Dual Rotor Magnetically Geared Power Split Device for Hybrid Electric Vehicles

Magnetic‐geared double‐rotor machines are recognized as a promising power‐splitting component in hybrid electric aircrafts (HEAs). However, the high fuel efficiency speed of the turbine engine in HEAs is about 10,000 rpm, whereas conventional topologies suffer from low efficiency at high speed due to its specific operation principle—the magnetic field modulating principle. A coreless stator magnetic‐geared double‐rotor machine (CS‐MGDRM) is proposed to enhance high‐speed efficiency and thus comply with the operation condition of HEAs. First, the machine structure and hybrid propulsion system configuration are introduced, and power‐flow analysis of three basic operation modes is presented. Second, the operation principle of the machine is illustrated, and investigation of electromagnetic performances is carried out by finite element analysis. Third, an analytical model of the machine is developed, based on which the design optimization towards the maximum torque capacity is investigated. Furthermore, the loss distribution law and transmission efficiency are analysed and compared with conventional scheme, and the power factor characteristic is investigated as well. Finally, the overall performance of the proposed machine is evaluated.

\eta =\frac{{P}_{tur}}{{P}_{tur}+\sum {P}_{loss}}

where Σ P loss is the total loss consisting of the core loss, PM loss and copper loss.…”

Section: Loss and Efficiencymentioning

confidence: 99%

“…To replace the planetary gear unit, magnetic-geared double-rotor machines (MGDRMs) were proposed, with the merits of less noise and maintenance, and compact structure [6,7]. Moreover, the overload protection characteristic of MGDRMs could ensure reliability and safety, which is crucial for HEAs [8].…”

Section: Introductionmentioning

confidence: 99%

A high‐efficiency magnetic‐geared double‐rotor machine with the coreless stator for hybrid aircraft propulsion

Lang

Tong

Bai

et al. 2023

“…In ref. [145], an outer-stator radial-flux MGPM machine as shown in Figure 34 (a) is proposed to simplify the structure as shown in Figure 33a via including no PMs attached to the stator. In ref.…”

Section: Magnetically-geared Pm Machinementioning

confidence: 99%

A review on the field‐modulated magnetic gears: Development status, potential applications, and existent challenges

Yan,

Li,

Wang

et al. 2023

As a type of magnetic device being able to realize contact‐free power transmission together with sufficient volumetric torque density, the field‐modulated magnetic gear (FMMG) has become a promising alternative to the mechanical gear having rigid construction yet suffering lots of issues generated by the continuous teeth friction. The conventional magnetic gears (MGs) that behave as simple copies of their mechanical counterparts and can be roughly defined as origination of the FMMG are briefly introduced at first. Subsequently, the topology and material advancements proposed to improve operational performance of the FMMG are comprehensively summarised so as to clarify its current development status. Finally, potential applications of the FMMG due to its inherent advantages are compared against the existent challenges. The review aims to provide referable guidelines for researchers working at the field of high‐performance MGs.

“…With those involved topologies [1][2][3], these dual-rotor machines can transmit the input power through the two paths synchronously, that is, the mechanical-to-electrical power conversion path and mechanical-to-mechanical power transmission path. This function is welcome in the hybrid power transmission area, for example, the hybrid electric vehicles [4] and hybrid hydraulic system [5]. In those systems, the transmission devices extract the power from the internal combustion engine and split it into two portions, including a free mechanical shaft power output and an electrical power output.…”

Section: Introductionmentioning

confidence: 99%

Thermal analysis and temperature evaluation on a magnetic‐geared dual‐rotor machine

Tong,

Liu,

Sun

2024

The thermal performance of the magnetic‐geared dual‐rotor machine (MGDRM) is investigated. Because the effective component in the outer airgap magnetic field harmonics is low, the torque production of MGDRM cannot match the regular permanent magnetic synchronous machine (PMSM). Although the analysis shows that the torque generation of the MGDRM is weak, this conclusion is limited in the electromagnetic field. The MGDRM outer rotor should also be considered from the thermal aspect, and the effect on the torque generation should be valued in particular. The outer rotor thermal buffer effect blocks the heating flow from the winding to the inner rotor magnets. Thus, the MGDRM can withstand a heavy electrical load in a short period, producing higher torque. With this understanding, the torque production ability of the MGDRM can extend to a higher level, even close to the regular PMSM. To validate the analysis, a MGDRM machine is prototyped, and the dual‐rotor temperature information acquisition is realised by a wireless data collection. The rotor temperature estimation technology on the dual‐rotor is then investigated as an auxiliary function. The estimation error can be limited around 5°C, which is good for warning the thermal risk. And thus the MGDRM overheating can be safely adopted to extend the torque generation.