Re: [CAD_CAM_EDM_DRO] B: Brushless motor

> Why? Is it against the law to use brush motors there? Why does it have

to

> be brushless? The only reason I can think of is for operation above, say,
> 40,000 RPM. As for controllers, unless you need variable speed under
> computer control, an adjustable DC power supply will probably work.
> A variac, transformer, rectifier and capacitor will vary the speed with

only

> slight response to line voltage variations, for this purpose.

I prefer a brushless motor for several resons.

1) I already burned 2 brush motors, and I hear brushless are more stirdy.
2) I hope a brushless will make less noise
3) A brushless motor will run fast and slow with equal strength

I brushless motor works more or less like a stepper. The idea is to have the
coils fixed around a magtnetic core, so there's no physical contact between
the core and the power supply. This takes away some of the noise, and allows
for faster speeds, because there won't be a 'lighting' around the contacts
where the coal touch the cobber on a brush motor.

For the same reson - the fixed coils - the motor needs a controller, just
applying DC will hold it, like a stepper - not make it turn.

--Michael