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Is skipping steps bad for a stepper motor?
1 Answer. Stepper motors (depending on how they are driven) are generally always on. You change the polarity of the signal driving the coils in a sequence to control movement. So leaving the motor powered is not going to damage it.
How can you tell if a stepper motor stalls?
Electronic stall detection works by measuring the effect of back EMF on the number of PWM cycles. When a motor is stopped or moving slowly, there is little back EMF to impede the current in the phase windings. This allows the current to rise to the limit quickly and the PWM current control to activate.
Can a stepper motor detect resistance?
Resistance in the stepper motors is measured on the two phases. To measure the resistance, disconnect the motor at the connectors (see Figure 1). A low measurement indicates the motor has a shorted winding. A high measurement indicates the motor has an open winding.
What is the rated voltage of a stepper motor?
The “rated voltage” for a stepper motor is the applied voltage that will produce its rated coil current purely via coop resistance (after enough time passes for the current to rise to its steady-state value).
What causes a stepper motor to speed up or slow down?
The current undergoes a 90° phase lag from the commanded current as the driver switches from current control mode to voltage drive mode. Any mechanical ringing of the rotor pendulum causes the motor to speed up and slow down, changing both the velocity and relative angle between the driven field angle and the rotor angle.
Why do Steppers lose steps when microstepped?
(Note microstepping is most effective with motors that have been optimized for it. To illustrate, many stepper motors optimized for full stepping have a detent torque that aids full-step positions, but actually causes significant cogging when microstepping.)
How does a cycle work in an open loop stepper?
Thus the system cycles: The motor slows below the speed of the load, again the load decouples, and then the motor speeds up. In some cases, the change in speed may be enough for the gears to first strike on one face and then rebound and strike on the opposite side, to repeat several times.