Electrical Machines

This is a living, web-native edition of a classic course in Electrical Machines. Each of the 92 chapters lives on its own page — readable on any device, searchable, and free to share. The journey starts with the question of how a magnetic field stores energy, and ends with the solid-state-fed special machines that drive a modern electric vehicle.

The sequence follows the standard electrical engineering curriculum, building from magnetic circuits and Faraday's law through the energy-and-coenergy argument that produces torque, then the DC machine where commutation does mechanically what electronics later does with switches, the transformer that isolates the whole idea of energy conversion from any motion at all, and finally the induction and synchronous machines that carry almost all of the world's electromechanical power. Pick any chapter below to begin, or follow the six parts in order for a complete course.