According to IEC standard, induction machines with a rated output of 0.75~375 kW must meet either the IE3 efficiency level or the IE2 level if fitted with a variable speed drive. For the famous electric machine companies, they are already to produce IE3 level products. Development of IE4 level products means higher efficiency, less losses and better cooling, all of which depend upon both magnetic and thermal analyses. This paper presents motor efficiency and loss distribution using motor CAD, and describes, which factors would influence temperature of coil distribution on motor.