Re: Magnetic Motor
On Thu, 27 Sep 2007 01:36:57 -0700, recips@xxxxxxxxx wrote:
Is it possible to make a motor out of permanent magnets only? ie use
the stored energy of the magnets which presumably would lose their
magnetism as power is drawn. The motor would need a kick star of
course. Or would the motor only do 1 revolution.
Possible but useless. Certain magnets need "keepers" to maintain their
magnetism, and lose a lot of it if allowed to run "open circuit",
namely with a large air gap. So that makes possible a magnetic circuit
that's not mechanically conservative, namely mechanically asymmetric.
So the "excess" magnetism of magnets like that might be extractable
somehow. But the output would be tiny, and would be extracted in a
short time.
Of course, you can build a motor based on simple magnetic attraction,
which will run for a short while...
fixed string
/////-----NmagnetS NmagnetS---------------->
Wrap string around a shaft, sit back, enjoy.
John
.
Relevant Pages
- Re: rotating magnetic field
... |> where the flux lines are rotating. ... In this case the magnets are ... The flux lines in this case are rotating around the rotor axis. ... That's not how a normal induction or syncronous motor is constructed. ...
(sci.physics.electromag) - Re: rotating magnetic field
... |> where the flux lines are rotating. ... The flux lines in this case are rotating around the rotor axis. ... then there is no difference between the travelling wave produced by the magnets and the 3 phase winding. ... One such is just a few feet from where you are at present- go look at your kWh meter which is such a motor- the principles of operation are the same as those for any other induction motor. ...
(sci.physics.electromag) - Re: Is it possible to use permanent magnets to assist a motors power efficiency?
... PPMT motor is also a generator if driven with a mechanical input. ... provide flux control of the permanent magnets, which add their own flux to ... Using field coils to steer a permanent magnets flux across a rotor whilst ... If you look at the whole energy balance any mechanical energy output is due to electrical energy input - the permanent magnets provide no net energy to the process. ...
(sci.physics.electromag) - Re: Does a magnet grow less magnetic over time?
... that his group has built two different working magnetic motor designs, ... In permanent magnets is stored the energy but it is not ...
(sci.physics.electromag) - Re: Stepper Motor Behaviour
... loss for an explanation of how it might be able to do this. ... When commanded to continuously step, in one direction only, the motor ... by the permanent magnets) along with it. ... behind the rotor so it jumps back into alignment (slips a magnetic cog). ...
(sci.engr.control) |
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