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Original question:

DC link capacitor for BLDC motor drive suggestion

TIDA-010056: TIDA-010056

Alihussain Vohra
Prodigy 60 points

Can you provide equation to DC-link capacitance for inverter or bldc motor driver ?

  • 0
    TI__Intellectual 2305 points

    Hi，

    The capacitance of dc-link capacitor depend on many factors as below,
    1. Capacitor material and type
    2. Ripple current on capacitor
    3. Temperature range, temperature profile, cooling
    4. Input DC/AC ripple voltages, minimum input voltage
    5. Allowed ripple voltage and frequency
    6. Maximum power and current
    7. pwm frequency for inverter
    8. motor parameters, phase inductance

    You can refer to this formula to simple calculate the capacitance C = Vbus / (32 ∗ L ∗ ΔV ∗ fpwm^2), the ΔV depends on voltage and current ripple, power.Or you can start with a 1W~1uF electrolytic capacitor.

    Actually, this is a complex question, you can search more paper or thesis from website.

    Thanks!

    Jenson