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

[magicniner]

In my mind its a DC motor with the ability to do stepping ?

It's a motor where energising multiple windings sequentially results in movement, the stepper driver deals with this, just applying DC or even PWM DC will not run a stepper motor, try it ;-)

I just want a small DC motor to turn at below 109 RPM. Hence why I thought a regular DC pulse regulator would just spin it in one direction..

Having control of precise steps allows you to use a frequency generator to create a precise RPM

I just want a small DC motor to turn at below 109 RPM.

You could just use conventional DC motors with a PWM driver but you will find you have some variation of speed with identical motors driven from a common supply.