Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1994-07-15
1996-08-13
Budd, Mark O.
Electrical generator or motor structure
Dynamoelectric
Linear
310112, 310166, 310177, 310254, H02K 4100
Patent
active
055459366
ABSTRACT:
An electrical machine of the reluctance or permanent magnet type includes one or more pawns of high permeance material which are relatively moveable along a plurality of C-shaped stators which are regularly spaced at a predetermined stator pitch dimension. The pawn or pawns are of a length equal to or exceeding the stator pitch dimension such that as the pawn is pulled into the air gap of a stator which is energized, the magnetic field induced in the pawn or provided by a permanent magnet is coupled to a following stator which is not yet energized to avoid reverse acceleration of the pawn and reduce vibration. The field coupled to the following stator also reduces the power required to establish a desired level of magnetic flux in the following stator when the following stator is energized. The cross-section of the air gap of the stator and the pawn are closely matched to maintain a minimum air gap when the pawn passes through the air gap of each stator. The pawns are bilaterally symmetrical and mounted on the edge of a rotor disk to obtain high dimensional stability over a range of rotational speeds. The cross-sectional shape of the pawn and air gap of the stator preferably establish an area of the air gap which exceeds the cross-sectional area of the magnetic flux path through the pawn.
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