EPE Association: EPE 2005 - Topic 11-3 - LS: Advanced drive topics

EPE 2005 - Topic 11-3 - LS: Advanced drive topics
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 11: HIGH PERFORMANCE DRIVES > EPE 2005 - Topic 11-3 - LS: Advanced drive topics

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   Dynamic Torque Control for Switched Reluctances Drives based on a new Online Machine Model
By HILLER Marc [View]
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Abstract: A new control concept for dynamic torque control of switched reluctance drives (SRD) is presented. It is based on a novel machine model that can be calculated online without the need of any additional look-up tables. Due to its mathematical structure the proposed model is suitable for accurate simulations and precise online torque control up to maximum speed. All necessary control parameters can be derived by solving equations in a microcontroller, only. Furthermore the torque control using the proposed machine model is very flexible and self adapting to the variation of external parameters (e.g. the DC-link voltage).

   PWM-synchronised flux position estimator for sensorless motor drive with IM based on FPGA
By SULKOWSKI Waldemar; SAMUELSEN Dag [View]
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Abstract: This article presents a PWM-synchronised flux position estimator implemented with use of FPGA applied to sensorless motor drive with IM. Combining PWM modulator with synchronised analog to digital converters allows for precise current measurement without the glitch effect. The direct information about voltage vectors timing, together with right current and DC-voltage measurements during switching sequence allow for precise current derivative determination with reduced noise and converter nonlinearities. This way the EMF calculation is more precise. The unit has three main tasks: I: Generating the PWM signals, II: Synchronised measurement of the voltages and currents in the machine and converter during each switching sequence, and III: Rotor flux position estimation using zero and active PWM periods (essential in field oriented control of AC motor drive). The measurement and estimation scheme allows for the sensorless speed control and flux estimation algorithms which are further developed to relieve the processor from much of its processing load.

   Sensorless Direct Instantaneous Torque Control for Switched Reluctance Machines
By FUENGWARODSAKUL Nisai; DICK Christian; KRANE Johannes; DE DONCKER Rik; BAUER Stefan [View]
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Abstract: This paper presents a position-sensorless torque controller for Switched Reluctance Machines (SRMs) based on Direct Instantaneous Torque Control (DITC). An indirect position estimation to eliminate the need of the position encoder is developed based on current-flux-linkage method. The current-flux-linkage method has advantages of simplicity and requires less computation time. Therefore, the controller can be implemented with a high control bandwidth. The accuracy of position estimation and effects of estimation errors are studied. The functionality of the developed controller and its performance are investigated and verified by experiments over a wide operating range.

   Speed Sensorless Control of PM synchronous machine using Direct Current Control
By JEZERNIK Karel; URLEP Evgen; POLIČ Ales [View]
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Abstract: In this paper a novel algorithm for torque and speed sensorless PMSM control is described. The PMSM rotor position and speed is acquired using sliding-mode rotor flux observer. Observer is based on the model of the PMSM where the derivation of the estimated stator flux is calculated from measured stator voltage and current. When implementing a multiple-loop control of a drive on a single processor, most of the computational time is devoted to the inner current-control loop calculation and generation of output voltage vectors in order to obtain proper drive current signal. The speed of the current controller and modulator is therefore essential for the performance of the control. Major attention is paid to current control constructed as Direct Current Control using event-driven approach and implemented on FPGA. Event-driving determines the transistor switching pattern directly from the current error logic signals change and is designed using a novel matrix based description of the discrete event systems. It is based on matrix description of Petri Nets, supplemented with a combination of logic and algebraic equations and introduces a kind of state-space description for discrete event systems. The control algorithms designed by proposed approach can be easily implemented on modern FPGA devices, which enable parallel execution of the calculations, comparing to the traditional sequential executions on the DSPs. Instead of traditional coding, the control algorithms are loaded in the form of logical matrices. The approach is utilized for torque/speed control based on the sliding mode rotor flux observer. The results of computer simulations are presented as well as the experimental hardware setup.

