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This paper proposes an analytical method to quantify the effects of current and position sensor errors on torque ripple of a switched reluctance machine (SRM). First, an instantaneous torque equation for SRM is derived using the Fourier series representation. Then, analytical models are developed to describe the non-idealities of current and position sensors in the drive system. The electromagnetic...
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...
In condition monitoring of electrical machines, wireless sensors enables access to internal signals that are relatively unexplored compared to the conventional external measurements. This paper demonstrates the application of wireless sensor to measure the rotor field winding current in a Brushless Synchronous Generator and compare the fault detection capability with the stator exciter field current...
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...
To obtain a good dynamic control performance of permanent magnet synchronous motor (PMSM) drives, four sensors (one position, one DC-link voltage and at least two current sensors) are required for the control-loops. This paper deals with the unpredictable faults that occur in any one of the sensors using an advanced fault-tolerant control (FTC) scheme to provide continuous drive operation. The proposed...
SRM is widely used in Electric vehicle applications due to its high starting torque, wide range of variable speed operation and independent phase control. For the work in this paper, we have extended the models in Powersim (PSIM) to include 12/8 Switched Reluctance Motor (SRM) and its drive and have implemented the control parameters with focus on energy efficiency, drive complexity and control characteristics...
This paper shall present the design, simulation and implementation of a sensorless observer for three-phase permanent magnet synchronous machines which can be used for automotive steer-by-wire applications. The observer tracks steering transients enabling the sensorless speed/position estimates to be used for backup in case of encoder failure. The sensorless method is based on a high frequency injection...
In this paper, a novel Multivariable Sliding-mode Extremum Seeking (MSES) Proportional-Integral (PI) tuning method is proposed and its application is studied for torque control in a Permanent Magnet Synchronous Motor (PMSM). To this end, the stator three-phase currents are characterized by their maximum amplitude which directly controls the shaft torque. Hence, a PI controller is applied for controlling...
The peculiarities of formation criteria, which provide adequate description of images was considered. The feature of vector-rotor functioning and invariance in special points and segment were investigated. It was received the algebraical expressions for determination of step vector as under direct action of rotor. The obtained results of modeling and investigation of values coefficients of compression...
This paper proposes Fault Detection, Isolation and Reconfiguration (FDIR) techniques to realize the connection of a DFIM pumped storage system with the grid in the presence of current and speed sensor failures. For the detection method authors use the parity space approach either for current sensor failure or the rotation speed one. The proposed reconfiguration techniques exploit stator flux estimation...
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...
Active magnetic bearings (AMBs) provide a new proper solution to the high-performing rotating equipment. The active controlled electromagnetic forces of AMBs levitate the rotor without any contact with the stator. The advanced controller design is one of the hot issues associated with AMBs. This paper deals with the application of μ synthesis to the control of AMBs. The parametric uncertainty of the...
Induction motors (IMs) provide the driving force for the industry. A kurtosis energy based spectrum synch (KESS) technique is proposed in this work to detect incipient IM broken rotor bar defect using electric current signals. In IM fault detection, the proposed KESS technique will capture the peakedness of the fault frequency components distributed over several fault related local bands. These bands...
In this paper, energy harvestation and its effective utilization by regenerative braking and motoring modes of operation of a PMBLDC drive system with varying load is discussed. PMBLDC drive is a permanent magnet machine, widely used because of their high power density and efficiency; so it is proposed in both motoring and regenerative modes of operation. In motoring mode, drive consumes electrical...
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...
Gyrowheel is a unique attitude control device to measure external rates of the spacecraft body as well as provide momentum control. To ensure the external rate sensing accuracy of Gyrowheel, study of the accurate characterization of the currents in the torque coils is performed in this paper. Components of the current signals and the sources of them are analyzed, and an effective filtering method...
Use of a rotor type UAV that can perform three-dimensional movement and hover is being actively pursued. Although a multi-rotor type UAV is important, because it is driven by electric motors its application has the limitation of a short cruising time. In this study, the composition and control system of a single rotor UAV that achieves attitude control by pivotable vertical fins are proposed. Herein,...
In this paper, a novel compensating method of the misalignment effect of hall sensors for brushless DC (BLDC) motor drives is proposed. The discrete Fourier transform (DFT) is applied to obtain the magnitude of the fundamental frequency component which is proportional to the interval between two adjacent hall-sensor signals, from which the relative misalignment error is identified. In addition, the...
This paper presents an approach to estimate wind vector for a micro UAV by using only its inertial measurement unit in real-time. This method does not need additional sensors and dedicated anemometer, while just relying on the onboard inertial measurement unit to reserve the valuable payload for other onboard sensors. A smoothing filter is also designed based on the minimum summation of distance vector...
This paper improves the permanent magnet (PM) machine position sensorless drive specifically for high speed operation. To obtain the rotor position, an approximation is typically assumed on the position estimator where the estimated position is almost equal to the actual position per sample instant. This small signal approximation might not be valid at high speed when the ratio of sampling frequency...
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