In recent years, power electronics technology, computer technology, and automatic control technology have made rapid development, leading to a historic revolution in power transmission technology. With the continuous improvement of the modernization degree of coal mines in China, the mining locomotive transportation system, which is one of the “bottlenecks” of underground coal mine production, must develop new types of locomotive in terms of reliability, maintainability and economy.
Speed traction system. Compared with DC motors, AC motors have obvious advantages: small size, light weight, ruggedness and easy maintenance. At the same time, the AC motor does not have a reversing spark like a DC motor during operation, so it is more suitable for use in a downhole explosion-proof environment. The AC motor car adopting the frequency conversion speed regulation technology has the advantages of low maintenance rate, high starting torque, good speed regulation performance and high economic benefit because it does not need high energy consumption step-down resistors, and has the advantages of low maintenance rate, good starting torque, high economic efficiency and the like. The replacement of DC motor vehicles by electric vehicles has become a trend. Therefore, the use of AC asynchronous motor as the traction motor of the locomotive is the best choice. Due to the harsh working environment of the locomotive, the speed control system is in a state of frequent starting, braking, acceleration and deceleration, etc. And also needs to adapt to the load up and down slope and bumpy road conditions, etc. Therefore, the motor requires a large starting torque and a strong overload capability. The starting torque and traction characteristics of the AC speed control system with vector control can be compared with the characteristics of the DC motor speed control. Therefore, this paper uses a vector control scheme. After years of development, vector control has been continuously improved in various aspects, and has entered the practical stage. At the same time, the application of high-performance DSP chip solves the problem of large calculation in vector control, so the high-dynamic performance vector control inverter has successfully applied in rolling mill main drive, electric locomotive traction system and CNC machine tools. Using high-speed motor control dedicated DSP, embedded real-time software operating system, developing a more practical rotor field orientation method and accurate flux observer, the inverter can obtain high starting torque and high overload capability, which will be the future vector control technology. Important development direction.
The mining battery locomotive was modified, the battery device was retained, the asynchronous motor and vector control technology were selected to transform, and then the corresponding principles and techniques were analyzed. Then, according to the characteristics of the mining locomotive, various technologies were selected and carrying out the required hardware and software design, can realize the stepless speed regulation of the locomotive, completely changing the backward condition of the common resistance speed regulation of the locomotive, and making the locomotive have zero speed starting and smooth starting, uniform speed regulation and no impact. Large traction and low energy consumption. Simple and convenient to operate, high reliability, excellent cost performance, good safety and excellent braking performance. The technology transforms the old locomotive, which greatly saves the research and development cost, can improve the economic benefit of the enterprise, and has broad application prospects.
