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1 课题的提出 东风4型机车为扩大恒功率运行速度范围 ,在原设计中设置了以轮对带动测速发电机为信号 ,自动控制实现牵引电动机的两级磁场削弱 ,由两个磁场削弱接触器控制磁场削弱电阻 ,与牵引电动机励磁绕组并联。两个磁场削弱接触器的接通与断开由过渡控制器来控制 ,机车
1 Question Proposed Dongfeng 4 locomotive in order to expand the range of constant power operating speed, set in the original design of the wheel-driven tachogenerator signal, automatic control to achieve two-stage traction motor weakening of the magnetic field by two magnetic field weakening contactor control Magnetic field weakening resistor, in parallel with the traction motor field winding. Two magnetic field weakening contactor on and off by the transitional controller to control the locomotive