Re: Who Killed the Electric Car?

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Article #1786

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#1786

From: Tim Williams
Date: Mon, 19 May 2008 04:47

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"kevin93" <kevin@whitedigs.com> wrote in message
news:0056c191-852e-402f-aff5-dded1e42e17f@z24g2000prf.googlegroups.com...
> On May 18, 3:00 pm, "Tim Williams" <tmoran...@charter.net> wrote:
> > Do they use permanent magnet, electric field or AC (induction) motors?
                ^ ^ ^ ^ ^ ^ ^ ^

> They are permanent magnet AC synchronous 3-phase motors - so they
> don't need excitation.

Ok, then that's included in my list (maybe not explicitly).  Permanent
magnet you just strap on a rectifier and boost converter, but you have the
weight of the magnets to contend with, which I've got to imagine is quite
substantial in the many-HP range.  Or are these magnetized cage rotors, so,
er, semi-synchronous I suppose might be a way to put it.  (Full magnetized
rotor is synchronous, nonmagnetized "squirrel cage" rotor (which I was
thinking of with "AC (induction) motor") is the regular deal.)

> They are not set into reverse to regenerate though, the PWM duty-cycle
> is controlled to give boost so that current flows into the battery
> rather than out.

Alright, which is like what I went on to say, but AC?

God, that must be awful, you need to run a VFD in reverse.  So to suck
power from it, you need to synchronize the rate with the shaft?  Minus the
difference which is power drawn of course.

I suppose it's no BFD if you have a bidirectional (power in/out) self
contained VFD controller inside a feedback loop that's controlled by the
gas/brake pedals to make it feed power out of or into the battery, but
that's an awful lot of trouble.  I'd just as soon go for a frickin DC
motor, but maybe it's not as efficient.

Tim

--
Deep Fryer: A very philosophical monk.
Website @ http://webpages.charter.net/dawill/tmoranwms

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From: "Tim Williams" <tmoranwms@charter.net>
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Subject: Re: Who Killed the Electric Car?
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