Re: (ET) (Fwd) Re: Ariens AMP Mower]

[RJ Kanary <rjkanary nauticom net>]

But THIS is what I sent.

There was a Steiner dealer not far from here. He went belly up halfway 
through his first season. :(

RJ

David Haas wrote:
I don't know much about the New ariens amp mower, but I have a sneaking 
suspicion that they have much bigger plans for this little toy.  I would 
bet its just a proving ground for bigger things to come. A little 
history, back in 2006 Ariens bought a little company called Steiner.Now 
if you marry this new ET AMP after its prov en, with the Steiner prov en 
technology you Have a new ET with every attachment you little hart 
desires . I have had many Steiner's over the years and can tell you its 
the best little 4 wheel drive garden tractor you would ever want to 
own.I was even toying with retrofitting an old Steiner frame with a old 
EV motor. Just adding my 2 cents  (that's a penny and a half Canadian)
Dave

--- On Thu, 5/14/09, RJ Kanary <rjkanary nauticom net> wrote:


From: RJ Kanary <rjkanary nauticom net>
Subject: Re: (ET) (Fwd) Re: Ariens AMP Mower
To: kmuldrew ucalgary ca
Cc: elec-trak cosmos phy tufts edu
Date: Thursday, May 14, 2009, 4:09 PM


If someone can dig up more particulars, I'd love to see them. :)

  And it REALLY makes me wonder why this project was saddled with a power 
robbing hydrostat.But again, I'm not an engineer, nor do 
I.............................


RJ

Ken Muldrew wrote: 
On 14 May 2009 at 11:28, David Roden wrote:

 
However, an electronic motor controller is effectively a continuously 
variable transmission without the inefficiency of hydro drive.  The
   cost
 
of 
a small DC motor controller adequate for a garden tractor is certainly
not 
prohibitive, and much less today than it was 30-35 years ago.
   Unless I'm misunderstanding the product description, the Ariens mower 
uses
a brushless DC motor (a three phase armature with permanent magnets on the
rotor and hall sensors for sequencing). It can't run without a controller
so variable speed and reversing are available at the outset with no 
significant additional cost. The torque vs. speed trade-off could be 
managed through dual windings in the armature or switching from WYE to 
DELTA configurations, but given the limited needs of a riding lawnmower, 
even this seems unecessary. I don't understand why the hydrostat is
there.

Ken Muldrew. 
  \----------------------------+----------------------------+   o_,
O_/ \    Ken Muldrew, PhD      | Voice: (403) 220-5976      |   <\__/7
<\__  \  Dept. of Cell Biology | Fax:   (403) 270-0617      |     | /
 "\ L  | University of Calgary | kmuldrew ucalgary ca       |   / /
  <    +-----------------------+----------------------------+ / /
              Morning coffee recapitulate phylogeny          L/


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