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The data provided here is for the electromagnetic heating of magnetite under radio-frequencies. The data includes that from material characterisation, in-situ magnetometry, calorimetry, in-situ power absorption measurement and arc-tangent modelling results. The data is aligned to the figures in the research publication and is intended that future researchers can make their own analysis based upon our work. Further relevant documentation may be found in the following resources. Noble, J. P. P., Bending, S. J., Sartbaeva, A., Muxworthy, A. R., and Hill, A. K., 2021. A Novel In Situ High‐Temperature Magnetometry Method for Radiofrequency Heating Applications. Advanced Energy Materials, 12(1), 2102515. Available from: https://doi.org/10.1002/aenm.202102515. The data is collected using techniques described fully in the accompanying research article. The data follows the figure numbers from the paper which should make it easy to navigate.

When approaching the design of a multipole magnet, such as a dipole, quadrupole, sextupole, and so on, it is highly advantageous to initiate the process by establishing the fundamental parameters. These parameters include conductor size, current density, inner and outer radius of the iron yoke, and more. This preliminary dimensioning enables the acquisition of the necessary specifications for the design. Within this report, analytical expressions for the magnetic field, Lorentz forces, and stored energy of multipole magnets with the cos(nθ) and sector coil configurations, both with and without the presence of an iron yoke, are derived. These derivations are based on the vector potential of a current line.

With renewable energy an increasingly essential element in providing clean, abundant energy and combating climate change, wave energy presents an enormous untapped resource. Key to the challenges facing the industry are the high operation and maintenance costs associated with operating in offshore environments. A recent technological development that could address this issue is the magnetic gear. The magnetic gear allows for smaller and more efficient electrical machines while providing inherent protection to the drivetrain and requiring substantially reduced maintenance due to the contactless nature of operation. With magnetic gears now reaching a high technology readiness level there is a need to develop accurate and efficient design methods. This work looks at developing these methods, along with design tools, with a focus on application to wave energy devices. This work introduces the concept and operating principles of magnetic gears and gives a state of the art in the variations available. Following a discussion of design considerations and methodology, the tools developed in this work are applied in the design and development of two prototypes which are tested for a range of operating conditions followed by a critical analysis of the results.

As the automotive paradigm shifts towards electric, limited range remains a key challenge. Increasing the battery size adds weight, which yields diminishing returns in range per kilowatt-hour. Therefore, energy recovery systems, such as regenerative braking and photovoltaic cells, are desirable to recharge the onboard batteries in between hub charge cycles. While some reports of regenerative suspension do exist, they all harvest energy in a parasitic manner, and the predicted power output is extremely low, since the majority of the energy is still dissipated to the environment by the suspension. This paper proposes a fundamental suspension redesign using a magnetically-levitated spring mechanism and aims to increase the recoverable energy significantly by directly coupling an electromagnetic transducer as the main damper. Furthermore, the highly nonlinear magnetic restoring force can also potentially enhance rider comfort. Analytical and numerical models have been constructed. Road roughness data from an Australian road were used to numerically simulate a representative environment response. Simulation suggests that 10’s of kW to >100 kW can theoretically be generated by a medium-sized car travelling on a typical paved road (about 2–3 orders of magnitude higher than literature reports on parasitic regenerative suspension schemes), while still maintaining well below the discomfort threshold for passengers (<0.315 m/s 2 on average).

A novel and sustainability-oriented approach to the design of large-aperture iron-dominated magnets is proposed, focusing on its application to charged particle momentum detection in high-energy experimental physics. As compared to classical design techniques, a broader number of goals and constraints is taken into account, considering jointly the detection performance, the minimization of both the electrical power and magnet size, and the electromagnetic efficiency. A case study is considered for the detector magnet of a specific experiment, where the optimal design is pursued with semi-analytical tools, duly introducing the main quantities’ scaling laws in analytical form and successively validating the results with 3D numerical tools. A solution at higher energy efficiency is obtained, as compared to a more traditional design point of view. The proposed methodology can be fruitfully employed also in the design of magnets with a reduced ecological footprint in a number of other industrial and medical applications.

Experimental results and theoretical studies call for Reversed Field Experiment (RFX) machine and power supply improvements to allow studies that go beyond those of a conventional Reversed Field Pinch (RFP) with passively stabilized turbulent MHD dynamo. The RFX experiment, in operation at Padua (Italy) since 1992, is the most important RFP machine in the world. The RFP magnetic configuration is actively studied in Europe, USA and Japan for its perspectives in reach the fusion conditions at low magnetic field and for the particular scientific interest of plasmas in this configuration. The new paths on the MHD mode studies and control, opened by recent results in RFX and other RFP machines, are introduced. Then the goals and the design lines of the technical modifications of RFX, mainly addressed to actively interact with the MHD modes through the control of the plasma magnetic boundary are reported. The main modifications introduced are related with the improvement the first wall, the addition of 192 saddle coils around the shell and to increase the operational flexibility of the toroidal field circuit power supply.

This paper proposes an observer-based volts-per-hertz (V/Hz) control method for synchronous motors. The method is applicable to any synchronous motor type, from permanent-magnet (PM) motors to synchronous reluctance motors (SyRMs). The method consists of a state-feedback control law and a state observer, both of which are designed to be inherently sensorless. The gains can be selected using simple closed-form expressions, resulting in a locally stable and passive system in the whole feasible operating range. Unstable regions and heuristic tuning of conventional V/Hz control are thus avoided. Compared to sensorless field-oriented control, neither speed controller nor separate field-weakening method is needed, the full inverter voltage can be utilized, and the sensitivity to parameter errors is reduced. For the majority of industrial drive applications, the dynamic performance of the proposed method is adequate. Peer reviewed

Frustration of magnetic systems which is caused by competing interactions is the driving force of several unusual phenomena such as plateaus and jumps of the magnetization curve as well as of unusual energy spectra with for instance many singlet levels below the first triplet state. The antiferromagnetic cuboctahedron can serve as a paradigmatic example of certain frustrated anti ferromagnets. In addition it has the advantage that its complete energy spectrum can be obtained up to individual spin quantum numbers of s=3/2 (16777216 states). (C) 2008 Elsevier Ltd. All rights reserved.

Reconnection events in high current reversed field pinch plasmas are often associated to the partial or total transitions from a helical topology with conserved flux surfaces to a configuration characterized by a chaotic magnetic field. The electron temperature dynamic together with the magnetic energy reconstructions are used to evaluate the energy balance during these events and to quantify the associated dissipated power and released energy. A fraction of the energy released during reconnection events is involved in ion heating, as estimated by the energy distribution function of neutral atoms, a rather interesting feature in a reactorial perspective.