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| Study on the Angle Sensor of Magnetic Fluid |
| SU Shu-qiang,LI De-cai |
| School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing 100044, China |
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Abstract According to the character that permanent magnet can be suspended in a magnetic fluid, a new type of one-dimensional angle sensor structure is put forward. The operation principle of the sensor is given. A sensor prototype is designed to test the magnetic repulsion curve of permanent magnet by experimental method, based on it the main structure parameters and characteristic parameters of the sensor are determined and sensitivity expressions of its dip angle are obtained. Detection circuit and switching circuit of moving parts in sensor are designed. Experiments show that the output voltage and the inclination is linear when the dip angle is between -18° and 18°,and its resolution is 0.04°. The output voltage is nonlinear with the inclination angle when the dip angle is between 18° and 90° or -18° and -90°, and its resolution is gradually reduced. The structure of sensor is simple, has no wear parts, and it provides a new way to measure the angle of inclination.
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Received: 06 October 2015
Published: 31 May 2016
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2016, Vol. 37 
