Re: Is this servo usable for position control?

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

> grantfair2001 wrote:
>
> > I have 3 Japan Servo DC servomotors . . . If I count the tach

pulses can I

> > use this to establish positions reliably? And control this
> > position with the 24 volts DC supply?
>
> If the tach only has one channel, then you can't determine which way

the

> motor is going. If that is so, it is not suitable for positioning

use. Are

> these
> brush motors or brushless DC. If 2-wire brushless DC, then itwill

only turn

>
> one direction, so that is also useless for positioning

Well, it's a two wire DC motor. I see no sign of brushes on the
external housing, but it looks as if access to the inside is intended
at one end. But the black lead goes to ground on the control PCB, so
clearly, there was no plan to reverse it with the existing control
electronics. Is there an easy way to determine if it has brushes?

>(unless you never want to go back to where you started from).

Would that be a bug, or a feature? With some of my projects, a feature
I think <g> .

> Jon

Thanks very much for your reply.

Grant