Motor Actuator Used In Breaking Test Of Coal Mine Isolating Switch

At present, domestic isolating switch breaking test using artificial driving mechanism or pneumatic drive mechanism, manual drive is influenced by human experience, poor stability and high risk problem, pneumatic drive structure is too complex, low energy utilization, and poor control.Aim at defects of existing driving mode, put forward a kind of motor actuator to drive isolating switch break, and launch a thorough research on motor.By studying the structure characteristics of the isolator and breaking test process, analyse response characteristics and starting torque of different types motor, determine the brushless dc motor as drive motor of coal mine isolation switch breaking test.Study the working principle of the brushless dc motor, complete the motor structure design and technical parameters were determined, motor electromagnetic model is established, analyse the finite element simulation model, and prove controllability of the motor.Build mode and simulat brushless dc motor control system, design a self-tuning fuzzy PI module, reference current module, current hysteresis comparison module and a dc power inverter module, etc., and simulate the model through MATLAB simulink simulation integration environment. Results show that self-tuning fuzzy PI control strategy is suitable for brushless dc motor control system, and compared with the conventional PI control strategy,it has a strong response, good robustness, etc.Design the motor control system of coal mine isolating switch breaking test. Analyse dynamic characteristics of motor actuator, design the overall structural of control system by using DSP powerful control function,design the overall structural and each part based on modular thought, mainly including bridge inverter circuit, IGBT drive circuit and signal collection circuit, etc., and compile the corresponding software program.Finally, build test platform combined with existing laboratory equipment, according to requirements of isolating switch breaking test in MT111—2011 "mining explosion-proof low voltage alternating vacuum electromagnetic starter", carry out isolating switch breaking test of 80A and 200A explosion-proof low voltage alternating vacuum electromagnetic starter,build test platform, carry out online test, Proved the reliability of brushless DC motor actuator used in breaking test of coal isolating switch, have vital significance for solating switch breaking test detecting technology development.