A new torque transducer with permanent magnets and a ring core

A new torque transducer of non-contact type with permanent magnets and a ring core is presented. If a torque is applied to the shaft, the twist deflection is transformed to a magnetic field of the circumferential direction in the tape wound core. The torque is measured by detecting this magnetic field through the ac bias applied to the core. With this new transducer the shaft torque can be measured not only in the rotating state but also in the stationary state.