This paper proposes an input harmonic current reduction method for an electrolytic capacitor-less inverter for an IPMSM drive system. The spatial harmonics in the IPMSM cause harmonic distortions in the input current. In addition, this paper proposes a design method for a PI controller for the d-q axis current in order to improve the input current …
An online failure detection method for a DC-link electrolytic capacitor in a back-to-back Pulse width Modulation (PWM) converter using the opposition-based learning particle swarm optimization-based Support Vector Regression (OPSO-SVR) technique is proposed and the experimental results prove the superiority of the proposed technique over the SVR. Since …
The existing methods for detecting surface defects in electrolytic capacitors are typically based on conventional machine vision, with limited feature extraction capabilities, poor versatility, slow detection speed, and the inability to achieve …
Since the lifespan of an electrolytic capacitor is relatively short compared to other power semiconductor devices, the failure rate accounts for 60% and, thus, it is the most vulnerable component of the power conversion device. Therefore, the accurate measurement of the lifetime of an electrolytic capacitor is very important in ensuring the …
Polyester/MKT Capacitor Failure Detection Polyester/MKT capacitors are less prone to failure. If the visual inspection did not suggest any clue (burnt, explosion, leakage … etc.), then follow the same procedure as mentioned above for an …
The aging of electrolytic capacitors and detection of thereof 2022 Bachelor''s Thesis. 21 pages, 7 pictures. Examiner: Tommi Kärkkäinen In this thesis the aging of electrolytic capacitors was investigated, along with two methods, that can be used to detect
Due to thin film capacitor''s enhanced reliability and improved input current harmonic performance, adjustable speed drives (ASDs) without using electrolytic dc-link capacitors have been researched extensively in recent years. However, because of thin film capacitor''s smaller capacitance per volume, it can experience a more severe dc-link …
This paper proposes a comparative study of current-controlled hysteresis and pulsewidth modulation (PWM) techniques, and their influence upon power loss dissipation in a power-factor controller (PFC) output filtering capacitors. First, theoretical calculation of low-frequency and high-frequency components of the capacitor current is …
An online failure detection method for a DC-link electrolytic capacitor in a back-to-back Pulse width Modulation (PWM) converter using the opposition-based learning particle swarm optimization-based Support Vector Regression (OPSO-SVR) technique is proposed and the experimental results prove the superiority of the proposed technique over the SVR.
FAILURE DETECTION METHODS Numerous methods have been proposed for failure detection, which mainly focus on the ESR of the electrolytic capacitor [1]–[14],[17]. Numerous parameters, for example, current or temperature need to be measured, which increases intricacy and accuracy of the measurement.
Download Citation | On Jan 1, 2024, Haijian Wang and others published Electrolytic Capacitor Surface Defect Detection Based on ... However, most LiDAR-based 3D object methods work in a supervised ...
Recent Developments in Fault Detection and Power Loss Estimation of Electrolytic Capacitors. ... The EMD method was combined with the chaos synchronisation detection method to chart the discharge ...
detection. One method has used capacitor electrolytic temperature to evaluate electrolytic volume for calculation of ESR[14]. 4. LIFE PREDICTION MODEL Electrolytic capacitors have limited but indefinite life period. Life time may vary due tofactors.
C. For electrolytic capacitors whose positive and negative signs are unknown, the above method for measuring leakage resistance can be used for discrimination. That is, first measure the leakage resistance arbitrarily, remember its size, and then exchange the test leads and then measure a resistance value.
An online failure detection method for a DC-link electrolytic capacitor in a back-to-back Pulse width Modulation (PWM) converter using the opposition-based learning particle swarm optimization-based Support Vector Regression (OPSO-SVR) technique is proposed and the experimental results prove the superiority of the proposed technique over the SVR. Since …
This paper proposes a comparative study of current-controlled hysteresis and pulsewidth modulation (PWM) techniques, and their influence upon power loss dissipation in a power-factor controller (PFC) output filtering capacitors. First, theoretical calculation of low-frequency and high-frequency components of the capacitor current is …
In order to relieve the problem of a false and missed detection of casting defects in X-ray detection, a robust detection method based on vision attention …
Step I, Fig. 3(b) lists some commonly used parameter acquisition methods. It is found that industrial instruments including weighting meters [108], [109], X-ray image meters [110], optical ...
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