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EPE-PEMC 2004 - Topic 07-1: Adjustable speed drive systems
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2004 - Conference > EPE-PEMC 2004 - Topic 07: MOTION CONTROL, ROBOTICS AND ADJUSTABLE SPEED DRIVES > EPE-PEMC 2004 - Topic 07-1: Adjustable speed drive systems
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	A Controller Design Method Of Bilateral Control System   By Toshiaki Tsuji, Kenji Natori, Kouhei Ohnishi	[View]   [Download]
Abstract: A novel controller design method of bilateral control system is described. Control design problem of bilateral control system is not easy since the relationship between controller structure and system role is not clear. Therefore, a new idea of "function" is suggested. System role is devided into several minimum components and it is defined as "function". Hadamard matrix is introduced so as to transform the robot coordinate into function coordinate. Hereby, the controller of bilateral control system is available to be devided into several controllers based on respective functions. Function based controller design makes the controller design problem simple since each function is a minimum component and each controller design is done independently. Furthermore, the relationship between each function and controller is explicit. Experimental results show that very high transparancy bilateral control is achieved with this method.
	A MMRAC Control Applied To Speed Control Of A Three-Phase Induction Motor Without Shaft Encoder   By H. T. Camara, H. Pinheiro, H. L. Hey, J. R. Pinheiro, H. A. Gruendling	[View]   [Download]
Abstract: This paper proposes a Modified Model Reference Adaptive Controller (MMRAC) for a speed sensorless induction motor drive. MMRAC is obtained modifying a Robust Model Reference Adaptive Controller (RMRAC). The MMRAC is used to assure robustness and performance in a wide speed range, including low and zero speed conditions. Experimental results are given to show the effectiveness of the proposed controller.
	A New Optimized Approach For Direct Torque Control Of An Induction Motor Drive   By U. Franke, P. G. Catania, J. Petzoldt	[View]   [Download]
Abstract: This paper presents two different approaches for Direct Torque Control (DTC) of an induction motor drive fed from a three phase voltage source inverter. The control algorithms are computed with the new TriCore TC1775 microcontroller. Advantages and drawbacks of the methods are evaluated and compared. Modulation techniques with fixed and varying switching frequency are used. Differences with respect to effort, precision and calculating time in the controller are presented. It is shown that the proposed optimized approach significantly improves the drive's performance.
	Adaptive Control For Vector-Controlled Induction Motor   By F. Naceri, A. Ramdane	[View]   [Download]
Abstract: A new adaptive control, denoted the Extended Minimal Controller Synthesis (EMCS) algorithm is designed for an induction motor which includes both electrical and mechanical dynamics under the assumptions of linear magnetic circuits. The main motivation of the EMCS control is to enhance the robustness of the MRAC algorithms, i.e. the rejection of bounded effects of rapidly varying external disturbances.
	Adaptive Efficient Control For Switch-Reluctance Drives With DC-DC-Regulator For Inverter Supply   By Alecksey Anuchin, Anton Dianov, Vladimir Kozachenko	[View]   [Download]
Abstract: A design of efficient SRD control with DCDCregulator for inverter supply. Developed DCDC-regultor adaptive current controller, rotor position estimator for accurate phase commutation. Offered new adaptive structure for drive control.
	Asynchronous Cascade Of Minimum Influence On The Supply Network   By R. Jarocha	[View]   [Download]
Abstract: Slip energy recovery induction motor drives are used in high power applications, in which by controlling the slip power a variable speed drive system is provided. The paper presents results of simulation and experimental tests of the influence of an inverter asynchronous cascade on the supply network. A modified cascade system with improved power factor and reduced THD factor of the cascade current, which eliminates disadvantages of the former solution, is also presented.
	Combining Induction And Synchronous Machines In A Seven-Phase Series-Connected Three-Motor Drive   By Martin Jones, Emil Levi	[View]   [Download]
Abstract: Application of inverters with a phase number equal to or greater than five opens up the possibility of independent vector control of two or more ac machines, whose stator multi-phase windings are connected in series. This paper deals with a seven-phase supply system, which allows series connection of three seven-phase machines, thus enabling a saving of two inverter legs when compared to an equivalent three-motor three-phase drive. It is shown that the drive concept is independent of the type of ac machine used and that different types can be freely mixed within the multi-motor drive. Considerations are verified by simulation of a three-motor drive consisting of an induction machine, a synchronous reluctance machine and a permanent magnet synchronous machine.
