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This paper presents analytically derived optimal 3rd harmonic into phase current waveforms to improve the output torque of five phase surface-mounted PM (SPM) machines with the constraints of peak and rms values. The output torque with the 3rd harmonic current is analytically established and the optimal value of 3rd harmonic injected into the current waveform for maximum torque improvement is analytically...
ITER correction coil (CC) cases have characteristics of small section, large dimensions, and complex structure. The case welding deformation should be controlled within 2 mm, and the case weld is required to meet the ISO 5817 class B. In order to achieve the requirements of weld, laser welding with hot wire was chosen for the closure welding of the CC case. The biggest advantage of the welding...
This paper investigates the torque characteristics of an 18-slot/10-pole fractional-slot surface-mounted permanent-magnet (SPM) machine and presents its comparison with conventional 9-slot/10-pole and 12-slot/10-pole SPM machines by analytical and two-dimensional (2-D) finite element analysis (FEA). The winding factors of the 18-slot/10-pole machine are firstly analyzed, and then, its back-EMF, average...
This article uses the finite element method to analysis and calculates the electric field intensity of 500kV power transformer's HV winding. Through analysis and research the power transformer, the article has simplified the model of power transformer. Using ANSYS software establishes 2-D modeling of 500kV power transformer to analysis and conducted on the model mesh. Through analysis and understanding...
This paper introduces the use of a three-phase matrix converter as an alternative to the DC-link back-to-back converter, for doubly-fed induction generator used in wind turbine system. A new dynamic model of matrix converter is proposed together with d-q dynamic representation of doubly fed induction generator. Consequently, the complicated three-phase coupling system is transformed into two independent...
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