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AC 3-phase Induction motor - - Findings of those 4 companies: Solectria, GE, Propulse, …etc can’t find the motor model mention in the web that Dr. Lam send to us. Find some GE AC motors (20hp or above), but the max. torque(58Nm) and weight(300lbs) did not meet our requirement. From Solectria, AC 42 is chosen. It can meet all the requirement of our EV (MAZAD Demio). Max. Torque Imax Cont. Power Efficiency rpm weight Dia/Length AC42 (HK$21592) 150Nm 240A 21kw 93% 4000rpm 133lbs 9.75”/14.5” Controller voltage Peak power UMOC340 312V 65kw Controller voltage Peak power UMOC440(HK$46000) 312V 78kw Too expensive Ok Ok Ok Heavier than DC Ok Too expensive Good Advantage: 1) AC motor can give out 40-50% more torque than DC motor ( But even the torque given by DC motor is enough for driven Demio) 2) By using AC controller, peak power given by AC motor can be more than 50kw under 312V, that means the EV can have top speed up to 120km/hr or more. ( Top speed for DC series motor: approx. 100km/hr) 3) Efficiency is 3-4% higher than DC series Disadvantage: 1) AC system is about 3-5 times more expensive than DC system controller (HK$40000-50000) battery ( as it is about 312V more batteries are needed (double the no. that used in DC) increase the cost and weight too - You can input less voltage (use less battery) e.g. 144V, the peak power will sure be less. For 144V, peak power is 36kw. performance is the same as the DC series but controller cost more 2) AC motor is heavier. However, there is another model that has weight similar to that of DC series, but the continuous power is not satisfied. Max. Torque Imax Cont. Power Efficiency rpm weight Dia/Length AC25 140Nm 240A 16kw 91% 3000rpm 104lbs 9.75”/13” Controller voltage Peak power UMOC340 312V 65kw Controller voltage Peak power UMOC440(HK$46000) 312V 78kw Ok Not enough Ok Ok Ok Too expensive Good Conclusion AC motor is normally used for high performance EV, it can tell from the specification that it really can do so, but it costs more. Once we change to AC system, costs will be double or triple, then I suppose we target to make a very high performance EV: Top speed = 100-120km/hr Range = 125- 150 mile or more Acceleration: 0-60 mph within 20s Then, we need to use NiMH battery, in order to increase the range of the EV up to 150mile or more. We can’t just input 144V but must be up to 312V(26 modules 12V batteries) so that we can get >50kw peak power to meet our top speed. As our system is so super, our car can’t be so small. It must be large enough to place the 26 modules 12V battery and tough enough to support the increase weight. As we have limited budget, I think it is better to use DC series motor. Its performance is not as well as AC motor, but at least our EV can run and the cost is within our budget. For Demio, as the weight of the car increase, it affects the performance: Total weight: 3500lbs Top speed: 100km/hr Normal speed: 40km/hr Range: 75 mile (12 modules 12V battery)