EPE Association: EPE 1989 - 18 - Lecture Session 3.1: SIGNAL PROCESSING

EPE 1989 - 18 - Lecture Session 3.1: SIGNAL PROCESSING
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   DIGITAL FIELD ORIENTED CONTROL OF A PM SYNCHRONOUS ACTUATOR WITHOUT CURRENT SENSORS
By H. Buyse; Th. Canon; J. Ph. Conard; F. Labrique; P. Sente [View]
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Abstract: This paper describes a field oriented control system suited for PM synchronous actuators with surface mounted rare earth permanent magnets. The main feature of the system consists in the achievement of the field oriented control without current sensing in the armature windings. Moreover, the organization of the controller around two 8 bits microprocessors results in a purely digital generation of the PWM control signals for the voltage source inverter feeding the motor. Comparison with the classical solution using current sensors shows the good static and dynamic performances of the system. Experimental results confirm the theoretical results.

   FIELD-ORIENTED CONTROLLED ASYNCHRONOUS MOTOR WITH IMPROVED TIME RESPONSE BY FREQUENCY ADAPTION
By H. König; P.-K. Budig [View]
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Abstract: The independent control of torque and flux of the asynchronous motor (ASM) is made using the components of the stator voltage. The investigation of the realization of voltages and currents of a sin-modulated transistor-pulse-inverter leads to the adaption of pulse-frequency regime. Thus an increase of the apparent power of the inverter is achieved. At the same time the voltage control is linearized. This was the basic of a high-value speed control for a wide speed range.

   COMPARISON OF DIFFERENT FIELD ORIENTED CONTROL METHODS FOR AN INDUCTION MACHINE FED BY A PWM-MODULATOR CONTROLLED INVERTER
By J. Fetz; D. Horstmann [View]
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Abstract: Different methods for field oriented control of an induction machine are presented. The voltage source inverter supplying the motor is controlled by a PWM-modulator working in the modes of free running and synchronized, sinusoidal modulation, optimized modulation and fundamental switching (van der Broeck, 1986; Stanke, 1987). The superimposed machine control requires the speed, two phase currents of the machine and the dc-link voltage as input quantities. Speed and currents are used in a machine model to compute current and voltage components in a field oriented reference frame (Leonhard, 1983; Horstmann, 1988). The whole control including the PWM-modulator is performed by a single 16-bit-microcomputer. It is possible to change the control modes (feed forward control / closed loop control) during machine operation via software switches. Measurements on a 30 kW test drive show, that a very good steady state and dynamic behaviour of the drive can be achieved even at low speeds.

   ON-LINE ADAPTIVE AND SELFTUNING CONTROL FOR COMPLEX ELECTRICAL DRIVE SYSTEMS
By A. Brickwedde [View]
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Abstract: On-line adaptive control is investigated. The identification is carried out with the help of the Recursive Least Squares Algorithm (RLS-) and the controller adaptation is based on a Pole-Assignment strategy. Emphasis was put on the realization of the scheme on a microprocessor-system and the implementation to control the speed and position of a complex electrical drive system with poorly damped or even unstable and variable resonant load characteristics. A fourth order system with up to six unknown parameters had to be identified and controlled. Besides the identificatlon and controtler adaptation, monitoring strategies had to be implemented, to evaluate the quality of the parameter identification and new controller settings in order to avoid instabilities because of disturbances or insufficient excitabion; the latter one is especially of importance if adaptive control is carried out in closed loop systems and without additional test signals. Experimental results, showing the on-line adaptive control perfomance of a 40 kW DC-drive with changing load characteristics are presented.

EPE 1989 - 18 - Lecture Session 3.1: SIGNAL PROCESSING
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1989 - Conference > EPE 1989 - 18 - Lecture Session 3.1: SIGNAL PROCESSING
	[return to parent folder]

	DIGITAL FIELD ORIENTED CONTROL OF A PM SYNCHRONOUS ACTUATOR WITHOUT CURRENT SENSORS By H. Buyse; Th. Canon; J. Ph. Conard; F. Labrique; P. Sente	[View] [Download]
Abstract: This paper describes a field oriented control system suited for PM synchronous actuators with surface mounted rare earth permanent magnets. The main feature of the system consists in the achievement of the field oriented control without current sensing in the armature windings. Moreover, the organization of the controller around two 8 bits microprocessors results in a purely digital generation of the PWM control signals for the voltage source inverter feeding the motor. Comparison with the classical solution using current sensors shows the good static and dynamic performances of the system. Experimental results confirm the theoretical results.

	FIELD-ORIENTED CONTROLLED ASYNCHRONOUS MOTOR WITH IMPROVED TIME RESPONSE BY FREQUENCY ADAPTION By H. König; P.-K. Budig	[View] [Download]
Abstract: The independent control of torque and flux of the asynchronous motor (ASM) is made using the components of the stator voltage. The investigation of the realization of voltages and currents of a sin-modulated transistor-pulse-inverter leads to the adaption of pulse-frequency regime. Thus an increase of the apparent power of the inverter is achieved. At the same time the voltage control is linearized. This was the basic of a high-value speed control for a wide speed range.

	COMPARISON OF DIFFERENT FIELD ORIENTED CONTROL METHODS FOR AN INDUCTION MACHINE FED BY A PWM-MODULATOR CONTROLLED INVERTER By J. Fetz; D. Horstmann	[View] [Download]
Abstract: Different methods for field oriented control of an induction machine are presented. The voltage source inverter supplying the motor is controlled by a PWM-modulator working in the modes of free running and synchronized, sinusoidal modulation, optimized modulation and fundamental switching (van der Broeck, 1986; Stanke, 1987). The superimposed machine control requires the speed, two phase currents of the machine and the dc-link voltage as input quantities. Speed and currents are used in a machine model to compute current and voltage components in a field oriented reference frame (Leonhard, 1983; Horstmann, 1988). The whole control including the PWM-modulator is performed by a single 16-bit-microcomputer. It is possible to change the control modes (feed forward control / closed loop control) during machine operation via software switches. Measurements on a 30 kW test drive show, that a very good steady state and dynamic behaviour of the drive can be achieved even at low speeds.

	ON-LINE ADAPTIVE AND SELFTUNING CONTROL FOR COMPLEX ELECTRICAL DRIVE SYSTEMS By A. Brickwedde	[View] [Download]
Abstract: On-line adaptive control is investigated. The identification is carried out with the help of the Recursive Least Squares Algorithm (RLS-) and the controller adaptation is based on a Pole-Assignment strategy. Emphasis was put on the realization of the scheme on a microprocessor-system and the implementation to control the speed and position of a complex electrical drive system with poorly damped or even unstable and variable resonant load characteristics. A fourth order system with up to six unknown parameters had to be identified and controlled. Besides the identificatlon and controtler adaptation, monitoring strategies had to be implemented, to evaluate the quality of the parameter identification and new controller settings in order to avoid instabilities because of disturbances or insufficient excitabion; the latter one is especially of importance if adaptive control is carried out in closed loop systems and without additional test signals. Experimental results, showing the on-line adaptive control perfomance of a 40 kW DC-drive with changing load characteristics are presented.