EPE Association: EPE 2009 - Subtopic 11-3 - DS: 'Converter-Machine Interactions'

EPE 2009 - Subtopic 11-3 - DS: 'Converter-Machine Interactions'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 11: 'Adjustable Speed Drives' > EPE 2009 - Subtopic 11-3 - DS: 'Converter-Machine Interactions'

   [return to parent folder]

   A 3D-Coil Model for Bearing Current Analysis of Inverter-fed Drives
By Olaf HENZE, Stephan KOCH, Herbert DE GERSEM, Thomas WEILAND [View]
[Download]

Abstract: In this paper a study of a 3D-coil model which is suitable for the analysis of bearing currents in converter-fed induction motors is presented. The coil model consists of one slot surrounded by a part of the stator yoke. The thin lamination of the yoke is scaled up spatially in the direction of current propagation in the slot for the simulations. The excitation is carried out by means of a sinusoidal current at different frequencies. In a second set of simulations, a voltage surge is considered as the excitation signal. The bearing current is evaluated in frequency domain as well as in time domain.

   A multi-motor drive system based on Direct Power Converter
By Dinesh KUMAR [View]
[Download]

Abstract: This paper presents a multi-motor drive system based on a direct power converter used to drive two motors on the same shaft. The proposed power converter topology eliminates the requirement for DC-link components, reducing the weight and volume of the system. Simulation and experimental results are presented to verify and validate the proposed system.

   Active du/dt Filtering for Variable-Speed AC Drives
By Juha-Pekka STRÃ–M, Juho TYSTER, Juhamatti KORHONEN, Kimmo RAUMA, Hannu SARÃ‰N, Pertti SILVENTOINEN [View]
[Download]

Abstract: Cable reflection phenomenon in inverter-fed electric drives and typical solutions to the problem are presented in brief. Application of a new active du/dt filtering method based on a low-loss LC circuit and active control to eliminate the motor overvoltages is discussed in this paper. Active du/dt basic principles are presented along with experimental results to verify the potential of the concept. The main benefits of the method are the controllability of the output voltage du/dt within certain limits, considerably smaller inductances in the filter circuit resulting in a smaller physical component size, price, and excellent filtering performance. Moreover, no additional components are required, because the active control of the filter circuit takes place in the process of the upper-level PWMmodulation using the same power switches as the inverter output stage. Further, the active du/dt method will benefit from the development of semiconductor power switch modules, as new technologies and materials emerge, since the method requires additional switching in the output stage of the inverter and generation of narrow voltage pulses.

   Analysis and Synthesis of one Bogie Induction Railway Traction System
By Wiem BEN MABROUK, Jamel BELHADJ, Maria PIETRZAK-DAVID [View]
[Download]

Abstract: This paper presents a railway traction system characterized by strong electrical and mechanical interactions. The authors formulate the mechanical model to analyse system behaviour during loss wheel-rail adherence. Mean and Master-Slave controls with two observation strategies are developed. Different simulation results are given and illustrate the railway traction system operations.

   High-speed gate drive scheme for three-phase inverter with twenty nanosecond minimum gate drive pulse
By Juho TYSTER, Matti ISKANIUS, Juha-Pekka STRÃ–M, Juhamatti KORHONEN, Kimmo RAUMA, Hannu SARÃ‰N, Pertti SILVENTOINEN [View]
[Download]

Abstract: In this paper, we present a high-speed optical gate drive scheme for three-phase inverter. The gate drive signal is transmitted from control board to gate drivers with a frequency-shift keying modulation, using optical fiber. This gate drive signal transmission method is used with a commercial high-speed gate driver integrated circuit. The gate drive system is capable of producing minimum output voltage pulse of 20 nanoseconds. Using narrow voltage pulses, an active output filtering for variable speed drives can be implemented. Active output filtering is used to reduce the du/dt of a variable speed drive output voltage. This reduces the overvoltage at the end of a motor cable. An inverter prototype is constructed to study the active filtering method. The construction of the power stage utilizes MOSFETs with silicon carbide free-wheeling diodes. Measurement results for the gate drive system performance and inverter output voltage are presented.

