Suwanngam, Warachart
Loading...
Preferred name
Suwanngam, Warachart
Alternative Name
Suwan-Ngam, Warachart
Suwan-Ngam, W.
Main Affiliation
Email
warachart.su@kmitl.ac.th
7 results
Now showing 1 - 7 of 7
- Some of the metrics are blocked by yourconsent settings
Item type:Publication, Comparison of Reduced-Length FFT-Based Feature for Induction Motor Fault Classification(2025-01-01); ; This research presents a comparison of FFT-based features which can be used for classifying induction motor faults via neural network. In this paper, the misalignment and rotor bar damage faults are investigated by using stator current as input data only. As the length of the full FFT can include both informative data corresponding to the faults and uninformative data such as noise from environment or electrical supply, only relevant magnitude from FFT bins should be selected and used instead. This paper proposed to use threshold level determined from the magnitude of FFT bins in dataset as a criterion for the selection. From experimental results, an input feature vector created by proposed method can create short input feature vector length to be used by neural network efficiently. The trained neural network performs classification task at 99.98% in accuracy. Comparing to using dimension reduction by PCA, thresholding method needs basic computation, and yields result close to PCA method. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, A PSPWM with variable frequency control for a two-output three-level series resonant inverter(2015-08-17); This research paper presents a two-output three-level series resonant inverter by using phase-shifted pulse width modulation with a variable frequency control technique. In order to achieve the boundary condition of operation under ZVS for all switches, this paper will analyze this condition which depends on operating frequency and phase-shifted angle between the gate signals of the outer switches and the inner switches. In addition, the proposed circuit was designed, built and tested. The test has two cases which include fixed frequency control and variable control method. From the experiment, the fixed frequency control cannot obtain the ZVS condition of switches for all phase-shifted angle values. On the other hand, the variable frequency control can maintain the ZVS condition for all phase-shifted angle values that is in line with the proposed concept. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Suitable power transformers for solar farm applications(2015-08-17); This paper presents a suitable power transformer for solar farm applications. Losses and economic value of the proposed transformer are compared to those of the standard transformer, for the application to a 1 MW solar farm, to help the solar farm owners select the best solution for their business. In this paper, a power electronics transformer called a Solid State Transformer (SST) is also proposed for the application to the solar farm because of its light weight, small size and varieties of functions. There are no core losses during no operation period which is about 15-16 hours a day. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Efficiency improvement of a dual-active-bridge isolated bidirectional DC-DC converter(2019-07-01) - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Low-Cost System for Investigating a Small Motor Fault Classification Based on Current Signal(2025-01-01); ; This research presents low-cost system for motor fault classification. This system uses a microcontroller with built-in ADC and communication capability. The two purposes of this article are to investigate the quality of the system for data acquisition and capability of the system for detecting early motor faults both by microcontroller on the system and personal computer. The embedded software on the system is designed to record current signals from a current sensor, compute FFT-based features and classify the fault based on tinyML method. Data communication between the system and the personal computer can be done by both serial port and TCP socket over Wi-Fi. The performances of the system and the personal computer are compared by the experiment as well as the quality of data recorded from the built-in ADC and a digital oscilloscope. The broken rotor bar and bearing fault in a 2.2kW induction motor are investigated. The classifier used in the experiment is a small feed forward neural network which can be implemented on both the proposed low-cost system and the personal computer. Although the recorded electrical current data by built-in ADC is contaminated with noise, the fault classification on the personal computer yield accuracy up to 90%. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Design and Evaluation of a Reliable Automated ECU Reprogramming Framework(2025-01-01); Reliable reprogramming of Electronic Control Units (ECUs) is vital for safety and functional integrity in modern vehicles. Manual flashing methods remain prone to human errors, inconsistent outcomes, and scalability issues. This research introduces an automated ECU flashing or reprogramming framework using the Vector Toolchain, combining Flash Pack automation with Unified Diagnostic Services (UDS) routines to ensure structured and repeatable processes. Large-scale experiments across multiple ECUs were conducted to assess robustness, error recovery, execution time, and scalability, supported by comprehensive logging and automated reporting for traceability. Experiments on multiple ECUs show reduced errors, faster execution, and improved scalability with success rate more than 80%. The proposed approach enhances reliability and reproducibility in large-scale as well as provides methodological insights and foundation flashing issue analysis for future research. - Some of the metrics are blocked by yourconsent settings
Item type:Publication, Application of the DC-link current sensors of the back-to-back converters for the operation of a doubly-fed induction generator(2016-01-18); The aim of this paper is to propose the application of the DC-link current sensors of the back-to-back converters for operation of a doubly-fed induction generator (DFIG). The operation of the DFIG is first discussed. The measured DC-link currents are used reconstruct the AC current waveforms for operation of the DFIG under different operating modes. The feasibility of the proposed application is investigated by simulation and experiment. The limitations of the proposed topology are discussed. The fault tolerant operation while the fault occurs at the AC current sensors is also discussed.