IEEE Transactions on Industrial Electronics

Volume 40, Number 6, Dec 1993 Access to the journal on IEEE XPLORE IE Transactions Home Page

40.6.1	R.J. Lalonde, T.T. Hartley, J.A. de Abreu-Garcia, "Least-squares model order reduction enhancements," IEEE Trans. on Industrial Electronics, vol. 40, no. 6, pp. 533-541, Dec 1993. Abstract Link Full Text Abstract: Two enhancements to the least-squares (LS) discrete-time model order reduction (MOR) method are presented: scaling and frequency response matching. Scaling generally improves the low-frequency fit between the reduced-order model (ROM) and the original model. For exact gains at specific frequencies, optional frequency response constraints can easily be added to the LS MOR method. An example is presented that illustrates these enhancements. The example model is reduced with the Hankel norm, weighted impulse response gramian, and LS MOR methods. Plots of error versus frequency are given for each of the three MOR methods
40.6.2	M.K. Kazmierczuk, D. Czarkowski, N. Thirunarayan, "A new phase-controlled parallel resonant converter," IEEE Trans. on Industrial Electronics, vol. 40, no. 6, pp. 542-552, Dec 1993. Abstract Link Full Text Abstract: A phase-controlled resonant converter was obtained by connecting in parallel the AC loads of two identical parallel resonant inverters. A phase shift between the drive signals of the two inverters controls the amplitude of the output voltage of the new inverter. A voltage-driven rectifier is used as an AC load of the inverter, which results in a phase-controlled parallel resonant DC-DC converter. A frequency-domain analysis is performed for the steady-state operation of the inverter, and two types of voltage-driven rectifiers and design equations are derived. The converter can be operated at a constant switching frequency, which reduces EMI problems. It is found that for switching frequencies higher than the resonant frequency by a factor of 1.07, the load of each switching leg is inductive. The converter is capable of regulating the output voltage in the range of load resistance from full-load to no-load. Experimental results are presented for a prototype of the phase-controlled parallel resonant converter with a center-taped rectifier tested at an output power of 50 W and a switching frequency of 116 kHz
40.6.3	M. Iwasaki, N. Matusi, "Robust speed control of IM with torque feedforward control," IEEE Trans. on Industrial Electronics, vol. 40, no. 6, pp. 553-560, Dec 1993. Abstract Link Full Text Abstract: The authors describe a digital signal processor-based (DSP-based) robust speed control for an induction motor (IM) with the load-torque observer and the torque feedforward control. In the proposed system, the load torque is estimated by the minimal-order state observer based on the torque component of a vector-controlled IM. Using the load-torque observer, a speed controller can be provided with a torque feedforward loop, thus realizing a robust speed control system. The control system is composed of a DSP-based controller, a voltage-fed pulsewidth modulated (PWM) transistor inverter and a 3.7 kW IM system. An eccentric load with an arm and a weight is coupled to the IM and it generates the sinusoidal gravitational fluctuating torque. Experimental results show robustness against disturbance torque and system parameter change
40.6.4	S.M. Abdulrahman, J.G. Kettleborough, I.R. Smith, "Fast calculation of harmonic torque pulsations in a VSI/induction motor drive," IEEE Trans. on Industrial Electronics, vol. 40, no. 6, pp. 561-569, Dec 1993. Abstract Link Full Text Abstract: The authors present a frequency-domain model for the accurate and efficient prediction of harmonic torque pulsations in three-phase VSI/induction motor drives, which enables rapid consideration to be given to their potentially harmful effects in producing uneven shaft rotation. A detailed analysis is provided for both quasi-square wave (QSW) and optimal pulse-width modulated (PWM) modes of switching operation, with the latter technique designed to improve the low-speed drive performance by eliminating low-order harmonic components. A comparison is made with practical results obtained from an experimental 0.56 kW drive and from a comprehensive time-domain model using a numerical solution of the machine equations. It is shown that accurate prediction of the actual performance is provided
40.6.5	C.C. Chan, J.Z. Jiang, G.H. Chen, K.-T. Chau, "Computer simulation and analysis of a new polyphase multipole motor drive," IEEE Trans. on Industrial Electronics, vol. 40, no. 6, pp. 570-576, Dec 1993. Abstract Link Full Text Abstract: A new configuration for a high-power-density, high-efficiency polyphase multipole permanent magnet motor and its control system are presented. The mathematical model and simulation for this motor drive are presented in detail. The motor is essentially a kind of brushless DC motor with a novel arrangement of its magnet and winding. The control system is virtually a dual closed-loop system with a current controller as the inner loop and a speed controller as the outer loop. State-space equations are used for the mathematical model of the motor, and real-time simulation is applied for the controller and switching devices. The simulation results are verified with the experimental results and shown to be very satisfactory
40.6.6	J. Xu, M. Grotzbach, "Time-domain analysis of half-wave zero-current switch quasi-resonant converters by using SPICE," IEEE Trans. on Industrial Electronics, vol. 40, no. 6, pp. 577-579, Dec 1993. Abstract Link Full Text Abstract: A SPICE-compatible time-domain equivalent circuit model of half-wave zero-current switch (HW-ZCS), based upon which half-wave zero-current-switch quasi-resonant converters (HW-ZCS-QRCs) can be analyzed by using SPICE, is proposed. As an example, the open-loop time-domain behavior of a buck (HW-ZCS-QRC) can be analyzed without any simplifying assumptions by using SPICE to illustrate the applications of the equivalent circuit model proposed