EPE Association: EPE 1997 – 66: Dialogue Session DS5e: SPECIAL APPLICATIONS

EPE 1997 – 66: Dialogue Session DS5e: SPECIAL APPLICATIONS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 66: Dialogue Session DS5e: SPECIAL APPLICATIONS

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   A NONLINEAR VIBRATION DAMPING CONTROLLER FOR TWO-MASS-MODEL DRIVE SYSTEMS
By R. Dhaouadi; K. Kubo [View]
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Abstract: This paper presents a nonlinear speed controller for the suppression of mechanical vibrations in two-mass-model elastic systems. The nonlinear controller is designed to proyide an optimum response of the load speed with minimum response time and minimum overshoot when stimulated by step input commands. The control system is based on an outer load speed feedback loop, an inner load speed acceleration feedback loop and a secondary nonlinear negative feedforward path which supplements the torque command. The nonlinear signal is derived from the load speed error and the difference between the motor speed and the load speed. Accordingly, the motor torque is automatically varied in a nonlinear manner to drive the load with a damped response and with no torsional vibrations. The synthesis process of the feedback gains and the nonlinear function is carried out in the phase-plane by specifying a desired phase trajectory which results in a nonlinear differential equation describing the behavior of the system. The simulation results obtained indicate that the proposed nonlinear control system has significant advantages over the equivalent linear system and is very effective for vibration suppression in two-mass-model elastic systems.

   EXPERIMENTAL RESULTS OF AN ELECTRO-HYDROSTATIC ACTUATOR SYSTEM USING SLIDING-MODE POSITION CONTROLLER
By Claudio Barroso; J. António Dente [View]
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Abstract: The paper presents experimental results of position controller for an electrohydrostatic actuator with fixed displacement pump based on the sliding-mode operation. The main task for sliding-mode controller design is to determine an adequate commutation' law, that makes . the system insensive to parameters and load variations. In two recent papers Barroso and Dente [2], [3], a principle of synthesizing a commutation law was presented. The measure of certain state variables, like angular motor and linear piston accelerations and its derivates, put some implementation problems.To overcome these difficulties a simplified commutation law with observers was used, that assures smaller position tracking error. Besides, experimental results show that the system have an nonlinearity produced by the fixed displacement pump. This nonlinearity is due a dead zone in its fluid flow-rotor speed characteristic. However, simulation and experimental results show that the proposed control with simplified commutation law, in spite of this nonlinearity, gives a good performance for regulation and tracking applications.

   A COMPLETE RESOLVER-BASED VELOCITY AND POSITION TRACKING SYSTEM FOR HIGH-PERFORMANCES DRIVES
By R. Teodorescu; E. Rosu; I. Bivol; C. Vasilache; D. Floricau [View]
[Download]

Abstract: The progress from the last years in RDC (resolver-to-digital converter}, has lead to the extensive use of resolvers in industrial applications replacing the expensive and sensitive optical encoders. This paper demonstrates the practicality of using resolvers in conjunction with RES-0 1-P, a new interface board designed and realised at our research department, based on the AD2S83 RDC from Analog Devices. A specialised CAD software for the optimal design of the filters, small signal response settling time and frequency bandwidth is used.

   TESTING OF A SINGLE-SIDED LINEAR INDUCTION MOTOR ON A NEW ROTATING RIG
By E. Pappalardo; A. Picardi [View]
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Abstract: Extensive analysis of a new design of linear induction motor intended as the only motor for a new 'People Mover' mounted on steel wheels is being carried out. This involves finite element analysis in two and three dimensions and the use of a new test rig to provide a series of results from a real machine in a 'laboratory environment'. The motivations for both phases of work are described in this paper and comparative results are given.

   NEW CONTROL METHOD FOR TORUS MOTORS
By Chee W. Lu; Brian J. Chalmers; Sheiighua Huang; Alasdair C. Renfrew [View]
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Abstract: This paper proposes new torque ripple suppression and field weakening techniques for the control of axial-flux surface-magnet bmshless motors. These techniques elitninate the drawbacks of present methods and allow the development of a robust drive control system. The proposed integrated scheme offers superior wide-speed torque control performance. Trondheim Practical implementations verify the feasibility of the proposed scheme which may be applied to other types ofpennanent-magnet machine configurations.

   ANALYSIS OF THYRISTOR COMMUTATION OF SERIES CONVERTER-TYPE MOTOR
By Waclaw Orlewski [View]
[Download]

Abstract: A typical converter type motor requires an application of a choke in an intermediary DC circuit. In this paper the modyfication of synchronous machine excitation winding is proposed, that can simultaneously act as a chok. This winding stabilizes a cun·ent of an inverter and excities afield of machine. Computer analysis was performed to examine the influence of machine parameters on commutatuion conditions during start- up. The results of simulation were checked on the specially constructed bench model. Results of computer analysis as well as dynamical characteristics are presented and the lay-out of this machine is described.

