URGENT - I need a STRANGE Stepping Control Circuit

[The_JediKnight]

Hi every one!

I'm Mark and I'm new here.

I need to do a control circuit for a stepping motor, reverse & forward in order to pass the semester... but I'm stuck with the motor, a Mitsumi M49SP-1. The teacher gave it to me so I’m not allowed to use other motor.

Sincerely I can't figure out if it’s a unipolar or bipolar motor, the thing it's that has 4 wires - black brown orange and red,.

Reading around in some pages appear that 4 wires mean bipolar and other says that it’s unipolar so really I'm getting confuse .

In addition to that, in the data sheet of the motor says that it’s a 4 phase motor, but in the excitation method says that it’s a 2-2 Phase excitation and next to that says unipolar driving. … WTF?

So it’s a bipolar motor using unipolar circuit to be controlled?
Here’s other data of the motor:
• 4 ohms
• 7.5 step degree
• Rated current/ phase - 431mA/216mA
• Rated voltage – DC 12V -24V
• Working voltage - DC 10.8 -13.2V and DC 21.6 -26.4V

Now… the thing is that I need to design the control circuit for it, but it's not allowed using PIC’s or PC interfaces (the thing its turning a little bit difficult).

If you want to take a look at the bottom of this page (its in Spanish but the diagrams can be read in any language)

x-robotics.com/motorizacion.htm

It’s written that I can use a L293b (integrated H bridge) for bipolar or a ULN2003 (darlington config) for unipolar but as I said earlier I don’t know what kind of motor is this and also I don’t know how to do it.
The only thing that I know it’s that the final circuit should look like this

robotstorehk.com/motordrivers/images/motor-controller-1.jpg

THE FINAL DAY TO SHOW THE CIRCUIT IT’S NOVEMBER - 23th
So I’ll really really appreciate any help you could provide me.
Thanks to everyone!

[Khalid]

Yes u can contact www.pminmo.com . probably he will help u in this regard.

[unterhaus]

it's a two phase bipolar stepper motor. You have to drive it in bipolar mode, easy, no choices

[The_JediKnight]

Originally Posted by Khalid Yes u can contact www.pminmo.com . probably he will help u in this regard.

Thanks Khalid i forgot to mention that also i can't use PC intefaces but you info really helps!

[The_JediKnight]

Originally Posted by unterhaus it's a two phase bipolar stepper motor. You have to drive it in bipolar mode, easy, no choices

Unterhaus thanks for clearing that issue .. but now that i know that its a bipolar stepper.. can i use the last circuit of this page?

http://x-robotics.com/motorizacion.htm

If so what should I do in order to put a Variable Resistor and control the stepping forward and reverse move?

[Mariss Freimanis]

JediKnight,

Dude, you are making it all sound like it's a burden and imposition on you. You are taking a technical course and from that I surmise you have picked a technical major in school. If so, you should love what you have chosen and you should see your assignment as a happy and worthy challenge.

The salvation to your assignment is only 2 D-flops and a pair of XOR gates away. It is a throw-away easy solution. To get it though you must show me a willing eagerness to learn instead of seeing the assignment as a burden. Are you willing to have that attitude? If yes, contact me off-list. I design motor drives as my profession.

Mariss

[The_JediKnight]

sorry about sound like you said Mariss.

it's not an excuse but the thing is that i need to desing 4 more diferent projects for other teachers:



A) for one of those i'm allowed to use a PIC to control what ever I want

B) other it's control a speed, reverse and forward of DC motor wich use betwen 2 -6 A

C) using PIC's, CMOS, TTL or any thing ...i need to control an hydraulic circuit.

D) the 3rd is design a control mode using a Siemens PLC

and this one the stepper motor (forward and reverse)


so i'm getting a little bit crazy with all that stuff so I need to do it all at the same time at the easiest and cheapest way possible.

[Khalid]

Dear Mariss Freimanis;
I will b very happy if u can increase our knowledge.. Also consider me along with JedyKnight:0

[The_JediKnight]

I make this mod...



it's ok or i need to use a LB293b?

[NC Cams]

If the device is to be battery powered and the stepper on the same power buss as the power supply, use a LM2940 regulator IC instead of the 7805 - MUCH better performance with servo voltage induced spikes with the 2940 than 7805. Also "free" over voltage and reverse polarity protection.

[The_JediKnight]

Originally Posted by NC Cams If the device is to be battery powered and the stepper on the same power buss as the power supply, use a LM2940 regulator IC instead of the 7805 - MUCH better performance with servo voltage induced spikes with the 2940 than 7805. Also "free" over voltage and reverse polarity protection.

Hi NC cams..well actually i'm going to power it by a cell phone power supply or 110 plug wire

so at the end should look like this

[acondit]

Originally Posted by The_JediKnight I make this mod... it's ok or i need to use a LB293b?

If I understood you correctly, you said you have a 4-wire stepper motor. A six-wire (or an 8-wire) can be wired for use either unipolar or bipolar, however, (as Unterhaus said) a 4-wire motor can only be used bipolar. Therefore, you must use the LB293b to drive this motor.

Alan