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

Jafarboland, Mehrdad; Shirzadi, Ali

doi:10.1049/iet-epa.2018.5607

Cited by 10 publications

(4 citation statements)

References 28 publications

(56 reference statements)

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“…The currents of the six-suspension pair of poles which required to cancel the radial force 4. Noted that the maximum values for cancellation current are (31) Ampere in coil (1,7) and (46) Ampere in coils (2,8), (3,9), (4,10), and (85) Ampere in coils (5,11), (6,12).…”

Section: Cancellation Of Radial Force By Using All-suspension Polesmentioning

confidence: 99%

“…In comparison with a magnetic bearing machine, bearingless motors feature shorter rotor shafts and more incredible critical speeds and they are suitable for super high-speed applications due to the advantages of low friction losses, no lubrication need, no vibration noise, and long life [2]- [4]. Bearingless machines solve the limitations of axial length, large-volume motors, complex system structure, and the high cost of pure magnetic bearings.…”

Section: Introductionmentioning

confidence: 99%

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Radial force cancellation of bearingless brushless direct current motor using integrated winding configuration

Yousif

Mohammed

Ali

2022

IJEECS

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A bearingless brushless direct current (BLDC) motor incorporates the function of magnetic bearings into a BLDC motor, making it a new type of high-performance motor. In this paper, the main motor windings are used to generate the radial force cancellation by injecting the required dc current, “integrated winding configuration”. The bearingless BLDC motor, direct current (DC) cancellation system model is established with the aid of (ANSYS/MAXWELL) software. The simulation results confirm that the rotor radial force is approximately zero and results from a balanced distribution of the magnetic flux density. The proposed DC excitation system is suitable to realize the rotor radial force cancellation in the bearingless BLDC motor. The simulation results of the proposed configuration show the approach of integrating winding configuration at different active pole positions to find the more efficient suspension performance and reduce the suspensions system current.

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Section: Cancellation Of Radial Force By Using All-suspension Polesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Radial force cancellation of bearingless brushless direct current motor using integrated winding configuration

Yousif

Mohammed

Ali

2022

IJEECS

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“…Sign the permeability of the BIM core and air gap as μ Fe and μ 0 , and the normal and tangential magnetic intensities at their interface are B n and H t, respectively. Since the magnetic force line is almost perpendicular to the circumference of the air gap, the Maxwell force d f 1 on the unit area of the rotor surface d A is [19–22]

normald f_{1} = \frac{μ_{Fe} - μ_{0}}{2 μ_{Fe} μ_{0}} (B_{n}^{2} + μ_{Fe} μ_{0} H_{normalt}) d A ≃ \frac{B_{n}^{2} d A}{2 μ_{0}}

Substitute

A = l r y

, formula (1) is turned into

normald f_{1} = \frac{l r B_{n}^{2} normald γ}{2 μ_{0}}

where l is the core length, r the rotor radius, and γ the space vector angle.…”

Section: Principle and Mathematical Model Of Suspension Force Basedmentioning

confidence: 99%

Analysis and optimisation of a bearingless induction motor's suspension force and unbalanced magnetic pulling force mathematical model

Yang

Ding

Sun

et al. 2020

IET Electric Power Applications

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Aiming at the problem that the two general mathematical models of suspension force and unbalanced magnetic pulling force (UMPF) are affected by the actual factors of a bearingless induction motor, a non‐linear model fitting method is proposed. Firstly, by finite element method (FEM), the coupling influence of the torque winding and suspension winding is taken into account, and the maximum voltage of the latter is obtained. Secondly, considering the motor magnetic saturation and combing the least squares method (LSM), the suspension force is estimated by a binary function. Similarly, considering the magnetic saturation and cogging effect, the UMPF is estimated by a ternary function. Finally, comparing the fitting precision under different orders, the two functions with their smallest errors are obtained, and the two original linear models are optimised, respectively. The theoretical study and experimental results show that the motor based on the optimised non‐linear model control system has a better suspension performance.

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“…Mehrdad Jafarboland et al proposed an analytical model of a bearingless motor for the calculation of radial forces in a bearingless surface-mounted permanent magnet synchronous motor at static rotor eccentricity. Based on the analysis of flux density harmonics, the effect of radial and tangential air-gap magnetic field components on the radial force was analysed [7]. An equivalent transformation method for calculating the radial electromagnetic force density of a surface-mounted type permanent magnet synchronous motor, at mixed eccentricity, is presented in Paper 8 [8].…”

Section: Introductionmentioning

confidence: 99%

Analysis and weakening of radial electromagnetic forces in high‐speed permanent magnet motors with external rotors based on shape functions

Teng

Zhang

et al. 2023

IET Electric Power Appl

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In this paper, a strategy of integrating direct-drive turbine compressors with high-speed permanent magnet external rotor motors is used to improve the problems of large footprint, low efficiency and high maintenance costs. The rotor of the motor will vibrate under the action of radial electromagnetic force when rotating, and under the action of high pressure and high speed gas, it may aggravate the rotor vibration. In the case of changing the original mechanical structure of the turbine, the vibration of the motor rotor needs to be analysed. In the paper, the radial electromagnetic force applied to the rotor is analysed. The influence of the order and size of the stator and rotor magnetic field harmonics on the size, frequency and order of the radial electromagnetic force wave is summarised. In order to weaken the radial electromagnetic force, this paper proposes a shape function about the magnetic pole size and designs a magnetic pole accordingly. The validity of the shape function was confirmed by comparing the radial electromagnetic force wave with a conventional, surface-mounted, built-in magnetic pole structure. Finally, based on the analysis of the rotor dynamics mode, the law of the effect of the change of the pole arc coefficient of the pole on the radial force was analysed using harmonic response, and reasonable conclusions were drawn.

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

Cited by 10 publications

References 28 publications

Radial force cancellation of bearingless brushless direct current motor using integrated winding configuration

Radial force cancellation of bearingless brushless direct current motor using integrated winding configuration

Analysis and optimisation of a bearingless induction motor's suspension force and unbalanced magnetic pulling force mathematical model

Analysis and weakening of radial electromagnetic forces in high‐speed permanent magnet motors with external rotors based on shape functions

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