Sol. a) Single phase,split-phase AC motor b) 6-pole No-load Speed 1200 rpm (Norton Table 2-6) Full-load Speed 1140 rpm T= 63000H n T=63000H_63000×0.7 1140 =414bim n c Tsar =1.5Trated Tn =1.5Trated =1.5x41.4lb.in=62.2lb-in d)Tbreak =345%Trared Tbreak=345%T,med=345%×41.4=142.81b.in Problem 3: Three examples of motors,with their parameters are listed in the Table below.For each case pick the best motor. a)A rotary load with a moment of inertia of 0.02 Kg m2 is driven by a gear reducer. Select the motor that produces the minimum power dissipation and the motor that results in minimum temperature rise.Find the optimal gear ratio in either case. b)A mass of M=0.75 Kg must be driven by a pulley.Select the motor that can drive it under minimum temperature rise and find the optimal radius size.Sol. a) Single phase, split-phase AC motor b) 6-pole No-load Speed 1200 rpm (Norton Table 2-6) Full-load Speed 1140 rpm c) d) T T break rated  345% Problem 3: Three examples of motors, with their parameters are listed in the Table below. For each case pick the best motor. a) A rotary load with a moment of inertia of 0.02 Kg m2 is driven by a gear reducer. Select the motor that produces the minimum power dissipation and the motor that results in minimum temperature rise. Find the optimal gear ratio in either case. b) A mass of M = 0.75 Kg must be driven by a pulley. Select the motor that can drive it under minimum temperature rise and find the optima1 radius size. 63000H T n  63000 63000 0.75 41.4 1140 H T lb in n     1.5 T T start rated  1.5 1.5 41.4 62.2 T T lb in lb in start rated      345% 345% 41.4 142.8 T T lb in break rated    