Rotating Electrical Machines

Abstract

One of the most striking features in the development of rotating electrical machines has been the steady increase in their output. This marked increase was made possible by a combination of several factors, of which the most important include improvements in the magnetic properties of the sheet steel used for core material, as well as the development of insulating materials capable of withstanding relatively high temperatures, and better provision for cooling. This chapter is divided into two parts: Synchronous Machines and Induction Motors. For both types of machines considerations about insulating materials, cooling and construction are presented with a focus on the main aspects involved, as well as about their performance under different conditions of operation. Special emphasis was given to international standards. The effect of machine dimensions on the rating of synchronous and induction machines is included, as well as other design parameters. The application of variable frequency drives on induction motor speed control is highlighted. Some advanced technologies in synchronous generators and motors such as: superconducting generators and motors; per­manent magnet motors; switched reluctance motors and line start permanent magnet motors, as well as those related to die cast copper and linear induction motors are presented.