这是一个专利——一种三自由度特种电机，电机可以有三个自由度 自由转动，普通电机只有一个自由度。此文件也是专利申请标准格式和模版。-This is a patent- a three-degree-of-freedom special motor, the motor can rotate freely with three degrees of freedom, ordinary motor is only one degree of freedom. This file patent appl

步进电机基础知识，怎么转动的根本原理，参数的计算。-Step motor basic knowledge, how to rotate the fundamental principle, the calculation of parameters.