EPE Association: EPE 1995 - 43 - Dialogue Session DS5c: Industrial Drives

EPE 1995 - 43 - Dialogue Session DS5c: Industrial Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 43 - Dialogue Session DS5c: Industrial Drives

   [return to parent folder]

   DIRECT TORQUE-CONTROL WITH PREDICTIVE ALGORITHM IN MICROPROCESSORIZED PERMANENT MAGNET DRIVES
By A. Del Pizzo; I. Marongiu; A. Perfetto [View]
[Download]

Abstract: Predictive algorithms are proposed for direct torque-control of synchronous permanent magnet drives. Reference is made to microprocessor-based control systems. By means of a suitable formulation of the machine mathematical model and on the basis of some measured quantities, the average motor torque is evaluated for each sampling interval in correspondence of all the possible inverter modes. The control algorithm selects the states able to yield the minimum deviation between the predicted electromagnetic torque and the reference one. Advantages and limitations of the control strategy are highlighted through the analysis of simulation results in comparison with the ones obtained by using other techniques. Sorne heavy transient operations are investigated and compared.

   PARAMETER SENSITIVITY OF THE KALMAN FILTER APPLIED TO A SENSORLESS SYNCHRONOUS MOTOR DRIVE
By S. Bolognani, M. Zigliotto [View]
[Download]

Abstract: Modern control techniques for Permanent Magnet Synchronous Motor (PMSM) drive include field oriented control without any mechanical shaft sensor. The estimation of the speed and rotor position by an Extended Kalman Filter (EKF) represents an effective solution, and some experimental prototypes have already been carried out. This paper presents the results of an analysis of the sensitivity of the EKF to the electrical parameter variations, that is one of the unresolved problems that still obstructs the way to a widespread industrial application of the technique. In particular, the link among the parameter mismatching and the steady state non-zero values of the EKF innovation quantities have been investigated, and the effectiveness of the analysis has been tested by an extended simulation session.

   New High Performance Vector Controlled AC-Drive with Automatic Energy Optimizer
By P. Thogersen; M. Tonnes; U. Jaeger; S. E. Nielsen [View]
[Download]

Abstract: This paper describes a new Voltage Vector Control scheme developed for AC-drives with improved control performance on open loop speed controlled induction motor drives. Further, new features for automatic energy optimization and commissioning for motor adaptation are developed. A fully digital protection scheme ensures robustness against overload and extemal circuit faults.

   ANALYSIS OF ROTOR FLUX REFERENCE FRAME BY PARTITION OF ITS CONTROL STRUCTURE
By K. Bresnahan; H. Zelaya De La Parra; P.D. Evans [View]
[Download]

Abstract: Field-Oriented control based on Fleming's Law, which describes the interaction force between flux and current, has been developed over the past 20 years or so, enabling an AC motor to achieve a dynamic performance comparable to that of the separately excited (SEPEX) DC motor. This paper presents a break down of Field-oriented control (also referred to as Vector control and Decoupling control) by analysing the practical implementation of rotor flux, rotor speed, rotor flux and speed, and finally rotor flux, rotor speed and electromagnetic torque control. The practical implementation is performed on a 7.5 kW induction motor test rig.

   CONTROLLING THE SYNCHRONOUS RELUCTANCE MACHINE WITHOUT MECHANICAL POSITION FEEDBACK
By M.A. de Rooij; M.J. Case [View]
[Download]

Abstract: A control system for the synchronous reluctance machine is presented. This system is based on machine current and voltage feedback and has no need for any rotor position feedback components. The equivalent circuit model as well as the torque/current relationship of the motor determine the control parameters. The control process is then carried out by means of a transputer. The method bas been experimentally proven on a 5kW machine.

