Based on transient FEM（finite element method） to simulate and analysis the relationships of output power of the Multi-cell three-phase wound-field doubly salient DC generator when composing elements increases which simulation results are basically identical to the deducing conclusion.Then the variation between Maximum output power and stator/rotor poles with the same armature diameter is further studied,such that an optimal stator/rotor pole design can be reached.

The Doubly Salient Machine(DSM) is a new type variable reluctance machine. This paper briefly introduces this machine's structure features,classes and uses first,and analyses and introduces the principle,system construction,features of the Doubly-fed Asynchronous wind power system and Permanent Magnet Direct-driven wind power system, at the basis of which the Direct-driven and Indirect-driven Doubly Salient wind power systems are proposed,such that the system complexity and cost is highly reduced,and the machine is quite structural simple,rigid,fabricated more easily,and of satisfactory working reliability and maintenance.So the Doubly Salient wind power system may have a brilliant future.

The field windings and permanent magnets of compound flux-path three-phase stator hybrid excited doubly salient DC generator are on the same cross-section orthogonal to the shaft,where flux excited by field windings and permanent magnets multiplexes the core paths.This machine has small excitation power,can regulate its field in a designing range,and outputs in one channel or double channels.This paper introduces the typical topologies,analyses the operating modes with Transient FEM,and extracts the inductance based on the field analysis,then calculates nonload and external V-I characteristics comparatively,at last open-loop cross-regulation-rate of double channel outputs is also simulated.The results point out that this machine has a wide application future,which can be used as brushless DC generators in isolate generating systems and connects to the grid;it is especially suitable for high-speed generators applied in aeronautics or other field works and can realize the integrated start /power generation.

Using transient finite element method to analyze this Brushless DC generator's static parameters and operation performance in order that the performance under real load can be solved directly including nonlinear saturation of core materials,fringing magnetic field,armature reaction of lumped windings.Emphasis introduces the structure and topology features of wound-field doubly salient DC generator,then the mathematic model of this generator is built up,which lies in extraction of static parameters such as winding inductance,coupled inductance.Also,a 72/48 multi-cell three-phase wound field doubly salient DC generator is simulated to analyze the operating characteristics of different load generators,and provided a beneficial reference for the machine designer.

Modern aero-power supply systems have four different types: 28V Low-Voltage DC power supply(LVDC),270V High-Voltage DC power supply(HVDC),400Hz Constant-Frequency power supply and 360-800Hz 115/200V Variable-Frequency power supply.This paper makes a detailed introduction to the profile and development of these four types of aero-power systems;also analyzes their characteristics and compares their merits and demerits with representative aircrafts.Finally the tendency of modern aero-power supply systems is well predicted.

Starter/Generator integration is a major trend of modern aero power supply systems.The QF18D Aero Starter/Generator(ASG) adopts the three-phase Doubly Salient Machine(DSM),which boasts of the no-permanent-magnet no-winding rotor,strong construction,convenient fabrication,fine inverting operation,etc,such that it is very suitable for high speed high altitude aviation.This paper first makes a brief introduction to the structure and working principle of the QF18D ASG;then based on a mixed methodology of FEM simulation and lab test studies the QF18D Doubly Salient DC Generator(DSDCG)'s characteristics including nonload,short-circuit,external and regulation in detail,mainly focusing on the mechanism of the influence of commutation overlapping and armature reaction to the machine's key characteristics;finally,lab testing of cold running and hot start of the aerial turbine engine is implemented and superior starting performance of the QF18D system is verified.

Distributed Generation(DG) means the way to supply electric power by small-scale generators in some key parts of the public power system or near the electricity load.Proper development of DG is beneficial to economizing on energy consumption and protection environment.This paper proposes single-phase Doubly Salient Generator(DSG) as the major generator of the small-scale distributed DC power supply system due to the compact construction,high ratio between power and weight and high speed,which can simplify the system,reduce the cost and improve the reliability.First,the principle and topology of this type are introduced,then electromagnetic computation for this machine with transient Finite Element Method(FEM) is implemented.The external characteristics and output power characteristics of wound field and permanent magnet 4 poles/6 poles single phase DSGs and wound field 6 poles/4 poles three phase DSG are analyzed and compared respectively,even including the three generation methods of wound field 4 poles/6 poles single phase DSG.At last,the output-ripple-voltage reduction methodology is simulated and verified.