Abstract
Modeling of synchronous motor plays a dominant role in designing complicated drive system for different applications, especially large blower fans etc., for steel industries. As synchronous motor has no inherent starting torque generally it is started as an induction motor with the help of a damper winding and it pulls into synchronism under certain conditions. The present study exactly concentrates on this particular zone of transition from induction motor to synchronous motor mode for a current source inverter fed synchronous motor drive system. Due to complexity of synchronous motor in terms of number of windings and finite amount of air gap saliency, direct modeling of such transition zone in time domain becomes cumbersome at the first instance of modeling. That is why firstly the modeling is presented in complex frequency domain and then the time domain modeling is obtained by applying inverse Laplace transform technique. Apparently it seems to be a straight forward mathematical treatment but involvement of Convolution Integral for converting the formulation from s-domain to time domain becomes a matter of interest and it may draw the attention of various researchers working in this area. Furthermore the time domain response of the disturbance function may help a designer to fix up the time instant when the pull in phenomenon will be imposed by throwing the field winding to a DC supply.
Highlights
Many constant speed applications such as fans, fuel pump and compressors comprising a considerable amount of total electrical appliances (Isfahani and Vaez-Zadeh, 2011) basically need a 3 phase synchronous motor
Even though permanent magnet synchronous motors are widely used in such applications, current source inverter fed normal synchronous motors can be applied in many constant speed applications (Knight and McClay, 2000; Weifu et al, 2012)
From the nature of the problem formulation it is already well known that the asynchronous behavior of the synchronous machine in motor mode basically can be looked upon as a disturbance phenomenon; even though this should not be treated as a negative one because it indicates basically the starting method of synchronous motor
Summary
Many constant speed applications such as fans, fuel pump and compressors comprising a considerable amount of total electrical appliances (Isfahani and Vaez-Zadeh, 2011) basically need a 3 phase synchronous motor. The steady state stability study of a current source inverter fed synchronous motor was basically initiated in 1974 (Gordon et al, 1974) and after this as an extension, Chattopadhyay et al (2011) presented a detailed analysis of a current source inverter fed synchronous motor drive system taking damper windings into account in 2011. The research paper (Ma et al, 2006) explains the analysis of magnetic fields and temperature fields for a salient pole synchronous motor in the process of steady state. They have used the d-q model of the synchronous motor but the role of field winding in transition from induction motor to synchronous motor is not reflected in the mathematical model
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