TY JOUR TI STEPPING MOTOR OPERATION KW stepping motor KW dynamic modeling KW mathematical model KW PID-regulator KW transfer func-tion JO Bulletin of KSAU AU Yemelyanov, R.T. AU Prokopyev, A.P. AU Skurikhin, L.V. AU Safarov, N.A. PY 2016 IS PB Krasnoyarsk State Agrarian University