EPE Association: EPE 1989 - 01 - Lecture Session 1.1: SIGNAL PROCESSING

EPE 1989 - 01 - Lecture Session 1.1: SIGNAL PROCESSING
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1989 - Conference > EPE 1989 - 01 - Lecture Session 1.1: SIGNAL PROCESSING

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   UNIVERSAL DIGITAL MOTION CONTROLLER
By M. Stern [View]
[Download]

Abstract: The availability of highly-integrated and powerful microelectronic components enables advantageous drive concepts and new problem solutions to be realized in servo drive technology as well as others. In particular, the large computing capacity of the new RISC and DSP processors allows digitalization to be considered for high-speed regulating circuits, which until now had been built using analogue technology. The powerful CPU's in conjunction with ASIC technology allow complex control and regulating functions to be concentrated into the smallest package. This contribution describes a motor regulation concept combining in one unit the functions of a positioning control system and all regulator cascades of a servo controller. This concentration is made possible by consequent digitalization of all control and regulating functlons. The field coordinate regulator as used permits synchronous motors as well as asynchronous induction motors to be used as controlled units. In the area of converters the new power electrlc components allow improvements towards greater power ratings with shorter switching times. The motor regulator concept presented here contains a large number of interfaces. This takes into account anticipated future needs for interlinkage capability to form extensive automation systems.

   COMPARISON BETWEEN DIFFERENT ADAPTIVE SPEED CONTROLS OF PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVES
By A Tijerina; F. Piriou; A. Razek [View]
[Download]

Abstract: In synchronous motor variable speed drives, the classical controls are constituted of an inner current loop and an external speed loop. These models use a linear model near the operatinq point. Consequently for another operating point the system performance fails. In order to overcome this disadvantage, different adaptive methods can be used for speed control. In the proposed communication, two adaptive methods, for a permanent magnet synchronous motor drive, are compared with a classical control. The first method is based on a preprogrammed gain regulator, the second is a model reference adaptive control (MRAC).

   FAST SPEED CONTROL OF A DRIVE WITH SHAFT TORSION
By U. Wolff [View]
[Download]

Abstract: It is a known problem to optimize a speed control if there is a long shaft and the load can swing against the motor. The requirements of the quality of the control system have increased. Considerations and investigations will be presented with the aim to improve stability without losing rapidity. The inherent limits for the close loop control are described as well as investigations on procedures which are related to the time optimal control. The control of a model drive is implemented with a combination of a microprocessor and a signalprocessor. Questions of the practical realisation will be discussed.

   MEASUREMENTS ON A NEW AC INDUCTION MOTOR CONTROL SYSTEM
By Ragnar Joensson [View]
[Download]

Abstract: This new control system for the AC induction motor is extremely simple. It creates "natural field orientation'' with "decoupling" and "quadrature" at all speeds, thanks to voltage control. Voltage control is considered to give slow response. However, measurement of the transient torque response shows that a standard industrial motor has surprisingly fast response. The response time can be shortened by signal shaping networks. A theoretical comparison with current control is made. Torque linearity and torque ripple is studied. An exact mathematical analysis of the control system is made. The development work has been supported by the National Swedish Board for Technical Development.

   NOVEL CURRENT REGULATORS FOR VSI-PWM INVERTERS
By M. P. Kazmierkowski; M. A. Dzieniakowski; W. Sulkowski [View]
[Download]

Abstract: In the paper two simple control strategies for current regulated VSI-PWM transistor inverters are presented. Both methods are based on space vector approach. As regulators three-level comparators are used. The outputs of the comparators select appropriate inverter output voltage vectors via switching table stored in EPROM. The first regulator works with current components represented in rotated (field oriented) coordinate system (dc-components) and the second one with components represented in a stationary coordinate system (ac-components). The theoretical principle of these regulators are discussed. The simulation and experimental results of comparative study which illustrate performance of the proposed regulators in comparison to the most popular scheme based on two-level histeresis comparators are presented.

