from the Need all information department...
servo motors and absolute positioning
Motion control, servos, steppers, etc. topic
Posted by Herman Rooijakkers on 20 October, 2004 - 6:20 pm
Who can help me with finding training documents about the working principle of servo motors in combination with a absolute positioning encoder??

Posted by vanini on 25 October, 2004 - 5:52 pm
Maybe you'll find some information from the manufactures of servo motors. Try sanyo denki.

There is also open source project for these things like robotics and there is also some documentation.

Posted by Mark Underwood on 24 March, 2013 - 5:21 pm
FYI, they may have changed to if not already there.

>There is also open source project for
>these things like robotics and there is
>also some documentation.

Posted by Yuri Mitnick on 25 October, 2004 - 11:24 pm
Absolute encoder makes little (if any) sense for DC motor speed control. It is too expensive and incremental encoder or tacho will do the job.

Absolute encoder is good for position control applications with sinusoidal brushless servo motor that requires position initialization at power-up. However, it can be replaced by incremental encoder and a proper initialization (phase search) procedure - see, for example, the following threads with some references:


Posted by Leonid on 27 October, 2004 - 8:22 pm
Hi Herman,

I hope that "absolute position encoder" means modern high resolution interpolated sin/cos encoder with serial interface.

You may find asked info from encoder's producers (Stegmann, Netzer, Heidenhain) or IC producers (icHaus, Texas Instruments Analog devices). Pay attention that resolver, synchro and even potentiometer suit for above term.


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