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.
Highlights
Angular acceleration is an important parameter for status monitoring and motion control of rotating system
In order to improve the practical performance of sensor, the noise in the output signal can be reduced by fabricating the case and covers of the sensor using materials with high magnetic shielding performance, or developing a filtering algorithm (e.g., Wavelet de-noising algorithm) as shown in Figure 22, the output signal of this angular acceleration sensor is de-noised by Sqtwolog Wavelet, and the noise is significantly reduced compared with Figure 16
We propose a novel and practical permanent magnetic angular acceleration sensor, which could directly measure the instantaneous angular acceleration of the rotating system, so there is no more problems of delay characteristics and noise amplification compared with indirect angular acceleration measuring techniques [9,10,11,12,19]
Summary
Angular acceleration is an important parameter for status monitoring and motion control of rotating system. The indirect acceleration measuring technique are based on analog or digital post processing of available position or velocity signal [6,7,8]; the signal processing of these methods are very troublesome, especially the problems of delay characteristics and noise amplification are hard to resolve [9,10,11,12], and the rotation range is typically limited due to their mechanical structures [13] All of these have prompted the motivated the efforts to develop transducers for direct sensing of angular acceleration [13,14]. We propose a novel low rotational inertia permanent magnetic angular acceleration sensor. The angular acceleration of the actual rotating systems has been tested, using a single-phase asynchronous motor and step motor, which confirms the operating principle of the sensor
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