EPE Association: EPE 2022 - DS1j: Design, Optimisation and Control of Electric Drives

EPE 2022 - DS1j: Design, Optimisation and Control of Electric Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 05: Renewable Energy Power Systems > EPE 2022 - DS1j: Design, Optimisation and Control of Electric Drives

   [return to parent folder]

   Active control of gear mesh vibration using a permanent-magnet synchronous motor and simultaneous equation method
By Dominik REITMEIER [View]
[Download]

Abstract: This paper presents an active vibration control (AVC) for gear mesh vibrations. The vibrations are reduced by an additional motor torque. To determine the amplitude and phase of the torque without prior identification of the controlled system parameters, a narrowband AVC using the simultaneous equation method is presented.

   Algorithm for optimal selection of drive motor transmission combination
By Dries JACQUES [View]
[Download]

Abstract: For machine builders, it is essential to have an optimal balance between economic benefit and fulfillment of the technical requirements when selecting an appropriate driveline. This paper proposes a practical tool for finding the optimal drive-motor-transmission combination from a database of available devices. The algorithm denoted as the optimal selection tool consists of four main steps. The three first steps are dedicated to efficiently finding the triplets that meet the technical requirements and feasibilities (such as current-, torque-, speed- and ratio-limitations). The last step implements the branch and bound algorithm to find the optimal solution in terms of price. The algorithm avoids unnecessary checks of not technically feasible combinations. This is possible because the motors and drives are sorted with ascending peak current and the transmissions with an ascending ratio in the database. The algorithm's utility is demonstrated in a validation example of a transfer robot (pick-and-place unit), where a drive-motor-transmission combination with the lowest possible price must be selected. This combination must fulfill the technical requirements. Because of the optimization, the possible 3276 combinations were reduced to 302 technically feasible combinations, which means a significant reduction of 90\%. Furthermore, this reduction implies a decrease in computational load. After that, the fourth step selects the combination with the lowest price, which is 1668 units. This price is five times lower than the most expensive combination (8408 units).

   Direct Active Stabilization of the DC-Link in Voltage-Source Converters
By Mohamad KOTEICH [View]
[Download]

Abstract: This paper presents an active stabilization method of the dc-link voltage in voltage-source converters. It is a direct compensation method, acting on the converter command voltages instead of the current loop reference, which allows for a wider bandwidth. The proposed method is compared to the state-of-the-art direct compensation method, i.e. filtering the dc-voltage used in the pulse-width-modulation process. The effectiveness of the proposed method over the complete operating range is demonstrated with theoretical analysis and simulation results.

   Drive Level Parameter Identification of an Induction Motor
By Andreas BÜNTE [View]
[Download]

Abstract: A method to identify the electrical parameters of an inverter-fed induction motor is presented, whichdetermines the saturation characteristic of the mutual inductance and the other parameters separately.Current displacement effects are taken into account. An advantage of this scheme is the insensitivity tovoltage errors of the inverter. To achieve this, the identification of the constant parameters is based onthe fact that the inverter primarily influences only the real part of the impedance. For the identificationof the saturation characteristic, the impedance difference for 2 different but closely spaced frequencies isevaluated for different magnetic operating points.

   High-Bandwidth Power Hardware-in-the-Loop for Motor and Battery Emulation at High Voltage Levels
By Manuel FISCHER [View]
[Download]

Abstract: Power hardware-in-the-loop (PHIL) emulation of batteries and electric machines is an efficient method to accelerate the development and testing process of traction inverters and their control systems at different operating conditions. This paper presents the overall setup of a high-bandwidth, high-voltage PHIL system. Real-time machine and battery models, a control unit for the power electronics device and the power electronic device itself are highlighted as the most relevant parts of the PHIL system. Multiple approaches fulfilling the requirements of these parts are explained in detail. Finally, this paper determines the most suitable approaches to setting up a modular PHIL system that is scalable in terms of power range and number of output connectors.The overall hardware of the PHIL system with the described components is set up. Concludingmeasurement results prove its performance.

