Power-Saving Magnetizing Device for Magnetorheological Fluid Control Using Permanent Magnet

In this research, a novel safety escape device based on magnetorheological fluid and permanent magnet is designed, manufactured, and tested. The safety escape device with magnetorheological fluid and permanent magnet can provide an increasing braking torque for a falling object by increasing the magnetic field intensity at the magnetorheological fluid. Such increase is realized by mechanically altering the magnetic circuit of the device when the object is falling. As a result, the falling object accelerates first and then decelerates to stop in the end. Finite element analysis is used to determine some of the specifications of the safety escape device for larger braking torque and smaller size. Finite element analysis results are also used for theoretical study and establishment of the dynamic model of the safety escape device. A prototype is realized and tested finally. The experimental test results show that the operation of the prototype conforms to the prediction by the dynamic model and validates the feasible application of magnetorheological fluids in developing falling devices.

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1204 Power-saving drive of giant-magnetostrictive actuator : Examination of position control using magnetic field of interior permanent magnet

The Proceedings of the Machine Design and Tribology Division meeting in JSME ◽

10.1299/jsmemdt.2010.10.63 ◽

2010 ◽

Vol 2010.10 (0) ◽

pp. 63-66

Author(s):

Yasukazu SATO ◽

Kazuki OKADA

Keyword(s):

Magnetic Field ◽

Permanent Magnet ◽

Position Control ◽

Power Saving ◽

Interior Permanent Magnet ◽

Magnetostrictive Actuator

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A Magnetorheological Fluid Yield Stress Measurement Platform by Movable Permanent Magnet

2018 Asia-Pacific Magnetic Recording Conference (APMRC) ◽

10.1109/apmrc.2018.8601026 ◽

2018 ◽

Author(s):

Ping-Hsun Lee ◽

Jen-Yuan Chang

Keyword(s):

Permanent Magnet ◽

Yield Stress ◽

Stress Measurement ◽

Magnetorheological Fluid

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A new measurement method for operation mode dependent dynamic behavior of magnetorheological fluid

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1177/0954406216646137 ◽

2016 ◽

Vol 231 (18) ◽

pp. 3358-3369 ◽

Cited By ~ 1

Author(s):

S Kaluvan ◽

JH Park ◽

YS Lee ◽

MS Han ◽

SB Choi

Keyword(s):

Permanent Magnet ◽

Measurement System ◽

Measurement Method ◽

Magnetorheological Fluid ◽

Electromagnetic Actuator ◽

Coupled Mode ◽

Mode Operation ◽

Damping Behavior ◽

Dynamic Damping ◽

Cantilever Rod

This paper presents a new measurement method to investigate the operational mode dependent dynamic behavior of magnetorheological fluid. The proposed measurement system is designed using an electromagnetically actuating cylindrical rod coupled with the magnetorheological fluid squeezing setup. The cylindrical rod is clamped to base at one end and the other end is free to move in the z- and y-axis. A disc-type permanent magnet is attached to the free end of the cantilever rod and an electromagnetic actuator is placed nearer to the permanent magnet. The magnetorheological fluid squeezing setup is mounted nearer to the fixed end. The magnetorheological squeezing setup is designed using two electromagnetic coils placed face to face in z-axis with the gap of “ d”. The magnetorheological fluid is placed between the gap “ d” to form the squeezing effect. The direction of vibration of the cantilever rod to bottom surface is determined by the angular position of electromagnetic actuator. The actuator position is fixed to the desired angle with the help of stepper motor setup. The horizontal direction of vibration of cantilever rod produces the shear mode operation of the magnetorheological fluid in the magnetorheological fluid squeezing setup. Similarly, the vertical and intermediate direction of vibration of rod produces the squeeze and coupled mode operation of the magnetorheological fluid, respectively. The analytical and experiment analyses to determine the dynamic damping behavior of the magnetorheological particles for various directions of actuation angle is undertaken using the proposed measurement system. The analytical model of the proposed measurement system is firstly derived and the experimental setup is then developed in real-time laboratory environment. The analytical and experimental results show that the dynamic damping behavior of squeeze mode operation of the magnetorheological fluid is superior to the shear and coupled mode operation of the magnetorheological fluid. The effectiveness and novelty of the proposed measurement system is demonstrated by presenting dynamic force variation and vibration amplitude reduction at different modes like squeeze, shear, and intermediate mode operation of the magnetorheological fluid.

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