基于开关型霍尔的PMSM改进型位置检测策略

为了克服霍尔传感器的局限，利用低分辨率的信号实现更精确的位置检测，提出一种基于改进最小二乘法和积分型滑模观测器的混合控制策略。首先，利用改进型最小二乘法完成可靠起动与低转速下平稳运行；其次是到达指定切换速度，系统切换运行状态，通过改进最小二乘法对积分型滑模观测器进行不断校正，在减小系统的滞后与累积误差的同时，使输出的位置信号尽可能连续。最后通过改进型位置检测策略与传统一阶加速度位置检测策略进行对照试验，结果表明，所提出的改进型位置检测策略，在电机起动时的位置检测精度提高了30%以上，在电机中高速稳态时转速误差降低至05%以内，位置检测误差降低至1%以内，具有较高的位置检测精度。

Improved position detection strategy for PMSM based on switch-type hall sensors

To overcome the limitations of the Hall sensor, a hybrid control strategy based on improved least squares method and integral sliding mode observer is proposed to achieve more accurate position detection using low-resolution signals. Firstly, the reliable start-up and smooth operation at low speeds are achieved using the improved least squares method. Secondly, upon reaching the specified switching speed, the system switches operating states, continuously correcting the integral sliding mode observer using the improved least squares method to reduce system lag and cumulative errors while making the output position signal as continuous as possible. Finally, a comparative experiment is conducted between the improved position detection strategy and the traditional first-order acceleration position detection strategy. The results show that the proposed improved position detection strategy increases the position detection accuracy by over 30% during motor start-up, reduces speed error to within 0.5% at medium to high motor speeds, and reduces position detection error to within 1%, demonstrating a higher level of position detection accuracy.