EPE Association: EPE 1991 - 11 - Session 1.11: TRANSPUTERS AND DSP

EPE 1991 - 11 - Session 1.11: TRANSPUTERS AND DSP
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   THE TRANSPUTER CONTROL OF VARIABLE SPEED INDUCTION MOTOR DRIVES
By C. K. P. Luk; M. G. Jayne; D. Rees [View]
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Abstract: The results of an initial investigation into the application of the transputer to the control of a 2.2 kW 4-pole 3-phase induction motor are presented. A novel method has been developed for the generation of a 3-phase pulse-width modulated (PWM) waveform in real-time by virtue of the fast computing speed of the transputer. Experimental results on the generation of the PWM waveforms and a 'soft-start' process for the induction motor are also included. The results of a simulation study of the motor shows the necessity of the 'soft-start' process. The limitations of the transputer drive system and further developments of the present work are discussed.

   A DEVELOPMENT SYSTEM FOR HIGH PERFORMANCE CONTROLLERS FOR AC DRIVES USING TRANSPUTERS AND PARALLEL PROCESSING
By M. R. Webster; D. C. Levy; R. G. Harley; D. R. Woodward [View]
[Download]

Abstract: This paper describes a Motion Control Development System (MCDS) for a transputer-based programmable controller which provides a powerful, flexible and easy-to-use engineering tool to enable the design, implementation and verification of high performance motion control strategies and systems to be incorporated under a single development environment. The paper presents the functional specifications for the development system and discusses some of the software and hardware related issues/features to enable the system to achieve high performance real-time operation in a hierarchical or distributed control environment.

   TRANSPUTERS CONTROL ASYNCHRONOUS SERVODRIVES
By D. Naunin; S. Beierke; P. Heidrich [View]
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Abstract: A parallel-working multi-transputer network and a parallel-processing software algorithm for a complete digital control of a squirrel cage induction motor will be presented. Practical results for a position controller achieved with a transputer network consisting of three transputers are given. Based on this system different sample ratios for a position cascade controller are compared. Furthermore the dynamic behaviour of position step responses as a function of the complete control cycle time is researched. The control cycle time of the multiple value controller is minimized down to 192 μs. Therefore a new parallel processing field orientated control method using the "prefetch-technique" will be introduced. The real time controller uses the IEEE single floating point format (REAL32).

   3 PHASE DC RESONANT LINK CVCF INVERTER WITH IMPROVED SYNTHESIZED AC VOLTAGE FOR UPS EQUIPMENT
By A. Chibani; M. Nakaoka [View]
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Abstract: This paper describes a digital control system for 3 phase constant voltage constant frequency (CVCF) inverter with high frequency DC resonant link. The control scheme uses the space vector method in order to generate switching patterns for power MOSFETs devices. The HF DC resonant link is used here in order to reduce the output filter size and provide soft switching strategy for power devices. A unique feature of the presented power conversion system is the slightly higher switching frequency (40 kHz or more) which can be adjusted by modifying the DC link resonant frequency and the proposed Pulse Division Strategy (PDS). The control scheme including a repetitive controller based on the output filter model is introduced. The controller provides a waveform improvement of the synthesized alternating voltage. The proposed 3 phase inverter is of particular interest for the realization of conventional UPS system (10-50 kW power range) and also HF link configuration UPS rated in the 5-10 kW power range. Analysis, implementation and simulation results are given.

   DSP-BASED CONTROL OF A PERMANENT MAGNET SYNCHRONOUS MOTOR WITH ESTIMATED SPEED AND ROTOR POSITION
By R. Dhaouadi; N. Mohan [View]
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Abstract: For a Permanent Magnet Synchronous Motor (PMSM) drive system, the instantaneous rotor position is needed to control the stator phase currents and the produced torque. The measured position is used also for position control or to derive the rotor velocity needed for speed control. This is normally achieved by using absolute position encoders or resolvers connected to the motor shaft. In this paper, the removal of this electromechanical sensor is considered. A stochastic filtering technique is presented to estimate the speed and the rotor position by only using measurements of the stator voltages and currents. The estimator is an Extended Kalman Filter algorithm which is suitable to be implemented with a digital signal processor for on-line operation. The laboratory implementation of a four-quadrant torque/speed controlled, sensorless drive system are carried out using the TMS 320C25 digital signal processor (DSP). The practical aspects of implementation are discussed and the experimental results are presented to demonstrate the feasibility of this approach.

   TRANSPUTER BASED DIGITAL CONTROLLER WITH HIGH PERFORMANCE 1/0 AND SVM ASIC FOR AC DRIVES
By R. G. Harley; D. C. Levy; M. R. Webster; D. R. Woodward; B. S. Meyer [View]
[Download]

Abstract: This paper describes two high performance controllers for Field Orientated Control (FOC) of AC motors based on transputers and a commercially available Space Vector Modulation (SVM) ASIC. Future high performance servo drives will incorporate many new features made possible by advanced microprocessor technology. Transputers coupled with ASIC devices can provide high performance control while offering the potential software flexibility attainable from high level language programming. The concepts and design of an Embedded, Programmable High Speed Controller (EPHSC) for AC motor control applications are discussed in the first place. A second controller which forms the basis of the Motion Control Development System (MCDS) and utilises the transputer/ASIC combination is introduced: this controller uses a structure designed to meet the demands of multi-motor control and many other applications and indicates the flexibility possible with the transputer.

