211 research outputs found
Energy Saving Through Development of New Copper Rotor of Induction Motor
No full textProf. Dr. Ismail Daut and his team won silver at 21st International Invention, Innovation and Technology Exhibition (ITEX) 2010, 14th - 16th May 2010 di Kuala Lumpur Convention Centre (KLCC), Kuala Lumpur, Malaysia.This product describes the importance of induction motors is aimed at contributing to energy saving efforts. To investigate induction motor efficiency and loss parameters using new copper rotors. New copper rotors are compared with existing aluminum rotor in terms of efficiency improvement & loss reduction capabilities
Design of 12V DC to 240V AC inverter for induction motor application
No full textAccess is limited to UniMAP community.An inverter is an electrical device that converts Direct Current (DC) to Alternating Current (AC). The converted AC can be at any required voltage and frequency with the use of appropriate transformers, switching, and control circuits. In this project, it is an electronic circuit which converts battery voltage into mains voltage, 12 V DC from the battery converted to 240 V AC and will connect to induction motor. Inverters are commonly used to supply AC power from DC sources such as solar panels or batteries. Power inverters, regardless of size, are typically constructed of a DC-AC converter. A square wave output will be obtained through the use of a microcontroller and high frequency switching. The microcontroller will be used to digitally drive the transistors on the inverter side of the circuit. This will result in pulses at precise time intervals. The slope and magnitude of the output signal will be exact, as opposed to the unstable signal generated by other power inverters that use analog technology. This power inverter will operate using high frequency switching technology. The harmonics that are produced using high frequency switching will include those near the range of the switching frequency, and those that are of a relatively higher order than the 50 Hz frequency. Future work could be done to further improve efficiency, total harmonic distortion, and size of the power inverter. With these additional improvements, the standard DC/AC power supplies could be raised for induction motor application
Enrolment decission of postgraduate students:motivational and institutional aspects / Azizah Daut, Noor Hanim Rahmat & Normah Ismail
No full textAccording to Malaysia Education Blueprint 2013-2015, the nation's success depends on the knowledge, skills and competencies of its human capital. The more people there are in the country with higher education, the higher productivity can be expected. Among the 11 shifts in the education transformation is to have high performing leaders in the country. As such, the government encourages lifelong education among its people and this means more people are encouraged to enroll in postgraduate studies. The objective of this research is to find out the extent of the influence of the factors on the students decision to enroll in postgraduate programs of higher learning public institutions. Specifically, this research will look at the influence of students' motivational factors and institutional characteristics on enrolment decision. In addition to that, this research will also investigate the relationship among socio-demographic factors, motivational factors, and perceived institutional characteristics. This descriptive research attempts to unravel the factors that influence adult learners to pursue post graduate studies. The data will be analyzed quantitatively to enable the researcher to describe the relationship of the factors. Findings of this research will have implications towards understanding postgraduate students' intrinsic and extrinsic motivation decision to enroll in their studies
Effect of stack of transformer core lamination on losses and flux distribution in 3-phase distribution transformers 1000kVa
No full textThis paper describes the results of an investigation on the effect of different amount of layers per stack of core lamination in the three of 3-phase distribution transformers 1000kVA. The investigation involves the variation of power loss, building factor, total harmonic distortion of flux and flux leakages. The power loss and flux distribution have been measured using no load test in three types of model of setting of core built from the same size and type of M5 (CRGO) laminations. The power loss of the transformer core assembled with 1 layer per stack of lamination is 6.58% better than the power loss of the transformer core assembled with 2 layers per stack of lamination and is also 8.31% better than the power loss of the transformer core assembled with 3 layers per stack of lamination, at 1.5T, 50Hz. The flux leakage at the corner joint in the core assembled with 1 layer per stack of lamination is the lowest among the three of the transformer cores, over the whole flux density range. Total harmonic distortion flux is the largest in the transformer core with 3 layers per stack of lamination and the smallest in the transformer core with 2 layers per stack of lamination. Using 1 layer per stack of lamination in transformer core is more efficient than using the other two the three lamination of the transformer core
Design of 12 VDC to 240 VAC inverter for running fluorescent lamp
No full textAccess is limited to UniMAP community.This report entitled “Design of 12 VDC to 240 VAC Inverter for running
fluorescent lamp” summarizes apart of final year project for the Electrical System
Engineering courses done in University Malaysia Perlis. Inverters are used for Direct
Current (DC) voltage to Alternating Current (AC) voltage conversion. Inverters are
commonly used to supply AC power from DC sources such as solar panels or batteries.
