Patent ID: 6776057
Filing Date: 2004-08-17
Classification: G01L

Abstract:
A transducer for a torque or force transducer comprisinga member having a region of magnetisable material to be subject to an applied stress due to torque or force said region including first and second zones that are annular about an axis with said second zone located radially inward of said first zone, one of said zone having a permanent magnetisation that is longitudinally oriented in the direction of said axis and the other zone providing a return flux path for flux generated by said one zone, said one zone generating a magnetic field exteriorly of said region which has a magnetic field component in a circumferential direction with respect to said axis that is a function of the applied stress and said other zone having a permanent magnetisation that is longitudinally oriented in the direction of said axis and that is of opposite polarity to the longitudinally magnetisation of said one zone.