Electricity: measuring and testing – Magnetic – Displacement
Patent
1989-12-20
1991-03-26
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420724, 32420725, G01B 714, G01R 3300
Patent
active
050032607
ABSTRACT:
For enabling a resolver (120) to have absolute position sensing over a wide displacement range while still obtaining the resolution, accuracy and precision obtainable by operation in an incremental mode, the resolver is provided with a number of terminals (.phi..sub.1, .phi..sub.1, .phi..sub.2, .phi..sub.2) for providing offset pitch phase indications (C.sub.1, C.sub.2) as a function of position. A microcomputer (171) is programmed to execute a decoding procedure (160) for reading the offset pitch phase indications and from them computing the absolute position. This method is applicable to linear as well as rotary position sensing. By using multiplexing, digital signal processing and large-scale circuit integration (170) for interfacing the resolver (120) to the microcomputer (171), the method can achieve absolute position sensing with high reliability and low cost. The offset pitch phase indications are readily provided by inductive coupling between a multiplicity of windings (123, 124, 125, 126, 127), including a set of offset pitch windings (124, 125, 126, 127) connected to the terminals. A phase indicating signal is picked up using either a relatively moving pick-up device (50, 51, 52) or a stationary coil (123) linked by a ferromagnetic core (121). A radio-frequency powered modulator (409) is provided for wireless transmission of the phase indicating signal from the moving pick-up device. The offset pitch windings are formed by photolithography on a plurality of laminations or layers (W.sub.1 -W.sub.4), or by winding coils in proper registration, for example, on a multi-layer, multi-pitch coil form (530).
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Auchterlonie Richard C.
Snow Walter E.
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