ABSTRACT
This chapter discusses the alternating current induction motors; motor properties such as load factor, efficiency and power factor; and calculating motor electrical loads; and applications and analysis of motor variable speed drives. Just a small improvement in electric motor efficiency can produce significant savings in the energy cost of operating a piece of equipment. One of the authors of this book has performed over 100 audits of medium-sized manufacturing companies, and the average motor load factors have ranged from about 30-40%. Electric motors, taken together, make up the single largest end use of global electricity. Electric motors provide efficient, reliable, long-lasting service, and most require comparatively little maintenance.
