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This paper presents a proper model and methodology to improve the efficiency class of a squirrel-cage induction motor during rewinding. The modeling approach is based on the finite element model, i.e. two-dimensional model coupled with the rotor equivalent circuit (first stage) and the stator equivalent circuit (second stage). Results obtained with finite element analysis are compared with those obtained...
This paper proposes a high-efficiency synchronous reluctance motor drive for the traction system of an electric vehicle. A vector control system, along with a maximum torque per ampere strategy was implemented taking into account the cross-magnetic saturation in the motor, to achieve a high- efficiency drive with a good dynamic behavior. Experimental results obtained in the laboratory, both in steady-state...
Traditional simplified flux linkage method is not suitable for the control of high-speed and super-highspeed SRM drives. In this paper, a high-speed SRM position sensorless control strategy based on an improved simplified flux linkage method to estimate the rotor position is proposed. This method has the capability of timely adjust the phase turn-on/off angle at different speeds and can extend the...
Electronic variable-speed drives (VSDs) can produce large energy and environmental savings in variable-load variable-speed applications when compared with other conventional technologies. There are a very large number of applications (e.g., fluid motion, materials handling, and materials processing) which would benefit, both in terms of process improvement and energy savings, through the use of speed...
The search for sustainable mobility solutions is leading to an intense effort in electric vehicles research and development. In this paper, an electric vehicle drivetrain is studied, with special focus on the inductance variation effect in the electric vehicle bidirectional DC-DC converter performance. The system behavior is studied considering an ideal constant inductor compared with different possibilities...
The use of variable-speed drives (VSDs) is increasing fast. The operation and the output voltage quality of such devices can be significantly affected by power supply voltage sags and continuous unbalance, ultimately influencing the performance of the controlled motor. This paper presents an analysis of the impact of such power supply anomalies on VSDs with 3-phase diode rectifier and PWM voltage-source...
In the last decade, the use of PWM voltage-source inverters to control three-phase squirrel-cage induction motors increased significantly. Consequently, high-frequency current activity in the bearings of inverter-fed motors and/or of devices mechanically coupled to their shaft is presently a common problem, ultimately shortening the bearings lifetime. In fact, bearing failures occurrence in inverter-fed...
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