89
Write a paragraph about differences between AC and DC motors
using the following table
Table 7
NO.
AC Motor
DC Motor
1.
Required AC power supply to
run.
Required DC power supply to run.
2.
The AC motor is Simple in
construction than DC motor.
DC Motor is more complex in
construction than AC Motor.
3.
The AC motor is light in weight
than the same capacity of DC
motor.
The DC motor is heavier than the
same capacity of AC Motor.
4.
There
is
no
commutator
mechanism is present.
The DC motor has a commutator
mechanism.
5.
Some types of AC motor have a
slip ring mechanism.
The DC motor has not any slip ring
mechanism.
6.
The single-phase induction motor
is not self-starting.
All types of DC motors are self-
starting.
7.
Single phase induction motor
works on Double Revolving
theory.
Double revolving theory does not
work on any type of DC motor.
8.
There is no extra mechanism is
needed for creating a rotating
magnetic field in three phase
induction motor.
A mechanical or electronic switch is
needed for creating a rotating
magnetic field in brushless DC
motor.
9.
According to the speed equation
of the AC motor, the speed can be
controlled by frequency, poles
etc.
According to the speed equation of
the DC motor, the speed can be
controlled by the supply voltage,
voltage drop across armature, flux
etc.
10. Losses in the AC motor is less
than DC motor.
Losses in DC motor is more than the
AC motor.
11. The efficiency of the AC motor is
greater than DC Motor.
The efficiency of the DC motor is
less than AC motor.
