A Five-Freedom Active Damping and Alignment Device Used in the Joule Balance

Damping devices are necessary for suppressing the undesired coil motions in the watt/joule balance. In this paper, an active electromagnetic damping device, located outside the main magnet, is introduced in the joule balance project. The presented damping device can be used in both dynamic and stati...

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Bibliographic Details
Published in:IEEE transactions on instrumentation and measurement 2017-06, Vol.66 (6), p.1309-1316
Main Authors: Xu, Jinxin, You, Qiang, Zhang, Zhonghua, Li, Zhengkun, Li, Shisong
Format: Article
Language:English
Subjects:
Active control
Active damping
Coils
Damping
Electromagnetic damping
Electromagnetics
Force
joule balance
Magnetomechanical effects
Misalignment
misalignment error
Permanent magnets
Planck constant
Position measurement
Torque
watt balance
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Summary:Damping devices are necessary for suppressing the undesired coil motions in the watt/joule balance. In this paper, an active electromagnetic damping device, located outside the main magnet, is introduced in the joule balance project. The presented damping device can be used in both dynamic and static measurement modes. With the feedback from a detection system, five degrees of freedom of the coil, i.e., the horizontal displacements x and y and the rotation angles θ x , θ y , and θ z , can be controlled by the active damping device. Hence, two functions, i.e., suppressing the undesired coil motions and reducing the misalignment error, can be realized with this active damping device. The principle, construction, and performance of the proposed active damping device are presented.
ISSN:0018-9456
1557-9662
DOI:10.1109/TIM.2017.2648958