   Impact on the torque and on the copper losses under fault-tolerant Control of 5-phase PMSG
By Abdoulaye DIENG [View]
[Download]

Abstract: Here an analysis of the impact on the torque and on the copper losses under fault operation is done. The goal of each adopted torque control strategy is to generate current references to maximize the average torque and to minimize the copper losses. An itemized analysis is done.

   Influences of conductor positions and fast rising impulse voltages on the line-end coil based on a three-phase high-frequency model
By Ting HELMHOLDT-ZHU [View]
[Download]

Abstract: Due to the steep-edged voltage impulses from the new generation of power electronics, the lifespan ofstator insulation systems is significantly shortened. In this paper, a three-phase high-frequency (HF)model based on multi-conductor transmission line theories (MTLs) is developed to predict the electricalfield distributions of each conductor in the line-end coils. In addition, the results of possible best andworst conductor spatial distributions in the stator slot from the one-phase HF model on the basis ofgenetic algorithms are also further investigated by the three-phase HF model. Finally, the theoreticalresults are validated through partial discharge measurements.

   Inverter-machine parametric co-design for energy efficient electric drives
By Jaedon KWAK [View]
[Download]

Abstract: This paper presents the development of a unified parametric machine-inverter design framework targeted at energy efficiency optimization that is taking into account the most frequent operational conditions and the integral of the power losses over time. A case study is conducted with 400V-30kW ISG in hybrid electric vehicle application. For 3L-ANPC with wide band gap device, various switching frequencies, and different type of topologies and PWM strategies are compared with respect to energy loss in both inverter and machine. The machine design methodology is presented considering interactive effect between inverter and machine. As a result, proposed design has an advantage of energy loss compared to conventional design. The activity will contribute to drive progress beyond state-of-the-art in key application domains.

   Long Switching Horizon Model Predictive Controller for High-Speed Integrated Modular Motor Drives
By Martin SCHIESTL [View]
[Download]

Abstract: High-speed motor drives are becoming more common in industrial applications. As they are characterised by low inductance, high switching frequencies of the inverter are required, therefore limiting the control cycle time. To cope with these issues, a direct model predictive controller with long switching horizon is proposed in this paper.

   Low Phase Shift Filter for Current Sensing based on the Difference between AC Machine Models with and without Iron Losses
By Niklas HIMKER [View]
[Download]

Abstract: For a current measurement with the goals of a high bandwidth and a high sampling rate, a filter with minimal phase shift is proposed. The filter is analytically derived using the differential equation of an induction machine (IM) model and is based on the difference in the stator current behaviour of machines with and without iron losses. To use this filter, only two parameters need to be set.

   Model Predictive Position Control of Electrical Drives on an Industrial PC
By Fabian KARAU [View]
[Download]

Abstract: Dynamic position control of electric drives is of high importance in many industrial applications.In addition to the classic cascade control based on P and PI controllers for this task, advanced controls such as model predictive control (MPC) are receiving increasing attention.However, one drawback of MPC is the high computational power required, which makes it difficult to implement, especially for older servo drives.In this paper, we show how an industrial PC (IPC) that is available at many plants anyway can be used to implement MPC for position control of a simple drive system.Occurring dead times can be considered directly by the MPC.

   Novel Extended Robust Disturbance Observer for Improved Cogging Force Compensation in Permanent Magnet Linear Motors
By Franz LUCKERT [View]
[Download]

Abstract: This paper presents an extended robust disturbance observer for improved force ripple compensation of a permanent magnet synchronous linear motor. In extension, working from the output of the robust disturbance observer, the amplitudes of dominant harmonics are estimated by means of a harmonicactivated neural network. With the knowledge of the amplitude, the phase shift of an individual harmonic resulting from the robust disturbance observer can be corrected. This method improves the cogging force compensation by feedforward, especially when the frequency of the force ripple increases due to higher travelling speeds.

