Induction Motors

Authored by: Sergey Edward Lyshevski

Mechatronics and Control of Electromechanical Systems

Print publication date:  May  2017
Online publication date:  July  2017

Print ISBN: 9781498782395
eBook ISBN: 9781315155425
Adobe ISBN:

10.1201/9781315155425-5

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Abstract

In high-performance drives and servos, permanent-magnet electric machines are the preferable choice. Robust low-cost fractional horsepower single- and three-phase induction machines are widely used [1,2,3,4,5 and 6]. In industrial applications, three-phase induction motors are very effectively used in medium- and high-power drives up to thousands kilowatts. Compared with permanent-magnet machines with the rated power limit of ~100 kW, induction motors have lower torque and power densities and may not be effective as generators. However, induction motors guarantee high power and require simple power electronics. Induction motors were invented and demonstrated by Nicola Tesla in the 1880s. He made indispensable contributions to science, engineering, and technology by inventing AC electric machines (synchronous and induction machines), transmission lines, transformers, radars, wireless communication, etc. Tesla pioneered, developed, and commercialized the theory and technology of time-varying AC electromagnetics. He controlled induction motors by polyphase AC voltage systems, demonstrating the speed control capabilities in the late 1880s. Nicola Tesla designed and demonstrated two-phase induction motors in 1883. Three-phase squirrel-cage induction motors were demonstrated by Mickail Dolivo-Dobrovolsky in the 1890s. In induction motors, the electromagnetic torque results due to the interaction of the time-varying electromagnetic fields. The images of an induction and permanent-magnet machines are illustrated in Figures 5.1.

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