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Why do Ac fan motor need to add capacitor

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Why do Ac fan motor need to add capacitor

  • Categories:Industry News
  • Author:
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  • Time of issue:2021-03-15
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(Summary description)Ac fan motor plus capacitor is necessary, because 220 volts single-phase voltage itself (also called phase voltage) has no phase angle, while household Ac fan motor consists of a main winding and a secondary winding (also called auxiliary winding )consist of.

Why do Ac fan motor need to add capacitor

(Summary description)Ac fan motor plus capacitor is necessary, because 220 volts single-phase voltage itself (also called phase voltage) has no phase angle, while household Ac fan motor consists of a main winding and a secondary winding (also called auxiliary winding )consist of.

  • Categories:Industry News
  • Author:
  • Origin:
  • Time of issue:2021-03-15
  • Views:0
Information

Ac fan motor plus capacitor is necessary, because 220 volts single-phase voltage itself (also called phase voltage) has no phase angle, while household Ac fan motor consists of a main winding and a secondary winding (also called auxiliary winding )consist of.

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The secondary winding must be connected in series with the capacitor so that the electromagnetic field angle of the secondary winding surpasses the primary winding, so that an angular tension magnetic field is generated in the motor rotor to make the rotor rotate. Only the three-phase power supply (line voltage) has a phase of 60 degrees between phases. Angle, so the three-phase Ac fan motor does not need a starting capacitor. The main function of the electric fan capacitor is that the capacitor and the inductance in the electric fan have a phase shift function. The terminal voltage of the capacitor lags behind the current by 90 degrees, and the terminal voltage of the inductor leads the current by 90 degrees. This is the result of the phase shift of the capacitor and inductance. Let's talk about the phase shift of the capacitor. As soon as the capacitor is energized, the circuit will charge the capacitor and the instantaneous charging current is the maximum value and the voltage tends to zero.
As the capacity of the capacitor increases, the current gradually decreases, and the voltage gradually increases to the end of the capacitor charging, the capacitor charging current tends to zero, and the capacitor terminal voltage is the maximum value of the circuit. This completes a charging cycle. If you take the terminal voltage of the capacitor as the output, you can get a phase-shift voltage that lags the current by 90 degrees.
Because of the self-inductance, the inductance always hinders the characteristics of variable changes in the circuit. The phase shift situation is just the opposite of the capacitance. When the circuit is turned on, the inductor terminal voltage is the largest and the current is the smallest.
At the end of a cycle, the minimum current of the terminal voltage is large, and the result is a phase shift effect with a voltage leading by 90 degrees. It is said that lagging or leading by 90 degrees is only for pure capacitance and pure inductance, and there is no pure capacitance or pure visual perception in practical applications. Therefore, the phase shift effect of a capacitor or inductance cannot be exactly 90 degrees behind or ahead.

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