EPE 1991 - 11 - Session 1.11: TRANSPUTERS AND DSP
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 1991 - Conference > EPE 1991 - 11 - Session 1.11: TRANSPUTERS AND DSP
	[return to parent folder]

	THE TRANSPUTER CONTROL OF VARIABLE SPEED INDUCTION MOTOR DRIVES By C. K. P. Luk; M. G. Jayne; D. Rees	[View] [Download]
Abstract: The results of an initial investigation into the application of the transputer to the control of a 2.2 kW 4-pole 3-phase induction motor are presented. A novel method has been developed for the generation of a 3-phase pulse-width modulated (PWM) waveform in real-time by virtue of the fast computing speed of the transputer. Experimental results on the generation of the PWM waveforms and a 'soft-start' process for the induction motor are also included. The results of a simulation study of the motor shows the necessity of the 'soft-start' process. The limitations of the transputer drive system and further developments of the present work are discussed.

	A DEVELOPMENT SYSTEM FOR HIGH PERFORMANCE CONTROLLERS FOR AC DRIVES USING TRANSPUTERS AND PARALLEL PROCESSING By M. R. Webster; D. C. Levy; R. G. Harley; D. R. Woodward	[View] [Download]
Abstract: This paper describes a Motion Control Development System (MCDS) for a transputer-based programmable controller which provides a powerful, flexible and easy-to-use engineering tool to enable the design, implementation and verification of high performance motion control strategies and systems to be incorporated under a single development environment. The paper presents the functional specifications for the development system and discusses some of the software and hardware related issues/features to enable the system to achieve high performance real-time operation in a hierarchical or distributed control environment.

	TRANSPUTERS CONTROL ASYNCHRONOUS SERVODRIVES By D. Naunin; S. Beierke; P. Heidrich	[View] [Download]
Abstract: A parallel-working multi-transputer network and a parallel-processing software algorithm for a complete digital control of a squirrel cage induction motor will be presented. Practical results for a position controller achieved with a transputer network consisting of three transputers are given. Based on this system different sample ratios for a position cascade controller are compared. Furthermore the dynamic behaviour of position step responses as a function of the complete control cycle time is researched. The control cycle time of the multiple value controller is minimized down to 192 μs. Therefore a new parallel processing field orientated control method using the "prefetch-technique" will be introduced. The real time controller uses the IEEE single floating point format (REAL32).

	3 PHASE DC RESONANT LINK CVCF INVERTER WITH IMPROVED SYNTHESIZED AC VOLTAGE FOR UPS EQUIPMENT By A. Chibani; M. Nakaoka	[View] [Download]
Abstract: This paper describes a digital control system for 3 phase constant voltage constant frequency (CVCF) inverter with high frequency DC resonant link. The control scheme uses the space vector method in order to generate switching patterns for power MOSFETs devices. The HF DC resonant link is used here in order to reduce the output filter size and provide soft switching strategy for power devices. A unique feature of the presented power conversion system is the slightly higher switching frequency (40 kHz or more) which can be adjusted by modifying the DC link resonant frequency and the proposed Pulse Division Strategy (PDS). The control scheme including a repetitive controller based on the output filter model is introduced. The controller provides a waveform improvement of the synthesized alternating voltage. The proposed 3 phase inverter is of particular interest for the realization of conventional UPS system (10-50 kW power range) and also HF link configuration UPS rated in the 5-10 kW power range. Analysis, implementation and simulation results are given.

	DSP-BASED CONTROL OF A PERMANENT MAGNET SYNCHRONOUS MOTOR WITH ESTIMATED SPEED AND ROTOR POSITION By R. Dhaouadi; N. Mohan	[View] [Download]
Abstract: For a Permanent Magnet Synchronous Motor (PMSM) drive system, the instantaneous rotor position is needed to control the stator phase currents and the produced torque. The measured position is used also for position control or to derive the rotor velocity needed for speed control. This is normally achieved by using absolute position encoders or resolvers connected to the motor shaft. In this paper, the removal of this electromechanical sensor is considered. A stochastic filtering technique is presented to estimate the speed and the rotor position by only using measurements of the stator voltages and currents. The estimator is an Extended Kalman Filter algorithm which is suitable to be implemented with a digital signal processor for on-line operation. The laboratory implementation of a four-quadrant torque/speed controlled, sensorless drive system are carried out using the TMS 320C25 digital signal processor (DSP). The practical aspects of implementation are discussed and the experimental results are presented to demonstrate the feasibility of this approach.

	TRANSPUTER BASED DIGITAL CONTROLLER WITH HIGH PERFORMANCE 1/0 AND SVM ASIC FOR AC DRIVES By R. G. Harley; D. C. Levy; M. R. Webster; D. R. Woodward; B. S. Meyer	[View] [Download]
Abstract: This paper describes two high performance controllers for Field Orientated Control (FOC) of AC motors based on transputers and a commercially available Space Vector Modulation (SVM) ASIC. Future high performance servo drives will incorporate many new features made possible by advanced microprocessor technology. Transputers coupled with ASIC devices can provide high performance control while offering the potential software flexibility attainable from high level language programming. The concepts and design of an Embedded, Programmable High Speed Controller (EPHSC) for AC motor control applications are discussed in the first place. A second controller which forms the basis of the Motion Control Development System (MCDS) and utilises the transputer/ASIC combination is introduced: this controller uses a structure designed to meet the demands of multi-motor control and many other applications and indicates the flexibility possible with the transputer.