Solution Softstarter

Solution:

1.   From table: V_Start = 40%, T_Ramp = 20 s

2.   P_mech = T * n / 9550   =>  T_N = P_mech * 9550 / n_N  =  15 kW * 9550 / 1435 min^-1  = 99,83 Nm

3.   T proportional to V² => without Softstarter:  T_Start = 2,8 * T_N = 2,8 * 99,83 Nm  = 279,524 Nm

=>    With Softstarter: T_{Start Softst.} = 0,4² * T_Start = 0,16 * 279,524 Nm = 44,724 Nm  > 40 Nm

=>  breakaway is possible