EPE 1989 - 01 - Lecture Session 1.1: SIGNAL PROCESSING
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1989 - Conference > EPE 1989 - 01 - Lecture Session 1.1: SIGNAL PROCESSING
	[return to parent folder]

	UNIVERSAL DIGITAL MOTION CONTROLLER By M. Stern	[View] [Download]
Abstract: The availability of highly-integrated and powerful microelectronic components enables advantageous drive concepts and new problem solutions to be realized in servo drive technology as well as others. In particular, the large computing capacity of the new RISC and DSP processors allows digitalization to be considered for high-speed regulating circuits, which until now had been built using analogue technology. The powerful CPU's in conjunction with ASIC technology allow complex control and regulating functions to be concentrated into the smallest package. This contribution describes a motor regulation concept combining in one unit the functions of a positioning control system and all regulator cascades of a servo controller. This concentration is made possible by consequent digitalization of all control and regulating functlons. The field coordinate regulator as used permits synchronous motors as well as asynchronous induction motors to be used as controlled units. In the area of converters the new power electrlc components allow improvements towards greater power ratings with shorter switching times. The motor regulator concept presented here contains a large number of interfaces. This takes into account anticipated future needs for interlinkage capability to form extensive automation systems.

	COMPARISON BETWEEN DIFFERENT ADAPTIVE SPEED CONTROLS OF PERMANENT MAGNET SYNCHRONOUS MOTOR DRIVES By A Tijerina; F. Piriou; A. Razek	[View] [Download]
Abstract: In synchronous motor variable speed drives, the classical controls are constituted of an inner current loop and an external speed loop. These models use a linear model near the operatinq point. Consequently for another operating point the system performance fails. In order to overcome this disadvantage, different adaptive methods can be used for speed control. In the proposed communication, two adaptive methods, for a permanent magnet synchronous motor drive, are compared with a classical control. The first method is based on a preprogrammed gain regulator, the second is a model reference adaptive control (MRAC).

	FAST SPEED CONTROL OF A DRIVE WITH SHAFT TORSION By U. Wolff	[View] [Download]
Abstract: It is a known problem to optimize a speed control if there is a long shaft and the load can swing against the motor. The requirements of the quality of the control system have increased. Considerations and investigations will be presented with the aim to improve stability without losing rapidity. The inherent limits for the close loop control are described as well as investigations on procedures which are related to the time optimal control. The control of a model drive is implemented with a combination of a microprocessor and a signalprocessor. Questions of the practical realisation will be discussed.

	MEASUREMENTS ON A NEW AC INDUCTION MOTOR CONTROL SYSTEM By Ragnar Joensson	[View] [Download]
Abstract: This new control system for the AC induction motor is extremely simple. It creates "natural field orientation'' with "decoupling" and "quadrature" at all speeds, thanks to voltage control. Voltage control is considered to give slow response. However, measurement of the transient torque response shows that a standard industrial motor has surprisingly fast response. The response time can be shortened by signal shaping networks. A theoretical comparison with current control is made. Torque linearity and torque ripple is studied. An exact mathematical analysis of the control system is made. The development work has been supported by the National Swedish Board for Technical Development.

	NOVEL CURRENT REGULATORS FOR VSI-PWM INVERTERS By M. P. Kazmierkowski; M. A. Dzieniakowski; W. Sulkowski	[View] [Download]
Abstract: In the paper two simple control strategies for current regulated VSI-PWM transistor inverters are presented. Both methods are based on space vector approach. As regulators three-level comparators are used. The outputs of the comparators select appropriate inverter output voltage vectors via switching table stored in EPROM. The first regulator works with current components represented in rotated (field oriented) coordinate system (dc-components) and the second one with components represented in a stationary coordinate system (ac-components). The theoretical principle of these regulators are discussed. The simulation and experimental results of comparative study which illustrate performance of the proposed regulators in comparison to the most popular scheme based on two-level histeresis comparators are presented.