| Absolute multi-pole encoder with a simple structure based on an improved gray code to enhance the resolution |
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| 作者姓名： | LIU Yong HAO Shuang-hui HAO Ming-hui |
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| 作者单位： | College of Mechanical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China |
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| 基金项目： | Funded partly by Heilongjiang Province Financial Fund for Researchers Returning from Abroad |
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| 摘 要： | We developed a novel absolute multi-pole encoder structure to improve the resolution of the multi-pole encoder, realize absolute output and reduce the manufacturing cost of the encoder. The structure includes two ring alnicos defined as index track and sub-division track, respectively. The index track is magnetized based on the improved gray code, with linear halls placed around the track evenly. The outputs of linear halls show the region the rotor belongs to. The sub-division track is magnetized to N-S-N-S （north-south-north-south）, and the number of N-S pole pairs is determined by the index track. Three linear hall sensors with an air-gap of 2 mm are used to translate the magnetic filed to voltage signals. The relative offset in a single N-S is obtained through look-up. The magnetic encoder is calibrated using a higher-resolution incremental optical encoder. The pulse output from the optical encoder and hall signals from the magnetic encoder are sampled at the same time and transmitted to a computer, and the relation between them is calculated, and stored in the FLASH of MCU （micro controller unit） for look-up. In the working state, the absolute angle is derived by looking-up with hall signals. The structure is simple and the manufacturing cost is very low and suitable for mass production.
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| 关 键 词： | 光学编码器 编码结构 基础 代码 灰色 线性霍尔传感器 单极点 磁性编码器 |
| 收稿时间： | 2009/3/15 0:00:00 |
Absolute multi-pole encoder with a simple structure based on an improved gray code to enhance the resolution |
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| LIU Yong,HAO Shuang-hui,HAO Ming-hui.Absolute multi-pole encoder with a simple structure based on an improved gray code to enhance the resolution[J].Journal of Chongqing University,2009,8(3):181-187. |
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| Authors: | LIU Yong HAO Shuang-hui and HAO Ming-hui |
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| Institution: | College of Mechanical Engineering, Harbin Institute of Technology, Harbin 150001, P. R. China |
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| Abstract: | We developed a novel absolute multi-pole encoder structure to improve the resolution of the multi-pole encoder, realize absolute output and reduce the manufacturing cost of the encoder. The structure includes two ring alnicos defined as index track and sub-division track, respectively. The index track is magnetized based on the improved gray code, with linear halls placed around the track evenly. The outputs of linear halls show the region the rotor belongs to. The sub-division track is magnetized to N-S-N-... |
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| Keywords: | signal encoding magnetic encoder improved gray code absolute output |
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