IEEE Transactions on Industrial Electronics

Volume 35, Number 4, August 1988 Access to the journal on IEEE XPLORE IE Transactions Home Page

35.4.1	A. Moghaddamjoo, "Step-like signal processing with distinct finite number of levels ," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 489-493, August 1988. Abstract Link Full Text Abstract: An algorithm for filtering noisy step-like signals is proposed. This algorithm is based on the assumption of Gaussian contamination. In this procedure data within a moving window is divided into two almost equal clusters and a hypothesis tests (F-test) for differences in the means between two such clusters. Histograms analysis and/or our a priori knowledge about the number of discrete amplitudes in the ideal noise free signal provide information that is used to filter the signal further and produce a clean signal with the desired number of discrete amplitudes (levels). As an illustration the method is tested by simulation
35.4.2	A.K.S. Bhat, "Analysis and design of a DC/DC converter using square-wave output resonant inverter," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 494-501, August 1988. Abstract Link Full Text Abstract: The operating modes of a square-wave output resonant inverter when used in a high-frequency link DC/DC converter are presented and analyzed. The condition of minimum turn-off time for the switches in the discontinuous current mode is obtained. A simple design procedure for the DC/DC converter is presented and illustrated by an example. Experimental results obtained from a prototype converter are presented to verify the theory
35.4.3	C.F. Christiansen, M.I. Valla, C.H. Rivetta, "A synchronization technique for static delta-modulated PWM inverters," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 502-507, August 1988. Abstract Link Full Text Abstract: A synchronization technique for static delta-modulated PWM inverters is presented. This control strategy removes the frequency modulation inherent in the delta-modulated inverter. Furthermore, synchronization of the PWM pulses with the reference signal ensures balanced phase voltages in three-phase applications. The performance of the modulator is analyzed using digital simulations and is verified with experimental circuits
35.4.4	J.W. Dixon, Boon-Teck Ooi, "Indirect current control of a unity power factor sinusoidal current boost type three-phase rectifier," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 508-515, August 1988. Abstract Link Full Text Abstract: The indirect current control scheme has evolved from the success of the hysteresis current controlled voltage regulated rectifier, which has been shown to be capable of: unity and even leading power factor operation; near sinusoidal current waveforms; and bilateral power transfer without the need of bi-directional solid state power switches. The advance consists of replacing the inner hysteresis current feedback loop by the standard sinusoidal PWM control and in the process saving the cost of the current measuring transducers. The scheme is evaluated through tests on 1 KW size laboratory models and through digital simulations. A theory of the system dynamics is developed and stability boundaries are presented
35.4.5	Tian-Hua Liu, Chung-Ming Young, Chang-Huan Liu, "Microprocessor-based controller design and simulation for a permanent magnet synchronous motor drive," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 516-523, August 1988. Abstract Link Full Text Abstract: The speed control of a permanent magnet (PM) synchronous motor drive that is fed by a current hysteresis-controlled voltage-source inverter is investigated. The objective is to study the feasibility of implementing a microprocessor-based controller that may achieve complete software control of motor speed. A mathematical model and a digital control principle for controlling the PM synchronous motor are described. The sampling period and the controller parameters are determined analytically according to a linearized model. A systematic simulation procedure is proposed for verifying the feasibility of theoretical modeling and controller design. An experimental prototype system is constructed for correlating with the theoretical results. The experimental results closely follow theoretical predictions, thus validating the proposed control method
35.4.6	R.M. Davis, "A comparison of switched reluctance rotor structures," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 524-529, August 1988. Abstract Link Full Text Abstract: A theoretical comparison of torque production is made between a conventional switched reluctance motor having conventionally laminated salient rotor poles, and a novel structure that uses a cylindrical anisotropic rotor comprised of axially laminated layers of magnetic and nonmagnetic materials. By choosing identical conditions and dimensions in all respects other than the differing rotors and the consequential changes to the stators, and by including the influence of the available space for the windings, the torque production capabilities have been linked specifically to the rotor differences. The results, which are for identical maximum flux density and copper losses, show the salient rotor SR motor to be 20 percent better based on rotor volume and almost 100 percent better on stator plus endwinding volume
