The Operating Characteristics of the Asynchronous Motor at the Rotorical Parameters Variation in Comparison with the Frequency (original) (raw)
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Simulation of dynamic modes in the asynchronous motor
Scientific journal of the Ternopil national technical university, 2019
The mathematical model of asynchronous three-phase motor, which takes into account the saturation of the magnetic system, is constructed in this paper. The system of differential equations of the electromagnetic state is formed in the normal Cauchy form. This form of equations presented in the matrix form is very convenient for numerical integration, since it is implemented by explicit methods that are simpler in computer realization than implicit ones. This approach makes it possible to describe the complex physical processes in the motors, namely the effect of saturation of the magnetic circuit and mechanical rotational motion. The use of the proposed model of the asynchronous motor, created by its real passport data, provides an opportunity for adequate real-time modeling. FORTRAN programming language and graphic editor GRAPHER are used to calculate dynamic regimes. The explicit Euler method is used for numerical integration of differential equations. The proposed model can be used to analyze the modes of operation of the motors as an autonomous element and an element of the electromechanical system. It is shown that this model corresponds to the classical theory of electric machines.
International Journal of Engineering Research and Technology (IJERT), 2014
https://www.ijert.org/analyzing-effects-of-varying-circuit-parameter-of-an-asynchronous-motor-on-its-dynamic-characteristics-using-matlab-simulink https://www.ijert.org/research/analyzing-effects-of-varying-circuit-parameter-of-an-asynchronous-motor-on-its-dynamic-characteristics-using-matlab-simulink-IJERTV3IS080698.pdf A poly-phase Asynchronous Machine-for instance Induction Motor, finds application in several areas due to its reliability. Around 90 per cent of the electrical motors used in industry and domestic appliances are either three-phase induction motors or single-phase induction motors. This Paper addresses the impact of stator and rotor parameters of an Three-Phase Induction motor on its dynamic characteristics using a MATLAB / SIMULINK based model. During start-up and other severe transient operations induction motor draws large currents, produces voltage dips, oscillatory torques and can even generate harmonics in the power systems. A Comparison is done taking different measures i.e. low level, medium level, high level of Parameters, this analysis helps in determining the stator and rotor circuit resistance and inductances to reduce steady state time and minimize jerks during starting of the motor.
The Study of Asynchronous Motors Behavior in Artificial Load
2014
The performances and heating of asynchronous motor are established to nominal load into a testing laboratory. Only in this way can be created real life working conditions, but there are also two big disadvantages: the need of applying a mechanical load to the shaft and the big energy consumption. Heating testing using this method is expensive and long lasting. That is why Ytterberg proposes a new method of heating test, the method of two frequencies, a synthetic form of charging. In this case, the asynchronous motor that is tested is not mechanically coupled, is powered from a network composed by a two different source of voltage and frequency which are electrically in series. Starting from machine parameters, trough numerical calculations, in the paper is established the correlation of frequency and voltage of the two sources to obtain current and the same losses as the nominal regime when the motors operates without load. The speed of asynchronous machine oscillates around the syn...
Equivalent Circuit Parameters and Operating Performances of the Three-Phase Asynchronous Motor
2010
Starting from usual rated data (ηn, αη,m, cosφ1,n, sn, mM), a simple and efficient procedure is proposed for identifying T-equivalent circuit parameters of three-phase asynchronous motor. Subsequently, by numerical solving of equivalent circuit, the operating performances of a three-phase asynchronous motor supplied from voltage or current sources, at constant or variable frequency, can be obtained. A numerical example (75kW, 1485 rpm asynchronous motor) confirms the validity of proposed method and the relatively good agreement between numerical and analytical characteristics.
