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  1. #1
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    Bldc motor phase power calculation

    Hello friend, I want to calculate the power driven by the motor while running.
    Used :
    - 1kw 3phase bldc motor and bldc controller
    Now I am driving the motor using controller. The motor is running good.
    Calculate:
    For example say motor is running at 1000rpm. Battery voltage is 48v and consuming 3amp(DC).
    Now I have to calculate the output power in phase ,in order to check how much watts the motor is consuming.
    In motor phase how to check the AC current and voltage using dso. Because the multi meter will read for 50/60hz as AC.

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  2. #2
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    Re: Bldc motor phase power calculation

    Hi,

    All the informations can be easily found in the internet. Did you try an internet search on your own?

    You say "motor" and you say "output power"
    The output power of a motor is the mechanical power. P = M x 2 Ũ Pi x f
    Where "f" is the RPS ( revolutions per second).

    Power at the DC supply:
    P = V_avg x I_avg

    Three phase motor input power:
    P = 3 Ũ V(P-N_RMS) Ũ I(P_RMS) x cos(phi)
    P = phase
    N = neutral

    Klaus
    Please donīt contact me via PM, because there is no time to respond to them. No friend requests. Thank you.



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  3. #3
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    Re: Bldc motor phase power calculation

    Quote Originally Posted by Hal1 View Post
    output power in phase
    Do you wish to see if you can detect whether current is in phase with voltage? Do you wish to adjust component values so as to reduce power factor error?

    This requires that you compare voltage waveform from the supply, with current waveform through an ohmic resistance.



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