	Control Of AC Machines With Multi-Frequency Resonant Controller   By Jia Zeng, Xavier Guillaud, Philippe Degobert	[View]   [Download]
Abstract: The resonant controller has been proven effective for AC input current control in the stationary reference frame. In this paper, we introduce a new type of resonant element. Associating this element in series or in parallel, we can creat the resonant controller for multiple frequencies. By using the pole assignment theory, the design of multi-frequency resonant controller becomes easier than that by frequency domain analysis. A criterion polynomial for this approach is given by this paper, with which the designed controller is efficient and robust to the variation of system parameters. The digital realization of the resonant controller is also discussed, and by recalculating coefficients according to the input frequencies, it can perfectly regulate the AC input with variable frequencies. The validity and effectiveness of the proposed approach are verified by simulation and experimental studies.
	Design Of The Mechatronic Components Using Dynamic Emulation Of Mechanical Loads   By Miran Rodic, Karel Jezernik, Mladen Trlep	[View]   [Download]
Abstract: An approach to the dynamic emulation of mechanical loads is presented and analyzed. It can be used for the testing of variable speed and torque drives, where both, linear and non-linear dynamics, can be applied. The experimental system consists of the drive under test (drive machine), which is mechanically connected to the active loading system (load machine). The emulation procedure is performed by the closed-loop calculation of the torque, applied by the load machine, in such a manner that the input/output behavior of the experimental system resembles the one of the drive under test propelling the actual load. A feedback compensation scheme is used, where the input is obtained from the torque observer. The output (model speed) is calculated from the numerical model of the emulated load. The method is simple and requires no torque measurement equipment. Also the influence of the nonlinear dynamics of the experimental system is presented. The applied load machine (BLDC motor) is assumed to be torque-controlled with high precision. An induction motor is used as a drive machine. Algorithms are developed with the use of Matlab/Simulink and experiments are executed with the use of the dSPACE system.
	Direct Torque Control Of Three Phase Induction Motor Using Svpwm With Out Sector And Angle Determination   By Arbind Kumar, B. G. Fernandes, K. Chatterjee	[View]   [Download]
Abstract: This paper presents a new direct torque control technique of three-phase induction motor drive using space vector pulse width modulation that does not require any sector or angle determination. This simplifies the control strategy and also reduces the execution time. The technique to determine the refererence voltage space vector is also simplified and does not require any reference frame transformation. Simulation studies have been carried out for the proposed method and results are compared with conventional method of direct torque control using switching table technique. Results show that the torque, current and flux waveforms are superior to that of conventional direct torque control technique. Though the results of the proposed method are simular to those of conventional space vector pulse width modulation, there is a reduction in computation time.
	DTC-SVM AN Efficient Method For Control Both Induction And PM Synchronous Motor   By Marian P. Kazmierkowski, Marcin Zelechowski, Dariusz Swierczynski	[View]   [Download]
Abstract: This paper presents unified sensorless direct torque control method for voltage inverter – fed AC motors using space vector modulation (DTC-SVM). The control scheme is based on closed torque and flux loops with PI controllers which outputs are interpreted as commanded stator voltage vector components in the stator flux oriented coordinates. It was shown that one control scheme can be applied for induction motor (IM) and permanent magnet synchronous motor (PMSM) drives, with only minor modifications necessary. The principle of operation control method is given and simple approach to controller design is presented and discussed. Simulation and DSP based experimental results illustrate the theoretical considerations are presented.
