Understanding the Concept and Characteristics of a Servomotor

Hello

Can someone answer a question I can't find online? What is a "servomotor" and what are its characteristics?

Search for "servomotor".

stepper motor:
http://sjp.pwn.pl/haslo.php?id=2575310
Regards .

A stepper motor is not a servomotor, although it can be a component of a servo ... The explanation from the link is also not complete.

SERVO, servomotor and other clones of this name describe a "motor with feedback", which is usually an electric motor with a gear, at the output of which there is an axis position sensor (potentiometer, optics, etc.)
In addition, there is the control electronics, because there is a position sensor, so our servo can be controlled so that it rotates by a certain angle, stays in this position, etc. At the same time, any attempt to mechanically change the position of the controlled servo will cause the motor to maintain its position.

An example of application is a model aircraft where the rudder repeats exactly the movements of the stick on the desktop, regardless of the load it will always deflect the same angle as the stick

But an ordinary squirrel cage motor with an encoder is not a servo motor. Modern servo motors are permanent magnet synchronous motors. The basic features of such motors are a small moment of inertia of the rotor and high resolution of the motor shaft position feedback system. How such engines are built and what are their parameters can be seen here:
http://www.boschrexroth-us.com/country_units/...mentation/LegacyProducts/Motors/index.jsp#MKD

noplis wrote:

But an ordinary squirrel cage motor with an encoder is not a servo motor. Modern servo motors are permanent magnet synchronous motors. The basic features of such motors are a small moment of inertia of the rotor and high resolution of the motor shaft position feedback system. How such engines are built and what are their parameters can be seen here:
http://www.boschrexroth-us.com/country_units/...mentation/LegacyProducts/Motors/index.jsp#MKD

Not true - a matter of scale. There are big servos and small servos. If you have such a need, you can even build a synchronous servo.
There are, for example, electrically controlled excavators, where several dozen kilowatt squirrel-cage motors are responsible for the arm movements. With the right tooling - they form a servo.
In addition to the motor, the servo may also include mechanical systems - e.g. gears and electronics.
And by the way - in model airplanes, it is not at all said that the servo has to correspond exactly to the movement of the stick Currently, it is easy to set how large the range of motion of the servomotors should be, and many for one channel. It can be proportional to the movement of the stick, but it doesn't have to be.

A servomotor is a device that makes something move.
And that's it, various devices can be a servomotor, e.g. a pneumatic actuator.

100%

So, generally speaking, any motor that can work with an encoder can be used to build a servo? so what does a servo with a separately excited motor look like?, does anyone have a diagram of such a system?

Thanks for the help so far, it cleared things up a bit for me

The servo is a combination of a motor, an encoder and an automaton that connects the encoder to the motor. As a colleague wrote above, it does not even have to be an electric motor, but most often they are because they are easy to control ...
And how to control it, figure it out yourself buddy. Google will give a lot to the question about the separately excited motor, also about the control. now hang an encoder, potentiometer or other shit on the axis of this motor, turn on the appropriate automation between the motor control and the position sensor and you have your servo
Regards