永磁同步电机分段变交轴电压弱磁控制方法

Field Weakening Control Method of Subsection Variable Quadrature Axis Voltage for Permanent Magnet Synchronous Motor

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。

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.