On 07/14/2020 04:49 AM, Chris Albertson wrote:
But what I wanted to add is that when you read the speed vs. torque curve
it is for FULL steps. The amount of holding torque is reduced with
microsteps. It makes sense too, full steps use full current that is
switched between coils just 100% on or 100% off. With microsteps one
coild gets perhaps 3/8 of full current and the other gets something like
5/8. So the current is overall reduced.
Well, this is only partially true. It is a rare case where
the actual standstill holding torque is exceeded by the
load. Most often, the motor is stalled while moving. The
running torque of a stepper is less (sometimes MUCH less)
than the holding torque, and resonances really hurt the
running torque. A microstepping drive reduces the
resonances, and smart microstepping like Gecko uses adds
active damping to absorb the resonant energy. These systems
will have much higher running torque than a full-step drive.
Jon
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