The success of the twostage engine with a pushpull linear alternator encouraged modelling and design of a fourstage engine with two pushpull linear alternators able to generate up to 269 w of electricity, theoretically. Electrical engineering, mathematics, scientific research. The modeling effort documented in this thesis investigates the operation and control of a twostroke, freepistonengine driven linearalternator for resistive and batterycharging loads. Theses, dissertations, and student research from electrical. Riley, paul howard 2014 designing a lowcost electricity. Linear permanent magnet generators i wave energy and tidal power have always been an area of interest in many nations since there is an immense potential in these energy sources but the problem of energy conversion has always been a daunting issue. An idealized numerical model based on an air standard otto cycle operation has also been presented 11. Development of a low inductance linear alternator for. Linear motors and alternators with reciprocating mover are theoretically known for a long time, but in last 1015 years one can find several new practical applications of such machines, which are. The ieee type 1 excitation system representation, linked with a simplified alternator and voltage regulator equivalent, provide a closedloop model for digital simulation. The first prototype was a small size, singlestage generator powered by combustion from a propane gas burner.
By coupling, we can eliminate the use of gearboxes and power take off schemes. Currently, a linear alternator and engine system project is being conducted at. This paper present our experience in the design of a permanent magnet generator. In this thesis, a methodology to accurately estimate the state of charge soc of the batteries used in hybrid electric vehicles hev is proposed.
Mechanical power engineering, 2010 faculty of engineering, cairo university a thesis submitted in partial fulfillment of the requirements for the degree of. Design optimization of a linear generator with dual. Principle of linear alternator figure 2 is a cross section view of a singleslot singlephase cylindrical permanent magnet linear alternator. This thesis applies a novel type of linear alternators that has the magnets on. The control strategy is aimed to generate and deliver power to the interconnected system economically and reliably while managing the voltage and field current within set limitations. A linear relationship exists between open circuit voltage v ocandsoc. Piston engine linear electric generator must work at frequencies of 2530 hz. The control strategy is aimed to generate and deliver power to the interconnected system economically and reliably while managing the. Renewable urban energy systems at the university of stellenbosch, stellenbosch, republic of south africa. The prototypes used air at atmospheric pressure as working gas, an audio loudspeaker as linear alternator, while most of acoustic resonator parts were made of pvc components.
In addition, larger alternator sizes can provide a costeffective use of engine power in acrosstheline motorstarting applications and can be used to minimize voltage waveform distortion caused by non linear loads. The simplest type of linear alternator is the shake flashlight. Development of a hybrid linear actuator baoping wen master of applied science mechanical and industrial engineering university of toronto 2011 abstract this thesis focuses on the development of a novel hybrid linear actuator hla. Linear alternator for use with linear engine dulpichet rerkpreedapong the previous research at west virginia university has developed a permanent magnet linear alternator and linear combustion engine for testing and studying the performance. The atr can be used to test 100w class linear alternators, and is a variable stroke up to mm and variable frequency up to 120 hz linear dynamometer.
Xin niu engineering system design lab university of illinois at urbanachampaign august 25, 20 abstract ocean wave energy conversion is a popular research area due to the increasing scarceness of nonrenewable energy resources. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Supplementary notes the views expressed in this thesis are those of the. A thesis submitted in partial fulfillment of the requirements for the degree of master of science in mechanical engineering. The new model has achieved the same level of performance as shown in right figure with only a half mass of magnets by reducing the magnetic resistances due to air gaps.
Characteristics of linear alternator performance under thermoacousticpowerconversion conditions by ahmed yassin abdelwahed ibrahim a thesis submitted in partial fulfillment of the requirements for the degree of master of science in mechanical engineering under the supervision of. By utilising ndfeb permanent magnets in a halbach array, considerable functional improvements can be made whilst preserving the low cost massproduced manufacturing process. Page i of 35 designing a lowcost electricitygenerating cooking stove for highvolume implementation by paul howard riley thesis submitted for the degree of doctor of philosophy to. Linear electric generator with halbach array to self. Stanley chien for introducing me to my thesis topic and for helping with my obdii speed problem.
