the working principle of the eddy current dynamometer:

Eddy current dynamometer is mainly composed of rotating parts (induction plate), shell (armature and field part). When the excitation coil and coaxial rotor assembly when direct current (dc), the resulting magnetic menstruation armature, eddy current ring, air gap and the rotor to form a closed loop. Rotor due to the cylindrical surface is made into a uniform distribution of tooth and slot, in the air gap and armature body or eddy current ring surface density and magnetic field, as a result, the rotor being dragged rotates, the armature and eddy current ring any point on the surface of the magnetic field produced is called variable changes, the induction "vortexing", due to the effect of coupling of the eddy current and magnetic field, the braking torque on the rotor, because the armature body is through base are fixed on the floor, so the rotor unable to drive the armature rotating body, the power is converted into mechanical power output armature and eddy current ring "vortexing" to produce the equivalent of heat, the heat by the eddy current ring into the armature and continuous cooling water in cooling water tank and eddy current loader's own consumption.

Corresponding to each constant current excitation coil, eddy current dynamometer are showing a attached to the stability of the speed brake torque characteristic curve, change the size of the excitation current, can change the braking torque.

the eddy current dynamometer main technical indicators