LabView Based AC Magnetization Characteristics and Measurement for Soft Magnetic Materials

This paper presents LabView based method combined with a simple analog circuitry to characterize the ac magnetization profile of soft magnetic materials. First, soft magnetic materials prepared as ring cores are wound with equal number of turns for the primary and secondary windings. The primary winding is excited with sinusoidal supply of varying voltage amplitude. The secondary winding is interfaced with the LabView for data acquisition and calculation. Graphical plotting and viewing of the hysteresis loop exhibited by the soft magnetic materials under test can be achieved using National Instrument NI6009 data acquisition card and LabView software. This research discusses the methods of measurement for flux density, magnetic field intensity and core permeability at different points of the ac magnetization. The measured results are then compared with those given by the manufacturer datasheets. Good agreement has been achieved to validate the proposed LabView based method

Performance enhancement of underwater propulsion motor using differential evolution optimization

1113-1119This paper describes the performance enhancement of underwater propulsion motor using differential evolution optimization (DEO). Usually during development stage, an analytical subdomain model (ASM) is often preferred to be used in the design of electric machines since ASM has faster computational time compared to the finite element method. differential evolution algorithm is deployed to provide the optimization process in searching the optimal motor parameters iteratively and intelligently with specific objective functions. For this purpose, a three-phase, 6-slot/4-pole permanent magnet synchronous motor (PMSM) intended for the underwater propulsion system is first designed by using ASM and then later optimized by differential evolution algorithm. Five main motor parameters, i.e., magnet pole arc, magnet thickness, air gap length, slot opening, and stator inner radius are varied and optimized to achieve the design objective functions, i.e., high motor efficiency, high output torque, low total harmonic distortion (THDv) in back-emf, and low cogging torque. Results from differential evolution optimization show an improved performance of the proposed PMSM where the efficiency of the motor is increased to 96.1% from its initial value of 94.2%, 13% increase in the output torque, and 4.1% reduction for total harmonic distortion in its back-emf. Therefore, DEO can be highly considered during initial design stage to optimize the motor parameters in developing a good underwater propulsion motor

An improved non-dominated sorting genetic algorithm III with grey relational analysis decision making for DG placement and sizing

In this paper, an improved Non-dominated Sorting Genetic Algorithm III (NSGA III) is proposed in determining the location and sizing of multi-DGs. NSGA III is the new variant of pareto-based evolutionary algorithm by using reference point approach. Grey Relational Analysis (GRA) is used to determine the best compromise among the non-dominated pareto solutions. Considering that minimization of power losses and improvement of voltage profile as the objectives, the proposed method is applied to IEEE 14 bus system. The obtained results are comprehensively compared with other published works. From this comparative analysis, it is proved that the proposed algorithm is very effective in reducing the line losses and improving the voltage profile

Investigation of Electromagnetic Force in 3P5W Busbar System under Peak Short-circuit Current

Electromagnetic forces on three-phase five-wire (3P5W) busbar system is investigated under three-phase short-circuits current. The conductor busbar placed in compact galvanized steel enclosure is in the rectangular shape. Transient analysis from Opera-2D is carried out to develop the model of three-phase short-circuits current in the system. The result of the simulation is compared with the calculation result, which is obtained by applying the theories of Biot Savart's law and Laplace equation. Under this analytical approach, the moment of peak short-circuit current is taken into account. The effect upon geometrical arrangement of the conductor and the present of the steel enclosure are considered by the theory of image. The result depict that the electromagnetic force due to the transient short-circuit from simulation is agreed with the calculation

Commutation Time Estimator For PM BLDC Motor Torque Signature Enhancement

This paper presents the development of the commutation time estimator (CTE) for PM BLDC motor drives. The proposed scheme is aimed to enhance motor output torque by minimizing the generated torque ripples. The torque ripples originating from commutation instances cause spikes and dips in the motor output torque. The motor output torque could be enhanced by mitigating the phase current mismatch rate during phase current commutation period. This rate could be almost matched by introducing the commutation time estimator (CTE) in order to control the rate of the energized phase current to be matched with the de-energized phase rate. Results obtained have validated and verified the proposed CTE effectiveness with a 50% average reduction of the generated torque ripples in PM BLDC motor

Mechanical Assemblies Design Of Underwater Electric Motor.

