Physical Properties of Ternary Re-Fe Base Alloys and their Relationship to Permanent Magnet Applications

MRS Proceedings ◽

10.1557/proc-96-1 ◽

1987 ◽

Vol 96 ◽

Cited By ~ 4

Author(s):

K. H. J. Buschow

Keyword(s):

Physical Properties ◽

Permanent Magnet ◽

Permanent Magnets ◽

Amorphous State ◽

Tetragonal Structure ◽

Ternary Compounds ◽

Alternative Materials

ABSTRACTSeveral ternary compounds of tetragonal structure and with the composition R2Fe14B have found an application as starting materials for permanent magnets. Several physical properties of R2Fe14B compounds will be discussed in relation to the modification in properties that can be obtained by substituting other elements for R, Fe or B. Also investigated is the extent to which it will be possible to find alternative materials differing in structure and composition from R2Fe14B. For this purpose the results obtained on 3d-rich ternaries based on well-known structure types will be reviewed. Included in this survey will be novel ternary intermetallics made by crystallization from the amorphous state. These compounds, though stable enough for applications, are actually metastable. They are not found in the corresponding equilibrium diagrams.

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Study and design of dual stator permanent magnet machine with spoke-type configurations using phase-group concentrated-coil windings

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209457 ◽

2020 ◽

Vol 64 (1-4) ◽

pp. 1381-1389

Author(s):

Dezhi Chen ◽

Chengwu Diao ◽

Zhiyu Feng ◽

Shichong Zhang ◽

Wenliang Zhao

Keyword(s):

Permanent Magnet ◽

Permanent Magnets ◽

Low Cost ◽

Dynamic Performance ◽

Torque Ripple ◽

Permanent Magnet Machine ◽

Torque Density ◽

Phase Group ◽

High Torque ◽

Simulation Results

In this paper, a novel dual-stator permanent magnet machine (DsPmSynM) with low cost and high torque density is designed. The winding part of the DsPmSynM adopts phase-group concentrated-coil windings, and the permanent magnets are arranged by spoke-type. Firstly, the winding structure reduces the amount of copper at the end of the winding. Secondly, the electromagnetic torque ripple of DsPmSynM is suppressed by reducing the cogging torque. Furthermore, the dynamic performance of DsPmSynM is studied. Finally, the experimental results are compared with the simulation results.

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PROJECT 70/PROJECT 7000 STAINLESS TYPE 203

Alloy Digest ◽

10.31399/asm.ad.ss0505 ◽

1997 ◽

Vol 46 (8) ◽

Keyword(s):

Stainless Steel ◽

Corrosion Resistance ◽

Physical Properties ◽

Tensile Properties ◽

Magnetic Permeability ◽

Stainless Steels ◽

Heat Treating ◽

High Manganese ◽

Aisi Type ◽

Alternative Materials

Abstract Project 70 and Project 7000 Type 203 stainless steels are alternative materials to AISI Type 303, resulfurized stainless steel having improved machinability. High manganese and copper are substituted for some nickel resulting in a stable austenitic structure having low magnetic permeability. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, and joining. Filing Code: SS-505. Producer or source: Carpenter. Originally published May 1989, revised August 1997.

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Research on the Non-Magnetic Conductor of a PMSM Based on the Principle of Variable Exciting Magnetic Reluctance

Energies ◽

10.3390/en14020318 ◽

2021 ◽

Vol 14 (2) ◽

pp. 318

Author(s):

Chunyan Li ◽

Fei Guo ◽

Baoquan Kou ◽

Tao Meng

Keyword(s):

Permanent Magnet ◽

Electromagnetic Force ◽

Electromotive Force ◽

Permanent Magnets ◽

Permanent Magnet Synchronous Motor ◽

Synchronous Motor ◽

Magnetic Conductor ◽

Critical Speeds ◽

Motor Structure ◽

Test Result

A permanent magnet synchronous motor (PMSM) based on the principle of variable exciting magnetic reluctance (VMRPMSM) is presented. The motor is equipped with symmetrical non-magnetic conductors on both sides of the tangential magnetized permanent magnets (PMs). By placing the non-magnetic conductor (NMC), the magnetic reluctance in the exciting circuit is adjusted, and the flux weakening (FW) of the motor is realized. Hence, the NMC is studied comprehensively. On the basis of introducing the motor structure, the FW principle of this PMSM is described. The shape of the NMC is determined by analyzing and calculating the electromagnetic force (EF) acting on the PMs. We calculate the magnetic reluctance of the NMC and research on the effects of the NMC on electromagnetic force, d-axis and q-axis inductance and FW performance. The critical speeds from the test of the no-load back electromotive force (EMF) verify the correctness of the NMC design. The analysis is corresponding to the test result which lays the foundation of design for this kind of new PMSM.

