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tim9000
- 867
- 17
If a motor is such-and-such Hp or kW, is that the Output power, or the Input power?
Huh, ok that's a surprise.davenn said:from memory its the output power as measured at the driveshaft
Dave
tim9000 said:Just thought I'd throw that in as an oddity, I don't understand how.
Also, with a chassis dynamometer or rolling road, power output is measured at the driving wheels. This accounts for energy or power loss through the drive train inefficiencies and weight thereof as well as gravitational force placed upon components therein.
In general:
Nominal or rated horsepower is derived from the size of the engine and the piston speed and is only accurate at a pressure of 48 kPa (7 psi).[23][clarification needed]
Indicated or gross horsepower (theoretical capability of the engine) [ PLAN/ 33000]
minus frictional losses within the engine (bearing drag, rod and crankshaft windage losses, oil film drag, etc.), equals
Brake / net / crankshaft horsepower (power delivered directly to and measured at the engine's crankshaft)
minus frictional losses in the transmission (bearings, gears, oil drag, windage, etc.), equals
Shaft horsepower (power delivered to and measured at the output shaft of the transmission, when present in the system)
minus frictional losses in the universal joint/s, differential, wheel bearings, tire and chain, (if present), equals
Effective, True (thp) or commonly referred to as wheel horsepower (whp)
What I think is odd is that I'd have thought that if you multiplied the terminal voltage by the current going into the motor, that, that'd be the total input power. However in my qustion it turned out that the output power + loss' were greater than that, hence the input was greater than VI at the terminal.davenn said:why do you think it's odd?
Can you post the question word for word. In other sections of the forum (eg the homework section) this is a rule because it frequently turns out that the OP has misunderstood or misinterpreted the question.tim9000 said:Huh, ok that's a surprise.
It's funny that I'm doing a practice question...
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