Eddy current braking experiment using brake disc from aluminium series of A16061 and A17075

Baharom, Mohamad Zairi; Nuawi, Mohd. Zaki; Priyandoko, Gigih; Harris, S. M.

doi:10.1088/1757-899x/36/1/012005

Cited by 18 publications

(11 citation statements)

References 5 publications

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“…Eddy currents are induced in moving conductive materials embedded in a magnetic field. Induced eddy currents find applications in levitation, in electricity generation, or can be used in position sensors and electromagnetic brakes . For MACS NMR, induced eddy currents are entirely parasitic, causing heating and slowing down the MAS rotor, and hence should be kept to an absolute minimum.…”

Section: Limitations Imposed Due To Spinning In the Presence Of Straymentioning

confidence: 99%

Capacitor re‐design overcomes the rotation rate limit of MACS resonators

Adhikari

Wallrabe

Badilita

et al. 2017

Concepts Magn Reson

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The magic angle coil spinning (MACS) technique has provided a breakthrough in enhancing sensitivity in magic angle spinning (MAS) NMR. However, efforts in improving the MACS detector for higher spinning speeds have been lacking. One published MACS construction technique is to solder a handwound solenoidal coil to a commercial non-magnetic capacitor and subsequently centering the detector inside the MAS rotor. An alternative method to realize these detectors is by using MEMS fabrication at the wafer scale, potentially capable of achieving reproducible MACS detectors. However, it is also important that the performance of the sensors does not deteriorate as a result of microfabrication constraints. The footprint of the detectors is a limiting factor in achieving higher spinning speeds. One of the key elements of a micro-resonator is its tuning capacitor, whose geometry has a significant influence on its electrical and mechanical performance. The quality factor of the capacitor, along with the induced eddy currents, are the key performance parameters considered. The article addresses these concerns by presenting a study of microfabricated on-chip capacitors for magic angle coil spinning (MACS) detectors. The capacitors are juxtaposed with commercially available capacitors and the most suitable fit to be integrated with a micro-coil is established.K E Y W O R D S eddy currents, magic angle coil spinning, MEMS fabrication, quality factor

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Section: Limitations Imposed Due To Spinning In the Presence Of Straymentioning

confidence: 99%

Capacitor re‐design overcomes the rotation rate limit of MACS resonators

Adhikari

Wallrabe

Badilita

et al. 2017

Concepts Magn Reson

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“…where µ r is the relative permeability of the material. Thus, the total braking power generated by the ECB can be calculated by substituting Equations (2) and 3into Equation 1, resulting in Equation 4, as given below.…”

Section: Governing Equationmentioning

confidence: 99%

“…A magnetic material with a high permeability will provide a high flux density [1], whereas an eddy current could effectively be generated if the current flows on a material with a low electrical resistance. It can usually be provided by nonmagnetic materials [2]. Besides the influence of the conductor material, the amount of braking torque generated by the ECB is proportional to the density of the magnetic field in the air gap [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach on the Unipolar Axial Type Eddy Current Brake Model Considering the Skin Effect

et al. 2020

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The braking torque mathematical modelling in electromagnetic eddy current brake (ECB) often ignores the skin effect that occurrs during operation. However this phenomenon can not be simply neglected. Therefore, this paper presents a mathematical model of braking torque for a unipolar axial type of ECB system with a non-magnetic disk, which considers the skin effects. The use of mathematical models that consider the existence of skin effects is significant in approaching the braking torque according to the actual condition. The utilization of generic calculations to the model of the ECB braking torque leads to invalid results. Hence, in this paper, the correction factor was added to improve the braking torque calculation as a comparator to the proposed equation. However, the modification and addition of the correction factor were only valid to estimate the low-speed regimes of torque, but very distant for the high-speed condition. From the comparison of calculated values using analytical and 3D modelling, the amount of braking torque at a low speed was found to have an average error for the equation using a correction factor of 1.78 Nm, while after repairing, a value of 1.16 Nm was obtained. For the overall speed, an average error of 14.63 Nm was achieved, while the proposed equation had a small difference of 1.79 Nm. The torque difference from the calculation results of the proposed model with the measurement value in the experiment was 4.9%. Therefore, it can be concluded that the proposed equation provided a better braking torque value approach for both low and high speeds.

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“…To overcome this, AC power is used [31][32][33]. In the conductor, addition of different metal alloy elements to the conductor produces different performance [34]. The braking force on ECB is influenced not only by the magnetic flux density but also the distribution.…”

Section: Unipolar Axial Ecbmentioning

confidence: 99%

Mini review on the design of axial type eddy current braking technology

Waloyo¹,

Ubaidillah²,

Tjahjana³

et al. 2019

IJPEDS

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Eddy Current Brake (ECB) is a type of electric braking that uses eddy current to produce braking forces. This article delivers a solid review of the design of Axial ECB, which is very promising for an alternative braking system. Several types of axial ECB are classified and named as a single disk, double disk, and unipolar model. The classification of axial ECB is based on the design of coil placement, which induces axial area of the disk as well as the electromagnet source. A potential issue for the development of axial ECB is also discussed to explore the braking performance improvement of the axial type ECB. It was highlighted that research on how to change the direction of magnetic field vectors by changing the shape of the pole-shoe on the electromagnetic ECB in axial type has not been widely studied. Therefore, this issue would be interesting for future investigation.

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Eddy current braking experiment using brake disc from aluminium series of A16061 and A17075

Cited by 18 publications

References 5 publications

Capacitor re‐design overcomes the rotation rate limit of MACS resonators

Capacitor re‐design overcomes the rotation rate limit of MACS resonators

A Novel Approach on the Unipolar Axial Type Eddy Current Brake Model Considering the Skin Effect

Mini review on the design of axial type eddy current braking technology

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