   Novel Quasi-Direct Rotor Position Estimator for Permanent Magnet Synchronous Machines based on the Back-Electromotive Force using Current Oversampling
By Georg LINDEMANN [View]
[Download]

Abstract: This paper presents an approach for rotor position estimation in permanent magnet synchronous machines (PMSMs) based on back-electromotive force (EMF). By directly evaluating the voltage equation and using current oversampling, highly responsive dynamics can be achieved. Online optimisation ensures an analytically adjustable, quasi-direct calculation of the rotor position.

   Optimal design of integrated motor drives - Comparison of topologies (2L/3L/modular), PWM variants, and switch technologies (Si/SiC/GaN)
By Thilo BRINGEZU [View]
[Download]

Abstract: In this paper, a new design procedure for the optimal design of an integrated motor drive is presented, including an extended iron loss model. The design procedure is based on a multi-objective optimization of power density, efficiency, and cost. In the optimization, a large design space is covered, including the inverter topology, the PWM scheme, the chip technology (Si/SiC/GaN), the winding scheme, the chip area/cost, and the switching frequency. In addition to power density/efficiency/cost, the system reliability is investigated. Considering a 1.5kW IMD as example, the optimal design in terms of efficiency and cost is achieved using a modular topology, GaN HEMTs, and a 9-phase motor winding. This design enables an efficiency increase of +2.26 \% at 36 \% higher cost compared to the cost-optimal design that is achieved with the standard 2L-topology, Si IGBTs, and a 3-phase motor winding.

   Parameter sensitivity of a MRAS-based sensorless control for AFPMSM considering speed accuracy and dynamic response at multiple parameter variations
By Michael BRÜNS [View]
[Download]

Abstract: In this paper, a novel approach is presented to tune the sensorless control based on a model reference adaptive system method (MRAS-based) in order to balance the variation of several system parameters. The method was used for speed and position estimation of a field-oriented controlled (FOC) wheel hub drive with an axial flux permanent magnet synchronous motor (AFPMSM). Parameter deviations of the control system are assumed to occur as disturbances. Their influences are reduced using an enhanced fundamental wave model of the AFPMSM. A model-based system engineering (MBSE) approach was chosen to compare simulation with experimental results. Following the simulation study, the MRAS-based method was implemented on a target system directly from the simulation models using code generation software. A performance evaluation of the tuning algorithm is focused on the accuracy of the calculated rotor position. The results demonstrate a resource-efficient MRAS implementation on a microcontroller (µC) suitable for operation with multiple parameter variations.

   Performances Analysis of Non-Model-Based Speed Estimation Algorithms for Motor Drives
By Luigi Danilo TORNELLO [View]
[Download]

Abstract: This paper investigates the performances of speed-controlled motor drives using non-model-based speed estimation algorithms. A suitable modelling of the speed estimation algorithms combined to the analytical representation of the instantaneous quantized speed of finite resolution position sensors are exploited to evaluate the filtering action of the estimation algorithms, and the stability and rejection to torque disturbances of speed-controlled drives at low rotational speeds; the last operating condition is very critical for motor drives, especially for that using low resolution position sensors. In this study, the theoretical analysis is experimentally validated on a 2kW PMSM drive.

   Predictive Braking Algorithm for Soft Starter Driven Induction Motors
By Hauke NANNEN [View]
[Download]

Abstract: Different algorithms exist for braking induction motors driven by soft starters. This paper investigates a model predictive algorithm for braking induction motors driven by soft starters in addition to state-of-the-art braking with grid phase rotation. Additionally, the impact of non-linear effects, e.g. saturation and the skin effect, on the predictive algorithm is discussed and evaluated based on simulations and measurements. Measurements of the different braking procedures are presented, compared and discussed. The measurements show that the total losses in the soft starter and the motor can be signi_cantly reduced by the application of the predictive algorithm instead of the conventionally used phase angle control algorithm.

