Quote:
Originally Posted by johnrobholmes
Thanks for the detailed info. Good enough for me :D
So what is the controller and shunt resistance of the ICE HV 160 (no wires)?
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360 microohms for the FETs, and 125 microohms for the shunt. Copper resistance is around 50 microohms.
~22 watts total I^2R controller losses at 160A. (or approx .45 watts per FET) This doesn't include switching losses. Switching losses depend on the commutation speed of the motor -- but a good "middle of the road" estimate is approx. 8 watts of switching losses at full throttle. (Partial throttle switching losses are higher -- because the PWM losses are combined with the commutation losses.)
At 50V, 160A, full throttle, this gives an efficiency of ~99.63%
(note: the losses on the controller is about the same as the losses in the ~25" of 8ga wire attached to the controller... 8 ga wire is approx. 600 microohms per foot -- total losses in the wires at 160A is approx. 32 watts... and the numbers are even better on the ICE-200 and MM-XL, because the FET resistance is only 213 microohms...)
Pretty damn good, I think.
