[ausev] good motor generator

[m. howse]

Compared to 3500 dollars, it's a bargain. And I wouldn't care about it  
being 2' long. All of
my donor vehicles, 71 Beetle, 86 MR2 and 86 Stanza can easily handle that.  
Sure it isn't perfect
but I can't afford to spend 10=20k on a conversion or 100k on a new EV  
like some.
Besides, I also wouldn't care if a vehicle I built couldn't go over 50 and  
on top of that the
link was primarily to show that there are less expensive alternatives  
available to work with if
someone is interested in doing a prototype first.

marv

On Sat, 07 Jun 2008 00:23:25 -0500, Chris Robison <chris at chrisrobison.org>  
wrote:

> m. edmund howse wrote:
>> http://cgi.ebay.com/NEW-10-HP-8700W-DC-WIND-GENERATOR-MOTOR_W0QQitemZ230256987038QQihZ013QQcategoryZ42922QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
>
> Even if you could install it (the motor pictured is over 2 feet long)
> this actually would be a poor choice for use in an EV, due to its low
> power density (most likely from the weight of the permanent field
> magnets, plus its apparently limited ventilation).  It's rated at 10HP;
> we'll assume that's continuous and not peak. It weighs somewhere close
> to 170lbs.
>
> In comparison, the 6.7" Advanced DC X91-4001 is also rated at 10HP
> continuous, and weighs less than 90lbs. Or looking at it the other way,
> a big 9" Advanced DC motor (FB1-4001) weighs 143lbs, and is rated at
> 28HP continuous.
>
> Also, if you want regenerative braking you'll need a controller that's
> designed to be used with a permanent magnet motor, and you won't find
> those off-the-shelf for full-size EVs.
>
> The difficulty of regenerative braking is an unfortunate downside to
> series-wound motors, but there are enough advantages to them
> (combination of high starting torque and smooth acceleration to high
> RPM) that you'll be basically on your own if you decide to go with
> shunt-wound or permag in a highway-speed 4-wheel vehicle.
>
>    --chris
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