How does a linear motor work?

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Offline Don_1

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How does a linear motor work?
« on: 29/08/2008 13:10:40 »
Does anyone recall a trial of a linear induction train in the late 60's early 70's? It had no motor, but was pushed along at speeds of up to 360 mph by the traverse of electricity along a single rail. The electrostatic field between the rail and the train made the train 'hover' above the rail. If you do, have you any idea what became of it? I seem to recall it being shown on an edition of 'Tomorrows World' many many moons ago.
« Last Edit: 05/09/2008 09:09:23 by chris »
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Offline peppercorn

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Re: How does a linear motor work?
« Reply #1 on: 29/08/2008 13:58:09 »
Is this not the same as MAGLEV trains like the 'bullet' train in Japan?

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Offline Don_1

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Re: How does a linear motor work?
« Reply #2 on: 29/08/2008 15:32:57 »
Yes, this is the the chappie, but what ever happened to it here in the UK where I think it was invented? Why did we never develop the concept. Or did we? It couldn't have been the 'wet leaves on the line' excuse, could it?
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Offline RD

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Re: How does a linear motor work?
« Reply #3 on: 29/08/2008 17:34:48 »
"Bullet" speed trains couldn't run on the UK's existing rail network: they don't do bends.
Tilting trains are a solution of increasing train speed on bendy track.




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Offline LeeE

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Re: How does a linear motor work?
« Reply #4 on: 30/08/2008 13:58:14 »
The 'Bullet train' is a direct english translation of the early project name for the Shinkansen, which run on conventional standard-gauge railways, although as RD points out, they don't do tight radius curves.  The Shinkansen has now been extended to include MagLev trains.

http://en.wikipedia.org/wiki/Shinkansen
http://en.wikipedia.org/wiki/Maglev_train
...And its claws are as big as cups, and for some reason it's got a tremendous fear of stamps! And Mrs Doyle was telling me it's got magnets on its tail, so if you're made out of metal it can attach itself to you! And instead of a mouth it's got four arses!

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Offline teragram

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Re: How does a linear motor work?
« Reply #5 on: 31/08/2008 12:11:29 »
The phrase "Linear Induction" may be the key to this question. Eric Laithewaite,(a genius, sadly of little public regard in the U.K.) at I think Manchester (U.K) University realised that if the field arrangement in an ordinary 3phase motor was "unrolled" it could operate as a linear motor. The rotating part of the motor would be replaced by a straight aluminium bar, along the centre of a pair of rails. This arrangement was proved to work. An extension of the idea was that the vehicle containing the linear motor could be made to hover because of the effect of the magnetic fields. As usual, U.K. attempts to translate the ideas into reality were less than half-hearted. The passenger link at Birmingham International Airport was originally a "MagLev" sustem, but was never successful, eventually being replaced by I think a conventional monorail. The idea has now been adopted   by the Japanese and Germans.  

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Offline Pumblechook

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Re: How does a linear motor work?
« Reply #6 on: 31/08/2008 12:59:21 »
Eric and gyroscopes makes interesting reading.

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Offline teragram

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Re: How does a linear motor work?
« Reply #7 on: 01/09/2008 13:11:49 »
And how, Pumblechook!!

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lyner

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Re: How does a linear motor work?
« Reply #8 on: 02/09/2008 09:25:59 »
It was a shame. If another, 'legit' Scientist had been prepared to talk to him about the question, he would have seen where his Maths was dodgy and been able to move on without being drummed out of the system. He constantly claimed that he needed help with the Maths which was "too hard" for him.