design aspects of energy efficient induction motors?

Question

give me technical data

Answer 1

Energy efficient designs are those that:
- have power factor as close to unity as possible (unity would be ideal).
- eliminate load-sensitive losses such as rotor copper, stator copper, and core loss. This means maximum conductivity and low temperature rise. (Which, by the way, usually means building a machine that is approximately 25-50 percent larger than is the current 'optimum' design from a least-material-and-labor-cost perspective).
-eliminate load-insensitive losses such as windage and friction by making surfaces stremalined and cooling passages easy for the coolant to navigate ... while still adequately cooling the machine.

Armed with the above thoughts, you should be able to research methods for accomplishing each aspect ... although there is a high likelihood that some aspects are mutually exclusive.

Remember - you still have to meet the required torque and inrush specifications for the application ... which may mean the design is NOT an energy efficient one.