Performance Analysis of a Novel Triple-Permanent-Magnet- Excited Magnetic Gear and Its Design Method

Chen, Yiduan; Fu, Weinong; Li, Wei

doi:10.1109/tmag.2016.2522476

Cited by 18 publications

(6 citation statements)

References 11 publications

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“…In MGs, the flux-modulation poles serve to modulate the fundamental components of magnetic field to numbers of high-order harmonic components, which finally synchronize the low-speed rotor to produce a continuous positive thrust force. The rotating speed and pole pair numbers satisfy the following relationship [16,17] 0…”

Section: B Machine Structurementioning

confidence: 99%

A Novel Contra-Rotating Power Split Transmission System for Wind Power Generation and Its Dual MPPT Control Strategy

Luo

Niu

2017

IEEE Trans. Power Electron.

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This paper proposes a new brushless contra-rotating power split transmission (CR-PST) system for the direct-drive wind power generation. The core element of this system is a doubly-fed dual-rotor flux-modulation permanent magnet (PM) machine which has two contra-rotating rotors connected with two wind blades to absorb the wind energy, and two sets of stator windings to realize torque split between the two shafts. This proposed CR-PST system has compact structure and bidirectional flux modulation design, as well as increased wind power conversion efficiency. Compared with the conventional wind turbine system which can only work with single maximum power point tracking (MPPT) control strategy, the proposed CR-PST system can collect increased wind energy with dual MPPT method for the given wind speed. Time-stepping finite-element method (TS-FEM) is used to analyze the steady and dynamic performance of the proposed system and the control strategy is verified by experiments and simulation results.

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Section: B Machine Structurementioning

confidence: 99%

A Novel Contra-Rotating Power Split Transmission System for Wind Power Generation and Its Dual MPPT Control Strategy

Luo

Niu

2017

IEEE Trans. Power Electron.

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“…However, the yokeless structure leads to poor performance of MG inevitably with the removal of iron cores since it increases the magnetic reluctance and introduces a great leakage flux. For solving this problem, the papers [16][17][18][19] proposed the types of MGs with the Halbach PM array, focusing on the arrangement and design of it. A yokeless MG with Halbach PM array for lessening the reliance on iron cores is shown in Figure 1c compared with the conventional MG and yokeless MG shown in Figures 1a and 1b, which can reduce the leakage flux to some degree.…”

Section: Introductionmentioning

confidence: 99%

“…Magnetic gear (MG) provides the solution for replacing the mechanical gearbox in the electric vehicle propulsion system [1][2][3][4][5] for its inherent advantages of high transmission efficiency, overload protection, low working noise, and physical isolation [6][7]. To tap the potentials of industrial application, researchers focus on the MG, including radial-flux [8][9][10] MG, axial-flux MG [11,12], and magnetic-geared machines [13][14][15], for finding the better performance solutions. However, due to the limit of machine structures, all those MGs employ rotor iron cores to form the magnetic circuit and reduce the magnetic reluctance, which becomes the major weight of the machine.…”

Section: Introductionmentioning

confidence: 99%

Design and optimization of yokeless magnetic gear with asymmetric Halbach permanent magnet array for electric vehicle powertrain

Chen

Zhao

et al. 2022

IET Renewable Power Gen

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In this paper, a novel 3/27/24 (pole pairs of inner rotor permanent magnet [PM]s/modulator/outer rotor PMs) high torque density yokeless magnetic gear with asymmetric Halbach PM array is presented and optimized for electric vehicle powertrain. The key is to improve the torque performance by replacing the magnetic steel with the light nonmagnetic material as the rotor core and employing the embedded magnetic steel bar as well as trapezoidal PM structure to form a low magnetic resistance in the magnetic circuit. The proposed machine has significant performance improvements in two aspects. Firstly, it has high torque density and low iron loss with the yokeless structure. Secondly, it has a high anti-saturation capability and low torque ripple with the asymmetric Halbach PM array and the embedded magnetic steel bar. The proposed structure is optimized by the co-simulation of the finite-element method and C++ optimization software. For a clear evaluation, the proposed structure is compared with generalized solutions in terms of performance and cost. Comparison results indicate that the proposed solution has the highest output torque, torque density, and torque per PM weight among solutions, reaching 214.1 N⋅m, 58.2 N⋅m/kg, and 95.6 N⋅m/kg, which greatly enhances the performance of the magnetic gear.

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“…The triple permanent magnetic gear structure is introduced by Shan Peng [5], with improved magnetic energy density. Yiduan Chen [6] deployed additional permanent magnet (PM) poles in the stationary parts of the flux modulator, which acts like an extra magnetic gear for the same volume with increased transmitted torque. Another MG configuration that has been studied is the axial-type MG, which comprises a high-speed rotor, flux modulator, and low-speed rotor, which are all axially stacked to create an axial magnetic flux flow.…”

Section: Introductionmentioning

confidence: 99%

Simplified Design of Magnetic Gear by Considering the Maximum Transmission Torque Line

et al. 2020

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Magnetic gears (MGs) technology is studied widely among research institutions, with several improvements being documented. This development attracts a high amount of attention due to the demand in the development of magnetic gears towards higher performance than the conventional mechanical counterpart. In general, the design is complicated and there is a lack in detailed references for designing an MG for specific transmission torque as required by its application. Trial-and-error approaches have been the norm in achieving the desired torque by referring the existing MGs for the desired value of torque. This paper presents a new simplified approach towards designing an MG for the required torque and size by referring through a Maximum Transmission Torque Line (MTTL) reference. Finite element method (FEM) is used in analyzing randomly designed magnetic gears with various parameters towards the desired values of the MTTL. The proposed approach of MTTL is a new approach to estimate the total volume of permanent magnets (PMs) required for the MG to achieve the desired transmission torque. The reference line is used to generate equation relating the specific parameters of MG to develop the simplified design of MG based on the estimated total volume of PMs. This simplified way details to 8.5% of error in targeting the desired transmission torque, a means and way for the first stage of the MG design approach to reduce the conventional approaches.

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Performance Analysis of a Novel Triple-Permanent-Magnet- Excited Magnetic Gear and Its Design Method

Cited by 18 publications

References 11 publications

A Novel Contra-Rotating Power Split Transmission System for Wind Power Generation and Its Dual MPPT Control Strategy

A Novel Contra-Rotating Power Split Transmission System for Wind Power Generation and Its Dual MPPT Control Strategy

Design and optimization of yokeless magnetic gear with asymmetric Halbach permanent magnet array for electric vehicle powertrain

Simplified Design of Magnetic Gear by Considering the Maximum Transmission Torque Line

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