   Fast Torque Control of an IGBT-Inverter-Fed Three-Phase A.C. Drive in the Whole Speed Range - Experimental Results
By Frank Hoffmann; Michael Jänecke [View]
[Download]

Abstract: In this paper a fast torque control for the whole speed range of three-phase a.c. drives fed by fast-switching inverters is presented. It is based on "Indirect Self Control" (ISC) in which the stator flux is controlled in a stator-flux-fixed reference frame. The rise time of torque achieved in the field-weakening range is below the best results published till now, although the inverter is exploited with the greatest possible voltage control factor still using sinusoïdal output voltages. The excellent performance of the control scheme is represented and illustrated by experimental results.

   THE INDIRECT-CONTROLLED DOUBLE FED ASYNCHRONOUS MOTOR FOR VARIABLE-SPEED DRIVES
By D. Lecocq; P. Lataire [View]
[Download]

Abstract: For high power industrial applications requiring high dynamic performance and a large fieldweakening range, the double fed wound rotor asynchronous motor (DFAM) offers an interesting solution. Due to the high flexibility of the DFAM (four degrees of freedom) flux, torque, rotorfrequency and powerfactor can be controlled independently. The observability of the rotorcurrents and the better field distribution of the wound rotor induction motor as compared with cage induction motors, allows for a more precise open loop torque control. This paper describes an indirect vector control strategy for induction motors fed by two IGBT PWM inverters. Experimental results are included.

   TORQUE ESTIMATION AND CONTROL IN PM MOTOR DRIVES
By P.P. Acarnley; C.D. French [View]
[Download]

Abstract: Many permanent magnet motor drives use an open loop form of torque control, based on the assumption that output torque is proportional to current. This paper describes an alternative approach in which a real-time estimate of electromagnetic torque is formed and used to generate phase current references. The torque control method has been implemented using a TMS320C31 digital signal processor, and the paper includes steady-state and transient results.

   DESIGN OF SLIP FREQUENCY DETECTOR WITH IMPROVEMENT ACCURACY FOR INDUCTION MOTOR ROTOR PARAMETERS UPDATING
By R. Beguenane; M. E. H. Benbouzid; G. A. Capolino; C. Ghyselen; H. Schoorens [View]
[Download]

Abstract: An induction motor slip frequency is measured without contact with shaft. The measurement is based on FFT calculation of current line spectrum. The latter contains slots harmonics whose frequencies are proportional with respect to slip frequency. The latter is then deduced by exploiting this phenomenon. It will be show how the accuracy slip frequency measurement can be improved by choosing adequate window for FFT calculation. As application of such detector, it will be propose a new rotor parameters identification. Experimental results with Squirrel Cage Induction Motors driven by PWMVSI confirm the feasibility of the slip frequency detector and rotor parameters identification procedure.

   EFFICIENCY COMPARISON OF ELECTRICAL MOTORS FOR ENERGY OPTIMIZED VARIABLE SPEED LOW POWER AND LOW COST HOUSEHOLD EQUIPMENT
By H. R. Andersen; C. B. Rasmussen; E. Ritchie; J. K. Pedersen [View]
[Download]

Abstract: Most household equipment employs an on/off-controlled, constant speed, single-phase induction motor. This paper studies the possibility of replacing this motor with a variable speed, high efficiency motor, which could be a 3-phase induction motor or a 3-phase permanent magnet motor. A reliable efficiency measurement enables the issue to be evaluated by comparison of 6 comparable 100 [W] motors fed by a VSI PWM DC-link inverter.

   HIGH-PERFORMANCE CONTROL FOR HIGH-POWER INDUCTION MACHINE WITHOUT SPEED-SENSOR: CHOICE AND COMPARISON OF TWO METHODS
By L.-O. Peter-Contesse; M. Pietrzak-David; F. Ben Ammar; B. de Fornel [View]
[Download]

Abstract: The aim of this study is to work out a high-performance control for induction machines without mechanical sensor. The hypothesis of separation of electrical and mechanical modes is taken into acount in relation with the field of application. The conception is made from a carefull study of the solutions proposed in the litterature. Two solutions are selected and tested by numerical simulation of the whole system (converter, machine and control). Both of them provide a good behaviour at low speed as well as steady state than at transient. One of them can provide half of the nominal torque at zero-speed.