	Eddy Current Coupling With Slotted Conductor Disc   By Hamideh K. Razavi, Michael Lamperth	[View]   [Download]
Abstract: Eddy current couplings are becoming popular devices for speed and torque control. The Efficiency of these couplings depends on the excitation level; thereupon, the route and density of induced currents can affect it significantly. This paper focuses on the design of a squirrel cage-type coupling disc, which forces eddy currents to flow perpendicular to both the axis of rotation and magnetic field lines. Lorentz force and transmitted torque are consequently optimized. The investigation is performed both numerically and experimentally, of which results are presented for variable air gaps and speeds. A comparison between plain and slotted disk conductors, tested under identical set-ups, demonstrates the effect of the proposed design on torque throughput and efficiency. In addition to this, the influence of number and size of slots and the effect of filling slots with iron are studied by parametric FEA modelling verified by experiments.
	Fuzzy Logic Switching State Selector For Dtc Control Of An Induction Motor Using A Three-Level Inverter.   By X. Del Toro(uk), M. G. Jayne(uk), P. A. Witting(uk), A. Arias(es), J. L. Romeral(es)	[View]   [Download]
Abstract: In Direct Torque Control (DTC) with three-level inverters the voltage selection possibilities are enhanced since more inverter states are available. A control method has been designed where a Fuzzy Logic Controller selects the appropriate switching state instead of applying the conventional DTC table. In the simulation results, the novel system based on Fuzzy Logic shows reduction in torque ripple and harmonic distortion in the stator currents and voltages.
	High Performance Induction Motor Drive Based On Adaptive Variable Structure Control   By E. E. El-Kholy	[View]   [Download]
Abstract: A new approach to control system design for induction motor drive is presented. The control method is based on adaptive variable structure design. The mathematical model of the adaptive variable structure controller based on Genetic algorithm system is presented. The design is simple and easy to be implemented. Simulation and experimental results show that the proposed adaptive variable structure controller provides high performance dynamic characteristics and is robust with regard to change of motor speed and external load disturbance.
	High Performance Regenerative Direct Torque Controlled Induction Motor Drive   By C. P. Reddy, M. V. Aware, A. G. Kothari	[View]   [Download]
Abstract: In variable speed controlled drives, the major concern is about the harmonics injection in the connected power supply network. The front end ac-to-dc converters are modified from un-controlled to controlled mode to achieve the IEEE standards in power quality. This paper presents the comparative analysis of the switch mode rectifiers to be used with direct torque controlled induction motors drives. The aim is to operate the induction motor in all four quadrants, while keeping the input current sinusoidal and in phase with the supply voltage. This entails the design of the power converters for active power only leading to higher efficiency of overall system. The proposed schemes are simulated and verified with the laboratory prototype.
	High Power Medium Voltage Drives - State Of The Art, Challenges And Trends   By R.-D. Klug, M. Tomasic	[View]   [Download]
Abstract: The paper gives an overview over high power me-dium voltage drive inverters in the range between one and one hundred megawatts. First the applications and their key requi-rements are summarized. Then the available power semicon-ductors and the different inverter circuit topologies with their different properties, advantages and drawbacks are presented. The key features are compared and suitable converter types for the applications and industry branches are identified. Finally, future trends of technology, manufacturing and market are out-lined.
	Implementation Of A Dsp-Based Resolver-To-Digital Converter   By Sylvain Chatelet, Yung-Kang Chin	[View]   [Download]
Abstract: Resolvers are widely used sensors for angular position feedback. Used in a digital feedback loop they require a resolver to digital converter (RDC). The digital signal processors (DSP) intended for digital control present constantly increasing computing possibilities and increasing number of integrated fuctions. This paper presents an investigation of the opportunity to implement as much of the converter as possible into a DSP. The paper first reviews the existing RDC methods and the recent publications on the subject. The most relevant methods are then considered to be implemented in both fixed and floating point DSP, and each of them is simulated using MATLAB and SIMULINK. The tracking loop method is implemented in an experimental set-up and the results are presented.
	Influence Of An Oversized Induction Motor On The IGBTs Of A Voltage Source Inverter   By Bertil Braennbacka, Timo Vekara	[View]   [Download]
Abstract: For economical reasons industry and other endusers of motor drives often have easily available – even in their storage – a preferred set of motor types. An oversized motor could provide a solution for future additional power needs in excess of that recommended by the vendos and selected by the designers. This paper describes the influence on the insulated gate bipolar transistors (IGBTs) in a voltage source frequency converter if an oversized induction motor at a partial load is used instead of the rated-sized (or smaller) motor with nominal load. In this study, two frequency converters (105 A and 205 A) and three squirrel-cage induction motors (103 A, 160 A, and 279 A) were first modeled and simulated in the time domain and then measured. The rated current of the oversized motor was 1.36-1.60 times the continuous current of the inverter. It was found out that at the inverters rated current the oversized motor produces such high ripples in the motor current and thus increases the temperature of IGBT modules so much that the lifetime of the IGBTs would noticeably reduce. Therefore, an oversized motor cannot be recommended for the applications where the expected lifetime is several years.