   Saliency Extraction and Torque Sharing Estimation of Dual Motor Drive using Special Current Sensor Configuration
By Eduardo RODRIGUEZ MONTERO [View]
[Download]

Abstract: Dual motor drives refer to the control of two motors connected in parallel and fed by a single inverter. This type of drives is usual in some industry fields such as railway applications or conveyor drives. The control performance as well as the feasibility for saliency extraction are highly impacted by the arrangement and amount of current sensors equipped in the drive. Commonly, four current sensors in total are attached to two phases of each motor, thus permitting torque sharing calculation and individual spatial saliency extraction.In this work, two different current sensor configurations are applied to an experimental test stand consisting of two induction motors connected in parallel and fed by a single inverter. The two current sensor configurations are investigated and discussed for encoderless saliency extraction, control performance and torque sharing estimation capability.

   Self-Sensing Design and Control for an Induction Machine with an Additional Short-Circuited Rotor Coil
By Stefan LUECKE [View]
[Download]

Abstract: In order to control an electrical machine at lower speeds, several control methods require a saliency. This paper presents an induction machine design to achieve a saliency for high frequency injection signals.The saliency is characterized for a prototype and a control method for the whole operation range isshown.

   Synchronization Angle determination in DVCSFO of DFIM naval propulsion
By Youssef DRIMIZI [View]
[Download]

Abstract: This paper presents the Dual Vector Control with Stator Flux Orientation (DVCSFO) of Doubly FedInduction Machine (DFIM). This DFIM operates in motor mode and is intended for naval propulsion.This machine, without permanent magnets, is fed by two identical PWM VSIs. It has been speciallydesigned to share its power equally between the stator and the rotor. The previous studies have discussed the cooling of all system carried out by the water, for the stator and rotating rotor of DFIM and also for two IGBT VSIs. The stator and rotor fluxes are controlled in rotating «d,q» reference frame and must be maintained at their nominal value. Therefore, the DVCSFO strategy requires precise knowledge of all transformation angles and especially the Synchronization Angle when an incremental encoder is used as a speed sensor. Unlike the squirrel cage asynchronous machine, this DFIM actuator can be blocked if the synchronization angle is neglected in Park transformations.

EPE 2022 - DS1j: Design, Optimisation and Control of Electric Drives
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2022 ECCE Europe - Conference > EPE 2022 - Topic 05: Renewable Energy Power Systems > EPE 2022 - DS1j: Design, Optimisation and Control of Electric Drives
	[return to parent folder]

	Active control of gear mesh vibration using a permanent-magnet synchronous motor and simultaneous equation method By Dominik REITMEIER	[View] [Download]
Abstract: This paper presents an active vibration control (AVC) for gear mesh vibrations. The vibrations are reduced by an additional motor torque. To determine the amplitude and phase of the torque without prior identification of the controlled system parameters, a narrowband AVC using the simultaneous equation method is presented.

	Algorithm for optimal selection of drive motor transmission combination By Dries JACQUES	[View] [Download]
Abstract: For machine builders, it is essential to have an optimal balance between economic benefit and fulfillment of the technical requirements when selecting an appropriate driveline. This paper proposes a practical tool for finding the optimal drive-motor-transmission combination from a database of available devices. The algorithm denoted as the optimal selection tool consists of four main steps. The three first steps are dedicated to efficiently finding the triplets that meet the technical requirements and feasibilities (such as current-, torque-, speed- and ratio-limitations). The last step implements the branch and bound algorithm to find the optimal solution in terms of price. The algorithm avoids unnecessary checks of not technically feasible combinations. This is possible because the motors and drives are sorted with ascending peak current and the transmissions with an ascending ratio in the database. The algorithm's utility is demonstrated in a validation example of a transfer robot (pick-and-place unit), where a drive-motor-transmission combination with the lowest possible price must be selected. This combination must fulfill the technical requirements. Because of the optimization, the possible 3276 combinations were reduced to 302 technically feasible combinations, which means a significant reduction of 90\%. Furthermore, this reduction implies a decrease in computational load. After that, the fourth step selects the combination with the lowest price, which is 1668 units. This price is five times lower than the most expensive combination (8408 units).