   VARIABLE STRUCTURE POSITION CONTROL IN PARALLEL STRUCTURE
By J. Timko; M. Haluskova; J. Haluska [View]
[Download]

Abstract: This paper describes the application of the variable structure control concept for position control of motors, where not only superior regulation is requested but also inferior speed and current regulation is necessary.

   IMPLEMENTATION OF A FUZZY SELF-TUNING CONTROLLER FOR ELECTRICAL DRIVES
By E. Chiricozzi; F. Parasiliti; M.Tursini; D.Q. Zhang [View]
[Download]

Abstract: This paper presents a novel and practical fuzzy gain self-tuning method for Pl controllers based on our former work. The basic idea is to deduce a fuzzy relation between a Pl gain intermediate parameter and a specially defined performance index, then with the fuzzy inference mechanism, PI gains are calculated and tuned. Since the fuzzy tuning mechanism has been incorpotated in a stable binary search structure, the stability of the method is thus guaranteed. The proposed method has been verified through experiments, using the speed control of a PM synchronous motor drive system as testbed. The obtained results show the simplicity and effectiveness of this new method.

   MODULAR VARIABLE SPEED AC DRIVES SYSTEM FOR INDUSTRIAL APPLICATIONS
By U. Link; H.-W. Kranz; E. Neis [View]
[Download]

Abstract: A series of PWM drives has been developed having same characteristics in a power range from 2.2 to 1500 kW. Because of a new modular design different control schemes can be combined with the uniform IGBT power sections. Apart from conventional V/Hz mode an enhanced type of vector control and a servo control version have been made available. User and automation interfaces are identical for all versions of the drives. Access to several systems like e. g. Profibus is available. For process control technology options can be integrated into the drive system.

   A SPEED SENSORLESS SPATIAL VECTOR CONTROLLED INVERTER ADDED AN AUTO-MEASURING FUNCTION
By Y. Ohmori; T. Nakanishi; H. Kobayashi [View]
[Download]

Abstract: A PWM inverter which can control high response variable speed of an induction motor without speed sensor by spatial vector control algorithm was developed. Moreover, the inverter was normally added an automatic measuring function which can measure electrical parameters of the motor and set them into the inverter automatically. Using the above inverter, high response variable speed operation and torque control operation of a general purpose induction motor can be achjieved by some easier adjustments.

   HIGH PERFORMANCE FIELD ORIENTED CONTROL FOR CYCLOCONVERTER FED SYNCHRONOUS MACHINE: FROM THEORY TO APPLICATION
By M. Matuonto; A. Monti [View]
[Download]

Abstract: The application of Field Oriented Control represents a fundamental requirement in the development of AC drives. The best part of the applications, anyway, is dedicated to "small" motors with high speed commutating converters, able to reach extremely good dynamic performances. The implementation on high power drives determines different kinds of problems arising from the difficulty of controlling the converter and the need of dealing with dynamic behaviours typical of large systems. In this paper the authors experience in the development of a high performance drive, composed by a salient pole synchronous motor, fed by a twelve-pulse no-circulating current cycloconverter, is described and the solutions used to solve the main control problems are presented. The implementation aspects on a microprocessor system based on VME-bus architecture and performance results on a 100 kV A prototype are also shown.

   Speed and angular synchronism control of machines with flexibly coupled drives
By Andreas Bannack; Nguyen Hong Ha; Ulrich Riefenstahl [View]
[Download]

Abstract: The subject of the investigation is the control of the accurate synchronism of angle of several drives. Drives with converter-fed asynchronous motors with field-orientation control are studied. The paper describes a state-space controller for flexible multi-mass drives with backlash. Based on the optimized speed controller, a control system for accurate synchronism of angle is described for two drives.

