In the same way, let us take another example:Ĭalculate starting capacitance for single phase 70 Watts, 220 V, 50 Hz, 85% efficiency fan. The voltage range for the capacitor should be 440V min. Hence 1 HP Motor required 24.66 ♟ capacitance to start the motor smoothly. N is equal to the ratio between the main/auxiliary winding turns. The above formula is used to find the approximate voltage across the capacitor.Ĭalculate the rated required capacitance value for the single-phase, 220V, 1 HP, 50Hz, 80% of the motor.Ĭ (♟) = 746 x 80 x 1000 / (220 x 220 x 50) = 24.66 ♟. The voltage rating of the capacitor is equal to the product of the voltage measured at both ends of the main winding in volts and the root of one plus turns ratio n square. Learn More: KSEB bill calculator & KSEB Consumption (unit) reading Calculator The calculation for Voltage Rating of the Capacitor: For a DC motor, measure the resistance between the 2 armature wires. Hence while increasing the motor size, the size of capacitance also will be increased. For the winding resistance use an ohmmeter, like Chromas 16502 Milliohmmeter. Look at the formula, the required capacitance value is directly proportional to the motor power. The formula for calculating capacitor value isĬ (♟) = (P (W) x η x 1000) / (V (V) x V (V) x f) The single-phase capacitance C (♟) in microfarad is equal to 1000 times the product of power P (W) in watts and efficiency η divided by the product of voltage V (V) in volts square and the frequency F (Hz). Selection of right capacitor for single-phase motor is really tough, it could lead to starting the motor or not. Initially single phase motor needs little rotor push to rotate the rotor at the rated RPM. Single-phase motor Capacitor Calculation Formula: Enter the input voltage, motor power in watts, efficiency in percentage, frequency, then press the calculate button, you get the required capacitance value.
0 kommentar(er)
