Investigation of a Novel Radial Magnetic-Field-Modulated Brushless Double-Rotor Machine Used for HEVs

Abstract:The paper presents a number of advanced solutions on electric machines and machine-based systems for the powertrain of electric vehicles (EVs). Two types of systems are considered, namely the drive systems designated to the EV propulsion and the power split devices utilized in the popular series-parallel hybrid electric vehicle architecture. After reviewing the main requirements for the electric drive systems, the paper illustrates advanced electric machine topologies, including a stator permanent magnet (stator-PM) motor, a hybrid-excitation motor, a flux memory motor and a redundant motor structure. Then, it illustrates advanced electric drive systems, such as the magnetic-geared in-wheel drive and the integrated starter generator (ISG). Finally, three machine-based implementations of the power split devices are expounded, built up around the dual-rotor PM machine, the dual-stator PM brushless machine and the magnetic-geared dual-rotor machine. As a conclusion, the development trends in the field of electric machines and machine-based systems for EVs are summarized.

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“…This relationship is very similar to Equation (2), which means that the MGDRM might be a potential replacement for the THS [70,71]. Figure 24.…”

Section: Dual-rotor Magnetic-geared Brushless Ecvtsupporting

confidence: 61%

Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

et al. 2015

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“…When l ≠ 0, the number of pole pairs in the magnetic field distribution and the corresponding rotational speed are shown in Equations (19) and (20) …”

Section: Principle Of Operationmentioning

confidence: 99%

“…To solve the above problems, a novel brushless double rotor permanent magnet machine based on the principle of magnetic-field modulation is presented in this paper. The axial magnetic-field-modulated brushless double rotor machine (MFM-BDRM) comprizes three parts: a stator, a modulating ring rotor and a permanent magnet rotor [18,19]. The modulating ring rotor, composed of evenly distributed ferromagnetic pole pieces and nonmagnetic pole pieces, is sandwiched between the stator and the permanent magnet rotor [20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Research on an Axial Magnetic-Field-Modulated Brushless Double Rotor Machine

et al. 2013

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Double rotor machine, an electronic continuously variable transmission, has great potential in application of hybrid electric vehicles (HEVs), wind power and marine propulsion. In this paper, an axial magnetic-field-modulated brushless double rotor machine (MFM-BDRM), which can realize the speed decoupling between the shaft of the modulating ring rotor and that of the permanent magnet rotor is proposed. Without brushes and slip rings, the axial MFM-BDRM offers significant advantages such as excellent reliability and high efficiency. Since the number of pole pairs of the stator is not equal to that of the permanent magnet rotor, which differs from the traditional permanent magnet synchronous machine, the operating principle of the MFM-BDRM is deduced. The relations of corresponding speed and toque transmission are analytically discussed. The cogging toque characteristics, especially the order of the cogging torque are mathematically formulated. Matching principle of the number of pole pairs of the stator, that of the permanent magnet rotor and the number of ferromagnetic pole pieces is inferred since it affects MFM-BDRM's performance greatly, especially in the respect of the cogging torque and electromagnetic torque ripple. The above analyses are assessed with the three-dimensional (3D) finite-element method (FEM).

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“…1,2 Its modulating ring rotor, which is formed by the alternant placement of magnetic and non-magnetic blocks, is set in the middle of the stator and the PM rotor. Due to rich harmonic magnetic fields in the air gap, the silicon steel sheet material is a preferable selection for the magnetic blocks to reduce iron loss.…”

Section: Introductionmentioning

confidence: 99%

Research on a new magnetic-field-modulated brushless double-rotor machine with sinusoidal-permeance modulating ring

et al. 2017

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ARTICLES YOU MAY BE INTERESTED INResearch on a novel axial-flux magnetic-field-modulated brushless double-rotor machine with low axial force and high efficiency AIP Advances 7, 056668 (2017) The magnetic-field-modulated brushless double-rotor machine (MFM-BDRM), composed of a stator, a modulating ring rotor, and a PM rotor, is a kind of power-split device for hybrid electric vehicles (HEVs). In this paper, a new MFM-BDRM with sinusoidal-permeance modulating ring named Sinusoidal-Permeance-ModulatingRing Brushless Double-Rotor Machine (SPMR-BDRM) is proposed to solve the problem of poor mechanical strength and large iron loss. The structure and the operating principle of the MFM-BDRM are introduced. The design principle of the sinusoidal-permeance modulating ring is analyzed and derived. The main idea of that is to minimize the harmonic permeance of air gap, thereby the harmonic magnetic fields can be restrained. There are comparisons between a MFM-BDRM with sinusoidal-permeance modulating ring and a same size MFM-BDRM with traditional modulating ring, including magnetic field distributions and electromagnetic performances. Most importantly, the iron losses are compared under six different conditions. The result indicates that the harmonic magnetic fields in the air gap are restrained; the electromagnetic torque and power factor are almost the same with same armature current; the torque ripples of the modulating ring rotor and the PM rotor are reduced; the stator loss is reduced by 13% at least and the PM loss is reduced by 20% at least compared with the same size traditional MFM-BDRM under the same operating conditions. © 2017 Author (s)

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Investigation of a Novel Radial Magnetic-Field-Modulated Brushless Double-Rotor Machine Used for HEVs

Cited by 69 publications

References 19 publications

Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

Advanced Electrical Machines and Machine-Based Systems for Electric and Hybrid Vehicles

Research on an Axial Magnetic-Field-Modulated Brushless Double Rotor Machine

Research on a new magnetic-field-modulated brushless double-rotor machine with sinusoidal-permeance modulating ring

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