EPE Association: EPE 2011 - DS3g: Topic 10:Other Electric Machines

EPE 2011 - DS3g: Topic 10:Other Electric Machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 10: Electrical Machines > EPE 2011 - DS3g: Topic 10:Other Electric Machines

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   A Novel Method for Torque Ripple Reduction in 6/4 Two Rotor Stack Switched Reluctance Motor
By Alireza SIADATAN, Majid ASGAR, Vahid NAJMI, Ebrahim AFJEI [View]
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Abstract: In this paper, a new configuration for a three phase Switched Reluctance (SR) Machine is introduced. The proposed machine consists of two magnetically independent stator and rotor layers, where each stator layer includes six salient poles with windings wrapped around them, while the rotor comprises of four salient poles with different arc lengths and no windings. There is a stationary reel, which has the field coils wrapped around it and is placed between the two-stator sets. The distinctive point of this proposed machine is its ability to work in motor and generator modes, which leads to hybrid operation. The mathematical model is carried out to obtain the characteristics of this motor. The torque ripple reduction is done as well by shifting the rotor in one of sets. In a proposed method the rotor angle shifting is used to increase overlap between rotor and stator poles. Subsequently, machine operation as switched reluctance motor is simulated by Finite Element Method (FEM).

   Flux-Weakening Strategies for a Five-Phase PM Synchronous Machine
By Li LU, Eric SEMAIL, Luc KOBYLANSKI, Xavier KESTELYN [View]
[Download]

Abstract: In order to get a low cost mild hybrid system, a global objective is to keep the actual thermal engine architecture. As consequence, the current clawpole synchronous automotive generator must be replaced by a new more powerful electrical machine but with the same large speed range [0 -18000 rpm]. In the project, a power of 15 kW and a DC bus voltage of 60V have been chosen to provide a regenerative breaking at minimum cost. With this payload (250A for the DC bus current), a five-phase machine appears to be interesting because MOSFET transistors of the voltage source inverter (VSI) have not to be used in parallel configuration (only two rated 150A transistors per leg for the VSI). As the speed range is large, a flux weakening must be applied. As the five-phase drives have more degrees of freedom than three-phase ones, different flux weakening strategies can be considered. The aim of this paper is to compare one of them.

   Fundamental experiments of transfer device using ultrasonic levitation
By Katsushi FURUTANI, Masataka ONO [View]
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Abstract: A noncontact transfer device using a combination of ultrasonic levitation with flexure traveling wave has some advantage in clean environment and simple device configuration. This paper deals with the concept of a two-dimensional transfer device using ultrasonic levitation, and fundamental experiments. A prototype of a one-dimensional transfer device was built and examined to assess design criteria of a two-dimensional transfer device. A prototype of the two-dimensional transfer device with four bolted Langevin transducers (BLTs) was constructed based on the results of the preliminary experiments. Thrust by the flexure traveling wave was observed. Some characteristics were measured under various frequency, phase difference and applied voltage. The velocity and levitation height were increased with an increase of the applied voltage to the BLTs. A carried plate was moved at 55 mm/s under the conditions of 1300 Vp-p as the applied voltage, 19900 Hz as the driving frequency and 90 degrees as the phase difference. In this case, the levitation height was 140 um.

   Parameter adaptation of a sensorless controlled induction machine by measurement of the slip frequency
By Markus RUETER, Wolfgang OBERSCHELP, Guenter SCHROEDER [View]
[Download]

Abstract: In this paper a method is depicted, that enables a highly precise speed control of an induction machine, designed as squirrel cage rotor, without use of a sensor.The speed of an induction machine depends on the rotary field assigned as well as on the load of the machine. In general, the load and with it the slip is unknown. So, the fundamental wave model does not reveal any information about the exact speed. It is impossible to find this information by observing the machine’s ideal equivalent circuit. This leads to the fact that, as a rule, in an industrial environment sensorless controlled induction machines do not gain more than 0.5 \% speed precision in relation to the rated operating point. In case of need for more precise speed control, the use of a sensor has been essential up to now. As an alternative to the common sensor, this paper is showing a method by which the exact slip frequency and thus the exact speed of the induction machine can be detected by evaluation of anisotropies. This approach is making use of rotor anisotropies. Such anisotropies enable the measuring of the slip frequency, being the base of highly precise speed assessment. The slip frequency as well as update rate of the slip frequency measurement are low in the chosen analysis method. In order to prevent a reduction of the dynamics of the speed control by a low update rate of the slip frequency, the measured value of the rotor slip is not used directly in the evaluation of the rotation speed actual value. The measured value is used advantageously in adapting the model parameter rotor resistance to the reality. Based on this, a highly precise speed control can be ensured without any reductions in dynamics.

