Focusing on the defects of the existing online dynamic balancing methods
a new online dynamic balancing method with magneto-rheological effect of magnetic fluid is proposed. The principle of eccentric mass generation due to the change of internal pressure of magnetic fluid under local magnetic field is theoretically analyzed and expounded. The surface topographical images of magnetic fluid are obtained with line laser projection measurement method. It is found that the degree of eccentric mass increases with magnetic induction in the direction of the local magnetic field
thus the practicability of dynamic balancing with magneto-rheological effect is verified. The structure of balancing container and three conjugated C-type electromagnets with 120° each other are designed to implement the correction of unbalance with any arbitrary magnitude and angle. Constructing a finite element model of the designed electromagnet
the magnetic induction intensity of electromagnet is analyzed under given current condition. In the experiment
on-line dynamic balancing is accomplished by utilizing current change of the electromagnet coil. The result of balancing experiment shows that eccentric mass generation due to magneto-rheological effect of magnetic fluid can be employed to correct the rotor unbalance
and the unbalance is decreased by 65.14% after once correction. The performance of the proposed method is also verified.
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references
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