Engineering and Technology Journal 40 (01) (2022) 207-216 Engineering and Technology Journal Journal homepage: https://etj.uotechnology.edu.iq 207 http://doi.org/10.30684/etj.v40i1.2206 Received 01 June 2021; Accepted 22 August 2021; Available online 25 January 2022 2412-0758/©Publishing rights belongs to University of Technology’s Press, Baghdad, Iraq. This is an open access article under the CC BY 4.0 license http://creativecommons.org/licenses/by/4.0 Optimization of Design Parameters for Manufacturing a Radial Active Magnetic Bearing with 12-Poles Mohamed N. Hamad * , Muhannad Z. Khalifa , Jamal A. K. Mohammed Electromechanical Engineering Dept., University of Technology, Baghdad-Iraq, Alsina'a street, 10066 Baghdad, Iraq. *Corresponding author Email: jawadimohamed79@gmail.com HIGHLIGHTS ABSTRACT • Designing a radial Active Magnetic Bearing (AMB) after performing an optimization process via reducing the number of poles. • Reduction of the complexities of the control system is inversely proportional to the number of poles. • It was noticed that increasing the rotational speed would increase the torque. • The model covered in this study is made of a material with good engineering and magnetic characteristics steel 37-2. This research aims to design an Active Magnetic Bearing (AMB) after performing an optimization process via reducing the number of poles and by reducing air gap, Dia. Yoke, and Z-length (deep of model). To increase the performance of a radial Active Magnetic Bearing (AMB), all particular equations of design based on the Genetic Algorithm method by using ANSYS Maxwell (Version 17.1) program of electro-magnetic have been studied. Manufacturing an active magnetic bearing standing for two counts, each one containing 12 poles instead of 16, led to a significant improvement in the performance. Some conclusions were obtained, including the complications in the control system will be reduced when they are linked in AMB. The complexities of the control system are inversely proportional to the number of poles and the model covered in this study is made of a material with good engineering and magnetic characteristics steel 37-2. ARTICLE INFO Handling editor: Muhsin J. Jweeg Keywords: Active magnetic bearing Air gap Optimal design ANSYS Maxwell 1. Introduction Active Magnetic Bearings (AMBs) are used mainly in high-speed machinery due to their contactless operation. The large size of the AMB is one of its main drawbacks. It may be thought of in Compact AMBs with a higher load-carrying capacity to better use of space and material available. In light of this, an attempt was made by Rao and Kakoty [1] for designing compact AMBs to get higher load-carrying capacity. Two main parameters are considered, namely the leg shape and the pattern of the pole winding. The effect of these parameters on the load-carrying capacity as well as the AMB size has been evaluated. Yeh [2] proposed a semi-AMB system that includes both the passive and active magnetic bearings for rotatory machine applications. In particular, the issues of the design, the analysis, and the control of the semi-active system were investigated using an axial fan as the platform. In the proposed system, while the rotor is axially lifted by the active bearing, its tilting and radial stability are ensured by the passive bearings. Martynenko [3] had found a way to reduce the vibration amplitudes of turbo-machinery rotors with passive and active magnetic bearings in resonances and resonance areas corresponding to one of the critical speeds ranging from zero to those operating rotations. The method is based on the ability to change the nonlinear strength and the damping properties of the novel design of the PMBs and AMBs via varying the electrical parameters of electromagnet circuits. They confirmed the possibility of using passive/active magnetic suspensions for rotors having lightweights (e.g., compressors and expanders) with the achievement of the proposed method of detuning from resonance situations. Anshan et al. [4] studied a rotor that serves as a rotating structure driven by a 4KW AC motor through couplings and suspended by an active magnetic bearing with its position Sensors and Hall Effect Sensors connected in place connected to the main computer. A digital link that interfaces between the DSP and the general mathematics program are made to run on the computer in which all the forces and the displacement signals are available in analog which then processed and finally display