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The paper presents thermal studies of three-phase induction motor during steady-state and transient regimes using Motor-CAD environment. The graphical interfaces for data input (motor geometry, materials properties) are also shown. The supposed duty cycles are S1, S2, and S3 (continuous, short-time and intermittent periodic duty respectively). As output data the temperatures for various motor parts...
The Hilbert Transform (HT) can improve the resolution of motor current signature analysis (MCSA), especially at very low slip, because it converts the supply frequency into a continuous component, which can be easily removed to better detect fault harmonics. This paper proposes its application also during speed transients, with two key advantages: first, it allows an easy filtering of the transient...
A new kind of induction motor with compound cage rotor(IMCCR) is developed in this paper, in which rotor bar is composed of upper part made of alloy material (conductor of electric and magnetic) and lower part made of cast aluminum. The transient heat conducting process of IMCCR running with discontinuous blocked rotor was studied, in which two different structure rotors were compared analyzed. The...
The Hilbert transform (HT) can improve the resolution of motor current signature analysis (MCSA), especially at very low slip, because it converts the supply frequency into a continuous component, which can be easily removed to better detect fault harmonics. This paper proposes its application also during speed transients, with two key advantages: first, it allows an easy filtering of the transient...
The article deals with optimal control problem of induction motor during starting process. The method of genetic algorithm is offered as method for solution of the problem. Application of this method in order to form starting process of the induction squirrel-cage motor is examined.
The harmonic and transient finite element method (FEM) are used to determine the starting and operational characteristics of a large induction motor (IM). The starting properties of the initially proposed motor are strongly degraded by parasitic asynchronous crawling tendencies and the motor is unable to achieve the nominal rotor velocity. It is shown in this paper that, when analyzing the IM using...
Field aligned starting (FAS) is a new technique for starting three-phase cage induction motors on single-phase supply lines with minimal inrush currents. It uses a simple energy storage system to generate a very high impulsive torque by which the motor is started before being connected to the mains supply. The spinning motor can then be connected to the mains to operate in a standard Steinmetz connection...
An analysis method for electromagnetic-thermal coupling field is proposed, and the whole region transient thermal field in an induction motor with rotor blocked is calculated. The equivalent thermal model of the mush stator windings is established, by means of which the calculation of the motor thermal field is easier and less time is need. Then the two dimensional numerical analysis models of the...
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