Powering 3 45Ncm Nema 17 Stepper Motor 2A 4-wire (not CNC)

[Fivetide]

Neale, my understanding is fivetide wants the 3 motors to run from a single driver..

That's true .. I would like to manually vary the speed of all three motors simultaneously. Toque maybe a factor in the future
There are 40A versions of the Motor controllers for not much money. My understanding of power supply is limited, if I attach 3 motors that draw 2A's each onto a 40A supply will the motors only draw 2A's of the 40 or will the power supply push 13A's to each motor.. ?

[Clive S]

That's true .. I would like to manually vary the speed of all three motors simultaneously. Toque maybe a factor in the future
There are 40A versions of the Motor controllers for not much money. My understanding of power supply is limited, if I attach 3 motors that draw 2A's each onto a 40A supply will the motors only draw 2A's of the 40 or will the power supply push 13A's to each motor.. ?

The motors will only take what they want so IF the motor need to draw 2A each then it would be 6A total but I very much doubt they they will draw 2A each as you have said they will be operated at very low torque

[Fivetide]

The motors will only take what they want so IF the motor need to draw 2A each then it would be 6A total but I very much doubt they they will draw 2A each as you have said they will be operated at very low torque

Thats what I needed to know ..thanks Clive :)

[Fivetide]

I have the 3A with reverse switch but I order one of these below at 10A to test. I would like to link some sort of LCD RPM display onto it .. guess thats for later.

http://www.ebay.co.uk/itm/12V-40V-10...4AAOSwuAVWxZvG

Features:
Control the speed of a DC motor with this controller.
High efficiency, high torque, low heat generating.
With reverse polarity protection, high current protection.
Working Voltage: DC 12V - DC 40V.
Control Power:0.01 - 400W.
Static Current:0.02 A ( Standby ).
PWM Duty Cycle:10% -100%.
PWM Frequency:13 KHz.
Material: Plastic, metal.
Size:6cm x 7.5cm x 2.8cm
Weight: 70g

[cropwell]

That unit is for DC motors, I thought you had steppers !

[Fivetide]

That unit is for DC motors, I thought you had steppers !

I thought it would be ok ?

[Doddy]

I thought it would be ok ?

Nope, you need a stepper driver.

It's perfectly possible to drive the step/dir signals into multiple drivers - probably preferable to driving potentially unmatched motors in parallel (and offers a choice of multiple supplies if the load becomes an issue), but its a cost balance for your solution.

FWIW - the motors you spec'd - 2A per phase, I guess 2 phase - that's potentially 4A per motor holding current, so you have to be very aware of driving these in parallel.

Speed and direction control are then determined by the state of the dir signal (CW or CCW) and the frequency of the Step line. You could knock up a speed controller using an Arduino Uno or similar and a few lines of C code, and for relatively little extra cost have a full digital control set-up. Happy to give you more info if you want.