Energy Efficiency of Electrical Machines.

In the generation of electrical power; electrical machinery, converting mechanical energy into electrical energy is found to be quite efficient. Therefore, for overall improved efficiency of the energy system, electrical energy conversion to other useful forms(mechanical, thermal etc) must be carried out as efficiently as possible. Since major portion of the generated power is consumed in electrical drives, emphasis must be laid on efficient use of these drives. High efficiency of electrical drives can be achieved by

(a) Judicious design of electrical machinery.

(b) Proper matching of motor-load combination.

1. Judicious Design:- 

For electrical drive,

                             Power Efficiency =  Power                                                                                                                                                                                                              (Power output + losses)

Energy Efficiency = Power Output * H(number of hours or days in service)