Electric motor plays an important role in providing Autonomous Underwater Vehicle (AUV) system the capability for motion

Penghayatan agama (religiosity) dan praktis keusahawanan: analisis implikasi dalam pembangunan usahawan Melayu

Sejarah telah membuktikan bahawa keberkesanan perlaksanaan sesebuah sistem ekonomi mempunyai hubungkait yang rapat dengan sentimen dan aspirasi masyarakat yang terbabit. Keghairahan dan ketinggian motivasi sesebuah masyarakat dalam bidang ekonomi sangat ditentukan oleh pola berfikir, kepercayaan, budaya dan sistem nilai yang terangkum dalam pandangan semesta (worldview) sesebuah masyarakat. Agama mendominasi pandangan semesta melalui pelbagai sifat (atribusi) kerohanian serta berkeupayaan mempengaruhi tingkahlaku dan orientasi sesuatu masyarakat kerana ia merupakan suatu cita-cita yang ingin dicapai oleh setiap individu. Dalam artikel ini, pola perkaitan antara penghayatan agama (religiosity) dengan pembangunan usahawan Melayu dibuktikan melalui kajian terhadap pelbagai bentuk penulisan dan kajian yang telah dilakukan sebelum ini. Hasil kajian mendapati, kejayaan dan kegemilangan yang dihasilkan dalam Tamadun Melayu sebelum ini bukanlah berlaku secara kebetulan, sebaliknya ia juga turut dipengaruhi oleh agama Islam yang menjadi asas unggul dalam memperkukuhkan hubungan tersebut. Agama adalah jati diri bagi seluruh umat Islam sama ada seseorang itu ikhlas atau tidak dalam beragama serta dalam suasana majoriti atau minoriti. Kecemerlangan dan keunggulan sesuatu bangsa hanya mungkin tercapai menerusi penghayatan nilai-nilai agama dan budaya sendiri. Manakala komitmen dalam keagamaan adalah bukti dan pernyataan identiti seseorang Musli

High voltage magnetic pulse generation using capacitor discharge technique

A high voltage magnetic pulse is designed by applying an electrical pulse to the coil. Capacitor banks are developed to generate the pulse current. Switching circuit consisting of Double Pole Double Throw (DPDT) switches, thyristor, and triggering circuit is developed and tested. The coil current is measured using a Hall-effect current sensor. The magnetic pulse generated is measured and tabulated in a graph. Simulation using Finite Element Method Magnetics (FEMM) is done to compare the results obtained between experiment and simulation. Results show that increasing the capacitance of the capacitor bank will increase the output voltage. This technology can be applied to areas such as medical equipment, measurement instrument, and military equipment

A Semi-Automatic Approach for Thermographic Inspection of Electrical Installations Within Buildings

Maintaining the reliability of electrical installation has become part of the energy efficiency practices in building. The degradation of electrical installations can cause overheating, which can lead to subsequent failure of the equipments that can potentially result in unplanned power outages, possible injury and fire hazard. In addition, the efficiency of an electrical system becomes low prior to failure, thus energy is spent generating heat and causing unnecessary energy loses. Therefore, early prevention is required to avoid this situation by monitoring the reliability of the electrical installations through energy audit practices. This article proposes a semi-automatic approach for evaluating the thermal condition of electrical installations within the building in Malaysia by analyzing its infrared image. Initially the interest regions of the images are manually segmented. Then the statistical features of first order histogram and gray level co-occurrence matrix features as well as the differences of feature parameters between hot and reference regions are extracted from segmented regions. Principle component analysis is applied for the best features selection and at the final stage, the condition of electrical equipments will be classified using multilayered perceptron neural network. The performances of multilayered perceptron networks have been compared and tested with various training algorithms. The classification accuracy of multilayered perceptron networks are also compared with discriminant analysis classifier and it is found that the multilayered perceptron network using Levenberg–Marquardt algorithm gives the best testing performance. The result shows that the maximum testing accuracy 78.5% was obtained