描述

扭矩生成定理

PMSM的電磁扭矩分別由定子及轉(zhuǎn)子兩個(gè)磁場(chǎng)交互作用生成。定子磁場(chǎng)由磁通量或定子電流表示，轉(zhuǎn)子磁場(chǎng)由恒定的永久磁鐵(弱磁情況除外)的磁通量表示。若將這兩個(gè)磁場(chǎng)比喻為兩個(gè)條形磁鐵，則可以想像當(dāng)磁鐵互相垂直時(shí)，吸引/排斥磁鐵的力是最大的。這意味著，設(shè)計(jì)人員應(yīng)該要依此定理控制定子電流，也就是要?jiǎng)?chuàng)建垂直于轉(zhuǎn)子磁場(chǎng)的定子向量。轉(zhuǎn)子旋轉(zhuǎn)時(shí)，也就必須更新定子電流，使定子磁通向量與轉(zhuǎn)子磁鐵保持90度垂直。

當(dāng)定子和轉(zhuǎn)子磁場(chǎng)垂直時(shí)，內(nèi)嵌式PMSM的電磁扭矩方程式為：扭矩=33ppPMIqs(pp為磁極對(duì)的數(shù)目，PM為永久磁鐵的磁通，Iqs則為交軸的電流幅值。)當(dāng)磁場(chǎng)垂直時(shí)，電磁扭矩與q軸電流的幅值成正比。微控制器(MCU)須調(diào)節(jié)定子相電流強(qiáng)度，同時(shí)調(diào)節(jié)相位/角度，但這不像直流馬達(dá)控制那樣容易達(dá)成。

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