MEEN 225 Lecture Notes - Lecture 8: Ferromagnetism, Diamagnetism, Magnetism

• School: Texas A&M University
• Department: Mechanical Engineering
• Course: MEEN 225
• Professor: John Steven Haglund

Document Summary

Energy losses in ferromagnetic core: hysteresis loss is an energy loss in ferromagnetic core during magnetizing and demagnetizing process where the energy is dissipated as heat. Assume that flux in the core to be initially zero. When an alternating current is applied to the ferromagnetic core, the current increases for the first time and the flux traces path ab. When current falls, the flux traces out a different path from the one it followed when the current increased. And later when the current increases again, the flux traces out path deb. Ferromagnetic materials are divided into two groups o soft magnetic materials: have a steeply rising magnetization curve , relatively small and narrow hysteresis loop. When changing magnetic flux passes through the core, voltage will be induced within the core causing current to flow within the core. This current causes resistive losses in the iron core, dissipated as heat.