magnet machines using loss model with variable coefficients ISSN 1751-8660 Received on 16th January 2020 Revised 6th April 2020 Accepted on 18th May 2020 ... predict iron loss of machines at an arbitrary frequency, the comparison shows that the accuracy of the three-term model is higher. In addition, experiments validate that proposed three ...
Ferromagnetism: On a macroscopic scale, the substance can become magnetized; iron is ferromagnetic; how machines detect value of currency. Materials. US $1 bills (two minimum) US currency of various denominations (optional) Strong magnet (neodymium magnet works well; Educational Innovations M-100; $9.95) Blender (dedicated for non-food related use)
This paper presents a permanent-magnet servomotor, built with a powdered iron stator, which has been designed to take full advantage of the properties of the material. There are a number of important design features which are not possible with laminated cores. For example, the core back is axially extended over the end windings, the armature core components are subdivided …
Interior PM (IPM) machines can have severe local magnetic saturation especially in the rotor iron region above the PMs and the stator tooth-tips. In this paper, the influence of local magnetic saturation on the iron losses is comprehensively investigated in IPM machines accounting for the influence of the slot/pole number combinations. Due to local magnetic saturation, the tooth …
Abstract: This paper presents a research work on the electromagnetic loss modeling and demagnetization analysis for a high-speed permanent magnet machine (HSPMM). The iron loss is estimated by improved modeling considering harmonics and rotational magnetic field effects to achieve high precision; rotor eddy current loss is researched and …
We present a faster and simpler approach for the calculation of iron and magnet losses and torque of an interior permanent-magnet synchronous machine (IPMSM) than finite-element methods (FEM). It uses a magnetic equivalent circuit (MEC) based on large elements and takes into account magnetic saturation and magnet eddy currents. The machine is …
This paper gives a broad overview of methods to model core losses from the magnetization of soft magnetic iron cores in electrical machines. The review study starts with some commonly used models of loss separation for hysteresis losses and eddy current losses. The study links the models to physical models of magnetization, considering domain ...
Most industrial applications concern output torque, rotor mass, and utilization of rare Earth permanent-magnet (PM) material of electrical machines. Generally, it is challenging to improve these aspects simultaneously. The objective of this article is to propose a novel concentrated-flux-type PM machine with irregular magnets and iron poles (CPMIP). The …
A permanent magnet servo motor, built with a powdered iron stator, which has been designed to take full advantage of the properties of the material, offering far superior performance to a conventionally laminated commercial machine, manufactured in the same frame. This paper presents a permanent magnet servo motor, built with a powdered iron …
An analytical method is proposed to model the magnetic field distribution across a slotless tubular interior permanent magnet machine. In order to consider the permeability of both permanent magnets and iron poles of the slider, in the proposed approach, instead of choosing each one as an individual sub-domain, they are taken as an integrated sub-domain.
Hybrid-excited machines utilize the synergies of permanent magnet (PM) and wound field machines. Flux-switching PM machines have emerged as an attractive machine type due to the fact that the excitation sources are located in the stator allowing a simple robust rotor whilst providing high torque density. This paper proposes topologies of hybrid-excited flux …
Iron crystal has a magnetic spin of 2.2 Bohr Magnetons aligning in the same direction to give a magnetic field of 2.2T [4]. Saturation magnetization is heavily temperature dependent. If the temperature is increased, thermal agitation disrupts the alignment of the spins. Each magnetic domain is individually magnetized to saturation.
Thanks to their many merits such as high power density and fast dynamic response, the high-speed permanent magnet machines (HSPMMs) have attracted increasing industrial and domestic applications. However, the iron loss may become significantly higher at higher operating speed and frequency and it should be carefully considered in the machine …
A key challenge for the design of dual three-phase electric machine is how to increase its electromagnetic torque and reduce short-circuit current simultaneously. In this article, a novel mixed iron-pole Halbach (MIH) magnet pattern is proposed for the electric machine. It can offer a variety of advantages. First, it improves the air gap flux density, which helps to …
A magnetic separator consists of a powerfulmagnet that is placed or suspended from a ceiling or device. Materials can bepassed over a table top magnetic separator, while suspended magnetic separatorsoften hang over a material to remove its impurities. Magnetic separators canalso be cylinders through which o…
Abstract: This article presents an improved estimation model to predict the additional iron loss due to pulsewidth modulation (PWM) switching in interior permanent magnet (IPM) machines. The input current including the predicted PWM-induced current ripple is fed to two-dimensional (2-D) finite-element analysis to calculate the PWM-induced flux ripple …
As iron core of the armature is rotating in magnetic field, some losses occurs in the core which is called core losses.Normally, machines are operated with constant speed, so these losses are almost constant. These losses are categorized in two form; Hysteresis loss and Eddy current loss. Hysteresis Loss in DC Machine
In order to demagnetise permanent magnets, a magnetic field with very high field strength is required, as magnets are made of magnetic materials that have a much higher coercive force (wikipedia/coercive field strength) than iron or steel. After they are manufactured and processed, magnets are magnetised using a very strong magnetic field to up ...