EPE Association: EPE 2005 - Topic 09-2: Induction machines

EPE 2005 - Topic 09-2: Induction machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 09: ELECTRICAL MACHINES > EPE 2005 - Topic 09-2: Induction machines

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   Additional losses in high speed induction machine - removed rotor test
By AOULKADI Mohamed; BINDER Andreas; JOKSIMOVIC Gojko [View]
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Abstract: The paper describes method for calculation of stator component of stray-load losses in a high-speed induction motor using removed rotor test. Specifically designed high-speed induction motor shows excessive losses already in removed rotor regime. The objective of the paper is to find the origin of such losses, calculate them and make a comparison with experimentally obtained results.

   Broken Rotor Bar Fault Detection in Induction Motors Using Starting Current Analysis
By GRAY Douglas A.; ERTUGRUL Nesimi; SUPANGAT Randy; HANSEN Colin; GRIEGER Jason; SOONG Wen [View]
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Abstract: Fault detection based on a common steady-state analysis technique, such as FFT, is known to be significantly dependant on the loading conditions of induction motors. At light load, it is difficult to distinguish between healthy and faulty rotors because the characteristic broken rotor bar fault frequencies are very close to the fundamental component and their amplitudes are small in comparison. As a result, detection of the fault and classification of the fault severity under light load is almost impossible. In order to overcome this problem, this paper investigates the detection of rotor faults in induction machines by analysing the starting current using a newly developed quantification technique based on the wavelet transform. The analysis technique applies the wavelet transform to the envelope of the starting current. The envelope extraction is used to remove the strong fundamental component, which overshadows the characteristic differences between a healthy motor and a faulty motor with broken rotor bars. The results are then verified using tests on a machine with a varying numbers of broken bars. The effects of initial rotor position, supply imbalance and loading are also investigated.

   MODELLING, SIMULATIONS AND EXPERIMENTAL TESTS OF AN INDUCTION MACHINE WITH ROTOR ASYMMETRIES
By CARDOSO FILHO Braz; BOREL Ugo; CARVALHO Leonardo; CUNHA Carla [View]
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Abstract: The need for detection of squirrel cage induction machines rotor faults at an earlier stage, so that maintenance can be planned ahead, has pushed the development of monitoring methods with increasing sensitivity and noise immunity. An important issue in such effort is the modelling of the induction machine including rotor bar and end-ring faults, with a minimum of computational complexity. In this paper, a simpler method is employed in the simulation and analysis of an induction motor with rotor asymmetries. Simulation, Finite Element Analysis and experimental results are presented to support the proposed approach.

   Power Error Vector Control for Doubly-Fed Induction Machine
By VILLATE Jose Luis; GABIOLA I.; MARTIN J. L. ; ANDREU J.; MARTINEZ DE ALEGRIA InIgo [View]
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Abstract: This paper discusses a new control method for variable-speed Doubly-Fed Induction Machine, Power Error Vector Control. The control does not depend on physical parameters of the machine and it has no need to tune parameters, so it is very simple, robust, and can be implemented in very short time. The application of different modulation strategies, namely Look-Up Table, Space Vector Modulation and PWM is presented. Simulation of the control when high variations of the physical parameters of the machine take place shows the robustness of the control method.

EPE 2005 - Topic 09-2: Induction machines
You are here: EPE Documents > 01 - EPE & EPE ECCE Conference Proceedings > EPE 2005 - Conference > EPE 2005 - Topic 09: ELECTRICAL MACHINES > EPE 2005 - Topic 09-2: Induction machines
	[return to parent folder]

	Additional losses in high speed induction machine - removed rotor test By AOULKADI Mohamed; BINDER Andreas; JOKSIMOVIC Gojko	[View] [Download]
Abstract: The paper describes method for calculation of stator component of stray-load losses in a high-speed induction motor using removed rotor test. Specifically designed high-speed induction motor shows excessive losses already in removed rotor regime. The objective of the paper is to find the origin of such losses, calculate them and make a comparison with experimentally obtained results.

	Broken Rotor Bar Fault Detection in Induction Motors Using Starting Current Analysis By GRAY Douglas A.; ERTUGRUL Nesimi; SUPANGAT Randy; HANSEN Colin; GRIEGER Jason; SOONG Wen	[View] [Download]
Abstract: Fault detection based on a common steady-state analysis technique, such as FFT, is known to be significantly dependant on the loading conditions of induction motors. At light load, it is difficult to distinguish between healthy and faulty rotors because the characteristic broken rotor bar fault frequencies are very close to the fundamental component and their amplitudes are small in comparison. As a result, detection of the fault and classification of the fault severity under light load is almost impossible. In order to overcome this problem, this paper investigates the detection of rotor faults in induction machines by analysing the starting current using a newly developed quantification technique based on the wavelet transform. The analysis technique applies the wavelet transform to the envelope of the starting current. The envelope extraction is used to remove the strong fundamental component, which overshadows the characteristic differences between a healthy motor and a faulty motor with broken rotor bars. The results are then verified using tests on a machine with a varying numbers of broken bars. The effects of initial rotor position, supply imbalance and loading are also investigated.

	MODELLING, SIMULATIONS AND EXPERIMENTAL TESTS OF AN INDUCTION MACHINE WITH ROTOR ASYMMETRIES By CARDOSO FILHO Braz; BOREL Ugo; CARVALHO Leonardo; CUNHA Carla	[View] [Download]
Abstract: The need for detection of squirrel cage induction machines rotor faults at an earlier stage, so that maintenance can be planned ahead, has pushed the development of monitoring methods with increasing sensitivity and noise immunity. An important issue in such effort is the modelling of the induction machine including rotor bar and end-ring faults, with a minimum of computational complexity. In this paper, a simpler method is employed in the simulation and analysis of an induction motor with rotor asymmetries. Simulation, Finite Element Analysis and experimental results are presented to support the proposed approach.

	Power Error Vector Control for Doubly-Fed Induction Machine By VILLATE Jose Luis; GABIOLA I.; MARTIN J. L. ; ANDREU J.; MARTINEZ DE ALEGRIA InIgo	[View] [Download]
Abstract: This paper discusses a new control method for variable-speed Doubly-Fed Induction Machine, Power Error Vector Control. The control does not depend on physical parameters of the machine and it has no need to tune parameters, so it is very simple, robust, and can be implemented in very short time. The application of different modulation strategies, namely Look-Up Table, Space Vector Modulation and PWM is presented. Simulation of the control when high variations of the physical parameters of the machine take place shows the robustness of the control method.