Technical Briefs

A Novel Active Online Electromagnetic Balancing Method—Principle and Structure Analysis

[+] Author and Article Information
Shilei Ma, Shiyuan Pei, Lin Wang, Hua Xu

School of Mechanical Engineering, State Key Laboratory for Manufacturing System Engineering,  Xi’an Jiaotong University, No. 28, Xianning West Street, 710049, Xi’an, P. R. C.

J. Vib. Acoust 134(3), 034503 (Apr 24, 2012) (8 pages) doi:10.1115/1.4005831 History: Received December 06, 2010; Revised October 25, 2011; Published April 23, 2012; Online April 24, 2012

Vibrations caused by the imbalance of a rotor are a frequently encountered problem in machining processes. Especially in high-precision finishing, the workpiece quality is strongly related to the vibration of the machine-tool spindle, which is mainly caused by mass imbalance and cannot be completely eliminated in cutting tools with nonaxisymmetrical structures. An imbalance in centrifugal force is generated by rotor rotation and increases rapidly with rotational speed. A novel active online electromagnetic balancing method based on static magnetic-field analysis is proposed, and an active online electromagnetic balancing device (AOEBD) based on this method was developed under these conditions. The magnetic-field distribution and electromagnetic force generated by the device were analyzed by finite-element modeling. The influence on the electromagnetic force of the misalignment between the rotor and the iron core was investigated. Factors influencing the magnetic force of the device were determined, and reasonable reference values were suggested. The critical eccentricity was also provided. Experiments had been done at last, and the experimental results presented a good performance of this kind of balancing device.

Copyright © 2012 by American Society of Mechanical Engineers
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Figure 1

Schematic of dynamic balancing principle

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Figure 2

Schematic diagram of directionally fixed force systems: (a) three-direction fixed-force system, (b) four-direction fixed-force system, (c) six-direction fixed-force system, (d) eight-direction fixed-force system

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Figure 3

Schematic diagram of the generation of magnetic force

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Figure 4

Schematic diagram of the balancer structure and parameters

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Figure 5

Schematic of the relative positions of the bosses

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Figure 6

Geometry and meshed-element model of one iron core, air gap, and rotor with boss

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Figure 7

Distribution of magnetic-flux density around the rotor

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Figure 8

Magnetic-force vectors acting on the rotor

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Figure 9

Electromagnetic force variation with NI

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Figure 10

Electromagnetic force variation with α

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Figure 11

Electromagnetic force variation with l0

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Figure 12

Maximum and minimum electromagnetic force change with misalignment in one rotation cycle

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Figure 13

Electromagnetic balancing device test rig

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Figure 14

Axis orbits comparison in different current intensity under the rotating speed of 2400 rpm (40 Hz)

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Figure 15

Axis orbits comparison in different current intensity under the rotating speed of 3600 rpm (60 Hz)




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