	Direct Active Stabilization of the DC-Link in Voltage-Source Converters By Mohamad KOTEICH	[View] [Download]
Abstract: This paper presents an active stabilization method of the dc-link voltage in voltage-source converters. It is a direct compensation method, acting on the converter command voltages instead of the current loop reference, which allows for a wider bandwidth. The proposed method is compared to the state-of-the-art direct compensation method, i.e. filtering the dc-voltage used in the pulse-width-modulation process. The effectiveness of the proposed method over the complete operating range is demonstrated with theoretical analysis and simulation results.

	Drive Level Parameter Identification of an Induction Motor By Andreas BÜNTE	[View] [Download]
Abstract: A method to identify the electrical parameters of an inverter-fed induction motor is presented, whichdetermines the saturation characteristic of the mutual inductance and the other parameters separately.Current displacement effects are taken into account. An advantage of this scheme is the insensitivity tovoltage errors of the inverter. To achieve this, the identification of the constant parameters is based onthe fact that the inverter primarily influences only the real part of the impedance. For the identificationof the saturation characteristic, the impedance difference for 2 different but closely spaced frequencies isevaluated for different magnetic operating points.

	High-Bandwidth Power Hardware-in-the-Loop for Motor and Battery Emulation at High Voltage Levels By Manuel FISCHER	[View] [Download]
Abstract: Power hardware-in-the-loop (PHIL) emulation of batteries and electric machines is an efficient method to accelerate the development and testing process of traction inverters and their control systems at different operating conditions. This paper presents the overall setup of a high-bandwidth, high-voltage PHIL system. Real-time machine and battery models, a control unit for the power electronics device and the power electronic device itself are highlighted as the most relevant parts of the PHIL system. Multiple approaches fulfilling the requirements of these parts are explained in detail. Finally, this paper determines the most suitable approaches to setting up a modular PHIL system that is scalable in terms of power range and number of output connectors.The overall hardware of the PHIL system with the described components is set up. Concludingmeasurement results prove its performance.

	Impact on the torque and on the copper losses under fault-tolerant Control of 5-phase PMSG By Abdoulaye DIENG	[View] [Download]
Abstract: Here an analysis of the impact on the torque and on the copper losses under fault operation is done. The goal of each adopted torque control strategy is to generate current references to maximize the average torque and to minimize the copper losses. An itemized analysis is done.

	Influences of conductor positions and fast rising impulse voltages on the line-end coil based on a three-phase high-frequency model By Ting HELMHOLDT-ZHU	[View] [Download]
Abstract: Due to the steep-edged voltage impulses from the new generation of power electronics, the lifespan ofstator insulation systems is significantly shortened. In this paper, a three-phase high-frequency (HF)model based on multi-conductor transmission line theories (MTLs) is developed to predict the electricalfield distributions of each conductor in the line-end coils. In addition, the results of possible best andworst conductor spatial distributions in the stator slot from the one-phase HF model on the basis ofgenetic algorithms are also further investigated by the three-phase HF model. Finally, the theoreticalresults are validated through partial discharge measurements.

	Inverter-machine parametric co-design for energy efficient electric drives By Jaedon KWAK	[View] [Download]
Abstract: This paper presents the development of a unified parametric machine-inverter design framework targeted at energy efficiency optimization that is taking into account the most frequent operational conditions and the integral of the power losses over time. A case study is conducted with 400V-30kW ISG in hybrid electric vehicle application. For 3L-ANPC with wide band gap device, various switching frequencies, and different type of topologies and PWM strategies are compared with respect to energy loss in both inverter and machine. The machine design methodology is presented considering interactive effect between inverter and machine. As a result, proposed design has an advantage of energy loss compared to conventional design. The activity will contribute to drive progress beyond state-of-the-art in key application domains.