   APPLICATION OF ENCODERLESS VECTOR CONTROL TECHNIQUES IN A MEDIUM PERFORMANCE INDUCTION MOTOR DRIVE
By B. P. Conroy; M. Sumner; T. Alexander [View]
[Download]

Abstract: This paper looks at the application of encoderless vector control in medium performance induction motor drives. In recent publications some attention has been given to methods which utilize adaptive flux observers to identify rotor speed. This paper evaluates some of these techniques with particular focus on their application in a single processor drive.

   SPEED CONTROL IMPROVEMENT BY TORQUE OBSERVER FOR ELECTRICAL DRIVES
By A. Serri [View]
[Download]

Abstract: Torque ripple minimization in electrical drives can be achieved either by improving motor design or by adequate driver control. In high performance drives the instantaneous motor torque control strategy is mandatory and, sometimes, torque ripple may be also compensated by the speed control system. To accomplish that, the classical PI speed control scheme must be improved by adding a feedforward loop using a torque observer. In this paper disturbance observer control strategy is investigated for implementation on electrical drives. This technique can reduce significatively speed fluctuation due to load torque, electromagnetic parasitic torques of the motor and variation of system parameter. Detailed analysis and full simulation results together with various experimental setting up descriptions are presented.

   HIGH PERFORMANCE INDUCTION MACHINE DRIVE FOR A FLYING SHEAR
By R. A. Kranenburg; H. Klaassen; G. Torri; E. Gatti [View]
[Download]

Abstract: A field oriented control algorithm for an induction motor bas been developed and verified on a flexible VMEbus based digital signal processor system and has been transported and adapted to a Motorola 68020 micro processor based system. This was possible due to the processor independent modular programming. The control combined with space vector modulation has been applied to a medium power, IGBT based, induction motor drive system. The actual system performance as applied to a flying shear is presented. It bas been demonstrated that the algorithm could be readily transported from one platform to another. The application to a flying shear shows the excellent performance of an induction motor drive system in an application that was previous reserved principally for direct current drive systems.

   COMPARISON OF INDUCTION MACHINE CONTROL WITH ORIENTATION ON ROTOR FLUX OR ON STATOR FLUX IN A VERY WIDE FIELD WEAKENING REGION
By P. Krafka; A. Bünte; H. Grotstollen [View]
[Download]

Abstract: The steady state torque capability of induction machines in a very wide field weakening region is discussed. Since the machines behaviour is independent of the chosen reference frame, the optimal torque can be achieved with rotor flux oriented control schemes as well as with stator flux oriented control schemes. On the other hand, these two basic control concepts can differ with regard to the dynamic behaviour and the measures that are necessary to achieve the optimum. These effects are compared for a well known rotor flux oriented control with inner current control loop and the stator flux oriented Indirect Torque Control. Furthermore, an extension of the Indirect Torque Control is presented that provides comparable conditions to the rotor flux oriented control in a very wide field weakening region.

   OFFLINE PARAMETER IDENTIFICATION OF AN INVERTER-FED INDUCTION MOTOR AT STANDSTlLL
By A. Bünte; H. Grotstollen [View]
[Download]

Abstract: A method to identify the electrical parameters of a voltage source inverter-fed induction motor at standstill is presented. First, the difference between the reference voltages and the actual voltages caused by the inverter are analysed and the consequences for the identification schemes are discussed. As a result a method is proposed by which the mutual inductance and the other parameters can be determined separately. A special advantage of this scheme is the insensitivity to the voltage errors of the inverter. The consequence is that this identification scheme needs no phase voltage detection and it seems to be a good solution for the commissioning of low cost drives.

   MICROPROCESSOR-BASED SELF-TUNING CONTROL FOR DC MOTOR DRIVE
By T. Orlowska-Kowalska, Cz. T. Kowalski, M. Chlipala [View]
[Download]

Abstract: The paper presents the application of the self-tuning control method for on-line tracking of DC motor. By this technique, the rotor speed of the DC drive can follow any arbitrary trajectory with reduced sensitivity to parameter variations, nonlinear effects and load torque disturbances. The high performance drive system was developed, which is required in the industrial application such as robotics, actuation and manipulation. The experimental rig was developed with help of standard PC computer and fast data acquisition card. The experimental tests were presented.

