Analytical Modeling and Finite-Element Computation of Radial Vibration Force in Fractional-Slot Permanent-Magnet Brushless Machines

Abstract-Radial force control in electrical machines has been widely investigated for a variety of bearingless machines as well as for conventional structures featuring mechanical bearings. This work takes advantage of the spatial distribution of the winding sets within the stator structure in Multi-Sector Permanent Magnet machine towards achieving a controllable radial force. An alternative force control technique for Multi-Sector Permanent Magnet machines is presented. The mathematical model of the machine and the theoretical investigation of the force production principle are provided. A novel force control methodology based on the minimization of the copper losses is described and adopted to calculate the d-q axis current references. The predicted performances of the considered machine are benchmarked against Finite Element Analysis. Experimental validation of the proposed control strategy is presented focusing on the suppression of selected vibration frequencies for different rotational speeds.

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“…is performed through the integration of the Maxwell stress tensor along the airgap circumference [25] and the results are compared in Fig. 8.…”

Section: B the Torque Capabilitymentioning

confidence: 99%

Radial Force Control of Multisector Permanent-Magnet Machines for Vibration Suppression

Valente

Papini

Formentini

et al. 2018

IEEE Trans. Ind. Electron.

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“…The influence of the stator slotting can be accounted for by introducing a complex relative airgap permeance based on the simplification of the actual slot shape being replaced by an ideal parallel slot [21,22]. …”

Section: Cogging Torquementioning

confidence: 99%

“…The influence of the stator slotting can be accounted for by introducing a complex relative air-gap permeance based on the simplification of the actual slot shape being replaced by an ideal parallel slot [21,22]. where λ a and λ b are the real and imaginary components of the relative complex air-gap permeance obtained by the conformal transformation and can be found in [22].…”

Section: Cogging Torquementioning

confidence: 99%

Design and Optimization of IPM Motor Considering Flux Weakening Capability and Vibration for Electric Vehicle Applications

Yin

Wei

et al. 2018

Sustainability

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Abstract:As motor design is key to the development of electric vehicles (EVs) and hybrid EVs (HEVs), it has recently become the subject of considerable interest. Interior permanent magnet (IPM) motors offer advantages such as high torque density and high efficiency, benefiting from both permanent magnet (PM) torque and reluctance torque. However an obvious disadvantage of IPM motors is that operation at high speed involves difficulties in achieving the required flux-weakening capability and low vibration. This study focuses on optimizing the flux-weakening performance and reducing the vibration of an IPM motor for EVs. Firstly, flux-weakening capability, cogging torque, torque ripple, and radical vibration force are analyzed based on the mathematical model. Secondly, three kinds of motors are optimized by the genetic algorithm and analyzed, providing visible insights into the contribution of different rotor structures to the torque characteristics, efficiency, and extended speed range. Thirdly, a slotted rotor configuration is proposed to reduce the torque ripple and radical vibration force. The flux density distributions are discussed, explaining the principle that motors with slotted rotors and stator skew slots have smaller torque ripple and radical vibration force. Lastly, the design and optimization results have been validated against experiments.

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“…In the past years, the research of slot harmonics and modulation effect are mainly focused on parasitic effects such as cogging torque [8] [9], torque ripple [10], unbalanced magnetic force [11] [12], noise and vibration [13] [14]. The influence of slotting modulation on the PM and rotor iron losses have also been investigated in [15]- [17].…”

Section: Introductionmentioning

confidence: 99%

Analysis of Air-Gap Field Modulation and Magnetic Gearing Effect in Fractional-Slot Concentrated-Winding Permanent-Magnet Synchronous Machines

Zhu

Liu

2018

IEEE Trans. Ind. Electron.

Self Cite

177

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Abstract-In this paper, the torque production of fractional slot concentrated winding (FSCW) permanent magnet synchronous machines (PMSM) are analyzed from the perspective of the air-gap field harmonics modulation accounting for slotting effect. It is found that the average torque of FSCW PMSM is produced by both the principle of conventional PMSM and the magnetic gearing effect. A finite element analysis (FEA)-based equivalent current sheet model and harmonic restoration method is firstly used in FSCW PM machines with different slot-pole number combinations to quantify the respective contribution of the conventional PMSM and the magnetic gearing effect to the average torque. The influence of slot opening on the magnetic gearing effect, cogging torque and torque ripple is analyzed. The results show that the magnetic gearing effect makes a non-ignorable contribution to the average torque when a large slot opening stator is used. The expression of the gear ratio in FSCW PMSMs is derived. The influence of gear ratio on the contribution of the magnetic gearing effect to the total torque is investigated by FEA. The FEA predicted torques are validated by experiments on the prototypes.

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Analytical Modeling and Finite-Element Computation of Radial Vibration Force in Fractional-Slot Permanent-Magnet Brushless Machines

Cited by 248 publications

References 33 publications

Radial Force Control of Multisector Permanent-Magnet Machines for Vibration Suppression

Radial Force Control of Multisector Permanent-Magnet Machines for Vibration Suppression

Design and Optimization of IPM Motor Considering Flux Weakening Capability and Vibration for Electric Vehicle Applications

Analysis of Air-Gap Field Modulation and Magnetic Gearing Effect in Fractional-Slot Concentrated-Winding Permanent-Magnet Synchronous Machines

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