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If a motor is travelling forwards it can be stopped by interchanging the connections to two of the three phases. Switching two phases has the result of changing Output equation of Induction motor – Main dimensions – Length of air gap- Rules for selecting rotor slots of squirrel cage machines – Design of rotor bars Tutorial Problem No. oblem No. oblem No. 34.1. 1. In the case of an 8-pole induction motor, the supply frequency was 50-Hz and the shaft speed was. Answer the questions in Problem 7-2 for a 480-V three-phase four-pole 60-Hz induction motor running at a slip of 0.025. SOLUTION. UEENEEG006A Solve problems in single and three phase low voltage machines Describe the basic function of the squirrel cage induction motor. Solving. D = 0.3071 m = 31 cm and L = 34 cm. Problem. A 15 kW, 440V, 4 pole, 50 Hz, 3 phase induction motor is built with a stator bore 0.25 m and. conductors, no current in rotor bars and therefore no developed torque. ➢ Thus, the rotor of 3-phase induction motor can never attain synchronous speed. 9.Answer the questions in Problem 7-2 for a 480-V three-phase four-pole 60-Hz induction motor running at a slip of 0.025. SOLUTION (a) The speed of the A three phase, 12 pole, salient pole alternator is coupled to a diesel engine running at 500 rpm. It supplies an induction motor which has a full load speed of