Abstract
Multiphase machines have some distinct merits, including the high power density, high torque density, high efficiency and low torque ripple, etc. which can be beneficial for many industrial applications. This paper presents four different types of six-phase outer-rotor permanent-magnet (PM) brushless machines for electric vehicles (EVs), which include the inserted PM (IPM) type, surface PM (SPM) type, PM flux-switching (PMFS) type, and PM vernier (PMV) type. First, the design criteria and operation principle are compared and discussed. Then, their key characteristics are addressed and analyzed by using the finite element method (FEM). The results show that the PMV type is quite suitable for the direct-drive application for EVs with its high torque density and efficiency. Also, the IPM type is suitable for the indirect-drive application for EVs with its high power density and efficiency.
Highlights
In recent years, interest in electrical vehicles (EVs) is growing rapidly driven by the concerns about environment issues [1,2]
This paper is focused on four different types of six-phase outer-rotor PM machines, which are suitable for EV applications
These four types of machines combine the advantages of PM machines and multiphase machines, achieving high power density, high torque density, better fault tolerance capability, and lower torque ripple
Summary
Interest in electrical vehicles (EVs) is growing rapidly driven by the concerns about environment issues [1,2]. It is capable of achieving a high electric frequency at low rotation speed [14] It always adopts a concentric winding layout in order to have short end windings, which is more suitable for the limited space of EVs., The general advantages and disadvantages of the four different types of machines are summarized in Table 1 [15,16,17]. This paper is focused on four different types of six-phase outer-rotor PM machines, which are suitable for EV applications These four types of machines combine the advantages of PM machines and multiphase machines, achieving high power density, high torque density, better fault tolerance capability, and lower torque ripple.
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