Linear-output, temperature-stable rotational sensor including magnetic field responsive device disposed within a cavity of a flux concentrator

摘要

A non-contacting type sensor and method for sensing angular position are provided for sensing the angular position of a body such as a throttle valve. The sensor includes a stator assembly and a rotor assembly adapted to be coupled to the body for rotation relative to the stator assembly. The rotor assembly includes a closed-loop magnetic flux concentrator which defines a controlled electromagnetic cavity and generating means for generating a first magnetic field within the cavity. The stator assembly includes a semiconductor device disposed within the cavity and having an electrical property which is a function of the orientation and strength of a resultant magnetic field. The stator assembly further includes a coil wound about the device for producing a second magnetic field which substantially cancels the effects of the first magnetic field on the device so as to obtain the resultant magnetic field. The electrical current in the coil required to produce the second magnetic field provides an indication of the angular position of the body.