ABSOLUTE POSITION SENSOR USING MULTIPLE WAVELENGTHS OF OFFSET PITCH PHASE PATTERNS

摘要

in order to enable a resolver (120) for detecting absolute positions in a large displacement, while obtaining the resolution, accuracy and precision that can be obtained by an incremental mode of operation, the resolver is provided with a plurality of terminals (o1,. o2, o2), providing information (c1, c2) to three phases as a function of position.a microcomputer (170) is programmed to perform a decoding process (160) for reading the information on the three phases to and derived from the absolute position. this method can be applied to the detection of linear positions in the detection of rotary positions.by multiplexing, digital signal processing and integration of large scale circuit (170) for interfacing the resolver (120), and a micro computer (170) can be obtained with this method in detection of absolute positions in high reliability and co cost reduced.the information on the three phases are not readily provided by an inductive coupling among a plurality of coils (123, 124, 125, 126, 127), including a set of coils to be shifted (124, 125, 126, 127) connected to the terminals.the phase detector signal is picked up by means of a sensor for mobile (50, 51, 52) and a stationary coil (123) connected by a ferromagnetic core (121). a modulator (409) is used to transmit radiophoniquement. powered by the signal from the phase detector sensor cell.the windings are formed by photolithography on a not out of a plurality of laminated layers (w1, w4), or by winding coils in the proper alignment, for example, a mold winding layers (530) and not many.