The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper formulates a steady state analysis of a Doubly Fed Cascaded Induction Machine and presents experimental results that validate the theory presented.
There are various methods to determine the efficiency of three phase induction machines. But all of them have in common that they are inaccurate or they are impracticable. In this paper the machine efficiency will be derived from start up data. For that purpose the time dependence of all stator currents and all stator voltages have to been measured. Normally it isn't possible to mount a speed sensor...
The experimental verification of the results of the mathematical analysis of a six-phase induction machine is presented in this paper. The verification is based on the measurement of the currents and torques at the feeding of stator winding by voltages which correspond only to a selected symmetrical component. The measured values are compared with the results of theoretical calculations. A single-phase...
The paper presents a application of wireless sensor network used to diagnose the efficiency of AC electrical machines. It explains the functions of the cell and the constraints which makes it a real tool for industry. The key point of the energy diagnosis consists in determining the electromagnetic torque in steady state, taking into account only the indications of the rating plate and without measuring...
A method for the determination and measurement of the real and reactive powers of multiphase electric machines is proposed using the geometrical algebra and the power invariant stationary reference frame transformations of the phase voltages and currents. Geometrical Algebra provides the expressions for the calculation of the powers. A four-wattmeter method to determine the active and reactive powers...
Different techniques for the asymmetries in the rotor of asynchronous machines in closed-loop controlled drives have been developed; they usually need to monitor currents and speed. This paper investigates the detection of rotor asymmetries in field oriented controlled induction machines based only on the measured currents and without the measurement of the speed. The paper uses the indicator for...
There are various methods to determine the efficiency of three phase induction machines. But all of them have in common that they are to inaccurate or they are impracticable. In this paper the machine efficiency will be derived from start up data. For that purpose the variation with time of all stator currents and all stator voltages have to been measured. Normally it isn't possible to mount a speed...
The aim of this paper is the analytical and experimental study of a gearbox by using the stator current signature analysis in the driving induction machines. The mechanical study using the vibration signal analysis has been well studied before. Recently, some works have been performed to observe the vibration components of the mechanical part in the stator current spectrum for an induction machine...
Field oriented control schemes may use different methods for the acquisition of the orientation angle and can operate with or without encoder. In this work the usual variants of field oriented control are implemented and the viability of making the detection and diagnosis of incipient rotor asymmetries in the squirrel cage of induction machines (IMs) is discussed. Then, the utilization of an online...
There are various methods to determine the efficiency of three phase induction machines. But all of them have in common that they are to inaccurate or they are impracticable. In this paper the machine efficiency will be derived from start up data. For that purpose the variation with time of all stator currents and all stator voltages have to been measured. Normally it isn't possible to mount a speed...
According to earlier work and papers by other authors, the main flux path of an induction machine is not only saturated due to the magnetizing current or, in other words, ldquothe magnetizing inductance can be modeled as a function of torquerdquo. In the paper a method is proposed to extend the induction machine's standard fundamental wave model taking into consideration the changes of the main inductance...
According to several papers, the main flux path of an induction machine is saturated not only due to the magnetizing current. Measurements and related parameter estimations show the influence of the torque building current component on the magnetization curves. The paper at hand presents 2D FEM calculations carried out in order to support and possibly verify the experimental investigations by means...
In this paper, a study of the influence of inter-bar currents on induction machines with aluminium and copper casted rotors is presented. The resistance between the rotor bar and the iron core is measured on five different rotors. An analytical model to predict the influence of inter-bar currents on machine performance is developed, and the results are verified by measurements. It is found that the...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.