Resolver unit for use as sensor for measuring angular displacement of rotary motor, has rotors whose poles are arranged on each other in equal distance, where number of poles of one of rotors is different from number of poles of other rotor

摘要

The resolver unit (10) has two resolvers (20, 30) i.e. reluctance resolvers, comprising two rotors (22, 32), where one of the rotors is coaxial to the other rotor. Magnetic poles (24, 34) of the rotors are annularly arranged on each other in an equal distance. Number of magnetic poles of the latter rotor is different from number of magnetic poles of the former rotor. The resolvers are coaxially arranged on each other at a shaft of a rotary motor in a certain distance in order to measure angular displacement of the rotary motor and to output a signal of amplitude modulation.