Re: Selecting a DC motor for Servo Motor Use.

How can one check for this timing effect you are talking about. Is
there are way to measure it either statically or electrically?








--- In CAD_CAM_EDM_DRO@yahoogroups.com, "John Hebel" <jfhebel@c...>
wrote:

>
>
> One factor in CNC type Servo Motor selection is brush timing.
> If the motor being converted was intended by the manufacture
> to run fast in one direction the brushes may be advanced.(Advanced
> means the brushs are rotated some number of degrees against the
> direction of rotation of the armature.)
>
> Advancing brushes improves efficiency and reduces sparking at the
> brushes.
>
> For a Servo Motor in CNC application it would be important for the
> motor brushes to be set for netural timing. That way the motor

would

> be equally efficient running CW or CCW (but at somewhat reduced
> efficiency).
>
> Some DC motors have adjustable end cases that carry the brush
> assembly. This means it may be easy to rotate the brush assembly

to

> adjust the brushs for netural timming.
>
> This may be a feature to look for in selecting a DC Motor for

Servo

> Motor useage.