There are two common types of motor capacitors.
Box fan run capacitor.
Reverse the leads on the capacitor.
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The start capacitor gives a fan motor the torque it needs to start spinning then stops.
A motor capacitor such as a start capacitor or run capacitor including a dual run capacitor is an electrical capacitor that alters the current to one or more windings of a single phase alternating current induction motor to create a rotating magnetic field.
Below is the circuit diagram of split phase induction motor in a ceiling fan clearly showing a capacitor connected in series with the starting winding auxiliary winding.
Motor capacitors are used with air conditioners.
Before go in details about why a capacitor is connected in series with the auxiliary winding let is know what will happen if there is no capacitor in a ceiling fan.
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The capacitor on an electric fan is called a run capacitor as opposed to a start capacitor that gives the needed extra torque for some motors to start.
Look for movement of the needle on the meter toward infinite ohms.
A start or run capacitor can be combined into one capacitor called a dual capacitor with three leads but can be split between two separate capacitors.
Place the leads of the ohm meter on the wires that run from the capacitor to the motor.
The dual rated run capacitor is a continuous duty capacitor designed for use in air conditioning condenser units.
If the meter doesn t move toward infinite ohms the capacitor is bad.
It saves space by combining two capacitors in one.
The run capacitor is used with capacitor start run and permanent split capacitor psc motors.
Count to three while the leads on the meter charge the capacitor.
While the run capacitor stays on giving the motor extra torque when needed.
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