EPE 1995 - 43 - Dialogue Session DS5c: Industrial Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1995 - Conference > EPE 1995 - 43 - Dialogue Session DS5c: Industrial Drives
	[return to parent folder]

	DIRECT TORQUE-CONTROL WITH PREDICTIVE ALGORITHM IN MICROPROCESSORIZED PERMANENT MAGNET DRIVES By A. Del Pizzo; I. Marongiu; A. Perfetto	[View] [Download]
Abstract: Predictive algorithms are proposed for direct torque-control of synchronous permanent magnet drives. Reference is made to microprocessor-based control systems. By means of a suitable formulation of the machine mathematical model and on the basis of some measured quantities, the average motor torque is evaluated for each sampling interval in correspondence of all the possible inverter modes. The control algorithm selects the states able to yield the minimum deviation between the predicted electromagnetic torque and the reference one. Advantages and limitations of the control strategy are highlighted through the analysis of simulation results in comparison with the ones obtained by using other techniques. Sorne heavy transient operations are investigated and compared.

	PARAMETER SENSITIVITY OF THE KALMAN FILTER APPLIED TO A SENSORLESS SYNCHRONOUS MOTOR DRIVE By S. Bolognani, M. Zigliotto	[View] [Download]
Abstract: Modern control techniques for Permanent Magnet Synchronous Motor (PMSM) drive include field oriented control without any mechanical shaft sensor. The estimation of the speed and rotor position by an Extended Kalman Filter (EKF) represents an effective solution, and some experimental prototypes have already been carried out. This paper presents the results of an analysis of the sensitivity of the EKF to the electrical parameter variations, that is one of the unresolved problems that still obstructs the way to a widespread industrial application of the technique. In particular, the link among the parameter mismatching and the steady state non-zero values of the EKF innovation quantities have been investigated, and the effectiveness of the analysis has been tested by an extended simulation session.

	New High Performance Vector Controlled AC-Drive with Automatic Energy Optimizer By P. Thogersen; M. Tonnes; U. Jaeger; S. E. Nielsen	[View] [Download]
Abstract: This paper describes a new Voltage Vector Control scheme developed for AC-drives with improved control performance on open loop speed controlled induction motor drives. Further, new features for automatic energy optimization and commissioning for motor adaptation are developed. A fully digital protection scheme ensures robustness against overload and extemal circuit faults.

	ANALYSIS OF ROTOR FLUX REFERENCE FRAME BY PARTITION OF ITS CONTROL STRUCTURE By K. Bresnahan; H. Zelaya De La Parra; P.D. Evans	[View] [Download]
Abstract: Field-Oriented control based on Fleming's Law, which describes the interaction force between flux and current, has been developed over the past 20 years or so, enabling an AC motor to achieve a dynamic performance comparable to that of the separately excited (SEPEX) DC motor. This paper presents a break down of Field-oriented control (also referred to as Vector control and Decoupling control) by analysing the practical implementation of rotor flux, rotor speed, rotor flux and speed, and finally rotor flux, rotor speed and electromagnetic torque control. The practical implementation is performed on a 7.5 kW induction motor test rig.

	CONTROLLING THE SYNCHRONOUS RELUCTANCE MACHINE WITHOUT MECHANICAL POSITION FEEDBACK By M.A. de Rooij; M.J. Case	[View] [Download]
Abstract: A control system for the synchronous reluctance machine is presented. This system is based on machine current and voltage feedback and has no need for any rotor position feedback components. The equivalent circuit model as well as the torque/current relationship of the motor determine the control parameters. The control process is then carried out by means of a transputer. The method bas been experimentally proven on a 5kW machine.

