What is Single Phase Induction Motor ? (LIKE+SHARE+SUBSCRIBE) Visit at http://eeeclass.blogspot.com BUY Electrical and Electronics books from amazon store http://astore.amazon.com/eeeclass-20 Single phase induction motor is mostly used in home, office, shop and many single phase appliances like pumps, ceiling fan, washing machine etc. Single phase induction motor is less efficient than three phase induction motor but three phase power is mostly available in large industrial places. Single phase induction motor is not self starting motor. Single phase induction motor have one main winding in the stator with this winding by adding another winding (auxiliary or starting) and resistance or capacitor in series or parallel we can make single phase induction motor self starting. Single phase induction motor are Shaded pole induction motor Split phase induction motor Capacitor start induction motor Capacitor start capacitor run induction motor

1. Single Phase
Induction Motor

2. • Single phase induction motor is mostly used in
home, office, shop and many single phase
appliances like pumps, ceiling fan, washing
machine etc.
• Single phase induction motor is less efficient than
three phase induction motor but three phase power
is mostly available in large industrial places.
• Single phase induction motor is not self starting
motor.
• Single phase induction motor have one main
winding in the stator with this winding by adding
another winding (auxiliary or starting) and
resistance or capacitor in series or parallel we can
make single phase induction motor self starting.

3. • Single phase induction motor are
Shaded pole induction motor
Split phase induction motor
Capacitor start induction motor
Capacitor start capacitor run
induction motor

4. Shaded pole induction motor

5. • Shaded pole motor looks like a transformer with
motor actually induction motor is a rotating
transformer.
• An auxiliary winding is copper ring surround each
pole added with main winding for starting purpose.
• When the current flows through auxiliary winding it
produces flux which is unequal.
• Flux in shaded pole and in unshaded pole opposes
the main winding flux which rotates the rotor.
• Stator have salient poles and short circuited
copper turn called shading coils.
• The rotor of shaded pole motor is squirrel cage
rotor.
• Shaded pole motor is less costly.

6. Split phase induction motor

7. • Split means break up or divide.
• Split phase induction motor consists of main
winding and auxiliary winding or starting winding
and a centrifugal switch.
• Starting winding is placed at 90 degree electrical
with main winding.
• Centrifugal switch is on at starting and it splits the
auxiliary field winding when the motor start
running.
• Main winding have low resistance and high
reluctance and auxiliary winding have high
resistance and low reluctance.
• Its construction is simple.

8. Capacitor start induction motor

9. • Capacitor start induction motor is similar to split
phase induction motor but starting torque of split
phase induction motor is less so by adding a
capacitor in series with centrifugal switch and
making similar electromotive force in main and
auxiliary winding.
• So it makes capacitor start induction motor more
costlier than split phase induction motor.
• The capacitor is electrolytic capacitor whose value
is about 3 to 20 micro farad.
• Capacitor start induction motor is use where high
starting torque is required.
• Capacitor start induction motor is use for fan,
pumps, compressor etc.

10. Capacitor start capacitor run induction motor

11. • Capacitor start capacitor run induction motor
works like three phase induction motor at some
point.
• Consists of two capacitor one in series with
centrifugal switch (capacitor start) and one in
parallel (capacitor run).
• The capacitor run is disconnect after starting of
motor but capacitor run is still connected via
auxiliary winding.
• This gives better power factor and improves
efficiency.
• Capacitor start capacitor run motor have smooth
torque and silent operation.
• It is uses where silent operation is required.