A single-phase half-controlled bridge converter supplies an inductive load with ripple-free load current. The triggering angle of the converter is \( 60^\circ \). The ratio of the rms value of the fundamental component of the input current to the rms value of the total input current of the bridge is (rounded off to 3 decimal places).

Question

A single-phase full-controlled thyristor converter bridge is used for regenerative braking of a separately excited DC motor with the following specifications:

Rated armature voltage = 210 V
Rated armature current = 10 A
Rated speed = 1200 rpm
Armature resistance = 1 Ω
Input to the converter bridge = 240 V at 50 Hz

Assume that the motor is running at 600 rpm and the armature terminals are suitably reversed for regenerative braking.

If the armature current of the motor is to be maintained at the rated value, the triggering angle of the converter bridge (in degrees) should be ____________ (rounded off to two decimal places).

Motor and converter parameters:

Parameter	Value
Rated armature voltage	210 V
Rated armature current	10 A
Rated speed	1200 rpm
Armature resistance	1 Ω
Input to converter bridge	240 V at 50 Hz

The armature of the DC motor is fed from the full-controlled bridge, and the field current is maintained constant.

\(\omega\) (rad/s)	Magnitude (dB)	Phase (degrees)
0.5	-7	-40
1.0	-10	-80
2.0	-18	-130
10.0	-40	-200

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Correct Answer: 0.94 - 0.97

Solution and Explanation

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