Ebooks free downloads

About The Book
File Type : PDF
File Size : 14.8MB
Pages : 531
Authors : Wiley 



DESCRIPTION :
Electrical machines are almost entirely used in producing electricity, and there are very few
electricity-producing processes where rotating machines are not used. In such processes,
at least auxiliary motors are usually needed. In distributed energy systems, new machine
types play a considerable role: for instance, the era of permanent magnet machines has now
commenced.
About half of all electricity produced globally is used in electric motors, and the share of
accurately controlled motor drives applications is increasing. Electrical drives provide probably
the best control properties for a wide variety of processes. The torque of an electric motor
may be controlled accurately, and the efficiencies of the power electronic and electromechanical
conversion processes are high. What is most important is that a controlled electric motor
drive may save considerable amounts of energy. In the future, electric drives will probably
play an important role also in the traction of cars and working machines. Because of the
large energy flows, electric drives have a significant impact on the environment. If drives
are poorly designed or used inefficiently, we burden our environment in vain. Environmental
threats give electrical engineers a good reason for designing new and efficient electric
drives.
More books..