An Experimental and Theoretical Study of Eddy-Current Couplings and Brakes

The steady-state theory of eddy-current couplings with homogeneous ferromagnetic drums is derived and shown to be valid by tests on an experimental coupling. The effect of machine parameters on peak-torque conditions and a normalized torque-speed relation are given. The flux-density distribution across the pole face under load was measured and correlated with measured torque and speed. Measurements of drum current-density and flux-density distribution through the drum thickness are also given.