The Reactances of Synchronous Machines

Park, R. H.; Robertson, B. L.

doi:10.1109/t-aiee.1928.5055010

Cited by 95 publications

(21 citation statements)

References 7 publications

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“…It is sufficient to consider the basic equations of the mathematical description of an induction motor, which are used to compose vector control algorithms. So, to analyze the operation of an asynchronous motor, most specialists [1,3,4] use Park's model of a generalized electric machine [5].…”

Section: Main Partmentioning

confidence: 99%

Spectral Analysis of Rotor Currents in Frequency-controlled Electric Drives

Kodkin

Anikin

Baldenkov

2017

Proceedings of the 2017 2nd International Conference on Automation, Mechanical and Electrical Engineering (AMEE 2017)

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Abstract-The results of researches of asynchronous electric drives with the frequency control which are carried out for the purpose of establishment of causes and effect relationships between a control method, the implementable standard frequency converter of the Schneider Electric company (ATV-71, ATV-32) and its efficiency are given in article. Tests with asynchronous motors with wound rotor were for the first time carried out. It allowed registering during the experiments the instantaneous values not only the stator currents, but also rotor currents. Authors for the first time applied spectrum analysis of stator and rotor currents, it showed that «sensorless vector» control leads to origin of high-frequency harmonicas with the considerable amplitude and, as a result of they are non-sinusoidal of the created moment and inefficiency of the electric drive. The accelerations that are carried out during the researches to 94, 157 and 251 Rad/s confirmed this feature of vector control that appears incapable to linearize the asynchronous electric drive as it was supposed authors of a method. These results do not contradict theoretical provisions if not to neglect assumptions which usually become in case of an output of the equations of vector control. Unfortunately, the modern researchers do not subject these assumptions to doubts. Continued studies makes it possible to create an effective frequency management of asynchronous electric drives required for current technology.

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Section: Main Partmentioning

confidence: 99%

Spectral Analysis of Rotor Currents in Frequency-controlled Electric Drives

Kodkin

Anikin

Baldenkov

2017

Proceedings of the 2017 2nd International Conference on Automation, Mechanical and Electrical Engineering (AMEE 2017)

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“…1. There is a vector control, built on simplifications of the vector equations of an induction motor, described in detail in [1][2][3][4].…”

Section: Imperfection Of Vector Control Algorithmsmentioning

confidence: 99%

“…Scalar control, which forms the amplitude and frequency of the stator voltage of an electric motor, is considered by engineers and scientists to be "simple and reliable", but without any possibilities for accurate and fast regulation. To describe the performance in an electric drive with this control method, mechanical characteristics are usually used equivalent circuits and, less often, vector diagrams [1,2,4].…”

Section: Introductionmentioning

confidence: 99%

On the Physical Nature of the Problems of Frequency Control of Asynchronous Electric Drives

Kodkin¹

2020

Preprint

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The article proposes to consider the possibility of connecting the problems of engineering synthesis of frequency control systems for asynchronous electric drives with the basic provisions of the theory of identification of asynchronous electric motors based on the equations of a generalized AC electric machine.The article presents the results of experimental studies of load parrying processes in asynchronous electric drives with vector and scalar controls. These results indicate the absence of fundamental advantages as processes in a drive with vector control. This advantage should have manifested itself in a more efficient formation of the moment and fast transients. It is suggested that the reason for this is in too significant errors, assumptions and simplifications of the equations adopted in the derivation of vector control and which are its theoretical basis. A method is proposed for describing asynchronous electric motors by nonlinear transfer functions, which made it possible to formulate the principle of correction of electric drives and a method for assessing their efficiency.The article shows. that the correction based on the proposed nonlinear transfer functions of the induction motor is much more efficient than the traditional vector control, which was confirmed by detailed experiments and modeling. The results of the most important of which are given in the article. An assumption was made. that the advantage in efficiency is due to a more accurate identification of the dynamics of an asynchronous electric motor with a gear function instead of vector equations.

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“…These equations are standard forms in the literature (References [1,3,5,6,7]). The model used in this work differs from others in the choice of system variables and in the details of defining the inductance coefficients.…”

Section: R I +A Ft)mentioning

confidence: 99%