Design and Implementation of Risc-V AC Servo Driver with Analog Signal

This paper addresses the issues of abnormal power consumption increase, start-up and stop-instantaneous jitter, and steady-state drift in high-precision motion control of servo motors. Through dynamic characteristic analysis and experimental verification, the coupling mechanism of these problems is revealed. The study finds that traditional control strategies are prone to cause current loop saturation under load mutations or high-frequency response scenarios, leading to nonlinear increases in motor winding temperature rise and energy loss. Meanwhile, the combined effects of mechanical transmission chain backlash and electromagnetic harmonic interference exacerbate periodic jitter under medium and low speed conditions. To address these issues, the system adopts a domestic RISC-V (Reduced Instruction Set Computer V) processor M6806 as the main controller and innovatively introduces a dynamic motion compensation mechanism, effectively suppressing trajectory distortion caused by mechanical resonance. By combining motion compensation and resonance suppression techniques, the jitter phenomenon near the mechanical resonance points is eliminated. Experimental results show that the proposed method can reduce system power consumption by 3.8107 times in real experimental scenarios at ±3000 r/min, with no significant jitter or motor position drift during start-up and stop-instantaneous processes. This verifies the effectiveness and engineering applicability of the theoretical framework. By setting different frequencies, electronic gear ratios, and external analog voltage through an LCD, thousands or even tens of thousands of different operating speeds of AC servo motors, including high, medium, and low speeds, can be controlled.