Induction Heating
Most recent answer: 02/29/2012
Q:
i have neodymium magnets of 300 farenait that are inside a cooper pipe that is open on top. The motor run at 3400 rpm
creating heat up to 300f
do the magnets get demagnetized.
watch video se i am talking about.
http://www.youtube.com/watch?v=NivItikx0AU&feature=relmfu
please reply if this works or not.
thanks
e.alexiou
- EFTHYMIOS ALEXIOU (age 52)
NEWTON
- EFTHYMIOS ALEXIOU (age 52)
NEWTON
A:
I'm puzzled about what the point of this device is. Almost 2kW of electrical power is drawn by that motor. It spins some magnets near a copper coil which is heated by the induction currents. That's a weird way to convert electrical power to heat, a task that any ordinary stove coil performs in a much simpler way.
Yes, as things get hot enough the magnets might lose a little magnetism, some of it irreversibly. You could directly measure that. As the copper heats up it gets less conductive, which reduces the eddy-current heating in it. That reduction of eddy currents must be the main factor giving the reduced power draw as things get hotter.
Mike W.
Yes, as things get hot enough the magnets might lose a little magnetism, some of it irreversibly. You could directly measure that. As the copper heats up it gets less conductive, which reduces the eddy-current heating in it. That reduction of eddy currents must be the main factor giving the reduced power draw as things get hotter.
Mike W.
(published on 02/29/2012)
Follow-Up #1: power through motor
Q:
Thank you for the answer . by the way the motor on video doesn't use 2kw it starts with 120v x 12.30amp = 1476 watts and it goes down to 9amp something.
Appreciate again for your reply
thanks again.
E.Alexiou
- EFTHYMIOS ALEXIOU (age 52)
NEWTON
- EFTHYMIOS ALEXIOU (age 52)
NEWTON
A:
We've corrected the power figure. Thanks,
Mike W.
Mike W.
(published on 03/02/2012)