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Conventional methods for storing and reproducing task are based on only the information of the actuators in the robot. However, in these methods, reproducing the stored task is difficult when the environment differs from that in storing phase. This is because these methods consider a meaningful task as just a motion. In this paper, to reproduce a stored task even if the environment differs from that...
Fractional-slot windings is widely used in synchronous machine due to give us more flexibility on selection of the number of slot at design stage. It is also known that fractional-slot windings produces additional harmonics compare to integral-slot windings. These harmonics may cause increasing of stray losses and stator core vibration This paper describes the result of space flux harmonics caused...
This paper presents a new method for estimation of rotor surface losses in small to medium capacity synchronous machines. In this study, the authors have proposed a method for estimating the slot ripple losses induced on the rotor surface. Also, we compared the damper systems using the Finite Element Method (FEM) and verified the results by the measured data.
It is known that space flux harmonics generated by fractional-slot winding are different from ones generated by integral-slot winding. The authors reviewed space flux harmonics caused by fractional-slot winding and developed a new winding method, which is based on intersperse one coil winding, to reduced low order space flux harmonics components. The validation for the new design has been also completed...
This paper presents the influence of reactance saturation in transient and stability phenomena for cylindrical synchronous machine. For this purpose the authors have examined various equivalent circuit models using electromagnetic transients program (EMTP-ATP).
The carbon brushes have been widely used for static field excitation of turbine generators. These are used various conditions (current, environment and peripheral velocity etc.). Thus we have to anticipate the characteristics of carbon brush and slip-ring. The authors report the investigated result of the Ghost Mark of slip ring in this paper, this occurrence of Ghost Mark can be predicted by measuring...
This paper presents a new method for estimation of rotor surface losses in small-to-medium capacity synchronous machines. In this study, the authors have proposed a method for estimating the slot ripple losses induced on the rotor surface. Also, we compared the damper systems using the finite-element method and verified the results by the measured data.
This paper presents the characteristics of equivalent circuit model for large synchronous machine and its implementation by using finite element method (FEM) and electromagnetic transients program (ATP-EMTP). Reactance saturation influence of large turbine generator is also explained in this paper.
The subject of this paper is in association with parallel connected carbon brush current sharing unbalance problem in magnetic field current supply system for turbine generator at thermal or nuclear electric power plant. In case of large DC motors, in which copper commutator is applied, several hundreds of brushes are connected in parallel, where approximately 20% or 30% of current sharing unbalance...
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