Energy saving using permanent magnets on the electric machines

Abstract

The paper deals with the energy balance of permanent magnets in their circuit of use, when its permeance varies. The focus is on the dynamic-permanent circuit, in which the magnet is magnetized in the circuit. Its main features are defined and described operation using the demagnetization curve, the load line and the return curve. It is demonstrated that performing mechanical work in a cyclical evolution is possible only by external energy input. The different types of permanent magnets are presented and described to be used at high temperature. Electric motors that use permanent magnets instead of electric excitation lead to significant energy savings.