Permanent magnet linear alternator magnetic field analysis. Linear alternator performance indices under frequency range 4560 hz, this data is for a gas mixture consists of 60% helium40% argon, a mean gas pressure of 30 bar and dynamic pressure ratio 0. Development and validation of linear alternator models for. A case study in axial flux permanent magnet machine design, jessica l. In the proposed scheme, a system theory approach is employed to identify the open. The new model has achieved the same level of performance as shown in right figure with only a half mass of magnets by reducing the magnetic resistances due to. If this is in some type of simple loop configuration the inductance is a linear function of the total flux and the number of turns. Halbach array linear alternator for thermoacoustic engine. In this research, the manual analysis was used for solving the magnetic field of. Table 415 sample results for low load condition with recirculation. Twostage thermoacoustic electricity generator with push. Field analysis and design of a moving iron linear alternator for use. Twostage thermoacoustic electricity generator with pushpull linear. The freepiston linear generator fplg uses chemical energy from fuel to drive magnets through a stator and converts this linear motion into electric energy.
Optimization of a brushless permanent magnet linear alternator for. Wherever external contribution and other sources were implied, every attempt was made to emphasise this clearly by indicating references to the literature. The novel configuration of the engine consists of two identical halfwavelength. In this prototype, magnets are part of the moving part.
Development of a low inductance linear alternator for stirling power convertors steven m. Sample of the measured inphase current and voltage signals at the linear alternators. Figure 17 opposedpiston freepiston linear alternator with mechanical springs. The principal difference is in how they are used and which direction the energy flows. Operation and control of a twostroke, freepistonengine. Modeling and design analysis of a permanent magnet linear synchronous generator technical report uiucesdl201. Rareearth permanent magnets should be used to obtain high power densities, for a smaller, easier to fit inside the vehicle generating system. The rotor consists of a smooth solid forged steel cylinder, having a number of slots milled out at intervals along the outer periphery and parallel to the shaft for accommodating field. Magnet volume is defined by the cost target but the tradeoffs between output power, operating frequency, coil displacement and efficiency of the thermoacoustically driven linear alternator need to be addressed. Linear motors and alternators with reciprocating mover are theoretically known for a long time, but in last 1015 years one can find several new practical. Liyan qu a linear generator for human motion energy harvesting is designed and optimized in this study. An abstract of the thesis of oregon state university.
Qiang yi for theoretical and technical advise and expertises. Modeling of linear induction machines for analysis and control by armando jose sinisterra a thesis submitted to the faculty of the college of engineering and computer science in partial fulfillment of the requirements for the degree of master of science florida atlantic university boca raton, florida april 2011. Design of an integrated starteralternator for a series hybrid electric vehicle. Understanding the alternator four wires connect the alternator to the rest of the charging system. S is used by the regulator to monitor charging voltage at the battery. A thesis submitted in partial fulfillment of the requirements for the degree of. Because of its versatility, low weight and high efficiency, it can be used in a wide range of applications, although it is of special interest to the mobility industry as range extenders for electric vehicles. Above figure shows the comparison of field analysis between the previous model 2airgaps and the new model 1airgap. A linear alternator is essentially a linear motor used as an electrical generator. Finally, it is stated that this thesis solves the problem of developing a linear engine to the point of feasibility. This helps the linear alternator to be more compact with high efficiency and a fewer moving parts. Linear alternator research thermal energy conversion. It is believed that the linear alternator as the secondary power output has the potential to increase.
Based on these requirements and the experience in designing a foursided pm linear generator 15, a three. The linear alternator can directly extract the energy from the linear engine. Experimental data, dissertation thesis, university of wisconsin, 1968. The output power and cost of the linear alternator is fixed for the score project application and used as a basis for the electrical design.
The modeling effort documented in this thesis investigates the operation and control of a twostroke, freepistonengine driven linear alternator for resistive and batterycharging loads. Lingxi li for your encouragement and positive attitude. Larger alternator sizes have lower temperature rise for longer life of the alternator insulation system. Firstprinciples models of each of the individual components of the system were tied together into a dynamic model of the overall system. Design optimization of a linear generator with dual halbach array for human motion energy harvesting wenjia zhao, m. Colton pdf experimental investigation of dielectric barrier impact on breakdown voltage enhancement of copper wireplane electrode systems, elham foruzan, m. Thermoacoustic devices have two major advantages over conventional technologies. The system in which the lg is integrated is called freepiston linear generator.
Linear alternator analysis and schematics electrical. Linear permanent magnet generators i dc generators, pm. Twostage thermoacoustic electricity generator with pushpull. I, sebastian giglmayr, hereby declare on oath that this masters thesis is a presentation of my original research work and that it has not been submitted anywhere for any award. Design and assembly of a thermoacoustic engine prototype. Motoring the linear alternator 820 gram moving mass 7093 hz resonance frequency displacement linear electrical machine, is introduced. The oscillating linear engine and alternator olea machine is a micro power generator that operates on.
