EPE Association: EPE 2005 - Topic 11-1 - LS: Induction motor drives

EPE 2005 - Topic 11-1 - LS: Induction motor 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 11-1 - LS: Induction motor drives

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   Dynamic-Performance Comparison of IRFO and SFO–SM Controlled Drives in Field-Weakening Region using Variable-Saturation Regulators
By CASCELLA Giuseppe Leonardo; CUPERTINO Francesco; SALVATORE Nadia [View]
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Abstract: This paper proposes to use variable-saturation regulators for induction motor drives operating in field-weakening region, and presents a comparative dynamic-performance analysis between the traditional Indirect Rotor Field Oriented (IRFO) control scheme and a new Stator Flux Oriented – Sliding Mode (SFO-SM) control scheme. The traditional IRFO control scheme has the d-axis current component, torque, rotor flux, and speed loops with four PI-type controllers. The SFO-SM control system is a Direct Torque Control – Space Vector Modulation (DTC-SVM) scheme with closed loops of torque and stator flux without current PI-type controllers. Both control schemes use regulators with variable-saturation in such a way that maximum dc-bus voltage utilization is reached and overcurrent problems are prevented. The experiments are carried out using dSpace digital controllers and comparative results show that the SFO-SM controlled Induction Motor (IM) drive and IRFO one are characterized by similar dynamic responses in spite of structural simplicity of the SFO-SM control scheme.

   Experimental performance evaluation of six-phase series-connected two-motor drive systems
By JONES Martin; VUKOSAVIC Slobodan; LEVI Emil [View]
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Abstract: It has been shown recently that it is possible to connect in series the stator windings of multi-phase machines in such a way that all the machines in the group can be controlled independently using field orientation principles, although the complete multi-motor drive system is supplied from a single voltage source inverter (VSI). This paper deals with one particular case, a series-connected two-motor six-phase drive system. Two configurations are tested experimentally. Both include a symmetrical six-phase induction machine, while the second machine is at first a three-phase induction machine and then a permanent magnet synchronous machine (PMSM). Additionally, experimental results obtained with a single six-phase motor drive are included as well, thus enabling a thorough discussion of the dynamic performance of the series-connected two-motor drive systems. The operating principles of the drive systems are at first reviewed and a brief description of the experimental rig is then given. The emphasis is placed on an extensive presentation of experimental results, collected from the rig in the already mentioned three different configurations. An ultimate proof that truly independent and decoupled vector control of the two machines is achieved, although a single supply source is used, is thus provided.

   New Direct Torque Control Scheme for Induction Motors
By JAYNE Marcel; ROMERAL Jose Luis ; WITTING Phil; POU Josep; DEL TORO Xavier; ARIAS Antoni [View]
[Download]

Abstract: In this paper a novel controller based on Direct Torque Control is presented. This controller has been designed to be applied in the control of induction motors fed with a three-level Voltage Source Inverter (VSI). This type of inverter has several advantages over the standard two-level VSI, such as a greater number of levels in the output voltage waveforms, less harmonic distortion and lower switchingfrequencies. In the new controller the hysteresis regulators and look-up table are not used, and instead, the torque and stator flux errors are used together with the motor speed to generate a reference voltage vector that can be synthesized using different techniques afterwards. Experimental results of the novel system are presented and compared with those obtained for Classical DTC system when employing two-level VSI.The new controller is shown to reduce the ripple in the torque and flux responses. Lower current distortion and switching frequency of the semiconductor devices are also obtained in the new system presented.

EPE 2005 - Topic 11-1 - LS: Induction motor 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 11-1 - LS: Induction motor drives
	[return to parent folder]

	Dynamic-Performance Comparison of IRFO and SFO–SM Controlled Drives in Field-Weakening Region using Variable-Saturation Regulators By CASCELLA Giuseppe Leonardo; CUPERTINO Francesco; SALVATORE Nadia	[View] [Download]
Abstract: This paper proposes to use variable-saturation regulators for induction motor drives operating in field-weakening region, and presents a comparative dynamic-performance analysis between the traditional Indirect Rotor Field Oriented (IRFO) control scheme and a new Stator Flux Oriented – Sliding Mode (SFO-SM) control scheme. The traditional IRFO control scheme has the d-axis current component, torque, rotor flux, and speed loops with four PI-type controllers. The SFO-SM control system is a Direct Torque Control – Space Vector Modulation (DTC-SVM) scheme with closed loops of torque and stator flux without current PI-type controllers. Both control schemes use regulators with variable-saturation in such a way that maximum dc-bus voltage utilization is reached and overcurrent problems are prevented. The experiments are carried out using dSpace digital controllers and comparative results show that the SFO-SM controlled Induction Motor (IM) drive and IRFO one are characterized by similar dynamic responses in spite of structural simplicity of the SFO-SM control scheme.

	Experimental performance evaluation of six-phase series-connected two-motor drive systems By JONES Martin; VUKOSAVIC Slobodan; LEVI Emil	[View] [Download]
Abstract: It has been shown recently that it is possible to connect in series the stator windings of multi-phase machines in such a way that all the machines in the group can be controlled independently using field orientation principles, although the complete multi-motor drive system is supplied from a single voltage source inverter (VSI). This paper deals with one particular case, a series-connected two-motor six-phase drive system. Two configurations are tested experimentally. Both include a symmetrical six-phase induction machine, while the second machine is at first a three-phase induction machine and then a permanent magnet synchronous machine (PMSM). Additionally, experimental results obtained with a single six-phase motor drive are included as well, thus enabling a thorough discussion of the dynamic performance of the series-connected two-motor drive systems. The operating principles of the drive systems are at first reviewed and a brief description of the experimental rig is then given. The emphasis is placed on an extensive presentation of experimental results, collected from the rig in the already mentioned three different configurations. An ultimate proof that truly independent and decoupled vector control of the two machines is achieved, although a single supply source is used, is thus provided.

	New Direct Torque Control Scheme for Induction Motors By JAYNE Marcel; ROMERAL Jose Luis ; WITTING Phil; POU Josep; DEL TORO Xavier; ARIAS Antoni	[View] [Download]
Abstract: In this paper a novel controller based on Direct Torque Control is presented. This controller has been designed to be applied in the control of induction motors fed with a three-level Voltage Source Inverter (VSI). This type of inverter has several advantages over the standard two-level VSI, such as a greater number of levels in the output voltage waveforms, less harmonic distortion and lower switchingfrequencies. In the new controller the hysteresis regulators and look-up table are not used, and instead, the torque and stator flux errors are used together with the motor speed to generate a reference voltage vector that can be synthesized using different techniques afterwards. Experimental results of the novel system are presented and compared with those obtained for Classical DTC system when employing two-level VSI.The new controller is shown to reduce the ripple in the torque and flux responses. Lower current distortion and switching frequency of the semiconductor devices are also obtained in the new system presented.