Hello From Castlemaine

Technical discussion on converting internal combustion to electric
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Adverse Effects
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Post by Adverse Effects » Wed, 25 May 2016, 14:29

there is 1 sort of direct drive option i have seen and liked but its not cheep lol

torquetrends ev-TORQUE BOX

Image

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Richo
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Post by Richo » Wed, 25 May 2016, 20:57

Madmax wrote:it seems an industrial motor... of acceptable size/mass is limited in speed range?
Johny wrote:Not at all...
coulomb wrote:Pretty much.


Image You guys are funny Image
As Johny points out the motors max (safe) rpm depends on it's balance and bearings.
I'm assuming Coulomb is now referring to the continuous power the motor produces at a given RPM.
So your both right Image

I have pasted this graph in so it's not specific to madmax's issue - it's just an example.
You can compare the "aero power" to the "gear-4 nom" power.
At some point the aero power requirements are higher than the nominal power from the motor.
So in this case it crosses over at ~90kph.
But don't forget this is the "continuous" rating.
You could reasonably expect to go over 100kph for short periods.
High RPM is possible, High RPM isn't a requirement.
Image

EDIT:just noticed 4-th gear data LOL
Last edited by Richo on Wed, 25 May 2016, 11:09, edited 1 time in total.
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Richo
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Post by Richo » Wed, 25 May 2016, 21:06

As I mentioned before the problem won't be the industrial motor.
Anyone can go around the corner and pick-up any aluminum variant from 1/10HP to 25HP off the shelf and have it re-wound and balanced.

The main issue is still you need a "triple-zilla" to run it.
That's why I said you need to look at the motor and controller as a package cost.
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Post by Madmax » Thu, 26 May 2016, 16:10

Big thanks to everyone for showing such interest in my potential ev project!

Is there such thing as a 132L frame?

What are the options with controllers for 132 and 160 frame rewound ac motors?

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Post by woody » Thu, 26 May 2016, 16:32

I found a link to the ABB industrial motor catalogue here:
http://new.abb.com/motors-generators/ie ... num-motors

https://library.e.abb.com/public/287581 ... 042016.pdf


3GAA132280 is a 15kW 4 pole 132 SMH frame p87

The Torque listed nominal (Tn) is 98.4Nm.
The "Breakdown Ratio" (Tb/Tn) is 2.9. This indicates that the motor can produce about 2.9 * 98.4 = 285Nm Direct Online (DOL) i.e. plugged into the grid.
With a controller you can usually get a bit more.

The dimensions are also in the catalogue p115ff.

Controllers: there is the industrial route (e.g. ABB ACS800 or ACS500)
DIY: http://www.instructables.com/id/200kW-A ... ctric-Car/
Rhinehart: http://www.elmofo.com.au/ac-motor-controllers.html
Tritium and others.
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coulomb
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Post by coulomb » Thu, 26 May 2016, 18:55

woody wrote: With a controller you can usually get a bit more.

Yes. In the case of Mexy the electric MX-5's motor, about 28% more:

Image

3.8 (a relatively large Tmax/Tn factor) x 72 = 274 Nm; the motor achieved over 350 Nm as shown in the Tritium dynamometer graph on the previous page. 350 / 274 ~= 128%. It's possible that with a more powerful controller and/or battery (the Tritium test pack was a little tired), even more could have been achieved. This is with a "high output design" motor; other motors may differ.

Last edited by coulomb on Thu, 26 May 2016, 08:56, edited 1 time in total.
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Richo
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Post by Richo » Thu, 26 May 2016, 20:59

~$12,000 ABB ACS800
~$7,500 Rhinehart: http://www.elmofo.com.au/ac-motor-controllers.html
~$6,600 Tritium
~$3,400 ABB ACS500 (USED)
~$1,400+labour DIY: http://www.instructables.com/id/200kW-A ... ctric-Car/

EDIT:updated prices

Last edited by Richo on Fri, 27 May 2016, 11:14, edited 1 time in total.
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Post by TooQik » Thu, 26 May 2016, 22:09


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Johny
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Post by Johny » Thu, 26 May 2016, 23:01

...and the trailer to cart it around in would only be another $1500.

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Post by Madmax » Sat, 28 May 2016, 00:45

I have a couple of these..... The hearts of 30kw inverters

Image

Image

Although the igbts are probably not suitable for high current low voltage... Rated at 100A

http://www.mitsubishielectric.com/semic ... 24nf_e.pdf
Last edited by Madmax on Sun, 29 May 2016, 15:40, edited 1 time in total.

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Johny
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Post by Johny » Sat, 28 May 2016, 22:49

Cm100 are 100 Amp IGBTs - good for about 70 ARMs. Just a bit small unfortunately.

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Post by Madmax » Mon, 30 May 2016, 20:32

Maybe a decent DIY charger...?

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Johny
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Post by Johny » Mon, 30 May 2016, 20:47

Don't know about t a DIY charger. Given the price of batteries I would tend not to trust a prototype charger to take care of them. It really depends how proficient you are at that type of thing.
You could use them to turn the heater on and off?

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