... Bilal Akin is with ECE Depanment of Texas A&M University, Umut Orguner and Aydin Ersak ar... more ... Bilal Akin is with ECE Depanment of Texas A&M University, Umut Orguner and Aydin Ersak are with the Depamnent of Electrical and Electronics Engineering of Middle Easl Technical University (Comsponding author is B. Akin: bilalakin@ieee.org) ...
Abstract In this article, a novel criterion function is introduced to diagnose the breakage in ro... more Abstract In this article, a novel criterion function is introduced to diagnose the breakage in rotor bars of induction motors. This criterion function facilitates the precise diagnosis of the fault in induction motors under load variation. It uses wavelet transform to process the ...
The reference frame theory constitutes an essential aspect of electric machine analysis and contr... more The reference frame theory constitutes an essential aspect of electric machine analysis and control. In this study, apart from the conventional applications, it is reported that the reference frame theory approach can successfully be applied to real-time fault diagnosis of electric machinery systems as a powerful toolbox to find the magnitude and phase quantities of fault signatures with good precision as well. The basic idea is to convert the associated fault signature to a dc quantity, followed by the computation of the signal's average in the fault reference frame to filter out the rest of the signal harmonics, i.e., its ac components. As a natural consequence of this, neither a notch filter nor a low-pass filter is required to eliminate fundamental component or noise content. Since the incipient fault mechanisms have been studied for a long time, the motor fault signature frequencies and fault models are very well-known. Therefore, ignoring all other components, the proposed method focuses only on certain fault signatures in the current spectrum depending on the examined motor fault. Broken rotor bar and eccentricity faults are experimentally tested online using a TMS320F2812 digital signal processor (DSP) to prove the effectiveness of the proposed method. In this application, only the readily available drive hardware is used without employing additional components such as analog filters, signal conditioning board, external sensors, etc. As the motor drive processing unit, the DSP is utilized both for motor control and fault detection purposes, providing instantaneous fault information. The proposed algorithm processes the measured data in real time to avoid buffering and large-size memory needed in order to enhance the practicability of this method. Due to the short-time convergence capability of the algorithm, the fault status is updated in each second. The immunity of the algorithm against non-ideal cases such as measurement offset errors and phase unbalance is theoretically and experimentally verified. Being a model-independent fault analyzer, this method can be applied to all multiphase and single-phase motors.
... Bilal Akin is with ECE Depanment of Texas A&M University, Umut Orguner and Aydin Ersak ar... more ... Bilal Akin is with ECE Depanment of Texas A&M University, Umut Orguner and Aydin Ersak are with the Depamnent of Electrical and Electronics Engineering of Middle Easl Technical University (Comsponding author is B. Akin: bilalakin@ieee.org) ...
In this paper, two different nonlinear estimators applied to sensorless AC drives, Kalman filteri... more In this paper, two different nonlinear estimators applied to sensorless AC drives, Kalman filtering techniques (EKF and UKF) and model reference adaptive system (back emf and reactive power models), are discussed and compared to each other. Both of the observer types are studied and analyzed both experimentally and theoretically. In order to compare the observers precisely, the observers are tested under the identical conditions.
Abstract In this article, a novel criterion function is introduced to diagnose the breakage in ro... more Abstract In this article, a novel criterion function is introduced to diagnose the breakage in rotor bars of induction motors. This criterion function facilitates the precise diagnosis of the fault in induction motors under load variation. It uses wavelet transform to process the ...
In this paper, a direct torque control (DTC) scheme for permanent magnet (PM) synchronous motors ... more In this paper, a direct torque control (DTC) scheme for permanent magnet (PM) synchronous motors (surface-mount type) using cost-effective Hall-effect sensors for constant torque region is presented. Unlike conventional DTC proposed method estimates necessary quantities in the rotor reference frame by obtaining continuous position and speed information from the Hall-effect sensors resembling expensive high resolution position sensors (encoder and resolver).
