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Choosing the Right Working Capacitor for a Motor: Comparing Formulas

andrzej59432 22251 7
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Treść została przetłumaczona polish » english Zobacz oryginalną wersję tematu
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  • #1 16969549
    andrzej59432
    Level 3  
    Hello.
    I would like to know how to choose a working capacitor for a motor. From the information found on the internet I found such patterns:
    C [uF] = (1300 ÷ 2600) × P [W] / U?
    C [uF] = 70uF / 1kW
    C [uF] = 60 * ?P [kW]
    My question is which formula should I use because each capacitor has different capacities?
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  • #2 16969569
    Krzysztof Kamienski
    Level 43  
    Down what engine? Adapted to work with a capacitor or three-phase? Because it is a difference.
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  • #3 16969580
    andrzej59432
    Level 3  
    In general, I'm interested in a three-phase motor, but I would also like to learn about a single-phase one
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  • #4 16969582
    Rysio4001
    Heating systems specialist  
    Hello.

    I'm afraid that none, because the capacitor capacity depends not only on the power and voltage of the motor supply, but also on the way the windings are arranged in the motor, the angle of offset of the starting winding relative to the working one, etc.

    I also know from experience that motors with similar parameters, but from different manufacturers, used different capacities of starting capacitors.

    Greetings.
  • #5 16969623
    Krzysztof Kamienski
    Level 43  
    andrzej59432 wrote:
    I'm generally interested in a three-phase motor,
    Generally, such a motor should not work with a capacitor at all. Poverty, misery and makeshift. There was enough about it in the Forum. Single-phase motors are specially designed to work with a capacitor. Differently shaped, in short.

    Rysio4001 wrote:
    starting capacitors.
    Rather working capacitor since we are talking about a three-phase motor.
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  • #6 16969654
    andrzej59432
    Level 3  
    Krzysztof Kamienski wrote:
    Single-phase motors are specially designed to work with a capacitor. Differently shaped, in short.


    And how does the selection of a capacitor work in a single-phase motor? In new engines, we can probably find it in the catalogs, and what about old machines when we only have the nameplate?
  • #7 16969680
    Krzysztof Kamienski
    Level 43  
    andrzej59432 wrote:
    for old machines when we only have the type plate?
    Then, usually, the capacitor value is given on the motor plate. His operating voltage should be twice the supply voltage. Why Now I will ask :D
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Topic summary

The discussion revolves around selecting the appropriate working capacitor for motors, specifically three-phase and single-phase types. Various formulas for calculating capacitor values were presented, including C = (1300 ÷ 2600) × P [W] / U, C = 70uF / 1kW, and C = 60 * ?P [kW]. However, it was noted that capacitor capacity is influenced by factors such as motor winding arrangement and manufacturer differences. For single-phase motors, the capacitor value is typically indicated on the motor plate, and its operating voltage should be double the supply voltage. The conversation highlights the complexity of capacitor selection and the importance of specific motor characteristics.
Summary generated by the language model.
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