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Author:Dlala, Emad Ali
Title:Analysis of Hysteresis Torque in a High-Speed Induction Motor
Suurnopeussähkökoneen hystereesimomentti
Publication type:Master's thesis
Publication year:2005
Pages:94      Language:   eng
Department/School:Sähkö- ja tietoliikennetekniikan osasto
Main subject:Sähkömekaniikka   (S-17)
Supervisor:Arkkio, Antero
Instructor:Saitz, Julius
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Location:P1 Ark S80     | Archive
Keywords:high-speed induction motor
solid rotor
semi-hard magnetic material
hysteresis modeling
the Preisach model
hysteresis torque
suurnopeussähkökone
massiiviroottori
puolikova magneettinen materiaali
hystereesi
mallinnus
Preisach-malli
hystereesimomentti
Abstract (eng): This work is carried out toward the development of high-speed motor design technology.
The thrust of this research is twofold: First, to address the problem of modelling hysteresis in solid rotors whose iron made of magnetically semi-hard material.
Second, to investigate the consequent hysteresis torque acting on the solid rotor of a high-speed induction motor.

In hysteresis torque calculation, the accurate modelling of hysteresis loops is a priority should be superiorly handled.
In the absence of a delicate straightforward method to model symmetrical minor loops with satisfactory results, a novel method for modelling symmetrical minor loops in hysteresis magnetic media is introduced.
The proposed method is simple and effective.
It takes on experimentally measured symmetrical minor loops combined with certain portions of the initial magnetization curve (the an hysteretic curve) to identify the Preisach distribution function.
The numerical simulations and experimental results show that the presented method is much more adequate than other existing methods for predicting symmetrical minor loops in terms of both the modelling quality and the computation time.

We also examine the hysteresis torque produced by a solid rotor of a high-speed induction motor.
By applying an experimental method to an unloaded high-speed induction motor it has been possible to determine the change of power at small positive and negative slips.
The change of power is believed to correspond to the hysteresis torque associated with the high-speed induction motor.
Because of the two fundamental reasons that the rotor of the high-speed motor is solid and made of semi-hard ~ material, it is found that under certain measuring conditions the obtained hysteresis torque is relatively significant and approximately represents 2.2% of the rated torque.
ED:2005-04-13
INSSI record number: 28266
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