An optimized soft actuator based on the interaction between an electromagnetic coil and a permanent magnet

2021 ◽  
pp. 111-134
Author(s):  
Nafiseh Ebrahimi ◽  
Paul Schimpf ◽  
Amir Jafari
Keyword(s):  
Permanent Magnet ◽  
Soft Actuator ◽  
Electromagnetic Coil

An Electron Microscope for High Quality Low Magnification with a Wide Field

1977 ◽  
Vol 35 ◽  
pp. 88-89 ◽  
Author(s):  
M. Kubozoe ◽  
H. Sato ◽  
S. Kasai ◽  
S. Ozasa
Keyword(s):  
Permanent Magnet ◽  
Focal Length ◽  
Earth Metal ◽  
Effective Radius ◽  
Wide Field ◽  
High Quality ◽  
Electromagnetic Coil ◽  
A Value ◽  
Electron Lens ◽  
New Facility

A permanent magnet which is a combination of cobalt and some rare earth metal is recently being utilized. HICOREX is a commercial product of this magnet. Its maximum BH is several times larger than that of an ordinary Alnico magnet, providing a value of 10 n* 26 MGOe. When this permanent magnet is used for an electron lens (called HICOREX lens), not only does it offer a very strong lens but it can be made extremely small, and a new facility can be devised using this feature.A triple pole piece lens which is made by combining two HICOREX magnets enables relatively easy compensation of magnification distortion and spiral distortion, and its effective radius of field is about twice that of an ordinary lens excited with an electromagnetic coil. This HICOREX lens has a diameter of 16 mm and height of about 10 mm. Despite being so tiny its focal length is about 3 mm at 75 kV accelerating voltage (refer to Fig. 2).

A NEW ELECTROMAGNETIC VALVE TRAIN WITH PM/EM ACTUATOR IN SI ENGINES

2013 ◽  
Vol 37 (3) ◽  
pp. 787-796 ◽  
Author(s):  
Yaojung Shiao ◽  
Ly Vinh Dat
Keyword(s):  
Energy Consumption ◽  
Permanent Magnet ◽  
Optimal Parameter ◽  
Special Structure ◽  
Valve Train ◽  
Electromagnetic Valve ◽  
Electromagnetic Coil ◽  
Si Engines ◽  
Simulation Results ◽  
Actuator Control

This paper proposes a new electromagnetic valve train (EMV), which uses hybrid permanent magnet and electromagnetic coil (PM/EM). The new EMV is characterized by a special structure, simple actuator as well as optimal parameter designs. This EMV brings many benefits, such as valve dynamic, actuator control, and low operation energy consumption, etc. The simulation results show that this EMV achieves a 15% volume reduction and a 20% enhancement in holding force by special armature design. Additionally, the estimated energy consumption of EMV operation for the proposed EMV indicates that this EMV has the lowest operating energy compared with other EMVs.

NEW PERMANENT MAGNET DEVICES

1984 ◽  
Vol 45 (C1) ◽  
pp. C1-285-C1-291 ◽  
Author(s):  
R. Pauthenet
Keyword(s):  
Permanent Magnet

A novel analytical calculation of magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping

2020 ◽  
pp. 1-15
Author(s):  
Jianqi Li ◽  
Yu Zhou ◽  
Jianying Li
Keyword(s):  
Magnetic Field ◽  
Conformal Mapping ◽  
Permanent Magnet ◽  
Flux Density ◽  
Analytical Method ◽  
Electromotive Force ◽  
Analytical Calculation ◽  
Air Gap ◽  
Permanent Magnet Machines ◽  
Peak Value

This paper presented a novel analytical method for calculating magnetic field in the slotted air gap of spoke-type permanent-magnet machines using conformal mapping. Firstly, flux density without slots and complex relative air-gap permeance of slotted air gap are derived from conformal transformation separately. Secondly, they are combined in order to obtain normalized flux density taking account into the slots effect. The finite element (FE) results confirmed the validity of the analytical method for predicting magnetic field and back electromotive force (BEMF) in the slotted air gap of spoke-type permanent-magnet machines. In comparison with FE result, the analytical solution yields higher peak value of cogging torque.

Performance analysis of magnetic gear with Halbach array for high power and high speed

2020 ◽  
Vol 64 (1-4) ◽  
pp. 959-967
Author(s):  
Se-Yeong Kim ◽  
Tae-Woo Lee ◽  
Yon-Do Chun ◽  
Do-Kwan Hong
Keyword(s):  
Permanent Magnet ◽  
Eddy Current ◽  
High Power ◽  
High Speed ◽  
Torque Ripple ◽  
Eddy Current Loss ◽  
Element Analysis ◽  
Current Loss ◽  
Halbach Array ◽  
Magnetic Gear

In this study, we propose a non-contact 80 kW, 60,000 rpm coaxial magnetic gear (CMG) model for high speed and high power applications. Two models with the same power but different radial and axial sizes were optimized using response surface methodology. Both models employed a Halbach array to increase torque. Also, an edge fillet was applied to the radial magnetized permanent magnet to reduce torque ripple, and an axial gap was applied to the permanent magnet with a radial gap to reduce eddy current loss. The models were analyzed using 2-D and 3-D finite element analysis. The torque, torque ripple and eddy current loss were compared in both models according to the materials used, including Sm2Co17, NdFeBs (N42SH, N48SH). Also, the structural stability of the pole piece structure was investigated by forced vibration analysis. Critical speed results from rotordynamics analysis are also presented.

Analysis of structure factors affecting suspension force of permanent magnet system with variable magnetic flux path control

2020 ◽  
Vol 64 (1-4) ◽  
pp. 1495-1504
Author(s):  
Fangchao Xu ◽  
Yongquan Guo ◽  
Ran Zhou ◽  
Junjie Jin ◽  
Chuan Zhao ◽  
...  
Keyword(s):  
Magnetic Flux ◽  
Permanent Magnet ◽  
System Structure ◽  
Magnet System ◽  
Load Torque ◽  
Factors Affecting ◽  
Annular Gap ◽  
Path Control ◽  
Structure Factors ◽  
Flux Path

To solve the problem of reduction of suspension force of permanent magnet system with variable magnetic flux path control, according to the structure of the system, suspension principle of the permanent magnet system with variable magnetic flux path control and the generation principle of the load torque, the influence of the mechanical structure of the system on the suspension force is analyzed by changing part of parameters of the system structure. The results show that the existence of magnetic isolation plate is the main reason for the decrease of suspension force, the permanent magnet ring can be thickened to 11.91 mm, the annular gap can be reduced to 1 mm, thickness of the “F” shaped magnetizer can be increased to 9 mm to increase the suspension force.

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