盘式无铁心永磁同步电机矢量控制技术分析

Analysis on Vector Control for Disc Coreless Permanent Magnet Synchronous Motors

盘式无铁心永磁同步电机的定、转子均为无铁心结构,在同等输出功率和转矩条件下,电机重量较轻,并具有过载能力强、无齿槽转矩、气隙磁场分布正弦性好、电枢反应小、参数线性等优点。作为电动机应用时,特别适合对电机体积有特殊要求且低速性能好、响应速度快、过载能力强的场合。同样,因为无铁心结构,电机定子绕组电感很小,很小的电感导致通以绕组内的电流不连续,从而产生电磁转矩脉动。该文提出一种电机外部串电感的方法,增大定子绕组回路的电感值,设计了基于转子磁场定向的盘式无铁心永磁同步电机调速驱动系统。仿真和实验结果证实了控制方法的有效性,电机转速平稳且无静差,超调量小;能够获得较大启动转矩,响应速度快。

The stator and rotor of the disc coreless permanent magnet synchronous motor （DCPMSM） both have a coreless structure, so the motor is lighter than that with iron cores in the condition of the same power and torque. Since DCPMSM has many advantages, including strong overload ability, no cogging torque, the sinusoidal distribution of flux density, the small armature reaction and the linear parameters etc., it is particularly suitable for the workplace where has special requirements for the motor volume, low-speed performance, fast response and strong overload ability. But for the coreless structure, the value of the inductance is very small, which makes the stator current cannot be continued with the PWM control based on VSI, resulting in the large motor torque ripple. To solve this problem, three inductances were added in the stator winding circuit to increase the value of the stator inductance, and a rotor flux oriented control algorithm was used in the disc coreless PMSM drive. Simulation and experimental results verify the validity of the proposed control method. The motor speed is smooth, no static error, and less overshoot. The system has fast response with the large starting torque.