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In this article we'll tackle the control of multi-motors electric drives with high dynamic, with rapid changes in torque and speed, with flexible coupling of motors, where the control strategy is FOC (Field Oriented Control) for each drives and the distributed control in local network using the CanOpen protocol. In the surface mining industry, from which the electric drive application for this article...
This paper presents a diagnostic system which implements several most widely used methods, using fuzzy logic, for fault diagnosis in power transformers using the dissolved gas analysis and furan derivatives analysis. A case study carried out for a power transformer is presented for the validation of the diagnosis system. The results obtained led to the rehabilitation of the transformer and putting...
Use of air core or open magnetic core resonant transformers is a modern technique for generating some high reactive powers necessary to test the insulation of power capacitors, cables and high power electric machines. In this paper it is shown the design of a non - conventional open core transformer with internal parallel resonance able to operate within the narrow frequency range agreed by test standards...
In this article we'll tackle the control of multi-motors electric drives with high dynamic, with rapid changes in torque and speed, with rigid coupling of motors, where the control strategy is FOC (Field Oriented Control) for each drives and the distributed control in local network using the CanOpen protocol. In the surface mining industry, from which the electric drive application for this article...
This paper presents the virtual instrument used to monitor and analyze the behavior of Uninterruptible Power Supplies (UPS) system. The monitoring system includes: Hall effect sensors, data acquisition board, the LabVIEW environment and PC host. The applications enable the equipment to perform the functions of digital scope and analyze the following parameters: harmonic content, total harmonic distortion...
The paper presents a new method and a new equipment for the dimensional stabilization of metal parts using controlled mechanical vibration technique. The dimensional stabilization through vibrations consists in using controlled vibrations to reduce the residual stress in metal parts or structures. The mechanical characteristics of metal parts have two basic components: the functional mechanical strength...
In this article we'll tackle the control of electric drive with high dynamic, with rapid changes in torque and speed, where the control strategy is FOC (Filed Oriented Control). Such cases were dealt with where speed is measured directly with an encoder, compared with the case of sensorless control, where speed is estimated using a Model References Adaptive Control Estimator. Simulations were carried...
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