EPE 2005 - Topic 11-3 - LS: Advanced drive topics
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 11: HIGH PERFORMANCE DRIVES > EPE 2005 - Topic 11-3 - LS: Advanced drive topics
	[return to parent folder]

	Dynamic Torque Control for Switched Reluctances Drives based on a new Online Machine Model By HILLER Marc	[View] [Download]
Abstract: A new control concept for dynamic torque control of switched reluctance drives (SRD) is presented. It is based on a novel machine model that can be calculated online without the need of any additional look-up tables. Due to its mathematical structure the proposed model is suitable for accurate simulations and precise online torque control up to maximum speed. All necessary control parameters can be derived by solving equations in a microcontroller, only. Furthermore the torque control using the proposed machine model is very flexible and self adapting to the variation of external parameters (e.g. the DC-link voltage).

	PWM-synchronised flux position estimator for sensorless motor drive with IM based on FPGA By SULKOWSKI Waldemar; SAMUELSEN Dag	[View] [Download]
Abstract: This article presents a PWM-synchronised flux position estimator implemented with use of FPGA applied to sensorless motor drive with IM. Combining PWM modulator with synchronised analog to digital converters allows for precise current measurement without the glitch effect. The direct information about voltage vectors timing, together with right current and DC-voltage measurements during switching sequence allow for precise current derivative determination with reduced noise and converter nonlinearities. This way the EMF calculation is more precise. The unit has three main tasks: I: Generating the PWM signals, II: Synchronised measurement of the voltages and currents in the machine and converter during each switching sequence, and III: Rotor flux position estimation using zero and active PWM periods (essential in field oriented control of AC motor drive). The measurement and estimation scheme allows for the sensorless speed control and flux estimation algorithms which are further developed to relieve the processor from much of its processing load.

	Sensorless Direct Instantaneous Torque Control for Switched Reluctance Machines By FUENGWARODSAKUL Nisai; DICK Christian; KRANE Johannes; DE DONCKER Rik; BAUER Stefan	[View] [Download]
Abstract: This paper presents a position-sensorless torque controller for Switched Reluctance Machines (SRMs) based on Direct Instantaneous Torque Control (DITC). An indirect position estimation to eliminate the need of the position encoder is developed based on current-flux-linkage method. The current-flux-linkage method has advantages of simplicity and requires less computation time. Therefore, the controller can be implemented with a high control bandwidth. The accuracy of position estimation and effects of estimation errors are studied. The functionality of the developed controller and its performance are investigated and verified by experiments over a wide operating range.

	Speed Sensorless Control of PM synchronous machine using Direct Current Control By JEZERNIK Karel; URLEP Evgen; POLIČ Ales	[View] [Download]
Abstract: In this paper a novel algorithm for torque and speed sensorless PMSM control is described. The PMSM rotor position and speed is acquired using sliding-mode rotor flux observer. Observer is based on the model of the PMSM where the derivation of the estimated stator flux is calculated from measured stator voltage and current. When implementing a multiple-loop control of a drive on a single processor, most of the computational time is devoted to the inner current-control loop calculation and generation of output voltage vectors in order to obtain proper drive current signal. The speed of the current controller and modulator is therefore essential for the performance of the control. Major attention is paid to current control constructed as Direct Current Control using event-driven approach and implemented on FPGA. Event-driving determines the transistor switching pattern directly from the current error logic signals change and is designed using a novel matrix based description of the discrete event systems. It is based on matrix description of Petri Nets, supplemented with a combination of logic and algebraic equations and introduces a kind of state-space description for discrete event systems. The control algorithms designed by proposed approach can be easily implemented on modern FPGA devices, which enable parallel execution of the calculations, comparing to the traditional sequential executions on the DSPs. Instead of traditional coding, the control algorithms are loaded in the form of logical matrices. The approach is utilized for torque/speed control based on the sliding mode rotor flux observer. The results of computer simulations are presented as well as the experimental hardware setup.