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This paper presents the modelling and simulation of a low-power Brushless DC machine in a Rotor Flux Oriented mode in MATLAB/Simulink. The modelling of the machine is presented in the synchronous dq frame. Using this model suitable Proportional Integral controllers have been designed for the Rotor Flux Oriented speed and current loops. Sensorless simulation estimates obtained from a back-emf observer...
In industry, the bulk of the stepping motors is driven in open loop full-step mode with maximum current to avoid step loss. This results in noisy operation due to torque ripples and a poor energy-efficiency. To tackle these problems the current current level at which the stepping motor is driven can be reduced to an optimal level. In this paper, a sensorless load angle controller is proposed and implemented...
The detection of bearing damage using the stator current analysis is an important issue in condition monitoring. The modeling of a bearing damage can help to generate data for different loads and faults. These simulation data can be used to develop fault detection and classification algorithms. The aim of this work is to develop a model for the bearing damage effects, which enables the simulation...
The paper discusses advanced control of a dynamometer performing dynamic emulation of mechanical loads. Assumed is certain class of nonlinear load with backlash. Paper presents and describes the basic control structure, which can be used for validation of speed algorithms and its practical implementation with rapid control prototyping. Validation of experimental results against the simulations has...
This paper presents two types of prototype motors for line-starting permanent magnet motors; one is a non-salient- pole machine, and the other is a salient-pole machine. Through both the analyses and the experiments, it is proved that the reluctance torque utility boosts up not only the steady-state characteristics but also the line-starting capability. It is also noteworthy that in the steady-state...
This paper introduces an enhanced permanent magnet motor, that has been optimized for small passenger cars propulsion. The proposed motor configuration utilizes efficiently the energy stored in the permanent magnets and provides optimal power density under specific size constrains and traditional material technology. Finite element modeling enables to determine the detailed motor configuration, through...
This paper describes a new identification approach for a synchronous electromechanical drive. The electrical and the mechanical parts of the drive are identified. The identification is done when the system is in closed loop and in real operating conditions. Thus the approach can be used to perform monitoring and diagnosis actions. The originality of the approach is in the use of the a priori known...
The diagnosis of mechanical anomalies in railway traction system (RTS) have significant importance on traction system safety and reliability, which can avoid train derailment. This paper deals with torsional vibration assessment in mechanical transmission of RTS by a non-invasive technique. The previous studies on an elementary gearbox-based electromechanical system have shown that the influence of...
Flat rolled steel strip is reduced to its final thickness in a tandem cold mill. This mill consists of a series of close coupled rolling stands. In order to maximize strip quality it is necessary to have precise and quick response mill drives. During a modernization study of an existing mill it was discovered that the mill had a low torsional resonance that would be excited by improved, fast drives...
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