   Influence of inverter output cable and filters on conducted emission
By Jos KNOCKAERT [View]
[Download]

Abstract: Fast switching of PWM-inverters cause a lot of electromagnetic interference (EMI). To lower the dv/dt, output filters are available. In this paper, the influence of the cable and the output filters on conducted emission is investigated. By combining impedance measurements and EMI-measurements particular dips in the spectrum can be explained.

   Motor Cable as an Origin of Supplementary Conducted EMI Emission of ASD
By Jaroslaw LUSZCZ [View]
[Download]

Abstract: Investigation of conducted electromagnetic interference (EMI) in AC motor drives fed by a pulse width modulated (PWM) voltage converters requires that convertersâ€™, motor windingsâ€™ and feeding cablesâ€™ parasitic capacitances have to be taken into account. Motor voltage transients and related EMI emission are substantially correlated with resonance effects occurring in load circuits. Frequency impedance characteristics analysis allows for identification and determination of resonance frequency ranges which have the foremost contribution to voltage ringing phenomena. The paper presents a method of analysis of AC motor windings parasitic capacitances with the particular account of cable influence on itâ€™s broadband overall performance. The proposed circuit model allows for analysis of influence of cable parameters on conducted EMI emission of AC motor drives.

   Sensorless Flux Model of Induction Machines using Cross-Saturation Effects Based on a Virtual Air Gap
By Guido TISBORN, Jochen SCHÃœTTLER, Bernd ORLIK [View]
[Download]

Abstract: This paper presents a main flux oriented model of an induction machine which considers the saturation in both magnetizing and leakage inductances. The model is based on a virtual air gap. With this model it is possible to simulate the saturation characteristic and the cross-saturation effect. The validity of these results is proved with measurements on a test bench. A procedure is presented that shows the changes in cross-saturation by a test signal injection during standstill. The fitting machine model offers a new corresponding flux model without a position or speed sensor, which could identify the flux position by this cross-saturation influence.

EPE 2009 - Subtopic 11-3 - DS: 'Converter-Machine Interactions'
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2009 - Conference > EPE 2009 - Topic 11: 'Adjustable Speed Drives' > EPE 2009 - Subtopic 11-3 - DS: 'Converter-Machine Interactions'
	[return to parent folder]

	A 3D-Coil Model for Bearing Current Analysis of Inverter-fed Drives By Olaf HENZE, Stephan KOCH, Herbert DE GERSEM, Thomas WEILAND	[View] [Download]
Abstract: In this paper a study of a 3D-coil model which is suitable for the analysis of bearing currents in converter-fed induction motors is presented. The coil model consists of one slot surrounded by a part of the stator yoke. The thin lamination of the yoke is scaled up spatially in the direction of current propagation in the slot for the simulations. The excitation is carried out by means of a sinusoidal current at different frequencies. In a second set of simulations, a voltage surge is considered as the excitation signal. The bearing current is evaluated in frequency domain as well as in time domain.

	A multi-motor drive system based on Direct Power Converter By Dinesh KUMAR	[View] [Download]
Abstract: This paper presents a multi-motor drive system based on a direct power converter used to drive two motors on the same shaft. The proposed power converter topology eliminates the requirement for DC-link components, reducing the weight and volume of the system. Simulation and experimental results are presented to verify and validate the proposed system.

	Active du/dt Filtering for Variable-Speed AC Drives By Juha-Pekka STRÃ–M, Juho TYSTER, Juhamatti KORHONEN, Kimmo RAUMA, Hannu SARÃ‰N, Pertti SILVENTOINEN	[View] [Download]
Abstract: Cable reflection phenomenon in inverter-fed electric drives and typical solutions to the problem are presented in brief. Application of a new active du/dt filtering method based on a low-loss LC circuit and active control to eliminate the motor overvoltages is discussed in this paper. Active du/dt basic principles are presented along with experimental results to verify the potential of the concept. The main benefits of the method are the controllability of the output voltage du/dt within certain limits, considerably smaller inductances in the filter circuit resulting in a smaller physical component size, price, and excellent filtering performance. Moreover, no additional components are required, because the active control of the filter circuit takes place in the process of the upper-level PWMmodulation using the same power switches as the inverter output stage. Further, the active du/dt method will benefit from the development of semiconductor power switch modules, as new technologies and materials emerge, since the method requires additional switching in the output stage of the inverter and generation of narrow voltage pulses.

