Design of mover structure of a moving-magnet type linear motor utilizing magnetic-flux concentration-type permanent magnet arrangement

Linear motor eliminates the middle part of mechanical drive train, but because of structural characteristics of itself, must to take effective measures to reduce thrust fluctuations, or direct drive will lost its original meaning. In this paper, firstly research on detent force of moving magnet type permanent magnet synchronous linear servo motor and analyze the principle of generate detent force, secondly analyze the cogging force of moving magnet type permanent magnet synchronous linear motor and obtain the expression of cogging force maximum value, finally propose effective method to reduce detent force.

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A New Moving-magnet Type Linear Actuator utilizing Flux Concentration Permanent Magnet Arrangement

Journal of Electrical Engineering and Technology ◽

10.5370/jeet.2012.7.3.342 ◽

2012 ◽

Vol 7 (3) ◽

pp. 342-348 ◽

Cited By ~ 5

Author(s):

Akira Goto ◽

Takuya Okamoto ◽

Atsushi Ikariga ◽

Takashi Todaka ◽

Masato Enokizono

Keyword(s):

Permanent Magnet ◽

Linear Actuator ◽

Flux Concentration ◽

Moving Magnet

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Design and Analysis of Surface Permanent Magnet Vernier Linear Motor Based on Air Gap Magnetic Flux Density Distribution

2019 12th International Symposium on Linear Drives for Industry Applications (LDIA) ◽

10.1109/ldia.2019.8770990 ◽

2019 ◽

Cited By ~ 1

Author(s):

Hyoseok Shi ◽

Noboru Niguchi ◽

Katsuhiro Hirata

Keyword(s):

Magnetic Flux ◽

Density Distribution ◽

Permanent Magnet ◽

Flux Density ◽

Linear Motor ◽

Air Gap ◽

Magnetic Flux Density ◽

Flux Density Distribution

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Positioning Characteristics of a MEMS Linear Motor Utilizing a Thin Film Permanent Magnet and DLC Coating

International Journal of Automation Technology ◽

10.20965/ijat.2013.p0148 ◽

2013 ◽

Vol 7 (2) ◽

pp. 148-155 ◽

Cited By ~ 15

Author(s):

Ryogen Fujiwara ◽

◽

Tadahiko Shinshi ◽

Minoru Uehara ◽

Keyword(s):

Thin Film ◽

Permanent Magnet ◽

High Performance ◽

Motor System ◽

High Heat ◽

Linear Motor ◽

Two Phase ◽

Dlc Coatings ◽

Dlc Coating ◽

Moving Magnet

A high performance Nd2Fe14B/Ta thin film Permanent Magnet (PM) not only has a high remnant flux density and a high coercive force similar to those of a conventional sintered Nd2Fe14B magnet, but also has a high heat tolerance. Using a thin film PM, we developed a moving-magnet typeMEMS linearmotor consisting of a silicon slider including a multi-pole magnetized thin film PM, a linear guideway made from silicon, and a two-phase micro-coil. Diamond-Like Carbon (DLC) coatings were used in order to reduce the friction force between the slider and the guideway. The purpose of this study is to realize feedback positioning of the MEMS linear motor and to investigate the dynamics of the linear motor system. In a driving experiment, the minimum current and voltage to start the slider were less than 0.26 A and 0.6 V, respectively. In positioning tests, the positioning resolution and bandwidth were 100 µm and 54 Hz, respectively.

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

International Journal of Applied Electromagnetics and Mechanics ◽

10.3233/jae-209470 ◽

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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