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Thread: Is Flux Braking = Plugging?

  1. #1
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    Is Flux Braking = Plugging?

    Is Flux braking equal to Plugging?

    The braking is by change the order of the phase?

  2. #2
    Join Date
    Jul 2006
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    San Francisco Bay Area, CA, USA
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    No.
    Flux braking is a term that applies to VFDs that have an option for true "Flux Vector Control" (as opposed to the simpler and cheaper "Sensorless Vector Control") In FVC in it's any forms, the VFD control algorithm is capable of, within EACH sine wave going to the motor, separate the flux current vector from the torque current vector. This is part and parcel to why FVC is better, because it can totally separate these values and avoid putting more of the available energy into making the motor into a motor (flux current) vs creating rotation (torque current). BECAUSE of that capability, when a motor is decelerating and regenerating BACK into the DC bus, the FVC capability can force the excess energy BACK into the motor by over-fluxing it, essentially "wasting" that energy back into the motor where it becomes heat. So it's basically the same as Dynamic Braking, but uses the MOTOR as the "resistor" for a place to put that converted kinetic energy. It then of course suffers from the same limitations as DC Injection Braking in that you are thermally stressing the motor. If your braking cycles are few and far between, this is often not too bad of a problem. But you should NEVER use Flux Braking on any high duty cycle application.
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  3. #3
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    Aug 2004
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    Quote Originally Posted by Herbrata View Post
    Is Flux braking equal to Plugging?

    The braking is by change the order of the phase?
    plugging is where a motor is reversed in direction repeatedly. fwd-rev-fwd-rev.... It beats the heck out of the motor and the contactor.
    Bob

  4. #4
    Join Date
    Feb 2016
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    Quote Originally Posted by petersonra View Post
    It beats the heck out of the motor and the contactor.
    As well as the mechanicals connected to the motor!

  5. #5
    Join Date
    Mar 2014
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    South Florida
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    Quote Originally Posted by Jraef View Post
    But you should NEVER use Flux Braking on any high duty cycle application.
    or like a bascule bridge

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