The reference frame theory constitutes an essential aspect of electric machine analysis and contr... more The reference frame theory constitutes an essential aspect of electric machine analysis and control. In this study, apart from the conventional applications, it is reported that the reference frame theory approach can successfully be applied to real-time fault diagnosis of electric machinery systems as a powerful toolbox to find the magnitude and phase quantities of fault signatures with good precision as well. The basic idea is to convert the associated fault signature to a dc quantity, followed by the computation of the signal's average in the fault reference frame to filter out the rest of the signal harmonics, i.e., its ac components. As a natural consequence of this, neither a notch filter nor a low-pass filter is required to eliminate fundamental component or noise content. Since the incipient fault mechanisms have been studied for a long time, the motor fault signature frequencies and fault models are very well-known. Therefore, ignoring all other components, the proposed method focuses only on certain fault signatures in the current spectrum depending on the examined motor fault. Broken rotor bar and eccentricity faults are experimentally tested online using a TMS320F2812 digital signal processor (DSP) to prove the effectiveness of the proposed method. In this application, only the readily available drive hardware is used without employing additional components such as analog filters, signal conditioning board, external sensors, etc. As the motor drive processing unit, the DSP is utilized both for motor control and fault detection purposes, providing instantaneous fault information. The proposed algorithm processes the measured data in real time to avoid buffering and large-size memory needed in order to enhance the practicability of this method. Due to the short-time convergence capability of the algorithm, the fault status is updated in each second. The immunity of the algorithm against non-ideal cases such as measurement offset errors and phase unbalance is theoretically and experimentally verified. Being a model-independent fault analyzer, this method can be applied to all multiphase and single-phase motors.
In this paper, two different nonlinear estimators applied to sensorless AC drives, Kalman filteri... more In this paper, two different nonlinear estimators applied to sensorless AC drives, Kalman filtering techniques (EKF and UKF) and model reference adaptive system (back emf and reactive power models), are discussed and compared to each other. Both of the observer types are studied and analyzed both experimentally and theoretically. In order to compare the observers precisely, the observers are tested under the identical conditions.
... for Induction Machines Based on Advanced Digital Signal Processing Techniques Seungdeog Choi,... more ... for Induction Machines Based on Advanced Digital Signal Processing Techniques Seungdeog Choi, Student member, IEEE, Bilal Akin, Member, IEEE, Mina. M. Rahimian, Student Member, IEEE, and Hamid A. Toliyat, Fellow, IEEE M ... 60 -40 -20 0 Frequency Offset (Hz) dB lo ss ...
In this paper, a direct torque control (DTC) scheme for permanent magnet (PM) synchronous motors ... more In this paper, a direct torque control (DTC) scheme for permanent magnet (PM) synchronous motors (surface-mount type) using cost-effective Hall-effect sensors for constant torque region is presented. Unlike conventional DTC proposed method estimates necessary quantities in the rotor reference frame by obtaining continuous position and speed information from the Hall-effect sensors resembling expensive high resolution position sensors (encoder and resolver).
The performance of a synchronous reluctance motor (SynRM) depends on the direct-axis inductance (... more The performance of a synchronous reluctance motor (SynRM) depends on the direct-axis inductance (Ld) and the quadrature-axis inductance (Lq) of the machine. Increasing the saliency ratio Ld/Lq and making the difference between these inductances (Ld-Lq) large are well known methods for achieving high torque density and power factor. Placing the right amount of permanent magnets inside the rotor in the proper position will significantly improve the performance of this permanent magnet-assisted SynRM (PMa-SynRM). The PMa-SynRM offers higher power factor, which will reduce the size of the inverter. This study investigates the effect of Ferrite and NdFeBr permanent magnets on a 1.5kW SynRM, which has the capability of holding block shape magnets inside one of the rotor air barriers. Analytical analysis and finite element analysis (FEA) are used to compare the use of Ferrite against NdFeBr. Finally, the effects that using high or low cost magnets have on machine power factor and output performance have been studied.
