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A theoretical study of the electromechanical transient after switch-on at standstill of an induction motor with rotor asymmetry is carried out. Purpose of this study is to assess the influence of the motor parameters on the amplitude and the duration of the electrical and the mechanical transient. Subsequently the influence of the transient characteristics as well as of the applied current time-frequency...
An analytical investigation of the current transient after switch-on at standstill of an induction motor with rotor asymmetry is carried out in the present work. The purpose of this investigation is the calculation of the different current components and their evolution, especially of those that can be used for the detection of the asymmetry. Since fault detection methods based on transient analysis...
The knowledge of the inherent common-mode voltage of voltage source inverters and its impact on the mechanical drive train elements is an important issue. With the help of model-based calculations it is possible to identify critical operating points. In addition to the influence of the converter, different operating conditions such as speed and temperature have a main influence on the resulting discharge...
In the present work an analytical investigation of the behavior of the subsynchronous cascade drive at certain slip values is carried out, specifically at the multiples of 1/6. The drive behavior at these slip values has caused controversy among the researchers in the past. With the help of the space vector theory an analytical investigation is carried out which shows a specific synchronization of...
Voltage source inverters in electrical drive systems are the main sources of possible mechanical degeneration inside the anti-friction bearings of downstream drive train components. In order to find the right countermeasures to avoid these parasitic effects, knowledge of the switching conditions of the converter and the subsequent effects are an important issue. This paper focuses on the converter's...
This paper examines the influence of the motor pole pair number on the audible noise of electric motors for inverter operation. The number of pole pairs affects different parameters related to electromagnetic noise generation: the mode shape of the related force waves, the motor eigenfrequencies, the speed range where flux weakening is activated, as well as the frequencies of the radial force waves...
A new Standard that defines, for the first time, efficiency classes for converters and electric drive systems will take effect in 2014. This paper focuses on the drive system, which is referred to as Power Drive System (PDS) in the Standard. The paper also addresses the procedure for determining the drive system efficiency classes, referred to as IES classes, as well as the possible loss determination...
Broken rotor bar/ end-ring is a common fault in squirrel cage induction motors and has been thoroughly investigated in the case of AC grid supply. In this paper, this type of fault is studied in case of inverter driven motor. Induction motor is driven using scalar Volts/ Hz control method. Motor stator current and inverter input current spectra are studied for frequency components due to fault. Inverter...
This paper examines the torsional behaviour of the subsynchronous cascade drive. A four-mass model of the mechanical subsystem is considered in order to study the torsional oscillations of the shaft train due to the - characteristic for this drive - pulsation of the electromagnetic torque. A theoretical analysis is carried out and some guidelines are proposed regarding the design of the mechanical...
The issue of noise emission from electric drives is becoming increasingly important. Motor manufacturers have to comply with certain standards in order to assure the high competitiveness of their products. At the same time, with today's variable speed drives, which are supplied with non-sinusoidal voltages, the issue of noise reduction has become more complex. This is because the influence of additional...
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