The inverter is the heart of a solar system. This is a good choice for people who want to
reduce their electricity bills. The converted AC is from 12 VDC of batteries or power
supply and 50 Hz frequency with the use of center tap transformers. The inverter in
used will produce a square wave output waveform. The fluorescent lamp able to operate
very well uses this inverter design. For a continuously operation of the inverter circuit, a
solar panel will be used to recharge the battery
The design of hybrid system for small house appliance
No full textAccess is limited to UniMAP community.In recent year the demand for electricity power increase rapidly. Apart from this, there are still having areas that not fully grid connected electricity especially in the rural area. Throughout this matter, certain area had use photovoltaic as electricity source. In Malaysia, not only potential solar energy but also wind energy. The combination of these two sources can produce alternative electrical energy. This project is mainly focused on hybrid of wind and solar energy. The objective of this project is to design a hybrid system for small house appliance usage and develop the battery charger. Since these two sources are not constant, battery is needed as a backup source. Charging and discharging rate of battery is importance to ensure the life time of the battery. At the end of this project a battery charger for hybrid source is successful design. By using this charger controller the efficiency of the system will be increase about 40 % compare to if only use solar battery charge
Investigation the effect of flux density on three phase 100KVA transformer core using M4 3% silicon iron material
No full textAccess is limited to UniMAP community.The efficient operation of power transformer cores depends to a large extent on the design of the joints between their limbs and yokes. Transformer are widely used in many sector such as industrial sector and commercial building. Modern transformer design typically exceed 95% efficiency. The function of transformer is act as a passive device which transforms voltage from one level to another, usually from a higher voltage to lower voltage by applying the principle of magnetic induction between coils to convert voltage current levels. Transformer normally consists of a ferromagnetic core and two or more coils called “windings”. A changing current in the primary winding creates an alternating magnetic field in the core. In turn, the core multiplies this field and couples the most of the flux through the secondary coils. Unfortunate when transformers transfer power, they do so with a minimum of loss which is combination of the power dissipated by the core’s magnetizing inductance (Iron loss) and the winding’s impedance (Copper loss). Therefore the conclusion for this project is to investigation the effect of flux density on three phase 100KVA transformer core using M4 3% silicon iron material assembled with 60º T-joint and mitred lap corner joint with stagger yoke. The measurement involves the variation of flux at corner joint and T-joint. The flux density distribution have been measured using no load test by arrays of search coil in M4 (CGRO) grade material of transformer core laminations. This project describes the result from research at corner joint and T-joint using different experiment, normal test and in-plane test
"Sons of White Fathers": Mulatto Vengeance and the Haitian Revolution in Victor Séjour's "The Mulatto"
No full textMarlene L. Daut, "'Sons of White Fathers': Mulatto Vengeance and the Haitian Revolution in Victor Séjour's 'The Mulatto'"(pp. 1–37)
Although many literary critics have traced the genealogy of the tragic mulatto/a to nineteenth-century U.S. letters, in this essay I argue that the theme of tragedy and the mixed-race character predates the mid-nineteenth-century work of Lydia Maria Child and William Wells Brown and cannot be considered a solely U.S. American concept. The image can also be traced to early-nineteenth-century French colonial literature, where the trope surfaced in conjunction with the image of the Haitian Revolution as a bloody race war. Through a reading of the Louisiana-born Victor Séjour's representation of the Haitian Revolution, "Le Mulâtre" or "The Mulatto," originally composed in French and first published in Paris in 1837, this essay considers the implications of the conflation of the literary history of the tragic mulatto/a with the literary history of the Haitian Revolution in one of the first short stories written by an American author of African descent.</jats:p
Design of inverter for high current load application
No full textAccess is limited to UniMAP community.The purpose of this project is to research and design a Direct Current (DC) to Alternating Current (AC) inverter. This inverter is design to create 240 Volt (V) AC with 1000 Watt maximum output. The output of this inverter is for high current application such as refrigerator, water heater and air-conditioning. In theory, this inverter will convert the DC to AC. The current created from this circuit will get its high current and voltage by using the control circuit, power circuit and step-up transformer according to output voltage that needed. This circuit is power and charge from 12 VDC battery that gets its power from wind turbine and solar power. The power from the battery will be send to the inverter circuit to step-up the voltage to 240 VAC with high power and current for any application that need high current to operate
The design of low speed wind turbine
No full textAccess is limited to UniMAP community.This project is to design a low speed wind turbine which it able to produce an electricity to charge 12 V of battery. Wind is a renewable energy which able to generate electrical energy. In this project, Savonius type of Vertical Axis Wind Turbine (VAWT) is mainly focused. Savonius type is choosing because it is most suitable to operate at low speed of wind area. The objectives of this project are to design a suitable wind turbine for low speed; which able to generate electricity and design a direct current, DC converter (DC-DC Booster). The design of Savonius wind turbine is then attached to alternative current, AC rotor. This process is conversion energy from kinetic to electric. The energy produced by the rotor is rectifying to DC before it boosted up to 12 V DC by the DC converter circuit designed. This project has covered from the Savonius turbine design until 12 VDC is produced and able to charge a nominal 12 V battery. The performance of the output voltage using this design had improved and can be commercialize. In market, this design able to compete with existing products on the market.
This is because the design is cheaper and affordable compared with the existing design in the market. This project design has proven its ability to be used as one of the products to generate electricity, based on the results achieved in this project
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