EPE Association: EPE 1997 â€“ 64: Dialogue Session DS5c: LINEAR DRIVES

EPE 1997 â€“ 64: Dialogue Session DS5c: LINEAR DRIVES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 â€“ 64: Dialogue Session DS5c: LINEAR DRIVES

   [return to parent folder]

   AUTOMATIC CONTROL OF A VEHICLE WITH LINEAR INDUCTION MOTOR
By L. Costa; J. Esteves; P. Verdelho; C. Cabrita [View]
[Download]

Abstract: This paper deals with the study and the implementation of a speed and position control system for the automatic operation of an electrical traction vehicle in a people mover system. Two linear induction motors feed by an IGBT PWM voltage inverter with a V/f controller achieve vehicle propulsion. Two control solutions are analysed in the paper: a classical controller PID and a fuzzy logic controller.

   Feasibility of Non-contacting Conveyance System for a Steel Plate using Normal and Thrust Force of Linear Induction Motors
By H. Hayashiya; T. Katayama; H. Ohsaki; E. Masada [View]
[Download]

Abstract: To improve the surface quality of the steel plate, non-contacting conveyance method using electromagnetic force has been investigated. The non-contacting conveyance system consists of electromagnets for propulsion and linear induction motors (LIMs) for levitation. In this system, however, a lot of electromagnets have to be controlled to realize stable levitation of a steel plate. In t'his paper, first of all, the design of supporting system for a practical steel plate conveyance is performed. To make the non-contacting conveyance system simple, the non-contacting conveyance system which utilizes not only thrust force of a LIM for propulsion but also normal force for levitation is proposed. The LIM for steel plate conveyance system is designed by taking the influence of magnetic saturation into account and the levitation system by LIMs is compared with the system by electromagnets.

   MICROCONTROLLER OPTIMAL IMPLEMENTATION OF A NEURAL NETWORK POSITION ESTIMATOR FOR A VARIABLE RELUCTANCE LINEAR ACTUATOR
By S. Cincotti; M. Marchesi; A. Serri [View]
[Download]

Abstract: A sensorless control for a variable reluctance linear actuator implemented on a lowcost microcontroller (MCU) is presented. The motor position estimator is implemented by an artificial neural network (ANN) properly trained. The ANN estimates the motor position by measuring the ripple in the motor phase during chopping-mode supply. The feasibility of the position estimator is preliminary assessed by using a simplified mathematical model of the motor. Then, the neural design is adapted to fit experimental measures of the motor behavior. Finally, the ANN design is optimized for the 8-bit fixed point arithmetic of the MCU. To obtain faster implementation of the ANN, discrete optimization of weight values is constrained to sum-of-power-of-two in order to convert multiplication into shift and add operations. Sigmoid outputs are obtained by a fast look-up table. Numerical and experimental results are presented to evaluate the sensorless drive behavior.

   EXPERIMENTAL DEVICE OF LONG STATOR LSM WITH DISCONTINUOUS ARRANGEMENT AND RESULT
By K. Seki; M. Watada; S. Torii; D. Ebihara [View]
[Download]

Abstract: In the field of the factory automation, transportation system is demanded for the reduction of the labor in large-scale factories. The system is needed for high speed operation and large capacity. Linear synchronous motor (LSM) is suitable for the long stroke transportation system, because the motor is able to produce large thrust force and applicable to high speed operation. Stator of LSM is usually arranged continuously. Authors proposed a new system, which have the primary of the LSM discontinuously located at the necessary points of the acceleration and deceleration. Authors are studying about the technological problems of the system. This paper reports the concepts of the discontinuously arranged LSM system, specification of the experimental device and the results of the experiments. One of the solution of the synchronization is obtained from the experiments.

   VECTORIAL CONTROL OF THE LINEAR ASYNCHRONOUS MACHINES
By G. Gentile; S. Meo; A. Ometto; N. Rotondale; M. Scarano [View]
[Download]

Abstract: The proposed control represents a generalisation of the oriented flux strategy, generally adopted in the field of the rotating induction machines. Aim of the paper is to verify the theoretical feasibility of a vectorial control of the LIM, able to take into account the end-effects.

   CONTROL OF SPECIAL PURPOSE LINEAR DRIVES
By J. Laugis; T. Lehtla [View]
[Download]

Abstract: This paper discusses special purpose linear drives. The speciality of these linear drives is the large air gap of machines. Therefore the heat losses are also relatively high. Commonly, in electrical devices, suchÂ· as power converters, transmission lines, electrical machines, heat losses are undesired and cut down the efficiency of energy consumption. However, in some applications, energy conversion can be considered as multi purpose and the converted thermal energy as useful. For example, in the magnetohydrodynamical (MHD) machines, which work under high temperature conditions, the energy losses in the electrical to mechanical conversion process can be used for the rated temperature maintenance. A similar task can be solved for a linear motor based transportation system used in the casting industry. Here, higher temperature guarantees the quality of the casting process. In addition, temperature regulation or automatic control can be used.

