Stepping Motor Control Circuit Prevents Nonrotation via Dynamic Pulse Adjustment

The rotation detecting time period is divided into multiple detection sections (first, second, and third detection sections). By segmenting the detection process, the system can identify specific timing patterns of the detecting signal that indicate genuine rotation versus signal variations caused by drive allowance changes. This allows the control circuit to avoid unnecessary pulse down operations while still detecting actual rotation events, thus preventing nonrotation while maintaining power efficiency.

The system performs preliminary detection in the first detection section to determine whether the detecting signal exceeds the reference threshold voltage before making pulse down decisions. By checking the signal status in advance at multiple sections, the control circuit can predict whether a pulse down operation would be appropriate, preventing premature or incorrect pulse down that would cause nonrotation.

The control circuit dynamically adjusts the drive pulse energy level based on real-time detection results from multiple detection sections. The system transitions from static pulse down timing to dynamic pulse energy adjustment, selecting from multiple main drive pulses with different energy levels (first, second, third main drive pulses). This dynamic adaptation improves rotation stability by matching pulse energy to actual motor needs while using systematic detection sections to manage control complexity.

The system uses feedback from the rotation detecting circuit to control pulse down timing and main drive pulse selection. The detecting signal is continuously monitored across multiple detection sections, and the control circuit adjusts drive pulse energy based on this feedback. This closed-loop feedback mechanism ensures rotation stability while keeping the control logic organized through structured detection sections, preventing unmanageable complexity.