Summary 5. DYNAMIC MODEL OF AN INDUCTION MACHINE (original) (raw)

Models for induction machines with magnetic saturation of the main flux path

IEEE Transactions on Industry Applications, 1995

A new nonlinear TT model for an induction machine operating in magnetic saturation has been developed. It is based on a magnetic circuit model of a rotor-stator tooth pair, with nonlinear reluctance elements representing the saturation in the rotor and in the stator. The model of a tooth pair is extended to a model of the machine by assuming an infinite number of infinitesimal teeth. The model is compatible with the Blondel-Park transformation. Vxperimental measurements on a woundrotor machine validate the new model. Operating conditions for optimal efficiency at high torque levels requiring operation in saturation are computed.

Transient model of induction machine using rotating magnetic field approach

Mathematics and Computers in Simulation, 2010

Most simulation models of electric machines use the coupled circuit approach, where the machine is considered as an electric circuit element with time-varying inductances (abc model) or with constant inductances (dq0 model). On the other hand, the rotating magnetic field approach, which considers the electric machine as two groups of windings producing rotating magnetic fields and can give insight into internal phenomena of the machines, has not yet received much attention in electric machines modeling, especially for machine transient analysis. Based on the rotating magnetic field approach, this paper presents a transient model of the induction machine including main flux saturation effect. Based on the direct computation of the magnetizing fluxes of all machine windings, the model represents instantaneous main flux saturation by simply introducing a main flux saturation factor. No iteration process is involved to incorporate the saturation effects. The model combines the advantages of the dq0 and abc models advantages, such as rapid computation time and nonsymmetrical conditions simulation, respectively. The simulation results and the experimental tests show advantages and verification of the model.

The Induction Machine. Modelling and Simulation

2011

simulation analysis is made for various operating regimes of an asynchronous machine functioning at variable speed. In the first phase, machine parameters are introduced which the author concluded and the experimental information is combined with information from specialty books , through his own methods ,revealed at a previous chapter. We must keep in sight that when simulating an asynchronous machine in no-load mode we have three ways: without pelicular effect, with pelicular effect theoretically estimated and with pelicular effect experimentally estimated. Simulations can be done for a motor system or for a generator system, working with load, keeping track of time variation of the current, torque and speed. With the results gained we can obtain validity for the models( patterns) built Analyzing these simulations , we can highlight the influence of temperature over the evolution of current and pulses ,and also these aspects can be observed when considering the pelicular effect.

A Dynamic Model of Induction Machine

European Journal of Engineering Research and Science, 2019

In this paper, we study the construction, the equations and parameters of induction electrical machines, and also particularities of dynamic properties.

Rotordynamic Simulation Method of Induction Motors including the Effects of Unbalanced Magnetic Pull

IEEE Access

This paper presents an optimal method for rotordynamic simulation of induction motors, including the effects of unbalanced magnetic pull (UMP). The developed simulation method containing the UMP model is simple but still accurate for the actual design process of induction motors. The UMP model is simplified by using the magnetizing current without calculation of the rotor current. The effects of the slot opening and saturation are initially incorporated into the model by using the Carter factor. To improve the accuracy of the model, the magnetizing current is calculated by the finite element analysis (FEA), and the proposed correction factor is also built into the model. Moreover, mixed eccentricity is modeled and applied to the time step rotordynamic simulation for considering the actual rotor eccentricity condition. Based on the developed UMP and eccentricity models, rotordynamic simulation methods within the induction motor design process are proposed and tested in a standard four-pole induction motor. The simulation results show that inclusion of the UMP force reduces the critical speeds and generates electromagnetic excitation. The study further shows that the effects of UMP vary with a change in static eccentricity, dynamic eccentricity, slip, and bearing stiffness. Finally, based on the results, a utilization plan of the developed methods is proposed. INDEX TERMS Induction motor, mixed eccentricity, rotordynamics, unbalanced magnetic pull. NOMENCLATURE Bẟ Air-gap magnetic flux density C Damping matrix c Correction factor edy Amplitude of dynamic eccentricity emix Amplitude of mixed eccentricity est Amplitude of static eccentricity F Magnetomotive force Fg Gravity force matrix Fub Unbalance force matrix Fump UMP force matrix Fx Net UMP force in horizontal direction Fy Net UMP force in vertical direction G Gyroscopic matrix Im Magnetizing current K Stiffness matrix kC,s Carter factor for stator kC,r Carter factor for rotor kC,tot Total Carter factor Kump UMP stiffness matrix lst Stator stack length M Mass matrix N Number of turns in a winding n Degree of polynomial p Pole pair number q Displacement vector ̇ Velocity vector ̈ Acceleration vector r Air-gap radius wfν Winding factor t Time variable

Modelling of an Induction Motor

Induction Motor, Tesla, 2020

The report documents the modelling of a symmetrical, 4-pole, 1.5kW, 1725rpm motor with rated current at 6.1A and 230 line voltage. A dynamic transient analysis is conducted in this investigation by developing the machine equations such that a steady space model is formulated for a computer simulation The results of the model is compared to the steady state analysis model. The report concludes that the synchronous reference frame is the prime option to select for the control of an induction motor.

Induction Motor Control Theory

Induction Motor Design has a major effect on the behaviour and performance of an induction motor. Very often the details or class of design of a motor are not well understood or promoted.