混合动力车用混合励磁爪极皮带式起动发电机多领域仿真分析(英文)

Multi-domain Simulation Analysis of A Hybrid Excitation Claw-pole Belt-alternator Starter Generator for Hybrid Electrical Vehicles

传统爪极电机通过调节励磁电流控制气隙磁通,用以满足变负载运行时恒压向蓄电池供电,但由于漏磁大,导致输出能力小、效率低等缺点,满足不了目前混合动力汽车供电要求。该文设计了一种42 V供电系统混合动车用混合励磁爪极皮带式起动发电机(belt-starter-generator,BSG),通过在爪极间镶嵌磁钢来减小爪极间漏磁,提高电机功率密度和低速输出能力。采用磁路法和三维有限元法分析了BSG电机结构及其原理,基于机械、模态和热工多领域综合仿真分析方法解决高密度电机极限能力分析与优化设计。仿真分析得出样机在电动模式下,可以获得起动转矩起动引擎,在发电模式下,可以在宽速度变化范围内输出恒定的电压向蓄电池供电。实验数据和三维有限元计算结果与理论分析一致,样机具有漏磁低、输出能力大、输出特性硬等优点,该电机的设计在混合动力汽车中具有广泛的应用前景。

The traditional claw-pole machine control air-gap flux to transmit stable output voltage to batteries by regulation excitation current,which has disadvantages such as lower output capacity and inefficiency caused by leakage flux.It doesn＇t meet the current requirements of hybrid vehicle power supply.A hybrid excitation claw-pole belt-starter-generator（BSG） machine for 42 V power supply system hybrid electric vehicles（HEVs） has been created.Through permanent magnets inserted among claws,this kind of generator can reduce the leakage between the claw-poles,increase machine power density and output capacity under low speed.This paper will use magnetic circuit and three-dimension finite element methods to analyze the structure and principles of BSG.The multi-domain simulation methods include mechanism,vibration modal and thermotics to solve the analysis of high-density machine ultimate capacity and optimization.The simulation results have showed that with high starting torque in starter mode,the machine can constantly provide output voltage at wide speed range for batteries charging in generator mode.Experimental results of prototype confirm the theoretical analysis and simulation conclusion.The prototype has advantages such as low leakage,large output capacity and hard output characteristics,which has broad application prospect for hybrid electrical vehicles.