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In this paper a speed sensorless ac drive with inverter and output LC filter is proposed. A nonlinear, decoupled field oriented control algorithm with a flux and speed close-loop observer is used. In spite of using LC filter on the inverter output, the sensorless system works precisely. That result are obtained as a result of the appropriate estimation and control system use. The theory, simulation,...
This paper evaluates total loss of an induction motor and a permanent magnetic motor drive system applying two various modulation strategies on each motor, which are the PWM operation and the six-step operation. At first, the loss analysis is implemented based on the theoretical model of an inverter and an induction motor. As a result, when the leakage inductance is less than 25%, the PWM drive should...
The inverter-fed induction motor drive system may become unstable at low frequencies and light load. Taking the inverter-fed five phase induction motor drive system as an example, the small disturbance mathematic model of whole system is deduced, based on small disturbance model of induction motor and switching model of inverter system, the three-dimensional unstable region is presented and discussed...
This paper deals with multiple insulated gate bipolar transistor (IGBTs) open circuit faults detection and localization in a pulse width modulation (PWM) voltage source inverter (VSI) fed induction motor based on a modified slope method. Firstly, a detection algorithm was used to calculate the slope of the current-vector trajectory in complex plan αβ. This algorithm detects the faulty bridge. Second,...
This paper focus on the analysis and design of a dual 3-phase machine. The possibility to adopt different winding configurations is investigated as a degree of freedom for the designer. The various configurations are analyzed under faulty operating conditions. Both 3-phase and 6-phase operation is considered. Experimental tests for each configuration are reported for both no load and under load operations.
The issue of noise emission from electric drives is becoming increasingly important. Motor manufacturers have to comply with certain standards in order to assure the high competitiveness of their products. At the same time, with today's variable speed drives, which are supplied with non-sinusoidal voltages, the issue of noise reduction has become more complex. This is because the influence of additional...
This paper presents a fuzzy logic controller (FLC) based direct torque control of induction motor (IM) drive to reduce the ripple in developed torque and stator flux. First the effect of amplitude of torque hysteresis band on the torque ripple of an IM motor is discussed. Finally, a strategy to reduce the ripple in the developed torque and stator flux is proposed by controlling the amplitude of the...
This work presents the modeling of the dynamics of an electric vehicle (EV). Then, by using a typical driving cycle, the parameters for the motor drive system and other drive train components are determined. The proposed drive system is based on an induction motor being supplied by a 3-level NPC inverter. The speed control is based on a constant V/Hz strategy while the inverter is commanded by a Sinusoidal...
In this paper, a sensorless induction motor (IM) drive using speed observer system is presented. The system includes load torque computation for gear fault detection. Nonlinear control method is adopted for controlling the motor over a wide speed range. An LC filter for smoothing current and voltage waveforms is used at the output of the voltage inverter. The use of filter imposes more building of...
This paper presents a control strategy based application to reduce the acoustic noise caused by a PWM-Controlled Induction Machine Drives. It is a controlled technique and it uses a trapezoidal modulator wave with a variable frequency sinusoidal carrier signal. The technique generates high quality voltages with very few commutations per cycle and is highly efficient in reducing commutation loss and...
In the last decades, fault diagnosis of voltage source inverters has received a lot attention since their application to variable speed drives has become an industrial standard. Recently, some methods have been suggested for open-circuit faults in the switching devices of voltage source inverters. However, most of these methods might not work properly for different working conditions of the motor...
Control systems for the induction motor fed by current source converter based on a multiscalar models are presented in this paper. The topology of current source inverter is shown. Equations of multiscalar model of the induction motor are derived. The multiscalar model is the new approach to the control of induction motor based on DC-link current and rotor flux vector. The speed observer system is...
A number of PWM techniques have been developed in recent times for five-phase voltage source inverters (VSIs), which enable sinusoidal output voltage generation. Relatively little attention has been however paid to the current ripple caused by these PWM methods. This paper investigates stator current ripple (THD), caused by the switching harmonics, for two space vector PWM (SVPWM) techniques that...
This paper is focused on the analysis of the power losses in a common mode (CM) active EMI filter for induction motor drives. The different contributions to the total power losses associated to the active filter are theoretically defined and experimentally evaluated with reference to a given PWM induction motor drive. The single contributions to the total power losses due to each part of the active...
Indirect Stator-Quantities Control (ISC) combines the principle of stator-flux-orientation proven successful in Direct Self Control (DSC) with Pulse-Width Modulation (PWM). High torque dynamics and robust behaviour against input voltage disturbance are achieved in the whole operation range including field-weakening. After careful correction of inverter-voltage errors and dc portions in the stator...
This paper analyses the mathematic model of multiphase induction motor, and the magnetic motive force generated by the harmonic currents. Compared to three phase drives, the multiphase motor drives have the advantage of performances on dead-time effect, common mode voltage, technology of non-sinusoidal source fed and reliability. A universal multi-phase voltage source inverter (VSI) is constructed...
This paper presents a hysteresis based current control PWM named "Hi-PWM”, which has several advantages such as quick response of current, less fluctuation of switching frequency and less harmonic components. In this paper, the analysis of Hi-PWM applied railway traction system is explained. This paper also shows temperature and loss simulation of power device using Hi-PWM and experiment result...
The main goal of the paper is to discuss about usefulness, drawbacks and perspectives of single-phase PWM adjustable speed drives (ASDs) for low-power three-phase induction motors. Their positive impact on energy saving in large-scale residential house appliances is underlined. A great attention is devoted to the problem of generation of current harmonic components, both on the motor-side and on the...
Beginning with the development of the power electronics it was possible to generalize the induction motors, especially those with three phases, both for industry and for domestic appliance. The direct user of the multi-phase induction motor was the electric traction due to its special characteristics: simple and robust in structure, easy to maintain and very reliable. This paper presents the electric...
This paper presents a simple Direct Flux Vector Control with Space Vector Modulation (DFVC-SVM) scheme for induction motor drives. Developed algorithm has several advantages like: simplicity (coordinate transformations, current and flux controller are eliminated), wide speed operation range, good dynamics, low torque ripples, constant switching and low sampling frequency. The DFVC-SVM can be used...
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