Quote:
Originally Posted by Old Tele man
Most AC-motors are multi-phase (ie: 3-phase) because they *work* using rotating magnetic fields (plural = phases)...whereas DC-motors typically use only a single winding (but CAN actually have multiple windings) and thus are only 'single' phased.
It was only meant to clarify the fact that "...maximum torque at low speed..." is a hallmark of DC-motors, but not so of AC-motors.
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OK.
The Torque/Power graph here is a bit confusing to me. I, like you, would not have expected torque to peak at the lowest rpm recorded.
http://www.hpevs.com/Site/power_grap...ak%20graph.pdf
HPEVS must have a rotor design quite different from a typical AC induction motor ... I have seen (at work) maybe 150 - 200% of motor rated torque at 0 rpm but it increases to maybe 250% (briefly) from about 5 or 6 Hz up to rated frequency. In the case of the AC35 I'd almost guess that 900 rpm is the rated frequency?
The AC34 curve looks more like I'd expect from an induction motor, rated for 1800 rpm.
http://www.hpevs.com/Site/power_grap...ial%20peak.pdf
The AC-34 was done at 48V, so it's not a perfect comparison ..
I'd have to agree with EVMetro's assessment that having less gear reduction from the motor to the wheels would give the AC35 a higher top end and make it more fun to drive. Perhaps second gear will become more useful as well.