- #1
thomasorange
- 3
- 0
Hi,
I'm looking around for a replacement alternator and came across the specs which state max current available at 6000rpm and requires 47nm of torque.
I was quite suprised with this needing that amount of torque. So I'm starting to imagine a typical diesel which most don't get up to 6000rpm. So I'm imagining there is some kind of gearing between the engine and alternator, perhaps 1:2, so at 3000rpm of the engine the alternator is 6000rpm. With the alternator needing 47nm of engine power (after gearing) it would now need 94nm before gearing.
Is this right? Does this alternator just swallow a lot of the engines torque just to run a flat out electrical system? Agreed, it shouldn't need this power all of the time hence run at lower torque but I'm suprised what the alternator takes?
Are these figures accurate?
Thanks
I'm looking around for a replacement alternator and came across the specs which state max current available at 6000rpm and requires 47nm of torque.
I was quite suprised with this needing that amount of torque. So I'm starting to imagine a typical diesel which most don't get up to 6000rpm. So I'm imagining there is some kind of gearing between the engine and alternator, perhaps 1:2, so at 3000rpm of the engine the alternator is 6000rpm. With the alternator needing 47nm of engine power (after gearing) it would now need 94nm before gearing.
Is this right? Does this alternator just swallow a lot of the engines torque just to run a flat out electrical system? Agreed, it shouldn't need this power all of the time hence run at lower torque but I'm suprised what the alternator takes?
Are these figures accurate?
Thanks