Re: [CAD_CAM_EDM_DRO] Re: Newbie building router ?

rmtuckeruk wrote:

> the driver cards are from alzanti.com,i do not think the problem is
> with the drivers, but may be the motors.as i said they are superior
> electic (slo-syn) M091-FC-315C 5.1V @ 1.3 AMPS PER PHASE UNIPOLAR
> im running them at 24v using power resistors.
> i can get far greater pulses per second but the motor drops out at
> about 3 r.p.m.

You need to know that unipolar drive schemes are the slowest performers.
RL drive (what you have with the power resistors) are also the poorest
way to drive a motor. A chopper bipolar drive might improve performance
by a good factor. I've never heard of only 3 RPM, that works out to
600 steps a minute (assuming 200 full steps/rev) or 10 steps a second.
You should be able to produce at least 30 RPM, maybe even better without
load. Are you sure you are getting the correct motor current?

Jon