Losses, Efficiency, and Power Factor • Core losses • power losses (I
Download
Report
Transcript Losses, Efficiency, and Power Factor • Core losses • power losses (I
Losses, Efficiency, and Power Factor
• Core losses
– hysteresis and eddy-current losses in the
stator and the rotor
• power losses (I2R losses) in the stator
windings
– stator copper losses, also called stator
conductor losses
ECE 441
1
Net Power Crossing the Air Gap
Pgap Pin Pcore Pscl
Power-Flow Diagram
ECE 441
2
Look at Total Power Loss
Ploss Pscl Pcore Prcl Pf ,w Pstray
ECE 441
3
Useful Shaft Power Output
Pshaft Pmech Pf , w Pstray
Pshaft
Tshaft nr
5252
ECE 441
4
Efficiency and Power Factor
Efficiency is the ratio of useful power out
to the total power in.
Pshaft
Pin
Power Factor is the ratio of active power to
apparent power.
Pin
Fp
Sin
ECE 441
5