永磁同步电机宽范围最大转矩控制

Maximum Torque Control of Surface Mounted Permanent Magnet Synchronous Motors in Wide Speed Range

提出一种永磁同步电机新的宽范围弱磁控制策略,根据电机在不同转速段运行时的转矩特性,考虑逆变器的输出电压能力及电机的电流约束条件,以输出最大转矩为目标,分析得出全速范围内的电流矢量控制算法。该方法将全速段分为四个运行区间,可实现恒转矩运行与弱磁控制的快速平滑过渡,使系统在额定转速以下具有恒转矩输出,在高速运行时实现恒功率特性。仿真及实验结果表明,提出的方法可有效拓宽电机的转速运行范围,具有较快的动态响应性能。

This paper presents a novel flux-weakening scheme for surface mounted permanent magnet synchronous motors （SPMSM）. Considering the characteristics of the torque in different speed regions, voltage ratings of the power inverter and current limit of the motor, the optimal current vector assignment scheme is designed for maximum torque. By dividing the whole speed range into four regions, smooth transition of current vector control can be implemented. Maximum torque output under the rating speed and maximum power output in flux-weakening region is guaranteed. Simulation and experimental results verify the feasibility of the proposed control algorithm which expands the operating speed range of the motor and achieves faster response.