有限角磁电编码器角度虚拟补偿细分方法研究

Research on angle virtual compensation and subdivision method for finite angle magneto-electric encoder

提出一种有限角磁电编码器,充分利用有限角狭小的工作空间,采用对称结构设计单对极磁钢与多对极磁钢的布局,对磁钢进行轴向充磁,采用贴片霍尔对单对极和多对极磁场信号进行采集。针对有限角磁电编码器角度信号不完整的特点,采用虚拟角度补偿方法将有限角磁电编码器的角度值信号补充完整。采用自适应多窗口滤波角度细分方法对磁电编码器角度值进行细分,消除了磁电编码器角度值噪声引发的区间判断错误问题,有效提高了有限角磁电编码器的分辨率。最终通过实验证明了所提出的有限角磁电编码器能够有效抑制角度值跳动,电机速度控制更加平稳,电流正弦特性更好。所提出的有限角磁电编码器的分辨率可以达到13位,精度达到±0.25°。

A finite angle magneto-electric encoder is proposed, which can make full use of the narrow working space of the finite angle. The encoder uses a symmetrical structure to design the distribution of single-pole magnetic steel and multi-pole magnetic steel, and the magnetic steels are magnetized in axial direction. The surface mounted device（SMD） Hall components are used to collect the magnetic field signals of single-pole and multi-pole magnetic steels. Aiming at the incomplete characteristics of the angle signal for the finite angle magneto-electric encoder, the virtual angle compensation method is used to completely supplement the angle value signal of the finite angle magneto-electric encoder. The adaptive multi-window filtering angle subdivision method is used to subdivide the angle values of the magneto-electric encoder, which eliminates the problem of interval judgment error caused by the angle noise of the magneto-electric encoder and effectively improves the resolution of the finite angle magneto-electric encoder. At last, experiments prove that the proposed finite angle magneto-electric encoder can effectively restrain the jump of the angle value, the speed control of the motor becomes more stable and the current sinusoidal characteristic is better. Finally, the resolution of the proposed finite angle magneto-electric encoder can reach 13 bits and its accuracy reaches ±0.25°.