Re: Selecting a DC motor for Servo Motor Use...How to Check Neutral Timing.

To adjust for neutral timing requires a dc voltage source and an ammeter. Assuming the motor in question is built to allow adjustment of the angular relation of the brushes in respect to the field permanent magnets THEN put a dc voltage that is a small part of the maximum rated voltage. The ammeter is connected in series with the motor. The motor shaft is not loaded with any machinery etc., it is free running. Rotate the brushes slightly one way and then the other. Note the brush position that causes the motor to draw the least current. This is the position of neutral timing. The motor will run
equally well in each direction.

A way to know that a motor is not built with neutral timing can be checked by running the motor with low voltage and with no load. Measure the current with the power at one polarity and the repeat for the other polarity. If the currents are NOT the same the motor is NOT timed for neutral running.

Beware that running a motor under load with retarded timing will shorten the brush life, wear away the commutator, and heat the motor.




--- In CAD_CAM_EDM_DRO@yahoogroups.com, "lcdpublishing"
<lcdpublishing@y...> wrote:

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