scholarly journals Static Characterization of the Driving, Normal and Stall Forces of a Double-Sided Moving-Permanent Magnet-Type Planar Actuator Based on Orthogonal Planar Windings

Sensors ◽  
2018 ◽  
Vol 18 (10) ◽  
pp. 3526
Author(s):  
Marilia A. da Silveira ◽  
Marcos J. Susin ◽  
Aly F. Flores Filho ◽  
David G. Dorrell
Keyword(s):  
Permanent Magnet ◽  
External Force ◽  
Analytical Methods ◽  
Permanent Magnets ◽  
Magnetic Coupling ◽  
Experimental Results ◽  
Average Sensitivity ◽  
Stall Force ◽  
Numerical And Analytical Methods

This work presents a study of the traction, normal and stall forces in a two-sided planar actuator with orthogonal planar windings and a mover that comprises two cars magnetically coupled to each other through two pairs of permanent magnets (PMs). There is no ferromagnetic armature core because of the permanent magnets array in the mover and orthogonal traction forces can be generated in order to move both cars jointly in any direction on a plane. The stall force is the minimal force necessary to break up the magnetic coupling between the two cars. When one of the cars is subjected to an external force through the x- or y-axis, the cars can become out of alignment with respect to each other and the planar actuator cannot work properly. The behavior of the forces was modelled by numerical and analytical methods and experimental results were obtained from tests carried out on a prototype. The average sensitivity of the measured static propulsion planar force along either axis is 4.48 N/A. With a 20-mm displacement between the cars along the direction of the x-axis and no armature current, a magnetic stall force of 17.26 N is produced through the same axis in order to restore the alignment of the two cars

Study of the Spinning Mechanism Resulting from Permanent Magnet Linear Actuation

2012 ◽  
Vol 721 ◽  
pp. 255-260
Author(s):  
Koichi Oka ◽  
Feng Sun ◽  
Akira Tsurumi ◽  
Gota Nakamura
Keyword(s):  
Permanent Magnet ◽  
Remanent Magnetization ◽  
Permanent Magnets ◽  
Experimental Results ◽  
Strain Gauges ◽  
Measurement Device ◽  
Linear Movement ◽  
Integral Element ◽  
Method Analysis ◽  
Element Method

This paper describes an analysis of torque characteristics of a noncontact spinning system using linearly actuated magnets. This noncontact spinning system spins the suspended object (here is an iron ball) without contact by the remanent magnetization and the linear movement of four permanent magnets. In this paper, the remanent magnetization point is modeled, and the rotational torque of this mechanism is calculated by IEM (Integral Element Method) analysis. The rotational torque is also measured using a measurement device with strain gauges. According to the IEM analysis results and the experimental results, the rotational torque characteristics of the noncontact spinning system are discussed.

Magnetic Hardening Mechanism in Sintered R-Fe-B Permanent Magnets

1987 ◽  
Vol 96 ◽  
Author(s):  
M. Sagawa ◽  
S. Hirosawa
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
State Of The Art ◽  
Spontaneous Magnetization ◽  
Experimental Results ◽  
Surface Conditions ◽  
Hardening Mechanism ◽  
Sintered Magnets ◽  
Field Coefficient ◽  
Magnetic Hardening

ABSTRACTThe state-of-the-art description of the magnetic hardening mechanism in the sintered Nd-Fe-B permanent magnet is given. Recent experimental results concerning the coercivity-anisotropy (Hc -HA) correlation in B-rich Pr-Fe-B and Nd-Fe-B sintered magnets and the inhluence of the surface conditions of the sintered Nd-Fe-B magnets on the coercivity are reported. These results are interpreted in terms of the μ0Hc versus cμ0 HA -NIS plot, where I is the spontaneous magnetization of R2 Fe14 (R=Pr or Nd) and N the effective demagnetization field coefficient.

