H - Electricity – 01 – F
Patent
H - Electricity
01
F
H01F 7/08 (2006.01) H01F 7/13 (2006.01) H01F 7/16 (2006.01) H02K 33/18 (2006.01)
Patent
CA 2059530
2059530 9101622 PCTABS00003 An electromagnet (400) defines a gap between a first polepiece (410) in the shape of the butt end of an elongate cylinder and a second polepiece (420) in the shape of a thick annular ring. A permanent magnet (440) having its poles aligned along the axis of the cylinder moves bidirectionally in the gap in response to alternate polarity energization of the electromagnet (400), serving as a prime mover. When the electromagnet (400) is not energized then the magnetic flux of the permanent magnet shunts an adjacent polepiece (400 or 420, as in the case may be), holding the magnet in place. Upon energization of the electromagnet the relatively strong magnetic flux of the permanent magnet (440) is switched by a relatively weak electromagnetic flux to pass through the electromagnet (400), exerting an electromotive force on the permanent magnet (440) and causing it to move. Typically a one-half gram samarium cobalt permanent magnet moves 0.38 mm in response to a 0.015 ampere 1.5 v.d.c. 20 millisecond current pulse (4.5 x 10-4 joules) and holds at 40± 2g's. dislodging acceleration at each of two stable positions where no power is consumed.
Kirby Eades Gale Baker
Solatrol Inc.
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