... Bilal Akin is with ECE Depanment of Texas A&M University, Umut Orguner and Aydin Ersak ar... more ... Bilal Akin is with ECE Depanment of Texas A&M University, Umut Orguner and Aydin Ersak are with the Depamnent of Electrical and Electronics Engineering of Middle Easl Technical University (Comsponding author is B. Akin: bilalakin@ieee.org) ...
Abstract In this article, a novel criterion function is introduced to diagnose the breakage in ro... more Abstract In this article, a novel criterion function is introduced to diagnose the breakage in rotor bars of induction motors. This criterion function facilitates the precise diagnosis of the fault in induction motors under load variation. It uses wavelet transform to process the ...
The reference frame theory constitutes an essential aspect of electric machine analysis and contr... more The reference frame theory constitutes an essential aspect of electric machine analysis and control. In this study, apart from the conventional applications, it is reported that the reference frame theory approach can successfully be applied to real-time fault diagnosis of electric machinery systems as a powerful toolbox to find the magnitude and phase quantities of fault signatures with good precision as well. The basic idea is to convert the associated fault signature to a dc quantity, followed by the computation of the signal's average in the fault reference frame to filter out the rest of the signal harmonics, i.e., its ac components. As a natural consequence of this, neither a notch filter nor a low-pass filter is required to eliminate fundamental component or noise content. Since the incipient fault mechanisms have been studied for a long time, the motor fault signature frequencies and fault models are very well-known. Therefore, ignoring all other components, the proposed method focuses only on certain fault signatures in the current spectrum depending on the examined motor fault. Broken rotor bar and eccentricity faults are experimentally tested online using a TMS320F2812 digital signal processor (DSP) to prove the effectiveness of the proposed method. In this application, only the readily available drive hardware is used without employing additional components such as analog filters, signal conditioning board, external sensors, etc. As the motor drive processing unit, the DSP is utilized both for motor control and fault detection purposes, providing instantaneous fault information. The proposed algorithm processes the measured data in real time to avoid buffering and large-size memory needed in order to enhance the practicability of this method. Due to the short-time convergence capability of the algorithm, the fault status is updated in each second. The immunity of the algorithm against non-ideal cases such as measurement offset errors and phase unbalance is theoretically and experimentally verified. Being a model-independent fault analyzer, this method can be applied to all multiphase and single-phase motors.
... Bilal Akin is with ECE Depanment of Texas A&M University, Umut Orguner and Aydin Ersak ar... more ... Bilal Akin is with ECE Depanment of Texas A&M University, Umut Orguner and Aydin Ersak are with the Depamnent of Electrical and Electronics Engineering of Middle Easl Technical University (Comsponding author is B. Akin: bilalakin@ieee.org) ...
In this paper, two different nonlinear estimators applied to sensorless AC drives, Kalman filteri... more In this paper, two different nonlinear estimators applied to sensorless AC drives, Kalman filtering techniques (EKF and UKF) and model reference adaptive system (back emf and reactive power models), are discussed and compared to each other. Both of the observer types are studied and analyzed both experimentally and theoretically. In order to compare the observers precisely, the observers are tested under the identical conditions.
Abstract In this article, a novel criterion function is introduced to diagnose the breakage in ro... more Abstract In this article, a novel criterion function is introduced to diagnose the breakage in rotor bars of induction motors. This criterion function facilitates the precise diagnosis of the fault in induction motors under load variation. It uses wavelet transform to process the ...
In this paper, a direct torque control (DTC) scheme for permanent magnet (PM) synchronous motors ... more In this paper, a direct torque control (DTC) scheme for permanent magnet (PM) synchronous motors (surface-mount type) using cost-effective Hall-effect sensors for constant torque region is presented. Unlike conventional DTC proposed method estimates necessary quantities in the rotor reference frame by obtaining continuous position and speed information from the Hall-effect sensors resembling expensive high resolution position sensors (encoder and resolver).
