多模式磁偏码器设计(英文)

Multi-mode magnetic encoder design

为了提供电动机伺服控制所需要的不同模式的位置信号而设计的磁编码器采用了一种全新的双磁钢复合磁路结构。利用2S-10芯片的三轴霍尔效应,感应平行芯片表面的磁场,把磁信号转换成正余弦电信号;在对原始信号误差进行理论分析的基础上,通过DSP对原始正余弦信号进行误差补偿并对角度进行反正切运算,实现增量模式、PWM模式和同步串口模式信号;三步锁定型开关霍尔元件输出无刷直流电机换相信号,最终实现了3种模式信号同时输出。信号右达8位精度、10位分辨率。

In order to meet the requirements of multiple position signal modes needed in the motor servo control, a multi-mode magnetic encoder with the composite magnetic circuit has been newly designed and manufactured. The encoder is composed of one Chip 2s-10 and three locking switch Hall components. Employing the unique effect of Triaxis Hall, Chip 2s-10 can detect the parallel magnetic field over it, and convert the magnetic field signal into the electrical sine signal and cosine signal. After the original signal errors are analyzed, the errors will be equalized. The angle formed by equalized signals is then calculated through arc tangent function by digital signal processor （DSP）. Therefore, the signals of incremental mode, PWM mode, and synchronous serial mode can be output and the signal of three-phase brushless DC motor commutation mode is output as well. Finally, these four different output modes signals are output simultaneously. The signals can reach up to eight signal precision, lO-bit resolution.