- The electric motor receives the energy at the input terminal and delivers it at the mechanical output terminals.
- The mechanical energy is given at the input terminal whereas the electrical energy produces at the output terminals in the case of generator.
- Energy – balance equation : Motor

Electrical Input energy = Mechanical Output
energy + Change in stored energy

- Energy – balance equation : Generator

Mechanical Input energy = Electrical Output
energy + Change in stored energy

- The energy balance equation can also be written in following way

dW

_{elect}= ( dW_{mech}+ dW_{f }+ dW_{loss}) ..... Motor
dW

_{mech}= ( dW_{elect}+ dW_{f}+ dW_{loss}) ..... Generator
Where

dW

_{elect}= Change in electrical energy
dW

_{mech}= Change in mechanical energy
dW

_{f }= Change in field energy
dW

_{loss}= Change in energy losses- The transferred energy are always taken as positive ( + Ve ) but change in stored energy in the coupling field may be either positive or negative in the energy balance equation.
- Its value can be taken as positive for increase in the stored energy and negative for decrease in the stored energy.
- If the losses in the electro – mechanical systems are neglected, the energy balance equation can be written in general form

Input energy = Output energy + Change in
stored energy

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