C3.4B Engines for Caterpillar Built Machines Caterpillar


Electrical System

Usage:

CD-44B 398
电气系统是一个负极接地系统。

充电电路在发动机运转过程中工作。 充电电路中的交流发电机产生电气系统使用的直流电。

起动马达

起动马达通过发动机飞轮上的齿轮转动发动机。 起动马达速度必须足够高,以便启动一个持续的气缸内燃油点火操作。

达到所需发动机转速后,点火开关停用。 电路断开。 电枢停止旋转。 位于轴和电磁阀上的回位弹簧将从飞轮齿圈上脱开小齿轮,使其回到静止位置。

如果发动机转速增加大于起动马达的小齿轮,起动马达的电枢和机械变速箱可能损坏。 损坏可能出现在发动机起动时或发动机起动后。 超越离合器可防止起动马达电枢和机械变速箱损坏。

交流发电机

交流发电机的电气输出具有以下特性:

  • 三相电

  • 全波电

  • 整流电

交流发电机是一个机电式部件。 交流发电机经曲轴皮带轮由皮带驱动。 发动机运转过程中交流发电机对蓄电池充电。

交流发电机通过安装在皮带轮后面的外部风扇冷却。 风扇可以内部安装。 风扇将空气吹过交流发电机前部的孔。 空气从交流发电机后部的孔离开。

交流发电机把机械能和磁场转化为交流电和电压。 在三相定子内旋转直流电磁场即可实现这种转化。 电磁场由流过转子的电流产生。 定子产生交流电和电压。

交流电由三相全波整流器转化为直流电。 直流电流向交流发电机的输出端子。 直流电用于充电过程。

调节器安装在交流发电机的后端上。 两个电刷将电流导过两个滑环。 电流随后流到转子磁场。 电容器为整流器提供高压保护。

交流发电机与蓄电池相连,以满足充电和机器负载需求。 通过点火开关可以连接警告灯。 此导线可选。

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