Towards Fully Additively-Manufactured Permanent Magnet Synchronous Machines: Opportunities and Challenges

With the growing interest in electrification and as hybrid and pure electric powertrains are adopted in more applications, electrical machine design is facing challenges in terms of meeting very demanding performance metrics for example high specific power, harsh environments, etc. This provides clear motivation to explore the impact of advanced materials and manufacturing on the performance of electrical machines. This paper provides an overview of additive manufacturing (AM) approaches that can be used for constructing permanent magnet (PM) machines, with a specific focus on additively-manufactured iron core, winding, insulation, PM as well as cooling systems. Since there has only been a few attempts so far to explore AM in electrical machines (especially when it comes to fully additively-manufactured machines), the benefits and challenges of AM have not been comprehensively understood. In this regard, this paper offers a detailed comparison of multiple multi-material AM methods, showing not only the possibility of fully additively-manufactured PM machines but also the potential significant improvements in their mechanical, electromagnetic and thermal properties. The paper will provide a comprehensive discussion of opportunities and challenges of AM in the context of electrical machines

A parallel algorithm for Hamiltonian matrix construction in electron-molecule collision calculations: MPI-SCATCI

Construction and diagonalization of the Hamiltonian matrix is the rate-limiting step in most low-energy electron -- molecule collision calculations. Tennyson (J Phys B, 29 (1996) 1817) implemented a novel algorithm for Hamiltonian construction which took advantage of the structure of the wavefunction in such calculations. This algorithm is re-engineered to make use of modern computer architectures and the use of appropriate diagonalizers is considered. Test calculations demonstrate that significant speed-ups can be gained using multiple CPUs. This opens the way to calculations which consider higher collision energies, larger molecules and / or more target states. The methodology, which is implemented as part of the UK molecular R-matrix codes (UKRMol and UKRMol+) can also be used for studies of bound molecular Rydberg states, photoionisation and positron-molecule collisions.Comment: Write up of a computer program MPI-SCATCI Computer Physics Communications, in pres

High Specific Power Electrical Machines: A System Perspective

There has been a growing need for high specific power electrical machines for a wide range of applications. These include hybrid/electric traction applications, aerospace applications and Oil and Gas applications. A lot of work has been done to accomplish significantly higher specific power electrical machines especially for aerospace applications. Several machine topologies as well as thermal management schemes have been proposed. Even though there has been a few publications that provided an overview of high-speed and high specific power electrical machines [1-3], the goal of this paper is to provide a more comprehensive review of high specific power electrical machines with special focus on machines that have been built and tested and are considered the leading candidates defining the state-of-the art. Another key objective of this paper is to highlight the key “system-level” tradeoffs involved in pushing electrical machines to higher specific power. Focusing solely on the machine specific power can lead to a sub-optimal solution at the system-level

ExoCross: a general program for generating spectra from molecular line lists

ExoCross is a Fortran code for generating spectra (emission, absorption) and thermodynamic properties (partition function, specific heat etc.) from molecular line lists. Input is taken in several formats, including ExoMol and HITRAN formats. ExoCross is efficiently parallelized showing also a high degree of vectorization. It can work with several line profiles such as Doppler, Lorentzian and Voigt and support several broadening schemes. Voigt profiles are handled by several methods allowing fast and accurate simulations. Two of these methods are new. ExoCross is also capable of working with the recently proposed method of super-lines. It supports calculations of lifetimes, cooling functions, specific heats and other properties. ExoCross can be used to convert between different formats, such as HITRAN, ExoMol and Phoenix. It is capable of simulating non-LTE spectra using a simple two-temperature approach. Different electronic, vibronic or vibrational bands can be simulated separately using an efficient filtering scheme based on the quantum numbers

High-Torque-Density Low-Cost Magnetic Gear Utilizing Hybrid Magnets and Advanced Materials

