Flat linear motor

Details Flat linear motor Flat linear motor

1994-11-30

1998-03-03

Dougherty, Thomas M.

Electrical generator or motor structure

Dynamoelectric

Linear

H02K 4100

Patent

active

057239177

ABSTRACT:
A flat linear motor has a single row of permanent magnets mounted upon backplate and an armature having non-overlapping flat coils encapsulated in a block of epoxy resin mounted upon an armature backplate comprised of a magnetic material and having anchoring recesses or protrusions. The armature backplate serves to provide magnetic circuits of low magnetic resistance in the flat linear motor thereby increasing a force generated by the linear motor. A length of the armature backplate is a non-integral number of a pitch length of the permanent magnets so as to reduce cogging. The three non-overlapping flat coils are comprised of square wire windings which provide increased thermal conduction. An embodiment of the invention employs software commutation wherein a position sensing device is used by a controller to determine a position of the armature from which a field polarity is found by means of a formula or a look-up table. Further embodiments of the invention have a cooling manifold, magnetic flux focusing armature backplates, and a modified Halbach magnet array.

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patent: 5309049 (1994-05-01), Kawada et al.
patent: 5402021 (1995-03-01), Johnson

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