Design of an Effective Double-Rotor Machine with Robust Mechanical Structure

Hong, Zhao; Liu, Chunhua

doi:10.1109/apmrc.2018.8601067

Cited by 2 publications

(1 citation statement)

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“…In addition, the AlNiCo material and magnetising windings are adopted to realise the gear‐ratio variation in [7]. Besides, to enhance the flux‐weakening ability of MGDRM, a consequent pole and inserted permanent magnet (PM) structure are discussed in [8]. Moreover, PMs are inserted into the gap of modulator to increase the torque density or interact with extra windings in [9, 10].…”

Section: Introductionmentioning

confidence: 99%

Analytical model for magnetic‐geared double‐rotor machines and its d–q ‐axis determination

Hong

Liu

Song

et al. 2020

IET Electric Power Applications

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This paper presents an analytical subdomain model for the prediction of various electromagnetic parameters of magnetic-geared double-rotor machine (MGDRM). By dividing the MGDRM into six subdomains and solving the Maxwell equations in polar coordinates for each region, the vector magnetic potential distribution can be derived. Subsequently, the flux density distribution, back electromotive force (EMF), and output torque, can be calculated. Furthermore, based on the proposed model, the equivalent d-q axis is elaborated. Also, the corresponding d and q inductance can be obtained. It proves that the MGDRM can be regarded as a non-salient-pole synchronous machine. Besides, the power factor of the MGDRM under i d =0 control is deduced and optimized for the different thicknesses of modulators. In addition, the demagnetization capability is analysed by adopting the subdomain model. Finally, the accuracy of proposed subdomain model for MGDRMs is validated via the finite-element method (FEM). Nomenclature A z Vector magnetic potential. B r , B θ Radial and tangential component of magnetic flux density. M , J Magnetization vector of magnets, Current density vector. μ 0 Magnetic permeability of vacuum. P, Q Number of stator slots and modulator pieces. P i Pole pair Number of inner rotor permanent magnets (PMs). β, γ, δ Modulator opening angle, stator slot width angle and slot opening angle. φ 0 , θ 0 Initial circumferential position of the inner rotor and modulator. θ i , θ j , J l Circumferential positions of PMs, i th modulator opening and j th slot opening, current density in the l th slot

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Section: Introductionmentioning

confidence: 99%