Fault analysis of automotive claw pole alternator rectifier diodes

Murken, M.; Kubel, D.; Kurz, Andreas; Thanheiser, Andreas; Gratzfeld, Peter

doi:10.1109/esars-itec.2018.8607641

Cited by 9 publications

(2 citation statements)

References 18 publications

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“…В даний час трифазні генератори стали гальмом розвитку автомобільної електромережі та гальмом впровадження у неї нових енергоємних споживачів. Зростання потужності споживачів стримується зростанням втрат у вузлах випрямлячів, реалізованих на діодах [2], які до того є основним джерелом несправності [3]. Внаслідок цього у ряді випадків провідні виробники генераторів змушені використовувати водяне охолодження, але і при цьому не вдається реалізувати потужність генератора більше 2,2 кВт.…”

Section: аналіз публікаційunclassified

Increasing the efficiency of the automotive generator due to active rectification

Dvadnenko,

Dziubenko

2024

VEIT

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Problem. Increasing fuel economy requirements for modern vehicles lead to an increase in their electrification. The rise in the number of electrical systems leads to a higher load on the electrical power supply system, with the vehicle's power load reaching 2-3 kW. Leading automobile companies have begun serial production of vehicles with the new 12/48 V power supply voltage standard. The traditional alternator used today is a synchronous alternator, and rectifier diodes are used to convert the generated AC to DC to charge the battery, which is inefficient. A study of losses in an automobile alternator shows that the diode rectifier creates a significant portion of the machine's losses at low speeds, resulting in increased fuel consumption. The solution to this problem is to use a synchronous rectifier to replace traditional rectifier diodes, thus improving the efficiency of the AC/DC rectifier. Goal: To improve the economic and environmental characteristics of a mild hybrid vehicle through the use of a synchronous two-semi-periodic rectifier with a midpoint in the car generator. Methodology: Analytical methods are used to calculate energy losses on diodes and in the phase windings of the generator when employing a two-semiperiod rectifier with a midpoint, compared to a bridge rectifier. Results: The structure, functions, and operation modes of the synchronous rectification system are considered. The effect of synchronous rectification on the generator efficiency of a mild hybrid vehicle is analyzed. It was determined which configurations of synchronous rectification are more effective from the standpoint of energy saving and under which operating conditions. It was determined that in a two-semiperiod rectifier with a midpoint, compared to a bridge rectifier, there will be the same heating of the phase windings and 2 times fewer losses on the diodes. Practical value: A version of the bridge synchronous rectification system of the 48 V generator for a mild hybrid vehicle using MOSFET transistors and specialized control IC is proposed. A synchronous rectification system and its circuit implementation for a 12 V generator based on a two-semi-periodic rectifier scheme with a midpoint is proposed, which allows increasing the energy efficiency and economy of the automobile generator.

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Section: аналіз публікаційunclassified

Increasing the efficiency of the automotive generator due to active rectification

Dvadnenko,

Dziubenko

2024

VEIT

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“…According to empirical data, the problems [1,2,3,4,6,9,10,11,12,13,14,15,16,17,18,19,23] (see Figure 1) are the most common for automotive alternators. These faults result in excessive heating of alternator (12 %), excessive noise during operation (15 %), zero (7 %) or low output voltage (40 %), increase in output voltage (26%) [7].…”

Section: Introductionmentioning

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Diagnosing of Failures of Automotive Alternators Based on Amplitude of Fluctuations of Voltage

Puzakov¹

2019

Proceedings of the International Conference on Aviamechanical Engineering and Transport (AviaENT 2019)

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Automotive alternators problems constitute about 21 % of total automotive electrical faults. Fault in automotive alternator can cause different implications, ranging from fault in battery accumulator or electronics through road traffic accident. Fluctuation of output voltage is accepted as the main diagnostic parameter as being the most sensitive to faults in automotive alternators. Disadvantage of existing methods for determining the fluctuation of output voltage is a smoothing effect of battery accumulator and absence of methods for interpreting the obtained quantitative data. It is suggested to improve the diagnostic method using an oscilloscope through the exclusion of smoothing effect of battery accumulator. The developed diagnostic method makes it possible to assess the technical condition alternators without dismounting them from a car based on the parameters of output voltage through the comparison of the obtained value of output voltage fluctuation with the allowable value. It is found that fluctuation of output voltage of serviceable alternators increases monotonically with increasing time in service without reaching limit or allowable values. Voltage fluctuation in alternators with electrical problems significantly exceeds allowable values that makes it possible to use this parameter for the determination of technical condition. Fluctuation of output voltage used as a diagnostic parameter makes it possible to assess the residual operation time of automotive alternators. Determination of residual operation time of automotive alternators can improve the operational efficiency of cars by means of decrease in standby time during repair.

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Investigation of the Failures of the Rectifier of the Automobile Alternator According to the Output Voltage Spectrum

Puzakov

2020

2020 International Multi-Conference on Industrial Engineering and Modern Technologies (FarEastCon)

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Fault analysis of automotive claw pole alternator rectifier diodes

Cited by 9 publications

References 18 publications

Increasing the efficiency of the automotive generator due to active rectification

Increasing the efficiency of the automotive generator due to active rectification

Diagnosing of Failures of Automotive Alternators Based on Amplitude of Fluctuations of Voltage

Investigation of the Failures of the Rectifier of the Automobile Alternator According to the Output Voltage Spectrum

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