	Input-Output Linearizing And Decoupling Control Of An Induction Motor Drive   By Kanungo Barada Mohanty	[View]   [Download]
Abstract: This paper presents an input-output linearizing and decoupling control scheme for speed control of an induction motor drive. In this scheme, the motor model is linearized, and torque and flux are decoupled by use of nonlinear control along with proportional-cum-integral controllers. The control scheme is implemented and tested in laboratory.
	Instantaneous Power Control Of Induction Machines - Robustness Issues   By T. Summers, R. E. Betz	[View]   [Download]
Abstract: Field Oriented Control (FOD) and more recently Direct Torque Control (DTC) have been the algorithms of choice for high performance induction machine drive systems. Recently a different algorithm based on the concept of controlling the real and imaginary powers in the machine has been proposed. This algorithm is called Instantaneous Power Control (IPC). This paper presents a brief outlay of the IPC algorithm and then will, via simulation and experiment, examine the robustness of IPC to parameter variations. The transient performance of IPC and FOC are experimentally determined under similar parameter uncertainty. The low speed operating limit of IPC is investigated when a phase locked loop based back-emf estimation technique is utilised.
	Linear-Quadratic Optimization For Discrete-Time Load Torque Observer   By Grzegorz Sieklucki, Maciej Tondos	[View]   [Download]
Abstract: The contribution presents the method, one of several possible ones, to be applied in the torque load observers design. The method employs the quadratic discrete-time quality factors theory of linear stationary discrete-time systems.
	Matrix Based Approach To Overall Functionality Description Of Drives   By A. Polic, M. Rodic, K. Jezernik	[View]   [Download]
Abstract: The paper presents event-driven approach to design, simulation and implementation of integrated current control, protection and monitoring functions for three-phase inverter-fed motor. The direct current controller determines the inverter switch state from the current error information with no additional controller and modulator. The drive protection and monitoring is based on the observation of logical control and drive operation critical signals such as heat-sink temperature, DC-link voltage and maximum current. To describe such combination of time and event-driven functionality, drive is considered as discrete-event driven system, which enables a more systematic insight to the control design. A new matrix based approach to the modeling of discrete event systems. Modeling of the structure of discrete event-driven system is based on matrix representation of Petri Nets. The discrete dynamics of such a system is described by transferring the system among its specific discrete states, which is denoted using a combination of algebraic and logic equations. To confirm the proposed approach, simulation and experimental results are presented. The proposed algorithm was implemented on FPGA, which is considered as an alternative to the DSP based implementation. Furthermore, some benefits of the FPGA based implementation are presented.
	New Control For A Synchronous Machine, The Hybrid Control   By J. M. Retif, X. Lin-Shi, A. M. Llor, S. Arnalte	[View]   [Download]
Abstract: In this paper, a hybrid direct torque control taking into account both the states of motor and inverter is presented. In contrast to conventional Direct Torque Control, which is based on the presence of hysteresis controllers and a switching table, the hybrid control uses the formal representation of inverter-machine behavior to determine the optimal switching state and vector application time of voltage source inverter. We will show an application to prove the effectiveness and robustness of this control.
