Pitch-compensated induced current position transducer

Details Pitch-compensated induced current position transducer Pitch-compensated induced current position transducer

1997-08-25

1999-12-07

Strecker, Gerard

Electricity: measuring and testing

Magnetic

Displacement

32420717, 32420724, 336 45, 34087032, G01B 702, G01B 714, G01D 520

Patent

active

059989904

ABSTRACT:
A pitch-compensated induced current position transducer includes a scale having a plurality of scale elements arranged along a measuring axis and a read head positioned adjacent to and movable relative to the scale. The read head has a transmitter winding that generates a changing magnetic field and at least one receiver winding. One of the transmitter winding and receiver winding is formed from a spatially modulated section having an associated phase. The spatially modulated section has flux coupling areas distributed relative to a plurality of polarity zones. The spatially modulated section has at least one pitch balancing section. In one type of pitch balancing section the positive polarity winding loops and the negative polarity winding loops have their centroid axes aligned. The total flux coupling area in at least one polarity zone may optionally be different than the total flux coupling area in an adjacent polarity zone while the total negative flux coupling area remains equal to the total positive flux coupling area. In general, the pitch balancing sections are configured so that the overall centroids of all spatially modulated sections are aligned along the measuring axis. The distribution of the flux coupling area may be symmetrical.

REFERENCES:
patent: 4959615 (1990-09-01), Andermo
patent: 5804963 (1998-09-01), Meyer
patent: 5841274 (1998-11-01), Masreliez et al.

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