To realize stepless speed control of the reluctance launch,a two-stage reluctance launch circuit with IGBT timing control and no reverse pull was constructed,and the velocity-time curve of armature in the coil was studied,based on the armature end-point effect and the armature resistance coefficient,the function of velocity to time is obtained by the hierarchical polynomial fitting of the velocity-time curve with the least square theory.When the target exit velocity of the armature is less than the maximum velocity of the first stage coil,the second stage coil does not work,the on-off time sequence of IGBT is obtained by fitting the first-stage speed time function to realize the armature target exit velocity,and when the armature target exit velocity is higher than the highest speed of the first-stage coil,the first stage IGBT sets the on-off time sequence according to the maximum speed,and the on-off time sequence is obtained by the second stage velocity time fitting function to realize the armature target exit speed.Finally,the experimental results are compared with the theoretical values,and it is concluded that the stepless speed regulation can be realized by selecting the correct IGBT on-off timing sequence.
万方数据
维普
