EPE Association: EPE-PEMC 2000 - Topic 08a: Induction Motors and Drives

EPE-PEMC 2000 - Topic 08a: Induction Motors and Drives
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 08: Electrical Machines and Actuators > EPE-PEMC 2000 - Topic 08a: Induction Motors and Drives

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   Damping Torque-Oscillations at Drives with Double Cage Induction Machine
By Tulbure A., Beck H.P. [View]
[Download]

Abstract: In the present paper a concept for damping of self-excited torsional oscillations in drive- systems with mains operated double-cage induction machines will be proposed. Considering the constructives parameters of induction machines (IM) and of load system the behaviour of the complet system has been simulated. The signal-waveforms will be compared with the experimental values. The strategy for active damping of torsional oscillations in the drive shaft bases on adaptive slip change of the induction machine. This task will be taken by the semiconductor-device assembled in the bottom-cage. The damping equipment makes possible a dynamic and low-loss adjustment of the characteristic curve of the motor. The simulations show that using the proposed strategy the magnitude of the torsional oscillations in the drive shaft can be reduced at about 50 %.

   Detection of Insulation Faults of Inverter-fed IM Drive
By Chrzan P.J., Ronkowski M., Champenois G.*, Nieznañski J. [View]
[Download]

Abstract: This paper deals with a method for monitoring unbalanced conditions in the squirrel cage induction machine resulting from short circuit of a coil in the stator-winding phase. Monitoring is carried out at standstill conditions during the initial process of self-commissioning of inverter-motor components before the start-up of the drive. The method is based on the parameter identification of one-axis induction motor model, which has been derived at dc excitation sequences. Series of electromagnetic parameters such as stator and leakage inductance, rotor time constant, stator resistance are identified by applying sigma-delta modulation of subsequent voltage vector positions along the machine air-gap circumference. Distribution of asymmetric parameters detects faulty conditions. Standard acquisition board with the aid of Matlab processing PC is used for experimentation.

   Identification and Non-linear Field Oriented Control of a Small Power Induction Machine
By Pierquin J., Millet C., Bergmann C. [View]
[Download]

Abstract: The paper deals with the modelling and the control of a small power actuator. The effects of main flux saturation are discussed through the comparison of two models. The transient selected for the models validation is a no-load start-up. Finally, several strategies based on a non-linear field oriented control are presented.

   MMF of High Phase Order Induction Motors with Different Angles between Stator Windings and Supply Voltages
By Grochowalski J. [View]
[Download]

Abstract: The problems of diminishing the pulsating torques in high power induction motor drives are investigated. This paper describes analysis and experimental results of MMF in 3 and 6 phase AC machines supplying by sinusoidal and nonsinusoidal currents. Analyses of 6 phase machines are for different angle between 3 phase stator windings and different time angles between currents in both 3 phase systems.

   Modelling and Simulation of a Single Phase Induction Motor with Adjustable Switched Capacitor
By Sunter S., Ozdemir M., Gumus B.* [View]
[Download]

Abstract: This paper presents an effective model of a single phase induction motor with an adjustable switching capacitor. Using an adjustable switched capacitor connected in series to auxiliary winding is one of the methods to obtain maximum torque in the single phase induction motor. The duty period of the electronic switch is controlled in a way that optimal capacitor values which are required to get maximum torque are obtained. In this work, a single phase induction motor with double capacitor and an adjustable switched capacitor under variable load conditions have been modelled and the simulation results for both capacitor conditions have been presented to compare their performances under transient and steady-state operations. Simulation results confirm the high performance operation of single phase induction motor with an adjustable switched capacitor.

   Operating Characteristics of Traction Asynchronous Motor
By Wagner J., Ráèek V.*, Kuchta J., Maga D., Štefula J. [View]
[Download]

Abstract: The analysis of operating characteristics of traction asynchronous motor will be described in the paper. Results obtained by classical approach, results based on mathematical modelling and measured results will be discussed and compared.

   Optimization of 3-Phase Squirrel-Cage Induction Motors Using Genetic Algorithm
By Miksiewicz R. [View]
[Download]

Abstract: Possibilities of use of genetic algorithm for optimization of a 3-phase squirrel-cage induction motor electromagnetic circuit are presented in the paper. The optimization problem with constraints is formulated when assuming the external penalty function. For the developed computer program using GA it is possible to select 8 design parameters and the multiobjective function. For the analyzed motor the region of feasible solutions (for two design variables) and chosen plots of the objective function are shown. The results of optimization calculations for the different quality criteria are presented. Process of optimization in the successive generations is shown as well. Basing on the results of many calculations for the same objective function the algorithm convergence satisfactory from the practical point of view stated.

