Axial flux switched reluctance machines: a comprehensive review of design and topologies

Abstract

Axial flux switched reluctance machines (AFSRMs) exhibit unique characteristics that specify their superiority over other topologies in specific applications. A number of researchers have studied the efficient design and constructed structures in different types of AFSRMs. Each of such studies seeks to produce a motor with improved characteristics. Here, a comprehensive study is performed in AFSRMs, including their design considerations, sizing equations and the structural changes. The sensitivity of parameters for efficient operation is investigated. Also, the comparisons among topologies are provided for each of the identified metrics. This study ends with a comparison summary, which shows the performance indices evaluation of different topologies to utilise in various applications.

Design, modelling and optimisation of a slot‐less axial flux permanent magnet generator for direct‐drive wind turbine application

“…In this regard, axial flux permanent magnet machines (AFPMs) are potential alternatives to the radial flux machines for the above‐mentioned application. Compared to the radial flux permanent magnet machines (RFPMs), AFPMs are among compact topologies which higher torque densities can be achieved [9, 10]. The copper and core weight in AFPM topologies could be reduced significantly, resulting in higher values of efficiency compared to the RFPMs [11].…”

Non‐linear analytical modelling and optimisation of a 12/8 rotor excited flux‐switching machine

“…However, the segmented rotor is believed to reduce the manufacturing efforts of large electrical machines which lead to a simpler procedure [14]. Also, in the segmented rotor topology, the magnetic flux path is shorter resulting higher flux linkage and lower PM volume [14–17]. The segmented rotor topology is also considered in linear topologies when a low‐cost secondary is required such as in maglev application [18, 19].…”

Design of a Novel Modular Axial-Flux Double Rotor Switched Reluctance Drive

“…Ebrahimi and Feyzi made some contributions to the design of AFSRM with modular stator [9]. Recently, Lin proposed a variation of the output equation for this type of machine [10] and Torkaman et al [11] provided a review of the design of AFSRM including a comparison, considering the assessment of some performance indices among different topologies. This paper proposes a new procedure, taking into account saturation, for the sizing of a particular type of an AFSRM with an inner stator and two exterior rotors that have a new distribution of the stator and rotor poles resulting in short magnetic paths with no flux reversal that have been presented in [12][13][14][15][16].…”