On Sunday, 14 August 2016 01:34:56 UTC+1, Fredxxx wrote:
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.

1912 Riiiight.
So where are they nowadays?
A dead end invention.