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
dWelect = ( dWmech
+ dWf + dWloss )
..... Motor
dWmech = ( dWelect
+ dWf + dWloss ) ..... Generator
Where
dWelect = Change in
electrical energy
dWmech = Change in
mechanical energy
dWf = Change in field energy
dWloss = 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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