Discussion in "8051 Discussion Forum" started by    zen bEaR    Oct 23, 2007.
Tue Oct 23 2007, 09:16 AM
hi guys.. this post isnt exactly about microcontrollers but is a bit relavent....
i'm trying to control a stepper motor for my project using the 8051.. my requirement is that the motor have a minimum speed of 10 revolutions per second with a stepping angle of 3 degree or less..
I went to sp road ( in bangalore) and got myself a 2nd hand stepper motor..its unipolar, with 5 wires...one is given to supply and the others grounded as required to step it.

while running the motor(i'm using the pc's parallel port for now) i cannot give a delay of more than 3 ms between steps. if i reduce it, the motor gets stuck and only oscillates a bit. with 3ms delay between each stepping sequence, i'm getting only 1.3 revs/sec.
How do i increase the speed of the stepper motor?

ps:thanks for being patient and reading through the entire post..it got lengthier than i intended it it be

Tue Oct 23 2007, 09:29 AM
i'm sorry, i meant- i cannot give a delay of LESS than 3 ms-
Tue Oct 23 2007, 09:44 AM
hmm... are you using a full step sequence of half step sequence? if you take a look at the tutorial of stepper motor its explained that in half step sequence the step angle reduces to half and so take more time.. so i want to know are you using full step or half step..
Tue Oct 23 2007, 11:50 AM
i think i'm using full stepping..
the sequence i give is :

and so on
btw, anyone here knows how to use cd rom motors? is it possible to use them? are they really stepper motors?
Tue Oct 23 2007, 03:12 PM
yeah u can use them.. just you need to find out the wires thats all rest everything is same as normal stepper motor
Tue Oct 23 2007, 10:51 PM
exactly... there are about 15 leads. i have no idea which is what..
i have come across people controlling a floppy drives motor using the ide connector at the back of the drive. one paticular pin conrols the speed and another the direction.. is it possible to do this with a cd rom drive??
please help!!!!
Wed Oct 24 2007, 07:51 AM
we need specifications of the motor.. then ofcouse we can do it..
I will try to search in google if i get any information about the motor.. you also try to search if you can find any helpful information about the motor leads and other specification.. even in general information is acceptable.. so just look for whatever infomation you can get..

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