A Novel Dual-Permanent-Magnet-Excited Machine with Flux Strengthening Effect for Low-Speed Large-Torque Applications

Shi, Yujun; Jian, Linni

doi:10.3390/en11010153

Cited by 22 publications

(10 citation statements)

References 32 publications

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“…Therefore, the PAMPM for the DPME machine is not suitable for high-precision calculation but is useful for EM designers to recognize and quantify AFDHs that make a negative contribution to the generation of back-EMF at the beginning of EM design and then optimize the DPME machine better. 6) Comparing the analytical result to the FEM and measured results, the errors are 8.7% and 16.7%, respectively. Therefore, the PAMPM is not suitable for high-precision calculations.…”

Section: Experimental Testmentioning

confidence: 95%

“…Benefiting from the "magnetic gearing effect", permanentmagnet vernier machines (PMVMs) have the inherent advantage of high torque density and can directly drive the load without the help of intermediate transmission devices such as mechanical gearboxes, thus making PMVMs outstanding candidates for direct drive applications [1][2][3][4][5][6]. To date, various topologies have been proposed for PMVMs with high performance.…”

Section: Introductionmentioning

confidence: 99%

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Quantitative Analysis of Back-EMF of a Dual-Permanent-Magnet-Excited Machine: Alert to Flux Density Harmonics Which Make a Negative Contribution to Back-EMF

Shi

Zhong

Jian³

2021

IEEE Access

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Recently, the dual-permanent-magnet-excited (DPME) machine has attracted growing attention due to its high torque density. Due to the bidirectional field modulated effect (BFME), airgap flux density harmonics (AFDHs) are more complex and abundant than traditional permanent magnet synchronous machines (PMSMs). Moreover, the back-electromotive force (EMF) generated by AFDHs is also complex. Unfortunately, only a few papers qualitatively analyze back-EMF. The qualitative analysis for back-EMF can reveal some important conclusions; for example, only AFDHs meeting specific pole pair numbers (PPNs) can generate back-EMF. However, it may also ignore some details and valuable findings. In this paper, a purely analytical magnetomotive force (MMF) permeance model (PAMPM) for a DPME machine is built to quantitatively analyze the back-EMF. The PAMPM does not require a numerical method, such as conformal transformation. With the PAMPM, AFDHs that contribute to the generation of back-EMF can be recognized and quantified. Interestingly, AFDHs with m2p2=np3 cause PM flux-linkage to have a dc bias, and not all AFDHs play a positive role in the generation of back-EMF. The main recognition results are as follows: 1) the S-II and R-II types of AFDHs in a 12/10 DPME machine overall make a negative contribution to the generation of back-EMF; and 2) AFDHs with PPN=22 in the two types mainly cause a negative contribution. To further verify the above results, 2D finite element simulation and experimental tests of a prototype machine are also conducted.

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Section: Experimental Testmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Quantitative Analysis of Back-EMF of a Dual-Permanent-Magnet-Excited Machine: Alert to Flux Density Harmonics Which Make a Negative Contribution to Back-EMF

Shi

Zhong

Jian³

2021

IEEE Access

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“…It can be observed that both the input voltage and output current are not standard sine waves. In order to get the power factor (PF), Fast Fourier Transformation (FFT) is used to calculate the phase angle difference (PF angle) between the two waveforms [32]. Hence, the PF angle is 36.32 degrees, which means that the PF is about 0.81.…”

Section: Rotation Speed 2500 R/min Turns Of Each Coil 110mentioning

confidence: 99%

A Novel Transverse Flux Permanent Magnet Disk Wind Power Generator with H-Shaped Stator Cores

et al. 2018

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This paper presents a novel transverse flux permanent magnet disk generator (TFPMDG) for wind power generation. The main features of its structure are the modular H-shaped stator cores and two simple rotor disks. What is different from the structures introduced in the references is that each H-shaped stator core is formed by two T-shaped iron cores and a permanent magnet (PM) rather than a complete H-shaped core, which makes the manufacturing simpler and easier. Each rotor disk consists of a rotor holder and several rotor bars, resulting in high robustness and reliability. Moreover, two circular coils in the H-shaped stator cores together with the stator disk are sandwiched by the two rotor disks, which improves the utilization of PMs. In this paper, the proposed TFPMDG is investigated in detail. Firstly, the structure and operating principle are introduced. Then, the magnetic circuit method is used to analyze the TFPMDG. Next, the three-dimensional (3D) finite element method (FEM) is employed to compute the magnetic field distribution and EMF at no load. According to the calculation result, the other three TFPMDGs with different shapes of rotor cores are proposed and analyzed for better back EMF, and then a generator with good performance is selected for load analysis. Finally, a prototype is fabricated and tested, and the simulated results are compared with the measured ones, which proves the rationality of the simulated results.

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“…Due to the co-existence of dual PM sources, the design of the PM layout becomes relatively flexible, especially for the stator PM source. The existing literature usually adopts PMs alternately mounted on stator teeth to form a consequent-pole stator PM source [28][29][30], which results in weak torque generation at the stator side due to its biased flux feature. In addition, the flux weakening mechanism based on controlling stator PMs creates a fundamental contradiction between the flux weakening range and demagnetization risk, especially considering the weak power contribution of the stator PM source.…”

Section: Introductionmentioning

confidence: 99%

A Novel Dual-Structure Parallel Hybrid Excitation Machine for Electric Vehicle Propulsion

Zhang¹,

Zhao

Niu

2019

Energies

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Magnetic field regulation is a difficult and long-existing issue in surface-mounted permanent magnet synchronous machines (PMSMs). To produce effective and efficient flux regulation for PMSMs, a new topology, named a dual-structure parallel hybrid excitation machine (DS-PHEM), is presented in this paper. In this machine, the rotating permanent magnet (PM) excitation and stationary DC field excitation are artificially arranged and designed at the inner and outer magnetic circuits, respectively. Therefore, a decoupling and parallel feature is obtained between two excitation sources. This machine integrates the merits of a brushless structure and theoretically infinite constant power range, as well as zero risk of demagnetization. In this paper, the machine configuration is introduced, mainly focusing on some important design criteria for electromagnetic integration, and the operating principles of flux control are also analyzed in detail. To further verify the feasibility of the proposed scheme, the overall electromagnetic performance of the proposed DS-PHEM is evaluated by using the time-stepping finite-element method.

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A Novel Dual-Permanent-Magnet-Excited Machine with Flux Strengthening Effect for Low-Speed Large-Torque Applications

Cited by 22 publications

References 32 publications

Quantitative Analysis of Back-EMF of a Dual-Permanent-Magnet-Excited Machine: Alert to Flux Density Harmonics Which Make a Negative Contribution to Back-EMF

Quantitative Analysis of Back-EMF of a Dual-Permanent-Magnet-Excited Machine: Alert to Flux Density Harmonics Which Make a Negative Contribution to Back-EMF

A Novel Transverse Flux Permanent Magnet Disk Wind Power Generator with H-Shaped Stator Cores

A Novel Dual-Structure Parallel Hybrid Excitation Machine for Electric Vehicle Propulsion

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