Rancang Bangun Sistem Magnetik Bearing Levitasi untuk Peningkatan Efisiensi Motor DC dengan Menggunakan Metode Halbach Array

Abstract

Bearings are machine elements that function to support loads when two machine elements move relative to each other. Every object that moves relatively will definitely cause friction. Any friction that occurs will definitely cause wear which will affect the service life of the element. In conventional bearings, ball bearings are used to reduce friction losses so that they can reduce mechanical losses and can maximize the net output of rotation in DC motors. Magnetic levitation bearing technology will produce a lifting force that hovers over the rotor by utilizing the repulsion of magnetic poles. Very low coefficient of friction, in addition magnetic bearings do not require additional power for the control system and do not require lubricating fluid supply or disposal. The author anticipates axial instability by using the Halbach array method. This method can produce an increase in the magnetic field on one side of the array by canceling the magnetic field on the other side until it approaches zero. This method will produce a spatially rotating magnetization pattern. In this research the author will design a magnetic levitation bearing using N52 Neodymium permanent magnets with the Halbach array method in a permanent magnet configuration. Based on the results of the analysis in this study, the use of magnetic levitation bearings using the Halbach array method can reduce mechanical losses thereby increasing the efficiency of the DC motor by 4,23% and can reduce the temperature of a DC motor when operating by 1,78%.