Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1996-06-24
2000-05-30
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Linear
H02K 4100
Patent
active
060694165
ABSTRACT:
An X-Y traversing machine employs optical pickups on a stage that moves around a base on an air bearing. A pattern of dots on the surface of the base forms a scale. Respective X- and Y-direction optical pickups are used to detect incremental movement in X- and Y-directions independently. Each pickup averages the reflected light from an elongated rectilinear region whose long axis is aligned perpendicular to the direction of movement the pickup detects. The dots are formed on an encoder scale element. According to an embodiment of the invention, forces are developed without using serrations in the stage and magnets so that a substantial spacing between the coils and field generator (permanent magnets in the preferred embodiment) can be tolerated. This allows the encoder scale to be placed on or protected by a sheet between the platen and the stage. [For example, the pattern may be printed on a flexible transparent Mylar sheet that can be readily replaced if damaged. To form a complete motor platen, according to one embodiment of the motor platen, the outer surface of the grid scale element is laid over an element with a precise flat surface is provided with some means for pulling the grid scale flat to the flat surface. Magnets are arranged on the back of the scale element and epoxy applied around and between the magnets. A base plate is placed over the epoxy and held in place till the epoxy cures.]
REFERENCES:
patent: 4210448 (1980-07-01), Forgo
patent: 5334892 (1994-08-01), Chitayat
patent: 5371598 (1994-12-01), Ghaem et al.
patent: 5521831 (1996-05-01), May
patent: 5552651 (1996-09-01), Radomski
Amin Himanshu S.
Anorad Corporation
Gerasimow A.M.
Horn John J.
Jones Judson H.
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