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The influences of current amplitudes on four-phase 24/18-pole doubly salient electro-magnetic motor(DSEM) under fault-tolerant operation are studied in this paper. Taking average output torque, output torque ripple and stator copper losses into consideration, the optimal fault-tolerant current amplitude (FTCA) range is obtained. A four-phase full-bridge converter with two bilateral switches is applied...
Excitation fault is troublesome because it takes a negative impact on the overall performance of the doubly salient electromagnetic machine (DSEM). To deal with the excitation fault, this paper studies the machine design and fault-tolerant control strategies for DSEM driving system with three-phase full-bridge converter. With the view of the unique electromagnetic structure of DSEM, this paper analyzes...
This paper proposes a novel fault tolerant inverter topology for the high reliability of the dual-stator doubly salient electro-magnet machine (DSEM), and thus maintaining the undegraded output performance after the open-circuit or short-circuit fault. The proposed topology adopts the diverter switches to reconnect the floating phase windings, and reconfigures the dual-inverter to be the five-leg...
Power converter open-circuit fault leads to reduction of motor output performance. Fault-tolerant control strategy, which is applied to power converter of four-phase doubly salient electro-magnetic motor (DSEM) drive, is investigated in this paper to improve the post-fault motor performance. A fault-tolerant topology is newly presented. It has the advantage of simple structure with only two bidirectional...
To find the design basis of a new machine, the armature reaction should be first analyzed. With the given mathematical model of the excitation magnetic potential and the armature reaction magnetic potential of the wound-field doubly salient generator, the static armature reaction is presented in this paper. With the presented voltage equation, the simulated flux, current, and voltage waveforms are...
Traditional financial trading systems were developed in database-based standalone model years ago. Given that there exist some evident drawbacks like high latency and low availability in such architecture, it is imperative to design a new model which can meet the requirements of time-sensitive financial transactions. Therefore, in this paper we design and implement a state-replication based matching...
A novel approach to Advanced Avionics fault tolerance is proposed that takes inspiration from the intersection of human immune system and nervous system as a method of fault recognition and removal. The human body's defenses-the immune system, the sense of pain, and the healing processes-could serve as a conceptual model for high-confidence systems in advance avionics fault tolerance. In this paper...
In this paper, the fault tolerant system for doubly salient electro-magnet motor(DSEM) drives have been proposed to maintain the control performance under open phase faults of inverter. The proposed fault tolerant system provides compensation for open-circuit faults in power inverter. The fault identification is quickly achieved by phase current and voltage changes between lower legs and middle point...
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