Modeling and control of a bearingless permanent magnet synchronous motor

To handle the unbalanced vibration caused by uneven rotor mass distribution in a bearingless induction motor (BIM), a control strategy that integrates unbalanced feed-forward compensation and current compensation is presented. Firstly, based on the analysis of the BIM rotor vibration mechanism and the unbalanced vibration influence on the performance of the BIM, the dynamic model of the rotor is derived. Secondly, an unbalanced force feed-forward compensation controller is designed to extract the synchronous vibration signals through the synchronous signal detection unit, and then the compensation force components are generated by unbalanced feed-forward compensation controller. In addition, considering the influence of current in the rotor induced by suspension winding, a current compensation link is applied to the system to enhance the suspension performance. Finally, a rotor unbalanced vibration compensation control system of the BIM is established. The simulation and experimental results show that the proposed compensation control strategy not only can effectively reduce the rotor radial displacement and suppress the unbalanced vibration, but also can improve the suspension performance. INDEX TERMS Bearingless induction motor (BIM), current compensation, feed-forward compensation, radial displacement, rotor eccentricity.

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“…The radial suspension forces of the BIM in the x, y directions that are derived from Maxwell tensor method can be expressed as [42]- [44]:…”

Section: B Mathematical Model Of the Bimmentioning

confidence: 99%

Rotor Vibration Control of a Bearingless Induction Motor Based on Unbalanced Force Feed-Forward Compensation and Current Compensation

et al. 2020

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“…It is assumed that λ r and λ θ are sinusoidal functions [23]. Accordingly, the second terms in the right side of (12) and 13have exactly the same harmonic contents as the first terms. Therefore, neglecting the second term does not change the harmonic contents of the radial and tangential flux densities.…”

Section: Rotor Eccentricitymentioning

confidence: 99%

“…Therefore, neglecting the second term does not change the harmonic contents of the radial and tangential flux densities. Consequently, (12) and (13) can be written as [22,24]:…”

Section: Rotor Eccentricitymentioning

confidence: 99%

“…The expressions (14) and (15) can be correct for the motors with a small ratio of eccentricity to air-gap length (e/g). However, for the motors with a large ratio of e/g, it is better that the expressions (12) and (13) are used. The definition of the air-gap length is shown in Fig.…”

Section: Rotor Eccentricitymentioning

confidence: 99%

“…Numerous papers have calculated the radial suspension force in the BPMSM with no regard to the space harmonics of the air-gap magnetic flux density [6][7][8][9][10][11][12][13][14][15]. Other studies have derived analytical expressions of the radial suspension force based on the 1-D analytical model of air-gap flux density distribution [16,17].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Analytical modelling of radial suspension force in bearingless surface‐mounted PM synchronous motors considering static rotor eccentricity

Jafarboland

Shirzadi

2019

IET Electric Power Applications

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In this study, a new analytical model is provided in order to calculate the radial suspension force in bearingless surface-mounted permanent magnet synchronous motor with static rotor eccentricity. The proposed model is based on the harmonic analysis of magnetic flux density, and considers the influence of both radial and tangential air-gap field components on the computation of radial suspension force. This model can reveal the generation mechanism of the radial suspension force and identify the generation sources of the force ripples. Furthermore, the magnitudes and frequencies of radial suspension force harmonics, and the relationship between the radial suspension force and rotor eccentric displacements can be accurately predicted by the proposed model. However, this model cannot be used for saturated machines. The analytical model is verified by finite-element analyses and the result of static experimental study.

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A Data-Driven Method for Iron Loss Estimation in Bearingless Permanent Magnet Synchronous Motors

Xu,

Guo,

Lei

et al. 2023

2023 IEEE International Future Energy Electronics Conference (IFEEC)

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Modeling and control of a bearingless permanent magnet synchronous motor

Cited by 12 publications

References 29 publications

Rotor Vibration Control of a Bearingless Induction Motor Based on Unbalanced Force Feed-Forward Compensation and Current Compensation

Rotor Vibration Control of a Bearingless Induction Motor Based on Unbalanced Force Feed-Forward Compensation and Current Compensation

Analytical modelling of radial suspension force in bearingless surface‐mounted PM synchronous motors considering static rotor eccentricity

A Data-Driven Method for Iron Loss Estimation in Bearingless Permanent Magnet Synchronous Motors

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