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 paper 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 the modeling in complex frequency domain (s-domain) has been taken up using small perturbation model. Such a model clearly shows role of induction motor as noise function or disturbance function with respect to the open loop block diagram of synchronous motor. Such finding can be quantized in terms of important results and that is done in the present paper such that the results can help the designer for the successful design of a synchronous motor drive system.

Keywords:

Current source inverter, computer simulation, induction motor, small perturbation model, starting transients, synchronous machine,

References

1. Al-Ohaly, A.A., R.M. Hamouda and M.A. Badr, 1997. Torsional oscillation associated with starting of three phase synchronous motors from a single phase supply. IEEE Trans. Energ. Conver., 12(1): 10-16.
   CrossRef    
2. Chattopadhyay, A.B., T. Sunil and C. Ruchira, 2011. Analysis of steady state stability of a Csi fed synchronous motor drive system with damper windings included. Trends Appl. Sci. Res., 6(9): 992-1005.
   CrossRef    
3. Das, J.C. and J. Casey, 1999. Characteristics and analysis of starting of large synchronous motors. Proceeding of the Industrial and amp; IEEE Conference on Commercial Power Systems Technical Conference, Sparks, NV.
   CrossRef    
4. Gordon, R.S., S.B. Dewan and W.A. Wilson James, 1974. Synchronous motor drive with current-source inverter. IEEE T. Ind. Appl., IA-10(3): 412-416.
   CrossRef    
5. Isfahani, A.H. and S. Vaez-Zadeh, 2011. Effects of magnetizing inductance on start-up and synchronization of line-start permanent-magnet synchronous motors. IEEE T. Magnet., 47(4): 823-829.
   CrossRef    
6. Knight, A.M. and C.I. McClay, 2000. The design of high-efficiency line-start motors. Proceeding of the 34th IAS Annual Meeting, Industry Applications Conference, Conference Record of the 1999 IEEE, 1: 516-522.
   
7. Marx, D., S. Pierfederici and B. Davat, 2008. Nonlinear control of an inverter motor drive system with input filter-large signal analysis of the DC-link voltage stability. Proceeding of the IEEE Power Electronics Specialists Conference, PESC, Rhodes, U.S.A, pp: 498-503.
   
8. Najafi, S. and N.C. Kar, 2007. Effect of short-circuit voltage profile on the transient performance of saturated permanent magnet synchronous motors. Proceeding of the IEEE Power Engineering Society General Meeting, Tampa, FL, pp: 1-6.
   CrossRef    
9. Sergelen, B., 2007. Mathematical model of salient pole synchronous motors supplied by a frequency converter. Proceeding of the International Forum on Strategic Technology, IFOST 2007, Ulaanbaatar, pp: 390-393.
   CrossRef    
10. Wang, X. and N. Ren, 2003. Simulation of asynchronous starting process of synchronous motors based on matlab/simulink. Proceeding of the 6th International Conference on Electrical Machines and Systems, ICEMS, Beijing, China, 2: 684-687.
    
11. Weifu, L., L.Yingli and Z.Haisen, 2012. Influences of rotor bar design on the starting performance of line-start permanent magnet synchronous motor. Proceeding of the 6th International Conference on Electromagnetic Field Problems and Applications (ICEF), Dalian, Liaoning, pp: 1-4.
    
12. Xianhao, M., S. Ding and W. Li, 2006. Calculation and analysis of magnetic fields and temperature fields for salient pole synchronous motors in the process of starting. Proceeding of the International Conference on Power System Technology, Chongqing, pp: 1-6.
    CrossRef    PMCid:PMC2227316    

Competing interests

The authors have no competing interests.

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