摘要：提出一种H桥结构的三相电流合成磁场定向控制的电机控制策略，以避免矢量控制的复杂算法和降低电机参数变化对电机控制性能的影响。依据转子磁场位置确定三相电流的大小和相位以实现三相合成磁场的方向与转子磁场正交；各电流相位决定合成磁场方向；电流的幅值决定转矩的大小。根据H桥结构和永磁同步电动机的数学模型建立了包括电流环和速度环的控制系统仿真模型研究定转子磁场正交控制原理，分析负载转矩波动时和转速给定变化时定转子磁场的正交和速度响应的控制算法。通过仿真分析了定子电流合成磁场定位的准确性和控制过程的实时性，从而为进一步的工程应用研究奠定基础。

关键词：永磁同步电动机；H桥变换器；磁场正交；Simulink仿真
Abstract: This paper presented a kind of motor control strategy which was based on three-phase current synthetic field oriented control of H-bridge, in order to avoid the impact on motor control performance which were taken by complex algorithms of vector control and reducing the variation of motor parameters. Defining the magnitude and phase of the three phase currents based on the position of the rotor field, in order to achieve a three-phase synthesis of the magnetic field direction orthogonal to the rotor field; each phase of current determines the direction of the resultant magnetic field; the magnitude of the current determines the magnitude of the torque. Establishing the control system simulation model which includes current loop and speed loop is based on the decoupled mathematical models of permanent magnet synchronous motor( PMSM) and H-bridge topology, and researched orthogonal rotor magnetic control principle, then analysed orthogonal of rotor magnetic and control algorithm of speed response when the load torque is fluxing and the given speed is changing. This paper analysed the accuracy of stator current synthetic magnetic field orientation and real-time quality of control process by simulation, thereby laying the foundation for further applied research of projects.

Key words: PMSM; converter based on H-bridge; orthogonal magnetic field; Simulink