Right but if i did too smoothly, it also stalled, so that's strange. I think passed the datasheer performance, there are tricks. It can also resonate at certain frequencies, so it ran above or below them, but stalls at some frequencies. Quite odd, there's a good load of tricks if we look into the details of it. Regards Jean-François
Note on this, there's a frequency related similarly to a sawtooth torque, due to the internal construction, stepper and BCLD motors have an oscillating torque superimposed with the driving torque. That can resonante, it can al help or go against depending on actual speed, because that's phase dependent, hence resonant frequencie, and higher/lower torques at particular frequencies. That's interesting, essentially, when a system becomes quite dynamic (ie high speed, high accelerations, etc ...), fine tuning these parameters (ie finding those speed ranges and perhaps forbid running inside them) is probably required. Regards, Jean-François
You can drive virually any stepper at higher than it is rated, until you add a load. The ratings aren't for an unloaded stepper as an unloaded stepper doesn't do anything and as such not how they are used in the real world. You also can't really count on the accuracy when you exceed their specifications.
Yes but i found an interesting thing too, there's a specific speed ramp and frequency to reach high speed. That's because of some motor construction, the magnetic pulsating torque or other aspects, i'm not too sure why, but only a fast accelerating ramp and special high speed worked. Like it stalls much slower (about 30% slower) if you don't have found the right parameters, funny trick. Jean-François
I think the most important part is the step frequency ramp up. If you do it instantly, the motor stalls and jitters.
Right but if i did too smoothly, it also stalled, so that's strange. I think passed the datasheer performance, there are tricks. It can also resonate at certain frequencies, so it ran above or below them, but stalls at some frequencies.
Quite odd, there's a good load of tricks if we look into the details of it.
Regards
Jean-François
Note on this, there's a frequency related similarly to a sawtooth torque, due to the internal construction, stepper and BCLD motors have an oscillating torque superimposed with the driving torque. That can resonante, it can al help or go against depending on actual speed, because that's phase dependent, hence resonant frequencie, and higher/lower torques at particular frequencies.
That's interesting, essentially, when a system becomes quite dynamic (ie high speed, high accelerations, etc ...), fine tuning these parameters (ie finding those speed ranges and perhaps forbid running inside them) is probably required.
Regards,
Jean-François
You can drive virually any stepper at higher than it is rated, until you add a load. The ratings aren't for an unloaded stepper as an unloaded stepper doesn't do anything and as such not how they are used in the real world. You also can't really count on the accuracy when you exceed their specifications.
Yes but i found an interesting thing too, there's a specific speed ramp and frequency to reach high speed.
That's because of some motor construction, the magnetic pulsating torque or other aspects, i'm not too sure why, but only a fast accelerating ramp and special high speed worked.
Like it stalls much slower (about 30% slower) if you don't have found the right parameters, funny trick.
Jean-François
@@chrysalide_electronics Interesting.