A Low Frequency Permanent Magnet Passive Vibration Isolator

2012 ◽  
Vol 586 ◽  
pp. 328-336
Author(s):  
Qiang Li ◽  
Deng Feng Xu ◽  
Jin Chun Hu ◽  
Liu Hao
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Load Capacity ◽  
Semiconductor Industry ◽  
Low Frequency ◽  
Magnetic Suspension ◽  
Experimental Results ◽  
Vibration Isolator ◽  
Rubber Membrane ◽  
Guide Device

Magnetic suspension vibration isolators have attracted significant attention in the field of semiconductor industry and high precision equipments. However, it is impossible to levitate an object by only permanent magnet due to instability of permanent magnets. It needs a guide device or active control to hold the magnetic suspension passive vibration isolator (MSPVI) at equilibrium position. In order to overcome the instability of the permanent magnets, the linear bearing, rubber O-ring and rubber membrane are applied in the MSPVI. The transmissibility of the MSPVI was calculated and subsequently measured. The experimental results show that the MSPVI can achieve low natural frequency with the help of the rubber membrane which is superior to the linear bearing and o-ring. Beside, the vibration isolating performance of the MSPVI is measured. The experimental results reveal that the MSPVI achieves the lowest resonant frequency when the load capacity of the MSPVI reaches maximum value.

TRANSMISSION TORQUE OF A STANDART MAGNETIC COUPLING DEPENDING ON THE PERMANENT MAGNET BRAND AND ITS SHAPE WITH GAP BETWEEN THE MAGNETS OF 5 MM

2021 ◽  
pp. 3-8
Author(s):  
A. Ya. Krasil’nikov ◽  
A. A. Krasil’nikov
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Barium Hexaferrite ◽  
Magnetic Coupling ◽  
Air Gap ◽  
Neodymium Iron Boron

The article considers the possibility of changing the transmitting torque of a cylindrical magnetic coupling depending on the brand of a highly coercive permanent magnet: neodymium–iron–boron, samarium–cobalt and barium hexaferrite types Using the example of a standard magnetic coupling with a magnets diameter of 120 mm and an air gap of 5 mm between the magnetic coupling halves, the change in the transmitting torque of the magnetic coupling is shown to attain without changing its overall dimensions. Variation in the transmission torque of the magnetic coupling is possible by changing the shape, size and brand of permanent magnets, while leaving the same number of magnets in each of the half-coupling.

Change in torque transmitted by a standard magnetic coupling with the same overall dimensions, depending on the grade of permanent magnet and its dimensions

2021 ◽  
pp. 30-34
Author(s):  
Keyword(s):  
Permanent Magnet ◽  
Permanent Magnets ◽  
Magnetic Coupling ◽  
Coupling Constant ◽  
Air Gaps ◽  
Neodymium Iron Boron ◽  
Magnetic Couplings ◽  
Magnetic Coupling Constant

The possibility of changing the torque transmitted by a cylindrical magnetic coupling, depending on the brand of a high-coercive permanent magnet — neodymium— iron—boron, samarium—cobalt is considered. Using the example of standard magnetic couplings with a diameter of 133 mm for magnets and air gaps between the half couplings for magnets of 5 and 7 mm, the change in the torque transmitted by the magnetic coupling without changing its overall dimensions is shown. Varying the torque of the magnetic coupling is possible by changing the shape, size and grade of permanent magnets while keeping the same number of magnets in each of the half-couplings of the magnetic coupling constant. Keywords; magnetic coupling, permanent magnet, number of magnets. [email protected]

Development of Magnetic Coupling Utilizing Magnetic Material Attached Magnetic-Flux Concentrated Surface Permanent Magnet Arrangement

2014 ◽  
Vol 792 ◽  
pp. 159-164
Author(s):  
Takuya Hirakawa ◽  
Takashi Todaka ◽  
Masato Enokizono
Keyword(s):  
Magnetic Material ◽  
Magnetic Flux ◽  
Permanent Magnet ◽  
Flux Density ◽  
Vessel Wall ◽  
Permanent Magnets ◽  
Magnetic Coupling ◽  
Air Gap ◽  
Magnetic Flux Density

This paper presents a magnetic coupling for a large-sized mixer, which is separated by a vessel wall. In order to improve the transmission-torque, the magnetic material attached magnetic-flux concentrated surface permanent magnet (MCSPM) arrangement is applied to the magnetic coupling and the construction is optimized. The results show that the MCSPM arrangement is very effective to improve the air-gap magnetic flux density and the transmission torque even quantity of very few permanent magnets.

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

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.

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

Energies ◽  
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.

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

Sensors ◽  
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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