The industrial ones are, the easy to get, suitable motors are rated around 11-15kW, 4 pole which means peak torque of 200-300 Nm which is only suitable for direct drive in the small car I am thinking of. (it would break the gearbox I suspect). It makes sense to leave the gearbox out as the motor puts out almost as much torque as the original car does through first gear (so it will be as zippy, but won't break the diff!)Rattrap wrote: woody is there a reason why u are comparing the AC as direct drive? Are AC systems better suited to direct drive?
The DC direct drive option isn't an option at the moment, as Zeva has proved the Available controllers (Kelly, Curtis) aren't suitable for direct drive
I'm not skewing them on purpose. It's just how the numbers fellGow864 wrote:Woody An excellent example of how numbers can be scewed to suit.
I only know of 7 AC car converters in Australia at the moment: 4 (acmotor, a4x4kiwi, Johny, Sparky Brother) are doing Industrial AC, 2 (Paul Gellatly, Ross Blade I.E. bev.com.au are using Azure), 1 (miked) is using MES-DEA stuff from metric mind.Gow864 wrote: How about using prices of equipment designed for an EV? In reality I would imagine very few converters would be using industrial AC motors and second hand VFD's I think that this is the domain of the expert.
My sample is not big enough to say that the majority are going one way or the other.
The industrial stuff is well documented, suitable for cars (accellerator = torque control), and has many handy features (e.g. a4x4kiwi has set up his drive to provide a pulse to drive his factory hilux speedometer).
It's not as simple as the curtis, neither is the zilla, or the kelly.
I'm just going with what I know. Unfortunately all the Australian distributors of stuff have pulled the prices from their websites until the currency decides what it's going to doGow864 wrote: Maybe it would be a good excersize to build (theoretically) comparable AC and DC systems using NEW equipment sold for the purpose of EV. This could be good for everyone. Maybe a thread containing suggested setups approximate costs and performances (if that can be done)
The Azure AC55 (comprable to a 4 pole 11kW industrial) was about AU$9000 before th dollar piked.
The Telemecanique 82kW (peak) industrial drive is list price US$7762.
I don't know how much a discount you can get from the list price