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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.


The magnetic circuit of ФP.
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sensors-15-16136-f005: The magnetic circuit of ФP.

Mentions: The magnetic circuit of ФP generated by the permanent magnetics is shown in Figure 5. It forms a closed loop by passing through the outer stator, air and the inner stator. The copper sleeve is used here to guarantee ФP will pass through the air. Assuming symmetrical magnetic circuit, according to the Ohm’s law and Kirchhoff’s voltage law of magnetic circuit theorem, ФP can be expressed as:(1)ΦP=FPRmP=HPlPRmPwhere FP: The magnetomotive force generated by the permanent magnets; RmP: The reluctance of magnetic circuit ФP; HP: The strength of the magnetic field in the permanent magnets; lP: The effective thickness of permanent magnets.


A Novel Permanent Magnetic Angular Acceleration Sensor.

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

The magnetic circuit of ФP.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-16136-f005: The magnetic circuit of ФP.
Mentions: The magnetic circuit of ФP generated by the permanent magnetics is shown in Figure 5. It forms a closed loop by passing through the outer stator, air and the inner stator. The copper sleeve is used here to guarantee ФP will pass through the air. Assuming symmetrical magnetic circuit, according to the Ohm’s law and Kirchhoff’s voltage law of magnetic circuit theorem, ФP can be expressed as:(1)ΦP=FPRmP=HPlPRmPwhere FP: The magnetomotive force generated by the permanent magnets; RmP: The reluctance of magnetic circuit ФP; HP: The strength of the magnetic field in the permanent magnets; lP: The effective thickness of permanent magnets.

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.