# 1990 Fourth International Conference on Power Electronics and Variable-Speed Drives (Conf. Publ. No. 324)

## Filter Results

Displaying Results 1 - 25 of 100
• ### Performance prediction in saturated variable reluctance and hybrid motors

Publication Year: 1990, Page(s):231 - 236
Cited by:  Papers (4)
| | PDF (360 KB)

Two methods of predicting the torque/rotor angular position characteristics of switched reluctance motors (SRMs), and both PM hybrid and variable reluctance (VR) stepping motors have been presented and compared. Known flux-linkage data forms the basis for the methods. Although experimental flux-linkage characteristics were used in this comparison, to concentrate attention on the methods, calculate... View full abstract»

• ### A parallel resonant power supply for induction cooking using a GTO

Publication Year: 1990, Page(s):224 - 230
Cited by:  Papers (9)
| | PDF (276 KB)

A parallel resonant inverter is described which is suitable for commercial and domestic use as an induction cooking power supply. A gate turn off thyristor (GTO) operating a gate assisted zero current switched mode (ZCSM) in this circuit provides several advantages including high operating frequency (>40 kHz), and good efficiency (>95%). The circuit makes good use of the high GTO current and... View full abstract»

• ### Analysis and experimental results of inverter with resonance circuits and sinusoidal output voltage

Publication Year: 1990, Page(s):218 - 223
| | PDF (220 KB)

The analysis simulation results and experimental results of the inverters with resonance circuits and sinusoidal output voltage are presented. The three-phase series-parallel inverter for high-speed drives is an example of dynamic properties of a closed-loop drive system. Simulation results were obtained using the electronic circuit analysis program package NAP-2 which was run on an IBM PC/AT comp... View full abstract»

• ### Three phase parallel loaded resonant converter with fixed frequency operation

Publication Year: 1990, Page(s):115 - 120
| | PDF (248 KB)

A three phase parallel resonant converter (PRC) operating above resonant frequency with phase controlled voltage conversion ratio, is proposed for offline power conditioning. A simplified analysis of the converter is carried out and theoretical design curves produced. These are compared to those of a single phase PRC. An experimental circuit is produced and the results compared to theory. The suit... View full abstract»

• ### A dynamic power factor corrected resonance power converter

Publication Year: 1990, Page(s):212 - 217
Cited by:  Patents (1)
| | PDF (316 KB)

The authors present a dynamic power factor corrected resonance power supply employing a single high speed GTO thyristor. A description of the modes of operation and the design and evaluation of a 300 W, 80 kHz prototype model is included. The design of the isolation transformer and other magnetic components are described in detail. The selection of circuit components and the design and implementat... View full abstract»

• ### Optimal pulsewidth modulation for GTO current source inverter fed induction motor drive system

Publication Year: 1990, Page(s):110 - 114
| | PDF (204 KB)

The main advantage of such a converter is that it can supply a synchronous or asynchronous machine with voltages and currents having low harmonic contents. For many applications, this is not merely an aesthetic issue; it is an operating necessity. In particular, in two fields abounding in adjustable-speed drives-pumps and test benches-there is no doubt that the current converter described represen... View full abstract»

• ### Instabilities in transformer-coupled Cuk-converters and their solution at higher power levels

Publication Year: 1990, Page(s):207 - 211
Cited by:  Papers (1)
| | PDF (192 KB)

In many power control applications, a buck-boost chopper is necessary, in principle operating between two DC sources. When transformer isolation is a prerequisite, the Cuk-converter becomes a minimum component topology when considering certain conditions that do not normally manifest themselves at low power levels. The authors describe an application where it was necessary to achieve efficiencies ... View full abstract»

• ### Voltage drops effects in bipolar transistor PWM inverters

Publication Year: 1990, Page(s):104 - 109
Cited by:  Papers (2)
| | PDF (308 KB)

Pulse width modulation (PWM) control applied to bipolar junction transistor (BJT) voltage source inverter (VSI) is the most used solution for adjustable speed drives in the power range up to 100 kW. Open loop control to make the V/f rated constant is generally used. However, the inverter output voltage is not purely sinusoidal and the distortion is due to a bunch of power devices features: lock-ou... View full abstract»

