Boncuk
New Member
Boncuk,
You're talking about AC motors, this thread is about DC motors.
Anyway, it's not true, the current is directly proportional to the torque.
Attached is a graph from one of the DC data sheets I linked to previously.
No problem for me. I can live with your statement. Still not got through. Torque alone is no measurement for mechanical work.
My statement was: Doubling mechanical power means four times higher electric power demand, which is represented by the steep curve in your graph.
I guess DC-motors don't behave much different.
Practical work showed different results.
May be they apply for aerodynamic applications only (which I doubt), which also holds true for jet engines. Doubling aircraft top speed requires about four times the thrust - just because aerodynamic resistance increases by the power of two with increasing speed.
Just for comparison: The RF4-E (Phantom) used internal and external (wing and belley tanks) for subsonic flight (max. Mach 0.96) for an endurance of 3 1/2 hours flight time. It used internal tanks for a flight time of 20 minutes at Mach 2.4. (subsonic 1 1/2 hours). (One minute of afterburner operation (English: relight) required 1,700lbs of additional fuel per engine)
Physical laws can't be bent, either using reciprocal fuel engines and jet engines or electric motors - AC or DC.
Boncuk
Last edited: