Question

Calculate the value of angular acceleration of motor using the given data: J = 20 kg-m^2, load torque = 20 N-m, motor torque = 60 N-m.

(a) 5 rad/s^2

(b) 2 rad/s^2

(c) 3 rad/s^2

(d) 4 rad/s^2

This question was addressed to me during a job interview.

The above asked question is from Dynamics topic in portion Dynamics of Electrical Drives of Electric Drives

Answer 1

The correct choice is (b) 2 rad/s^2

The explanation: Using the dynamic equation of motor J*(angular acceleration) = Motor torque – Load torque: 20*(angular acceleration) = 60-20=40, angular acceleration=2 rad/s^2.