• ### Operation of the permanent magnet synchronous machine without a mechanical sensor

Publication Year: 1990, Page(s):51 - 56
Cited by:  Papers (23)  |  Patents (6)
| | PDF (264 KB)

Permanent synchronous machines (PSM) score against asynchronous machines because of their simple control structure and a higher efficiency due to the small rotor losses. The necessity of sensors for angular speed and position represents a considerable restriction of robustness. Because of this, it is the aim of much research to substitute the mechanical sensors with more sophisticated models using... View full abstract»

• ### High frequency DC-DC forward resonant converter

Publication Year: 1990, Page(s):201 - 206
| | PDF (228 KB)

The author have modelled, designed and built a DC-DC one output resonant converter, 5 V-100 W maximum, and extendable toward multi-output and higher power convertors. Numerous problems are solved such as choice of the structure, choice of the components with their parasitic impedance at high operating frequency, determination of the losses, resonance conditions. They present a steady-state analysi... View full abstract»

• ### PWM control of a three-level inverter-principles and practical experience

Publication Year: 1990, Page(s):98 - 103
Cited by:  Papers (6)  |  Patents (3)
| | PDF (364 KB)

The three-level inverter-also called neutral-point-clamped inverter-is a voltage source inverter for high power drive applications. The author a presents a short description of the theoretical background and a discussion of some new aspects of three-level inverter control theory. The control algorithm has been implemented on a TMS320C25 signal processor. Data flow diagrams of the control program a... View full abstract»

• ### A new approach for the field-oriented control of brushless, synchronous, permanent magnet machines

Publication Year: 1990, Page(s):46 - 50
Cited by:  Papers (1)
| | PDF (136 KB)

A new approach to the field oriented control of brushless DC machines is presented and is applied to the control of a permanent magnet synchronous motor (PMSM). The motor modelling is based on Park's d-q components. The choice of an original control algorithm, decoupling the control of the direct and quadrature currents, leads to a mathematical model easy to implement and use. Moreover, this numer... View full abstract»

• ### Modelling of switching transients in a GTO bridge inverter

Publication Year: 1990, Page(s):196 - 200
| | PDF (236 KB)

A practical investigation, with some simplified supporting analysis, into the transient overvoltages induced across the stray circuit inductances by fast device switching in high power GTO thyristor circuits has previously been reported by Hall and Al Hakim (see IEE conf. publ. 291, p.103-6, 1988). The extension of that work into a full circuit model for the H-bridge inverter with inductive load i... View full abstract»

• ### Novel modulation techniques for DC-side commutated inverters

Publication Year: 1990, Page(s):92 - 97
Cited by:  Papers (4)
| | PDF (416 KB)

The author presents three novel modulation techniques for DC-side commutated inverters where the single commutation circuit is activated only once per switching period. The new techniques are modifications of the sinusoidal modulation with sawtooth carrier, space vector modulation and current-hysteresis modulation with constant switching frequency. The techniques are compared, with the traditional... View full abstract»

• ### Practical design procedure for PWM torque controllers in the application of permanent magnet synchronous machine (PMSM) drives

Publication Year: 1990, Page(s):40 - 45
Cited by:  Papers (1)
| | PDF (296 KB)

An investigation into the design procedure of current controlled inverters for permanent magnet drives is presented. The control strategy of the current controlled inverter is based on the principles of the ramp-comparison controller. Design formulas are derived for constant switching frequency applications such that 100% modulation is maintained. The procedure is tested on a developed 30 kVA inve... View full abstract»

• ### Modelling and simulation of a synchronous motor supplied by a GTO voltage inverter

Publication Year: 1990, Page(s):190 - 195
Cited by:  Papers (1)  |  Patents (2)
| | PDF (180 KB)

With the development of self-commutated inverters employing GTO thyristors, new voltage waveforms which improve machine performance can be synthesized. The behavior of a synchronous motor supplied by GTO voltage inverter differs significantly from its behavior to sinusoidal input voltages in both transient and steady state regimes. For accurate prediction of the machine characteristics in time dom... View full abstract»

• ### Switching limits in static converters using soft commutation

Publication Year: 1990, Page(s):263 - 268
Cited by:  Papers (5)
| | PDF (332 KB)

