Is there any loss of position when the motor control is switched off?
Support » FAQ » Stepper motor positioning controls
If the rotor is also to retain its position at a standstill, the stepper motor must remain actuated/energized. Nanotec positioning controls have an enable input which is used to deactivate the drive and deenergize the motor. The motor then engages in the next stable stator/rotor position which means it can jump forwards or backwards a maximum of 2 full steps. When it is switched on again the same step sample is activated and the rotor is pulled back into the same phase position again via the transistors. If the voltage is switched off altogether, however, the motor can lose its final position when it is switched on again because it can engage either 2 full steps forwards or backwards.
Because the torque and the total input power of the stepper motor reach a maximum at a standstill, a current reduction is recommended in the case of prolonged standstill periods.
Hybrid stepper motors have relatively high detent torque/self holding torque so that if the load moment is not greater than the self holding torque, the motor also has a braking effect at a standstill.
