Modeling and analysis of unbalanced magnetic pull in synchronous motorized spindle considering magneto-thermal coupling

Feng, Wei; Zhang, Kun; Liu, Zongyao; Liu, Baoguo; Zhang, Huijuan; Mei, Junwei; Wu, Luji

doi:10.3233/jae-220034

Cited by 2 publications

(1 citation statement)

References 32 publications

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“…Step-up transformers The whole process of frequency conversion operation of a static frequency converter consists of seven stages: excitation input, initial positioning, intermittent phase change, natural phase change, simultaneous adjustment, starter exit and grid connection [4] [8] .…”

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confidence: 99%

Static frequency converters modelling improvement and harmonic analysis for pumped storage power plants

Yong,

Lixing,

Zhonglong

et al. 2023

Third International Conference on Mechanical Design and Simulation (MDS 2023)

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Pumped storage power station is a device that converts surplus electrical energy into potential energy at low power load valley, mainly by pumping water from the lower reservoir to the upper reservoir through a large turbine unit, and converting potential energy into electrical energy at peak power load; in the study of the unit harmonic problem is the most important is to analyse the static inverter SFC dragging process, but the difficulty of its unit modelling is very great, so an equivalent replacement method is proposed not only to simulate not only the transient process of harmonic generation and transmission when the turbine unit is switched, but also the steady-state process in its stable phase. After a comparative analysis of the principles, this improved modelling was also verified by simulation to be an equivalent replacement.

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mentioning

confidence: 99%

Static frequency converters modelling improvement and harmonic analysis for pumped storage power plants

Yong,

Lixing,

Zhonglong

et al. 2023

Third International Conference on Mechanical Design and Simulation (MDS 2023)

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Effect of Unbalanced Magnetic Pull of Generator Rotor on the Dynamic Characteristics of a Pump—Turbine Rotor System

Wu¹,

Pang

Liu³

et al. 2023

Water

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In pumped storage units, the rotor-bearing electromagnetic system is under the joint influence of hydraulics, mechanics, and electromagnetics, and the mechanism of unit vibration problems is very complex to investigate. ANSYS software is used to establish a three-dimensional model of a pumped storage power plant’s rotor-bearing electromagnetic system, and the stiffness coefficient of the unbalanced magnetic traction forces is calculated using the Fourier series of the magnetic conductivity of the air gap. This shows that the nonequilibrium magnetic attraction increases non-linearly with increasing excitation current and eccentricity of the rotor. At each order, the critical velocity of the rotor system increases as the stiffness factor of the bearing increases, with the greatest increase in critical velocity at the third and fourth orders. In the first-order mode-oscillation pattern, the unbalanced magnetic attraction has an effect on the intrinsic frequency of the transverse oscillation, with a reduction in the amplitude of the intrinsic frequency by 34.65%. Axial and transverse modal vibrations manifest themselves as upward and downward motions and transverse oscillations in different portions of the rotor system, respectively, whereas torsional modal vibrations manifest as a radial broadening or reduction in the generator rotor, runner, and coupling portions of the rotor system. The results of the study provide a theoretical foundation and a computational method for the dynamic analysis and design of the rotor system of pumped storage power stations.

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Modeling and analysis of unbalanced magnetic pull in synchronous motorized spindle considering magneto-thermal coupling

Cited by 2 publications

References 32 publications

Static frequency converters modelling improvement and harmonic analysis for pumped storage power plants

Static frequency converters modelling improvement and harmonic analysis for pumped storage power plants

Effect of Unbalanced Magnetic Pull of Generator Rotor on the Dynamic Characteristics of a Pump—Turbine Rotor System

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