Citroen DS Zero Emission

Oktober 2007 von Netgain

Hi George,

Thank for you detailed answer.

There's another question you might help me with.

I can't decide which Motor shall I take for my transformation.

When driven with the same parameters, does the Warp11 use dramatically more energy than the Warp9 ?
... less range with Warp11?

Thanks in advance

Regards Josef

Josef,

This is a truly difficult question to answer! In general, the WarP 11 is slightly more efficient than the WarP 9. It is capable of producing about twice the torque of the 9, but at 1/2 the RPM's. The WarP 9 will draw about 50% more Amps to match the torque of the 11 (from memory and not exactly accurate...).

    So which is a better match for your vehicle? You would need to approximate the finished vehicle weight (as a rule of thumb, I add 1,000 lbs to the gas weight!) If the vehicle is ~3600 pounds or less you could use a WarP 9, any heavier and you should strongly consider a WarP 11. A WarP 9 would probably work well with a transmission and a 3.5-3.73 rear gear. A WarP 11 would probably work well with a transmission and a high 2, low 3 rear gear ratio.

Enjoy,
    George

Juni 2007 von Netgain

Hello,

In your spec sheet you write for the WarP11 43HP and 135ft/lb at 72

Volts.

Do you know the spec at 144Volts or 288Volts?

Regards Josef

Josef,

Amps affect torque, doubling the voltage will double the RPM.

Electrical horsepower is:

( Volts * Amps) / 746) )

144V*452.8 A = 65203.2 Watts / 746 = 87.40 HPe

288V*452.8 A = 130406.4 Watts / 746 =174.8075 HPe

Mechanical Horsepower is:

(RPM * Ft. Lbs) / 5252

1442 RPMs * 135 ft. lbs. / 5252 = 37.06 HPm (72 Volts)

2882 RPMs * 135 ft. lbs. / 5252 = 74.08 HPm (144 Volts)

5764 RPMs * 135 ft. lbs / 5252 = 148.16 HPm (288 Volts)

BTW: The motor armature should never see more than 170 Volts, so the

288 volt figures would represent a theoretical number...

Enjoy,

George Hamstra