EPE 1997 – 66: Dialogue Session DS5e: SPECIAL APPLICATIONS
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1997 - Conference > EPE 1997 – 66: Dialogue Session DS5e: SPECIAL APPLICATIONS
	[return to parent folder]

	A NONLINEAR VIBRATION DAMPING CONTROLLER FOR TWO-MASS-MODEL DRIVE SYSTEMS By R. Dhaouadi; K. Kubo	[View] [Download]
Abstract: This paper presents a nonlinear speed controller for the suppression of mechanical vibrations in two-mass-model elastic systems. The nonlinear controller is designed to proyide an optimum response of the load speed with minimum response time and minimum overshoot when stimulated by step input commands. The control system is based on an outer load speed feedback loop, an inner load speed acceleration feedback loop and a secondary nonlinear negative feedforward path which supplements the torque command. The nonlinear signal is derived from the load speed error and the difference between the motor speed and the load speed. Accordingly, the motor torque is automatically varied in a nonlinear manner to drive the load with a damped response and with no torsional vibrations. The synthesis process of the feedback gains and the nonlinear function is carried out in the phase-plane by specifying a desired phase trajectory which results in a nonlinear differential equation describing the behavior of the system. The simulation results obtained indicate that the proposed nonlinear control system has significant advantages over the equivalent linear system and is very effective for vibration suppression in two-mass-model elastic systems.

	EXPERIMENTAL RESULTS OF AN ELECTRO-HYDROSTATIC ACTUATOR SYSTEM USING SLIDING-MODE POSITION CONTROLLER By Claudio Barroso; J. António Dente	[View] [Download]
Abstract: The paper presents experimental results of position controller for an electrohydrostatic actuator with fixed displacement pump based on the sliding-mode operation. The main task for sliding-mode controller design is to determine an adequate commutation' law, that makes . the system insensive to parameters and load variations. In two recent papers Barroso and Dente [2], [3], a principle of synthesizing a commutation law was presented. The measure of certain state variables, like angular motor and linear piston accelerations and its derivates, put some implementation problems.To overcome these difficulties a simplified commutation law with observers was used, that assures smaller position tracking error. Besides, experimental results show that the system have an nonlinearity produced by the fixed displacement pump. This nonlinearity is due a dead zone in its fluid flow-rotor speed characteristic. However, simulation and experimental results show that the proposed control with simplified commutation law, in spite of this nonlinearity, gives a good performance for regulation and tracking applications.

	A COMPLETE RESOLVER-BASED VELOCITY AND POSITION TRACKING SYSTEM FOR HIGH-PERFORMANCES DRIVES By R. Teodorescu; E. Rosu; I. Bivol; C. Vasilache; D. Floricau	[View] [Download]
Abstract: The progress from the last years in RDC (resolver-to-digital converter}, has lead to the extensive use of resolvers in industrial applications replacing the expensive and sensitive optical encoders. This paper demonstrates the practicality of using resolvers in conjunction with RES-0 1-P, a new interface board designed and realised at our research department, based on the AD2S83 RDC from Analog Devices. A specialised CAD software for the optimal design of the filters, small signal response settling time and frequency bandwidth is used.

	TESTING OF A SINGLE-SIDED LINEAR INDUCTION MOTOR ON A NEW ROTATING RIG By E. Pappalardo; A. Picardi	[View] [Download]
Abstract: Extensive analysis of a new design of linear induction motor intended as the only motor for a new 'People Mover' mounted on steel wheels is being carried out. This involves finite element analysis in two and three dimensions and the use of a new test rig to provide a series of results from a real machine in a 'laboratory environment'. The motivations for both phases of work are described in this paper and comparative results are given.

	NEW CONTROL METHOD FOR TORUS MOTORS By Chee W. Lu; Brian J. Chalmers; Sheiighua Huang; Alasdair C. Renfrew	[View] [Download]
Abstract: This paper proposes new torque ripple suppression and field weakening techniques for the control of axial-flux surface-magnet bmshless motors. These techniques elitninate the drawbacks of present methods and allow the development of a robust drive control system. The proposed integrated scheme offers superior wide-speed torque control performance. Trondheim Practical implementations verify the feasibility of the proposed scheme which may be applied to other types ofpennanent-magnet machine configurations.

	ANALYSIS OF THYRISTOR COMMUTATION OF SERIES CONVERTER-TYPE MOTOR By Waclaw Orlewski	[View] [Download]
Abstract: A typical converter type motor requires an application of a choke in an intermediary DC circuit. In this paper the modyfication of synchronous machine excitation winding is proposed, that can simultaneously act as a chok. This winding stabilizes a cun·ent of an inverter and excities afield of machine. Computer analysis was performed to examine the influence of machine parameters on commutatuion conditions during start- up. The results of simulation were checked on the specially constructed bench model. Results of computer analysis as well as dynamical characteristics are presented and the lay-out of this machine is described.