Articles
<![CDATA[Torque improvement of PM motor with semi-cycle stator design using 2D-finite element analysis ]]>
<![CDATA[Kwang T. C.]]>;
<![CDATA[Mohd Luqman Mohd Jamil]]>;
<![CDATA[Auzani Jidin]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 9, No 6: December 2019 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v9i6.pp5060-5067
<![CDATA[This paper presents sizing approaches to improve output torque performance in PM motor when partial stator body is removed. As the output torque performance is directly proportional to the electric loading, Q, modification on stator geometry affects the output torque performance and special procedures have to be taken to restore the desired output torque capability. Influences of split ratio, tooth body width, airgap and magnet thickness of magnet in PM motor with asymmetry stator design are carried out and the performance verification are referred to the back-emf, average output torque, torque ripple as well as cogging torque. From the investigation using 2D-Finite Element Analysis, optimum size of tooth body width and optimum number of coil turns result better output torque while other sizing approaches result no significant change as quick saturation took place.]]>
<![CDATA[Improved magnetic behavior of hemicycle PM motor via stator modification ]]>
<![CDATA[Kwang T. C.]]>;
<![CDATA[Mohd Luqman Mohd Jamil]]>;
<![CDATA[Auzani Jidin]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 10, No 3: June 2020 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijece.v10i3.pp3323-3332
<![CDATA[This article presents the simple basic sizing approaches to decrease overall weight of motor and improve magnetic characteristics in PM motor. A review on various stator design in PM motor i.e. radial-flux or axial-flux with slotted or non-slotted is presented. As magnetic and electric loading influence the electromagnetic motor performance, modification on stator body are included in investigation for a desired electromagnetic torque performance. Influences of tooth body width sizing and additional stator slots sizing in PM motor equip with hemicycle stator design are carried out. Two designs are included, both having similar semi-circle stator but different in additional slot tooth within and over 180 ○ i.e. Design 2 and 3 respectively. For optimization using 2D-Finite Element Analysis, optimal tooth body sizing and additional stator tooth result the weight significantly reduce by 44%, 5.9 Nm output torque and 30% torque ripple.]]>
<![CDATA[Strategies for FPGA Implementation of Non-Restoring Square Root Algorithm ]]>
<![CDATA[Tole Sutikno]]>;
<![CDATA[Aiman Zakwan Jidin]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Nik Rumzi Nik Idris]]>
<![CDATA[ International Journal of Electrical and Computer Engineering (IJECE) Vol 4, No 4: August 2014 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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<![CDATA[This paper presents three strategies to implement non restoring square root algorithm based on FPGA. A new basic building block is called controlled subtract-multiplex (CSM) is introduced in first strategy which use gate level abstraction. The main principle of the method is similar with conventional non-restoring algorithm, but it only uses subtract operation and append 01, while add operation and append 11 is not used. Second strategy presents the first strategy in register transfer level (RTL) abstraction. In third strategy, a modification for the implementation of conventional non-restoring algorithm is presented which also use RTL abstraction. The all above strategies is implemented in VHDL programming and adopt fully pipelined architecture. The strategies have conducted to implement successfully in FPGA hardware, and each of the strategies is offer an efficient in hardware resource. In generally, the third strategy is superior.DOI:http://dx.doi.org/10.11591/ijece.v4i4.6008]]>
<![CDATA[Speed and Position Estimator of Dual-PMSM for Independent Control Drives using Five-Leg Inverter ]]>
<![CDATA[Jurifa Mat Lazi]]>;
<![CDATA[Zulkifilie Ibrahim]]>;
<![CDATA[MD Hairul Talib]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Tole Sutikno]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 8, No 2: June 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v8.i2.pp612-622