	Analysis and Synthesis of one Bogie Induction Railway Traction System By Wiem BEN MABROUK, Jamel BELHADJ, Maria PIETRZAK-DAVID	[View] [Download]
Abstract: This paper presents a railway traction system characterized by strong electrical and mechanical interactions. The authors formulate the mechanical model to analyse system behaviour during loss wheel-rail adherence. Mean and Master-Slave controls with two observation strategies are developed. Different simulation results are given and illustrate the railway traction system operations.

	High-speed gate drive scheme for three-phase inverter with twenty nanosecond minimum gate drive pulse By Juho TYSTER, Matti ISKANIUS, Juha-Pekka STRÃ–M, Juhamatti KORHONEN, Kimmo RAUMA, Hannu SARÃ‰N, Pertti SILVENTOINEN	[View] [Download]
Abstract: In this paper, we present a high-speed optical gate drive scheme for three-phase inverter. The gate drive signal is transmitted from control board to gate drivers with a frequency-shift keying modulation, using optical fiber. This gate drive signal transmission method is used with a commercial high-speed gate driver integrated circuit. The gate drive system is capable of producing minimum output voltage pulse of 20 nanoseconds. Using narrow voltage pulses, an active output filtering for variable speed drives can be implemented. Active output filtering is used to reduce the du/dt of a variable speed drive output voltage. This reduces the overvoltage at the end of a motor cable. An inverter prototype is constructed to study the active filtering method. The construction of the power stage utilizes MOSFETs with silicon carbide free-wheeling diodes. Measurement results for the gate drive system performance and inverter output voltage are presented.

	Influence of inverter output cable and filters on conducted emission By Jos KNOCKAERT	[View] [Download]
Abstract: Fast switching of PWM-inverters cause a lot of electromagnetic interference (EMI). To lower the dv/dt, output filters are available. In this paper, the influence of the cable and the output filters on conducted emission is investigated. By combining impedance measurements and EMI-measurements particular dips in the spectrum can be explained.

	Motor Cable as an Origin of Supplementary Conducted EMI Emission of ASD By Jaroslaw LUSZCZ	[View] [Download]
Abstract: Investigation of conducted electromagnetic interference (EMI) in AC motor drives fed by a pulse width modulated (PWM) voltage converters requires that convertersâ€™, motor windingsâ€™ and feeding cablesâ€™ parasitic capacitances have to be taken into account. Motor voltage transients and related EMI emission are substantially correlated with resonance effects occurring in load circuits. Frequency impedance characteristics analysis allows for identification and determination of resonance frequency ranges which have the foremost contribution to voltage ringing phenomena. The paper presents a method of analysis of AC motor windings parasitic capacitances with the particular account of cable influence on itâ€™s broadband overall performance. The proposed circuit model allows for analysis of influence of cable parameters on conducted EMI emission of AC motor drives.

	Sensorless Flux Model of Induction Machines using Cross-Saturation Effects Based on a Virtual Air Gap By Guido TISBORN, Jochen SCHÃœTTLER, Bernd ORLIK	[View] [Download]
Abstract: This paper presents a main flux oriented model of an induction machine which considers the saturation in both magnetizing and leakage inductances. The model is based on a virtual air gap. With this model it is possible to simulate the saturation characteristic and the cross-saturation effect. The validity of these results is proved with measurements on a test bench. A procedure is presented that shows the changes in cross-saturation by a test signal injection during standstill. The fitting machine model offers a new corresponding flux model without a position or speed sensor, which could identify the flux position by this cross-saturation influence.