	Long Switching Horizon Model Predictive Controller for High-Speed Integrated Modular Motor Drives By Martin SCHIESTL	[View] [Download]
Abstract: High-speed motor drives are becoming more common in industrial applications. As they are characterised by low inductance, high switching frequencies of the inverter are required, therefore limiting the control cycle time. To cope with these issues, a direct model predictive controller with long switching horizon is proposed in this paper.

	Low Phase Shift Filter for Current Sensing based on the Difference between AC Machine Models with and without Iron Losses By Niklas HIMKER	[View] [Download]
Abstract: For a current measurement with the goals of a high bandwidth and a high sampling rate, a filter with minimal phase shift is proposed. The filter is analytically derived using the differential equation of an induction machine (IM) model and is based on the difference in the stator current behaviour of machines with and without iron losses. To use this filter, only two parameters need to be set.

	Model Predictive Position Control of Electrical Drives on an Industrial PC By Fabian KARAU	[View] [Download]
Abstract: Dynamic position control of electric drives is of high importance in many industrial applications.In addition to the classic cascade control based on P and PI controllers for this task, advanced controls such as model predictive control (MPC) are receiving increasing attention.However, one drawback of MPC is the high computational power required, which makes it difficult to implement, especially for older servo drives.In this paper, we show how an industrial PC (IPC) that is available at many plants anyway can be used to implement MPC for position control of a simple drive system.Occurring dead times can be considered directly by the MPC.

	Novel Extended Robust Disturbance Observer for Improved Cogging Force Compensation in Permanent Magnet Linear Motors By Franz LUCKERT	[View] [Download]
Abstract: This paper presents an extended robust disturbance observer for improved force ripple compensation of a permanent magnet synchronous linear motor. In extension, working from the output of the robust disturbance observer, the amplitudes of dominant harmonics are estimated by means of a harmonicactivated neural network. With the knowledge of the amplitude, the phase shift of an individual harmonic resulting from the robust disturbance observer can be corrected. This method improves the cogging force compensation by feedforward, especially when the frequency of the force ripple increases due to higher travelling speeds.

	Novel Quasi-Direct Rotor Position Estimator for Permanent Magnet Synchronous Machines based on the Back-Electromotive Force using Current Oversampling By Georg LINDEMANN	[View] [Download]
Abstract: This paper presents an approach for rotor position estimation in permanent magnet synchronous machines (PMSMs) based on back-electromotive force (EMF). By directly evaluating the voltage equation and using current oversampling, highly responsive dynamics can be achieved. Online optimisation ensures an analytically adjustable, quasi-direct calculation of the rotor position.

	Optimal design of integrated motor drives - Comparison of topologies (2L/3L/modular), PWM variants, and switch technologies (Si/SiC/GaN) By Thilo BRINGEZU	[View] [Download]
Abstract: In this paper, a new design procedure for the optimal design of an integrated motor drive is presented, including an extended iron loss model. The design procedure is based on a multi-objective optimization of power density, efficiency, and cost. In the optimization, a large design space is covered, including the inverter topology, the PWM scheme, the chip technology (Si/SiC/GaN), the winding scheme, the chip area/cost, and the switching frequency. In addition to power density/efficiency/cost, the system reliability is investigated. Considering a 1.5kW IMD as example, the optimal design in terms of efficiency and cost is achieved using a modular topology, GaN HEMTs, and a 9-phase motor winding. This design enables an efficiency increase of +2.26 \% at 36 \% higher cost compared to the cost-optimal design that is achieved with the standard 2L-topology, Si IGBTs, and a 3-phase motor winding.

	Parameter sensitivity of a MRAS-based sensorless control for AFPMSM considering speed accuracy and dynamic response at multiple parameter variations By Michael BRÜNS	[View] [Download]
Abstract: In this paper, a novel approach is presented to tune the sensorless control based on a model reference adaptive system method (MRAS-based) in order to balance the variation of several system parameters. The method was used for speed and position estimation of a field-oriented controlled (FOC) wheel hub drive with an axial flux permanent magnet synchronous motor (AFPMSM). Parameter deviations of the control system are assumed to occur as disturbances. Their influences are reduced using an enhanced fundamental wave model of the AFPMSM. A model-based system engineering (MBSE) approach was chosen to compare simulation with experimental results. Following the simulation study, the MRAS-based method was implemented on a target system directly from the simulation models using code generation software. A performance evaluation of the tuning algorithm is focused on the accuracy of the calculated rotor position. The results demonstrate a resource-efficient MRAS implementation on a microcontroller (µC) suitable for operation with multiple parameter variations.

