How to avoid negative kick in armature current?-soft starting of buck converter fed dc motors

Dear Sir, I thank Fanqiun Jiang and MATLAB Central for solving my problem. Now I have encountered one more issue when I am simulating soft starter for buck converter fed PMDC motor.I got negative armature current during the initial period of simulation run.Kindly solve this issue.I am working towards my Ph.D
Thanks for the support.

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