Stteper Motor Thecnical Information.

[amirfarzad]

I need some thecnical information about stepper motors (in general or particullar!!)?
Also if anybody knows haw ECU can compensate the required Voltage for an steeper motor with manual throttle body?

 

[MacGyverS2000]

Stepper motors are cool (in general), and really cool to use (in particular). How about a specific question about steppers?

Dan - Owner

http://www.Hi-TecDesigns.com

 

[whitehendrix]

right..lol

stepper motor technical info.. Hmmm..

lots of it, man..

whats the application? you'll need to see how many degrees per pulse the thing rotates, or "steps". (thus the name)

some of them step fractions of a degee, some step 1 or 4 or 7.5 degrees..

the output torque and rotational speed are also of a concern, but rotational speed is also dictated by the PWM feeding the stator. (as is torque, basically..)

as well as the voltage, of course. also, you must pick a design voltage..

will this be an encoder-based closed loop control, or be open loop with TPS feedback?

whats the input control going to be to tell it when to open and close?


the ECU.. this has to have the capability to drive an inductive motor load at a variable frequency without faulting out. most ECU's are not designed to do this, save the ones for use on fly-by-wire systems.

sounds like your wish is to make your own fly-by-wire system?

the only thing i can think to do is to build a stand-alone stepper drive and utilize the input (assuming you'd use a simple potentiometer to feed the drive unit) alone to drive it. the TPS would tell the ECU what to do from there... BUT, you'll have 2 separate contol systems to run the engine and would also have to have some sort of fail-safe incorporated.. God forbid that motor drive lets go when you're at W.O.T.

 

[MikeHalloran]

Amir, the first thing you need to understand about steppers is that they're digital, i.e., you don't vary their speed with voltage, you vary it by changing the frequency at which their windings are switched on and off.

Even a simple, slow microcontroller, like a Basic Stamp, is fast enough and smart enough to make them do some interesting tricks. I suggest you rig one up and mess with it for a while.

I also suggest that you don't consider connecting a stepper to an engine's throttle for a very long time. You'll know when you are ready.



Mike Halloran
Pembroke Pines, FL, USA