Messages

1

General Mach Discussion / Re: High Voltage Unipolar Stepper Driver

« on: October 09, 2008, 01:14:18 PM »

The L297 has a current sensing/limiting chopper that will be used to limit the current to 0.83A.

2

General Mach Discussion / Re: High Voltage Unipolar Stepper Driver

« on: October 09, 2008, 12:44:04 PM »

I'm building the drivers.  The L297 uses step and direction inputs.
I guess the question is two-fold:  Is there any significant performance increase to be had from the higher voltage (160V vrs 46V)?   
Any pitfalls (don't tase me bro!)?   This would be a very inexpensive power supply.  The motors are rated at 0.83A, so
devices that can switch this voltage are pretty cheap too.

3

General Mach Discussion / High Voltage Unipolar Stepper Driver

« on: October 08, 2008, 12:20:04 PM »

I have a bunch of 8V nema 34 motors.  I'm thinking about a circuit: ac to fuse to bridge-rectifier to capacitors to get apprx 160V dc for a unipolar driver that uses TIP 50s and a L297 chopper/controller.  Am I nuts(?)  Cheap parts, should make em go... anybody tried this? Any suggestions?