This paper is a study of the eddy current brake designed to replace the air brake of railway application. The eddy current brake has the advantage of being able to take a high current density compared to the other application because this brake is used for applying brakes to the rolling stock for a shorter amount of time. Also, this braking system has the merit of being able to take a high current density at low speed rather than at high speed, because the heat generated by the low speed operation is less than that of the high speed operation. This paper also presents a method of improving the output torque of the eddy current brake at low speed operation through a change of the winding as well as the basic design.
In this paper, authors are proposed drive system for BLDCM using motor drivers based on LabVIEW. Most researchers generally use MATLAB/SIMULINK program as computer simulation tool for their control system design. These control system must be coded to the motor drivers using program language such as C for its verification. We developed drive system using LabVIEW, it is able to complete whole process from control system design to verification of control system without program coding. Authors also proposed power conversion stack designed for LabVIEW controller and BLDCM drive.motor drive system. All these features provide convenience to researchers who develop motor control system.In this paper, authors were developed and performed the spherical motor drive system using Labview on PXI platform considered real time programming in coil current control. The results showed that proposed drive system had good performance in the control of spherical motor. Fig. 1. Structure of the spherical motor II. SPHERICAL MOTOR AND ITS DRIVING PRINCIPLES
-This paper suggests the new PMSM design that can reduce leakage magnetic flux.Through adapting non-magnetic frame structure, it decreases leakage magnetic flux on the rotor's rib and web structure. And with this, it increases power density of the motor. To verify the effectiveness of the new design of rotor compared to the common type, through small sized real model's test was conducted. To obtain final model, structural FEM analysis was also used for structural stability. Additional loss generation problem that can occur in the new frame structure was checked with the 3D FEM analysis.
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