To improve the resolution of a magnetic absolute encoder, we propose a new magnetic encoder with an eccentric structure. Since the proposed magnetic encoder consists of only one eccentrically rotating multi-pole magnet and four Hall elements, its structure is very simple and cost efficient. By calculating the absolute offset by combining the look-up table and least squares method, it is possible to calculate the absolute angle even when a multipolar magnet is used for resolution improvement. Furthermore, since the quadrature signal can be calculated, it is possible to configure the converter using the conventional method, and it is very versatile. Experimental results show that the proposed method can achieve both improvements of accuracy by increasing the number of pole pairs and calculation of absolute angle.
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