Magnetism, Transformers and Motor/Generators - Study Material and Solved Assignments

MAGNETISM, TRANSFORMERS AND MOTOR/GENERATORS
MAGNETISM, TRANSFORMERS AND MOTOR/GENERATORS
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MAGNETISM, TRANSFORMERS AND MOTOR/GENERATORS
Induction motor and generator
TASK ONE
The diagram below illustrates a simple single phase generator, illustrating the permanent
magnets, load commutators among other key components of a generator (M.V.Bakshi, 2010).
When the above-drawn generator is operating, the operation waveform of EMF induced against
the angle cut between the magnetic flux and the conductor ∅ is illustrated in the diagram below;

MAGNETISM, TRANSFORMERS AND MOTOR/GENERATORS
From
EMF E = 2NBLvsin θ . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
Where N is the number of turns, B is the magnetic flux density, L is the length of the magnet
(Krishnan, 2011). And v is the velocity.
N= 350
B= 1.75 T
L= 0.095 m
Speed = 103 RPM
V= ( 103
6 ×2 πrdas/s ) ( 0.0 65
6 )

MAGNETISM, TRANSFORMERS AND MOTOR/GENERATORS
V= 10.787 × 0.0325
V = 0.3507m/s
For the maximum EMF induced θ=900 for which the sin is 1 (Oatley, 2012). Therefore the EMF
maximum is obtain as below using equation1 above;
E= 2NBLvsin θ
E= 2× 350×1.75×0.0950×0.3507×1
E= 40.8127V
Part six
Part A: Battery
The battery is used to provide electrical energy as well as the current which will flow and cut the
magnetic field which will, in turn, induce a motion of the motor given in the diagram (Sahay,
2014).
Part B: Conductor loop
Conductor loop is very important in DC motor as it is employed as the conductor which cuts the
magnetic field to induce the motion of the motor.
Part C Carbon brush
Carbon brush is employed to transfer electrical energy from outside of the electric motor to the
rotating coil in the middle of the motor (Chapman, 2012). These devices always undergo a lot of