Back EMF Harmonic Analysis of Permanent Magnet Magnetic Geared Machine

Ren, Xiang; Li, Dawei; Qu, Ronghai; Pei, Tonghao

doi:10.1109/tie.2019.2938484

Cited by 31 publications

(13 citation statements)

References 19 publications

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“…When the CP-MGM operates as a power split machine, the speeds of the inner rotor and outer rotor are variable. Moreover, it was found that the amplitudes and orders of back EMF harmonics are variable with rotor speeds in MGMs [18]. Therefore, the most essential quantity to reflect back EMF harmonic is the flux linkage component.…”

Section: B Optimization Of Back Emf Waveformsmentioning

confidence: 99%

“…However, different flux linkage components may have the same frequency under certain operating conditions, owing to the dual mechanicalport structure. Thus, the flux linkage separation method presented in [18] is employed here to identify the specific flux linkage harmonics that lead to back EMF distortion.…”

Section: B Optimization Of Back Emf Waveformsmentioning

confidence: 99%

“…Owing to its special operating principle, i.e., magnetic gearing effect, as well as dual mechanical-port structure, the performance characteristics of MGMs are quite different from that of conventional permanent magnet synchronous machines (PMSMs) [14]. Thus, the pole-pair combinations [15], [16], winding configurations [17], back electromotive force (EMF) harmonic characteristics [18], wide speed range operation [19], [20], and performance characteristics during overload conditions [21] have been investigated. In order to further improve the compactness and torque density of MGMs, the bidirectional flux-modulation effect, which integrates two flux modulation groups into one machine, was introduced [22].…”

Section: Introductionmentioning

confidence: 99%

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A Consequent-Pole Magnetic-Geared Machine With Axially Embedded Permanent Magnets for Hybrid Electric Vehicle

et al. 2021

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This paper reveals the fundamental reason for the asymmetrical issue in magnetic-geared machines (MGMs) based on flux modulation theory. The analysis indicates that the magnetic circuits of three-phase windings in MGMs are inherently asymmetrical. This asymmetrical issue is even more severe in conventional consequent-pole MGMs (CP-MGMs) because of the more distorted magnetic field. Hence, to address the asymmetrical issue, a novel structure featuring enhanced harmonic elimination capability is proposed in this paper. Consequently, torque density can also be improved. In particular, the proposed CP-MGM employs modular structure and axially embedded permanent magnets (PMs) to achieve symmetrical back electromotive force (EMF) waveforms and improved torque capability, respectively. To further improve the electromagnetic performance of the proposed CP-MGM, the PM arc ratio and flux modulator width ratio are analytically designed, which provides a general design guideline for CP-MGMs. To illustrate the merits of the proposed CP-MGM, a few other MGMs are included for a fair comparison based on finite element analysis (FEA). Results show the proposed CP-MGM can achieve more symmetrical back EMF waveforms and lower torque ripple, as well as lower PM consumption and higher torque density, as compared with its MGM counterparts.INDEX TERMS Asymmetrical magnetic circuit, cost-effective, high torque density, magnetic-geared machine.

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Section: B Optimization Of Back Emf Waveformsmentioning

confidence: 99%

Section: B Optimization Of Back Emf Waveformsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A Consequent-Pole Magnetic-Geared Machine With Axially Embedded Permanent Magnets for Hybrid Electric Vehicle

et al. 2021

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“…Back-EMF is a key physical quantity in electrical machines (EMs), which designers always concern [32]. For the DPME machine (see Fig.…”

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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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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“…For many years, the clamping force control strategy typically adopts the safety factor method, and the system is multiplied by a constant factor to satisfy CVT operation under any working conditions. However, while driving, this fixed control range cannot •3• meet real-time road conditions and increases the wear between friction pairs [9].…”

Section: Introductionmentioning

confidence: 99%

Optimization Transmission Efficiency with Driver Intention for Automotive Continuously Variable Transmission Under Slip Mode

Han

Zhang

Fang

et al. 2020

Preprint

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This study proposes and experimentally validates an optimal integrated system to control the automotive continuously variable transmission (CVT) to achieve its expected transmission efficiency range. The control system framework consists of top and bottom layers. In the top layer, a driving intention recognition system is designed on the basis of fuzzy control strategy to determine the relationship between the driver intention and CVT target ratio at the corresponding time. In the bottom layer, a new slip state dynamic equation is obtained considering slip characteristics and its related constraints, and a clamping force bench is established. Innovatively, a joint controller based on model predictive control (MPC) is designed taking internal combustion engine torque and slip between the metal belt and pulley as optimization dual targets . A cycle is attained by solving the optimization target to achieve optimum engine torque and the input slip in real-time . Moreover, the new controller provides good robustness. Finally, performance is tested by actual CVT vehicles. Results show that compared with traditional control, the proposed control improves vehicle transmission efficiency by approximately 9.12%–9.35% with high accuracy.

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Back EMF Harmonic Analysis of Permanent Magnet Magnetic Geared Machine

Cited by 31 publications

References 19 publications

A Consequent-Pole Magnetic-Geared Machine With Axially Embedded Permanent Magnets for Hybrid Electric Vehicle

A Consequent-Pole Magnetic-Geared Machine With Axially Embedded Permanent Magnets for Hybrid Electric Vehicle

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

Optimization Transmission Efficiency with Driver Intention for Automotive Continuously Variable Transmission Under Slip Mode

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