   The Steady States Analysis of the Doubly-Fed Induction Motor (DFIM) with Matrix Converter
By Chekhet E., Sobolev V., Shapoval I. [View]
[Download]

Abstract: Doubly-fed induction motor (DFIM) in conjunction with AC-AC matrix converter is investigated. Venturini control algorithm for matrix converter is used. Steady states analysis of the DFIM with matrix converter is carried out. MC input current harmonic content is analysed. Modified MC control algorithm is proposed.

   Theoretical - Experimental Analysis of Periodic Running Machines Driven by Asynchronous Motor Fed by Inverter
By Cusimano G., Strada R. [View]
[Download]

Abstract: The paper presents an experimental analysis of the behaviour of an asynchronous motor fed by inverter and subjected to oscillating loads. The analysis results show a resonance phenomenon whose frequency and amplitude depend on the velocity of the motor. This behaviour is explained by the classical fifth order mathematical model of an asynchronous motor. The comparison between experimental and theoretical results shows that the behaviour of the motor is reproduced with high accuracy.

   Thermal Properties of a Frequency-Controlled Induction Machine under Condition of Energy Saving Work
By Gnaciñski P. [View]
[Download]

Abstract: One of possibilities of increasing efficiency of induction machines is lowering supply voltage when load torque is much less than nominal 3/4 energy sawing work. Energy saving work brings about reduction of energy consumption, lowering the temperature of windings, increasing reliability and the effective period of the machine operating. Thanks to reducing temperature of the isolation system the induction cage machine can carry higher overload torque without risking the isolation overheating. It is also possible to carry overload for longer period of time than in case of work with nominal flux. Thermal effect of energy saving work depends on thermal properties of the induction machine, which are different in case of a machine with outside ventilation and without additional ventilation. This paper is devoted to the comparison of the thermal effect of energy saving work on the motor with outside ventilation and without additional ventilation. The variable frequency of supply voltage was taken under consideration. The results of experimental investigations and computer simulations are presented for four-pole induction cage machines with the rated power of 2,2 kW and 3 kW.

EPE-PEMC 2000 - Topic 08a: Induction Motors and Drives
You are here: EPE Documents > 04 - EPE-PEMC Conference Proceedings > EPE-PEMC 2000 - Conference > EPE-PEMC 2000 - Topic 08: Electrical Machines and Actuators > EPE-PEMC 2000 - Topic 08a: Induction Motors and Drives
	[return to parent folder]

	Damping Torque-Oscillations at Drives with Double Cage Induction Machine By Tulbure A., Beck H.P.	[View] [Download]
Abstract: In the present paper a concept for damping of self-excited torsional oscillations in drive- systems with mains operated double-cage induction machines will be proposed. Considering the constructives parameters of induction machines (IM) and of load system the behaviour of the complet system has been simulated. The signal-waveforms will be compared with the experimental values. The strategy for active damping of torsional oscillations in the drive shaft bases on adaptive slip change of the induction machine. This task will be taken by the semiconductor-device assembled in the bottom-cage. The damping equipment makes possible a dynamic and low-loss adjustment of the characteristic curve of the motor. The simulations show that using the proposed strategy the magnitude of the torsional oscillations in the drive shaft can be reduced at about 50 %.

	Detection of Insulation Faults of Inverter-fed IM Drive By Chrzan P.J., Ronkowski M., Champenois G., Nieznañski J.*	[View] [Download]
Abstract: This paper deals with a method for monitoring unbalanced conditions in the squirrel cage induction machine resulting from short circuit of a coil in the stator-winding phase. Monitoring is carried out at standstill conditions during the initial process of self-commissioning of inverter-motor components before the start-up of the drive. The method is based on the parameter identification of one-axis induction motor model, which has been derived at dc excitation sequences. Series of electromagnetic parameters such as stator and leakage inductance, rotor time constant, stator resistance are identified by applying sigma-delta modulation of subsequent voltage vector positions along the machine air-gap circumference. Distribution of asymmetric parameters detects faulty conditions. Standard acquisition board with the aid of Matlab processing PC is used for experimentation.

	Identification and Non-linear Field Oriented Control of a Small Power Induction Machine By Pierquin J., Millet C., Bergmann C.	[View] [Download]
Abstract: The paper deals with the modelling and the control of a small power actuator. The effects of main flux saturation are discussed through the comparison of two models. The transient selected for the models validation is a no-load start-up. Finally, several strategies based on a non-linear field oriented control are presented.

