- #1
gtbiyb
- 10
- 0
Hello all!
Ive been thinking about car alternators... and have a few questions!
Does a car alternator have to be able to supply max power at engine idle speed? My thought being that you could turn on all electrical devices in your car at this speed. I do notice however that when you turn lights on etc at idle you can here the engine drop a few revs under the load.
From this i have formed a theory in my head so would appreciate some comments on its accuracy...!
Power = 2 X PI X rpm x torque
Therefore at engine idle the rpm is fixed and so if the power demand increases the only variable that can change is torque and so the alternator resisting torque increases to balance the equation.
Do alternators work like this?! If so, if you had a second alternator in parralel, run from an imaginary power source then would the electrical power demand be shared equally between them?
Many thanks for any help offered.
Matt
Ive been thinking about car alternators... and have a few questions!
Does a car alternator have to be able to supply max power at engine idle speed? My thought being that you could turn on all electrical devices in your car at this speed. I do notice however that when you turn lights on etc at idle you can here the engine drop a few revs under the load.
From this i have formed a theory in my head so would appreciate some comments on its accuracy...!
Power = 2 X PI X rpm x torque
Therefore at engine idle the rpm is fixed and so if the power demand increases the only variable that can change is torque and so the alternator resisting torque increases to balance the equation.
Do alternators work like this?! If so, if you had a second alternator in parralel, run from an imaginary power source then would the electrical power demand be shared equally between them?
Many thanks for any help offered.
Matt