Sutho's DMC EV Electric DeLorean

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tsport100
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Sutho's DMC EV Electric DeLorean

Post by tsport100 » Sun, 03 Mar 2013, 17:37

So it's 600 Nm for 18 sec launch and 400 Nm for 60 sec peak?

What bus voltage are you running? The published Evo Electric data sheet seems to suggest their peak numbers were recorded @ 600v.

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Post by Sutho » Sun, 03 Mar 2013, 18:37

Running a 370VDC bus. Are you saying that the motor is not producing the torque that I have quoted?

The voltage affects the base speed. EVO motor constants are below. You can use this to work out the peak torque at 450Arms.

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Post by tsport100 » Sun, 03 Mar 2013, 19:16

So yours is a 4 pole AFM-140-4?

Just trying to make sense of Evo's data sheet as they don't quote peak current and I noticed that the efficiency chart is for a 140-4 tested @ 600VDC wired in star.

BTW what final drive ratio are you running?

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Post by tsport100 » Sun, 03 Mar 2013, 19:23

ok, can see from your numbers yours is an AFM-140-3.

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Post by woody » Mon, 04 Mar 2013, 04:25

You can measure torque by pushing or pulling something with the car whilst stationary, and measuring the force, e.g. with a load cell. 600Nm of torque through a 3:1 diff = 1800Nm at the wheels * 33cm radius = 5400N force in direct drive =~ 550kg force. Probably a dyno is easier that rigging something up yourself if you don't have a tow bar...
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Post by Sutho » Tue, 05 Mar 2013, 01:35

A short video of the Delorean ripping around our carpark. :-)

YouTube: Electric Delorean

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Post by jonescg » Tue, 05 Mar 2013, 04:23

Nice one! What gear was that in?
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Post by Sutho » Tue, 05 Mar 2013, 14:31

That's second gear and there's no clutch.

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Post by Sutho » Mon, 25 Mar 2013, 02:37

Put the electric DeLorean on a dyno yesterday.

A brief video can be seen here: DMCEV Dyno Run

The dyno results chart is below. The red lines are the power and torque curves for a near stock 2.8L V6 DeLorean. The blue lines are the results of the Electric Delorean.

Image

Results are 180hp (134kW) and 357 ftlbs (484Nm) at wheels. Based on a rough transmission loss of 20%, these figures are pretty much in line with the motor/controller performance specs.

EVO quote peak power of 167.5kW
Dyno result 134kW/0.8 = 167.5kW

EVO quote Nm = 1.36 x Amps = 1.36 x 450 = 612Nm
Dyno result 484Nm/0.8 = 605Nm

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Post by antiscab » Mon, 25 Mar 2013, 03:50

20% transmission loss is pretty bad - shame there's no easy way of measuring it
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Post by antiscab » Mon, 25 Mar 2013, 03:58

134kw at the wheels is pretty good though, what were the battery volts and amps (at peak power?)
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Post by Sutho » Mon, 25 Mar 2013, 15:03

A transmission loss of 20% is pretty typical. 15% would be very efficient. Also keep in mind that this is a 31 year old transmission.

We were there for a DeLorean tech day, so didn't spend enough time on the dyno to get to laptop out. Will do this in more detail at a later date.

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