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Design of a New 1D Halbach Magnet Array with Good Sinusoidal Magnetic Field by Analyzing the Curved Surface

Sensors ◽

10.3390/s21072522 ◽

2021 ◽

Vol 21 (7) ◽

pp. 2522

Author(s):

Guangdou Liu ◽

Shiqin Hou ◽

Xingping Xu ◽

Wensheng Xiao

Keyword(s):

Magnetic Field ◽

Magnetic Flux ◽

Permanent Magnet ◽

Flux Density ◽

Permanent Magnets ◽

Air Gap ◽

Curved Surface ◽

Magnetic Flux Density ◽

Sinusoidal Magnetic Field ◽

The Magnetic Field

In the linear and planar motors, the 1D Halbach magnet array is extensively used. The sinusoidal property of the magnetic field deteriorates by analyzing the magnetic field at a small air gap. Therefore, a new 1D Halbach magnet array is proposed, in which the permanent magnet with a curved surface is applied. Based on the superposition of principle and Fourier series, the magnetic flux density distribution is derived. The optimized curved surface is obtained and fitted by a polynomial. The sinusoidal magnetic field is verified by comparing it with the magnetic flux density of the finite element model. Through the analysis of different dimensions of the permanent magnet array, the optimization result has good applicability. The force ripple can be significantly reduced by the new magnet array. The effect on the mass and air gap is investigated compared with a conventional magnet array with rectangular permanent magnets. In conclusion, the new magnet array design has the scalability to be extended to various sizes of motor and is especially suitable for small air gap applications.

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Effect of Al2O3 addition with concentration (x=0.1%, 0.2%, 0.4%) mol on the crystal structure and physical properties of permanent magnets barium hexaferrite (BaO6Fe2O3)

Journal of Physics Conference Series ◽

10.1088/1742-6596/1282/1/012026 ◽

2019 ◽

Vol 1282 ◽

pp. 012026

Author(s):

Ramlan ◽

Febriyani Amizwan ◽

Mulyadi ◽

Suprapedi ◽

Dedi Setiabudidaya

Keyword(s):

Crystal Structure ◽

Physical Properties ◽

Permanent Magnets ◽

Barium Hexaferrite ◽

Al2o3 Addition

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Analysis of a Tubular Linear Permanent Magnet Motor for Reciprocating Compressor Applications

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.448-453.2114 ◽

2013 ◽

Vol 448-453 ◽

pp. 2114-2119 ◽

Cited By ~ 3

Author(s):

Izzeldin Idris Abdalla ◽

Taib Ibrahim ◽

Nursyarizal Mohd Nor

Keyword(s):

Permanent Magnet ◽

Permanent Magnets ◽

Outer Radius ◽

Design Parameters ◽

Reciprocating Compressor ◽

Permanent Magnet Motors ◽

Permanent Magnet Motor ◽

Element Analysis ◽

Split Ratio ◽

Single Coil

This paper describes a design optimization to achieve optimal performance of a two novel single-phase short-stroke tubular linear permanent magnet motors (TLPMMs) with rectangular and trapezoidal permanent magnets (PMs) structures. The motors equipped with a quasi-Halbach magnetized moving-magnet armature and slotted stator with a single-slot carrying a single coil. The motors have been developed for reciprocating compressor applications such as household refrigerators. It is observed that the TLPMM efficiency can be optimized with respect to the leading design parameters (dimensional ratios). Furthermore, the influence of mover back iron is investigated and the loss of the motor is computed. Finite element analysis (FEA) is employed for the optimization, and the optimal values of the ratio of the axial length of the radially magnetized magnets to the pole pitch as well as the ratio of the PMs outer radius-to-stator outer radius (split ratio), are identified.

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Crystal chemistry and physical properties of the ternary compounds REBC (RE=Ce, Pr, Nd)

Solid State Sciences ◽

10.1016/j.solidstatesciences.2008.06.012 ◽

2009 ◽

Vol 11 (2) ◽

pp. 501-506 ◽

Cited By ~ 6

Author(s):

Volodymyr Babizhetskyy ◽

Kurt Hiebl ◽

Hansjürgen Mattausch ◽

Arndt Simon

Keyword(s):

Physical Properties ◽

Crystal Chemistry ◽

Ternary Compounds

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Design and Analysis of a Novel Axial-Radial Flux Permanent Magnet Machine with Halbach-Array Permanent Magnets

Energies ◽

10.3390/en14123639 ◽

2021 ◽

Vol 14 (12) ◽

pp. 3639

Author(s):

Rundong Huang ◽

Chunhua Liu ◽

Zaixin Song ◽

Hang Zhao

Keyword(s):

Permanent Magnet ◽

Permanent Magnets ◽

Torque Ripple ◽

Axial Flux ◽

Element Analysis ◽

Torque Density ◽

Axial Forces ◽

Halbach Array ◽

Radial Flux ◽

High Torque

Electric machines with high torque density are needed in many applications, such as electric vehicles, electric robotics, electric ships, electric aircraft, etc. and they can avoid planetary gears thus reducing manufacturing costs. This paper presents a novel axial-radial flux permanent magnet (ARFPM) machine with high torque density. The proposed ARFPM machine integrates both axial-flux and radial-flux machine topologies in a compact space, which effectively improves the copper utilization of the machine. First, the radial rotor can balance the large axial forces on axial rotors and prevent them from deforming due to the forces. On the other hand, the machine adopts Halbach-array permanent magnets (PMs) on the rotors to suppress air-gap flux density harmonics. Also, the Halbach-array PMs can reduce the total attracted force on axial rotors. The operational principle of the ARFPM machine was investigated and analyzed. Then, 3D finite-element analysis (FEA) was conducted to show the merits of the ARFPM machine. Demonstration results with different parameters are compared to obtain an optimal structure. These indicated that the proposed ARFPM machine with Halbach-array PMs can achieve a more sinusoidal back electromotive force (EMF). In addition, a comparative analysis was conducted for the proposed ARFPM machine. The machine was compared with a conventional axial-flux permanent magnet (AFPM) machine and a radial-flux permanent magnet (RFPM) machine based on the same dimensions. This showed that the proposed ARFPM machine had the highest torque density and relatively small torque ripple.

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