EPE Association: EPE 2005 - Topic 11-4a - DS: High performance drives

EPE 2005 - Topic 11-4a - DS: High performance drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 11: HIGH PERFORMANCE DRIVES > EPE 2005 - Topic 11-4a - DS: High performance drives

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   A New Flux Weakening Operation of Interior Permanent Magnet Synchronous Motors for Railway Vehicle Traction
By Toshifumi Yamakawa; Shinji Wakao; Keiichiro Kondo; Takashi Yoneyama [View]
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Abstract: This paper investigates a new flux-weakening operation of interior permanent magnet synchronous motors for railway vehicle traction. A design method of the controller is also suggested. The control method is verified both numerically and experimentally to ensure that it is feasible enough to be applied to the railway vehicle traction system.

   A Novel Technique to Estimate Rotor Time Constant in Vector Controlled Induction Motor Drives
By CUPERTINO Francesco; BRANISLAV Zigmund; SALVATORE Luigi; MININNO Ernesto [View]
[Download]

Abstract: This paper presents a new technique to estimate the rotor time constant of vector-controlled induction motors (IMs). The estimation is based on the comparison between the expected speed trajectory corresponding to constant acceleration and the actual speed trajectory of the drive. In fact, when the drive operates under vector control with constant torque reference and load, it is expected that the motor has constant acceleration and rectilinear speed trajectory. A simple optimization algorithm, implemented on the same microcontroller used for vector control, updates on-line the rotor time constant trying to minimize the difference between the expected and the actual speed trajectories of the IM. The main advantages of our approach are the complete independence from motor mathematical model, and possibility of implementation on low-cost microcontrollers. Simulation and experimental results are presented to prove the accuracy and the effectiveness of the estimation technique.

   A Robust Method for Flux Weakening Operation of DTC Induction Motor Drive with On-Line Estimation of the Break-Down Torque
By TANI Angelo; ZARRI Luca; SERRA Giovanni; CASADEI Domenico [View]
[Download]

Abstract: A method for the flux weakening operation of DTC induction motor drives is proposed. The flux reference is adjusted on the basis of the torque error, thus determining a spontaneous flux weakening. For implementing this algorithm, it is necessary to estimate the maximum torque that the induction machine is able to generate at any speed. The main features of the proposed system are little dependency on machine parameters and smooth transition into and out of the flux weakening operation mode. Experimental tests demonstrate the effectiveness of the control scheme.

   A Simple DTC-SVM Method for Matrix Converter Drives Using a Flux Deadbeat Scheme
By FREDE Blaabjerg; LEE Ky; LEE Kwan [View]
[Download]

Abstract: In this paper, a simple direct torque control (DTC) method for sensorless matrix converter drives is proposed, which is characterized by a simple structure, minimal torque ripple and unity input power factor. Also a good sensorless speed-control performance in the low speed operation is obtained, while maintaining constant switching frequency and fast torque dynamics. It is possible to combine the advantages of matrix converters with the advantages of the DTC strategy using space vector modulation a deadbeat algorithm in the stator flux reference frame. Experimental results are shown to illustrate the feasibility of the proposed strategy.

   AN EFFICIENT ENERGY CONTROLLER FOR AN INDUCTION MOTOR DRIVE WITH COMPENSATION OF TEMPERATURE USING NEURAL NETWORKS
By PERACAULA Juan; MOREN; PRYYMAK Bogdan [View]
[Download]

Abstract: A Neural Network (NN) Control is used to implement optimal flux in a vector control variable speed drive. A model of the motor losses allows the NN to calculate the flux for a maximum efficiency in each working point of the Induction Motor (IM). Taking into consideration the fact that nominal flux is not necessary for load torques below the rated torque of the IM, losses can be transferred from iron to copper decreasing the real flux and reaching the minimum total losses point. A complex loss model of the motor, including magnetic and thermal deviations of its parameters, is used to estimate losses. This can be useful in many applications where induction motors work below the nominal torque most of the time. To account for iron and copper losses, some inductances and resistances of the IM must be computed. Estimators are implemented for this purpose. Changes in resistance values due to temperature and in inductances due to iron saturation curves are also computed. Algorithms for computing the optimum flux with NN and vector control with this optimum flux were implemented in a DS1102 Controller Board from DSpace. In the sub-system for flux computation the neural network is trained to estimate the optimum rotor flux. Inputs to the NN are torque, speed and estimated rotor resistance of the IM and the output is the rotor flux.

