The basis for stepper motor position and position control is the reference zero position; all corners are referenced to this zero position, so the stepper motor must be zero-calibrated before any control. There are many ways to zero calibration, mainly: The method installs a stop stop at the zero position, and then drives the stepping motor to a sufficient angle to the zero position. When the stepping motor returns to the zero position, it is blocked by the stopper, and the motor stops at the zero position. This method of zeroing is simple, but when the motor is blocked by the block, the motor will still be driven to perform the zeroing action, which will not only cause damage to the stepping motor and the transmission mechanism, but also cause severe jitter and large noise. 2. Sensor method. The method installs a position sensor such as a Hall switch and a photodiode at the 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 is stopped at the zero position. This method of zeroing is accurate and reliable, but it increases the complexity of the circuit and has certain requirements for installation. However, this method has poor versatility and has certain requirements on the current phase of each winding of the stepping motor, and this method cannot be used in the microstep driving mode.
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1. Direct zeroing method.
3. Special motor drive chip with stop detection. When the motor is stopped, the chip can immediately detect that the motor is in a stalled state to determine the zero position.