	Fast Torque Control of an IGBT-Inverter-Fed Three-Phase A.C. Drive in the Whole Speed Range - Experimental Results By Frank Hoffmann; Michael Jänecke	[View] [Download]
Abstract: In this paper a fast torque control for the whole speed range of three-phase a.c. drives fed by fast-switching inverters is presented. It is based on "Indirect Self Control" (ISC) in which the stator flux is controlled in a stator-flux-fixed reference frame. The rise time of torque achieved in the field-weakening range is below the best results published till now, although the inverter is exploited with the greatest possible voltage control factor still using sinusoïdal output voltages. The excellent performance of the control scheme is represented and illustrated by experimental results.

	THE INDIRECT-CONTROLLED DOUBLE FED ASYNCHRONOUS MOTOR FOR VARIABLE-SPEED DRIVES By D. Lecocq; P. Lataire	[View] [Download]
Abstract: For high power industrial applications requiring high dynamic performance and a large fieldweakening range, the double fed wound rotor asynchronous motor (DFAM) offers an interesting solution. Due to the high flexibility of the DFAM (four degrees of freedom) flux, torque, rotorfrequency and powerfactor can be controlled independently. The observability of the rotorcurrents and the better field distribution of the wound rotor induction motor as compared with cage induction motors, allows for a more precise open loop torque control. This paper describes an indirect vector control strategy for induction motors fed by two IGBT PWM inverters. Experimental results are included.

	TORQUE ESTIMATION AND CONTROL IN PM MOTOR DRIVES By P.P. Acarnley; C.D. French	[View] [Download]
Abstract: Many permanent magnet motor drives use an open loop form of torque control, based on the assumption that output torque is proportional to current. This paper describes an alternative approach in which a real-time estimate of electromagnetic torque is formed and used to generate phase current references. The torque control method has been implemented using a TMS320C31 digital signal processor, and the paper includes steady-state and transient results.

	DESIGN OF SLIP FREQUENCY DETECTOR WITH IMPROVEMENT ACCURACY FOR INDUCTION MOTOR ROTOR PARAMETERS UPDATING By R. Beguenane; M. E. H. Benbouzid; G. A. Capolino; C. Ghyselen; H. Schoorens	[View] [Download]
Abstract: An induction motor slip frequency is measured without contact with shaft. The measurement is based on FFT calculation of current line spectrum. The latter contains slots harmonics whose frequencies are proportional with respect to slip frequency. The latter is then deduced by exploiting this phenomenon. It will be show how the accuracy slip frequency measurement can be improved by choosing adequate window for FFT calculation. As application of such detector, it will be propose a new rotor parameters identification. Experimental results with Squirrel Cage Induction Motors driven by PWMVSI confirm the feasibility of the slip frequency detector and rotor parameters identification procedure.

	EFFICIENCY COMPARISON OF ELECTRICAL MOTORS FOR ENERGY OPTIMIZED VARIABLE SPEED LOW POWER AND LOW COST HOUSEHOLD EQUIPMENT By H. R. Andersen; C. B. Rasmussen; E. Ritchie; J. K. Pedersen	[View] [Download]
Abstract: Most household equipment employs an on/off-controlled, constant speed, single-phase induction motor. This paper studies the possibility of replacing this motor with a variable speed, high efficiency motor, which could be a 3-phase induction motor or a 3-phase permanent magnet motor. A reliable efficiency measurement enables the issue to be evaluated by comparison of 6 comparable 100 [W] motors fed by a VSI PWM DC-link inverter.

	HIGH-PERFORMANCE CONTROL FOR HIGH-POWER INDUCTION MACHINE WITHOUT SPEED-SENSOR: CHOICE AND COMPARISON OF TWO METHODS By L.-O. Peter-Contesse; M. Pietrzak-David; F. Ben Ammar; B. de Fornel	[View] [Download]
Abstract: The aim of this study is to work out a high-performance control for induction machines without mechanical sensor. The hypothesis of separation of electrical and mechanical modes is taken into acount in relation with the field of application. The conception is made from a carefull study of the solutions proposed in the litterature. Two solutions are selected and tested by numerical simulation of the whole system (converter, machine and control). Both of them provide a good behaviour at low speed as well as steady state than at transient. One of them can provide half of the nominal torque at zero-speed.