Linear permanent magnet electric generator for free piston. The pushpull coupling offers a solution to run the loopedtube thermoacoustic engine at high acoustic impedance using one alternator. The induction motor is made up of the stator, or stationary windings, and the rotor. The law of inductions demands high speed for the moveable electrical parts, on the contrary mechanical parts like low sliding speeds to avoid excessive wear. In addition, larger alternator sizes can provide a costeffective use of engine power in acrosstheline motorstarting applications and can be used to minimize voltage waveform distortion caused by nonlinear loads. Masters thesis thesis submitted in partial fulfilment of the requirements for the degree of master of science in engineering at the university of applied sciences technikum wien, vienna, austria course of studies. Because of this linear feature it is possible to couple the motion of the rotor to the reciprocating vertical motion of the ocean waves. Linear alternators connections in thermoacoustic power converters. Schifer2 nasa glenn research center, cleveland, ohio, 445 the freepiston stirling power convertor is a promising technology for highefficiency heattoelectricity power conversio n in space. Figure 1 7 opposedpiston freepiston linear alternator with mechanical springs. The authors have designed, constructed and tested a prototype sparkignited linear engine coupled with a linear alternator figure 1.
Lewandowski national aeronautics and space administration glenn research center cleveland, ohio 445 abstract two models of the linear alternator of the advanced stirling convertor asc have been developed. This study focused on using both power extraction devices together, namely turbinecompound freepiston linear alternator tcfpla engine. Design optimization of a linear generator with dual halbach. The linear generator can be used to convert human motion energy to. Single phase automatic voltage regulator design for.
Development of resonating oscillating linear engine alternator. In order to increase the power generation of existing tubular linear generators, we changed the axialdirection permanent magnet array to a halbachtype array. The performance of the alternator being tested is typically mapped at steadystate conditions over a range of temperatures, mover amplitudes, and linear alternator loads. Other supporting documentation to add context, where riley was the main contributor 20 score project plan 21 score ca agreement 22 score intellectual property agreement 23 score external collaborators agreement. Design of power system stabilizer national institute of technology, rourkela certificate this is to certify that the thesis entitled design of power system stabilizer submitted by arya kumar swagat ranjan swain 108ee085, ashit kumar swain 108ee087, abinash mohapatra 108ee090 in the.
Field analysis and design of a moving iron linear alternator. Parametric sensitivities are derived from computations upon the transient exciter field voltage response caused by a perturbation of. B is the alternator output wire that supplies current to the battery. Figure 2 shows the same rotary linear generator from figure 1, but now with a mechanical slanted bearing 16 supporting the slanted magnetic bearing in case the magnetic bearing is not accurate enough on the shaft 6 is a slanted bearing 16 accommodating a nonrotating ring 17 connected via a strong pin 9 to a ball 8 in a stationary embedment 7. An alternator is an array of interacting processes that satisfy three conditions.
Linear alternator performance indices under frequency range 4560 hz, this data is for a gas mixture consists of 60% helium40% argon, a. The research includes the optimal design, the particular fabrication, and the experimental validation. The freepiston linear generator is able to convert chemical energy into electrical energy by using a combustion. It is believed that the linear alternator as the secondary power output has the potential to increase the efficiency when combined with the turbine. Modeling and design analysis of a permanent magnet linear. Li 21 the parameter l is known as the self inductance of loop 1. Development and validation of linear alternator models for the advanced stirling convertor jonathan f. Wonjong kim chair of committee sooyong lee member jo w. This is an electric flashlight which contains a coil and a permanent magnet. A linear alternator that functions like its rotary counterparts is used in this system. First, if a process has an enabled action at some state, then no neighbor of that process has an enabled action at. Induction motor theory jerry bednarczyk, pe course content introduction the ac induction motor is well suited to applications requiring constant speed operation.
A linear alternator is most commonly used to convert reciprocating i. The generator has a long translator and a permanent magnet mover as magnetic field source. Rotary linear generator strokerotor generator by physicist wolfhart willimczik. This thesis has been accepted for inclusion in wvu graduate theses. When the appliance is shaken back and forth, the magnet oscillates through the copper coil and induces an electric current. Designing a lowcost electricitygenerating cooking stove for highvolume implementation by paul howard riley thesis submitted. Therefore, we propose a new tubular permanent magnet linear generator that uses a halbach array, to send a message or emergency call when the battery is discharged.
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