摘要
无刷直流电机（BLDCM）是具有定子（电枢）绕组和永磁（PM）或凸极软铁转子结构的新型电机，具有大转矩、高效率、控制简单、易维护等优点。论文从研究永磁无刷直流电机的结构出发，详细论述了其工作原理。分析表明，与传统直流电机有相似的控制性能，即改变电源电压实现无级调速，控制电枢电流即可控制电磁转矩。
系统采用电流环、速度环双闭环的控制策略，电流环与速度环均采用 PI 控制。在比较了各种硬件控制方式的基础上，设计了以16位定点电机优化控制芯TMS320LF2407A为核心的硬件控制系统，并完成了控制系统的软件设计和系统调试。硬件控制系统的设计包括控制电路、电流采样电路、转子位置检测电路以及驱动及逆变电路等；对各功能模块（转子位置捕获、电流采样、速度计算、弱磁、电流调节、速度调节等）的软件实现、数字 PI 算法进行了详细论述。
关键词：永磁无刷直流电机；DSP；数字控制
ABSTRACT
The brushless DC motor (BLDCM) is a new style motor that has stator (armature) windings and a permanent-magnet (PM) or salient-pole soft-iron rotor. Permanent-magnet BLDCM has lots of merits, such as high torque, high efficiency，simple control, low maintenance. This dissertation analyzes in detail on structure and operation principle of permanent-magnet BLDCM. Accurate mathematic As the same as traditional DC motor, the torque produced by the motor is directly proportional to the current fed by the armature windings and generated voltage at the armature terminals is directly proportional to the motor velocity.
Double closed loop PI control strategy was adopted in this control system. Based on the compare of various control modes that are applied on permanent-magnet BLDCM, a DSP-based-control strategy has been put forward. Then the control software and system debug were completed. The design of control hardware included control circuit, current sampling circuit, position detection circuit, drive and inversion circuit. In software design, functional modules and digital PI algorithm have been discussed in detail.
Key words: Permanent-magnet BLDCM；DSP； Numerical control
