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Classical Dependability Analysis techniques, such as Failure Mode and Effects Analysis (FMEA) and Fault Tree Analysis, have been used during the last decades to demonstrate the reliability, availability, maintainability and safety of industrial equipment. One of the main challenges that these techniques have to overcome is the complexity of current systems, in which more than one engineering domain...
This article presents the design and the implementation of a fault detection and isolation strategy for sensors in variable speed drives. Electric drives use several current and voltage sensors for control and protection. The principal objective of the strategy is to detect faults in DC-Link sensors, since the conclusion of a preliminary study showed that in some applications many functionalities...
This paper proposes an automatic detection test of gain faults in current sensors. An offline test is applied when the machine is not operating. The designed test operates at standstill without being necessary to disconnect the machine from the application. Current sensors are part of a commercial induction motor drive composed by a bilevel inverter, an induction motor and an electronic control unit...
This paper proposes and validates a modified direct-self-control (M-DSC) as a new control strategy option for permanent-magnet synchronous machine (PMSM) in railway traction applications. Taking into account all the specific requirements of the application and in order to stand-out its traction application capacity, a detailed analysis of the torque optimization technique (MTPA) and machine start-up...
In this work, a general simplified thermal model for totally enclosed variable speed radial machines is proposed. The parameters of the thermal model are calculated with simple equations based on the geometrical dimensions and material of the electrical machine. In this paper, the design procedure is described in detail and the obtained results are compared with test bench and full order model results...
This work presents a sensorless torque control of permanent magnet synchronous machines (PMSM) in railway traction applications based on the flux estimation. In order to improve the algorithm performance in a wide speed range, some compensation loops are included. Special techniques for standstill and flying start are also proposed. The sensorless control strategy is validated in a railway simulation...
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