   Prediction of the sound power levels of squirrel cage induction machines in different operation points taking into account mechanical boundary conditions for mo
By Thomas KNOPIK, Andreas BINDER [View]
[Download]

Abstract: The electromagnetic forces due to the interaction of harmonic rotor and stator fields of various origins such as slotting, saturation, eccentricity and harmonics of the supply voltage due to inverter operation in induction machines are introduced. A modal analysis has to be done to judge, if these forces excite vibrations of the stator, which leads to noise emission of the motor. The modal analysis should take into account the mechanical boundary conditions due to machine mounting and the influence of the terminal box. As an analytical solution for this task is only hard to find and the simplifications of the structure lead to only roughly correct results, a numerical time-stepping model for Finite Element (FEM) analysis with ANSYS code is used, introducing mechanical boundary conditions, which is combined with the analytical force calculation. Measurement results of the noise power level LW for three TEFC-induction motors acc. to [1] show good coincidence with the calculation results and illustrate the improvement by using this modified calculation method.

   Sensorless Control of SRM by the Aid of Artificial Neural Network Adaptive Reference Model
By Constantin PAVLITOV, Hao CHEN, Ilhami COLAK, Tasho TASHEV, Yassen GORBOUNOV [View]
[Download]

Abstract: This paper deals with an adaptive reference controlled SRM, based on a virtual model implemented by the aid of artificial neural networks. That makes the model quite precise and adequate and permits real SRM and full-order observer to work in parallel. This observer promotes the implementation of sensorless control.

   Simulation of Linear Switched Reluctance Motor Drives
By Baldui BLANQUE, Pere ANDRADA, Jordi GARCIA-AMOROS [View]
[Download]

Abstract: This paper presents a simulation model of linear switched reluctance motor drives. A Matlab-Simulink environment coupled with finite element analysis is used to perform the simulations. Experimental and simulation results for a double sided linear switched motor drive prototype are reported and compared to verify the simulation model.

   THE CACULATION OF COGGING FORCE IN PERMANENT MAGNET LINEAR MOTOR BY USING OF ANALYTICAL AND FINITE ELEMENT METHODS
By Mohammad Reza ZAREH, Mousa MARZBAND, Edris POURESMAEIL [View]
[Download]

Abstract: No abstract provided.

EPE 2011 - DS3g: Topic 10:Other Electric Machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2011 ECCE Europe - Conference > EPE 2011 - Topic 10: Electrical Machines > EPE 2011 - DS3g: Topic 10:Other Electric Machines
	[return to parent folder]

	A Novel Method for Torque Ripple Reduction in 6/4 Two Rotor Stack Switched Reluctance Motor By Alireza SIADATAN, Majid ASGAR, Vahid NAJMI, Ebrahim AFJEI	[View] [Download]
Abstract: In this paper, a new configuration for a three phase Switched Reluctance (SR) Machine is introduced. The proposed machine consists of two magnetically independent stator and rotor layers, where each stator layer includes six salient poles with windings wrapped around them, while the rotor comprises of four salient poles with different arc lengths and no windings. There is a stationary reel, which has the field coils wrapped around it and is placed between the two-stator sets. The distinctive point of this proposed machine is its ability to work in motor and generator modes, which leads to hybrid operation. The mathematical model is carried out to obtain the characteristics of this motor. The torque ripple reduction is done as well by shifting the rotor in one of sets. In a proposed method the rotor angle shifting is used to increase overlap between rotor and stator poles. Subsequently, machine operation as switched reluctance motor is simulated by Finite Element Method (FEM).

	Flux-Weakening Strategies for a Five-Phase PM Synchronous Machine By Li LU, Eric SEMAIL, Luc KOBYLANSKI, Xavier KESTELYN	[View] [Download]
Abstract: In order to get a low cost mild hybrid system, a global objective is to keep the actual thermal engine architecture. As consequence, the current clawpole synchronous automotive generator must be replaced by a new more powerful electrical machine but with the same large speed range [0 -18000 rpm]. In the project, a power of 15 kW and a DC bus voltage of 60V have been chosen to provide a regenerative breaking at minimum cost. With this payload (250A for the DC bus current), a five-phase machine appears to be interesting because MOSFET transistors of the voltage source inverter (VSI) have not to be used in parallel configuration (only two rated 150A transistors per leg for the VSI). As the speed range is large, a flux weakening must be applied. As the five-phase drives have more degrees of freedom than three-phase ones, different flux weakening strategies can be considered. The aim of this paper is to compare one of them.

