Among the methods for detecting stator inter-turn faults, techniques that use harmonic characteristics have been researched in induction motors with distributed windings. However, it is questionable are available to apply permanent magnet machines concentrated windings and different control methods. First of all, this study analyzes components line current a brushless dc (BLDC) motor, including issues such as supply imbalance inherent structural asymmetry, through developed finite-element...

Interturn faults (ITFs) cause significant changes in the electrical and magnetic characteristics of motors. In particular, ITFs can be serious distortions field an air gap. Therefore, we develop a system matrix with ITF for FEM simulation, which considers nonlinearity ITF. Using analysis detection coil from results, circuit that employs proposed diagnosis algorithm is shown to detect phase location fault.

Common-mode voltage by switching pattern of space vector pulsewidth modulation excites parasitic capacitance coupling in interior permanent magnet synchronous motors, and it finally causes a shaft-to-frame voltage. Among all capacitances, winding-to-rotor has the greatest effect on voltage, which means must be suppressed for noticeable mitigation This paper proposes two suppression methods changing stator end capacitances. First, modified winding shape is utilized capacitance. Second, copper...

Condition monitoring of the stator and rotor problems such as interturn short fault (ITSF) partial irreversible demagnetization (PIDF) in an interior permanent magnet synchronous motor (IPMSM) is essential for achieving high efficiency reliability. This article presents a torque angle-based inverter-embedded technique online detection identification ITSF PIDF. monitors deviation angle caused due to PIDF at certain operating point. In steady-state operation, decreases from its original value...

This paper proposes an early diagnosis technique for the inter-turn fault (ITF) in stator winding a brushless DC (BLDC) motor using input impedance. We have analyzed varying characteristics owing to ITF through various experiments and simulation. As result, we presented simple method detection. can be applied without requiring fast Fourier transform (FFT) calculation of negative-sequence The detection system works on basis comparison measured impedance with database variations as well...

Brushless direct-current (BLDC) motors are widely used in industrial applications. These should be considered for high stability and reliability under faults which can seriously threaten safe operation. Among these fault types, a stator winding inter-turn (ITF) is one of the most common that occur BLDC motors. Moreover, propagation could quickly lead to shutdown motor within few seconds. In order prevent problem, we proposed diagnosis technique ITF using variations back electromotive force...

An inter-turn fault (ITF) is conventionally analyzed by a method that uses negative-sequence components obtained symmetrical coordinate transformations. However, this inefficient because it involves solving complex equations include many parameters. This paper proposes simplified d-q equivalent circuit model of permanent magnet synchronous motor with an ITF. The developed reflecting representative phenomena related to the negative sequence in advance final construction, such does not require...

For the control of electric motors, conventional inverters have utilized position and current sensors, but they undesirable in terms cost maintenance effort. this reason, approaches without sensors are developed by applying back electromotive force or signal injection-based method which also has some problems related to deterioration performance low speed range cross-saturation secondary saliency, respectively. To overcome above-mentioned problems, study proposes a pseudo-sensorless driver...

Different kinds of faults in the motor can occur, which causes various and independent variations magnetic flux distribution machine consequently different changes behavior its performance. These reflect linkage, be determined by voltage. A novel fault detection identification technique for inter-turn-short irreversible demagnetization interior permanent magnet synchronous are presented this paper. The deviation caused inter-turn short angle between d-axis voltage q-axis voltage, is termed...

This study proposes a technique for detecting stator inter-turn faults in brushless dc motors using the third harmonic components of line currents. The are attributed to insulation degradation between adjacent coils phase and, they cause distortions magnetic fields, which affect To analyze under asymmetric fields faulty motor, system matrix is developed. As result, currents noticeably generated comparison other harmonics, and fault can be detected by determining whether harmonics exist....

An inter-turn fault significantly affects the electromagnetic properties in electric machines, and its propagation may quickly lead to shutdown of machines within a few seconds. To build prediction or detection techniques fault, analysis should be carried out. Generally, most faults are analyzed by method using negative-sequence components obtained from symmetrical coordinate transformation. However, is complex required many parameters. Therefore, this study proposes simplified d-q...

Advance angle control of phase current is frequently used for high efficiency machine. However, advance angel can generate irreversible demagnetization permanent magnet brushless dc motor. In this paper, characteristics therefore are analyzed in accordance with inner magnet-type

Gene fusions are key drivers in acute leukemia, impacting diagnosis and treatment decisions. We analyzed 264 leukemia patients using targeted RNA sequencing with conventional karyotyping reverse transcription polymerase chain reaction (RT-PCR). Leukemic were detected 127 (48.1%). The new guidelines introduced additional diagnostic criteria, expanding the spectrum of gene fusions. discovered three novel (RUNX1::DOPEY2, RUNX1::MACROD2, ZCCHC7::LRP1B). recurrent breakpoints for KMT2A NUP98...

A fault tolerant control is mightily important in industrial and electrical vehicles. shutdown of these motors should not happen due to its direct relationship enormous loss life property, even if inter-turn a winding occur. This paper proposed an (ITF) system using new-design brushless DC (BLDC) motor, which has teeth yoke connected parallel for control. The special point BLDC motor that back electromotive force have nearly similar value phase. In addition, we used detection input impedance...

This paper proposes a diagnosis technique algorithm for brushless dc motors under stator inter-turn fault (ITF) condition using input impedance. The has early detection and various speed-range advantages. To accurately detect the ITF, rotating speed, current, voltage, resistance, inductance must be analyzed. Therefore, we choose impedance as factor because it includes all these factors. In this paper, fault-detection system works without requiring fast Fourier transform calculation of...

Large-capacity DC/DC converter with high-input voltage and low-output generally has a serial-input parallel-output structure several stages for efficiency miniaturization. However, error values in active passive elements the power supply unit of multi-stage causes imbalance each terminal. This degrades reliability because both increase stress on excessive heat. Therefore, this study proposes method to solve problem by using multiple input transformers that share magnetic coupling improve...

To analyze the influence of an inter-turn fault on electric machines, each sequence component is required through symmetrical coordinate transformation. Generally, significantly affects negative-sequence components. However, method using sequences complicate and requires many parameters. Therefore, this study proposes a simplified d-q equivalent circuit model permanent-magnet synchronous motor with by already reflecting components in current equations obtained finite-element analysis....

For precise operation of various applications such as vehicles, factory automation, robotics and aerospace, the need motors are widely used. In particular, Brushless direct-current (BLDC) currently preferred because advantages which is miniaturization, high torque density efficiency in comparison to dc induction [1]. These should be considered for stability reliability on faults can seriously threaten safety operation.

The objective of this report is to address unusual image finding multiple intravaginal calcifications caused by retained menstrual bleeding due vaginal obstruction. A 23-year-old girl was referred our hospital with abnormal uterine and dysmenorrhea since menarche. patient had a history laceration undergone primary repair at the age 8. Blind pouch without normal cervix seen in speculum examination. Old bloody, pus-like discharge leaked out from two microperforations. Ultrasonography (USG)...