Ikhrahmadani, Rahmat (2018) Pengaruh Variasi Ketebalan Batang Magnet Dan Air Gap Terhadap Torsi Pada Radial Magnetic Spur Gear Tipe Eksternal. Undergraduate thesis, Institut Teknologi Sepuluh Nopember.
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Abstract
Magnetic gear memanfaatkan gaya magnet pada bahan magnet untuk menggerakkan rotor, dimana mekanisme frictionless ini dikarenakan adanya celah diantara rotor yang disebut air gap. Dengan mekanisme tanpa kontak, maka magnetic gear tidak akan mengalami kerugian seperti munculnya panas, getaran, suara bising dan kerusakan akibat gaya gesek. Selain itu perawatan akan lebih sederhana tanpa sistem pelumasan. Akan tetapi, magnetic gear masih memiliki kelemahan yaitu torsi densitas yang dihasilkan lebih rendah daripada mechanical gear. Oleh karena kelemahan tersebut, penelitian ini dilakukan untuk mencari cara meningkatkan torsi densitas pada magnetic gear. Kemampuan kerja magnetic gear dipengaruhi oleh beberapa hal yaitu bahan magnet, geometri (tebal) batang magnet, dan besar jarak air gap. Untuk mengetahui pengaruh hal tersebut terhadap reability magnetic gear maka dilakukan simulasi dengan metode finite element dengan menggunakan software Ansys dan FEMM.
Simulasi dilakukan dengan menetapkan bahan magnet yaitu Neodymium Iron Boron Magnets (NdFeB), rasio gear 1:2, dan jenis topologi radial spur magnetic gear tipe eksternal. Lalu variabel yang divariasikan yaitu besar air gap (1 mm, 2 mm, dan 3 mm) dan ketebalan batang magnet penyususn rotor. Terdapat tiga macam HS rotor dan LS rotor yang dipasangkan sehingga menjadi sembilan pasang magnetic gear (MG). Simulasi ini menghasilkan besaran nilai torsi maksimum (T) yang mampu diterima magnetic gear dan plot flux density (B).
Studi ini menunjukkan bahwa besar jarak air gap berbanding terbalik dengan besar torsi maksimum pada magnetic gear dimana torsi terbesar terdapat pada air gap 1 mm. Sedangkan ketebalan batang rotor berbanding lurus dengan besar torsi magnetic gear dimana pasangan magnetic gear yang memiliki torsi maksimum tertinggi yaitu magnetic gear ke-sembilan (MG 9) dengan ketebalan rotor paling besar, baik pada HS rotor maupun LS rotor. Hasil dari penelitian ini dapat menjadi informasi berupa spesifikasi dari geometri magnetic gear tertentu dan menjadi masukan dalam perkembangan magnetic gear.
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Magnetic gear use magnetic force from magnetic material to drive rotor, where the frictionless mechanism is due to a gap between rotor called air gap. With frictionless mechanism, magnetic gear will not experienc losses such as emergence of heat, vibration, noise, and damage due to friction. In additional, maintenance will be simpler without lubrication system. However, magnetic gear still has a weakness that is a lower torque. Maximum torque of magnetic gear is lower than mechanical gear. Therefore, this research was conducted to find out how to increase the torque on magnetic gear. The reability of magnetic gear is influnced by several things such us magnetic material, geometry or thickness of magnetic rod, and distance of air gap. To know the effect of it, than we do simulation with finite element method using FEMM and Ansys software.
The simulation is done by determining magnetic material ie Neodymium Iron Boron Magnets (NdFeB), 1:2 gear ratio, and type of topology is external radial magnetic spur gear. Then variable are the distance of air gap (1 mm, 2 mm, and 3 mm) and the thickness of magnetic rod. There are three kinds of high speed rotor and low speed rotor. They are paired each other, so it becomes nine pairs of magnetic gear. This simulation generates the maximum value of toque (T) and flux density plot (B).
This study shows that the distance of air gap was inversely proportional with maximum torque, where the highest torque was found in 1 mm air gap. While the tickness of magnetic rod was directly proportional with maximum torque, where the highest torque was found on the 9th magnetic gear. This 9th magnetic gear has largest magnetic rod thickness, either on high speed rotor and low speed rotor. The result of this study can be information in the form of specifications of spesific geometry of magnetic gear. It can also be a reference to further research on the effect of air gap and magnetic rod thickness to magnetic gear torque.
| Item Type: | Thesis (Undergraduate) |
|---|---|
| Additional Information: | RSM 621.433 Ikh a-1 3100017069017 |
| Uncontrolled Keywords: | Magnetic gear, torsi, air gap, ketebalan batang magnet, magnetic spur gear, Key word : Magnetic gear, torque, air gap, magnetic rod thickness, magnetic spur gear Magnetic gear, torque, air gap, magnetic rod thickness, magnetic spur gear |
| Subjects: | T Technology > TJ Mechanical engineering and machinery > TJ230 Machine design T Technology > TJ Mechanical engineering and machinery > TJ778 Gas turbines |
| Divisions: | Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Rahmat Ikhrahmadani |
| Date Deposited: | 22 Oct 2020 03:40 |
| Last Modified: | 22 Oct 2020 03:40 |
| URI: | http://repository.its.ac.id/id/eprint/55744 |
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