	Non-Linear Adaptive State Feedback Position Control Of An Induction Motor With Unknown Load Torque Incorporating An Adaptive Rotor Flux Estimator Insensitive...   By Mohamed Rashed, Peter Macconnell And Af Stronach	[View]   [Download]
Abstract: An adaptive non-linear state feedback position control scheme of a voltage-fed induction motor has been developed in which the control of torque and flux is decoupled. The inputs to the control algorithm are the reference position, the reference flux, the measured stator currents, the measured rotor position, the estimated rotor flux and estimates of the rotor resistance, stator resistance and load torque, which may vary during operation. The controller outputs are the reference stator voltages in rotor flux rotating reference frame. Accurate knowledge of rotor flux and machine parameters is the key factor in obtaining high performance and high efficiency induction motor drive. The rotor flux is estimated using the induction motor rotor circuit model. Although the estimated rotor flux is insensitive to stator resistance variation it does depend on rotor resistance. A stable Model Reference Adaptive System (MRAS) rotor resistance estimator insensitive to stator resistance variation has been designed. Stable load torque, motor speed and stator resistance MRAS estimators have also been developed. These estimators have been developed to constitute a Multi-Input-Multi-Output (MIMO) decoupled cascade structure control system. This simplifies the design problem of the estimators for stable operation from a MIMO design problem to a Single-Input-Single-Output (SISO) design problem. The continuous, adaptive update of the machine parameters and load torque ensures accurate flux estimation and high performance operation. Simulation and experimental results are presented to verify the stability of the induction motor drive in various operating modes.
	Position Control Of Power Supply Unit For Battery Charge On Autonomous Electric Power Supply System For Vehicles   By Kosuke Yoshiya, Tomohiro Hata, Tsutomu Ohmae	[View]   [Download]
Abstract: In this paper, an autonomous electric power supply system is investigated for battery driven vehicles like mobile robots. The feature of the system is to charge the battery of the vehicle from the power unit with high efficiency and contactless in automatically by using inductive coupling of two cores. Especially, the relational position of both cores is controlled to optimized point to charge with the highest efficiency using the induced voltage as a position feedback signal. The position control method is described and the experimental results are presented to confirm the method.
	Predictive Direct Torque Control Of An Induction Machine   By Jose Rodriguez, Jorge Pontt, Cesar Silva, Patricio Cortes, Ulrich Ammann, Stephan Rees	[View]   [Download]
Abstract: A new control scheme for an induction machine is presented. In this scheme the selection of the switching state of the converter is made by evaluating a quality function considering the torque error and the stator flux error. The quality function is evaluated for each switching state applied to a discrete model of the machine. The switching state that minimizes this function is selected and set for the following sampling period. Simulation results confirm that the proposed control strategy allows for an effective control of speed, torque and flux on an inverter-fed induction machine.
	Reduced Order Extended Luenberger Observer Based Sensorless Vector Control Fed By Matrix Converter With Non-Linearity Modeling   By Kyo-Beum Lee; Frede Blaabjerg	[View]   [Download]
Abstract: This paper presents a new sensorless vector control system for high performance induction motor drives fed by a matrix converter with non-linearity compensation. The nonlinear voltage distortion that is caused by commutation delay and on-state voltage drop in switching device is corrected by a new matrix converter model. Reduced Order Extended Luenberger Observer (ROELO) is employed to bring better response in the whole speed operation range and a method to select the observer gain is presented. Experimental results are shown to illustrate the performance of the proposed system.
	Ride-Through Capability Of A Switched Reluctance Motor During Power Sags   By E. Bassily	[View]   [Download]
Abstract: This paper proposes a convenient approach to provide a ride-through capability to the switched reluctance motor drive which is considered as one of the adjustable speed drives. Among the different approaches used to provide full power (full speed and torque) ride-through which is required by many applications, the reduced speed has been chosen. The existing control strategy has been modified to achieve a higher level of immunity to the disturbances caused by voltage sags. Simulationresults show the advantages of the proposed approach.
	Robust Motion Control - SMC Point Of View   By Asif Sabanovic	[View]   [Download]
Abstract: In this paper the robust motion control systems in the sliding mode framework are discussed. Due to the fact that a motion control system with n d.o.f may be mathematically formulated in a unique way as a system composed of n second order systems, design of such a system may be formulated in a unique way as a requirement that the generalized coordinates must satisfy certain algebraic constraint. Such a formulation leads naturally to sliding mode framework to be applied. In this approach constraint manifolds are selected to coincide with desired constraints on the generalized coordinates. It has been shown that the CMC can be interpreted as a realization of the acceleration controller thus possessing all robust properties of the acceleration controller framework. The possibility to treat both unconstrained motion (the motion without contact with environment) and constrained motion in the same way is shown.
