A DC motor with the armature voltage E = 120 V is supplied from a single phase r

Question

A DC motor with the armature voltage E = 120 V is supplied from a single phase rectifier as shown in Fig. 1 with a sinusoidal voltage of rms value U = 120 V. The motor resistance R = 3.5 Ohm. The supply current has the waveform Calculate the crms values I_n of of the supply current harmonics and rms value ||i||. Comparethe rms value of the current calculated from the efinition with the value calculated from harmonics rms values. Calculate meter readings in the rectifier circuit active load as shown in 3 Fig.

Explanation / Answer

The rated armature current is

/ = P /Eo = 225 000/250 =900A

Each coil is made up of 2 conductors, so altogether there are 243 X 2 = 486 conductors on the armature. Conductors per slot = 486/81 = 6

The motor torque is

T = 9.55 P/n

= 9.55 X 225 000/1200

= 1791N×m

The flux per pole is

F = 6.28 T/ZI

= (6.28 X 1790)/(486 X 900)

= 25.7 mWb

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