A study on stepping servo control system by phase-locked technique

A phase-controlled oscillator (PCO), composed of an adaptive digital-pumped controller (ADPC) and a voltage-controlled oscillator (VCO), is proposed as a novel stepping motor driver. Therefore, a phase-locked stepping servomechanism (PLSS) is established, and the PCO can provide an accurate and stable pulse train to adaptively drive the stepping motor. System modeling, analysis, stability investigation, design, and implementation were all conducted. Computer simulation and experiment results indicate that the performance of the PLSS is close to the theoretical prediction. Some speed responses for 40-1000 RPM are examined in a real PLSS. A good speed regulation of +or-0.15 RPM is achieved. An adaptive line density selector can be used to improve the system performance.<
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