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Assignment:
A DC drive is feeding a universal motor from a 250 V 50 Hz supply. The motor armature inductance is 50 mH, the motor armature resistance is 5 Ω; the motor armature constant constants are 0,9 V/rad/s and 0,9 N.m/A and the motor rotational speed is equal to 1591,5 rpm.
1. Determine the back-emf of the motor.
2. Sketch the half-cycle equivalent circuit of the drive.
3. Determine the thyristor current at π.
4. Determine the time that the commutating diode will conduct.
5. Sketch the motor voltage and current graphs. Label with relevant limits.
6. Determine the mean motor voltage.
7. Determine the mean motor current.
8. Determine the mean torque.
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