The authors investigate the problem of switching limits called commutation limits' and show how it can be solved in the case of a PWM inverter in soft commutation operation. The authors discuss motions of the commutation cell' and then point out those cells which are susceptible to operating in soft commutation mode, particularly the one which, according to the real nature of the power switches,... View full abstract»

• ### Space vector modulation: an engineering review

Publication Year: 1990, Page(s):87 - 91
Cited by:  Papers (9)  |  Patents (1)
| | PDF (352 KB)

The space vector pulse width modulation (PWM) technique has rapidly gained favour among industrial drives manufacturers as an alternative to the traditional regularly sampled triangulation method. The authors present a practical engineering comparison between the two modulation techniques and show that the space vector technique inherently generates a superior' PWM waveform. In particular the wav... View full abstract»

• ### Analysis, simulation and practical evaluation of torque vector control strategies for medium power highly responsive PMSM drives

Publication Year: 1990, Page(s):34 - 39
| | PDF (400 KB)

Torque vector control strategies on two different types of permanent magnet synchronous machines (PMSM) are investigated, and the performance of a medium power (13 kW) highly responsive surface mount magnet PMSM is practically evaluated. The machine is fed by a developed oversized 30 kVA current hysteresis-controlled voltage source inverter. The dynamics of the drive are simulated and compared to ... View full abstract»

• ### Simulation of state-events in power electronic devices

Publication Year: 1990, Page(s):184 - 189
Cited by:  Papers (1)
| | PDF (356 KB)

State-events arise in power electronic devices such as convertors. It is shown that state-events require special attention in order to avoid errors in the numerical integration procedure. The error sources are indicated and solutions provided. A simulation study indicates that proper dealing with state-events yields both faster and more accurate responses. A comparison with the electronic circuit-... View full abstract»

• ### Pulsing circuits for high power high repetition rate lasers

Publication Year: 1990, Page(s):472 - 477
Cited by:  Papers (2)
| | PDF (372 KB)

High repetition rate excimer laser systems with average output powers extending into the kW range are becoming increasingly important in a large number of scientific and industrial applications. These outputs can be achieved with optical pulse energies in excess of 0.5 J at repetition rates above 2 kHz. An experimental four stage compressor is constructed using saturable inductors constructed from... View full abstract»

Publication Year: 1990, Page(s):258 - 262
| | PDF (204 KB)

In resonant link converters a new approach to the problem of low loss switching in voltage fed converters has been taken. Several considerations require that-in order to derive maximum benefit from this technology-the resonant frequency be in the ultrasonic range (20 kHz to 100 kHz), whether bipolar transistors or GTOs are used as switching elements. The losses in the input resonant link has there... View full abstract»

• ### Steady state analysis and experimental investigation of a doubly-fed induction machine supplied by a current-source' cycloconverter in the rotor

Publication Year: 1990, Page(s):81 - 86
Cited by:  Papers (3)
| | PDF (180 KB)

The doubly-fed induction machine (DFIM) has taken increasing importance for variable speed drives due to the progress of field oriented control. It is an induction machine supplied by AC mains on the stator side and controlled from the rotor side by changing the magnitude, frequency and phase of the rotor voltage or current. It can operate as well as a motor or a generator and its speed may be bot... View full abstract»

• ### A new nonresonant mode zero-voltage switching DC-DC converter using phase-shifted PWM

Publication Year: 1990, Page(s):27 - 33
Cited by:  Papers (3)
| | PDF (316 KB)

In order to reduce the size and weight of switch mode power supplies, resonant converters have attracted a lot of attention because of their low switching losses and low EMI. However, resonant converters include several disadvantages such as high resonant-current of voltages for semiconductor devices, high VA ratings for resonant components, variable switching frequency and complex control. To all... View full abstract»

• ### System performance and design aspects for HVDC back-to-back ties without smoothing reactors

Publication Year: 1990, Page(s):539 - 544
Cited by:  Papers (3)
| | PDF (272 KB)

The authors present some guidance for performance requirements and the necessary steps to establish the final size of a smoothing reactor inductance for a HVDC back-to-back converter. The authors describe different design aspects, which have to be considered for selection of the smoothing reactor size. Due to economic aspects, losses and the electrical performance of the converters have to be opti... View full abstract»