Magnetic torsion meter for measuring torques

摘要

In a magnetic torsion meter for measuring the torque exerted on a rotating assembly, the rotating assembly includes first and second sections of a rotating shaft brought together by a torsion shaft. The torsion meter includes an exterior U-shaped fixed magnetic circuit. A continuous source of magnetic excitation creates a flux through the circuit and gaps of the first and second rotors. The first and second rotors each include an annular disk made of a non-magnetic material. The disks each include two concentric coils of ferromagnetic pins. The pins of the first rotor face the pins of the second rotor while defining two measuring gaps. The relative angular position of pins on both sides of the measuring gap is such that the reluctances are equal when no torque is applied but vary inversely when a nonzero torque is applied. The torsion meter includes at least two magnetic induction sensors housed in one of the smooth gaps of the U-shaped magnetic circuit. The sensors measure magnetic flux and output results to a treatment circuit, which produces a signal proportional to the angle of torsion.