When the stepper motor is on the main power supply, why does the first step always go back and begin to move on?
In general, the stepping motor is relaxed and does not necessarily stop at any angle when the power is not supplied. The starting position of the power supply is set by the hardware and software in the controller, but it can not guarantee that it is exactly the same as the original stop angle. So, when I get on the electricity, I always move.But this "move" is not always backward". It's a coincidence that you always fall back.
If the software is cleverly designed, this phenomenon can be eliminated. The method is: every time before power, under the current software recording angle (phase) stored in the non-volatile memory "(such as EEPROM), and just when the power reading phase last saved, according to the given initial drive signal. Thus, as long as there is no external force to toggle the angle of the motor as long as the power is cut off, the power will not move when it is powered on.
Main cause：1: stepper motor is driven by stepper driver, stepper driver is sent by microcontroller or PLC HZ waveform to drive.2, PLC or SCM waveform is not "there may be procedures" (broken wave and wave loss).3, stepper drive or stepper motor problems (missing step).