Two major challenges of existing high-performance magnetic gears are: (i) High content of rare-earth permanent magnets which results in high cost as well as price fluctuation; (ii) Conflict between mechanical and electromagnetic performances, especially in the design of highspeed rotor. A magnetic gear using a blend of magnet types, i.e NdFeB, or Dy-free NdFeB and ferrites, is proposed in this paper. The goal is to bring down the cost while retaining comparable torque-transducing performance to a baseline magnetic gear only using rare-earth NdFeB magnets. A variety of topologies based on different combinations of magnet types and geometric shapes have been studied and compared. In addition, the potential impact of using an advanced dual-phase material is evaluated. The goal is to eliminate the well-known tradeoff between rotor mechanical integrity and PM flux leakage

How do the variations in military organization influence the implementation of economic coup proofing mechanisms in the MENA Region? The cases of Jordan, Syria and Egypt

The Arab uprisings have certainly caused quiet the watershed among scholars of civil-military relations. Incumbents that were rendered coup proofed were suddenly falling victim to the mercy of their militaries. Questions like, “Why is coup proofing more successful in some cases more than others?” and “Does coup proofing work?” guided the literature on coup proofing in the last decade even more so in the last four years. Significant research has been undertaken outlining possible reasons for the success/failure of coup proofing. Some authors have even questioned the viability of the coup-proofing process, but yet, no clear reasoning for variations in outcomes of coup-proofing appear to have emerged from the literature to date. Thus, this thesis attempts to take a step back and examine the process through which coup proofing mechanisms are formulated. More particularly, I pose the following questions: Why are there variations in the implementation of some coup proofing mechanisms and what are the conditions contributing to this variation in application? Escaping thus the trap of studying coup proofing as a monolithic process, this thesis studies the variation in the application of economic coup proofing – approach, technique and implementation – in relation to the organizational features of the military on which the tactics are implemented. To achieve this, the study conducts a qualitative comparison between Jordan, Syria and Egypt. All the regimes in question applied economic coup proofing as a means of buying military loyalty and they also bought them out of day-to-day politics. The Syrian Military, for example, relies on personalized and illicit activity – smuggling and currency dealing – as a means of generating military incentives. This is in comparison to the Egyptian and Jordanian Militaries who profit from controlling large industrial complexes. Questions explaining the reasons behind such variation remain unanswered. While it is theoretically valuable to study economic coup proofing as simply a means of buying off officers that ties the military to the incumbent, it is intuitively compelling to study it as a form of military business. This in-turn affects the military’s autonomy vis-à-vis the incumbent but also influences the military’s relation with society at larg

A Study About the Law of Jordanian Constitutional Court

The research is financed by Applied Science Private University/ Jordan Abstract The Political and constitutional jurisprudence agreed unanimously on recognizing the constitutions according to the principle of supremeness – i.e. subjective supremeness. This means that the topics discussed by such constitutions are supreme topics as they are the power and freedom laws. The principle of constitutions' supremeness also means the formal supremeness as the principle of constitution's supremeness forms the most important bases, elements and topics of the state of Law.So, it is necessary to maintain the supreme position of the constitution regarding the topics and the content or in the procedures and formalities necessary for enacting or amending the constitution. Therefore, there is an urgent need for the existence of a judicial agency or a political one undertaking to maintain the supreme position of the constitution.The Jordanian constitution has not controlled the constitutionality of the laws prior to the amendments done to some of its articles in 2011. so, the control done on the constitutionality of the laws was the abstention control. Pursuant to the said constitutional amendments, the constitutional court was established with enacting its law. It has become the sole agency entrusted to control the constitutionality of the laws whereas the researcher discussed the way of forming such court and the methods of how to defend the unconstitutionality before it. the researcher also discussed the manner of forming such court and how the unconstitutionality lawsuits can be pursued before it. Keywords: Constitutionality of laws, Constitutional Court, Judicial Control, abstention control, political control, defending with unconstitutionality, interpreting the texts of the constitution