What is holding torque?
Holding torque refers to the torque of the stator locking the rotor when the stepper motor is powered but not rotating. It is one of the most important parameters of the stepper motor. Usually, the torque of the stepper motor at low speed is close to the holding torque. Since the output torque of the stepper motor decays with the increase of speed, and the output power also changes with the increase of speed, the holding torque has become one of the most important parameters for measuring stepper motors. For example, when people say a 2N.m stepper motor, it means a stepper motor with a holding torque of 2N.m without special instructions.
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