Need Help!- Motor Controller

[victorprmt]

Hello
I have a GagetMaster steeper motor controller this controller is designed for 800mAmp steppers motors, please see that at: http://www.lightmachinery.com/motion-control.html my question is what do I need to run bigger steppers motors for example a 2 Amp steppers motors, with the same GagetMaster controller
Thanks
Victor

[vger]

You may be able to run the 2 amp motors with that control depending on the motor specs. You will not be able to drive them to 2 amps. To do that you will need a larger controller.

[victorprmt]

Hi
Can I use this circuit between the controller and motor?

[vger]

The print is too small to tell what kind of transistors you have in the circuit. The basic concept would work... if... the transistors will handle the power (voltage and current) and you put some fast recovery diodes across the emitter/collector of the transistors to stop the kickback coming from the coils in the motors from destroying the transistor. You will want diodes with a reverse voltage rating at least twice the operating voltage with a current rating of 3 amps or more. Inductive kickback voltages can be quite high when the transistor switches off. It will be a negative voltage spike that may be as much as 10 times the supply voltage. Transistors do not like to have a large reverse voltage across the emitter/collector and generally fuse into a small lump of silicon. You will probably be looking for transistors that are in a TO220 case with a power rating of 50 watts or better. Don't forget the heat sinks to disipate the heat they will generate.

Steve

[victorprmt]

Tanks Steve

The picture, which I copy, and paste from Internet is I think a 2n3904 transistor but for my application I need a bigger one. Now I have to follow your recommendations and calculate all the components I need, as you know I am a mechanic not an electronic guy so I need help for this, I am waiting for the stepper motor that come in and see the specifications

Can I contact you for further question and help me on the calculations?

Regards Victor

[Megahertz]

So, you are using a unipolar configuration. What is the purpose of the 2.2K ohm resistor in parrallel with the motor windings? In my opinion, the collector resistor should be replaced with a diode as stated earlier.

[victorprmt]

Hi Megahertz

Yes you are right must be T0220 and 4 amp diodes


Please check this website
http://www.azega.com/controlling-a-s...th-an-arduino/

part 1 and 2

[vger]

Victor,

Here is one possible slightly more elegant solution for you. Its a stepper driver IC made by Allegro Microsystems.
http://www.allegromicro.com/en/Produ...7024/97024.pdf
The one you would want is the SLA7026M. It's available from Newark for $6.20 each (you would want 3 of them)
http://www.newark.com/allegro-sanken...-ic/dp/95B3005

It has built in diodes to protect the FET output transistors and is a PWM style driver. It will require 2 power resistors (sense resistors) and a couple of other resistors to set the reference voltage to control the current. You could even use a resistor and a pot to make the current adjustable if you wanted.

Have you considered power supply yet? If you are running 3 steppers with 2 windings on in each stepper at once you will be looking at 12 amps maximum current draw.

Have a great day
Steve

[victorprmt]

Hi Steve

Looks pretty much better, will you please make a little drawing with the connection to the stepper and controller for me?
I would be very thankful
Regard Victor

[vger]

Running short of time and will be out of pocket till Monday. I'll try to draw something up for you then.

Steve

[bruced47]

Anybody interested in a 3 axis stepper driver designed to interface directly to MACH3 parallel port? If so, I'll put together a package with schematic, parts lists etc. It's a 2 sided PCB so it's not for the faint of heart DIY. I built it to run a home grown PCB drilling mill it will handle up to 3 amp steppers. My configuration runs at 600 pps using a 24 vdc @ 1.5 amps

[victorprmt]

thanks Steve