EPE 1997 â€“ 64: Dialogue Session DS5c: LINEAR DRIVES
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 â€“ 64: Dialogue Session DS5c: LINEAR DRIVES
	[return to parent folder]

	AUTOMATIC CONTROL OF A VEHICLE WITH LINEAR INDUCTION MOTOR By L. Costa; J. Esteves; P. Verdelho; C. Cabrita	[View] [Download]
Abstract: This paper deals with the study and the implementation of a speed and position control system for the automatic operation of an electrical traction vehicle in a people mover system. Two linear induction motors feed by an IGBT PWM voltage inverter with a V/f controller achieve vehicle propulsion. Two control solutions are analysed in the paper: a classical controller PID and a fuzzy logic controller.

	Feasibility of Non-contacting Conveyance System for a Steel Plate using Normal and Thrust Force of Linear Induction Motors By H. Hayashiya; T. Katayama; H. Ohsaki; E. Masada	[View] [Download]
Abstract: To improve the surface quality of the steel plate, non-contacting conveyance method using electromagnetic force has been investigated. The non-contacting conveyance system consists of electromagnets for propulsion and linear induction motors (LIMs) for levitation. In this system, however, a lot of electromagnets have to be controlled to realize stable levitation of a steel plate. In t'his paper, first of all, the design of supporting system for a practical steel plate conveyance is performed. To make the non-contacting conveyance system simple, the non-contacting conveyance system which utilizes not only thrust force of a LIM for propulsion but also normal force for levitation is proposed. The LIM for steel plate conveyance system is designed by taking the influence of magnetic saturation into account and the levitation system by LIMs is compared with the system by electromagnets.

	MICROCONTROLLER OPTIMAL IMPLEMENTATION OF A NEURAL NETWORK POSITION ESTIMATOR FOR A VARIABLE RELUCTANCE LINEAR ACTUATOR By S. Cincotti; M. Marchesi; A. Serri	[View] [Download]
Abstract: A sensorless control for a variable reluctance linear actuator implemented on a lowcost microcontroller (MCU) is presented. The motor position estimator is implemented by an artificial neural network (ANN) properly trained. The ANN estimates the motor position by measuring the ripple in the motor phase during chopping-mode supply. The feasibility of the position estimator is preliminary assessed by using a simplified mathematical model of the motor. Then, the neural design is adapted to fit experimental measures of the motor behavior. Finally, the ANN design is optimized for the 8-bit fixed point arithmetic of the MCU. To obtain faster implementation of the ANN, discrete optimization of weight values is constrained to sum-of-power-of-two in order to convert multiplication into shift and add operations. Sigmoid outputs are obtained by a fast look-up table. Numerical and experimental results are presented to evaluate the sensorless drive behavior.

	EXPERIMENTAL DEVICE OF LONG STATOR LSM WITH DISCONTINUOUS ARRANGEMENT AND RESULT By K. Seki; M. Watada; S. Torii; D. Ebihara	[View] [Download]
Abstract: In the field of the factory automation, transportation system is demanded for the reduction of the labor in large-scale factories. The system is needed for high speed operation and large capacity. Linear synchronous motor (LSM) is suitable for the long stroke transportation system, because the motor is able to produce large thrust force and applicable to high speed operation. Stator of LSM is usually arranged continuously. Authors proposed a new system, which have the primary of the LSM discontinuously located at the necessary points of the acceleration and deceleration. Authors are studying about the technological problems of the system. This paper reports the concepts of the discontinuously arranged LSM system, specification of the experimental device and the results of the experiments. One of the solution of the synchronization is obtained from the experiments.

	VECTORIAL CONTROL OF THE LINEAR ASYNCHRONOUS MACHINES By G. Gentile; S. Meo; A. Ometto; N. Rotondale; M. Scarano	[View] [Download]
Abstract: The proposed control represents a generalisation of the oriented flux strategy, generally adopted in the field of the rotating induction machines. Aim of the paper is to verify the theoretical feasibility of a vectorial control of the LIM, able to take into account the end-effects.

	CONTROL OF SPECIAL PURPOSE LINEAR DRIVES By J. Laugis; T. Lehtla	[View] [Download]
Abstract: This paper discusses special purpose linear drives. The speciality of these linear drives is the large air gap of machines. Therefore the heat losses are also relatively high. Commonly, in electrical devices, suchÂ· as power converters, transmission lines, electrical machines, heat losses are undesired and cut down the efficiency of energy consumption. However, in some applications, energy conversion can be considered as multi purpose and the converted thermal energy as useful. For example, in the magnetohydrodynamical (MHD) machines, which work under high temperature conditions, the energy losses in the electrical to mechanical conversion process can be used for the rated temperature maintenance. A similar task can be solved for a linear motor based transportation system used in the casting industry. Here, higher temperature guarantees the quality of the casting process. In addition, temperature regulation or automatic control can be used.