The rotating rectifier in the brushless synchronous starter/generator is more vulnerable than others. Therefore, fault detection of necessary. This article focuses on identification diode failures starter/generator. Traditional approaches based analysis from main exciter field current or machine output voltage may lose location information. To solve this problem, features rotor are analyzed. With a simple restructuring approach, magnitude ratio second harmonic to fundamental obtained by...

In this paper, a rotating rectifier fault detection method is proposed and tested, by using the differences between total harmonic distortion (THD) polarity of asynchronous exciter armature current, when works in various conditions. To describe these differences, conception THD, residual sum are used, corresponding functions defined. With functions, can be confirmed. Considering influence interference error measurement, pre-set value employed compared with values residual, functions. Then,...

Accurate and timely fault diagnosis of the rotating rectifier in wound-rotor synchronous starter-generator (WRSSG) plays an important role improving reliability WRSSG system. By analyzing geometric features rotor current trajectory main exciter (ME) under health different conditions rectifier, this article, a method for based on ME is proposed. In method, currents are estimated first, then center distance, angle, length-width ratio calculated used to detect occurrence, locate faulty diode,...

Based on the differences between waveforms of asynchronous exciter three-phase armature currents with rotating rectifier under various working conditions (healthy and open-circuit conditions), a fault diagnosis method is proposed in this article. To describe these differences, conceptions ratio, residual, sum are defined, corresponding calculation functions created. Through analysis current five categories conditions, ratios residuals calculated by observing which type can be confirmed. Then...

This study focuses on the rotating rectifier fault detection method of wound-rotor synchronous starter-generator (WSSG) with three-phase exciter. Due to difference in topography between traditional DC filed excitation system and exciter, existing for is not effective WSSG. To solve this problem, points out that ratio second fourth harmonic's amplitude fundamental can be used as signature after having analysed harmonic components exciter rotor current which estimated by stator flux under...

Based on the differences among polarity and symmetry of asynchronous exciter's armature current in various cases (healthy faulty conditions), a novel, low-cost online rotating rectifier fault detection method is proposed tested. To describe these differences, conception ratio, residual sum are used corresponding functions established. Considering existence interference error measurement, some thresholds set to compare with values residual, ratio identify differences. Under healthy condition,...

This study focuses on the identification of phase-to-phase short-circuit fault and phase open-circuit in exciter rotor windings brushless synchronous starter/generator. Traditional methods are based analysis that faulty currents have effects stator winding or voltages, but these approaches will lose location information. To locate phase, restructured current by voltage, position employed. Then root mean square (RMS) value third harmonic is used for detection location. The experimental...

In this paper, a rotating rectifier fault detection method is proposed and tested, by using the differences between total harmonic distortion (THD) polarity of asynchronous exciter armature current, when works in various conditions. To describe these differences, conception THD, residual sum are used, corresponding functions defined. With functions, can be confirmed. Considering influence interference error measurement, pre-set value employed compared with values residual, THD functions....

In the starting mode, exciter hardly provides enough field current for Main Generator to start aircraft engine, owing low speed. this paper PM wedges are used in Wound-Rotor Synchronous Starter/Generator improve excitation field. By magnetized at tangential direction, installed adjacent salient wound-rotor poles, these PM-wedges combine parallel flux path with rotor fielding windings. It can increase electromagnetic torque starter mode and out-put voltage generator mode. What's more, method...