The reference frame theory constitutes an essential aspect of electric machine analysis and contr... more The reference frame theory constitutes an essential aspect of electric machine analysis and control. In this study, apart from the conventional applications, it is reported that the reference frame theory approach can successfully be applied to real-time fault diagnosis of electric machinery systems as a powerful toolbox to find the magnitude and phase quantities of fault signatures with good precision as well. The basic idea is to convert the associated fault signature to a dc quantity, followed by the computation of the signal's average in the fault reference frame to filter out the rest of the signal harmonics, i.e., its ac components. As a natural consequence of this, neither a notch filter nor a low-pass filter is required to eliminate fundamental component or noise content. Since the incipient fault mechanisms have been studied for a long time, the motor fault signature frequencies and fault models are very well-known. Therefore, ignoring all other components, the proposed method focuses only on certain fault signatures in the current spectrum depending on the examined motor fault. Broken rotor bar and eccentricity faults are experimentally tested online using a TMS320F2812 digital signal processor (DSP) to prove the effectiveness of the proposed method. In this application, only the readily available drive hardware is used without employing additional components such as analog filters, signal conditioning board, external sensors, etc. As the motor drive processing unit, the DSP is utilized both for motor control and fault detection purposes, providing instantaneous fault information. The proposed algorithm processes the measured data in real time to avoid buffering and large-size memory needed in order to enhance the practicability of this method. Due to the short-time convergence capability of the algorithm, the fault status is updated in each second. The immunity of the algorithm against non-ideal cases such as measurement offset errors and phase unbalance is theoretically and experimentally verified. Being a model-independent fault analyzer, this method can be applied to all multiphase and single-phase motors.
In this paper, two different nonlinear estimators applied to sensorless AC drives, Kalman filteri... more In this paper, two different nonlinear estimators applied to sensorless AC drives, Kalman filtering techniques (EKF and UKF) and model reference adaptive system (back emf and reactive power models), are discussed and compared to each other. Both of the observer types are studied and analyzed both experimentally and theoretically. In order to compare the observers precisely, the observers are tested under the identical conditions.
... for Induction Machines Based on Advanced Digital Signal Processing Techniques Seungdeog Choi,... more ... for Induction Machines Based on Advanced Digital Signal Processing Techniques Seungdeog Choi, Student member, IEEE, Bilal Akin, Member, IEEE, Mina. M. Rahimian, Student Member, IEEE, and Hamid A. Toliyat, Fellow, IEEE M ... 60 -40 -20 0 Frequency Offset (Hz) dB lo ss ...
In this paper, a direct torque control (DTC) scheme for permanent magnet (PM) synchronous motors ... more In this paper, a direct torque control (DTC) scheme for permanent magnet (PM) synchronous motors (surface-mount type) using cost-effective Hall-effect sensors for constant torque region is presented. Unlike conventional DTC proposed method estimates necessary quantities in the rotor reference frame by obtaining continuous position and speed information from the Hall-effect sensors resembling expensive high resolution position sensors (encoder and resolver).
The performance of a synchronous reluctance motor (SynRM) depends on the direct-axis inductance (... more The performance of a synchronous reluctance motor (SynRM) depends on the direct-axis inductance (Ld) and the quadrature-axis inductance (Lq) of the machine. Increasing the saliency ratio Ld/Lq and making the difference between these inductances (Ld-Lq) large are well known methods for achieving high torque density and power factor. Placing the right amount of permanent magnets inside the rotor in the proper position will significantly improve the performance of this permanent magnet-assisted SynRM (PMa-SynRM). The PMa-SynRM offers higher power factor, which will reduce the size of the inverter. This study investigates the effect of Ferrite and NdFeBr permanent magnets on a 1.5kW SynRM, which has the capability of holding block shape magnets inside one of the rotor air barriers. Analytical analysis and finite element analysis (FEA) are used to compare the use of Ferrite against NdFeBr. Finally, the effects that using high or low cost magnets have on machine power factor and output performance have been studied.
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