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why use a run capacitor?

Views:1     Author:Nina     Publish Time: 2019-07-26      Origin:Site

About the capacitors,There are many different types , and different types of capacitors have different functions. In the central air conditioning system, electrolytic capacitors are often used as the filter components in the control circuit, and non-polar capacitors are connected in series in the windings of the compressor (single-phase asynchronous) motor, so that when the motor starting winding is started, the current leads the operation beyond the start-up. The current is at a phase angle to obtain the starting torque, making the motor easy to start.


About running capacitors, they are often associated with starting capacitors.

Single-phase currents flowing through a single-phase motor cannot generate a rotating magnetic field.

Therefore, in a single-phase motor, it is necessary to add a starting winding, and use a capacitor to separate the phases so that the current in the two windings produces a phase difference of approximately 90 , to generate a rotating magnetic field.

The starting winding of the single-phase motor is mostly used when starting. Once the motor is started, the centrifugal switch is used to disconnect the starting capacitor from the power supply, thereby disconnecting the starting winding;

However, there is also an operation mode in which a capacitor (running capacitor) is connected next to the starting capacitor, and the motor is started. In normal operation, the centrifugal switch cuts off the starting capacitor, but does not cut off the operating capacitor and the starting winding.

That is to say, the winding is started and participates in the normal operation of the motor. This capacitor is called the running capacitor.


Why use the run capacitor,The main functions of the run capacitor are as follows:

Run Capacitors are used to phase separate, with the intent of causing a current difference of approximately 90 current in the two groups to generate a rotating magnetic field. In three-phase power, the current between each two phases has its own phase difference, and no phase separation is required. A capacitive induction motor has two windings, a starting winding and a running winding. The two windings are spatially different by 90 degrees.


A large-capacity run capacitor is connected in series on the starting winding. When the running winding and the starting winding pass through a single alternating current, the current in the starting winding is at a 90-degree angle from the running winding current at the moment because of the run capacitor effect, reaching the maximum first. value. Two identical pulsed magnetic fields are formed in time and space, so that a rotating magnetic field occurs in the air gap between the stator and the rotor. Under the effect of the rotating magnetic field, an induced current occurs in the rotor of the motor, and the interaction between the current and the rotating magnetic field occurs. The electromagnetic field torque causes the motor to rotate.


Besides,we also want to introduce the run capacitor made by Jinan RETEK industries inc. ,we have many kinds of run capacitors for you to choose.CBB65,CBB61,CBB60 and so on.

And the voltage could be 110V-300V,250-400V,370-450V.The capacitance is from 2uf to 120uf.

Finally, we also can provide you customized services, we can produce according to your drawing or samples,Please feel free to contact with us if you have any further query.


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