Viewmaster wrote:I am using a 1.8 degree stepper motor, running at 60 RPM with a drive frequency of 200Hz into the motor driver board. (an Easydriver)
I need it to reverse run at least x16 faster......960RPM with 3.2kHz.
Until last week no matter what I did ( changing drive volts up to 35 and
trying various motors of different resistances ), I could not make it run faster than 240RPM with driving frequency of 800Hz.
But yesterday I knocked up a variable freq square wave generator and found that if I started the motor slow and increased the freq slowly it now runs at over 1000 RPM, giving me the x16 rewind.
What puzzles me is that is this normal for stepper motors, to make them run fast, the drive frequency has to be increased slowly rather that suddenly switched in?
Thanks
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Hi Albert yes they are fussy buggers !
Did you try adjusting the pulse width i think the pulse width needs to change with the frequency increase some thing i wanted to try after the post on Hd motors i had a while back .
I want to do it at the same time bit hard with 2 pots but a dual pot will increase the frequency and change the pulse width same time .
They can run fast just need the correct pulse for the speed ...what i have seen on the net on high speed experiments its sure possible .
But i do think they are all the same and need a slow start up or they will stop, every one i have tried have to be run like that .
The electromagnetic spectrum has no theoretical limit at either end. If all the mass/energy in the Universe is considered a 'limit', then that would be the only real theoretical limit to the maximum frequency attainable.