This paper presents a novel fault tolerant control system for Hall Effect position sensors failure of permanent magnet brushless DC (BLDC) motor in a closed loop control scheme. The proposed system is capable to detect and identify the Hall Effect sensors breakdown based on sensors signals and Discrete Fourier Transform (DFT) analysis of the measured line voltages of motor. In this paper behavior of BLDC motor is studied for Hall Effect sensors breakdown through simulation model. BLDC motor simulation model were validated first by experimental data under no fault condition. Analyzing the simulation results of the various sensor breakdowns leads to develop an expert system for Hall Effect sensors failure diagnosis in BLDC motor. A simple method is presented to generate the commutation signal of faulty Hall Effect sensor to maintain the proper operation of BLDC motor after fault occurrence. The proposed fault tolerant control system does not need massive computational efforts and can be implemented as a subroutine in the main control program of the BLDC motor. The simulation results show correct performance of the proposed fault tolerant control system.

Permanent magnet Brushless DC (BLDC) motors have been attracted by electric vehicle (EV) manufacturers in the last decade. The paper presents a simple fault diagnosis technique to detect switch faults of three phases Voltage Source Inverter (VSI) drive of BLDC motor in a closed-loop control scheme. The proposed fault diagnosis system is capable to detect the fault occurrence, identify fault type and the faulty switch of inverter based on Discrete Fourier Transform (DFT) analysis of the measured line voltages of BLDC motor. BLDC motor drive and the proposed fault diagnosis system are simulated. Simulation results were validated first by experimental data for BLDC motor operation under healthy condition. A knowledge based table is developed to identify switch faults of VSI by analyzing the simulation results under various fault conditions. The proposed fault diagnosis algorithm does not need massive computational effort and can be implemented as a subroutine with a closed-loop control algorithm of the BLDC motor on a single chip microcontroller. The obtained results show correct detection and identification of inverter switch faults in BLDC motor.

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Abstract-The colloquial term 'cold-ironing' refers to the shore power connection when a ship is at berth. Even though, cold-ironing is not new to the shipping industry only recently it received more attention, mainly due to strict emission regulations. When a ship receives shore power, its emissions can be eliminated and thus cold-ironing is becoming a popular service sought by ships that berth at emission controlled ports. Generally, the shore power connection is available only at berth and thus emissions from the ships that are anchored in and around the port is still a significant issue. This paper proposes a floating power platform for 'Mobile Cold-ironing' of anchored ships. In the proposed system, a fuel cell -battery hybrid system is used as the source. Efficacy of the proposed system in supplying dynamic loads is verified with simulation results.

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