The technique of vector space decomposition control voltage source inverter fed dual three-phase induction machines is presented in this paper. By decomposition, the analytical modeling and machine are accomplished three two-dimensional orthogonal subspaces dynamics electromechanical energy conversion related nonelectromechanical variables thereby totally decoupled. A PWM also developed based on to limit 5th, 7th, 17th, 19th,... harmonic currents which such a system would be otherwise...

Trends in power semiconductor technology indicate a tradeoff the selection of devices terms switching frequency and voltage-sustaining capability. New converter topologies permit modular realization multilevel inverters using hybrid approach involving integrated gate commutated thyristors (IGCTs) insulated bipolar transistors (IGBTs) operating synergism. This paper investigates conversion system typically suitable for high-performance high-power applications. system, designed 4.16 kV/spl...

This paper provides analytical and graphical methods for the study, performance evaluation design of modern carrier-based pulse width modulators (PWMs), which are widely employed in PWM voltage-source inverter (VSI) drives. Simple techniques generating modulation waves high-performance described. The two most important modulator characteristics-the current ripple switching losses-are analytically modeled. illustration these often complex multivariable functions accelerate learning process...

Current regulation plays an important role in modern power electronic AC conversion systems. The most direct strategy to regulate such currents is use a simple closed loop proportional-integral (PI) regulator, which has no theoretical stability limits as the proportional and integral gains are increased, since it only second order system. However, pulsewidth modulation (PWM) transport controller sampling delays limit gain values that can be achieved practical Taking these limitations into...

This paper compares the many fault tolerant three-phase ac motor drive topologies that have been proposed to provide output capacity for inverter faults of switch short or open-circuits, phase-leg short-circuits, and single-phase open-circuits. Also included is a review respective control methods inverters including two-phase unipolar methods. The voltage current space in terms dq components identified each topology fault. These quantities are then used normalize power system during standard...

We present an analytical method for calculation of no-load magnetic field distribution in the slotted air gap a surface permanent-magnet (PM) motor with radial or parallel magnetization. The introduces notion complex relative air-gap permeance, calculated from conformal transformation slot geometry, to take into account effect slotting. As result, accurate solution both and tangential components flux density can be obtained which shows excellent agreement results finite-element simulations....

In this paper, a generalized discontinuous pulsewidth modulation (GDPWM) method with superior high operating range performance characteristics is developed. An algorithm which employs the conventional space-vector PWM in low range, and GDPWM established. As result, current waveform quality, switching losses, voltage linearity overmodulation region of voltage-source inverter (PWM-VSI) drive are optimized online, as opposed to modulators fixed characteristics. Due its compactness, simplicity...

Previous work has shown that space vector modulation and carrier for two-level inverters achieve the same phase leg switching sequences when appropriate zero sequence offsets are added to reference waveforms modulation. This paper presents a similar equivalence between disposition (PD) strategies applied diode clamped, cascaded N-level or hybrid multilevel inverters. By analysis of time integral trajectory converter voltage, shows optimal harmonic profile modulator occurs two middle vectors...

An analysis method is developed for modeling of multi phase cage induction motors with asymmetry in the stator, arising due to an interturn fault resulting a disconnection one or more coils making up portion stator winding and any distribution number rotor bar end-ring failures. The approach, based on functions, makes no assumption as necessity sinusoidal MMF therefore include all space harmonics machine. Simulation experimental results confirm validity proposed method.< <ETX...

A surface permanent-magnet vernier machine (SPMVM) has a toothed-pole structure, and its highly nonlinear relationship between dimensions magnetic field makes design cumbersome. This paper presents generic methodology for the which brings out torque-maximizing structure in convenient manner. Various suggestions concerning of SPMVM are also set forth.

A new on-line dead-time compensation technique for low-cost open-loop pulsewidth modulation voltage-source inverter (PWM-VSI) drives is presented. Because of the growing numbers operating in low-speed region, synthesis accurate output voltages has become an important issue where implementation plays role. The so-called average techniques rely on two basic parameters to compensate this effect: magnitude volt seconds lost during each PWM cycle and direction current. In a implementation, it...

In this paper, the overmodulation region voltage-gain characteristics and waveform quality of carrier-based pulsewidth-modulated (PWM) methods are investigated. Through detailed analytical study, extracted independent carrier frequency. The influence blanking time minimum pulsewidth (MPW) control on inverter gain studied shown to be significant. A comparative evaluation modulator reveals advantageous high-modulation-range discontinuous PWM and, in particular, superior performance a method....

A new type of doubly salient machine is presented in which the field excitation provided by nonrotating permanent magnets. This magnet (DSPM) motor shown to be kindred square waveform brushless DC motors. Linear and nonlinear analyses are made investigate characteristics this PM motor. prototype DSPM designed comparisons between induction It that fully exploiting modern high energy material structure, can offer superior performance over existing motors terms efficiency, torque density,...

Vernier permanent-magnet (VPM) machines are well known for high torque density but low power factor. This paper deals with the factor of VPM machines. The goal is not obtained by reducing electrical loading or adjusting current advance angle proposing a novel vernier topology, i.e., dual-stator spoke-array (DSSA) topology. In this paper, characteristics DSSA such as active part, auxiliary mechanical structure, and rotor anisotropy, analyzed in detail. Performances evaluated based on...

The recent increase of bearing damage in induction machines driven by transistorized inverters has spurred activity on possible causes related to PWM inverters. This paper looks into a typical power conversion system from this perspective. It identifies the existence common mode voltages produced all types converters. A hypothesis is then proposed explain current problem. In particular, it shown that an inverter-motor generated inverter, which are attributed switching harmonics, couple...

In this paper, the back electromotive force and power equations of a permanent-magnet (PM) vernier motor are accurately derived considering an air-gap permeance function expressed in terms practical machine dimensions. Using these equations, nature PM is analytically surveyed, substantial information such as main geometric factors affecting torque maximally obtainable for given current provided, leading to new relation per volume. addition, provide means determine slot pole combinations...

This paper presents an active solution to a common-mode voltage created by typical three-phase inverters. It is shown that the addition of fourth leg bridge inverter eliminates ground modulation inverter. An appropriate four-phase LC filter inserted between and load in order create sinusoidal output line-to-line voltage. A simple modification strategy implemented for achieve wye-output neutral-to-ground which equal zero at all times ideal The thereby completely potential produced traditional...

Although design of induction motor drives employing field-oriented control has reached a relatively mature state, little effort been expended on improving the reliability these drives. A new, improved drive topology and strategy are proposed that allow for continuous, disturbance-free operation even with complete loss one leg inverter or phase. analysis computer simulation circuit concepts is included.< <ETX xmlns:mml="http://www.w3.org/1998/Math/MathML"...

A new type of doubly salient machine is presented in which the field excitation provided by a nonrotating permanent magnet (PM). This PM (DSPM) motor shown to be kindred square waveform brushless DC motors. Linear and nonlinear analysis has been performed investigate characteristics this prototype DSPM designed, comparison made between induction motor. It that, fully exploiting modern high-energy material structure, can offer superior performance over existing motors terms efficiency, torque...

Although design of induction motor drives employing field oriented control has reached a relatively mature state, little effort been directed toward improving the reliability these drives. In this paper, new, improved strategy is proposed incorporating multiphase machine that allows for continuous, disturbance-free operation drive even with complete loss one (or more) legs inverter or phase. A analysis both an phase and odd utilizing new circuit concept included.< <ETX...