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Thread: Commutator fans

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    Default Commutator fans

    PC fans don't use a commutator, so what is

    Smooth Commutation Drive 2

    https://www.amazon.com/Noctua-NF-R8-...1551483&sr=8-3

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    Quote Originally Posted by ashiekh View Post
    PC fans don't use a commutator, so what is

    Smooth Commutation Drive 2

    https://www.amazon.com/Noctua-NF-R8-...1551483&sr=8-3
    Marketing. I think they've just borrowed the term.

    PC fans CAN use an (actual) commutator.... but it wouldn't make sense given today's brushless motor designs.

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    Yeah... it's not commutation as in "old school, pre-brushless" commutation.

    I found this: https://www.digikey.com/en/articles/...e-a-bldc-motor

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    Hadn't realized that this brushless technology had already made its way to power tools.

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    Default

    Quote Originally Posted by Jon Gerow View Post
    Yeah... it's not commutation as in "old school, pre-brushless" commutation.

    I found this: https://www.digikey.com/en/articles/...e-a-bldc-motor
    They're very similar to how a stepper motor or an AC synchronous motor operate, although they can run as induction motors as well.

    I doubt the ones you've linked are truly brushless, though, as they'd have to include a controller to electronically commutate the stator. Fan headers are just PWM switched DC.

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    Quote Originally Posted by gdjacobs View Post
    They're very similar to how a stepper motor or an AC synchronous motor operate, although they can run as induction motors as well.

    I doubt the ones you've linked are truly brushless, though, as they'd have to include a controller to electronically commutate the stator. Fan headers are just PWM switched DC.
    The fan themselves have controller ICs.

    Example: https://www.melexis.com/en/product/M...le-Speed-Curve

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    Quote Originally Posted by gdjacobs View Post
    They're very similar to how a stepper motor or an AC synchronous motor operate, although they can run as induction motors as well.

    I doubt the ones you've linked are truly brushless, though, as they'd have to include a controller to electronically commutate the stator. Fan headers are just PWM switched DC.

    So they can allow slippage?

    How are they not 'truly brushless'?

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