   Current control for the Switched Reluctance Motor with enhanced Performance
By BEKIESCH Joanna; SCHROEDER Guenter [View]
[Download]

Abstract: This paper presents a gain adaptation of the current PI controller with consideration of the variable time constant and an EMF compensation for the nonlinear switched reluctance machine. With this it is possible to minimize the disturbances in the control loop, which are related to the saturation or the back EMF. The compensation for each point of operation is done referring to the actual position, current and speed of the machine. Additionally a short comparison of hysteresis and PI controller is presented.

   Design and Comparison Direct Torque Control Techniques for Induction Motors
By Marcin Zelechowski; Frede Blaabjerg; Marian P. Kazmierkowski; Darius Swierczynski; Wojciech Kolomyjski [View]
[Download]

Abstract: In this paper a comparison of two significant control methods of induction motor are presented. The first one is a classical Direct Torque and Flux Control (DTC) and is compared with a scheme, which uses Space Vector Modulator (DTC-SVM). A comparison in respect to dynamic and steady state performance of the drives is presented. The methods are compared in order to perform the demands from Adjustable Speed Drive (ASD). Simulation and experimental results for both methods are shown.

   Flux sliding mode control of a doubly fed induction machine
By PIETRZA; VIDAL Pau [View]
[Download]

Abstract: This paper presents an original control strategy for Doubly Fed Induction Machine (DFIM) which both stator and rotor circuits are connected to individual Pulse Width Modulation (PWM) voltage source inverters. This configuration reduces the power converters size. We adopt the general Field Oriented Control (FOC) theory to a certain non linear strategy: Variable Struture Control (VSC), called also the Sliding Mode Control. To control the power exchanges between the stator and rotor sides of the machine, the authors adapt a power distribution constraint between the stator and the rotor windings. A flux model is presented and applied to this VSC strategy. The DFIM speed is also guaranteed by a Sliding Mode Control. The quasi-experimental results obtained by SABER software, are presented to validate this control strategy. The VSC robustness is also presented by introducing some DFIM parameters changing.

   Independent Vector Control of Two PM Motors with Five-Leg Inverter by the Expanded Two-Arm Modulation Method
By MATSUSE Kouki; HIZUME Motoki; KIMURA Yuta [View]
[Download]

Abstract: This paper presents an independent vector control of two Permanent magnet (PM) motors with five-leg inverter by the expanded two-arm pulse-width modulation (PWM) method. This PWM method can control independently both PM motors that use the leg connected in common. Simulation results show that the proposed method is effective under various driving conditions.

   New Field-Weakening Control Considering Voltage Saturation for Vector Control System of Induction Motor
By ENDO Ryo; OHISHI Kiyoshi; KANMACHI Toshiyuki [View]
[Download]

Abstract: This paper proposes a new field-weakening control considering inverter voltage saturation for vector controlled induction motor. The proposed method improves the output torque characteristics in the field-weakening region. The effectiveness of proposed method is verified by the numerical simulation results and the experimental results.

   Speed and Torque Control of a Permanent Magnet Excited Transverse Flux Motor for Direct Servo-Drive Applications
By ORLIK Bernd; SCHUeTTLER Jochen; WERNER Uwe [View]
[Download]

Abstract: This paper deals with an innovative method to minimise the cogging torque of transverse flux motors in direct drive applications to achieve an accurate speed control. These approaches are based on calculated optimised current wave forms to realise a torque control as a basis for the speed control.

