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Capacitors for motor applications, thanks to a very wide choice of models and construction options, offer the ideal solution for any type of application with single or three-phase motors supplied as single-phase.
Single and three-phase electrical motors need, for their starting, a capacitor which generates a displaced current creating a rotating magnetic field. The capacitor can be used also for permanent operation, it maintains the required magnetic field and it compensates for the motor’s inductive load.
There are two types of capacitors used for those applications:
- motor starting capacitors, are electrolytic capacitors with high capacitance value (μF), able to provide a high starting torque to the motor. They are disconnected at the end of the starting in order to avoid overload to the motor winding;
- motor running capacitors, are used to improve the value of the cosϕ when the motor is working at rated load conditions, they are permanently connected to the motor.
When using single-phase motors, the motor running capacitor also maintains the rotating magnetic field. For single-phase motors supplied at 230Vac 50Hz, the value of required motor running capacitors is 30 - 50 μF for kW of motor power.
|Rated Voltage||450 Vac|
|Rated Frequency||50 / 60 Hz|
|Capacitance Tolerance||-/+ 5%|
|Operating Class||400 V – B 10000 h (HPFNT)
450 V – C 3000 h (HPFPU)
|Climatic Category||-25 °C / +85 °C|
|Loss Factor||≤ 5 x 10 ^-4 typical value|
|Test Voltage Between Terminals||1,75 Vn x 2 sec (min.)|
|Test Voltage Between Terminals and Case||2 Vn x 2 sec (min.|
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