Analysis of Speed ​​Adjustment System for Electric Locomotive

Reconstruction of electric locomotive speed regulation system and analysis of its operation The mining locomotive is an important transportation tool for the coal mine industry. Due to the harsh working environment in coal mines, the electrical drive systems of electric locomotives have high requirements.

However, the current underground mining locomotive is driven by a DC motor with a complicated structure, expensive construction, high failure rate and high maintenance costs. The speed regulation system still uses the original backward resistance step-down speed regulation method. This multi-level contact variable resistance The governor is often burnt due to strong sparks from the contacts, so the maintenance is large.

At the same time, the electric locomotive running with resistance causes a great waste of power. For high gas mines, explosion-proof battery electric locomotives are commonly used as tools for transporting materials and vermiculite. For many years, battery electric locomotive has been using DC motor string resistance speed regulation, so that 20 to 25% of the electrical energy is consumed on the resistance, resulting in waste of electrical energy. Especially the electric locomotive, because the electric power consumption is too fast, the battery charging interval is shortened, and the battery life is reduced.

In recent years, with the development of science and technology, the speed regulation of electric locomotive AC motors has been satisfactorily resolved. The AC motor speed control system not only has the same performance as the DC motor, but also has lower costs and maintenance costs than the DC motor system and higher reliability.

It is imperative to use AC motors instead of DC motors for speed regulation, and AC motors have advantages that DC motors cannot match. Because the DC speed control runs with a resistor, the power consumption is large, and the AC frequency conversion speed control does not require a high energy-consuming resistor, and the power saving rate can reach 35%. If the electric locomotive is set to regenerative feedback braking, the electric energy generated by the electric motor can be fed back to the battery when the electric locomotive is decelerating or downhill, which can greatly save electric energy and extend the charging time.