How to restore Zhi Ming's stepping torque to its original state?

1, direct zero adjustment method, this method installs a stop block at the zero position, so that the stepping motor can be driven to the zero position at a large enough angle. When the stepping motor returns to the zero position, it is blocked by the stopper, and the stop position of the motor is the zero position.

2. Sensor method: Install position sensors such as Hall switch and photodiode at zero position. When the stepping motor returns to the zero position, the sensor gives a detection signal, and when the control circuit detects the signal, the motor stops at the zero position.

3. A special motor driver chip with stall detection is adopted. When the motor stops running, the chip can immediately detect that the motor is in a stall state and determine the zero position.

4. Adjust the duty cycle of PWM signal, construct a sinusoidal driving current whose amplitude decays according to a certain law, and add this current to each winding of the stepping motor with a certain phase difference, so that the stepping motor is driven in micro steps and its torque decays according to the expected law.