A method for magnetizing curve identification in rotor flux oriented induction machines

Levi, E.; Sokola, M.; Vukosavić, Slobodan N.

doi:10.1109/60.866993

Cited by 73 publications

(34 citation statements)

References 15 publications

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“…5...8); -the difference between the torques measured in both situations becomes more significant when the rotor mechanical speed is increased (Figs. 6 and 7); -a small difference (lower than 1%) can be noticed between the torque estimated with (13) and the reference value.…”

Section: The Experimental Tests With the Dspace Platformmentioning

confidence: 88%

“…The scope of this technique is to improve the drive system's performances in this range of speeds for the control of torque. Additionally, in the flux weakening region, the performed control algorithm was modified such as to take into consideration the variation of inductance of magnetizing [13] and the adaptive field weakening [14]. The blocks 1 and 2 from …”

Section: Description Of the Indirect Vector Control Algorithm Conmentioning

confidence: 99%

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Indirect vector control of induction motors drive systems considering the iron loss resistance

Stanescu

Nicolae

Bojoi

2014

2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)

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The paper deals with a modality to perform indirect vector control while considering the iron loss resistance. Two cases are presented. In both of them the iron loss resistance is considered, but the first one considers the same value for the rotor time constant, whilst for the second one the rotor time constant is modified. A comparative analysis is made for the mechanic torque, when the speed is lower than the rated value. Through this control algorithm a reduction of the difference between estimated and measured torques while considering the iron loss resistance and a variation of the rotor time constant were realized. The experiments performed when the iron loss resistance was neglected and no adaptation of the rotor time constant was done revealed a difference of almost 10% between the values of the measured torque and the reference torque for the analyzed drive system. This difference is practically twice higher than that obtained for the other cases analyzed in this paper. Starting from the mathematic equations [1], [2] of the induction motor written in the rotor flux frame one conceived a torque control algorithm in order to optimize the indirect vector control while taking into account the iron loss resistance (for iron losses compensation) and an adaptation of the rotor time constant. The studies and experimental tests were focused on the operation in stationary regime in the zone with speeds lower than the rated ones (four tests were made). Through the iron losses compensation and rotor time constant adaptation a reduction of the difference between the estimated and measured torques were noticed.

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Section: The Experimental Tests With the Dspace Platformmentioning

confidence: 88%

Section: Description Of the Indirect Vector Control Algorithm Conmentioning

confidence: 99%

Indirect vector control of induction motors drive systems considering the iron loss resistance

Stanescu

Nicolae

Bojoi

2014

2014 International Conference on Optimization of Electrical and Electronic Equipment (OPTIM)

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“…The main drawback of this method is that it is not suitable for the self-commissioning scheme. The method presented in [9], which deals with the parameter identification of the analytical inverse magnetization curve implemented in the control system, requires that the machine is not coupled to the load and that the voltage measuring equipment is available. A newer paper dealing with the self-commissioning at standstill does not deal with the magnetization curve at all [10].…”

Section: Introductionmentioning

confidence: 99%

Magnetization Curve Identification of Vector-Controlled Induction Motor at Low-Load Conditions

Terzić

Despalatović

Slutej³

2012

Automatika

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Original scientific paperIn many drives the induction motor torque is transferred to the load through complex mechanical connections which produce an initial load. In such cases, to identify the magnetization curve by the no-load test it is necessary to decouple the motor from the transfer gear what is expensively and time-consuming. In an attempt to avoid the motor mechanical decoupling in the case of hoist crane systems, in this paper a method is proposed for the magnetization curve identification of the indirect rotor flux oriented (IRFO) induction machine at low-load conditions. Two flux controllers with estimated feedback quantities are added to the basic structure of the IRFO control drive. One of these controllers is used to control desired operating point on the magnetization curve and the other for on-line adaption of the reference frame position. The proposed algorithm is implemented in a commercial drive as a part of the self-commissioning module. Afterward, the magnetization curve of the 22 kW induction motor was identified and compared with the one obtained by the no-load test. The method sensitivity to the load torque and the transient inductance has also been considered. Key words: Induction motors, Magnetization curve, Parameter estimation, Vector controlOdredivanje krivulje magnetiziranja vektorski upravljanog asinkronog motora kod malih opterećenja. Brojni su primjeri pogona u kojima se moment asinkronog stroja prenosi na radni mehanizam preko mehaničkih reduktora koji mogu predstavljati značajno opterećenje motoru i u režimu neopterećenog pogona. Da bi se u takvim slučajevima odredila krivulja magnetiziranja iz pokusa praznog hoda nužno je odspojiti motor od reduktora što je skupo i vremenski zahtjevno. U pokušaju da se izbjegne mehaničko odspajanje motora kod dizaličnih sustava, u ovom je radu predložena metoda za odredivanje krivulje magnetizranja vektorski upravljanog asinkronog motora kod malih iznosa opterećenja. Dva regulatora ulančenog toka s estimiranim veličinama u granama povratne veze dodani su osnovnoj strukturi vektorski upravljanog pogona. Jedan od regulatora koristi se za upravljanje željenom radnom točkom na krivulji magnetiziranja dok se drugi koristi za podešavanje referentnog položaja vektora toka rotora. Predloženi algoritam implementiran je u komercijalnom uredaju kao jedan od samopodešavajućih modula koji se koriste prilikom puštanja u rad pogona. Nakon toga je opisanim postupkom odredena krivulja magnetiziranja 22 kW asinkronog motora i usporedena s krivuljom dobivenom iz klasičnog pokusa praznog hoda. Takoder je razmotrena i osjetljivost metode na iznos momenta opterećenja i tranzijentnog induktiviteta.

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“…There were another group of researches being emphasized on the consideration of magnetic saturation effect and its compensation control. In the research conducted in [7], an inverse magnetizing curve is identified and applied for performing the field-orientation control. As the control scheme developed in [8], a programmed magnetizing current considering the saturation effect and current and voltage limits over wide field-weakening range is employed to obtain maximum torque.…”

Section: Introductionmentioning

confidence: 99%

On the Control of a Field-Weakened Induction Motor Having Improved Transient and Static Performances

Huang

Liaw

2004

Electric Power Components and Systems

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The field-weakening control of an indirect field-oriented (IFO) induction motor (IM) drive with good dynamic and static performances is studied. First, the operating characteristics of an IFO induction motor drive under conventional field-weakening control are studied to comprehend its limitations. In the proposed field-weakening control scheme, the normal d-axis flux current command is the first set. It consists of a major component generated based on conventional 1 /ωr approach and a loading compensating component. Then the normal command is augmented with transient and static compensating components to automatically further improve its defects. During the transient period, the former component is generated from the torque current tracking error and added to adaptively further adjust the field such that the current tracking control performance is improved; hence, the transient torque generating capability is also enhanced accordingly. Finally, a robust current controller and a detuning compensator are developed to enhance the current tracking performance of a detuned induction motor. As the transient is elapsed and enters the static period, the static compensating flux current command is tuned using the proposed intuitive approach to let the motor quickly reach a stable condition having better static torque generating capability, thus the energy conversion efficiency is improved. Effectiveness of the proposed field-weakening control method is demonstrated experimentally.

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A method for magnetizing curve identification in rotor flux oriented induction machines

Cited by 73 publications

References 15 publications

Indirect vector control of induction motors drive systems considering the iron loss resistance

Indirect vector control of induction motors drive systems considering the iron loss resistance

Magnetization Curve Identification of Vector-Controlled Induction Motor at Low-Load Conditions

On the Control of a Field-Weakened Induction Motor Having Improved Transient and Static Performances

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