<![CDATA[Nowadays, A lot of industry requires Multi Motor System (MMS) applications such as propulsion and traction power, HEV, conveyer and air-conditioner. The Conventional arrangement for MMS usually done by cascading the motors drives which each drives has individual inverter. Part of MMS, Dual-Motor drives fed by a single inverter is being paid attention by the researchers. Dual-motor drives using a single three-leg inverter has its limitation in the case of different operating conditions and independent speed control requirement. Therefore, dual-Motor drives using a single Five-leg Inverter (FLI) was proposed for independent control for both motors. In PMSM drives, the information of the feedback speed and rotor angular position is compulsory for variable speed drives. Conventional solution is by using speed sensor which will increase size, cost, extra hardwire and feedback devices, especially for the case of dual-PMSM drives. The best solution to overcome this problem is by eliminating the usage of speed and position sensors for Dual-motor drives. This paper presents a new sensorless strategy using speed and position estimator for Independent Dual- Permanent Magnet Synchronous Machine (PMSM) drives which utilize Five-Leg Inverter (FLI). The proposed strategy is simulated using MATLAB/Simulink to evaluate the overall motor drive performance. Meanwhile the experimental set-up is connected to dSPACE 1103 Board. The experimental results demonstrate that the proposed estimator is successfully managed to control the Dual-PMSM drives for variation of speed and for different direction applications.]]>
<![CDATA[Design and Development of Grid-connected Quasi-Z-Source PV Inverter ]]>
<![CDATA[Zulhani Rasin]]>;
<![CDATA[Muhammed Fazlur Rahman]]>;
<![CDATA[Maaspaliza Azri]]>;
<![CDATA[Md Hairul Nizam Talib]]>;
<![CDATA[Auzani Jidin]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 9, No 4: December 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v9.i4.pp1989-2005
<![CDATA[An inverter system applied with the PV source typically has a problem of lower input voltage due to constraint in the PV strings connection. As a countermeasure a DC-DC boost converter is placed in between to achieve a higher voltage at the inverter DC link for connection to the grid and to realize the MPPT operation. This additional stage contributes to losses and complexity in control thus reducing the overall system efficiency. This work discussed on the design and development of a grid-connected quasi-Z-source PV inverter which has different topology and control method compared to the conventional voltage source inverter and able to overcome the above disadvantages. Modelling and performance analysis of the voltage and current controller to achieve a good power transfer from the PV source, as well sycnchronization with the grid are presented in detail. Results from both simulation and experimental verification demonstrate the designed and developed grid-connected qZSI PV inverter works successfully equivalent to the conventional voltage source inverter system.]]>
<![CDATA[Design of Hollow-Rotor Brushless DC Motor ]]>
<![CDATA[Raja Nor Firdaus Raja Othman]]>;
<![CDATA[Farina Sulaiman]]>;
<![CDATA[Suhairi Rizuan]]>;
<![CDATA[Kasrul Abdul Karim]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Tole Sutikno]]>;
<![CDATA[Norhisam Misron]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 7, No 2: June 2016 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v7.i2.pp387-396
<![CDATA[This paper discusses about design of hollow-rotor Brushless DC (BLDC) motor. A conventional BLDC motor has more leakage flux circling at the end of the permanent magnet that will limit torque. To overcome this problem, a new BLDC model known as hollow-rotor is proposed. The objective of this research is to design a hollow-rotor motor that will have higher torque density compared to conventional BLDC motor using Finite Element Method (FEM). In addition, performance analysis of the proposed hollow-rotor has also been carried out. For validation, the result of FEM is compared with the measurement result. It shows that, the simulation result has good agreement with the measurement result. For comparison, hollow-rotor shows higher torque density compared to conventional BLDC motor. As a conclusion, this paper provides guidelines and analysis in designing high torque hollow-rotor motor.]]>
<![CDATA[Review and Comparison of Sensorless Techniques to Estimate the Position and Speed of PMSM ]]>
<![CDATA[Yusnida Ahmad Tarmizi]]>;
<![CDATA[Kasrul Abdul Karim]]>;
<![CDATA[S. Azura Ahmad Tarusan]]>;
<![CDATA[Auzani Jidin]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 8, No 3: September 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v8.i3.pp1062-1069
