title: A Novel Permanent Magnetic Angular Acceleration Sensor.
abstract: Angular acceleration is an important parameter for status monitoring and fault diagnosis of rotary machinery. Therefore, we developed a novel permanent magnetic angular acceleration sensor, which is without rotation angle limitations and could directly measure the instantaneous angular acceleration of the rotating system. The sensor rotor only needs to be coaxially connected with the rotating system, which enables convenient sensor installation. For the cup structure of the sensor rotor, it has a relatively small rotational inertia. Due to the unique mechanical structure of the sensor, the output signal of the sensor can be directed without a slip ring, which avoids signal weakening effect. In this paper, the operating principle of the sensor is described, and simulated using finite element method. The sensitivity of the sensor is calibrated by torsional pendulum and angle sensor, yielding an experimental result of about 0.88 mV/(rad·s(-2)). Finally, the angular acceleration of the actual rotating system has been tested, using both a single-phase asynchronous motor and a step motor. Experimental result confirms the operating principle of the sensor and indicates that the sensor has good practicability.
authors.affiliation: College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China. zhaohao204@163.com.|Nanhu College, Jiaxing University, Jiaxing 314001, China. zhaohao204@163.com.
authors.forename: Hao
authors.initials: H
authors.lastname: Zhao
authors.affiliation: College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China. fh@hdu.edu.cn.|College of Automation, Hangzhou Dianzi University, Hangzhou 310018, China. fh@hdu.edu.cn.
authors.forename: Hao
authors.initials: H
authors.lastname: Feng
keywords: FEM analysis; calibration and testing; electromagnetic induction; sensor