EV 3phase + auto

Author	Message
Warpspeed Guru Joined: 09/08/2007 Location: Australia Posts: 4406	Posted: 10:59am 26 Nov 2012         perth said   do people use big induction motors like these in cars? The main problem with using a motor like that in a vehicle would be the huge physical size and very high weight for the power it produces. The reason being that three phase induction motors are relatively slow turning high torque devices, and they require large heavy cast iron frames and a lot of copper to work as efficiently as they do. That particular one, (four pole) would turn at maybe 1450 rpm at 50Hz to generate it's 30Hp. As a guess, it probably weighs about 150 Kg and might be 350 mm diameter and 400mm long. A comparable high speed dc motor might generate 30Hp at 8,000 rpm, but be a quarter of the diameter and one eighth of the weight. With a light weight reduction gearbox the high speed dc motor would be much more suitable for a vehicle. Cheers,  Tony.