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Stepper motor torque varies with the stepper motor speed. The torque is not the maximum whether the speed is too high or too low, the maximum torque is only available at a certain speed or within a certain speed range. The maximum torque generally occurs in the middle and low speed range of the stepper motor. As the speed increases, the torque will decrease. The greater the torque, the greater the "strength" of the stepper motor output and the faster the change of the output shaft speed.
The maximum torque of a stepper motor is related to the design of voltage, current, and self-resistance. At a certain speed, the performance matching of these systems is optimal, and the maximum torque can be achieved. In addition, the power, torque and stepper motor speed are related.