hey there guys, there are a few questions that i need help here.
hopefully u guys could provide me the solutions for these
questions...many thanks
Q1. The input to a
220V DC shunt motor is 11kW.
Calculate:
a) the iron and
mechanical losses in the system;
b) the output
power developed;
c) the
efficiency;
d) the speed at
this load.
The particulars of the motor are as follows:
No-load current:
5A
No-load speed: 1150rpm
Armature resistance:
0.5W
Shunt field resistance:
110W
Q2. A DC shunt motor has armature and field
resistances 0.4W and
110W respectively. The applied voltage source is 220V. The motor
works at full load speed of 1000rpm and draws a total current of
32A. The iron and mechanical losses are 300W.
a.
Draw the circuit diagram of this motor.
b.
Determine the counter EMF induced in
the armature.
c.
Determine the output power of the motor.
d.
Determine the output torque of the motor.