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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...
This paper presents a simplified dynamic model of an induction machine with broken rotor cage bars. Starting with the rotor voltage equation in rotor reference frame, equations are transformed into usual field reference frame, after taking into account unequal parameters in both axes, as a consequence of the fault. In the process, several simplifications have been introduced and resistance change...
This article is focused on dependence of a small induction machine electromagnetic losses on load. Joule losses in stator and rotor and core losses are measured and computed by finite elements method in six points with different load. Model for the finite elements method simulations considers impact of manufacturing process such as impact of cutting on properties of sheets or riveting of stator. Results...
In this paper, a fault assessment of a multiphase permanent magnet generator designed for ‘more electric engine’ aeronautic applications is presented. The distribution of various electrical faults occurring in three-phase machines that is available in the literature helped the authors to identify the most probable fault types. The six-phase machine under observation is tested under these faults both...
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...
This paper presents evaluation of simplified dq model of induction machine. Model is particularly useful for simulation of induction machines with broken rotor bars. Investigation is made in how useful and accurate this model is compared to experimental measurements. Comparison of simulation results with experimental data, don for two different machines, show that the model is very accurate and useful...
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...
The paper deals with the evaluation of line-start interior permanent magnet synchronous motor (LSIPMSM) model parameters using finite elements. A lumped parameter dynamic model with current-dependant variable parameters is used in LSIPMSM dynamic performance evaluation. By a dynamic model determined run-up responses under different supply and load conditions were confirmed experimentally in the case...
This paper discusses a reluctance-dependent back electromotive force (EMF) model for encoderless vector driven permanent magnet synchronous machines (PMSM) compared to well known, non reluctance-dependent back EMF models. Established PMSM could have considerable varieties in direct and quadrature inductances. So it makes sense to consider this behaviour in an extended back EMF model. On closer examination...
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