EPE 2005 - Topic 11-4a - DS: High performance drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 11: HIGH PERFORMANCE DRIVES > EPE 2005 - Topic 11-4a - DS: High performance drives
	[return to parent folder]

	A New Flux Weakening Operation of Interior Permanent Magnet Synchronous Motors for Railway Vehicle Traction By Toshifumi Yamakawa; Shinji Wakao; Keiichiro Kondo; Takashi Yoneyama	[View] [Download]
Abstract: This paper investigates a new flux-weakening operation of interior permanent magnet synchronous motors for railway vehicle traction. A design method of the controller is also suggested. The control method is verified both numerically and experimentally to ensure that it is feasible enough to be applied to the railway vehicle traction system.

	A Novel Technique to Estimate Rotor Time Constant in Vector Controlled Induction Motor Drives By CUPERTINO Francesco; BRANISLAV Zigmund; SALVATORE Luigi; MININNO Ernesto	[View] [Download]
Abstract: This paper presents a new technique to estimate the rotor time constant of vector-controlled induction motors (IMs). The estimation is based on the comparison between the expected speed trajectory corresponding to constant acceleration and the actual speed trajectory of the drive. In fact, when the drive operates under vector control with constant torque reference and load, it is expected that the motor has constant acceleration and rectilinear speed trajectory. A simple optimization algorithm, implemented on the same microcontroller used for vector control, updates on-line the rotor time constant trying to minimize the difference between the expected and the actual speed trajectories of the IM. The main advantages of our approach are the complete independence from motor mathematical model, and possibility of implementation on low-cost microcontrollers. Simulation and experimental results are presented to prove the accuracy and the effectiveness of the estimation technique.

	A Robust Method for Flux Weakening Operation of DTC Induction Motor Drive with On-Line Estimation of the Break-Down Torque By TANI Angelo; ZARRI Luca; SERRA Giovanni; CASADEI Domenico	[View] [Download]
Abstract: A method for the flux weakening operation of DTC induction motor drives is proposed. The flux reference is adjusted on the basis of the torque error, thus determining a spontaneous flux weakening. For implementing this algorithm, it is necessary to estimate the maximum torque that the induction machine is able to generate at any speed. The main features of the proposed system are little dependency on machine parameters and smooth transition into and out of the flux weakening operation mode. Experimental tests demonstrate the effectiveness of the control scheme.

	A Simple DTC-SVM Method for Matrix Converter Drives Using a Flux Deadbeat Scheme By FREDE Blaabjerg; LEE Ky; LEE Kwan	[View] [Download]
Abstract: In this paper, a simple direct torque control (DTC) method for sensorless matrix converter drives is proposed, which is characterized by a simple structure, minimal torque ripple and unity input power factor. Also a good sensorless speed-control performance in the low speed operation is obtained, while maintaining constant switching frequency and fast torque dynamics. It is possible to combine the advantages of matrix converters with the advantages of the DTC strategy using space vector modulation a deadbeat algorithm in the stator flux reference frame. Experimental results are shown to illustrate the feasibility of the proposed strategy.

	AN EFFICIENT ENERGY CONTROLLER FOR AN INDUCTION MOTOR DRIVE WITH COMPENSATION OF TEMPERATURE USING NEURAL NETWORKS By PERACAULA Juan; MOREN; PRYYMAK Bogdan	[View] [Download]
Abstract: A Neural Network (NN) Control is used to implement optimal flux in a vector control variable speed drive. A model of the motor losses allows the NN to calculate the flux for a maximum efficiency in each working point of the Induction Motor (IM). Taking into consideration the fact that nominal flux is not necessary for load torques below the rated torque of the IM, losses can be transferred from iron to copper decreasing the real flux and reaching the minimum total losses point. A complex loss model of the motor, including magnetic and thermal deviations of its parameters, is used to estimate losses. This can be useful in many applications where induction motors work below the nominal torque most of the time. To account for iron and copper losses, some inductances and resistances of the IM must be computed. Estimators are implemented for this purpose. Changes in resistance values due to temperature and in inductances due to iron saturation curves are also computed. Algorithms for computing the optimum flux with NN and vector control with this optimum flux were implemented in a DS1102 Controller Board from DSpace. In the sub-system for flux computation the neural network is trained to estimate the optimum rotor flux. Inputs to the NN are torque, speed and estimated rotor resistance of the IM and the output is the rotor flux.