	Robust Speed Control Of PMSM With Neuro And Fuzzy Technique Application   By Tomasz Pajchrowski, Krzysztof Zawirski	[View]   [Download]
Abstract: The paper deals with the problem of robust speed control of permanent magnet synchronous motors (PMSM) servodrives. In the paper two new controller structures were analysed: one based on artificial neural network (ANN) and second based on fuzzy logic technique (FLC). Simulation and laboratory investigation results proved good robustness of the control system against moment of inertia variation
	Sensorless Control Of A PM Synchronous Motor For Rotary Compressor   By K. Y. Cho, S. B. Yang, T. K. Kim, S. M. Park	[View]   [Download]
Abstract: A sensorless control of a PM synchronous motor for single piston rotary compressor is presented. The rotor position is estimated from the d-axis and q-axis current errors between the real system and motor model of the position estimator. The torque pulsation of the single piston rotary compressor is compensated to reduce the speed ripples as well as mechanical vibrations. Proposed sensorless drive provides low speed operation of the compressor for energy savings and low mechanical noises. It also gives high speeds operation by flux weakening control for rapid air-cooling and heating of the heat pump air-conditioners.
	Sensorless Sliding - Mode Cotrol Of PM Synchrounous Machine   By Evgen Urlep, Karel Jezernik, Dejan Kos	[View]   [Download]
Abstract: This paper develops the ideas of speed and flux sensorless sliding - mode control of PM synchronous machine. A sliding - mode observer / controller is proposed in this paper. The convergence of the nonlinear time - varying observer along with the asymptotic stability of the controller is analyzed. Pulse width modulation implementation using sliding - mode concepts is also discussed. The major attention is paid to torque control and then the developed approach utilized for speed control. Special attention is paid in linearization of the power stage. Computer simulations and experiments have been carried out to test the proposed estimation and control algorithm. The experimental results demonstrated high efficiency of the proposed estimation and control method.
	Sliding Mode Control Of Double Star Asynchronous Machine-Two Pwm Inverters Set   By N. Madani, M. F. Benkhoris, C. Millet, R. Ledoeuff	[View]   [Download]
Abstract: The supply of double star AC machine by two voltage PWM inverters ensures a power segmentation on the one hand. On the other hand, it introduces a redundancy into the structure, necessary for applications like the naval propulsion. However, this electrical drive presents disadvantages with stator currents quality which depend directly on the inverter’s control law, phase-shift between the two stars, and stator leakage inductance. The machine model is established based on the vectorial formalism. Only the voltages and currents in the aß plane are related to electromechanical energy conversion. The nonsequential (xy) currents don’t contribute to electromechanical energy conversion and cause losses. Therefore the control of Double Star Asynchronous Machine (DSAM ) has a double objective; better control of torque and minimization of the non sequential currents amplitude. A sliding mode control type appear to answer to these two criteria thanks to the possibility to attract the variable on the sliding surface and to maintain it on this surface. In this paper we will present a decoupled model of a DSAM. And a set of simple surfaces have been chosen for each variable and the associated control laws have been synthesized.
	Sliding Modes In Power Electronics And Motion Control   By Asif Sabanovic	[View]   [Download]
Abstract: In the paper the general approach to motion control systems in the sliding mode framework is discussed in details. It has been shown that, due to the fact that a motion control system with n d.o.f may be mathematically formulated in a unique way as a system composed on n 2 d.o.f systems, design of such a system may be formulated in a unique way as a requirement that the generalized coordinates must satisfy certain algebraic constrain. Such a formulation leads naturally to sliding mode methods to be applied where sliding mode manifolds are selected to coincide with desired constraints on the generalized coordinates. In addition to the above problem the design of full observer for IM based drive is discussed.
	Speed Sensorless Mixed Sensitivity Linear Parameter Variant H8 Control Of The Induction Motor   By Roland Toth, Denes Fodor	[View]   [Download]
Abstract: The paper shows the design of a robust control structure for the speed sensorless vector control of the IM, based on the mixed sensitivity (MS) linear parameter variant (LPV) H‡ control theory. The controller makes possible the direct control of the flux and speed of the motor with torque adaptation in noisy environment. The whole control system is tested by intensive simulations and according to the results it shows good dynamic and robust performance. Implementation issues based on a DSP TMS320F243 development platform are also presented.
