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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...
The modulation method in inverter-fed ac-drive applications has a great influence in the performance of the entire system as it generates losses in the converter and the machine, degrades the signal waveform quality and causes additional noise and vibrations. By carefully selecting the modulation method, some of these unwanted effects can be improved. This paper explores the influence of some of the...
This paper presents a detailed comparison between two control strategies, field oriented control (FOC) and direct-torque control (DTC), in permanent-magnet synchronous machines (PMSM) for railway traction applications. The analysis is initially carried out in simulation, and some experimental results obtained from a 100 kW test bench are also included.
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