On 13/08/2016 18:00, harry wrote:
On Saturday, 13 August 2016 15:21:15 UTC+1, Johnny B Good wrote:
On Sat, 13 Aug 2016 10:49:29 +0100, Syd Rumpo wrote:

In article ,
harry wrote:

There is no such thing as a DC motor.
I've told you before.

Yes there is. You are probably confusing something you read with
reality.

He's obviously oblivious to the concept of the homopolar motor, a true
DC electric motor so well described he-

https://en.wikipedia.org/wiki/Homopolar_motor

--
Johnny B Good

A laboratory device of little/no practical use.
There's one he-
https://www.youtube.com/watch?v=xbCN3EnYfWU
Doesn't it look useful?

I can't believe how ignorant you are, from:
https://en.wikipedia.org/wiki/Homopolar_motor
"B. G. Lamme described in 1912 a homopolar machine rated 2,000 kW, 260
V, 7,700 A and 1,200 rpm with 16 slip rings operating at a peripheral
velocity of 67 m/s. A unipolar generator rated 1,125 kW, 7.5 V 150,000
A, 514 rpm built in 1934 was installed in a U.S. steel mill for pipe
welding purposes."

If you think you can wriggle out of claiming a DC motor isn't a DC
motor, and then claim a unipolar device has no practical use you should
consider seeing your doctor or simply stop spouting your ignorance on
subjects you know nothing about.