| 摘要: | 本研究提出了一種創新的微步進控制步進馬達方法，參考高精度的感測器回饋角度，以並聯調整馬達定子的領先角度及電流，即領先角度及電流雙迴路(Angle and Current Double Loop)回饋控制，簡稱ACDL回饋控制，期望在提高步進馬達定位精度的同時，也能兼顧能量效率。為了實現這個目標，本研究建構了微步進馬達控制系統的軟硬體。硬體部分主要包含了核心的微控制器電路、雙H橋PWM驅動電路、電流感測電路、高精度角度編碼器的讀回電路等。軟體則以實現ACDL控制演算法為核心，配合角度編碼器的校正以達到定位控制需要的精度，並且能夠以軟體直接切換ACDL和傳統控制方法；周邊軟體則是具有方便實驗驗證的數據取樣、儲存以及回傳通訊的功能。
為了驗證這個方法優於傳統的開迴路控制及領先角回饋控制，研究建置了一個具有偏向負載的扭力測試平台，以實測在不同控制方法及偏向扭力負載下，步進馬達在定位精度及驅動功率的差異。本研究提出的步進馬達ACDL控制方法經過實際測試，結果確實可滿足提高步進馬達的定位精度及穩定性，並且降低功耗的設計目標。
此外，這項技術使用很廉價的磁性編碼器就能達成高解析度及高精度，若取代傳統的步進馬達驅動器，並擴展應用在各種定位加工，如3D印表機或是積體電路製造的曝光機，除了改善加工設備的定位性能之外，初期能夠降低製造業投入的設備成本，長期則是降低電能的消耗。同樣的，需要極高旋轉精度控制需求的雷達系統或是飛彈尋標器，也能應用這個演算法和角度校準技術來達成性能的提升。
;This research proposes an innovative micro-stepping control method for stepping motors, referring to the high-precision sensor feedback angle, to adjust the leading angle and current of the motor stator simultaneously, that is, the leading angle-current dual-loop feedback control, referred to as ACDL feedback control. It is expected that while improving the positioning accuracy of the stepping motor, energy efficiency can also be taken into account. To achieve this goal, this research constructs the software and hardware of the micro-stepping motor control system. The hardware mainly includes a core microcontroller unit circuit, double H-bridge pulse width modulation drive circuit, current sensing circuit, and high-precision angle encoder readback circuit. The software takes the ACDL control algorithm as the core, cooperates with the correction of the angle encoder to achieve the accuracy required for positioning control, and can directly switch between ACDL and traditional control methods with the software. The peripheral software has the functions of data sampling, storage, and return communication for convenient experimental verification.
In order to demonstrate the superiority of the proposed method over traditional open-loop control and leading angle feedback control, we constructed a torsion test platform with a biased load. This platform was utilized to assess the variances in positioning accuracy and drive power among the three control methods, considering the presence of biased torsion loads. The findings reveal that the proposed control method outperforms the other two methods by enhancing positioning accuracy and reducing power consumption in a stepping motor.
Since this technology achieves high resolution and high accuracy using very inexpensive magnetic encoders. If it replaces the traditional stepping motor driver and expands its application in various positioning processes, such as 3D printers or aligners for integrated circuit manufacturing. In addition to improving the positioning performance of processing equipment, it can reduce the equipment cost invested in the manufacturing industry in the initial stage, and reduce the power consumption in the long run. Similarly, radar systems or missile seekers that require extremely high rotational precision control requirements can also use this algorithm and angle calibration technology to improve performance. |
