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International audience; The most electrical energy in the world is produced by synchronous generators. Therefore, it has always been important to condition monitor the power generators. One of key parts of the brushless synchronous generator is rectifier that is installed on the shaft of the generator which rotates in operational mode. As a result, it is difficult to access the rectifier for condition monitoring. In this paper, a method is proposed to detect the occurred faults on the rectifier using three-phase terminal voltage of the brushless synchronous generator. In order to evaluate the method, the open-circuit fault on one diode and the open-circuit fault on two diodes which leads to opening one phase of the armature winding in exciter generator are detected in an experimental set. In the method, the relative wavelet energy along with some statistical features of the measured signals are extracted. Besides, K Nearest Neighbors (KNN) is used for fault classification.

International audience; In this paper, a permanent magnet-assisted synchronous reluctance motor (PM-assisted SynRM) is designed to be compared with a synchronous reluctance motor (SynRM) used in a blower of an air conditioner in terms of motor performance and material costs. The same stator structure and winding configuration of both motors are utilized. The motor performances are determined by using a design software tool coupled with a finite-element (FE) method. The material cost analysis is based on the material costs obtained from the supplier. The motor performances of the designed PM-assisted SynRM are better than those of the SynRM in terms of efficiency and power factor with a slight increase of the material cost. The insertion of permanent magnets in the innermost flux-barrier layer achieves the highest torque per cost. Also, the inserted permanent magnets in this position could reduce the risk of demagnetization.