Electricity: motive power systems – Linear-movement motors
Patent
1978-09-14
1980-09-02
Duggan, Donovan F.
Electricity: motive power systems
Linear-movement motors
310 12, 310 14, 104290, H02K 4102
Patent
active
042208998
ABSTRACT:
The linear motor comprises a stator and an armature mounted for travel along the length of the stator. The stator includes an elongated inner flux-carrying structure extending in the direction of armature travel. A plurality of stationary coils are provided on the inner flux-carrying structure, the stationary coils being spaced in the direction of armature travel. The armature is provided with a plurality of radially magnetized permanent magnet units spaced in the direction of armature travel. The magnetic polarity of successive ones of the permanent magnet units alternates, proceeding in the direction of armature travel from one permanent magnet unit to the next. An outer flux-carrying structure, provided on either the stator or armature, extends in the direction of armature travel and surrounds the armature. Because the polarity of successive permanent magnet units alternates, proceeding from one to the next, the flux passing through the inner and outer flux-carrying structures is not, at any point, equal to the sum of the fluxes from all the permanent magnets, and accordingly the flux-carrying structures can be of smaller flux-conducting cross-sectional areas, and therefore of lower weight.
REFERENCES:
patent: 1020942 (1912-03-01), Bachelet
patent: 1020943 (1912-03-01), Bachelet
patent: 2112264 (1938-03-01), Bowles et al.
patent: 3575650 (1971-04-01), Fengler
patent: 3594622 (1971-07-01), Inagaki
patent: 3706922 (1972-12-01), Inagaki
patent: 3707924 (1973-01-01), Barthalon et al.
patent: 3884154 (1975-05-01), Marten
patent: 4151447 (1979-04-01), von der Heide et al.
Duggan Donovan F.
Papst-Motoren KG
Striker Michael J.
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