Electrical generator or motor structure – Dynamoelectric – Linear
Patent
1996-06-24
2000-10-24
Ramirez, Nestor
Electrical generator or motor structure
Dynamoelectric
Linear
310 905, 310156, 310266, 310 15, H02K 3312, F16C 3906
Patent
active
061371955
ABSTRACT:
An actuator, with two independent degrees of freedom, rotates a stage about an axis and moves the stage along the axis, the range of motion defining a cylinder or cylindrical section. The stage is mounted on a hollow cylindrical plunger fitting in an annular well. A bearing allows the plunger to move axially and rotationally, in the preferred embodiment the bearing is an air bearing. The plunger has an array of permanent magnets on its external cylindrical face opposite coils in the well. Equal numbers of oppositely-polarized permanent magnets are arranged in a regular cylindrical pattern at 50% packing density forming rings and columns of like-polarity magnets, the rings of one polarity alternating with rings of opposite polarity and the columns of one polarity alternating with columns of opposite polarity. A set of Z-axis coils (for axial movement) curve around the plunger and are shaped to allow a current in them to produce an axial force with respect to the rings of magnets. A set of .phi.-axis coils (for rotational movement) have longitudinal axes that are parallel to the axis of the plunger and are sized to allow current in them to impel the columns of magnets. Part of the external surface of the plunger has a grid scale, which is encoded by Z-axis and .phi.-axis optical pickups to provide position information to a controller.
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Anorad Corporation
Horn John J.
Miller John M.
Mullins Burt
Ramirez Nestor
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