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In this paper, detailed steps and procedures for the design of a fractional slot non-overlapping(concentrated) winding(FSCW) permanent magnet synchronous generator(PMSG) is presented. Here the design of a 2 kVA, 1000 rpm, 230 V machine is done. Analytical calculation steps have been shown. starting with conventional design methods, main dimensions are chosen. Thereafter modern methods of determining pole-slot combination, number of turns per phase, the geometry of the stator and the magnet dimensions are adopted. Thereafter the design has been validated and fine-tuned using standard FEM-based commercially available software package. The parameters of the machine have also been evaluated. Finally, the machine has been fabricated by a local manufacturer and then tested at the lab. The preliminary test results are found to be in good agreement with theoretical predictions which upholds both the design accuracy and precision of fabrication.

This paper presents detailed steps of parameter estimation and performance analysis of two interior permanent magnet(IPM) motors that have been designed in the laboratory and are in the winding stage at the works of a small local machines manufacturer. The parameters have been estimated using standard FEM packages and through analytical calculations under different operating conditions. The estimated parameters are used to evaluate the performance (such as torque, speed, efficiency) of the IPM motor. The effect of saliency on the motor performance has been highlighted. The effect of parameter variations on the performance of the machine has also been presented. The field weakening capability of the IPM motor has been studied too. The analytical and FEM-based results are presented for two laboratory designed IPM motor prototypes (5kW, 8 pole, 750rpm and 0.75hp, 4 pole, 1500rpm IPM motors).

This paper presents steps and procedures of designing a closed loop speed controller for a surface mounted permanent magnet(SM-PM) brush-less DC machine(BLDC). The closed-loop speed control technique has been implemented using Hall-effect position sensor. The BLDC motor control algorithm has been modelled and simulated first. The same has been thereafter practically implemented on a 0.75 hp, 1500 r.p.m BLDC motor that was designed and developed as a lab prototype. Both the simulation and the experimental results are in excellent in agreements.

Microstrip patch antenna has extensive applications in areas requiring light weight and low profile antenna sub system. Differential Evolution (DE) algorithm and Cuckoo Search (CS) algorithm are modern optimization algorithms used here for determining the design parameters of microstrip antenna. In literature, there does not exist any direct relation between the bandwidth of a microstrip patch antenna with its design parameters. In this paper, a relationship between bandwidth and geometrical parameters of co-ax fed microstrip patch antenna has been established using Curve fitting model. The investigation is performed for microwave frequencies over a certain range. A comparative study is performed between the results obtained for bandwidth enhancement by optimizing the patch length, patch width and the position of feed using DE and CS algorithms.

Microstrip line feed Microstrip Antenna (MSA) geometrical design parameters are Patch Width, Inset Feed Position and Patch length. Cuckoo Search algorithm (CS) is a recent optimization algorithm creating its application in the electromagnetic community for evolving the design parameters of microstrip antenna. Cuckoo Search algorithm (CS) has been employed in this paper to calculate the design parameters of the microstrip line feed microstrip antenna for a reaspective target frequencies and return loss. Same investigation is made for different microwave frequencies (1–18 GHz) and at dielectric constant 2.4. Simulations have been done using IE3D software. The results suggests Cuckoo search algorithm outperforms Differential Evolution (DE)in terms of quality of solution and convergence speed.

Microstrip Antenna (MSA) found widespread applications in satellite communications, wireless and microwave systems, direct broadcast systems; due to their reduced cost and compact-planar structure. Differential Evolution (DE) algorithm is a recent evolutionary computing technique. In this paper, we have implemented DE algorithm to optimize the resonant frequencies of the inset line fed rectangular microstrip patch antenna considering their geometrical design parameters like patch length, patch width and the length of the inset fed as an unknown variables. Simulations have been done for different microwave frequencies (3 to 18 GHz) for the optimized antennas.

This paper presents detailed steps and procedure for the design of a permanent magnet brush-less DC machine(PM-BLDC). Here the design(both the armature circuit and the PM field) is done for a 4-pole 0.75 hp, 1500 rpm surface mounted BLDC(SPM-BLDC). First the design and the performance analysis of the machine has been done by hand calculation. The results are then fine tuned and verified using a standard finite element analysis(FEM) software. Parameters of the machine have also been calculated. The designed BLDC motor also have been fabricated.

High switching frequency in power electronic converters reduces the size and weight of passive elements used in the converter but increases the switching losses of the power electronic devices. Remedy for high switching losses is the use of soft switching techniques which reduce switching losses and inturn increases efficiency. Zero voltage switching (ZVS) is one type of soft switching technique. In this paper a ZVS strategy based buck converter is presented operated at 50kHz. Performance analysis and simulation of the converter has been done by using SequelGUI2 software. Finally, a small laboratory phototype of rating 50W, 50kHz has been designed, fabricated and tested. The experimental results and simulated performance are found to be in good agreement.

Coaxial probe fed rectangular microstrip antenna is a popular type of patch antenna having applications in communication and radar systems. Particle Swarm Optimization (PSO) is a popular optimization algorithm and recently it is being used for design optimization of microstrip patch antennas. In this paper PSO has been used for optimization of resonant frequency of coaxial probe fed rectangular microstrip antenna. Investigation is made at different microwave frequencies and ranging between 3 GHz and 18 GHz. The optimization problem has three variables namely, patch length, patch width and position of the feed. Results encourage the use of PSO for optimal design.

Aperture coupled microstrip antenna is gathering a lot of interest in communication and radar systems. Particle swarm optimization (PSO) has been introduced to the electromagnetic community recently for design optimization of microstrip patch antenna .In this paper PSO has been used for accurate determination of resonant frequency of rectangular aperture-coupled microstrip antenna. The investigation is made at different microwave frequency ranges and it extends up to Ku band. The procedure is repeated for different dielectric constant of antenna and feed substrate. The optimization problem has three variables namely, aperture length, aperture width and stub length respectively. Accuracy of the results encourages the use of PSO.