Electrical Engineering - Single Phase Induction Motors

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Single Phase Induction Motors

Why capacitors are used in 1 phase induction motors?

Total Answers and Comments: 5

Last Update: February 26, 2010 Asked by: saktheeshkumar

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Best Rated Answer

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Submitted by: sindhejs

To produce rotating magnetic field you need atleast 2 phase system, that is done by capacitor(splitting the single phase into 2 phase).

Above answer was rated as good by the following members:
mtpsmy, haveasafeday, deepakk.

February 24, 2009 01:28:46

sindhejs

Member Since: February 2009 Contribution: 12

RE: Single Phase Induction Motors

To produce rotating magnetic field you need atleast 2 phase system that is done by capacitor(splitting the single phase into 2 phase).

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Overall Rating: +2

March 04, 2009 07:19:36

mtpsmy

Member Since: March 2009 Contribution: 1

RE: Single Phase Induction Motors

To increase the power factor

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March 06, 2009 08:52:45

Raman Jain

Member Since: September 2008 Contribution: 23

RE: Single Phase Induction Motors

As the single phase winding can'nt produce starting torque a Capacitor is used to create a vector which is 90 deg ahead . So the both will produce a torque .

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March 22, 2009 01:15:38

manojprabu

Member Since: March 2009 Contribution: 5

RE: Single Phase Induction Motors

In single phase induction motor polyphase winding are used for producing rotating magnetic field (single phase produces alternating flux only) to make motor self starting
Since capacitor is used for increasing the starting torque of motor.

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February 26, 2010 01:14:26

R Raghavendran

Member Since: February 2010 Contribution: 2

RE: Single Phase Induction Motors

Single phase induction motors are not self starting because of absence of rotating magnetic field. Hence single phase motors are equiped with auxillary winding along with Main winding and Capacitors to produce phase split of 90 Deg to produce torque sufficient enough to start the motor. The capacitor may be permanently connected or disconnected once the motor starts.

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