Topic 4_Induction_machine

Topic 4_Induction_machine - ECE341 Energy Conversion...

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1 J. Wang 4/18/2011 1 s Physical construction: Chap. 7: 1 s Basic concepts and equivalent circuit: Chap. 7: 2, 3 s Parameter measurement: Chap. 7: 11 s Power, speed, and torque: Chap. 7: 4-6 Topic 4: Induction Machine ECE341 Energy Conversion (Spring 2011) J. Wang 4/18/2011 2 Induction Machines: the Name • The name induction machine because the rotor voltage (which produces the rotor current and rotor magnetic field) is induced in the rotor winding rather than being physically connected by wires. • A distinguishing feature is that no DC field current, nor permanent magnet is required to run this machine.
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2 J. Wang 4/18/2011 3 Induction Machines: Construction Machine Construction: • Stator: An induction motor has the same physical stator as a synchronous machine. • Rotor: is of two types. 1.Squirrel Cage Rotor or simply cage rotor ( Work horse of the industry ) 2.Wound rotor (Not a popular type of machine) axis a - axis b - axis c - / 2 3 π / 2 3 / 2 3 b i a i c i ( ) a ( ) b J. Wang 4/18/2011 4 Induction Machines with Squirrel-cage Rotor Work horse of industrial applications, low cost, minimum maintains, and rugged construction. • The rotor of many induction generators has copper or aluminum bars shorted together at the ends, looks like a cage Can be thought of as a pair of magnets spinning around a cage Rotor current iR flows easily through the thick conductor bars
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3 J. Wang 4/18/2011 5 Nikola Tesla: Inventor of Induction Motor • Nikola Tesla (1856 to 1943) is one of the key inventors associated with the development of today’s three phase ac system. His contributions include the induction motor and polyphase ac systems. Unit of flux density is named after him Tesla conceived of the induction motor while walking through a park in Budapest in 1882. He emigrated to the US in 1884. The Tesla Coil in OSU’s High Voltage and Power Electronics Laboratory operates at 3 MV. Statue of Nikola Tesla at Niagara Falls J. Wang 4/18/2011 6 Tesla and Renewable Energy/Energy Efficiency Most wind turbines are based on induction machines because of its low cost and less need for maintenance ! http://www.youtube.com/watch?v=y2RQttpahqk
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4 J. Wang 4/18/2011 7 Operation Sequence from Standstill b Rotating magnetic field of stator revolves at synchronous speed b Flux lines cut rotor conductors, voltage is induced in rotor conductors b
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This note was uploaded on 04/01/2012 for the course ECE 341 taught by Professor Keyhani during the Fall '08 term at Ohio State.

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Topic 4_Induction_machine - ECE341 Energy Conversion...

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