Because the single-phase brushless fan motor presents an inductive load, the winding current will lag the back-electromotive force (EMF) an unequal phase based on the different motor speed. In order to improve the efficiency and torque performance, adjusting the commutation angle to keep the optimizing commutation at different speed is necessary. In this paper, the new structure with low cost to achieve the optimizing commutation is accomplished by the concept of phase-locked loop (PLL) to synchronize the winding current and back EMF. The PLL IC CD4046 is adopted to develop a feedback circuit and performs the function of phase advance. The purpose is to force the winding current to be synchronized with the back-EMF. Finally, the related experimental results are used to confirm the feasibility and effectiveness of the proposed driving method.
展开▼
机译：由于单相无刷风扇电动机会产生感性负载，因此绕组电流将基于电动机速度的不同而使反电动势（EMF）滞后于不相等的相位。为了提高效率和转矩性能，有必要调节换向角以保持不同速度下的最佳换向。在本文中，通过锁相环（PLL）的概念实现了低成本的新型结构，以实现最佳的换向，该同步结构使绕组电流和反电动势同步。 PLL IC CD4046用于开发反馈电路并执行相位超前功能。目的是强制绕组电流与反电动势同步。最后，利用相关实验结果验证了所提方法的可行性和有效性。
展开▼