Performance identification of the asynchronous electric drives by the spectrum of rotor currents
International Journal of Power Electronics and Drive System (IJPEDS), 2019
The efficiency of analyzing the rotor currents of asynchronous electric drives with frequency control is substantiated in the article. To assess the quality of torque generation in the engine it is suggested to use the spectral analysis of these currents and the fundamental harmonic, as the most accurate "conformity" of slip in an asynchronous motor. The proposed method showed that "sensorless vector" control leads to the appearance of highfrequency harmonics with significant amplitude. Because of these harmonics, a non-sinusoidal electromagnetic moment is created and the performance of the drive is decreased. The most effective method of torque generation is the frequency control with positive stator current feedback. This control is dominated by pronounced harmonic components, which indicates the proximity of this structure to linear and significantly better controllability of the drives, which makes promising their use in high-tech mechanisms, in particular, in industrial robots. Simulation and experiments confirm the proposed theoretical propositions.
IEEE Transactions on Industrial Electronics, 2011
The objectives of this paper arise through the investigation of a motor with a high starting torque, although with limited intensities, weak intensity variations depending on the load, controlled losses in no-load tests, and an acceptable performance in steady state, and with a good response in transient periods. All these requirements would have to be obtained without the help of power electronics; in this way, the motor would be more robust, longer lasting, and without the need for auxiliary equipment. In this paper, the operation principle, the characteristic parameters, and the obtained results for the spiral sheet motor are analyzed for three speed regimes, namely, 1000, 1500, and 3000 r/min. In addition, the spiral sheet motor is compared with the squirrel cage rotor, the solid rotor with rings, the wound rotor with additional resistances in the rotor circuit, and the hollow diamagnetic rotor.
4th IEEE International Symposium on Diagnostics for Electric Machines, Power Electronics and Drives, 2003. SDEMPED 2003., 2003
Campus de Viesques sln 33204 -Gijin, AsNrias, SPAIN htt~:llw~~\r.dimi~.unioriis h t t o . l l~~a w .~m i~v i . r~~~~~a~t~~~~~~t~~~l h~~t~~i Material Science and Metallurgic Engineering Dept. Campus de Viesques dn 33204 -Gijin, Astu"as, SPAIN Abslrocl-The rotor b a n of squirrel cage asynchronous motors arc subject to mechsnicnl forces and electrical and thermal trsnsi~nt processes. Duringthetrsnaicnl opration ofthemachine, apecinlly during its s u r l up, the high valnes o f c~r r e n t flowing through the cage produce small deformations in bar and end rings. These deformation$ combined with the crpsnrions and mmtrxtioms a w e d hy trmsient thermal procesm and the p~esenre of unavoidable manufanYring defects. l u d ID rotor bar fatigue. The ratigue 11arl1 with mill era& in the junction between rotor bar and endrings and ends with the complete breaking of the bars In lhk paper. the causes or fatigue in qnirrel'enge rotors are studied. By means of ~c~c r a l finite element models of low and medium voltage rnsehina the torres 'ppLied on thc rokx dvring mo(or 3tait up %re ~~h u l~f e d .
AC drives are commonly used in industries in many applications. Voltage and frequency can be varied with AC drives. DC voltage can be applied to the input of the inverter and it changes into AC voltage of essential voltage and frequency but there are certain limitations of total harmonic distortion and DC utilization. For improvement of voltage and current quality, pulse width modulation techniques are implemented. Sinusoidal pulse width modulation procedure is most mutual and very easy method for implementation but it has higher total harmonics distortion, lower DC utilization factor and incapable of over-modulation compared to other techniques. Space vector pulse width modulation technique has better output voltage and current quality. It has lower total harmonics distortion and higher DC utilization factor. In this paper, SPWM and SVPWM methods simulated and these two methods are implemented to an asynchronous machine connected with voltage source inverter and analyzed the performance. Voltage and current THD are shown. The simulation work is done in MATLAB / Simulink.
Harmonics asynchronous torques in wound rotor induction motor with frequency converter in the rotor
Mining and Metallurgy Engineering Bor, 2014
The subject of this paper is the harmonics asynchronous torqueses which appear due to the presence of high time harmonics in the voltage and current of wound rotor induction motor whose speed is regulated by frequency converter in the rotor circuit. Theoretical and experimental analysis was carried out in the case when the waveform of voltage, obtained from frequency converter, is rectangular.