	Fundamental experiments of transfer device using ultrasonic levitation By Katsushi FURUTANI, Masataka ONO	[View] [Download]
Abstract: A noncontact transfer device using a combination of ultrasonic levitation with flexure traveling wave has some advantage in clean environment and simple device configuration. This paper deals with the concept of a two-dimensional transfer device using ultrasonic levitation, and fundamental experiments. A prototype of a one-dimensional transfer device was built and examined to assess design criteria of a two-dimensional transfer device. A prototype of the two-dimensional transfer device with four bolted Langevin transducers (BLTs) was constructed based on the results of the preliminary experiments. Thrust by the flexure traveling wave was observed. Some characteristics were measured under various frequency, phase difference and applied voltage. The velocity and levitation height were increased with an increase of the applied voltage to the BLTs. A carried plate was moved at 55 mm/s under the conditions of 1300 Vp-p as the applied voltage, 19900 Hz as the driving frequency and 90 degrees as the phase difference. In this case, the levitation height was 140 um.

	Parameter adaptation of a sensorless controlled induction machine by measurement of the slip frequency By Markus RUETER, Wolfgang OBERSCHELP, Guenter SCHROEDER	[View] [Download]
Abstract: In this paper a method is depicted, that enables a highly precise speed control of an induction machine, designed as squirrel cage rotor, without use of a sensor.The speed of an induction machine depends on the rotary field assigned as well as on the load of the machine. In general, the load and with it the slip is unknown. So, the fundamental wave model does not reveal any information about the exact speed. It is impossible to find this information by observing the machine’s ideal equivalent circuit. This leads to the fact that, as a rule, in an industrial environment sensorless controlled induction machines do not gain more than 0.5 \% speed precision in relation to the rated operating point. In case of need for more precise speed control, the use of a sensor has been essential up to now. As an alternative to the common sensor, this paper is showing a method by which the exact slip frequency and thus the exact speed of the induction machine can be detected by evaluation of anisotropies. This approach is making use of rotor anisotropies. Such anisotropies enable the measuring of the slip frequency, being the base of highly precise speed assessment. The slip frequency as well as update rate of the slip frequency measurement are low in the chosen analysis method. In order to prevent a reduction of the dynamics of the speed control by a low update rate of the slip frequency, the measured value of the rotor slip is not used directly in the evaluation of the rotation speed actual value. The measured value is used advantageously in adapting the model parameter rotor resistance to the reality. Based on this, a highly precise speed control can be ensured without any reductions in dynamics.

	Prediction of the sound power levels of squirrel cage induction machines in different operation points taking into account mechanical boundary conditions for mo By Thomas KNOPIK, Andreas BINDER	[View] [Download]
Abstract: The electromagnetic forces due to the interaction of harmonic rotor and stator fields of various origins such as slotting, saturation, eccentricity and harmonics of the supply voltage due to inverter operation in induction machines are introduced. A modal analysis has to be done to judge, if these forces excite vibrations of the stator, which leads to noise emission of the motor. The modal analysis should take into account the mechanical boundary conditions due to machine mounting and the influence of the terminal box. As an analytical solution for this task is only hard to find and the simplifications of the structure lead to only roughly correct results, a numerical time-stepping model for Finite Element (FEM) analysis with ANSYS code is used, introducing mechanical boundary conditions, which is combined with the analytical force calculation. Measurement results of the noise power level LW for three TEFC-induction motors acc. to [1] show good coincidence with the calculation results and illustrate the improvement by using this modified calculation method.

	Sensorless Control of SRM by the Aid of Artificial Neural Network Adaptive Reference Model By Constantin PAVLITOV, Hao CHEN, Ilhami COLAK, Tasho TASHEV, Yassen GORBOUNOV	[View] [Download]
Abstract: This paper deals with an adaptive reference controlled SRM, based on a virtual model implemented by the aid of artificial neural networks. That makes the model quite precise and adequate and permits real SRM and full-order observer to work in parallel. This observer promotes the implementation of sensorless control.

	Simulation of Linear Switched Reluctance Motor Drives By Baldui BLANQUE, Pere ANDRADA, Jordi GARCIA-AMOROS	[View] [Download]
Abstract: This paper presents a simulation model of linear switched reluctance motor drives. A Matlab-Simulink environment coupled with finite element analysis is used to perform the simulations. Experimental and simulation results for a double sided linear switched motor drive prototype are reported and compared to verify the simulation model.

	THE CACULATION OF COGGING FORCE IN PERMANENT MAGNET LINEAR MOTOR BY USING OF ANALYTICAL AND FINITE ELEMENT METHODS By Mohammad Reza ZAREH, Mousa MARZBAND, Edris POURESMAEIL	[View] [Download]
Abstract: No abstract provided.