Research And Practice On Integrated Starter Alternator Damper System For Vehicles Based On Switched Reluctance Motor

Compared with other motors, Switched Reluctance Motor stands out with such features as simpler and firmer structure, lower cost, better error tolerance, normal function in higher temperature and bigger torque in low speed, etc. Thus, it has presently found wider application in many fields including Starter/Generator (S/G) system of aviation and automobile. In this project, SRM was adopted as the starter and generator for an automobile starting/generating system, and it's performance was researched respectively. The principle and systematic design was presented with SRM as the automobile ISAD (Integrated Started Alternator Damper). The main research focuses are as follows: motor theory presentation and experiments research into three-phase 6/4 SR mote; scheme design for ISAD system through an analysis of 24/16 SRM; analytical study on it's characteristics based on the SRM with a new six-phase 12/10 structure. A series of researches were carried out with a successful combination of the basic theory, the Finite Element Analysis (FEA) and experiments.Firstly, this paper discussed the basic structure topology and performance theory including driving and generating operation and control modes of SRM. Then an experiment on the generating operation had been conducted on a prototype of three-phase 6/4 SRM. Finally, an optimizing control method of lead angle of trigger and trigger pulse width had been developed.In the system design scheme of ISAD, firstly, the matching function of ISAD was researchd according to the parameters of combustion engine such as power, torque and resistant moment. Thus, the basis and the general scheme for this design were developed. And, the calculation of starting resistant moment in the motor design and generating power were figured out to specify the design target which could be the foundation for the choice of electromagnetic parameters, control circuit and implementation plan for the switched reluctance motor. Finally, a simulation was conducted regarding the starting/ boosting generating operation of the motor to prove the feasibility of the general design scheme of ISAD based on 24/16 switched reluctance motor.This project proposed a new type six-phase 12/10 SRM, which was carefully designed, simulated and tested. The chief parameter calculation relation of SRM were given followed by the determination of the 2.5KW motor parameter according to the RMxprt, a motor optimized design mode of ANSOFT, and a prototype was thus developed. After carrying out comparative study in testing, the system design was further proved to be well-established and reasonable concerning the motor design, the analysis of the torque-angle feature, motoring/starting feature and the simulation analysis of the generating feature.In the optimized design of 6-phase 12/10 SRM based on ANSOFT, fistly, we introduced the development of SRM topology structure, analyzed the effect of the phase number on such performance as starting, torque fluctuation and fault tolerance . Secondly, according to the requirements of diesel/ petrol engine ISAD system, the effect of key SRM parameters on the essential performance based on the software RMxprt and MAXWELL 2D V11. Finally, we proved the superiority of the application of the six-phase 12/10 switched reluctance motor to automobile ISAD system.