A shaft angular position sensor having a DC output voltage has a magnetic housing into which are mounted a Hall effect device, a bobbin-winding assembly and a rotor. The bobbin-winding assembly is a hollow cylindrical coil form made of non-magnetic material about which are wound two excitation coils...http://www.google.es/patents/US6288535?utm_source=gb-gplus-sharePatente US6288535 - Hall effect, shaft angular position sensor with asymmetrical rotor
Hall effect, shaft angular position sensor with asymmetrical rotor
