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This paper presents a simple method to determine equivalent circuit parameters of double-cage Induction Motors (IM). A new formula to calculate the equivalent circuit parameters of double-cage IM is proposed. The formula is very simple so as to be able to calculate by a calculator but can determine the parameters of outer- and inner-cages bars accurately. In addition it is possible to take magnetic...
Efficiency of induction machines can be determined using international efficiency test standards such as the IEEE standard 112, IEC 60034-2-1 and JEC 37. The methods presented in these standards involve tests such as the no-load test, lock rotor test and a dynamometer test. Performing the no-load test is simple with fewer requirements in terms of equipment. The dynamometer test and the locked rotor...
Conventionally, Selective Harmonic Elimination (SHE) method in 2-level inverters, finds best switching angles to reach first voltage harmonic to reference level and eliminate other harmonics, simultaneously. Considering Induction Motor (IM) as the inverter load, and wide DC bus voltage variations, the inverter must operate in both over-modulation and linear modulation region. Main objective of the...
The fault detection of squirrel cage induction motors due to its importance in the industry has become a highly developed area of interest for researchers. Typically, the electrical machine is designed for stable operation with minimum noise and vibrations under normal conditions. When the fault emerges, some additional distortions appear. The necessity to detect the fault of an electrical motor in...
The canned solid-rotor induction motors with squirrel-cage (CSRIMSC) are widely used in petroleum, chemical and pharmaceutical fields. The equivalent circuit of the conventional induction motor is not suitable for CSRIMSC due to the special structure. In this paper, an analytical method of performance calculation for CSRIMSC is proposed. The effects of solid rotor and cans are considered. Besides,...
Medium-and high-voltage induction motors are widely used in industrial applications. Estimations of their operating currents are very much required for assessment of their steady-state performances. This paper presents a new analytical approach to estimate motor's slip-current curve from their technical catalog data. An accuracy of the proposed technique is validated by comparing the slip-current...
Estimation of induction machine equivalent circuit parameters which are commonly used in efficiency estimation and control methods can be effectively achieved by utilizing genetic algorithms (GA). One of the difficulties of using GAs for efficiency estimation is the determination of variable (parameter) constraints (ranges). A wide range of variables can cause unstable outcome. Hence, it is essential...
The presented paper deals with the calculation of the electromagnetic torque ripple waveform of an induction machine (IM) in steady state. The motor is supplied by non-harmonic voltages from semiconductor inverter. Mathematical model of the inverter is built on the base of complex Fourier series. Based on the mathematical formulas across the terminal inverter voltages a voltage spatial phasor is derived...
In this paper, a Particle Swarm Optimization (PSO) based, online equivalent circuit parameter estimation scheme for induction motor is proposed. This is a simple, online parameter estimation scheme utilizes only the online measured data and estimate the equivalent circuit parameters based on the Kirchhoff's laws. By identifying the change in equivalent circuit parameter values, we can have the idea...
An example of the design and implementation of the sensor vector control system with the synthesis of speed and current regulators for the induction motor, which can be used in laboratory and practical classes is considered. The structure of vector control system of induction motor with orientation on the vector of the rotor flux is proposed. Special attention is paid to the possibilities of using...
In this work, parameters of the equivalent circuit of a small induction motor with gearbox are experimentally extracted using standardized tests. Such parameters are used to formulate the nonlinear dynamic model of the motor in the d-q frame. To demonstrate the validity of the resulting model, a nonlinear multivariable sliding mode controller that uses the extracted parameters in its formulation is...
In this paper we estimate the effect of voltage unbalance on the losses in the core of the induction motor (IM). To measure losses in the core of the stator and the rotor, we used an IM with the rotor bars removed. We propose a test to estimate the equivalent resistance of the core losses and validate the results. We analyze the core losses for two severe voltage unbalanced conditions. The results...
In this paper the induction motor is modeled in order to analyze the steady state and transient behavior and assess the characteristics of the electromagnetic torque and efficiency depending on the load. The finite element method is applied for solving the magnetic field equations throughout the x-y plane of the machine, taking into account the physical characteristics of the induction motor and,...
A method for identification of induction motor parameters with the use of instantaneous power components balance equations is proposed in the paper. A dependence for nonlinear resistance in the rotor current function is obtained.
The determination of induction machine torque and current speed characteristics relies on methods based on either direct testing or calculation, using machine equivalent circuit. Both methods may lead to significant errors. The paper discusses the challenges encountered using these methods and an approach is presented in the paper to overcome the inherent challenges. The proposed approach considers...
This paper presents a methodology for obtaining the parameters of the equivalent circuit for an induction motor from the information on the nameplate and manufacturer catalog data sheet. The proposed method is straight and noniterative. The variation in rotor parameters for deep bars or double squirrel-cage rotors is modeled and presented as a function of the slip. The results of remarkable points,...
This paper presents a generalized d-q model of multiphase (six-phase) induction motor in Matlab/Simulink. Further, to observe the advantages of six-phase induction motor over conventional three-phase counterpart, a comparative analysis is performed under similar conditions. It has been observed that the six-phase induction motor have several advantages over conventional three-phase counterpart, such...
Asynchronous drives of centrifugal pumps are the most widely used types of electric drives applied in the industry and construction. The article researches dynamic characteristics of the induction motor — a centrifugal pump system composed of a set of interrelated and interacting subsystems of different physical nature. For study of the dynamics of the asynchronous electric drive, a mathematical model...
The mathematical models of the induction machine (IM) developed on the basis of the experimental frequency-response characteristics at standstill condition (SSFR) are proposed in this paper. At zero speed the transfer function of (IM) is used to obtain an exact linear parametric model. The latter ones are recommended for investigating the transient processes occurring at connections of (IM) to the...
The parameters of a permanent split-capacitor single-phase induction motor can be estimated by conducting the DC test, blocked rotor test and no-load test which later can be used to facilitate the prediction of motor torque-speed characteristics. To improve further its performance, an exact motor model is simulated and investigated in 2D finite element analysis under influence of different capacitor...
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