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This paper performs a quantitative comparison between a DSPM motor, and the Prius-IPM motor that is used in the Prius hybrid electric vehicle (HEV). For fair comparison, the two motors are designed with the same phase current, current density, and overall dimensions. We have firstly simulated the Prius-IPM motor and compared the results with the data obtained from previous research. The results agree...
Electric Machine is an energy conversion device, which realizes the electrical energy and mechanical energy convert to each other through electromagnetic power or electromagnetic torque. Electromagnetic torque is an important medium for this conversion progress. Thus accurate estimation or model of electromagnetic torque is desired for designing and analyzing the electric machines. Furthermore electromagnetic...
The group-IV-based spintronics is extremely appealing, due to high compatibility with mainstream Si-based technology [1]. Since the discovery of giant magnetoresistance (MR) from Fe/Cr multilayers [2], extensive studies of Fe-based heterogeneous structures have been performed for spintronic applications. To sum up, taking into account the potential application of group-IV-based spintronics and the...
The magnetostrictive Fe-Ga alloy is a unique smart materials with large magnetostriction and strong mechanical strength. Significant researches have been drawn to understand the origin of magnetostriction and improve the magnetostrictive performance. Due to the high conductivity, Fe-Ga alloy needs to be formed into the sheets to avoid current losses, and the high magnetostrion λ// along the applied...
Permanent magnet synchronous motor (PMSM) has been widely used in household appliances, medical instruments and vehicles. Electromagnetic interference (EMI) is a challenging problem for PMSM drive system fed by pulse width modulation (PWM) inverter because of the reason that EMI noise generates undesirable influences on control system such as communication errors, degraded equipment performance and...
PMSMs with concentrated windings gain more and more interests due to the very short end winding and advantages in the production process, for which they are desirable for wind power generations, electric vehicles and torque propulsion and so on [1]. However, concentrated windings produce a rich spectrum of flux density harmonics, which rotate asynchronously with respect to the rotor, inducing eddy...
Large-scale superconducting direct-drive (SCDD) generators have received lots of attention in recent years, featuring high torque density, efficiency and reliability [1]. Due to the application of SC field windings, airgap flux density is large and often more than 2 Tesla (no more than 1 T in traditional machines), which could result in huge electromagnetic radial forces and vibrations in SCDD generators...
Microwave assisted magnetic recording (MAMR) is a promising candidate to achieve the areal density above 1Tb/in2 [1]. Nowadays CoX/Pt multilayer is chosen as the media for STO MAMR due to its ultrahigh interfacial anisotropy [2]. In this paper, a micromagnetic model is utilized for recording simulation on high anisotropy (Hk >25 kOe) CoX/Pt media, with Voronoi polycrystalline built up based on...
Axial flux PM machines (AFPM) are widely used in elevators, in-wheel drive and wind turbine applications for its advantages such as high torque density, short axial length and compact construction [1, 2], etc. Different with radial flux machines, the performance of AFPMs are easily affected by rotor eccentricity, since the appealing force in axial direction between stator and rotor disk is huge in...
In permanent magnet synchronous machines (PMSMs), the flux is produced by two components-armature current and PMs. The flux produced by armature current can be removed when the current is set to zero, while the flux produced by PMs always exists in conventional PMSMs. In design process, it is necessary to separate them according to excitation in order to accurately calculate the d- and q-axis inductance...
Microwave soft magnetic films (SMFs) are key materials, which can effectively miniaturize and multifunctionalize the electromagnetic components and devices, such as filters, phase shifters, thin film wireless inductors, magnetic recording write heads, antennas, etc.1, and reduce their occupation area in microwave monolithic integrated circuit (MMIC) boards. Modern electronic products are heading towards...
Spinel ferrites have been extensively used in the design and implementation of electromagnetic interference (EMI) suppressors and EM wave absorption materials in the megahertz frequency range. It is well known that EMI absorbing magnetic materials require high initial permeability and loss factor. MnZn and NiZn spinel ferrites are often used in the lower frequency range (< 300 MHz) due to the limit...
For the complex structure of the large capacity turbo-generator in end region, the accurate calculation of the leakage magnetic field became key factor in large generator design. Affected by the leakage magnetic field, there is a problem that the end stator ladder packets, copper screen, press plate has a local high temperature. The three-dimensional electromagnetic field of a 330 MW water-hydrogen-hydrogen...
Heat assisted magnetic recording is the most promising technology for high density recording. Due to thermal diffusion of the media, its density potential is limited for continuous wave laser heating. Short pulse laser heating can greatly increase the density potential [1-3]. This heating strategy also leads to a low transducer temperature increase [4]. Therefore, short pulse laser heating is a must...
The torque ripple of arc permanent magnet synchronous motors (PMSMs) is significant for the positioning precision and tracking accuracy of the large telescope. In this digest, an arc vernier PMSM is proposed, which fully utilizes the advantage of vernier machine with low torque ripple and high torque density. The stator length and the relative positions of different stators are optimized to reduce...
Permanent magnet synchronous machines (PMSM) have high torque density, efficiency, power factor and so on compared with other type of machines. PMSMs can be separated into traditional well-known distributed wounded (DW) machines and fractional slot concentrated winding (FSCW) machines [1]. FSCW machines own low cogging torque, compact structure, high power density, and convenient fabrication, etc...
Inrush currents are high magnitude currents generated typically during energization of a transformer, being a large transient caused by saturation of the magnetic core of the transformer. The magnitudes of the inrush currents can be initially several times the rated load current which will cause error actions of the relay protection equipment [1]. When a transformer is put into operation at the optimal...
Due to significant application in medical treatment, magnetic record and cryogenic magneto-refrigeration, a great amount of researches on ferromagnetic nanoparticles were executed [1]. With decrease of the scale of ferromagnetic material, the magnetic order and magnetization gradually decrease and such decrease is attributed to the increasing surface disorder or surface spin canting. However, for...
With advantages of low emissions, fuel flexibility, high efficiency and energy saving, micro turbines (MTs) are one of the most important technologies for distributed generated systems (DGSs) [1,2]. With many advantages such as high power density, simple structure, and higher efficiency, high speed permanent magnetic generator systems (HSPGSs) attract more attentions from the world wide researchers...
Compared with the slotted tubular generators, air-cored tubular generator has no attraction force, smaller thrust ripple and lower moving mass. The advantages of high respond speed and high output stability make the air-cored tubular generators to be research focus in recent years. It is used in energy conversion systems of ambient vibrations, free-piston engine, ocean wave energy and so on. And in...
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