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10106031011113INDUCTION MOTORSIn induction machines, the rotor voltage (which produces the rotor current and the rotor magnetic field) is not physically connected by wires to the rotor windings—it is induced in the rotor. The main advantage of induction motors is that there is no need for dc field current to run the machine. An induction machine can be used as a motor or a generator. However, it has many disadvantages as a generator.
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Philip Kiameh: Electrical Equipment Handbook: Troubleshooting and Maintenance. INDUCTION MOTORS, Chapter (McGraw-Hill Professional, 2003), AccessEngineering Export