Design Of The Magnetoresistive Angle Sensor Based On The Amr Effect

The sensor technology is not only one of the three backbones in the information industry, but also the source of all the information. Being one of the most important sensors, the angle sensor, requires the effective approach to keep it developing continuously. Therefore, the further development of the angle sensor with new materials and theories, as well as the improvement of the angle sensor in its performances and applications turn out to be the hotspot of the angle sensors' researching field.After analyzing the status quo of the angle sensor, we found that the magnetoresistive angle sensor have lots of advantages. Its measurement modes are contactless and absolute, and it can overcome the touch error and get the absolute angle placement immediately if the system power on. Though it has the good application foreground, its measurement range is not enough. Therefore, the aim of the paper is to enlarge the measurement range of the magnetoresistive angle sensor.Enlarging the measurement range directly will make sensor sensitivity reduced, and influence the signal-to-noise ratio. However, it is difficult to settle this problem through the basic sensor research. The effective methods, which can enlarge the measurement range of the magnetoresistive angle sensor, should focus on improving the performance and extending the application of the current angle sensors.According to the development trend of the angle sensors, and the function characteristic of the intelligent sensor, we developed a magnetoresistive angle sensor, which is based on the honey-well magnetoresistive angle sensor HMC1512 and the hall SS495A. On the basis of the judgment and the processing abilities of the integrated data acquisition and Processing chip ADμC842, we have designed integrated and the intelligent angle sensor and realized full angle measurement.The measurement result indicates that the measurement range of magnetoresistive angle sensor is 0 ～ 359.95 , and its accuracy is 0.8. The error analyses prove that its performance would be more improved. It can overcome the impurity pollution and mechanism librations and have the abilities of low cost and small volume, so it has capacious application foreground.