The Cause Of Formation Of Series Exciting Head Of Electric Locomotive

There are two reasons for the electric locomotive mechanical characteristics of the serial IP idea to form this situation:

One is that the electric locomotive maintenance is not real-time. When the main handle of the electric locomotive is in the position 1-3 (or 1-4), the electric locomotive does not move (such as: the controller contact is not closed, or the resistor is burned out, or the circuit is open, etc. ) If it is not cleared, the resistor of the locomotive is not connected to the motor current loop, causing the resistor to not function as a current limiter.

The second is that the driver of the electric locomotive did not follow the manual operation during the operation, instead of turning the main handle of the driver controller step by step, but turning the handle to the normal underground mining locomotive operating position (that is, the operating position without resistance), which is also at a certain level The starting resistance does not have the function of current limiting, resulting in excessive motor starting current. Yunyun runs with illness for a long time, and illegal operation will definitely affect its underground mining locomotive service life.

Implementation of reverse current (reverse connection) braking during the transportation process, due to the huge underground consumption conditions, poor quality of the transportation track, and the incomplete brakes, lights, and alarm bells of the underground mining locomotive, reverse current braking is often applied to the electric locomotive, namely Squeeze the brakes. Although this kind of braking effect is remarkable, it violates the operating regulations, causing mechanical and electrical shocks to the electric locomotive and its motors.

The mechanical characteristics of the series motor reverse connection control idea can be seen. Frequent implementation of reverse connection braking has an impact on the service life of the series motor, especially when the additional resistance Rf does not work.

The frequency of underground mining locomotive is still overloaded, which affects the service life of the motor. In the calculation of transportation design, it is usually calculated according to the temperature rise conditions of the traction motor of the electric locomotive, and checked according to the braking conditions and relevant economic factors and technical conditions. However, in the actual transportation process, the motor Drivers often ignore this, often overloading.

For example, some transport teams are pulling hard if they are able to pull, and they are sprinkled with sand to deadlift if they cannot be pulled. The number of tractors often exceeds the number of tractors calculated according to the adhesion conditions. In this way, the temperature rise of the traction motor is often higher than the allowable value. If the locomotive runs for a long time, the insulation of the motor will be reduced and aged due to overheating, thereby reducing the service life of the locomotive.