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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...
This paper presents the use of a novel method dealing with mathematical morphology to de-noise spectral contents. This approach is based on two fundamental operators which are dilation and erosion. This type of filter does not need a huge computing time because the operations involved are simple. The goal of this filter in the application considered in this paper is to de-noise the spectrum of the...
This paper presents the experimental validation of a control reconfiguration method based on virtual sensors in order to implement a single and multiple current sensor fault-tolerant electric drive. The virtual sensors are generated from a bank of state observers based on the induction motor model in real time. These virtual sensors allow the use of a field-oriented control strategy even when one...
This paper presents a method of estimating the speed of an induction motor Luenberger. This method is based on speed sensorless estimation of vector controlled induction motor drive and adaptive control theory. A flux observer of an induction motor with a parameter adaptive scheme will be proposed. The parameters identified adaptively are stator and rotor resistance. A stability of the proposed adaptive...
In this paper, the dynamic strain measurement of a four-pole induction motor stator operating at 75% and 100% of the rated load is used to detect a broken rotor bar. Four fiber Bragg grating (FBG) strain sensors are installed inside the motor, between two stator teeth. Electromagnetic immunity and decreased size of the FBGs make them suitable for this application. When a broken bar is present, some...
Vector control of induction motor is preferred as it gives independent control of flux and torque. For vector control knowledge of flux and speed is required. To eliminate the sensors, observers are used to estimate the flux and speed rather than measuring it. Sliding mode approach is popular due to its robust nature and very suitable for nonlinear system. This paper designs a sliding mode observers...
A Matrix converter(MC) is a power converter that directly converts variable voltage variable frequency (WVF) without a direct current (DC) link. Some applied examples of motor drives that use a MC are elevator drives, wind power, and power sources of planes. This paper presents a vector control method and the basic characteristics of parallel-connected dual same rating induction motor drives that...
A new fault diagnosis scheme based on the monitoring of main air gap flux of the three phase squirrel cage induction motor is proposed. Most of the existing electrical techniques of condition monitoring are based on the stator current and/or leakage flux measurement outside the motor. Besides, most of these methods only concentrate on the time harmonics analysis of the acquired signal. We propose...
A new fault diagnosis scheme based on the monitoring of main air gap flux of squirrel cage induction motors is proposed. Most of the existing flux monitoring techniques are based on the leakage or stray flux measurement outside of the motor. A few methods, however, use the main air gap flux as the fault signature, where search coils are used to monitor the derivative of the flux, which eventually...
Generally, electric forklifts are equipped with a controller which works as an inverter that runs on battery power. The controller rotates induction motors for driving and lifting of a forklift. It also manages faults of a forklift: when a truck is under abnormal conditions, the controller is designed to stop the truck by reason of safety. Although most of the faults can be under control, the controller...
In this paper, we studied the vector control, by orientation of rotor-flux by using fuzzy regulators for an induction machine without speed sensor with adaptation of rotor resistance. The speed is estimated by using the adaptive method with model of reference (MRAS). This method consists in working out two models one of reference and the control adjustable one for the estimate of two components of...
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