servomotor control

To control the speed of what?

You must give more detail... I have built small servos for radio controlled cars..I suspect you are talking on a more industrial scale.

Give as much information as possible and you will receive useful answers.

Del

My project in for a control of supply of small pieces for what I want very low speed but very precise maybe with motor step but controlled.

Greetings

Do you really want to control speed, or do you actually want to control position of each item at a certain point in the process?

For low speed, either use stepper motors or servos with high gear ratios.

You really need to tell a bit more on your application, many types of motors can be used for speed and position control.

The key aspects are:

Power: Depending on the size you need, the motor and controller solution could be quite different.

Accuracy: Your speed and position accuracy will determine what kind of feedback you need, if any at all. This could be an encoder (optical or other), a stepper may or may not need one but a servo, brushed or brushless DC would need an encoder. The pulse per revolution of an encoder has great effect on its price, but is not the only parameter for high accuracy applications.

Interface: To what type of equipment do you intend to connect the controller. PC, PLC, microcontroller, stand alone, buttons...

Environment: Where is it running? Humidity/water, dust, temperature...

Your goal: To use a plug and play rugged controller with high level language, a board level controller or a component set to integrate in your electronics board will require different amounts of effort and skill.

Some motors come integrated with the encoder and control electronics, but then you may need to place your feedback closer to the process you want to control.

I work mainly with small motors and I have had great experiences with products from Allmotion if you need simple integrated control of small motors.

For a bit higher performance and power, Applied Motion Products have an excellent product line with dummy drivers to fully programmable controllers.

For higher end I would recommend Elmo, Galil, or if you want a bit more involvement and flexibility, DeltaTau is renowned.

For chip level, Allegro makes nice parts, but there are many, many choices out there.

But then, all this is useless before you define your application thoroughly.

visit www.paralax.xom they have great code samples of servo motor control. You might have to purchase their hardware in order to control servos with using their code but I considered it in a good investment

If you go to the Omron website there are some examples of applications in their catalogs look under the category "Servos". All industrial type applications.

http://www.omron.ca/

WHY DOES IT HAVE TO BE A SERVO MOTOR? USE AN AC MOTOR WITH AN INVERTER AND BE DONE WITH IT. BOB VILLEGAS WWW.ALLIEDMACHINERYGROUP.COM

its not difficult issue. we can do it for you at all.

control voltage either by duty cycle or level. ofcuse you can congtrol megnatice as well.