Mahir Al-Ani

Continental AG

Automotive applications require electrical machines designed for high torque density, wide speed range and low cost. NdFeB magnets can achieve the high torque density and wide speed range, however, they have a high cost. Therefore, this paper explores the capability of rare-earth-free design through a PM-assisted synchronous reluctance motor (PM-Sy...

This paper presents a superconducting thermo-magnetic-mechanical (STMM) energy conversion process. This energy conversion concept revolves around of utilizing a cryogenic coolant, e.g., liquid nitrogen, as a thermal energy facilitator to cool down the superconductor to below the critical temperature. Then, utilizing the mixed state, i.e., Meissner...

A rotor retaining sleeve is mechanically necessary in the structure of high-speed SPM machines to prevent structural failure. However, the significant eddy current loss within metal sleeves leads to a reduction in electromagnetic efficiency and serious thermal and mechanical issues. Therefore, several techniques and methods have been proposed and d...

This paper presents a novel axial flux machine with multi‐flux‐path poles to utilize the flux generated by the end‐winding. The proposed topology consists of conventional axial flux machine albeit of a new set of either stator and/or rotor radial poles located at either the inner and/or outer radius of the machine. These new set of poles utilize th...

Dual rotor topology of synchronous reluctance machine is here proposed to improve the motor torque density and reduce the torque ripple. Thus, allowing synchronous reluctance machine to merge into EV and HEV applications. This paper presents a multi-physics design and analyses of three double rotor synchronous reluctance machine, 24/4, 36/4 and 48/...

This paper deals with a comparative study between reluctance (REL), permanent magnet assisted reluctance (PMAREL), and surface mounted permanent magnet synchronous machines with rotor eccentricity. Static, dynamic, and combined eccentricity cases are considered. For the sake of generality, this comparison is carried out at different levels of airga...

Global warming and climate change due to rising levels of greenhouse gases have placed significant pressure on the automobile industry to adopt more clean fuel, transportation electrification, and waste energy recovery technologies. As a result, several electrically assisted or driven turbo-machines have been proposed such as turbochargers, turbo-c...

Realisation of electrically boosted turbochargers requires electric motors capable of operating at very high speeds. These motors often use a permanent magnet rotor with the magnets retained within an interference fit external sleeve. Whilst it is possible to model such systems numerically, these models are an inefficient tool for design optimisati...

In this paper, a switched flux permanent magnet (SFPM) machine with radially segmented permanent magnets (PMs) is presented. The thickness of each segment is optimized to maximize the torque performance and reduce the total magnet material volume. The influence of the number of segments is studied by testing a different number of segments, i.e. 3,...

In this study, a mechanical flux adjusting technique for the switched flux permanent magnet (SFPM) machines is presented to improve the flux-weakening capability by extending the speed range. The ferromagnetic material pieces, that is, flux adjusters (FAs), are located on the outside surface of the stator poles equipped with permanent magnet (PM) a...

Several switched flux permanent magnet (SFPM) machines with mechanically movable flux adjusting technique are proposed, analyzed, and compared for applications which demand high speed and efficiency. By using ferromagnetic pieces-–one per every stator pole or every alternative stator pole, which are named as flux adjusters (FAs) and located on the...

Switched flux permanent magnet (SFPM) machines have significant potential for many industrial applications because of their doubly salient structure, similar to switched reluctance machines. In recent years, several novel SFPM machine topologies, such as multi-tooth, E-core and C-core, have been developed to reduce the usage of permanent magnet mat...

Purpose – The purpose of this paper is to investigate and compare the influence of end-effect on the torque-speed characteristics of three conventional switched flux permanent magnet (SFPM) machines having different stator/rotor pole combinations, i.e. 12/10, 12/13 and 12/14 as well as three novel topologies with less permanent magnets (PMs), i.e....

Purpose – The paper purposes a novel SFPM machine topology with radial and circumferential permanent magnets (PMs). The paper aims to discuss this issue. Design/methodology/approach – In order to reduce the flux leakage in the stator-outer region and consequently achieve higher magnetic material utilization in switched flux permanent magnet (SFPM)...

In this paper, the torque and flux weakening performances of alternative Switched Flux Permanent Magnet (SFPM) machines are experimentally investigated and compared. Firstly, the torque and flux weakening control performances of C-core SFPM machine with/without voltage error regulation are compared. It is shown that the flux weakening performance c...

To extend the speed range in the switched flux permanent magnet (SFPM) machines, mechanically movable flux adjusters (FAs), which consist of iron pieces located outside the stator, are utilized to adjust the airgap flux density. A comparative study of conventional SFPM machines with different stator/rotor pole combinations, i.e. 12/10, 12/13 and 12...

Novel topologies of switched flux permanent magnet (SFPM) machines with mechanically movable flux adjusters (FAs) for either all or alternative stator poles in order to extend the operation speed range are developed and analysed in this paper. Compared with the FAs which are located outside all of the stator poles of SFPM machines (all FAs), the al...

This paper presents a comparative study of electromagnetic performance in switched flux permanent magnet (SFPM) machines with different topologies, i.e. conventional SFPM machines, multi-tooth, E-core and C-core SFPM machines. With the aid of 2D finite element analysis (FEA), the torque waveform, cogging torque, back-emf and d- and q-axis inductanc...