Ultra-high-speed permanent magnet synchronous motors are widely used in turbine machinery due to their high speed,high power density and small size.A 5 kW/150000 rpm ultra-high-speed permanent magnet motor which is used for vehicle electric turbo compound system was analyzed,mainly focused on rotor strength,motor loss and temperature rise.First,based on the classic motor design theory,the design steps are defined and the electromagnetic design is completed;then,a 2D simplified model of the motor rotor is establish and the rotor strength is analyzed through multi-physics coupling method;finally,based on the motor loss theory,the thermal characteristics of the motor are analyzed;the results show that the designed motor can meet the overall requirements of the electric turbo compound system,and provides information and references for motor development and optimization design.
注塑零部件主要的连接方式有螺钉连接,卡扣连接,铆钉铆接.卡扣连接比较普遍,其中注塑一体卡子卡接由于不用单独开模具,具有成本优势,且固定牢靠,在注塑零部件上应用的非常普遍.本文主要从正向设计方面介绍注塑一体卡子的设计方法,对实车装配过程中卡子失效一类的问题解决有着重要指导意义.
根据客户调研结果,实测用户道路载荷谱和试验场道路载荷谱,用nCode GlyphWorks软件进行数据处理和分析.通过对轴头加速度、轴头位移以及板簧应变的损伤计算,确定出基于轴头位移进行试验场路面与用户路面的当量关系计算.最后通过对数据的雨流计数分布以及频域损伤谱的分析,进一步验证了所计算当量关系的准确性以及适用性,为在试验场进行整车路面负荷可靠性快速验证提供了一定的理论依据.
针对开发过程中遇到的减振器低温异响问题,本文通过整车测试和台架测试识别异响发生源,定位异响发生的工况.根据减振器内部阀系的工作原理,聚焦异响发生的条件,进而从优化减振器阀系设置的角度,找到一种有效抑制减振器换向异响的措施.经过装车主观评价,该问题得到了有效的解决.
为研究侧面柱碰及侧面可变形壁障碰撞试验特点,选取某B级轿车分别进行了Euro-NCAP中侧面柱碰试验和C-NCAP侧面可变形壁障(AE-MDB)试验.分析了车身加速度以及假人伤害特点,结果表明:侧面柱碰撞相比可变形壁障碰撞对乘员有更大的损伤风险,车身加速度更大,车身侵入量更大、局部变形更严重.为减少侧面碰撞伤害,需要增加碰撞侧车身局部强度,避免小区域重叠刚性碰撞.
