The calculation of the capacitance of the capacitor for engine online calculator


Our online calculator will help you in calculating the capacitance of the capacitor for the motor.
To calculate the capacitance of capacitors for motor should be such data as: (the connection of the windings, engine power, efficiency, power factor, voltage), now you know the capacity of the starter (SP) and working capacity (CP) of a capacitor for your engine.
Efficiency (efficiency of motor) is given by comparing the mechanical energy of the motor that consumes the electric motor with energy.
For a motor with a short-closed rotor and with a power of 1-20 kW, (efficiency) is usually equal to 0.78 – 0.87, for example, motor 18 kW loss of 2600 watt is the norm, that's it, this loss is converted into heat which heats up the motor.
Have three-phase motors when connected to the power supply occurs rotating magnetic field, which is the start of the engine, unlike three-phase motors from single-phase in the stator has two windings (and start working), the working winding is connected to single phase power supply directly, and the launcher series with the capacitor, the capacitor is required to create a phase shift between the currents of the working and starting windings and the large torque in the engine occurs when the phase shift of the currents of the windings reaches 90° and their amplitudes create circular rotating field.

Indicate the connection of the motor windings (Y / Δ):

Indicate engine power (W):

Indicate the voltage in the network (V):

Indicate power factor (cosφ):

Indicate engine efficiency, value from 0 to 1:


Capacitor Capacitance (μF):

Capacitor Capacitance (μF):