Abstract
The exact mathematical modeling of electric machines has always been an effective tool for scholars to understand the working principles and structure requirements of novel machine topologies. This paper provides an analytical modeling method—the harmonic modeling method (HMM)—for two types of consequent-pole magnetic-geared machines, namely the single consequent-pole magnetic-geared machine (SCP-MGM) and the dual consequent-pole magnetic-geared machine (DCP-MGM). By dividing the whole machine domain into different ring-like subdomains and solving the Maxwell equations, the magnetic field distribution and electromagnetic parameters of the two machines can be obtained, respectively. The two machines were applied in the propulsion systems of hybrid electric vehicles (HEVs). The electromagnetic performances of two machines under different operating conditions were also compared. It turns out that the DCP-MGM can reach a larger electromagnetic torque compared to that of the SCP-MGM under the same conditions. Finally, the predicted results were verified by the finite element analysis (FEA). A good agreement can be observed between HMM and FEA. Furthermore, HMM can also be applied to the mathematical modeling of other consequent-pole electric machines in further study.
Highlights
The last decade has witnessed rapid developments of magnetic gears (MGs) and electric machines that utilize the magnetic-gearing effect, which are called magnetic-geared machines (MGMs) [1,2,3].Ever since their invention in 2001 [4], MGs have become a research hotspot due to their high efficiency and self-protection characteristics [5,6,7].The concept of MGMs is derived from MGs
When the MGM is applied in hybrid electric vehicles (HEVs), its inner rotor can be connected to the internal combustion engine (ICE), while the outer rotor can be connected to a permanent magnet synchronous machine (PMSM), which will be further connected to the differential to drive the wheels; the battery provides energy to the windings of both the MGM and permanent magnet synchronous machines (PMSMs) via an inverter
Since this paper mainly focuses on the operating modes of the CP-MGM, it is Energies 2019, 12, x FOR that reasonable to assume is no power flow between the PMSM and the outer rotor shaft at the four steady states mentioned in this paper
Summary
The last decade has witnessed rapid developments of magnetic gears (MGs) and electric machines that utilize the magnetic-gearing effect, which are called magnetic-geared machines (MGMs) [1,2,3]. The ICE can always work at its highest efficiency to save fuel by alternating the working modes of the electric machine This application scenario has drawn more and more attention as environmental problems become severe [17]. The rare earth elements make the price of PMs extremely expensive [21] To solve this problem, a consequent-pole structure can be adopted. The MGMs offer many new possibilities for electric machines, their magnetic field distribution is much more complex compared to traditional electric machines with one rotor. Research [31] has proposed a new harmonic modeling method (HMM) to calculate the magnetic distribution of electric machines.
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