Need Help!- what resistor to use for steppers

[shawnc515]

could somone please tell me what kind and where to get resistors for these stepper motors (the 305oz model) http://www.hobbycnc.com/products/stepper-motors/
i will be using two of them each with it's own resistorand one more thing why does stepcalc say that for a 3amp step motor i need a 6amp power suply thank!!!

[shawnc515]

sorry about my bad spelling

[shawnc515]

o the power suply will be 32 volts

[jalessi]

Shawn,

Do you have a Hobby CNC Driver Board?

If so you do not need resistors for the stepper motors.

There are adjustable potentiometers on the Hobby CNC board that you set for the current rating of your stepper.

Are you using two or more stepper motors, if you are that is the reason for a 6 amp supply.

It is possible for all motors to be active at the same time, when additional motors are active the current demands are greater.

A six amp supply for a pair of three amp steppers is a little overkill however it cant hurt.

Jeff Alessi

[shawnc515]

no i am not using the hobby cnc bord and stepcalc says 6amp for one mtor

[shawnc515]

i would post a screen shot of step calc but my laptop is down do to power suply problem

[jalessi]

Shawn,


What type of driver are you going to use?

Gecko drives require 2/3 of one phase rating for each motor. (3 amps x 2/3) x 2motors = 3.96 amps maximum

Jeff...

[jalessi]

http://www.geckodrive.com/photos/Step_motor_basics.pdf

[shawnc515]

here is the drive that i use http://dtllc.com/4xcnc10b.html what i want to know is if i run the steppers at 32volts and there rated 4.2volts 3amps then what size resistor do i need and where can i get it (sorry to be such a pain)

[shawnc515]

one resistor per stepper

[jalessi]

9.2 Ohms

18.133 Watts round up to 20 Watts

Shawn,

You can call Delagrange

260) 456-4208

He is probably home, double check my calculations.

You may need non inductive resistors!

Jeff...

[shawnc515]

thanks alot i have been driving myself crazy trying to figure that one out thanks agen!!!!!!!!!!!!!!!!!!