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A Novel Permanent Magnetic Angular Acceleration Sensor.

Zhao H, Feng H - Sensors (Basel) (2015)

Bottom Line: 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.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)).Experimental result confirms the operating principle of the sensor and indicates that the sensor has good practicability.

View Article: PubMed Central - PubMed

Affiliation: College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China. zhaohao204@163.com.

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.

No MeSH data available.


Cross-sectional sketch view of the sensor.
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sensors-15-16136-f003: Cross-sectional sketch view of the sensor.

Mentions: The permanent magnets 5 are used for the generating constant air-gap magnetic field. When measuring the angular acceleration, the cup-shaped rotor 3 is connected coaxially with the shaft of the measured rotating system, and cuts the air-gap magnetic field formed by the permanent magnets 5. The output winding 8 will then generate electrical signals which correspond to the angular acceleration of the rotating system. A 3D cross-sectional view of the sensor is shown in Figure 2, while the cross-sectional sketch map of the sensor is shown in Figure 3. According to the entity of the cup rotor is shown in Figure 4, we could know that the rotational inertia of sensor is relatively small.


A Novel Permanent Magnetic Angular Acceleration Sensor.

Zhao H, Feng H - Sensors (Basel) (2015)

Cross-sectional sketch view of the sensor.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541871&req=5

sensors-15-16136-f003: Cross-sectional sketch view of the sensor.
Mentions: The permanent magnets 5 are used for the generating constant air-gap magnetic field. When measuring the angular acceleration, the cup-shaped rotor 3 is connected coaxially with the shaft of the measured rotating system, and cuts the air-gap magnetic field formed by the permanent magnets 5. The output winding 8 will then generate electrical signals which correspond to the angular acceleration of the rotating system. A 3D cross-sectional view of the sensor is shown in Figure 2, while the cross-sectional sketch map of the sensor is shown in Figure 3. According to the entity of the cup rotor is shown in Figure 4, we could know that the rotational inertia of sensor is relatively small.

Bottom Line: 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.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)).Experimental result confirms the operating principle of the sensor and indicates that the sensor has good practicability.

View Article: PubMed Central - PubMed

Affiliation: College of Information Engineering, Zhejiang University of Technology, Hangzhou 310023, China. zhaohao204@163.com.

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.

No MeSH data available.