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The stray flux that is present in the vicinity of an induction motor is a very interesting information source to detect several types of failures in these machines. The analysis of this quantity can be employed, in some cases, as a supportive tool to complement the diagnosis provided by other quantities. In other cases, when no other motor quantities are available, stray flux analysis can become one...
The equivalent circuit method is one of the promising methods for induction machine efficiency estimation. Conventionally, parameters of the machine are usually obtained from a no-load and lock rotor test. For in-service induction machines, performing these tests may not be possible without disrupting the machine operations. In this paper, a nonintrusive equivalent circuit based efficiency estimation...
Fault detection in induction motors in non-stationary regimes managed by inverters is an existing industrialized demand. Inverter-fed machines have being used due to their adjustable velocity and quick dynamic response, although the injection of objectionable frequency components. The condition monitoring of these motors can significantly reduce the cost of maintenance in the early detection of faults...
This paper introduces an alternative tool for stator current envelope extraction in induction motors (IMs) aiming for identifying broken rotor bar (BRB). A new timedomain signal processing algorithm using second order generalized integrator-adaptive notch filter (SOGI-ANF) is introduced for online extraction of both steady state and transient envelopes. The adaptive nature and the structural simplicity...
This paper introduces an alternative tool for stator current envelope extraction in induction motors (IMs) aiming for identifying broken rotor bar (BRB). A new time-domain signal processing algorithm using second order generalized integrator-adaptive notch filter (SOGI-ANF) is introduced for online extraction of both steady state and transient envelopes. The adaptive nature and the structural simplicity...
This paper investigates the effect of the rotor slots (bars) number of a three phase squirrel cage induction motor on the motor performance under broken bar fault condition. Two motors have been investigated at full load condition in healthy bars, one broken bar and two broken bars operations. The first motor has 24 stator slots and is investigated with rotor slots 20, 29 and 32 and the second motor...
Operation of a three-phase induction machine on single-phase supply has been an approach used for electromechanical energy conversion in rural communities with limited or no access to three-phase grid. Such single-phase to three-phase conversion can be achieved by passive and active means. In passive methods, fixed capacitors are used for starting and running the motor. Single-phase to three-phase...
The wound-rotor induction machine is capable of electromechanical energy conversion, if the stator and rotor windings are connected in series with a proper phase sequence. As a motor, the operation can be in one of two modes. In the first mode, the motor runs at exactly twice the synchronous speed for stable loading conditions. In the second mode, the motor runs at a speed below the synchronous speed...
Current analysis has been widely employed in academy and industry for the diagnosis of rotor damages in cage induction motors. The conventional approach based on the FFT analysis of steady-state current (MCSA) has been recently complemented with the development of alternative techniques that rely on the time-frequency analysis of transient quantities of the machine. These techniques may bring important...
In this paper a double hogger used in woodworking machines is considered. The machining tools are driven by induction machines operated by standard inverters. During production the load of these motors changes periodically between low load and high load at a given speed. This paper investigates the reduction of power losses in such an application using an appropriate energy efficient control strategy...
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...
This research represents a study of the effects of internal and external disturbances for the developed hybrid fuzzy-fuzzy controller (HFFC) scheme to gain control over the speed of an induction motor's (IM) variable speed drive (VSD). In case of an induction motor, the fuzzy current amplitude control and fuzzy frequency control are observed in a closed-loop current amplitude input model. A hybrid...
Loss minimization during transient operation is an often neglected in most induction machine applications. However, loss minimization can greatly improve efficiency in case of fast changing load torques or reference speed profiles. Optimal control theory has been successfully applied previously to develop control laws that minimize losses during transients. All previous works were based on the field...
This paper introduces a new method of fault diagnosis for induction motors, the Multilayer Park's Vector Approach, derived from the well-known fault diagnostic method based on Park's Vector Approach analysis. This new method allows the detection of failures in steady and transient regimes operation on induction motors. The resulting vector generated provides the information about deviations in the...
This paper represents a method for the designing and developing of a hybrid fuzzy-fuzzy control (HFFC) scheme to gain control over the speed of an induction motor (IM). The fuzzy frequency control and fuzzy current amplitude control are studied in a closed-loop current amplitude input model for an induction motor. A combination of both controllers forms the hybrid controller. The principle of HFFC...
This paper proposes a technique for the off-line estimation of the electrical parameters of the equivalent circuit of an Induction Machines (IM), and focuses on the application of an algorithm based on the minimization of a suitable cost function involving the differences between the measured stator current direct (sD) and quadrature (sQ) components and the corresponding estimated by the IM state...
Temperature effects on the performance of an Induction Motor (IM) and a Switched Reluctance Motor (SRM) is compared. Two Dimensional (2D) Finite Element Analysis (FEA) is used to calculate loss components in both motors at the same operating condition. A 3D FEA is then employed to calculate temperature rise in each motor. This has been used to update the material properties. Based on an iterative...
Motors used in industries are mainly induction motors. This is due to their high torque to volume ratio, ruggedness, robustness and low maintenance. Study of reference frames is essential for the analysis of transient behavior of induction machine. Steady state and transient behavior of squirrel cage induction motors is studied in stationary, rotor and synchronous reference frames under normal and...
This paper investigates the detectability of mechanical unbalance in double cage induction motor load using motor vibration signature analysis technique. Rotor imbalances induce specific harmonic components in electrical, electromagnetical, and mechanical quantities. Harmonic components characteristic of this category of rotor faults, issued from vibration signals analysis, are closely related to...
The incremental efficiency improvements achieved with induction motors have been mostly accomplished by adding material to the designs of the prior efficiency level. In order to achieve levels beyond NEMA Premium (or beyond lE3), it has been recognized that a different technology must be employed. The working groups for IEC efficiency levels have stated that inverter-fed permanent-magnet motors are...
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