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Mine electric locomotive is an important conveyance of coal mine, with the promotion of national energy efficient policy, and the urgent needs of manufacturers to improve production efficiency and safety, mine electric locomotive has to be developed with high-performance, low energy consumption, and humane designed. Replace the DC motors with AC motors, weeding out the speed regulation method of connecting resistance and using converter to regulate speed ,will be the inevitable development trend of mine electric locomotive.Paper described the application of mine electric locomotive speed-regulation technology and the existing problem present,what’s more,propounded a kind of variable-frequency adjustable-speed method which is fit for electric locomotive—Direct Torque Control (DTC). Mathematical model used by controlling frequency is given, then theoretically analysed the basic principles of direct torque control, hexagonal and circular flux trajectory control method, and the algorithm of non-speed sensor technology. Then, the direct torque control system was simulated and investigated, the simulation process and results was given, which verifies the correctness of the algorithm.Finally, for the special type of explosion-proof battery locomotive ,this paper introduced the non-speed sensor frequency control system realization process. The system includes hardware circuit design, the choice of the main components, two operating room interlock design, and implementation of system protection measures. After completing the hardware, the actual field experiments was carried out, and the conclusion based on the results was propounded as well.Experiment results show that the system has a series of characteristics,such as smooth speed-regulation、fast dynamic torque response、large starting torque and so on,which meet the requirements of actual production.
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