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In this paper there is detailed the asynchronous operation caused by an important overload, of a synchronous motor. There are mentioned the currents of all the windings, main flux, electromagnetic torque, electrical angular speeds of the rotating field and of the rotor which define the amplitudes of the electrical, magnetic and mechanical stresses. The effect of the damping windings resistance in...
This paper emphasizes technical and economic parameters at direct-on-line starting of low power asynchronous motors. There are presented a lot of simulations and there are carried out experimental tests, in order to establish deviations which occur between the two methods. On the basis of the mathematical model presented, it is also possible to study other dynamic states: variation of voltage, of...
Advance in high-tech industries is due to evolution, respectively performance of electrical machines. Worldwide, designers are concerned to find answers to current questions such as: performance growth of asynchronous motors, reduce manufacturing and operating costs by adopting solution in line with global optimization approaches. Condition imposed to asynchronous motor design is limited startup current...
In this paper there is analyzed the dynamic behavior of a reluctance synchronous motor with continuous rotation in case of supply to a vector-control converter. In this purpose a simulation program has been conceived; it is based on the motor equations written in the two-axis theory. The model used is an original form, with combined variables. It can be used for any type of synchronous machine. The...
In this paper there is established the hybrid mathematical model of permanent-magnet synchronous machine. This is a useful instrument in the design stage, for identifying the effect of parameters upon the behaviour in dynamic processes and for completing the electromagnetic and constructive solution.
In this paper there is presented a method for analyzing dynamic regimes of asynchronous machines, by using the equations with saturation, which have the stator current and the rotor flux as state variables. In the first part, this mathematical model is detailed. There are presented below a series of simulations obtained by means of some Matlab programs carried out starting from this model. The simulations...
This paper presents a few aspects regarding the modelling, simulation and monitoring of dynamic regimes for asynchronous motors. There are presented the two-axes mathematical model of these motors, the Simulink simulation program, the simulation results for the case of direct on-line starting, as well as a few experimental results (which confirm the simulations). The research originality derives from...
In this paper there are presented a series of dynamic regimes obtained for the case when some disturbances occur during the operation of a reluctance synchronous motor operation: the decrease of the sinusoidal supply voltage value and the supply by a non-sinusoidal source of voltage (indirect voltage and frequency converter voltage source with PWM command and voltage inverter with pre-computed moments...
This paper presents a Matlab program for the simulation of the direct-on-line starting of a three-phase asynchronous motor. The program, conceived on the basis of the mathematical model written in the two-axes theory, allows to study the influences of the inertia moment and resistant torque upon the dynamic regime analyzed. To confirm these simulations, there has been used a data acquisition system...
The objectives followed in the frame of this paper are to approach comparatively, from the view point of the operation performances and exploitation costs obtained for two types of motors (asynchronous motor and permanent-magnet synchronous motor), by means of some specialized computation soft-wares. Because of the drawbacks of asynchronous motors (high shock of starting current, relatively low power...
This paper analyzes some transient processes specific to high voltage electric networks. There are followed especially the electric stresses in disconnecting shunt reactors. Analytical and numerical determinations are taken into account. The simulations confirm the analytical conclusions.
Very important are the energy analyses at the rheostatic starting of the existing wound rotor three-phase asynchronous motors, used for driving the long belt-type carriers, which have a difficult and long-duration starting. A factory producing static converters proposes to the customer a modernization of the starting by using a single-phase rheostat and a three-phase bridge in the rotor. That is why,...
This paper presents aspects regarding the saturation influence upon the operation of the reluctance synchronous motors in case of some representative dynamic regimes. In this purpose, there have been detailed the mathematical model and the Matlab model conceived with its help. There are also presented the simulations obtained for a few concrete situations. The paper ends with experimental results...
The dynamic properties of back-to-back single supply high power salient poles synchronous machine are analyzed by modeling and simulation. The considered mathematical model is convenient for high power salient poles synchronous machines. The dynamic electromagnetic torques and windings currents where particularly considered. Of a special concern is also the steady state operation. This issue is of...
This paper presents a method for the squirrel cage asynchronous motors parameters determination, which is the object of a invention proposal. The method involves monitoring a direct-on-line starting and processing, by minimizing an objective function, the data recorded during starting. There are also presented the experimental results obtained, with accent on the synchronization device, which is the...
The lately important development of some high precision electrical drives with great response speed, as well as the fact that the electrical machines exploitation is closer and closer to limit of stability have led to intense preoccupations, in the whole world and in our country, for the precise determination of the asynchronous motors parameters and the operation characteristics. This paper has got...
The paper analyzes a nowadays problem, the stability of the systems consisting in voltage and frequency static converter with direct current intermediary circuit — induction motor. In this purpose, there has been established the operational mathematical model obtained from the two-axes theory equations. This model has been used to conceive a Matlab program used for the stability analysis by the method...
This paper analyzes the dynamic stability of a reluctance synchronous motor rated at 1,5 kW by means of some simulations in dynamic regime. For doing this, there are presented the two axes theory mathematical model of the motor, the Matlab-Simulink program conceived with the help of this model and the simulations that have been obtained this way. Two of the most common possible disturbances are considered:...
This paper presents a series of transient regimes specific to the reluctance synchronous motors operation. There are detailed the used mathematical model, having the currents and the speed as state variables, the Matlab-Simulink model obtained on the basis of these equations, the simulations obtained in the case of the asynchronous starting and when some torque and voltage disturbances occur. Finally,...
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