Field Weakening Control Method of Subsection Variable Quadrature Axis Voltage for Permanent Magnet Synchronous Motor
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摘要: 水面生命探测机器人等救援探测设备在运行状态下, 其供电电压会发生下降, 为提高其机动性和稳定性, 可进入弱磁扩速状态。在供电电压恒定的情况下, 通过变交轴电压法的单电流调节器控制, 可有效避免双电流调节器造成的控制系统复杂化, 以及系统失控和控制效率过低等问题, 实现结构简单、控制安全和方便的效果。文中改进了弱磁控制系统的反馈环节和变交轴电压给定方式, 增加了限幅处理, 提出一种交轴电压给定方式, 将电机弱磁过程划分为恒功率弱磁和深度弱磁2个部分, 分段实时调节交轴电压, 使电机在深度弱磁状态下鲁棒性更强, 提高电机高转速下的稳定性。通过Simulink仿真及实验数据分析, 证实了该控制方法的可靠性。Abstract: When rescue detection equipment such as water-surface life-detection robots are in operation, their power supply voltage drops, which can cause them to enter a weak expansion state to improve maneuverability and stability. Under the condition of constant supply voltage, a single-current regulator control of the variable quadrature axis voltage method can effectively avoid the complexity of the control system caused by a double-current regulator, which maintains system control, improves the control efficiency, allows for the realization of a simple structure, provides safe control, and has a convenient effect. In this study, the feedback link of the field weakening control system and given method of variable quadrature axis voltage are improved, and a limit processing is added. A method of quadrature axis voltage setting is proposed, which divides the motor field weakening process into constant power field weakening and deep field weakening; in two parts, the quadrature axis voltage is adjusted in real time, in sections, to make the motor more robust in the deep field weakening state and improve its stability at high speeds. Through a Simulink simulation and an experimental data analysis, the reliability of the control method is verified.
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