变极

The paper introduces the DSP control of brushless DC motor, and the principle, management as well as software correcting of CEMF pole changing. 本文介绍了无刷直流电机的DSP控制,详细介绍了在无刷直流电机控制中反电势检测换相的原理; 反电势、电流检测的管理;

The shadow of the bamboo pole changes as the sun moves. 竹竿的影子便随着太阳的移动而变化。

In the gap magnetic field of pole changing synchronous machine,there would be large harmonics,which have some effects on the operating performance of the machine. 由于变极同步电机气隙磁场中将存在较大的谐波,这些磁场谐波对电机运行性能将产生一些影响。

Based on analysis of the ampere conductor harmonics of pole changing windings and the adjusting wave with Fourier Transformation,a discussion has been done in the paper on the symmetry,M. M. F. 在用傅氏变换分析变前极绕组安导波及其调制波基础上 ,讨论了用逐相安导调制法得到的变后极绕组的对称性、磁势谐波含量、磁势主波旋转方向及变极方案择优等

reversing method of pole changing 反向法变极

He flew to Europe via the North Pole. 他经由北极飞到欧洲。