FCN3925A564K

Film Capacitors – FCN3925A564K Application Field and Working Principle

Film capacitors or motor run capacitors are used in numerous applications, including for AC motor start-up and running, resonant circuits, and for lower inductance alternative to bulkier electrolytic capacitors. They are also often used as low cost decoupling capacitors. The FCN3925A564K film capacitor is a cost-effective, non-polarized motor run capacitor, which offers superior performance in working with AC motors.

The FCN3925A564K capacitor consists of wound polypropylene film that is oxided with high voltage. It is a welded type motor run capacitor which allows simpler manufacturing than traditional capacitors while maintaining superior performance. The polypropylene film is highly reliable, due to its great temperature and frequency stability, as well as its ability to carry high ripple currents.

FCN3925A564K motor run capacitors are available in a variety of different capacitance values, and range from 4 μF to 10 μF. This versatile range means they are suitable for most applications, ranging from heating and air conditioning, to major appliances such as washing machines and refrigerators. The capacitance of this motor run capacitor is chosen according to the size of the motor.

Motor run capacitors just like FCN3925A564K are mainly used to increase the speed of the induction motor. This is achieved by providing a static phase angle displacement between the supply current and the external magnetic field flux. The greater the phase angle displacement the greater the speed of the induction motor. This occurs when the capacitor is used in series with the starting winding of a single phase induction motor. The capacitor phase shift is greater than that of the starting winding, leading to a greater phase angle displacement and higher motor speed.

The internal structure of the FCN3925A564K runs capacitor consists of two parts, capacitor and discharge device. The capacitor’s electrodes are made up of two dielectric films and the two conductive layers, which functions as the external functionality of the capacitor - to store the energy and necessary for electric current transmission. The other part is the discharge resistor or diode, which is used in the particular situation when the capacitor has to discharge quickly. The discharge resistor is designed so as to not induce inrush current into the capacitor and consequently a minimal time is required for the capacitor to discharge quickly and safely.

To ensure reliable, trouble-free operation, it is important to check that the capacitor voltage is not too low or too high. It is also important to make sure that the capacitor is mounted securely. The physical stability of the unit should also be checked, and the leads should be securely bolted to prevent any loosening. Furthermore, when the capacitor is being handled, it should be stored in a clean and dry environment, and it should be free from any dust or dirt. It is strongly recommended that good quality capacitors such as FCN3925A564K are used and that the testing and maintenance of all capacitors are done regularly, as this will significantly increase the chances of reliable and trouble-free operation.

Conclusion

The FCN3925A564K motor run capacitor is suitable for a wide range of applications, with its high reliability and variable capacitance. Its features make it well-suited for AC motor start-up and running, resonant circuits, and as a cost-effective decoupling capacitor. The internal structure of this film capacitor utilizes a discharge resistor and two dielectric films, with secure connection at the leads. To ensure reliable and safe operation, it is important to check for physical vibration and voltage stability, as well as keep the capacitor free from dust and dirt. Regular testing and maintenance is highly recommended in order to maintain optimal performance.