Consider the equations of motion of an armature controlled DC motor given by
Jw (t) + bw (t) - Ki (t) = -Tfriction - Tload (t)
L (di (t)/dt) + Ri (t) + Kw (1) = Vin (t),
where vin(t) is the input voltage and Tload(t) is the input load torque. The outputs are the armature current i(t) and the motor speed w(t)
The steady-state response of motors are specified by nominal voltage, stall torque, stall current, no load speed, and no load current.
At steady-state operation, the motor equations satisfy
Bwₛₛ – Kiₛₛ = -T_fᵣᵢ_c – Tₗₒₐ_d
Riₛₛ + KWₛₛ = Vᵢₙ
The stall torque is the load torque required stead-state speed of the motor is zero.
The stall current is the armature current when the motor speed is zero.
The no load speed is the speed of motor when the load torque is zero.
The no load current is the current when the load torque is zero.
What is stall current for this motor in A? Keep 3 significant figures, and do not include units. Use scientific notation.
The constants are given below:
Nominal voltage, vᵢₙ(t) = 13 V
Moment of inertia of the rotor, J = 0.01 kg-m²
Motor viscous friction constant, b = 0.015 N-m-s
Friction torque, Tfric = 0.005 N-m
Armature inductance, L = 0.7 H
Armature resistance, R = 0.18 Ω
Back emf constant and motor torque constant, K = 0.1 N-m/A.