<![CDATA[Sensorless technique becomes popular nowadays in electrical drive applications specificially for AC motor drive. It is applied to determine and estimate the rotor position especially for PMSM motor. This paper presents the comparison sensorless technique to determine and estimate the position and rotor of PMSM motor. PMSM motor is widely used in industrial and automation due to its high performance motor drive. However, the location of PMSM motor in humidity and harsh environment causing the accuracy of motor is inaccurate due to deterioration of position sensor . Therefore, many sensorless techniques have been proposed by previous researchers in order to solve the problem. This paper presents the review of several categories; Model Based Method, Saliency Based Method and Signal Injection, and Artificial Intelligence Based Estimator. In addition, sensorless techniques on each category have been compared and described in terms of their advantages and disadvantages.]]>
<![CDATA[FPGA Based Optimized Discontinuous SVPWM Algorithm for Three Phase VSI in AC Drives ]]>
<![CDATA[Tole Sutikno]]>;
<![CDATA[Nik Rumzi Nik Idris]]>;
<![CDATA[Auzani Jidin]]>;
<![CDATA[Mohd Hatta Jopri]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 3, No 2: June 2013 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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<![CDATA[The discontinuous space vector pulse width modulation (SVPWM) has well-known that can reduce switching losses. By simplifying the thermal management issues, the discontinuous SVPWM can potentially reduce the inverter size and cost. However, using the modulation due to different time interval equations for each sector can introduce glitches at the points when the sector is changed. The more main problem, it can increase unwanted harmonic content and current ripple. Consider the decrease in switching losses associated with discontinuous modulation allows the system to utilize a higher switching frequency, this paper present high frequency switching of optimized discontinuous SVPWM based on FPGA to overcome the problems above. The proposed SVPWM has been successfully implemented by using APEX20KE Altera FPGA to drive on a three phase inverter system with 1.5 kW induction machine as load. The results have proved that the method can reduce harmonic content and current ripple without glitches.DOI : http://dx.doi.org/10.11591/ijpeds.v3i1.735]]>
<![CDATA[Photovoltaic Emulator for Grid-connected Quasi-Z-Sorce Inverter ]]>
<![CDATA[Zulhani Rasin]]>;
<![CDATA[Muhammed Fazlur Rahman]]>;
<![CDATA[Maaspaliza Azri]]>;
<![CDATA[Md Hairul Nizam Talib]]>;
<![CDATA[Auzani Jidin]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 9, No 4: December 2018 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v9.i4.pp1976-1988
<![CDATA[The performance of PV panel is very much dependent on the amount of sun light as well as the temperature of the surrounding environment which normally hard to be predicted. The use of PV emulator in the investigation of solar inverter especially at a lab scale platform helps to mitigate the inconsistency factors due to this uncontrollable variation. This work discussed on the design and development of a PV emulator for the grid-connected quasi-Z-source inverter which has different topology and control method compared to the conventional voltage source inverter. The I-V characteristics of the PV panel is modelled from the commercially available product and through circuit analysis the relation between capacitor voltage control and the PV terminal voltage is established, thus realizing the MPPT operation. Results from both simulation and experimental verification demonstrated that the PV emulator successfully able to produce power for the inverter according to the requirement.]]>
<![CDATA[Selective Harmonic Elimination Based on Newton-raphson Method for Cascaded H-bridge Multilevel Inverter ]]>
<![CDATA[Wahidah Abd Halim]]>;
<![CDATA[Tengku Noor Ariana Tengku Azam]]>;
<![CDATA[Komathi Applasamy]]>;
<![CDATA[Auzani Jidin]]>
<![CDATA[ International Journal of Power Electronics and Drive Systems (IJPEDS) Vol 8, No 3: September 2017 ]]>
Publisher : <![CDATA[Institute of Advanced Engineering and Science ]]>
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DOI: 10.11591/ijpeds.v8.i3.pp1193-1202
<![CDATA[Multilevel inverters are emerging as the new breed of power converter options for high power applications. They typically synthesis the staircase voltage waveform (from several dc sources) which reduced harmonic content. This paper presents a simple selective harmonic elimination (SHE) modulation for single-phase cascaded H-bridge (CHB) multilevel inverter. The optimum switching angle of the transcendental equations describing the fundamental and harmonic components is solved by means of the Newton-Raphson (NR) method. The proposed SHE scheme is performed through simulation using MATLAB/Simulink. This simulation results are then verified through experiment using Altera DE0-Nano field-programmable gate array (FPGA). The proposed SHE is efficient in eliminating the lowest-order harmonics and producing a higher quality output waveform with a better harmonic profile. ]]>
