Chen Xiao Fan wrote:

>More than 12 years ago I was taught that DC motor drive was dying and
>would be dead soon. And indeed I no longer find any paper describing
>DC motor drive in major IEEE journals (IEEE Transactions on Industry
>Automation, Power Electronics and Industrial Electronics) after that.
>
>Now I hear that people are using DC motor to replace AC motors. 
>Interesting world. 
>
>Yes the DC motor drive is much easier than AC motors.
>
>Regards,
>Xiaofan
>
>  
>

Many people still use DC in their electric vehicle conversions because
less silicon is necessary (cheaper controller) and high power series
motors are easier to come by than 3-phase AC.

Here is a DC motor controller that does 2000 amps at 400v:
<www.cafeelectric.com>

As a side note, this is a battery charger that can put out 50 amps at 450v:
<http://www.manzanitamicro.com/chargers3.htm>
In PFC-boosted topology!

-- 
Martin Klingensmith
http://wwia.org/
http://nnytech.net/

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