Torque Calculation of Five-Phase Interior Permanent Magnet Machine Using Improved Analytical Method

Liu, Guohai; Liu, Lu; Chen, Qian; Zhao, Wenxiang

doi:10.1109/tec.2018.2880574

Cited by 34 publications

(21 citation statements)

References 26 publications

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“…The stator contains two control circuits, as shown in Figure 1(b). One is a rotary coil with five phases [17][18][19][20][21][22] inserted in the stator slot. The other is a voice coil, which is defined as a linear coil.…”

Section: A Basic Model Of An Rl-svcm With Iron Flux Bridgesmentioning

confidence: 99%

A Rotary-Linear SPM Voice Coil Motor With PM Flux Bridges for Output Performance Improvement

Xing

Kwon

et al. 2021

IEEE Access

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This paper proposes a rotary-linear surface-mounted permanent magnet (PM) voice coil motor (RL-SVCM) with PM flux bridges in place of the iron flux bridges in a traditional RL-SVCM for enhancing average torque and force ripple but slight damage of torque ripple and average linear force. The iron flux bridges in a basic RL-SVCM cannot participate in the generation of rotary torque. In contrast, the PM flux bridges in the proposed RL-SVCM can participate in the generation of rotary torque. The magnetic equivalent circuit (MEC) is used to analyze the magnetic circuits of the basic and proposed models. The results explain the reasons for the performance improvements achieved by the proposed motor. The finite element method (FEM) is used to derive the precise output performance of the basic and proposed motors. Additionally, a prototype of the proposed RL-SVCM with PM flux bridges was manufactured for experimental verification. Close agreement between the experimental results and FEM results validates the feasibility of the proposed RL-SVCM.

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Section: A Basic Model Of An Rl-svcm With Iron Flux Bridgesmentioning

confidence: 99%

A Rotary-Linear SPM Voice Coil Motor With PM Flux Bridges for Output Performance Improvement

Xing

Kwon

et al. 2021

IEEE Access

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“…The width of the rotor teeth is 2ε 1 . Then, the relative air-gap permeance function can be obtained by (7) and (9), which can be shown in Fig. 6.…”

Section: B Air-gap Flux Densitymentioning

confidence: 99%

“…However, it cannot reveal the principle of torque ripple reduction well, and the computation cost of FEM is very high. Hence, analytical methods (AMs) are proposed to reveal the mechanism of torque and the reduction of torque ripple [7] because AMs are beneficial to build the relationship between the parameters and the torque performance. Various AMs are put forward to evaluate torque and torque ripple, such as the Maxwell Stress Tensor [8]- [10], the winding function theory [11], [12] and the Lorentz force law [13]- [15].…”

Section: Introductionmentioning

confidence: 99%

Torque calculation of five-phase synchronous reluctance motors with shifted-asymmetrical-salient-poles under saturation condition

Chen

Shi

et al. 2020

Trans. Electr. Mach. Syst.

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In traditional analytical method (AM), the magnetic saturation is always ignored to simplify the calculation process. However, synchronous reluctance motors (SynRMs) often operate around saturation point to achieve higher torque density. Therefore, a new AM is proposed, in which the saturation of stator iron has been considered. The key of the proposed method includes a saturation factor, and an iterative method is adopted to compute the saturation factor in the SynRM by increasing the air-gap length. Especially, the proposed AM can be applied to a SynRM even with shifted-asymmetrical-salient-poles. In the process of AM, the expression of stator magnetomotive force (MMF) is built firstly. Additionally, the air-gap density including slotting effect and salient-poles is calculated. Then, the rotor MMF under saturation of the stator iron is obtained. Therefore, the precision of the instantaneous torque can be improved significantly. Eventually, by the verification of finite elements method (FEM) and experiments, the torque performance of SynRMs with shifted asymmetrical rotor can be predicted accurately by the proposed AM.

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“…where R s3 is the radius of the stator bore. The flux density in magnetic bridge region is at a high level of saturation on the B-H curve of the silicon steel, the relative permeability µ r1 and µ r2 can be assumed as a small constant where the flux density is 2.1T [3], [4], [29]. The leakage magnetic permeance G mb1 , and G mb2 in III and IV regions can be calculated by:…”

Section: Rotor Magnetic Circuit Modelmentioning

confidence: 99%

Analytical Model of Torque-Prediction for a Novel Hybrid Rotor Permanent Magnet Machines

Liu

Gao

et al. 2019

IEEE Access

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This paper presents an analytical method for predicting the electromagnetic performance in permanent magnet (PM) machine with the spoke-type rotor (STR) and a proposed hybrid rotor structure (HRS), respectively. The key of this method is to combine magnetic field analysis model (MFAM) with the magnetic equivalent circuit model. The influence of the irregular PM shape is considered by the segmentation calculation. To obtain the boundary condition in the MFAM, respectively, two equivalent methods on the rotor side are proposed. In the STR, the average flux density of the rotor core outer-surface is calculated to solve the Laplace's equation with considering for the rotor core outer-surface eccentric. In the HRS, based on the Thevenin's theorem, the equivalent parameters of PM remanence B reB and thickness h pme are obtained as a given condition, which can be utilized to compute the air-gap flux density by conventional classic magnetic field analysis model of surface-mounted PMs with air-gap region. Finally, the proposed analytical models are verified by the finite element analysis (FEA) with comparisons of the air-gap flux density, flux linkage, back-EMF and electromagnetic torque, respectively. Furthermore, the performance that the machine with the proposed hybrid structure rotor can improve the torque density as explained. INDEX TERMS Analytical method, hybrid PM rotor structure, rotor core outer-surface eccentric, magnetic equivalent circuit model (MECM).

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Torque Calculation of Five-Phase Interior Permanent Magnet Machine Using Improved Analytical Method

Cited by 34 publications

References 26 publications

A Rotary-Linear SPM Voice Coil Motor With PM Flux Bridges for Output Performance Improvement

A Rotary-Linear SPM Voice Coil Motor With PM Flux Bridges for Output Performance Improvement

Torque calculation of five-phase synchronous reluctance motors with shifted-asymmetrical-salient-poles under saturation condition

Analytical Model of Torque-Prediction for a Novel Hybrid Rotor Permanent Magnet Machines

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