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The paper presents a comparative analysis of a three-phase induction motor that operates connected to the industrial supply system and separately to a six-phase supply source, as well. The design of the electric machine is made in such a way to fit for both situations. The six-phase supply, which is composed of two distinct three-phase systems, was configured for two cases: 30° and 60° phase shifting...
This paper presents a derivation for the maximum transient current and torque peak values for small non-salient line starting permanent magnet synchronous machine (LSPSM) on base of permissible approximations. First the equations for locked rotor operation and secondly for constant speed operation are deduced. This paper is focused on derivation of the analytical calculation process to get an approach...
The present paper reports on electromagnetic modelling and transient analysis of a twelve-stator-pole, eight-rotor-teeth, three-phase switched reluctance generator (SRG) as the main part of a micro-wind energy conversion system. Since SRG performance depends on its control capability to minimize the electromagnetic torque ripple, the determination of optimal commutation pattern of SRG-side power converter...
To ensure the starting performance of the single-phase induction motor with three parallel-connected windings, the transient performances and starting methods are studied in this paper. At first, the transient mathematical model of the motor is established according to the electromagnetic relations, and the simulation analysis is performed. Then two starting methods are proposed and studied. The first...
There is need to develop fault detection techniques for reliable real-time diagnosis of axial-flux permanent magnet machines as they are now widely used in a variety of applications. Thus this paper presents detection techniques for interturn short circuit in an axial-flux permanent magnet machine based on a combination of torque and current monitoring using finite element analysis and experimental...
This paper addresses the design of an induction motor for electric vehicle applications. The motor is required to give very high transient torque during accelerations will being efficient under steady state operation. The paper discussed the required torque-speed envelope and develops a design which is suitable. The analysis techniques includes the use of a spreadsheet design package, a finite element...
The paper deals with the novel control system for five phase induction motor (IM) that enables the injection of the rotor flux 3rd harmonic component. Two multiscalar models are transformed from the α1−β1 and α2−β2 vector models developed in the 1st and 3rd harmonic planes. Based on the obtained multiscalar models the synthesis of dual multiscalar control is established. The obtained two multiscalar...
For predicting the performance characteristics of highly utilized induction machines, commonly finite element analysis (FEA) is applied. If only the stationary behavior is of interest, both time-harmonic and transient calculations are feasible. Both procedures offer benefits and drawbacks regarding precision and computing time. In this paper the stationary torque-slip-characteristic of a squirrel...
This paper investigates the three-phase symmetrical short-circuit characteristics of a permanent magnet synchronous machine (PMSM). Closed-form solutions are derived to predict both the steady-state and transient response of a PMSM to three-phase symmetrical short-circuit (SSC) faults. The developed expressions account for the impact of pre-fault operating conditions and include provisions for incorporating...
This paper describes a novel topology of soft starter for induction motors. Unlike the thyristerized soft starter, the proposed circuit configuration utilizes the self-commutated device to replace the thyristor as the switch on the supply line. The operating principle of the control system is analyzed. The transient process during starting has been studied using a presented mathematical model which...
This paper presents the transient behavior of a recently introduced configuration of a single-phase induction generator (IG) which employs a three-phase squirrel cage induction machine. One of the three windings of the machine is used for excitation control and active power control using a bidirectional power converter. The other two windings connected in series form the generator output to which...
A transient mathematical model of Smith single-phase capacitance motor was established, and the starting process of Smith single-phase capacitance motor was analyzed. Smith single-phase capacitance motors due to wiring constraints, the maximum voltage of each phase winding is 0.577 times the supply voltage, unique values capacitor starting torque when starting small, dual-values capacitor start can...
The paper comprehensively describes the simulation of a 1000kW/18900rpm wound-rotor synchronous machine (WRSM) by using the 2D transient finite element (FE) analysis method. The magnetic fields, the iron losses, the electromagnetic torque and the terminal characteristics of the prototype machine are investigated. The q-axis inductance Lq and the d-axis inductance Ld of the sample machine are predicted...
The starting current in high-power motor is very high, which will cause the voltage drop during start. Especially, with the smaller capacity of the source, the voltage drop in the grid is even more. In this paper, a new method for the simulation of the voltage drop in grid, caused by motor starting, is presented. Depending on the different start-up methods, the method determines the equivalent circuit...
In this paper an investigation of the synchronous machine behavior during a field short-circuit as the generator is connected to the 50 Hz grid is presented. The behavior analysis has been carried out using the Finite Element Method (FEM) for two cases. In the first one the rotor speed is held constant and equal to the synchronous one, while in the second case the rotor speed is controlled by a PI-controller...
This paper discusses the transients associated with line-starting of squirrel-cage induction motors and potential difficulties posed by these transients. These include transient torques significantly in excess of the rated motor torque, large inrush currents and corresponding large dips in voltage. Test results are presented which illustrate these problems. The paper then discusses various techniques...
A stator turn fault in a symmetrical three-phase machine cause a large circulating current to flow and subsequently generated excessive heat in shorted turns, generate irregular control current of the three phase leads to demagnetization. The demagnetization of PM occurred distortion of air-gap magnetic flux distribution caused deterioration of their torque, mechanical vibration etc. In this paper,...
This work presents a real time optimum flux adjustment fuzzy controller is cooperated with Direct Torque Control (DTC) adjustable speed drive (ASD) for ac Induction motors, in order to achieve the motor drive loss minimization while meeting the load and speed demands. The proposed control scheme includes a DTC controller, a speed controller and an optimum flux adjustment fuzzy control system. The...
This paper presents a novel dual-structure permanent magnet machine which has the distinct merits of having a compact structure with high power and torque densities. Sensorless control of this proposed machine at low speed and standstill is realized based on the indirect flux estimations by online reactance measurement (INFORM) method using transient finite element (FE) analysis. An external power...
This paper addresses the need for the utilization of cost effective, maintenance free electric machines in stand alone wind energy conversion system meant for rural areas. The suitability of switched reluctance machine as generator for stand alone rural wind energy conversion system has been explored through design and analysis. The design procedure, selection of pertinent topology, static and transient...
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