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