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All Journal Bulletin of Electrical Engineering and Informatics Jurnal Polimesin
Muhammad Irwanto
Universitas Prima Indonesia
Automotive Engineering Control & Systems Engineering Electrical & Electronics Engineering Engineering Materials Science & Nanotechnology Mechanical Engineering

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Design and implementation of a state feedback controller for enhanced speed stability of permanent magnet DC motors under load variations Mahdi Syukri; Rakhmad Syafutra Lubis; Melinda Melinda; Muhammad Hakkan Syukur; Iskandar Hasanuddin; Muhammad Irwanto
Jurnal Polimesin Vol 24, No 2 (2026): April
Publisher : Politeknik Negeri Lhokseumawe

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30811/jpl.v24i2.8379

Abstract

This study presents the design and simulation of a State Feedback Controller (SFC) for speed regulation of a Permanent-Magnet DC (PMDC) motor using a state-space modeling approach. The objective is to achieve stable and accurate speed control under dynamic load disturbances that typically degrade the performance of conventional open-loop systems. The Direct Current (DC) motor is modeled in state-space form, with armature current and angular speed selected as the main system states. Controller gains are designed using the pole placement method to ensure fast response and improved stability. The proposed SFC is evaluated through MATLAB®/Simulink® simulations by examining motor speed, armature current, and input voltage responses under step-load variations. Simulation results show that the SFC maintains the motor speed at the reference value of 3,430 rpm even during sudden load increases, whereas the uncontrolled motor experiences significant speed drops and oscillations. Performance analysis confirms notable improvements in transient response. The rise time is reduced from 1.1864 s to 0.4220 s, and the settling time decreases from 2.1132 s to 0.7517 s, indicating faster and more stable system behavior. In addition, smoother current transitions and more efficient voltage regulation are achieved compared to the open-loop configuration. Overall, the results demonstrate that state-space control using pole placement provides a robust and responsive alternative to conventional PID controllers for DC motor speed control under load disturbances. Future work will focus on experimental validation and the exploration of advanced control strategies such as Linear Quadratic Regulation and adaptive control.
Time-response modelling of an ice cream cone-shaped UWB antenna in the 5G spectrum for IoT applications Yoga Tri Nugraha; Adam Pangestu; Mawardi Mawardi; Muhammad Irwanto; Muzammil Jusoh
Bulletin of Electrical Engineering and Informatics Vol 15, No 1: February 2026
Publisher : Institute of Advanced Engineering and Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11591/eei.v15i1.10838

Abstract

The development of wireless communication technology, especially fifth-generation (5G) networks, requires ultra-wideband (UWB) antennas capable of supporting high-speed data transmission, low latency, and massive connectivity for internet of things (IoT) applications. This research proposes an ice cream cone shaped UWB antenna design with a semicircular patch, a conical transition structure, and a feed path, designed to produce a nearly omnidirectional radiation pattern with high efficiency. The design is modeled using CST Studio Suite for frequency domain analysis and MATLAB for time response analysis with a modulated Gaussian pulse signal input. Simulation results show that the antenna is able to maintain the input waveform with little amplitude attenuation and phase shift and maintain two dominant spectrum peaks at ±6 GHz without significant distortion. Return loss (S11) measurements show a bandwidth of 4.40 GHz(3.80–8.20 GHz) with a minimum value of –28 dB, while the voltage standing wave ratio (VSWR) is close to 1, indicating optimal impedance matching and low power reflection. The group delay is stable, and the 2D radiation pattern shows nearly omnidirectional characteristics. This antenna is deemed suitable for portable 5G IoT devices, with recommendations for physical fabrication and field testing.
Co-Authors Adam Pangestu Iskandar Hasanuddin Mahdi Syukri Mawardi Melinda Melinda Muhammad Hakkan Syukur Muzammil Jusoh Rakhmad Syafutra Lubis Yoga Tri Nugraha