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This paper deals with the study of fractional slot permanent magnet synchronous machine, under 9 slots/10 poles structure, with outer rotor. It reports some results obtained by means of FEM-based simulation, which have as main goal the improvement of output characteristics. More specific, the inner diameter of the rotor and the stator shoe shape are modified. The analysis takes into consideration...
The paper presents a new solution of the stator winding of three-phase induction motor that brings an increase of the performance by modifying the air-gap flux density wave towards a more sinusoidal shape. The concept involves different number of turns in stator slots accompanied by a modification of the magnetic circuit. Both FEM-based analysis and experimental results put in view significant improvements.
This paper presents the study of the transients for a multi-speed induction motor with toroidal stator winding and external rotor. The results prove the superiority of the toroidal winding for external rotor structures since it offers an easier way to change the coil ends connection in order to obtained more synchronous speeds. By knowing the motor mechanical characteristics, the start-up has been...
This paper presents a study upon a new configuration of an outer rotor induction motor with multipole stator winding. The new design comes out as a result of a reconfiguration process of a real model by means of FEM-based analysis. The main transformation consists in replacement of the regular drum winding with a toroidal one, which allows a high flexibility in changing the number of pole pairs. The...
Currently the renewable energy presents an increasing interest and special attention is given to the small scale wind turbines, used to generate electricity for domestic needs. Their purpose is to produce electric energy at increasingly smaller speeds of the wind and with improved economically efficiency. This paper presents the design and study of the behavior for a direct drive permanent magnet...
The gearless PM generator system has high potential for the wind turbines because of its robustness, increased energy yield and reliability compared to electrically excited ones. The main disadvantage of PM synchronous generators is the high cost of PMs and the demagnetization risk at high temperature. In this paper is presented a comparative analysis in terms of permanent magnet type chosen for the...
This paper presents a dual approach concerning the influence of unbalanced supply voltage on the three-phase induction motor operation. On one hand, a FEM-based analysis examines the ill effects upon the magnetic field, as main concern, and a few electric and mechanical parameters. On the other hand, a study of the transitory regime (including no-load startup and sudden loading) is employed under...
The paper presents a study of an induction motor with ring stator windings. The main idea of this solution is to give a higher flexibility in obtaining of two or more number of pole pairs simultaneously with a better utilization of the machine. The developed torque in connection with the demanded input power is the major task of the analysis. The results are based on experimental tests and FEM simulation.
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