Steady-state analysis of an induction motor fed from a current-source inverter using complex-state (Park's) vector

Subrahmanyam, V.; Subbarayudu, D.

doi:10.1049/piee.1979.0100

Cited by 5 publications

(2 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although the rise is given by (1-exp-(L-M)t/R) in pu at a constant speed, it can be approximated [7] by a straight line so that the actual current resembles a trapezoid as shown in figure 2. This avoids the detailed calculation of (6), (7) and (8). Note that high frequency switching with either hysteresis or PWM logic is used to track the rectangular references.…”

Section: Ivdeviation Of the Practical Machine From The Idealizedmentioning

confidence: 99%

An investigation into the torque behavior of a brushless DC motor drive

Pillay¹,

Krishnan²

Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting

View full text Add to dashboard Cite

This paper uses a previously developed model for the brushless dc motor (BDCM) to investigate its torque behavior. When the input currents and motor flux linkages are perfect, no torque pulsations are produced in this motor. However imperfections in the current arise due to finite commutation times while imperfections in the flux linkage can arise due to the phase spread, finite slot numbers and manufacturing tolerances. Using an harmonic analysis, the effects of these imperfections on the production of torque in a BDCM are investigated. It is shown that torque pulsations and a reduction in the average value of torque is produced, both of which can affect the performance of torque, speed and position servos. 1.INTRODUCTIONAC servo drives are commanding a larger share of the servo market each year. The advantages of ac servo drives over dc include increased robustness, reduced maintenance and higher torque and speed bandwidths. The ac motors that are used include the induction, permanent magnet synchronous and permanent magnet brushless dc machines [I].Some of the advantages of permanent magnet machines over induction [ 2 ] include higher torque to inertia ratios and power densities, lower rated rectifier and inverter ratings during constant torque operation and higher efficiencies. Hence permanent magnet machines may be preferable for applications where weight or efficiency is of importance, for example in the aerospace industry or electric vehicles.The permanent magnet synchronous motor (PMSM) and the brushless dc motor (BDCM) have many similarities. They both have permanent magnets on the rotor and require alternating stator currents to produce constant torque. The difference [3,4] between them is that the PMSM has a sinusoidal back emf while the BDCM has a trapezoidal back emf. This leads to different operating and control requirement for these two machines as explained in [4].The dynamic behavior of a BDCM has been studied [SI and the results indicate that the BDCM can be subject to severe torque pulsations [ 6 ] due to the stator currents commutating from one phase to another. Torque pulsations are also created by the magnet flux linkage deviating from the ideal.The above imperfections also create the possibility of a reduction in the average value of torque. These phenomena can affect the performance of torque, speed or position servos.The object of this paper is to quantitatively determine the motor characteristics that affect the production of torque in a BDCM. Attention is paid to the overall torque pulsations as well as individual torque harmonics. The torque behavior during flux weakening operation is also addressed. The nonsinusoidal currents and flux linkages are represented by Fourier series and the impact of R.Krishnan different flux and current harmonics on the motor torque are investigated.The paper is organized as follows: Section I1 presents the mathematical model of a BDCM. Section 111 discusses torque production in a BDCM and shows how the dynamic mathematical model in section I1 can be used ...

show abstract

Section: Ivdeviation Of the Practical Machine From The Idealizedmentioning

confidence: 99%

An investigation into the torque behavior of a brushless DC motor drive

Pillay¹,

Krishnan²

Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting

View full text Add to dashboard Cite

show abstract

“…Using the angle and the instantaneous frequency of the space vector, short-circuit fault in the converter diodes can be detected [11]. The complex state vector is a powerful tool in the analysis of ac machines [63]. In [8] and [9], the open-circuit faults in a three-phase VSI are detected using the trajectory of the current space vector.…”

Section: Space Vector Analysismentioning

confidence: 99%

Model-based fault diagnosis for voltage source inverters

Alavi¹

View full text Add to dashboard Cite

A thesis submitted to the Nanyang Technological University in fulfillment of the requirement for the degree of Doctor of Philosophy 2015 Acknowledgments I would like to express my sincere appreciation to my supervisor, Professor Wang Danwei, and co-supervisor, Dr. Luo Ming, for their invaluable guidance, support and suggestions. I like to thank the A*STAR (Agency for Science, Technology and Research) for their financial support in form of SINGA (Singapore International Graduate Award) during my PhD studies. I also want to thank my colleagues in Singapore Institute of Manufacturing Technology (SIMTech) and Intelligent Robotics Lab of NTU, for their generous help. Last but not least, I want to thank my family, for their constant love and encouragement.

show abstract