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All Journal Dielektrika : Jurnal Ilmiah Kajian Teori dan Aplikasi Teknik Elektro
jati, I Ketut Wirya
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Computer Science & IT Electrical & Electronics Engineering Energy

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An Analysis of Induction Motor Based on Field Oriented Control with Modulation Techniques Carrier Based Pulse Width Modulation (CBPWM): : jati, I Ketut Wirya
DIELEKTRIKA Vol 9 No 2 (2022): DIELEKTRIKA
Publisher : Jurusan Teknik Elektro Fakultas Teknik Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dielektrika.v9i2.317

Abstract

Induction motors have the advantage of simple construction and lower prices. Induction motors have a weakness, namely that they are still coupling, where the interdependence of torque and flux at low speeds regulates the speed more complicated and cannot maintain a constant speed when there is a change in load. To keep the speed of the induction motor can be controlled properly, a method is needed, namely an induction motor using CBPWM with Vector Control. CBPWM can affect the speed of the induction motor, when the Modulation Index is 0.1 the motor speed is 75.03 Rpm and when the Modulation Index 1 the motor speed has an increase of 750 Rpm. From a series of simulations by setting the Modulation Index, as in m=1 it has a speed of 750 Rpm, Maximum Torque 12.1 Nm, Rise Time 0.28s, Settling Time 0.45s, Peak Time 0.93s, and Overshoot 0.01% . Then, the lowest THDi was found at the Modulation Index 1.0 at 1.21% and the lowest THDv was at the Modulation Index 1.1 at 64.91%.
Open-Loop Performance Analysis of Induction Motors under V/f Speed Control jati, I Ketut Wirya; Nyoman Wahyu Satiawan, I
DIELEKTRIKA Vol 12 No 2 (2025): DIELEKTRIKA
Publisher : Jurusan Teknik Elektro Fakultas Teknik Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/dielektrika.v12i2.422

Abstract

This study aims to analyze the performance of a three-phase induction motor with a speed control system based on the Volt per Hertz (V/f) method in an open-loop configuration, with a primary focus on reducing torque drop during low-frequency operation. The simulation was carried out using MATLAB/Simulink, where the model consists of an SPWM-based three-phase inverter, a standard Simulink induction motor, and an external mechanical load. The V/f method was applied to maintain constant stator flux by keeping the voltage-to-frequency ratio fixed (approximately 7.6 V/Hz). The input frequency was varied from 10 Hz to 50 Hz, both under no-load and loaded conditions. The observed performance parameters included rotor speed, electromagnetic torque, stator current, and motor slip. The simulation results show that the system can produce a linear relationship between frequency and rotor speed with low slip (<5%) under no-load conditions. However, under load conditions, there is a speed drop of around 4–5% that cannot be compensated due to the absence of a feedback system. The initial electromagnetic torque demonstrates a fast response with an overshoot of up to 150 Nm before stabilizing in the range of 100–120 Nm. The rotor speed reaches a steady-state condition in approximately 0.2 seconds, indicating good dynamic response. In conclusion, the open-loop V/f control system is effective and sufficiently efficient for light industrial applications that do not require high precision, such as fans and pumps. However, for applications that demand greater stability and dynamic response, further development toward a closed-loop system or sensor-based adaptive control is recommended to enhance control accuracy, energy efficiency, and system capability in responding to dynamic loads
Co-Authors I Nyoman Wahyu Satiawan