ABSTRACT
Motor systems are by far the most important type of electrical load, ranging from small fractional hp
motors incorporated in home appliances to multi-megawatt motors driving pumps and fans in power
plants. Motors consume over half of the total electricity, and in industry they are responsible for about
two-thirds of the electricity consumption. In the commercial and residential sectors motors consume
slightly less than half of the electricity. The cost of powering motors is immense; roughly $100 billion a
year in the U.S. alone. There is a vast potential for saving energy and money by increasing the efficiency of
motors and motor systems.
