A high-precision positioning servo controller based on phase/frequency detecting technique of two-phase-type PLL

This paper presents a new method proposed for high-precision positioning se rvomechanisms. The servo controller uses a two-phase-type phase-locked loop (PLL) to detect position tracking error and speed fluctuation with high re solution. Because the two-phase-type PLL has a wide frequency range and hig h noise suppression performance, we applied the new controller to high-powe r and high-velocity servo-spindles and achieved high control performance. T he developed servo-spindles were used by a high-productivity numerically co ntrolled gear grinding machine, Experiments of gear grinding were carried o ut, and the results confirmed the performance of the developed controller.