On 12/11/2013 09:40 AM, Dave Cole wrote:
... snip
> Siemens had hybrid motors that were not
> standard induction motors at the time that could do better positioning
> but they were as expensive ore more expensive than other companies servo
> drive systems and were generally only used for very large HP/torque
> applications that required some level of positioning at high power
> levels.    Think big $$.
>
> Dave

Speaking of getting creative with induction motors, I found this 
recently. It may be of interest.
http://powerelectronics.com/power-management/how-run-split-phase-induction-motor-three-phase-inverter


-- 
Kirk Wallace
http://www.wallacecompany.com/machine_shop/
http://www.wallacecompany.com/E45/

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