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3-Phase Induction Motors - UNLV

Induction Motors EE 340 Where does the power generated go? The electric energy generated purchased by consumers for different needs. This energy is converted to different forms: Lighting (indoor/outdoor CFL, incandescent, LED, ) Heating (electric water heaters, clothes dryers, electric stoves and ovens) power supply of electronic devices (computers, TV, DVD, battery chargers, home automation, ) Industrial (arc furnaces, welders, manufacturing ) Conversion to mechanical power by Motors (pumps, fans, HVAC, refrigeration compressors, power tools, food processors, escalators, elevators, ..) Types of Electric Motors 3-Phase Induction machine construction 3 stator windings (uniformly distributed as in a synchronous generator) Two types of rotor: Squirrel cage Wound rotor (with slip rings) The rotating magnetic field The basic idea of an electric motor is to generate two magnetic fields: rotor magnetic field and stator magnetic field.

• Core loss is embedded with friction, windage and stray-load loss v AG L d m AG d c L L P P P I R S S P I R S P I R P I R W Z W Z 3 (1 ) / 3 ( / ) 3 3 2 2 2 2 2 2 2 2 2 1 2 1. Thevenin equivalent circuit and torque-slip equation > 2 @ 2 2 2 2 2 2 1 1 1 1 /( ) 3 /, ( ) R S X P V R S X X X X R X X X V sync TH TH TH sync AG ind M M TH TH M M TH ...

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