microstepping motor control

[marco32]

Posted on September 02, 2004 at 05:14

microstepping motor control

[marco32]

Posted on August 31, 2004 at 05:17

I've build a hardware stepping motor control. It works, but it makes to much noise! Can it be solved by microstepping? How many steps would be great?

I know there's a motor control forum, but it seems a low response on it!

So Thats the reason i placed the question in the main ST7 forum

[jatin]

Posted on August 31, 2004 at 09:53

When you say hardware stepping motor control with too much noise does it mean full-stepping i suppose? The number of microsteps that can be taken by the rotor in a full-step in normally specified in the motor specs.

The microstepping also depends up on the phase difference between the two motor coils which decides the current levels required during each microstep e.g. 60 degrees or 90 degrees. Which stepper motor you are using?

[marco32]

Posted on August 31, 2004 at 12:11

The hardware control is full-stepping, right!

I use a 1.8 degree step angle, bipolair See attachment

________________

Attachments :

8073.pdf : https://st--c.eu10.content.force.com/sfc/dist/version/download/?oid=00Db0000000YtG6&ids=0680X000006I0DM&d=%2Fa%2F0X0000000bVY%2FLl3n1khOnXo5GxTMIXmzduotYvF_Mt6rQkCl3cIQcAA&asPdf=false

[peterharris9]

Posted on September 01, 2004 at 21:59

Hi Moppie

If you are using a simple circuit where the both common connections are connected to a supply and your micro is switching the four coils in turn like this:

1000

0100

0010

0001

you can easily implement half stepping in software like this:

1000

1100

0100

0110

0010

0011

0001

1001

Hope this is of some help

BM

[marco32]

Posted on September 02, 2004 at 05:14

I've implemented half stepping already with the control unit L297.

Yesterday i used another stepping motor, but with also a lot noise

Another question, i can't found any documentation about the speed.

When the speed of the stepping motor is 120rpm, the torque decrease!

I need 120rpm!