Re: The recoil of a dc motor at start-up
- From: nospam@xxxxxxxxxxxxxxxx (J. J. Lodder)
- Date: Sun, 2 Sep 2007 18:41:50 +0000 (UTC)
guille2306 <guille2306@xxxxxxxxx> wrote:
On Aug 25, 4:30 pm, nos...@xxxxxxxxxxxxxxxx (J. J. Lodder) wrote:[massive snippage]
Tareq <tareq....@xxxxxxxxx> wrote:
The numbers of up and down spins here differ in the direction of the
magnetic field of the stator. The magnetic field of the rotor which
acts by the force on the stator is in a direction orthogonal to
magnetic field of the stator. Are the numbers of up and down spins
different along any arbitrary direction ??
Yes, excepting only the plane perpendicular to the magnetisation,
But that's not the reason why the DC motor works. In a DC motor the
stator and rotor fields are parallel each other, at least at one point
of the turn (if the stator is a dipole). Actually it would work even
if all the moments in the stator pointed in the same direction, the
component of the rotor field in that direction and its inertia make
the rest.
There is not much need to explain why it works:
that is just Lorentz force on a conductor in a magnetic field.
The OP asked the oposite question:
How can there be a reaction force on the permanent magnet.
The answer has already been given:
There is a net force on magnetic dipoles
in an inhomogeneous field.
Best,
Jan
.
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