	VARIABLE STRUCTURE POSITION CONTROL IN PARALLEL STRUCTURE By J. Timko; M. Haluskova; J. Haluska	[View] [Download]
Abstract: This paper describes the application of the variable structure control concept for position control of motors, where not only superior regulation is requested but also inferior speed and current regulation is necessary.

	IMPLEMENTATION OF A FUZZY SELF-TUNING CONTROLLER FOR ELECTRICAL DRIVES By E. Chiricozzi; F. Parasiliti; M.Tursini; D.Q. Zhang	[View] [Download]
Abstract: This paper presents a novel and practical fuzzy gain self-tuning method for Pl controllers based on our former work. The basic idea is to deduce a fuzzy relation between a Pl gain intermediate parameter and a specially defined performance index, then with the fuzzy inference mechanism, PI gains are calculated and tuned. Since the fuzzy tuning mechanism has been incorpotated in a stable binary search structure, the stability of the method is thus guaranteed. The proposed method has been verified through experiments, using the speed control of a PM synchronous motor drive system as testbed. The obtained results show the simplicity and effectiveness of this new method.

	MODULAR VARIABLE SPEED AC DRIVES SYSTEM FOR INDUSTRIAL APPLICATIONS By U. Link; H.-W. Kranz; E. Neis	[View] [Download]
Abstract: A series of PWM drives has been developed having same characteristics in a power range from 2.2 to 1500 kW. Because of a new modular design different control schemes can be combined with the uniform IGBT power sections. Apart from conventional V/Hz mode an enhanced type of vector control and a servo control version have been made available. User and automation interfaces are identical for all versions of the drives. Access to several systems like e. g. Profibus is available. For process control technology options can be integrated into the drive system.

	A SPEED SENSORLESS SPATIAL VECTOR CONTROLLED INVERTER ADDED AN AUTO-MEASURING FUNCTION By Y. Ohmori; T. Nakanishi; H. Kobayashi	[View] [Download]
Abstract: A PWM inverter which can control high response variable speed of an induction motor without speed sensor by spatial vector control algorithm was developed. Moreover, the inverter was normally added an automatic measuring function which can measure electrical parameters of the motor and set them into the inverter automatically. Using the above inverter, high response variable speed operation and torque control operation of a general purpose induction motor can be achjieved by some easier adjustments.

	HIGH PERFORMANCE FIELD ORIENTED CONTROL FOR CYCLOCONVERTER FED SYNCHRONOUS MACHINE: FROM THEORY TO APPLICATION By M. Matuonto; A. Monti	[View] [Download]
Abstract: The application of Field Oriented Control represents a fundamental requirement in the development of AC drives. The best part of the applications, anyway, is dedicated to "small" motors with high speed commutating converters, able to reach extremely good dynamic performances. The implementation on high power drives determines different kinds of problems arising from the difficulty of controlling the converter and the need of dealing with dynamic behaviours typical of large systems. In this paper the authors experience in the development of a high performance drive, composed by a salient pole synchronous motor, fed by a twelve-pulse no-circulating current cycloconverter, is described and the solutions used to solve the main control problems are presented. The implementation aspects on a microprocessor system based on VME-bus architecture and performance results on a 100 kV A prototype are also shown.

	Speed and angular synchronism control of machines with flexibly coupled drives By Andreas Bannack; Nguyen Hong Ha; Ulrich Riefenstahl	[View] [Download]
Abstract: The subject of the investigation is the control of the accurate synchronism of angle of several drives. Drives with converter-fed asynchronous motors with field-orientation control are studied. The paper describes a state-space controller for flexible multi-mass drives with backlash. Based on the optimized speed controller, a control system for accurate synchronism of angle is described for two drives.

	APPLICATION OF ENCODERLESS VECTOR CONTROL TECHNIQUES IN A MEDIUM PERFORMANCE INDUCTION MOTOR DRIVE By B. P. Conroy; M. Sumner; T. Alexander	[View] [Download]
Abstract: This paper looks at the application of encoderless vector control in medium performance induction motor drives. In recent publications some attention has been given to methods which utilize adaptive flux observers to identify rotor speed. This paper evaluates some of these techniques with particular focus on their application in a single processor drive.

