Sorry, no hands on experience with Eteks, I am only going by what I have
heard from others. As far as efficiency goes I suppose they probably have
the upper hand, but I doubt enough so to make much of a difference in most
road going conversions. Perhaps in a streamliner or solar racer where all
of the other inefficiencies have already been worked out then it would make
enough of a difference to care.
damon
From: "Andrew Wowk" <[EMAIL PROTECTED]>
Reply-To: ElectricMotorcycles <[email protected]>
To: ElectricMotorcycles <[email protected]>
Subject: Re: [ElectricMotorcycles] NOOB question: Ranges
possible(feasible)on EM's
Date: Thu, 29 Mar 2007 12:21:56 -0600
damon henry <[EMAIL PROTECTED]> wrote:
Don't be enamored with the Etek motors. They are relatively expensive and
hard to find, and easy to damage from drawing too much current. There are
many other options available, although you do have to know somewhat what
you
are looking for. Just about any 6 - 7 inch industrial motor that is
series
wound for 24 to 48 volts DC and weighs between 60 - 100 lbs is a possible
candidate. It should have a shaft that you can get a sprocket on and you
might want to run it past Jim at [EMAIL PROTECTED], as he is
very knowledgeable and helpful. You might even want to start with him, as
he regularly gets motors this size going through his shop.
I am interested in knowing how you've found they relate in terms of
efficiency if you've used both. I agree that series wound motors are well
suited for EVs, especially if you can find one cheap. They are also more
robust, and have an excellent track record. The ADC motors in particular
have good support, and cheap-to-replace brushes (check
here<http://www.evparts.com/shopping/index.php?id=504>),
while the etek is out of production. They also produce more low-end torque,
making them great for heavy utility vehicles.
However, the pancake PM motors appear to be much more efficient,
particularly under high load. They appear to have a much flatter torque
curve, which is more desirable for maintaining speed. They are not only
lighter (every pound adds up), but also smaller. This allows for more
mounting options, possibly freeing up almost all of the engine cradle space
of a bike for batteries.
When considering how much time and money it takes to do a good conversion,
I
think the additional expense of an etek is well worth it.
Regards,
Andrew
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