How to contol speed of DC motor with PWM

[avisenna]

I have project to build centrifuge with motor dc, but i have problem with speed control with PWM. I need max 3000 rpm and i use encoder for to know how many rotation and position. But i don't how to integrated with microcontroller. Can I use PWM chip?

Please reply to me dee2jee@yahoo.com
thank's
Didi DJ

 

[Madcow]

Just about every microcontroller or dsp manufacturer
has an app. note on motor control. Pick a micro that your
comfortable with. I like TI or Microchip.Most have built in
PWM's.

http://www.microchip.com/1010/suppdoc/appnote/func/index.htm

 

[avisenna]

But in this project i use ATMEL 2051 for controller, why ? because is very cheap mC. i use 3000 rpm in 10 minutes. First step is to check every cyletime increasing speed but still dont understand how to implementing that to assembly program

 

[Madcow]

You most likely want to use a PID or PI loop.
Tons of info. on the net or searh some of the
threads hear. One that might help is
thread237-7604

A good 8051 site is

http://www.8052.com

These may also help.

http://server2044.virtualave.net/stephensin123/motor/27062201.pdf

http://www.control.com/1026160221/index_html

 

[jbartos]

Suggestion: Visit

http://www.solorb.com/elect/solarcirc/pwm1/

http://www.allegromicro.com/selguide/newprod.asp

etc. for more info

 

[Nandos]

Yes, you can use a PWM controller to run the motor at a set RPM and you could make everything analog.

What is the RPM accuracy you need to attain ?.
Question what is the power of the motor and the voltage.

How many are you going to build ?.
If you need more info let me know.

Nandos