H - Electricity – 02 – K
Patent
H - Electricity
02
K
318/20, 310/54
H02K 37/00 (2006.01) H02K 37/10 (2006.01) H02K 41/03 (2006.01) H02P 8/00 (2006.01) H02P 8/14 (2006.01)
Patent
CA 1235173
ABSTRACT A stepping motor of the hybrid multi-phase type is disclosed which comprises a primary element such as a stator which has one winding per phase, a secondary element which can be displaced with respect to the primary element and a permanent magnet. The pole faces of the magnet are equipped with two pole pieces the ends of which define gaps with the rest of the magnetic circuit in such a manner that for certain relative positions of the primary and secondary elements a closed magnetic circuit is achieved which comprises the permanent magnet and two closed gaps. The motor comprises, per phase, a second permanent magnet which is also equipped on its pole faces with two pole pieces the ends of which define gaps with the ends of the pole pieces of the first permanent magnet in such a manner that one permanent magnet is in the primary element and another in the secondary element. Each gap is thus flanked by two permanent magnets, one of which is mobile and the other one fixed, one upstream of the flux circulation and the other one downstream. In this motor also, this second permanent magnet is oriented in such a manner that the field of the winding of the corresponding phase is perpen- dicular to the direction of its magnetization and directed towards one or the other of the ends of each of its pole pieces defining the gaps, so as to create a flux switching device.
467108
Fetherstonhaugh & Co.
Telemecanique Electrique (la)
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