	State Feedback-Based Control Of An Induction Motor In A Single Fixed-Point Dsp.   By Andrzej Przybyl, Jerzy Jelonkiewicz	[View]   [Download]
Abstract: The paper proposes a method that simplifies a practical realization of the induction motor control system. The control method is based on a state feedback, which enables the high dynamic response with guaranteed stability. State variables are estimated in a speed-adaptive flux observer. Using the neural networks simplifies such a task considerably and even a cheap DSP can handle it. Additionally, a genetic algorithmbased tuning method for the system was proposed. It selects an optimal gain matrix of the observer as well as an optimal feedback control matrix.
	Torque Sensorless VSS Control For Electric Vehicle   By Karel Jezernik, Evgen Urlep	[View]   [Download]
Abstract: Novel induction motor speed sensorless torque control optimizing both torque response and efficiency is proposed. The control is quite different than the conventional field-oriented or direct torque control [1]. First, the produced torque is explicitly continuous output variable of control. Second, a new rotor flux observer, which allows speed sensorless operation of IM by low and zero speed, was developed. A new stator and rotor flux controller/observer based on continuous sliding mode and Lyapunov theory are developed. The proposed robust control scheme allows a smooth transition into the field weakening region and the full utilization of the inverter current and voltage capability during acceleration or regenerative braking of EV. The drive system including an 18 kW, 4 pole, 120 V battery-powered IM and a 30 kW IGBT inverter has been applied to a pick up truck (EV).
	V-Type Sensorless Field Oriented Control Of Induction Motors For Low Cost Applications   By S. Bolognani, L. Tubiana, M. Zigliotto	[View]   [Download]
Abstract: The paper presents a simple sensorless field oriented control (FOC) for an induction motor drive. The control algorithm is derived from the conventional FOC equations by successive approximations. The control is of the so-called V-type, that is, the references to the voltage inverter are calculated, instead of derived as outputs of the current regulation loops. The problem of the steady state instability, which arises in V-type control, is analysed first, then successful fixed by a proper filtering of stator current measurements. The result is a precise, reliable and low-cost induction motor drive. Implementation hints and experimental results are included in the paper.
	Virtual HF Injection Method For PMSM Rotor Position Determination Acting In Whole Speed Range   By R. Filka, B. Dobrucky, J. Vittek	[View]   [Download]
Abstract: The paper describes a new combined method for determination of PM synchronous motor rotor position. Well known magnetic saliency method is used at zero speed. Then a new developed method, based on virtual hf signal injection, is exploited for low speed range. The special modulation strategy has been proposed form this purpose. Its main idea is to decompose the stator voltage into two fundamental components: the basic low frequency voltage component and virtual high frequency injection component. The second one is assumed as sinusoidal with constant high frequency. This voltage causes the current response, which after subtraction from measured stator current will contain the high frequency component. From this component after filtering it is possible to extract the information about rotor position for the rotating motor.
	Zero Speed Operation Of Speed Sensorless Vector Contolled Induction Motors Based On G - Positive Realness And E1 - Modification Approach   By Masaru Hasegawa, Keiju Matsui	[View]   [Download]
Abstract: This paper proposes a design of a robust adaptove full-order observer based on y-positive realness and €1-modification approach for zero speed operation of sensorless vector controlled induction motors. Stability condition of the adaptive full-order observer is well known according to Popov's hyper-stability criterion. In addition, a design for highly robust flux phase estimation as well as stable speed identification is expected for robust performance of the whole vector control system in low speed region. Firstly, the error system of the adaptive full-order observer is reconsidered in this paper, requirements of adaptive full-order observer with speed identifier are described. Next, in order to satisfy all requirements of the robust adaptive observer, the design of the observer gain based on y-positive real problem and the speed adaptive scheme using €1-modification approach. Finally, feasibility and effectiveness of the proposed design are shown by experimental result of zero speed operation.