The RotafenteTM copper-graphite commutation system -- For applications requiring high continuous and peak torques, where high current densities have to be commutated and power stages such as choppers are used, Portescap D.C. motors with the Rotafente® commutation system provide the optimal solution.
The stator -- The stator part consists of a cylindrical two-pole permanent magnet, placed inside a steel tube closing the magnetic circuit. High quality rare earth or AlNiCo magnets ensure very high performance in a small envelope. The rotor -- The active rotor part simply consists of a cylindrical skew winding, requiring no iron core. As a result, rotor inertia is very low. Unlike other D.C. motor technologies, due to the absence of iron there is no cogging and the rotor will stop in any position. There are also no iron losses, and the running speed depends only on the supply voltage and load torque.
Low Winding -- The low winding inductance and constant improvements of the quality of the brushgear materials, combined with a system for Reduction of the Electro-Erosion (the REE® system which is covered by a patent), all result in a reduction of the electrical wear by a theoretical 75%. Thus lifetime is significantly increased.
For more information, contact M Rutty & Co.Phone: (02) 9457 2222 Email: [email protected]