35.4.7	G.K. Dubey, "Analysis of DC drive fed by single-phase half-controlled converters in sequence control," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 530-536, August 1988. Abstract Link Full Text Abstract: Separately excited DC motors fed by multistage converters with sequence control are commonly used in mainline traction. The author describes the analysis and performance of a DC drive fed by a two-stage sequentially operated half-controlled converter. The modes of operation of the converter-motor system are identified and a method of performance calculation, taking these modes of operation into account, is presented. The nomograms, and the analytical method of calculating them, are presented for the calculation of an optimum value of filter inductance
35.4.8	P. Pillay, R. Krishnan, "Modeling of permanent magnet motor drives," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 537-541, August 1988. Abstract Link Full Text Abstract: Research has indicated that the permanent magnet motor drives, which include the permanent magnet synchronous motor (PMSM) and the brushless DC motor (BDCM) could become serious competitors to the induction motor for servo applications. The PMSM has a sinusoidal back EMF and requires sinusoidal stator currents to produce constant torque while the BDCM has a trapezoidal back EMF and requires rectangular stator currents to produce constant torque. The PMSM is very similar to the wound rotor synchronous machine except that the PMSM that is used for servo applications tends not to have any damper windings and excitation is provided by a permanent magnet instead of a field winding. Hence the d, q model of the PMSM can be derived from the well-known model of the synchronous machine with the equations of the damper windings and field current dynamics removed. Because of the nonsinusoidal variation of the mutual inductances between the stator and rotor in the BDCM, it is also shown that no particular advantage exists in transforming the abc equations of the BCDM to the d, q frame. Hence the solution of the original abc equations is proposed for the BDCM
35.4.9	M.F. Rahman, Aun-Neow Poo, "An application oriented test procedure for designing microstepping step motor controllers," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 542-546, August 1988. Abstract Link Full Text Abstract: Describes an application oriented set-up for determining current references for a microstepping step motor controller. This eliminates the need for calculating these references from motor characteristics. Motor nonlinearities and asymmetries are taken into consideration and references for controllers can be obtained by an unattended test for any microstep size desired
35.4.10	B.K. Bose, P.M. Szczesny, "A microcomputer-based control and simulation of an advanced IPM synchronous machine drive system for electric vehicle propulsion," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 547-559, August 1988. Abstract Link Full Text Abstract: Describes a high-performance microcomputer-based control and digital simulation of an inverter-fed interior permanent magnet (IPM) synchronous machine that uses a neodymium-iron-boron magnet. The fully operational four-quadrant drive system includes a constant-torque region with zero speed operation and a high-speed field-weakening constant-power region. The control uses the vector or field-oriented technique in constant-torque region with the direct axis aligned to the stator flux, whereas the constant-power region control is based on torque angle orientation of the impressed square-wave voltage. All the key feedback signals for the control are estimated with precision. The drive system is basically designed with an outer torque control loop for electric vehicle application, but speed and position control loops can be added for other industrial applications. The distributed microcomputer-based control system is based on Intel-8096 microcontroller and Texas Instruments TMS32010 type digital signal processor
35.4.11	R. Krishnan, A.S. Bharadwaj, P.N. Materu, "Computer-aided design of electrical machines for variable speed applications," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 560-571, August 1988. Abstract Link Full Text Abstract: Product life cycle has decreased and demands for new products have emerged due to competition, modern industrial needs, and rapidly changing technology. This has necessitated changes in design, development, and manufacturing processes to improve quality and efficiency and to reduce cost. Computer-aided design (CAD) helps to meet this challenge in the design evaluation and final product design stages. The authors present the development of interactive software for the optimal design of a motor intended for variable speed applications. The use of finite element analysis methods is proposed as an indispensable part of the CAD system for electrical machine design. An illustration of the method is given for the design of a switched reluctance motor excited with rectangular blocks of current
35.4.12	D. Ciscato, A. Fehl, L. Turolla, "Microstep control of floppy disk drive," IEEE Trans. on Industrial Electronics, vol. 35, no. 4, pp. 572-575, August 1988. Abstract Link Full Text Abstract: A microprocessor on board of a 5 1/4 in floppy disk unit can be used for microstep control of the step motor able to compensate for unavoidable track deformations. The feedback is derived from a special signal recorded at the beginning of each sector. The resulting track following system is very attractive for magnetic peripherals with very high track density (192 tpi). The authors describe the design of the control system and its implementation using a Z80A system