RE: [CAD_CAM_EDM_DRO] Servo Motor Make Up?

Hi John

I can give you my definitions FWIW.

A servo motor is any prime mover that is designed to be
used with a position or velocity feedback device.

It does not have to be a DC motor or even an electrical
motor!

That being said I can also give you a
set of characteristics that are typical of an electrical
servo motor as used with machine tools:

1)It often has much lower inertia than a regular motor

2) It usually is designed to operate at a variety of speeds and
is bi-directional

3) It has smoother torque characteristics (less cogging)


I will also anticipate the question "Can an ordinary PMDC motor

be used with an encoder as a servo?"

The answer is yes.

Les

-----Original Message-----
From: John Delaney [mailto:jdelaney2@...]
Sent: Sunday, June 13, 2004 6:55 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Servo Motor Make Up?


I've been sloggin' through the archives back to Jan '04, so far.
Things are getting repetitive but I can't find a simple statement on
this.

Is a servo motor simply a "normal" DC motor with an encoder?

If not can anyone refer me to a source of information on them?

Please advise. Thanks in advance, as always.

-jd



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