(1) Explain how a linear induction motor operates? (2) An overhead crane in a factory is driven horizontally by means of

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1 Explain How A Linear Induction Motor Operates 2 An Overhead Crane In A Factory Is Driven Horizontally By Means Of 1 (457.78 KiB) Viewed 45 times

(1) Explain how a linear induction motor operates? (2) An overhead crane in a factory is driven horizontally by means of two similar linear induction motors, whose rotors are the two steel I-beams, on which the crane rolls. The 3-phase, 4-pole linear stators, which are mounted on opposite sides of the crane, have a pole pitch of 60 mm and are energized by a variable frequency supply. When one of the motors was tested, it yielded the following results: stator frequency = 25 Hz, Power to stator = 6 kW, stator copper loss = 1.2 kW, crane speed - 2.4 m/s Calculate: (a) synchronous speed and slip (b) power input to rotor (c) copper losses in the rotor (d) gross mechanical power developed (e) thrust