Displacement sensor
AssigneesShinko Electric Co., Ltd., Nabtesco Corporation
InventorsYasushi Nakano, Hiroshi Akase, Daiju Kaneshiro
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Abstract
A displacement sensor includes a primary coil (2), secondary coils (4a, 4b), and a movable magnetic core (6) movable with displacement of an object to be measured to cause voltages generated in the secondary coils (4a, 4b) to vary. The secondary coils (4a, 4b) are differentially interconnected. A polyphase signal generating unit (10) generates two-phase component signals having different phases, from a differentially combined output voltage of the secondary coils (4a, 4b). Full-wave rectifying units (16, 18) rectify the polyphase component signals, the rectified polyphase component signals are combined in a combiner (22), and the combiner output is applied to a low-pass filter (24).
Claims4
A displacement sensor comprising a coil and a movable magnetic core movable with displacement of an object to be measured, an output signal of said displacement sensor varying with the movement of said movable magnetic core;
- said displacement sensor further comprising:
- polyphase signal generating means for forming a plurality of polyphase component signals having different phases from said output signal;
- a plurality of rectifying means for rectifying respective ones of said polyphase component signals;
- and
- combining means for combining rectification outputs of said rectifying means.
Dependencies are inferred from the claim text.