	Current control for the Switched Reluctance Motor with enhanced Performance By BEKIESCH Joanna; SCHROEDER Guenter	[View] [Download]
Abstract: This paper presents a gain adaptation of the current PI controller with consideration of the variable time constant and an EMF compensation for the nonlinear switched reluctance machine. With this it is possible to minimize the disturbances in the control loop, which are related to the saturation or the back EMF. The compensation for each point of operation is done referring to the actual position, current and speed of the machine. Additionally a short comparison of hysteresis and PI controller is presented.

	Design and Comparison Direct Torque Control Techniques for Induction Motors By Marcin Zelechowski; Frede Blaabjerg; Marian P. Kazmierkowski; Darius Swierczynski; Wojciech Kolomyjski	[View] [Download]
Abstract: In this paper a comparison of two significant control methods of induction motor are presented. The first one is a classical Direct Torque and Flux Control (DTC) and is compared with a scheme, which uses Space Vector Modulator (DTC-SVM). A comparison in respect to dynamic and steady state performance of the drives is presented. The methods are compared in order to perform the demands from Adjustable Speed Drive (ASD). Simulation and experimental results for both methods are shown.

	Flux sliding mode control of a doubly fed induction machine By PIETRZA; VIDAL Pau	[View] [Download]
Abstract: This paper presents an original control strategy for Doubly Fed Induction Machine (DFIM) which both stator and rotor circuits are connected to individual Pulse Width Modulation (PWM) voltage source inverters. This configuration reduces the power converters size. We adopt the general Field Oriented Control (FOC) theory to a certain non linear strategy: Variable Struture Control (VSC), called also the Sliding Mode Control. To control the power exchanges between the stator and rotor sides of the machine, the authors adapt a power distribution constraint between the stator and the rotor windings. A flux model is presented and applied to this VSC strategy. The DFIM speed is also guaranteed by a Sliding Mode Control. The quasi-experimental results obtained by SABER software, are presented to validate this control strategy. The VSC robustness is also presented by introducing some DFIM parameters changing.

	Independent Vector Control of Two PM Motors with Five-Leg Inverter by the Expanded Two-Arm Modulation Method By MATSUSE Kouki; HIZUME Motoki; KIMURA Yuta	[View] [Download]
Abstract: This paper presents an independent vector control of two Permanent magnet (PM) motors with five-leg inverter by the expanded two-arm pulse-width modulation (PWM) method. This PWM method can control independently both PM motors that use the leg connected in common. Simulation results show that the proposed method is effective under various driving conditions.

	New Field-Weakening Control Considering Voltage Saturation for Vector Control System of Induction Motor By ENDO Ryo; OHISHI Kiyoshi; KANMACHI Toshiyuki	[View] [Download]
Abstract: This paper proposes a new field-weakening control considering inverter voltage saturation for vector controlled induction motor. The proposed method improves the output torque characteristics in the field-weakening region. The effectiveness of proposed method is verified by the numerical simulation results and the experimental results.

	Speed and Torque Control of a Permanent Magnet Excited Transverse Flux Motor for Direct Servo-Drive Applications By ORLIK Bernd; SCHUeTTLER Jochen; WERNER Uwe	[View] [Download]
Abstract: This paper deals with an innovative method to minimise the cogging torque of transverse flux motors in direct drive applications to achieve an accurate speed control. These approaches are based on calculated optimised current wave forms to realise a torque control as a basis for the speed control.