- #1
Bcavender
- 21
- 4
I am attempting to make a basic model of an alternator and determine terminal voltage levels at several different current levels.
The alternator design looks like this:
900 RPM fixed, 60hz, single phase
2000 gauss permanent magnet Flux Density, Magnet circumferential velocity 9.58 m/sec,
4 Coils w/220 turns each, 57.5 meters of 15awg/coil, 230m total
Total DC Resistance 2.4 ohms, Total Inductance 9.5 milliHenries
I compute open circuit voltage to be 121.1v RMS and 171.2 P-P.
As current begins to flow, I understand that back emf is generated as the load current is also moving in the magnetic field, but in opposition to the direct voltage generated.
I would like to calculate the back emf at 0.5, 1, 2, 3 and 5 amps load current.
I have searched the net for a method/formula that would allow me to calc the counter emf as the alternator load current increases, but I am not finding a good, reliable resource for this.
Any suggestions about resources or formulae to move this ahead would be greatly appreciated!Bruce
The alternator design looks like this:
900 RPM fixed, 60hz, single phase
2000 gauss permanent magnet Flux Density, Magnet circumferential velocity 9.58 m/sec,
4 Coils w/220 turns each, 57.5 meters of 15awg/coil, 230m total
Total DC Resistance 2.4 ohms, Total Inductance 9.5 milliHenries
I compute open circuit voltage to be 121.1v RMS and 171.2 P-P.
As current begins to flow, I understand that back emf is generated as the load current is also moving in the magnetic field, but in opposition to the direct voltage generated.
I would like to calculate the back emf at 0.5, 1, 2, 3 and 5 amps load current.
I have searched the net for a method/formula that would allow me to calc the counter emf as the alternator load current increases, but I am not finding a good, reliable resource for this.
Any suggestions about resources or formulae to move this ahead would be greatly appreciated!Bruce