**Energy Balance
Theory**

In this article, the energy
balance theory is given which is given to the most of rotating machines. 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 Theory: Motor**

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

**Energy Balance Theory: Motor**

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

**Energy Balance Theory Equation**

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

You may also like to read these articles:

Single
Excited System – Doubly Excited System

How
voltage is built up in Generator?

Armature
Reaction in the DC Generator

Current
harmonic – Voltage harmonic

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