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This paper proposes a comprehensive approach for the multi-objective design optimization of switched reluctance machines (SRMs). An analytical model that predicts the electromagnetic (EM) behaviors of SRMs with arbitrary geometries, materials or current profiles is first developed and validated by its finite-element analysis (FEA) counterpart in terms of various performance indices. Then, a hybrid...
The induction motors are widely used in different industry areas which can experience various kinds of faults in stators and rotors. In order to early diagnose motor faults, the classical condition monitoring method focusing on stator current spectrum is well researched and presented. There are already some review papers related to traditional current monitoring method. However, when it comes to the...
Interior permanent magnet synchronous machine drives are widely employed in electric traction systems and various industrial processes. However, prolonged exposure to high temperatures while operating can demagnetize the permanent magnets to the point of irreversible demagnetization. In addition, direct measurements with infrared sensors or contact-types sensors with wireless communication can be...
This paper proposes an enhanced approach to estimate the stator winding temperature based on active DC flux injection for induction machines with two representative direct torque control (DTC) schemes, the conventional hysteresis-based DTC and the deadbeat DTC. In this method, the stator resistance is regarded as the indicator of its temperature, and is estimated by applying offsets to the flux controllers...
This paper presents an analytical method to calculate the unsaturated direct (d) and quadrature (q) axis magnetizing inductance of synchronous reluctance machines (SynRMs). The d-axis magnetizing inductance is calculated by conformal mapping and solving partial differential equations of magnetic potentials, while the q-axis magnetizing inductance is solved from a magnetic equivalent circuit (MEC)...
The strong leakage magnetic flux in the end region of large synchronous generators results in significant eddy currents in the end components which can possibly lead to overheating thus threatening the safe operation of large generators and is an essential issue at the design stage. The press plate is a major end component of large generators that fastens the stator end-core packets and shields the...
Switched reluctance machines (SRMs) are gaining interest in the industry and scientific communities owing to the advantages of rigid structures, high reliability, the absence of permanent magnets, robustness, fast dynamic response, and low manufacturing cost. They have become a feasible alternative to conventional electric machines with variable speed drives in many applications. This paper presents...
The large torque ripple of a switched reluctance machine (SRM) caused by commutation and the inherent nonlinear torque-producing nature is a major disadvantage for its widespread application. To mitigate this problem, current profiling for torque ripple minimization has been extensively pursued, however, most current profiling attempts are performed on existing SRM designs and thus will not guarantee...
Predicting the distribution of the eddy currents circulating in the press plate or other end metallic components and the impacts of eddy current on the magnetic field in the end region is crucial for the design of large synchronous generators. Compared to the accurate but extremely time-consuming full three-dimensional (3D) finite-element analysis (FEA) that may take several days to complete, a new...
Interior permanent magnet synchronous machine drives have widespread applications in electric traction systems and various industrial processes. However, prolonged exposure to high temperatures while operating can demagnetize the permanent magnets to the point of irreversible demagnetization. In addition, direct measurements with infrared sensors or contact-type sensors with wireless communication...
This paper proposes a fast and generalized multi-objective design and optimization method for the Switched Reluctance Machines (SRM). An analytical design model for SRMs with any feasible stator and rotor slot combinations is firstly developed, which can accurately evaluate a SRM design much faster than the prevalent finite element analysis (FEA) method. In addition, a novel method for multi-objective...
The significant losses in the end components due to the leakage magnetic field excited by the armature and field end windings can result in partial overheating and is an important consideration in the design of large synchronous generators. This paper describes an approach based on the three-dimensional (3D) transient finite element analysis (FEA) to determine the fields and losses in the generator...
This paper proposes a generalized staircase modulation method for modular multilevel converters (MMCs). Compared to high-frequency modulations, the staircase modulation has a lower switching frequency and losses, and lower dV/dt stresses for power electronics devices. By using Karush-Kuhn-Tucker (KKT) conditions, this paper proposes a method with rigorous proof to calculate the switching angles that...
Accurate calculation of the phase inductance profile of switched reluctance machines (SRMs) is of crucial importance in SRM design because it is a key parameter to predict the performance indices such as the torque and core loss. Instead of using the time-consuming finite element analysis (FEA) or the methods that require prior knowledge of magnetic fields from an FEA such as curve fitting and magnetic...
Phase inductance is a key parameter in switched reluctance motor (SRM) design because torque and the dynamics of phase voltages and currents are directly related to inductance. Therefore, accurate calculation of the inductance at arbitrary rotor positions is important in determining the SRM behavior. Contrary to the popular but time-consuming approach to determine the flux linkage and inductance of...
Field noise interference suppression and effective extraction of signal characteristics are two keys to partial-discharge (PD) signal detection and analysis. In this paper, the autoregressive moving average (ARMA) process is utilized to model ultra-high-frequency (UHF) signals radiated by PDs. The estimation, which is based on high-order cumulants, of the ARMA orders and parameters is given theoretical...
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