What many people use for those high voltage DC treadmill motors is a MC2100
controller. Those are used in the fancier treadmills that have buttons to tick
the speed up and down.There are many schematics and other info on how to build
a potentiometer controlled PWM circuit for these or an interface to CNC for
speed control.
Cheaper ones with a rotary knob or a slide control most often have an MC60
controller. These may or may not work as a spindle driver, depending on how the
circuitry is setup. Control is as simple as properly connecting a
potentiometer. One I tried was setup to not start the motor until the knob was
up to 50%, where it'd slam on at 50% speed. Then if it was slowed down too
quickly it'd shut down until it was power cycled. I sold it for a decent price,
presumably to someone needing it for a treadmill, because in the listing I
detailed all the reasons it *was not* useful for a machine spindle control.
The MC60 is an SCR controller and it makes the motor quite noisy and torque
suffers at lower RPM.
On Sunday, October 18, 2020, 12:42:32 PM MDT, John Dammeyer
<john.damme...@shaw.ca> wrote:
Way back in 2003 I started a project to control the surplus tread mill motors
I had acquired. At that time I was still just casting parts for making my
Gingery Lathe and thought about making my own DC Servo motor controller.
http://www.autoartisans.com/MotorDrives/MOTOR1-5.JPG
The first prototype had a bunch of problems and then regular paying work took
over, I needed the bench space and never revived the project.
http://www.autoartisans.com/MotorDrives/REVA0059.JPG
The controller was the MC33030
http://www.autoartisans.com/MotorDrives/MC33030-D.pdf
Knowing what I know now I'd never use this device but back then...
John
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