Position sensors for linear motors including plural symmetrical

Details Position sensors for linear motors including plural symmetrical Position sensors for linear motors including plural symmetrical

1993-10-01

1995-07-18

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Displacement

32420724, 336 45, G01B 7287

Patent

active

054345049

ABSTRACT:
Position sensors for detecting the position of a linear motor relative to a platen are disclosed. In one embodiment, the sensor includes first and second magnetic members having teeth disposed relative to the teeth on the platen. A single turn planar drive winding is disposed around at least one of the teeth of the first and second magnetic members for producing a first and a second drive flux within each of the magnetic members. A single turn planar sense winding is disposed around at least one of the teeth of the first and second magnetic members for generating first and second outputs which are a periodic function of the position of the sensor relative to the platen. In another embodiment of the present invention, the sensor includes two magnetic members each having four pole pieces. A drive winding is disposed on each member for establishing first and second fluxes in each member which are symmetrical about a center of each member. A sense winding is wound around the center two poles of each member for measuring the relative flux therein and producing art output which is a periodic function of the position of the sensor relative to the platen.

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