Question

A 220 V, 750 rpm, 200 A separately excited motor has an armature resistance of 0.05 Ω. The armature is fed from a three-phase non-circulating current dual converter consisting of fully-controlled rectifiers A and B. Rectifier A provides motoring operation in the forward direction, and rectifier B provides operation in the reverse direction. The line voltage of the AC source is 400 V. Calculate the firing angles of rectifiers for the following, assuming continuous conduction: 1. Motoring operation at rated torque and 600 rpm. 2. Regenerative braking operation at rated torque and 600 rpm. 3. Motoring operation at rated torque and -600 rpm. 4. Regenerative braking operation at rated torque and -600 rpm.

          A 220 V, 750 rpm, 200 A separately excited motor has an armature resistance of 0.05 Ω. The armature is fed from a three-phase non-circulating current dual converter consisting of fully-controlled rectifiers A and B. Rectifier A provides motoring operation in the forward direction, and rectifier B provides operation in the reverse direction. The line voltage of the AC source is 400 V. Calculate the firing angles of rectifiers for the following, assuming continuous conduction:

1. Motoring operation at rated torque and 600 rpm.
2. Regenerative braking operation at rated torque and 600 rpm.
3. Motoring operation at rated torque and -600 rpm.
4. Regenerative braking operation at rated torque and -600 rpm.

a 220 v 750 rpm 200 a separately excited motor has an armature resistance of 005 armature is fed from a three phase non circulating current dual converter consisting of fully controlled rect 98184

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