To address issues encountered during prolonged operation of low-voltage servo systems powered by batteries—where continuous battery discharge leads to lowered bus voltage, saturation of back electromotive force, restricted starting current and torque resulting in degraded startup performance, and overall slower system response speed; as well as problems stemming from prolonged motor operation causing changes in resistance and inductance parameters, leading to reduced system efficiency and shortened operational endurance—a control strategy is proposed. This strategy is based on an improved voltage loop Quasi-Z-source inverter adaptive PI regulator for permanent magnet synchronous motors. It integrates the Quasi-Z-source network with traditional low-voltage servo drives, incorporating the rate of change in the amplitude of the synchronous motor phase current as a compensatory factor into the Quasi-Z-source network voltage control loop. This forms a positive feedback voltage loop control structure aimed at boosting the DC bus voltage. Additionally, the strategy employs the least squares method for online identification of motor resistance and inductance parameter variations, enabling real-time adjustment of PI parameters to ensure reliable system operation while extending endurance time. The effectiveness of this control strategy has been demonstrated through MATLAB/Simulink simulations and practical experiments.