電流源で駆動されるMR素子を用いた低消費電流磁気エンコ-ダ
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概要
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This paper describes a low current magnetic rotary encoder which is characterized by MR elements (Magneto Resistive elements) with current sources.A magnetic encoder consists of a magnetic drum, MR elements, and a volatge comparator. The magnetic drum is mult-magnetized. The MR elements are connected to a bridge circuit and trans-form a magnetic signal into a voltage signal. However, this bridge type arrangment has less flexibility for pattern design.Next, we propose a new drive method of MR elements. It replaces the MR elements connected to the ground by current sources. Comparing it to the conventional type, we have found that the new type has more flexibility in pattern design. Therefore, we can connect many MR elements in series, and achieve low current.We made this encoder in which twelve MR elements are connected in series. It has a bi-phase rectangular wave at its output. It spends the current of 3.3mA, where the output voltage of power supply is 4.2V. This is an allowable value for the absolute encoder.
- 社団法人 電気学会の論文