Re: Brushless DC motor repair...

Jon,

Thanks for the words of caution without undue alarm. The "timing"
sensors inside the motor were attached to the endbell, which is
located by the screws that extend through the motor. Can only be
assembled one way.

Hooked up the motor today, purrs like a ...

Nothing like the satisfaction of not having to send something "back
to the factory."

Thanks,

Patrick

--- In CAD_CAM_EDM_DRO@y..., Jon Elson <elson@p...> wrote:

> It will look more like an AC induction motor on the inside. There
will
> be permanent magnets in the rotor, and fixed windings in a
(probably)
> slotted stator. There will also be some tiny sensors inside the
> motor, unless the commutation is done with extra sensors in the
> encoder. If the encoder cannot be removed from the motor, you are
in
> for serious sweating! It only takes the slightest touch to shatter
the
> glass encoder disks. If the encoder can be removed, you need to
> be able to get the encoder aligned exactly with the rotor position,
> otherwise the commutation of the windings will happen at the wrong
> phase relative to the magnets in the rotor.
>
> The permanent magnets can make assembly very difficult, and will
also
> attract swarf. Some motors may lose some of their magnetism if the
> rotor is removed from the stator. They usually have a warning label
> if this will be a problem.
>
> Jon