Analyze of permanent magnet loss of high speed permanent magnet synchronous motor for flywheel energy storage system

Wang, Geng Ji; Wang, Ping; Wang, Xiao Yuan

doi:10.1109/asemd.2015.7453699

Cited by 3 publications

(2 citation statements)

References 2 publications

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“…According to the Maxwell equations, the relationship between the eddy-current voltage E and the transducer magnetic flux density B on the rotor surface near the transducer poles is [16] E(t,x0,y0)=normald∫∫italicB(italict,italicx,italicy)normalditalicxnormalditalicynormalditalict=Ieddy(t,x0,y0)Rr where Ieddy(t,x,y) is the eddy current in the rotor and Rr is the rotor resistance. B can be resolved by Fourier decomposition:B=∑n=1∞(αncosnωnt+βnsinnωnt).…”

Section: Anisotropic Surface Conductivity Of the Rotormentioning

confidence: 99%

Theoretical and Experimental Analysis on the Influence of Rotor Non-Mechanical Errors of the Inductive Transducer in Active Magnetic Bearings

Zhou

et al. 2018

Sensors

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Inductive transducers are widely applied to active magnetic bearings (AMBs). However, when the rotor rotates at a high speed, the rotor defects will affect the measuring signal (the magnetic field generated by transducer coils) and then reduce the transducer measuring accuracy. The rotor in AMBs is assembled with laminations, which will result in rotor non-mechanical errors. In this paper, rotor non-mechanical errors, including the anisotropic internal permeability and anisotropic surface conductivity, and their influence on double-pole variable-gap inductive transducers are explored in depth. The anisotropic internal permeability will affect the transducer measuring accuracy and bring about 1.3±0.1% measurement error. The anisotropic surface conductivity leads to different eddy currents around the rotor, influences the equivalent reluctance of the magnetic circuit, and then affectsthe transducer measuring accuracy. The experiments prove that rotor non-mechanical errors have a significant influence on transducer measurement accuracy, and the reduction of the transducer excitation frequency can reduce the measurement error and improve the AMB control performance.

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Section: Anisotropic Surface Conductivity Of the Rotormentioning

confidence: 99%

Theoretical and Experimental Analysis on the Influence of Rotor Non-Mechanical Errors of the Inductive Transducer in Active Magnetic Bearings

Zhou

et al. 2018

Sensors

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“…Compared with traditional motors, the losses per volume and the working temperature rise of HSPMSMs are significantly increased. Especially, the rotor losses caused by the high-frequency magnetic field aggravate the rotor temperature rise [8][9][10][11][12]. Because permanent magnets (PM) in the rotor of the high-speed motor have a non-negligible conductivity, eddy current losses are generated in the high-frequency harmonic magnetic field, leading to more severe temperature rise.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design of the Rotor Structure of a HSPMSM Based on Analytic Calculation of Eddy Current Losses

Liang

Liu

2017

Energies

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Abstract:The rotor eddy current losses of a high-speed permanent magnet synchronous motor reduce the efficiency of the motor and increase the temperature rise of the rotor. In severe cases, the permanent magnet of the rotor can be demagnetized, affecting the safe operation of the motor. In this paper, an analytical model of rotor eddy current losses calculation based on Maxwell equations is introduced. The eddy current losses of rotor structures, e.g., protection sleeve, shield layer and permanent magnets, are analyzed. The calculation results of rotor eddy current losses are compared with two-dimensional (2D) finite element analysis. The comparison verifies the accuracy and versatility of analytical calculation. Finally, the influences of the variables on eddy current losses in the derived model are analyzed. Based on the principle of minimizing eddy current losses, an optimized structure with copper layers covering both inner and outer surfaces of the protective sleeve is proposed. Furthermore, the optimized distribution parameter of copper film thickness is obtained.

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Iron loss analysis of permanent magnet segmentation in FSCW permanent magnet synchronous machine

Wang

2021

2021 IEEE 2nd China International Youth Conference on Electrical Engineering (CIYCEE)

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Analyze of permanent magnet loss of high speed permanent magnet synchronous motor for flywheel energy storage system

Cited by 3 publications

References 2 publications

Theoretical and Experimental Analysis on the Influence of Rotor Non-Mechanical Errors of the Inductive Transducer in Active Magnetic Bearings

Theoretical and Experimental Analysis on the Influence of Rotor Non-Mechanical Errors of the Inductive Transducer in Active Magnetic Bearings

Optimal Design of the Rotor Structure of a HSPMSM Based on Analytic Calculation of Eddy Current Losses

Iron loss analysis of permanent magnet segmentation in FSCW permanent magnet synchronous machine

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