Stepper motor driver's super memory function - Database & Sql Blog Articles

Single chip microcomputer STM32L151CCU6

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The stepper motor driver is in a certain phase when the power is turned off. If the phase is different from the phase at the next power-on, the motor will “jitter”. In order to eliminate the jitter, the phase at the time of power-off must be remembered. The stepping motor runs at a timing of eight. If it stops at step 4, the board is powered off. After power-on again, if you start driving step 1 directly at position 4, a jump will occur. If the system can still remember that it is still in step 4, then you can correctly issue the command to go to step 5 or step 3.

Most stepper motor drivers do not have a power-down phase memory function, especially a stepper driver using a common dedicated IC. The reset signal of the reset pin after the dedicated IC is powered up will reset the motor phase to the initial value, and the power-on jitter should be inevitable. Even if it is an absolute value servo motor, it has to be judged and corrected, and it can also be regarded as jitter. Or strictly speaking, there is no motor that does not shake on power. The key is how much impact this jitter has on your application. It is best to record the absolute stop coordinates. After power-on, the system resets the checkpoint and then runs to the absolute coordinate recovery before power-off.