View
214
Download
1
Category
Preview:
Citation preview
3-phase Supply
(3 voltages, 120o apart)
3-phase Motor Stator
(3 Windings, 120o apart)
Phase A (Red)
Phase B (Black)Phase C (Blue)
Arrows show Magnetic Fluxwhen phase voltage is POSITIVE
A B C
3-phase Motor Stator
(3 Windings, 120o apart)
Each step is shownhere at 0.5 seconds(6 seconds per cycle)
Green dotted lines show resulting magnet flux
Green arrow shows flux direction
Three-phase sequence produces resulting ROTATINGMAGNETICFLUX
3-phase Motor Stator
(3 Windings, 120o apart)
The STATOR core is a stack of thin silicon steel LAMINATIONS
3-phase Motor Stator
(3 Windings, 120o apart)
Windings are coils placed in SLOTS around the STATOR
The coils are connected in groups for each of the THREE PHASES
Speed – Frequency - PolesThe SPEED of the rotating magnetic field is determined by:
120Synch
fN
P
SynchronousSpeed (rpm)
Frequency(Hz)
Number of Polesper phase
x2 Poles to PAIRSx60 rps to rpm
Recommended