你好。
我在学习PMSM3_1的代码例子。其中有句注释是写per-unit (pu)，请问哪里有详细的技术文档？
typedef struct {
_iq ElecTheta; // Input: Electrical angle (pu)
Uint32 DirectionQep; // Variable: Direction of rotation (Q0) - independently with global Q
_iq Speed; // Output: Speed in per-unit (pu)
} SPEED_MEAS_QEP; // Data type created