| 摘要 |
<p>An inductive position sensor has a spatially periodic scale (20) with a series of conducting or permeable features (22) of pitch T and a reading head with drive windings (202, 204) and sense windings (201, 203), facing the scale with a spatial period 2T along the scale. The windings (201-204) are each divided in two identical winding elements (201A-204A, 201B-204B), having the same relative location within two identical winding element patterns (A, B) having a center to center distance along the scale of NT+T/2, N being an integer, and connected so that the winding element polarities in each winding are either opposed for drive windings and equal for sense windings or equal for drive windings and opposed for sense windings. Thereby, direct couplings in both patterns cancel each other out, while the spatially periodic signals coupled via the scale reinforce each other.</p> |
