Torque Distribution Characteristics of a Novel Double-Stator Permanent Magnet Generator Integrated with a Magnetic Gear

Mustafa, Shehu Salihu; Misron, Norhisam; Mariun, Norman; Othman, Mohammad Lutfi; Hanamoto, Tsuyoshi

doi:10.3390/en10010002

Cited by 4 publications

(6 citation statements)

References 32 publications

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“…To simplify Equations (10) and (12), an equation can be formed by relating the inner radius with the outer radius, as written in Equations (14) and (15).…”

Section: Relationship Of Design Parametersmentioning

confidence: 99%

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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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“…To simplify Equations (10) and (12), an equation can be formed by relating the inner radius with the outer radius, as written in Equations (14) and (15).…”

Section: Relationship Of Design Parametersmentioning

confidence: 99%

“…Besides using the MG for speed conversion of a motor, some researchers developed a new structure of MG with dual-iron ring which is integrated with a generator. The integration between the MG and generator produced higher power density for low-speed applications, such as wind turbine [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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“…where λ r0 and λ ppr are the average value and peak-to-peak value of the rotor permeance, respectively, p r is the number of rotor iron poles, θ r is the arc of single rotor iron pole, θ 0 and ω r are the initial mechanical angle and the mechanical angular velocity of the rotor. Thus, according to (8) and 9, the flux density in the inner airgap can be expressed as…”

Section: Harmonic Analysismentioning

confidence: 99%

“…Different from conventional PM machines, the armature windings of FMPM machines are connected according to one of the effective harmonic components with low pole-pair number and high speed. Thus, the rotation speed of armature reaction magnetic field is much higher than the rotor speed generally, so that the so called self-deceleration capability is realized [7,8], which can be expressed as…”

Section: Introductionmentioning

confidence: 99%

A Novel Triple-Permanent-Magnet-Excited Vernier Machine with Double-Stator Structure for Low-Speed and High-Torque Applications

Liu

Zhong

et al. 2018

Energies

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In this paper, a novel triple-permanent-magnet-excited vernier (TPMEV) machine with double-stator (DS) is proposed, of which the power density and the torque density are effectively improved to satisfy the operating requirements of low speed and high torque density for direct drive systems. Three sets of permanent magnets (PMs) are placed on the two stators and the rotor, respectively, and the magnetic fields excited by these PMs are modulated to effective magnetic field harmonics with low pole-pair numbers and high speeds based on bi-directional field modulation effect of the non-uniform airgap permeance. Then two sets of armature windings respectively accommodated in two stators are designed according to the effective magnetic field harmonics, thus achieving the coupling between the PM magnetic fields produced by three sets of PMs and armature windings. Firstly, the topology of the TPMEV-DS machine is introduced. Secondly, the airgap flux density of the machine is analyzed based on the equivalent magnetic circuit method, which proves the improvement potentiality of power density and torque density due to the bi-directional field modulation effect. Finally, the performance of the TPMEV-DS machine is calculated and analyzed by the finite element method, verifying the advantages of high power density and high torque density for the direct drive systems.

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“…Recent technological improvements and operational measures have been directed toward the design and topology optimization of magnetic gears in order to maximize the transmitted torque and power, as well as to reduce permanent magnets' usage [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31]. Magnetic field distributions determine the operational characteristics of MGs, such as the magnetic torque densities, losses, cogging and ripple torque, and efficiency [23].…”

Section: Introductionmentioning

confidence: 99%

Design Aspects of Conical Coaxial Magnetic Gears

2023

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In this paper, a new design of a conical coaxial magnetic gear was proposed. Conical magnetic gears are considered a logical link between the radial- and axial-field coaxial designs. The modeling of magnetic torques based on the 3D finite element method was developed. The design parameter variations of the conical coaxial magnetic gear were determined and discussed. The magnetic torque density was calculated and compared with that of a cylindrical coaxial magnetic gear with the same size and materials used. An optimal cone angle based on the air-gap length was proposed. Multistage conical coaxial magnetic gears were proposed as a sequence of coupled rotors with increased torque density and reduced magnetic reluctance. The proposed conical coaxial magnetic gears are more compact in size and suitable for integration with electrical machines and variable transmissions.

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Torque Distribution Characteristics of a Novel Double-Stator Permanent Magnet Generator Integrated with a Magnetic Gear

Cited by 4 publications

References 32 publications

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

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

A Novel Triple-Permanent-Magnet-Excited Vernier Machine with Double-Stator Structure for Low-Speed and High-Torque Applications

Design Aspects of Conical Coaxial Magnetic Gears

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