The Research On The Application Of Frequency Conversion Speed Control For Battery Locomotive In Coal Mine

The battery locomotive used in coal mine is a primary kind of conveyances. At present it always uses the DC motor as its driver. However, with the development of the AC speed control technology, the performance of AC speed regulated system has been improved a lot. Moreover, AC motor has quite a lot of advantages over DC motor. These characters include its higher power and efficiency, brush and commutator free, the lower cost of maintenance. So this is a trend that AC motor will take the place of the prievious DC motor to be used on battery locomotive used in coal mine.Aimed at the disadvantage with using DC motor on the battery locomotive, the thesis put forward a new scheme of speed control. In this scheme, the DC motor was replaced by AC asynchronous motor. Moreover, in order to improve the performance of the speed control system in the battery locomotive, the vector control with higher dynamic performance was used in this speed control system.In this thesis, the mathernatic model of the AC asynchronous motor was discussed first. Then the principle and the realization of vector control was given. And the control algorithm that was used in this control system was analysed. The model of vector control system that is used on battery locomotive was set up. Then the thesis validated the feasibility of the control algorithm via the analysis of the simulation. The result of simulation indicated that the frequence conversion speed control system of vector control had a higher performance. Then the author designed some parts of hardware circuit and software program, and developed the vector control system which was used on battery locomotive using the singlechip 80C196MC and Intelligent Power Module (IPM). In this strategy, IPM was used to generate 3-phase power for the AC motor; the WFG unit of 80C196MC was used to generate the control signal of SPWM, A/D convertor unit to complete the sampling of current, and Event Processor Array (EPA) to complete the detection of speed. This strategy fully used the interior peripherals of 80C196MC and the interior protector and driver circuit of IPM to greatly simplify the design of the system. At last the author also validated the performance of the designed system via experiment in lab.