TAILIEUCHUNG - Recent Developments of Electrical Drives - Part 6

Recent Developments of Electrical Drives - Part 6. The book stating the recent developments of electrical drives, can be useful for engineers and researchers investigating and designing electrical and electronic devices as well as for students and young researchers dealing with electrical and electronic engineering, computer sciences (advanced computer modelling, sophisticated control systems with artificial intelligence tools applied, optimal design bye use of classical and genetic algorithms employed), applied mathematics and all the topics where electromagnetic, thermal, mechanical phenomena occur | 34 Perez-Donsion Figure 13. Graphic representation of speed vs. time for different inertia torque M with Tl 0 and Sl 1. The permanent magnets influence about the transient behavior of the PMSM is very important. As higher are the equivalent currents of the magnets as lower are the slips of the transient response. In Fig. 18 we can observe that if the current of the magnet decrease below a certain value the motor is not capable of take up the overload and the motor lost the synchronism. The optimum value of this current depends amount other factors of the magnets braking torque at the synchronous speed proximity. If this value is overcome they will appear higher oscillations during the transient operation. The rotor geometry and in consequence the relationship between the d-axis and q -axis reactances also modify the PMSM behavior as in the same way that for the equivalent current we must obtain an optimum value for the relation Xd Xq and also it is important to obtain the most appropriate squirrel cage resistance value. Figure 14. Graphic representation of the torque of the squirrel cage vs. time for a sudden decrease of the load. 35 I-3. Coupled Model for PMSM Figure 15. Graphic representation of the torque of the squirrel cage vs. time for a sudden increase of the load. Really the number of variables that have influence about the starting and synchronization processes of a PMSM take into account the motor and also the load is very higher and then it is very difficult know in advance a set of necessary conditions for the correct synchronization of the PMSM. Then for develop an analyze of this type it is necessary take into account the parametric variation of the main magnitudes that have influence about the synchronization process. In this particular case we have analyzed this process in term of his synchronization energy specially we have considered the property capacity of synchronization of the motor that Figure 16. Graphic representation of the magnets and .

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