On 26/10/12 10:34, Alan Braggins wrote:
In article , harry wrote:

Tell us all how you can make a motor run on DC.

http://en.wikipedia.org/wiki/Homopolar_motor
Runs on DC. No commutator, no inverter. Not a lot of practical use,
but it works.

http://en.wikipedia.org/wiki/Railgun
Has practical use, and is at least arguably a kind of linear motor.
No commutator, no inverter. You put a DC pulse in, and get movement out....

:-)

However harry is MOSTLY right in that a so called 'DC' motor is in fact
an AC motor driven by a 'mechanical inverter'.

Oh and a DC pulse has an AC component :-) and 'motor' implies more or
less continuous movement which a railgun is NOT.



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