On Nov 24, 6:57*pm, Bruce wrote:
On Wed, 24 Nov 2010 06:34:55 -0800 (PST), Joe





wrote:
On Nov 22, 6:19 pm, Bruce wrote:
On Mon, 22 Nov 2010 07:21:00 -0800 (PST), Joe

wrote:
On Nov 22, 5:10 am, Bruce wrote:
On Sun, 21 Nov 2010 22:49:30 -0600, CaveLamb
wrote:

One of the problems using the engine propeller to turn an alternator
is that the prop pitch is all wrong.

By 90 degrees, in fact.

It works though, witness the bloke I mentioned that had an alternator
belted to the propshaft.... just that it doesn't produce much power..

Cheers,

Brice

Why not use stone wheels too Bruce, since you are talking about stone
age tech? Using a belt drive and a big alternator is not going to
capture much energy anything.

Now directly couple a motor/generator that consists of a stator
winding employing a high pole count configuration, which allows for
high copper utilization (minimizing energy loss and cost), and a
hollow rotor upon which powerful rare earth permanent magnets are
mounted on the outer circumference coupled to a variable pitch prop
system and you can pump out some serious energy. The city buses that
are using these moters claim they capture 97% of the kinetic energy
developed while stopping.

You are comparing apples to oranges.

Joe

How does, as you say "high copper content" decrease costs?

Cheers,

Brice- Hide quoted text -

- Show quoted text -

According to UQM" The stator is affixed to an aluminum housing, which
contains mounting end bells and bearings. This allows the rotor to be
suspended within the stator. Commutation of the machine is
accomplished electronically by sensing the position of the rotor in
relation to the stator, and intelligently pulsing electrical energy
into the stator such that the electric field generated by the stator
interacts with the magnetic field of the rotor producing rotational
motion ( motor operation ). Conversely, the application of rotational
motion to the rotor by an external force results in the generation of
electrical power ( generator operation ). UQM machines can be
operated in either a forward or reverse direction of rotation and
either in motor or generator mode and can dynamically change from one
mode of operation to another in millisecond response time. The hollow
design of the rotor permits the packaging of other components such as
gears and electromechanical brakes in the interior of the machine.
These design features contribute to lower usage of copper and iron and
other materials generally (due to smaller package dimensions),
reducing manufacturing cost over those for conventional machines of
similar power. In addition, the utilization of neodymium-iron-boron
( NdFeB ) magnet material in a wide range of consumer devices, such as
cell phones, disk drives and medical devices, has dramatically
improved the availability, performance and price of this material,
allowing us to price our advanced motors and controls competitively
with lesser performing conventional motors which we believe will
accelerate the rate of commercialization of our technology."

Joe

But.... you stated "high copper utilization" and when I question it
you provide a quote that states "lower usage of copper" ???

Utilization:
*1. the act of using
*2. the state of having been made use of

Usage:
*1. the act of using

Cheers,

Brice- Hide quoted text -

- Show quoted text -

Ever hear of doing more with less?
Same thing.

let me quote
Utilization:
1. the act of using
2. the state of having been made use of

Usage:
1. the act of using


Joe