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For precision machining of a complex shaped object, Non-uniform rational B-spline (NURBS) interpolator is often preferred over conventional linear and circular interpolator. However, the use of NURBS interpolators has been limited due to heavy required computational load and feedrate fluctuation. This study focuses on the suppression of the feedrate fluctuation as it would degrade the quality of the...
There are many software can be carried out simulation of photovoltaic (PV) system such as PSIM and Matlab. Those software have their own advantages in the simulation of PV system. This paper proposed a joint-simulation of a stand-alone PV system based on PSIM and Matlab to achieve the maximum power point tracking (MPPT) of PV cells and the stability of PV system. In this paper, the main circuit is...
This, paper proposes a dual-stator high temperature superconductor (HTS) reluctance-rotor brushless doubly-fed wind generator, which owns two stators and one salient reluctance rotor sandwiched between two stators. Two sets of windings with different pole-pairs locate on the two stators, separately, named as control winding and power winding. The modulation of reluctance rotor makes two sets of windings...
A silicon carbide (SiC) vertical field effect transistor (VJFET) with ultra-low feedback capacitance Crss has been developed, which is called as screen grid VJFET (SG-VJFET). The SG-VJFET is a very promising power device because of the superior static characteristics such as normally off, low on-resistance, and high breakdown voltage, furthermore, issueless in terms of gate oxide reliability and long-term...
Due to the changed parameters of double sided linear induction motor (DSLIM), the field oriented control (FOC) is not suitable in control and it will result in thrust fluctuation. The thrust control in the DSLIM is a better solution to suppress the thrust fluctuation. This paper establishes the dynamic model of DSLIMs according to the change principle of parameters and uses the model predictive thrust...
Contactless transformer is the key part of the inductive contactless power transfer (ICPT) system. In this paper, a high coupling coefficient contactless transformer is proposed with asymmetric trapezoidal shape cores. With 3D finite element methods (FEM), this paper calculated coupling coefficients of the transformer in different inner lateral side distances and bending angles of the magnetic core...
Output voltage of renewable energy resources, such as fuel and solar cells, varies widely with load and environmental condition, so a DC-DC converter should be suitable for wide input-voltage range application and be with low input ripple current. An integrated boost three-phase half-bridge converter is proposed. The boost and three-phase half-bridge converters are integrated to reduce number of switches...
This paper focuses on the measurement of magnetic properties of soft magnetic composite(SMC) materials at high frequencies and high flux densities. Since SMC materials are very promising in the design of high-frequency and high power density motor, the losses at a very high frequency are needed to be measured and then the calculation of the performance of the machine will be accurate. In this study,...
Industry applications in fields of electrical engineering have a high demandfor engineers with knowledge and experience in using digital signal processor(DSP). Many universities offer this type of training in DSP and motor control courses. However, in traditional teaching of motor control with DSP platform, it is difficult for the undergraduate students of electrical engineering to program the motor...
In this paper, a novel stator structure with axially tapered stator tooth tip is proposed to mitigate cogging torque and reduce the machine back EMF harmonics. Furthermore, the stator tooth tips are specifically designed to provide balanced axial electromagnetic force. In order to realize continuous variation of stator tooth tip widths, the soft magnetic composite (SMC) material is used for the stator...
Optocouplers comprising an optical sensor and electrical readout circuits are commonly fabricated on a single chip to reduce the size of electrical systems and enlarge circuit board capacity. Nonetheless, the inclusion of two separate components on a single chip still results in high cost and area overhead exceeding those of monolithic chips. In this paper, we propose an optocoupler integrating an...
Electrical and mechanical faults in a three phase Induction machine is modelled and analysed, to identify potential fault signatures. Electrical, magnetic and torque signatures are analysed for various faults and their combinations, for potential fault signature identification. A multi-physics Finite Element tool is chosen for this analysis considering the possibilities to extend the study to thermal...
The efficiency of motor can be increased by optimizing stator, rotor slot design and using more materials, but there is limit within the narrow space of motor frame. Because of limited dimension, high quality material can be adapted, such as copper bar instead of aluminum bar, or low core loss Si-steel. However, adapting low core loss electrical steel does not always mean reduction of core loss. Because...
In the inner evaporative cooling turbo-generator, the cooling medium flows in the hollow conductor of stator and the cooling system depends on the sensible heat and latent heat of cooling medium to achieve the cooling goal of generator. Due to each cooling medium has unique thermal properties, the flow characteristics of different cooling medium in the hollow conductors is disaffinity. In this paper,...
Single-phase capacitor induction motors are the most common low cost solutions for household appliance. An alternative high efficiency motor is the novel three-winding series-connected single-phase motor. This paper proposes the simulation and analysis of the fractional order model of the novel motor with full load and no load. A transfer function with a fractional derivative order has been selected...
In this paper, a set of remote monitoring system is designed for the experimental platform of million kilowatt-class stator bars and bus bar whole evaporative cooling cycle model. The system data acquisition is based on the PXI architecture, the monitoring platform is based on LabVIEW, and the system has real-time signal acquisition, analysis and storage of pressure, temperature, flow and other signals...
Today, a lot of accumulator trains are introduced for saving the global environments. In the East Japan railway, a new battery powered railway vehicle called ACCUM on the non-electrified Oga line has been operated on March 4. ACCUM is provided AC-20kV energy from Oga substation. This substation has to possess earth fault protection system not to effect railway peripheral facilities and customers....
Nowadays, rotating machines are widely used in most industries. Because of that, magnetic properties of soft magnetic material are actively studied under 1-D and 2-D magnetic flux excitations in order to estimate the total core loss produced by the material during the magnetization. SOMALOY 700 material, a soft magnetic composite material, is considered in this paper. 2-D magnetic measurement has...
This paper addresses trade-off with starting capability to maximize efficiency of a small single-phase line-start permanent magnet motor. In general, as the number of main winding turns is higher, the induced electromotive force is higher. As a result, as the input current is reduced, the copper loss of the stator windings (main and auxiliary windings) is lower. Therefore, the motor efficiency is...
In 2016, the licensee found that load sequence logics for the emergency diesel generator (EDG) of some Nuclear Power Plants (NPPs) in Korea were errors that can operate two component cooling water pumps (CCWP) in a train. The rated power of the EDG is designed with consideration for one CCWP. An increase of the load due to operation of two CCWPs can exceed the rated power of the EDG and cause a serious...
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