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Hi Epineh,

I work on a design similar to this one. I'm not very familiar with component selection and calculation. So, Would you mind to tell me the values of the surrounding components of your...

I don't remember when or where I got this but it might help you. Well I hope it will !!

Good luck

As I see, you haven't implemented the microstep mode yet.

Your program is easy to read that's nice. I'd be interested in your microstepping code once you've programmed it. Let us know.
...

Here is the C file I was talking about. I made a mistake, I wasn't planning to implement RS232 but I2C.

I hope you'll be able to do something with this. It's not complete and I cannot provide...

I already made something like that before with a PIC16F. I had accelaration ramp, decelaration ramp, min and max speed. My next step was to implement RS232. Once I'm back home tonight I'll post...

On the schematics these are NPN transistors. Why don't you use N channel fet instead of P ones? they are easier to control and cheaper to buy.

If your bipolar stepper has 4 wires, think of it has two separate wires going in and out of a box. When you try which wire goes with the other, you will try any possible combination.

Look at...

Thanks a lot Kiwichris and Kreutz. It's all clear now. I misunderstood the role of the PWM in a microstepping drive.

Thanks again

Nic

ok, I'll suppose I have the attached document as my driver. But replace the L297 by a PIC. The output will be a PWM in a sine-cosine pattern for microstepping. The PWM will drive the power stage...

Now I'm getting more and more lost !!!

Why would I have an analog reference voltage to control current ?? If I set the pot of the hardware chopper to a fixed level, the hardware chopper will...

What do you mean by "software controlled reference is the realistic option." ?

BTW, this is exactly what I thought that would happen using the PIC for current control. I'm glad to know I'm in the...

Let's assume I want to control the motor current using two PWM module of 16F737, read an analog input for current control, implement microstepping, control the incoming step pulse and generate the...

I didn't want to use the PWM to control current. I would have used it for the microstepping. I thought of using the analog comparator as a chopper circuit. It would have saved me a few ICs on my...

I planned to use the PIC16F685, should I leave the chopper apart and implement current control in the PIC ?

Well, At first, I thought I would be better doing current control with the PIC when I...

I gave a quick look at the OS22B in the Parker catalog and they state 1.5A in series and 2.8A in parallel.

I hope this will help

Nic

I think the 5% to 95% relates to the output of the IR2104. Even if you don't send any step command to the stepper, the current control will turn on and off the mosfets.

To keep the bootstrap...

Thank you a thousand times for all these precious informations.

I'll try it out with new caps and a low pass filter in the Rsense path.

I'll let you aware of the development.

Thanks...

BTW,

What are the differences between Tantalum and polypropylene ??

thanks

Thanks for the reply.

As the pdf says, it's a test schematics. The final goal will be to replace the L297 for a PIC16F685 and maybe implement microstepping in the future.

There's no RC...

Thanks Kreutz

I first tried 1N4002 with the IR2104 and this is exactly what I thought. I changed those for ES1D 1A 200V ultra fast (15nsec) diodes They have a reverse current of 5uA @ 25ºC. It...

On my side it's stalled.

At some motor speeds, The voltage of my bench power supply increaseto 16-18V. I use it to supply the 12v side of my board. The power source is a phoenix contact...

Hi,

Have a look at this

http://home.vrweb.de/~lotharstolz/stolz.de.be/icd/main.html

good luck

nic

Hi Spalm

First of all, nice design

I have some questions for you since I'm trying to design something that looks like your controller.

1- What is your supply voltage ? (VMOT)
2- Do you...

I made a quick search on the web for these part numbers and they seems to be rare or old parts. Is there any newer replacements for it ?
I've seen UF1002 through UF1007...

Hi all.

I just finished to mount IR2104 IRF540 and L297 on a prototyping to make some test on a board I'm designing.

I have a 2 QUINT 24v 10A power supply from Phoenix contact to supply the...

Tha capacitor voltage at a known amount of time is determined by the following equation:

Vc = Vcc * 1 - e^(-t/RC)
where:
Vc = instantanneous capacitor voltage
Vcc = Supply voltage or souce...

FP0 from matsushi_ta Electronic Works or, MEW --> the Panasonic industrial line try www.aromat.com

ELC from Cutler Hammer are great too. They are small, cheap, expandable and has a great...

Hi,

I don't know any PIC (16F, 17C, 18F and dsPIC) who has an analog output. An easy way to acheive this is a PWM output coupled to an external RC filter circuit to filter the PWM. It's a...

Thanks Aaron,

I won't worry about it anymore

thanks again

nic

you need to turn off comparator module beacause after a chip reset, the comparator inputs are analog and you won't be able to write on these pins.

this is why: CMCON = 0x07; // turn off...