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An inter-turn fault significantly affects the electromagnetic properties in electric machines, and its propagation may quickly lead to the shutdown of the machines within a few seconds. To build the prediction or detection techniques of the fault, a fault analysis should be carried out. Generally, most faults are analyzed by a method using negative-sequence components obtained from symmetrical coordinate...
For the control of electric motors, conventional inverters have utilized position and current sensors, but they undesirable in terms of cost and maintenance effort. For this reason, approaches without the sensors are developed by applying back electromotive force or signal injection-based method which also has some problems related to the the deterioration of control performance in low speed range...
Common-mode voltage (CMV) by switching pattern of space vector pulse width modulation (SVPWM) excites parasitic capacitance coupling in interior permanent magnet synchronous motor (IPMSM), and it finally causes shaft voltage. Among all parasitic capacitances, winding-to-rotor parasitic capacitance has the greatest effect on the shaft-to-frame voltage. In the study, mitigation method of a shaft-to-frame...
This paper proposes optimized design of permanent magnet synchronous motor (PMSM) using hybrid type permanent magnet (PM) for improving the output characteristics and reliability. Here, the hybrid type PM is defined as using both of neodymium permanent magnet (Nd-PM) and ferrite permanent magnet (Fe-PM) in a rotor. First, the optimized design of PMSM considering magnetic equivalent circuit is suggested...
This paper presents analysis of cogging torque and torque ripple according to unevenly magnetized magnet patterns in permanent magnet synchronous motor. In previous studies it has confirmed that non-uniformly magnetized permanent magnet causes unexpected increase of cogging torque and torque ripple because of slot harmonic components. However, these studies investigated insufficient number of irregular...
An optimal field weakening (FW) control for interior permanent magnet synchronous motor (IPMSM) considering the nonlinearities of IPMSM and inverter is presented in this paper. Nonlinearities of inverter cause distortion voltage (DV) which considerably affects the efficiency of IPMSM in FW region. In FW operation, the efficient utilization of available voltage is extremely important. Typically, in...
As the common-mode voltage generated by the pulse width modulated inverter excites the parasitic capacitance coupling between the winding, stator, rotor, and bearing, shaft voltage occurs between the shaft and the grounded motor frame. Thus, this study proposes the shaft voltage suppression approach by applying a cylindrical copper shield surrounding the shaft in an interior permanent magnet synchronous...
To analyze the influence of an inter-turn fault on electric machines, each sequence component is required through symmetrical coordinate transformation. Generally, the fault significantly affects the negative-sequence components. However, the method using symmetrical sequences is complicate and requires many parameters. Therefore, this study proposes a simplified d-q equivalent circuit model of a...
This paper proposes a design technique of permanent magnet synchronous motor (PMSM) using hybrid type permanent magnet (PM) to consider simple structure and irreversible demagnetization. Here, the hybrid type PM is defined as using both of neodymium permanent magnet (Nd-PM) and ferrite permanent magnet (Fe-PM) in a rotor. For developing a competitive motor in terms of performance per manufacturing...
Advance angle control of phase current is frequently used for high efficiency of machine. However, advance angel control can generate irreversible demagnetization of permanent magnet brushless dc motor. In this paper, irreversible demagnetization characteristics therefore are analyzed in accordance with advance angle of phase current in inner permanent magnet-type brushless dc motor.
Common mode voltage of the inverter output create a leakage current in the stator. It creates a net magnetic flux link with the shaft and induces an electromotive force (EMF) in between the two ends of the rotor. This EMF generates a current through two bearings and reduces its lifetime. In this study, we propose a frequency selective low impedance path to dissipate the EMF in the shaft. Finally,...
While Switched Reluctance Motors have good performances, such as high torque/volume ratio, high speed, and high reliability, the motor has serious disadvantage on large torque ripple. In this paper, therefore, the Switched Reluctande Motor having barriers in the rotor is proposed to improve the torque performance of the motor. In order to reduce the torque ripple, the shape optimization of the barrier...
In this study, we propose the mitigation method of a shaft voltage according to change in parasitic capacitances of a permanent magnet synchronous motor (PMSM). First, we designed the equivalent circuit taking into account all parasitic capacitances. Then, we deducted that rotor-to-winding and stator-to-rotor capacitances mainly affect the shaft voltage. The stator-to-rotor capacitance depends on...
Magnetic materials are used for all kinds of electromagnetic energy-conversion devices to improve the capability of magnetic circuit. Iron Powder Materials are recently received much attention in the electric machine aplications due to their advantages over lamination steels, such as low iron losses and large fill factor. This paper describes an BLDC motor with iron powder materials and its perfomances...
As smart devices such as sensors, smartphones, and CCTVs are becoming extensively utilized recently, stream data from those smart devices are consistently generated explosively. There are also increasing cases that we notice security attacks after already important assets are damaged by cyber-targeted attacks such as APT attacks due to the lack of real-time security log processing capability. Accordingly,...
As smart devices such as sensors, smartphones, and CCTVs are becoming extensively utilized recently, stream data from those smart devices are consistently generated explosively. There are also increasing cases that we notice security attacks after already important assets are damaged by cyber-targeted attacks such as APT attacks due to the lack of real-time security log processing capability. Accordingly,...
The loss reduction algorithm for the light-load is needed to increase overall efficiency. The inductor current ripple is the fixed magnitude, and it generates almost loss of the total losses at the light-load. Therefore, the ripple current reduction algorithm is efficient method to increase the light-load efficiency. This letter proposes the control algorithm to increase light-load efficiency by controlling...
In this paper, we analyze the back electromotive force (BEMF) characteristics according to the magnetization pattern of irreversible demagnetization to determine the fault type for interior permanent-magnet (IPM) type brushless DC (BLDC) motors. We numerically model irreversible demagnetized PMs using space-harmonics analysis. In addition, we analyze the results using the finite element and analytical...
This paper compares Scalar and Vector control of three phase nonlinear interior permanent magnet synchronous motor (IPMSM) in healthy and under inter turn fault (ITF) state. Finite element method based model of IPMSM is used for simulation, which considers all nonlinearities and magnetic characteristics of the core such as saturation, cross magnetization, core loss, and skin effect. In order to study...
This study proposes a technique for detecting stator inter-turn faults in brushless dc motors using the third harmonic components of line currents. The faults are attributed to insulation degradation between adjacent coils in a phase and, they cause distortions in the magnetic fields, which affect the harmonic components in line currents. To analyze the harmonic components under the asymmetric magnetic...
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