Re: [CAD_CAM_EDM_DRO] servo control

Binoy Shenoy wrote:

>I am talking about keeping the motor fixed in a certain position so that it does not move. This is when it is not in motion.
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What I gave you is the real answer. There is generally no brake, lock or
other contrivance to hold position. The servo drive is commanded to
maintain zero velocity, and that is updated with minute changes as the
axis may drift slowly. That drift is picked up by the CNC control
(or servo driver) by way of the encoder, and causes a correcting
response from the servo amp.

Some early CNC machines where only one axis could move at a time
needed axis clamps to hold the axes that were not currently driven.
Some robots use brakes to reduce the load on the motors and amps
when holding the arm out straight for long periods.

In the most general sense, a servo drive makes no distinction between
holding position and moving. They do the same things, just that the
commanded velocity is zero.

Jon