笔者发现解放CA110PK2L2和CA1046等型汽车的暖风电机调速电阻容易烧坏。分析其原因主要是与调速开关接线的顺序有关,它的接线顺序是停—低—中1—中2—高速(共有5个挡位),如图所示。这样的接线顺序存在以下几点弊端: 1.由于无论使用哪个挡位,都得先从低挡开始,因此,每使用一次暖风机,调速电阻就得串入回路一次; I found that liberation CA110PK2L2 and CA1046 other types of car heater motor speed resistance easy to burn out. Analysis of the main reasons for the speed switch wiring connection order, its wiring order is stop - low - in 1 - 2 - high speed (a total of five gear), as shown. This wiring sequence has the following disadvantages: 1. Because no matter which gear to use, have to start with a low gear, so every time using a heater, speed resistance have to string into the loop once;