--On Tuesday, August 19, 2008 7:57 AM -0700 Peter Parrish <[EMAIL PROTECTED]> 
wrote:

Any motor will need both a voltage and current to operate properly, and they 
tend to draw more and more current as the source (inverter) voltage drops.


Back to basic physics:

Depending on design, electric motors can be constant power or constant torque 
(or some combination of two) devices.

Three phase AC motors are generally simpler in design and better behaved than 
either either single phase AC motors or DC motors.  Permanent magnet 
synchronous 3Ø AC motors (available now) closely approach the theoretical 
limits of electromechanical motor systems in general.

Modern power electronics and control systems give us essentially perfect 
control of voltage, current, and frequency in AC systems.

Intelligently combining the above allows us to design efficient 
electromechanical systems which match nearly any complex supply impedance.  
These systems also happen to live longer, fail less often, and reduce both 
battery bank and inverter requirements.

The market (arguably free on so many levels, and obviously not on so many 
others) can address this using current technology.   System sizing math not has 
changed fundamentally in several decades but we are getting closer to those 
fundamental limits.

Industrial systems are a bit ahead of the consumer market in some areas but behind in 
others.  As one very basic example, Turbocor's maglev compressor has created a few 
waves in the commercial and light industrial sector but I fully expect some 
fascinating trickle-down benefits over next few years 
<http://www.turbocor.com/products_technology/>







.


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