Overview and design methodology of doubly salient brushless dc generators with stator‐field winding

Abstract

This study introduces a doubly salient brushless dc (DSBLDC) generator with stator-field winding, which incorporates the doubly salient electromagnetic (DSEM) machine and its associated rectifier. The configuration, operation principle, and armature reaction of different generating mode are overviewed. The sizing equation is derived for the initial dimension design of the DSEM machine. Then the non-linear varying-network magnetic circuit method for preliminary design is proposed to determine the fundamental geometric parameters, the corresponding field magnetomotive force, and winding configurations iteratively, in which the magnetic saturation is taken into account. Furthermore, optimal design of the geometric parameters is comprehensively investigated by finite-element analysis, and the optimised coefficients obtained for different generating mode. The operating characteristics of the DSBLDC generator with compensation capacitors are investigated to improve the voltage regulation performance. A prototype of 12 kW DSEM machine has been designed and optimised by the proposed design methods. Experiments are performed and the results verify the predictions and the design methods. Due to the simple and robust structure without permanent magnet, as well as convenient and flexible control, the promising DSEM machine is a desirable candidate for dc power generation.

Open-Circuit Fault-Tolerant Characteristics of a New Four-Phase Doubly Salient Electro-Magnetic Generator

“…From (1), it can be seen that the current of the other phase has little effect on the flux of one certain phase. The four phases are isolated from each other.…”

“…However, because of the poor working conditions, high failure rate and short life, the generator should increase the reliability and availability continuously. For these important transportation applications, generators should have the ability to continue performing their intended functions even under phase fault [1,2]. Multiphase machines with more than three phases can be applied because they can continue to run even with one or two open-circuited phases [3].…”

Topology Comparison Study of Five-Phase Wound-Field Doubly Salient Fault Tolerant Generators

“…As the core component of the electric power system, the reliability of the generator directly affects the performance of the power system. Aircrafts, automobiles, and other transportation vehicles have higher and higher reliability requirements for the electric power systems [4][5][6][7]. In these applications where reliability is critical, the generator is required to have fault tolerance for normal or low grade performance in the event of a fault [8][9][10].…”

Position sensorless control for doubly salient electro‐magnetic motor based on the terminal voltage

“…Doubly salient electro-magnetic motor (DSEM) is a new type of reluctance motor which appeared in the 1990s [1]. Due to the advantages of simple and reliable structure, high power density and flexible control, it has been applied in aeronautical start/generation system and wind generation system [2][3][4][5][6][7]. During the starting process of DSEM, it is necessary to install position sensors to obtain the accurate position information of the rotor.…”