Abstract
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-Modulating-Ring 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.
Highlights
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).[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.[3,4]
The modulating ring of the IMR-BDRM is designed as square shape, while that of the SPMR-BDRM is designed as wavy shape to restrain the harmonic magnetic fields in the air gap
Summary
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).[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. Some researchers have proposed another MFM-BDRM,[5,6] named Interior-Modulating-Ring Brushless Double-Rotor Machine (IMR-BDRM), putting the modulating ring rotor inside and connecting the magnetic blocks to the rotor core together. Since the magnetic blocks and the rotor core are combined to a whole, the mechanical problem of the modulating ring is solved. In this paper, a new MFMBDRM with sinusoidal-permeance modulating ring named Sinusoidal-Permeance-Modulating-Ring Brushless Double-Rotor Machine (SPMR-BDRM) is proposed to solve the problem of poor mechanical strength and large iron loss
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