	Performances Analysis of Non-Model-Based Speed Estimation Algorithms for Motor Drives By Luigi Danilo TORNELLO	[View] [Download]
Abstract: This paper investigates the performances of speed-controlled motor drives using non-model-based speed estimation algorithms. A suitable modelling of the speed estimation algorithms combined to the analytical representation of the instantaneous quantized speed of finite resolution position sensors are exploited to evaluate the filtering action of the estimation algorithms, and the stability and rejection to torque disturbances of speed-controlled drives at low rotational speeds; the last operating condition is very critical for motor drives, especially for that using low resolution position sensors. In this study, the theoretical analysis is experimentally validated on a 2kW PMSM drive.

	Predictive Braking Algorithm for Soft Starter Driven Induction Motors By Hauke NANNEN	[View] [Download]
Abstract: Different algorithms exist for braking induction motors driven by soft starters. This paper investigates a model predictive algorithm for braking induction motors driven by soft starters in addition to state-of-the-art braking with grid phase rotation. Additionally, the impact of non-linear effects, e.g. saturation and the skin effect, on the predictive algorithm is discussed and evaluated based on simulations and measurements. Measurements of the different braking procedures are presented, compared and discussed. The measurements show that the total losses in the soft starter and the motor can be signi_cantly reduced by the application of the predictive algorithm instead of the conventionally used phase angle control algorithm.

	Saliency Extraction and Torque Sharing Estimation of Dual Motor Drive using Special Current Sensor Configuration By Eduardo RODRIGUEZ MONTERO	[View] [Download]
Abstract: Dual motor drives refer to the control of two motors connected in parallel and fed by a single inverter. This type of drives is usual in some industry fields such as railway applications or conveyor drives. The control performance as well as the feasibility for saliency extraction are highly impacted by the arrangement and amount of current sensors equipped in the drive. Commonly, four current sensors in total are attached to two phases of each motor, thus permitting torque sharing calculation and individual spatial saliency extraction.In this work, two different current sensor configurations are applied to an experimental test stand consisting of two induction motors connected in parallel and fed by a single inverter. The two current sensor configurations are investigated and discussed for encoderless saliency extraction, control performance and torque sharing estimation capability.

	Self-Sensing Design and Control for an Induction Machine with an Additional Short-Circuited Rotor Coil By Stefan LUECKE	[View] [Download]
Abstract: In order to control an electrical machine at lower speeds, several control methods require a saliency. This paper presents an induction machine design to achieve a saliency for high frequency injection signals.The saliency is characterized for a prototype and a control method for the whole operation range isshown.

	Synchronization Angle determination in DVCSFO of DFIM naval propulsion By Youssef DRIMIZI	[View] [Download]
Abstract: This paper presents the Dual Vector Control with Stator Flux Orientation (DVCSFO) of Doubly FedInduction Machine (DFIM). This DFIM operates in motor mode and is intended for naval propulsion.This machine, without permanent magnets, is fed by two identical PWM VSIs. It has been speciallydesigned to share its power equally between the stator and the rotor. The previous studies have discussed the cooling of all system carried out by the water, for the stator and rotating rotor of DFIM and also for two IGBT VSIs. The stator and rotor fluxes are controlled in rotating «d,q» reference frame and must be maintained at their nominal value. Therefore, the DVCSFO strategy requires precise knowledge of all transformation angles and especially the Synchronization Angle when an incremental encoder is used as a speed sensor. Unlike the squirrel cage asynchronous machine, this DFIM actuator can be blocked if the synchronization angle is neglected in Park transformations.