	MMF of High Phase Order Induction Motors with Different Angles between Stator Windings and Supply Voltages By Grochowalski J.	[View] [Download]
Abstract: The problems of diminishing the pulsating torques in high power induction motor drives are investigated. This paper describes analysis and experimental results of MMF in 3 and 6 phase AC machines supplying by sinusoidal and nonsinusoidal currents. Analyses of 6 phase machines are for different angle between 3 phase stator windings and different time angles between currents in both 3 phase systems.

	Modelling and Simulation of a Single Phase Induction Motor with Adjustable Switched Capacitor By Sunter S., Ozdemir M., Gumus B.*	[View] [Download]
Abstract: This paper presents an effective model of a single phase induction motor with an adjustable switching capacitor. Using an adjustable switched capacitor connected in series to auxiliary winding is one of the methods to obtain maximum torque in the single phase induction motor. The duty period of the electronic switch is controlled in a way that optimal capacitor values which are required to get maximum torque are obtained. In this work, a single phase induction motor with double capacitor and an adjustable switched capacitor under variable load conditions have been modelled and the simulation results for both capacitor conditions have been presented to compare their performances under transient and steady-state operations. Simulation results confirm the high performance operation of single phase induction motor with an adjustable switched capacitor.

	Operating Characteristics of Traction Asynchronous Motor By Wagner J., Ráèek V., Kuchta J., Maga D., Štefula J.*	[View] [Download]
Abstract: The analysis of operating characteristics of traction asynchronous motor will be described in the paper. Results obtained by classical approach, results based on mathematical modelling and measured results will be discussed and compared.

	Optimization of 3-Phase Squirrel-Cage Induction Motors Using Genetic Algorithm By Miksiewicz R.	[View] [Download]
Abstract: Possibilities of use of genetic algorithm for optimization of a 3-phase squirrel-cage induction motor electromagnetic circuit are presented in the paper. The optimization problem with constraints is formulated when assuming the external penalty function. For the developed computer program using GA it is possible to select 8 design parameters and the multiobjective function. For the analyzed motor the region of feasible solutions (for two design variables) and chosen plots of the objective function are shown. The results of optimization calculations for the different quality criteria are presented. Process of optimization in the successive generations is shown as well. Basing on the results of many calculations for the same objective function the algorithm convergence satisfactory from the practical point of view stated.

	The Steady States Analysis of the Doubly-Fed Induction Motor (DFIM) with Matrix Converter By Chekhet E., Sobolev V., Shapoval I.	[View] [Download]
Abstract: Doubly-fed induction motor (DFIM) in conjunction with AC-AC matrix converter is investigated. Venturini control algorithm for matrix converter is used. Steady states analysis of the DFIM with matrix converter is carried out. MC input current harmonic content is analysed. Modified MC control algorithm is proposed.

	Theoretical - Experimental Analysis of Periodic Running Machines Driven by Asynchronous Motor Fed by Inverter By Cusimano G., Strada R.	[View] [Download]
Abstract: The paper presents an experimental analysis of the behaviour of an asynchronous motor fed by inverter and subjected to oscillating loads. The analysis results show a resonance phenomenon whose frequency and amplitude depend on the velocity of the motor. This behaviour is explained by the classical fifth order mathematical model of an asynchronous motor. The comparison between experimental and theoretical results shows that the behaviour of the motor is reproduced with high accuracy.

	Thermal Properties of a Frequency-Controlled Induction Machine under Condition of Energy Saving Work By Gnaciñski P.	[View] [Download]
Abstract: One of possibilities of increasing efficiency of induction machines is lowering supply voltage when load torque is much less than nominal 3/4 energy sawing work. Energy saving work brings about reduction of energy consumption, lowering the temperature of windings, increasing reliability and the effective period of the machine operating. Thanks to reducing temperature of the isolation system the induction cage machine can carry higher overload torque without risking the isolation overheating. It is also possible to carry overload for longer period of time than in case of work with nominal flux. Thermal effect of energy saving work depends on thermal properties of the induction machine, which are different in case of a machine with outside ventilation and without additional ventilation. This paper is devoted to the comparison of the thermal effect of energy saving work on the motor with outside ventilation and without additional ventilation. The variable frequency of supply voltage was taken under consideration. The results of experimental investigations and computer simulations are presented for four-pole induction cage machines with the rated power of 2,2 kW and 3 kW.