	SPEED CONTROL IMPROVEMENT BY TORQUE OBSERVER FOR ELECTRICAL DRIVES By A. Serri	[View] [Download]
Abstract: Torque ripple minimization in electrical drives can be achieved either by improving motor design or by adequate driver control. In high performance drives the instantaneous motor torque control strategy is mandatory and, sometimes, torque ripple may be also compensated by the speed control system. To accomplish that, the classical PI speed control scheme must be improved by adding a feedforward loop using a torque observer. In this paper disturbance observer control strategy is investigated for implementation on electrical drives. This technique can reduce significatively speed fluctuation due to load torque, electromagnetic parasitic torques of the motor and variation of system parameter. Detailed analysis and full simulation results together with various experimental setting up descriptions are presented.

	HIGH PERFORMANCE INDUCTION MACHINE DRIVE FOR A FLYING SHEAR By R. A. Kranenburg; H. Klaassen; G. Torri; E. Gatti	[View] [Download]
Abstract: A field oriented control algorithm for an induction motor bas been developed and verified on a flexible VMEbus based digital signal processor system and has been transported and adapted to a Motorola 68020 micro processor based system. This was possible due to the processor independent modular programming. The control combined with space vector modulation has been applied to a medium power, IGBT based, induction motor drive system. The actual system performance as applied to a flying shear is presented. It bas been demonstrated that the algorithm could be readily transported from one platform to another. The application to a flying shear shows the excellent performance of an induction motor drive system in an application that was previous reserved principally for direct current drive systems.

	COMPARISON OF INDUCTION MACHINE CONTROL WITH ORIENTATION ON ROTOR FLUX OR ON STATOR FLUX IN A VERY WIDE FIELD WEAKENING REGION By P. Krafka; A. Bünte; H. Grotstollen	[View] [Download]
Abstract: The steady state torque capability of induction machines in a very wide field weakening region is discussed. Since the machines behaviour is independent of the chosen reference frame, the optimal torque can be achieved with rotor flux oriented control schemes as well as with stator flux oriented control schemes. On the other hand, these two basic control concepts can differ with regard to the dynamic behaviour and the measures that are necessary to achieve the optimum. These effects are compared for a well known rotor flux oriented control with inner current control loop and the stator flux oriented Indirect Torque Control. Furthermore, an extension of the Indirect Torque Control is presented that provides comparable conditions to the rotor flux oriented control in a very wide field weakening region.

	OFFLINE PARAMETER IDENTIFICATION OF AN INVERTER-FED INDUCTION MOTOR AT STANDSTlLL By A. Bünte; H. Grotstollen	[View] [Download]
Abstract: A method to identify the electrical parameters of a voltage source inverter-fed induction motor at standstill is presented. First, the difference between the reference voltages and the actual voltages caused by the inverter are analysed and the consequences for the identification schemes are discussed. As a result a method is proposed by which the mutual inductance and the other parameters can be determined separately. A special advantage of this scheme is the insensitivity to the voltage errors of the inverter. The consequence is that this identification scheme needs no phase voltage detection and it seems to be a good solution for the commissioning of low cost drives.

	MICROPROCESSOR-BASED SELF-TUNING CONTROL FOR DC MOTOR DRIVE By T. Orlowska-Kowalska, Cz. T. Kowalski, M. Chlipala	[View] [Download]
Abstract: The paper presents the application of the self-tuning control method for on-line tracking of DC motor. By this technique, the rotor speed of the DC drive can follow any arbitrary trajectory with reduced sensitivity to parameter variations, nonlinear effects and load torque disturbances. The high performance drive system was developed, which is required in the industrial application such as robotics, actuation and manipulation. The experimental rig was developed with help of standard PC computer and fast data acquisition card. The experimental tests were presented.