Induction motor is preferred choice of manufacturer and customer primarily due its robustness, easy manufacturing, and low maintenance. But is this the most efficient motor? Answer is obviously no. Efficiency is function of losses, so let us revisit the Induction Motor losses as shown in figure1. Now if compare these losses with permanent magnet (PM)motor, we would notice that there is rotor copper loss which is almost 15 to 20% of overall losses.
As these losses goes down the cooling requirement of motor can be reduced.
Read full article @ http://www.evhub.in/content/permanent-magnet-motors-introduction-and-trends/
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