[Tutor] Python serial interface

[Colin Ross]

Thank you Francois, this gives me a lot to think about!

I really appreciate your feedback.

Colin

On Wed, Apr 1, 2015 at 12:50 PM, Francois Dion <francois.dion at gmail.com>
wrote:

> On Wed, Apr 1, 2015 at 11:01 AM, Colin Ross <colin.ross.dal at gmail.com>
> wrote:
>
>> Hi Francois,
>>
>> Thank you for the fast reply! I am looking to control a brushless servo
>> motor (
>> http://www.aerotech.com/product-catalog/motors/rotary-motors/bms-series.aspx)
>> that drives a rotary stage.
>>
>
> These motors are not controlled by serial, you'll need a brushless
> controller. In turn the controller might be or not serial, or ip or
> something else altogether (PWM is typical). They do have an rs-422
> connection, but that is for a feedback signal. So you are building a
> feedback control system. If you google that and python you'll find several
> useful references, including a design and analysis module (but not control):
>
> https://pypi.python.org/pypi/control/0.6.6
> http://sourceforge.net/projects/python-control/
>
> Nothing out of the box for your application, obviously. Also, the motor
> control itself will depend on the microprocessor hardware you are using and
> the motor controller. Assuming PWM, the raspberry pi has a software PWM
> module in Python. Same with micropython. Anything else is pretty much DIY.
>
> As for the overall concept of control systems, Chapter 9 of "Real World
> Instrumentation" ( http://shop.oreilly.com/product/9780596809577.do )
> will give you an overview of what is involved (with some python example,
> but not directly applicable to your system).
>
> Francois
> --
> raspberry-python.blogspot.com - www.pyptug.org - www.3DFutureTech.info
> <http://www.3dfuturetech.info/> - @f_dion
>