Best / cheapest way to slow down motor RPM by fixed amount
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  1. #1
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    Question Best / cheapest way to slow down motor RPM by fixed amount

    We have a small 3 phase conveyor (0.17kW, 5A) in our warehouse which was bought for a role which required a fairly high speed, but now we would like to re-use it in a different place where it would need to run about 30% slower.

    I have succeeded in lowering the speed correctly using a (rather expensive) VFD from Schneider that I had available, and which can do all sorts of other things that are useless in this context.

    My question is - has anyone an idea on how to do this in a cheaper way ? I just need to slow the conveyor down by a fixed amount, and then it will never need to change, so basically I don't need about 99.9% of the features in a typical (even low end) VFD

    Thanks in advance !

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    Pix of the drive system please.

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    what about using a gear reduction box. there usually cheap.

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    Quote Originally Posted by climb-101 View Post
    what about using a gear reduction box. there usually cheap.
    I doubt you could do it cheaper than $132- TD200-10P5-1PH, AC Drive, 0.5 HP, 115V 1 PH IN, 230V 3 PH OUT | FactoryMation

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    Pre-VFDs, the solution would have been a simple gearbox. If the VFD solution is working for you (i.e., not running into torque limitations), that's almost certainly the cheapest current solution.

    Keep in mind that VFDs (at least in the low-feature tier) are so cheap, people are using them as point-application single-to-three phase convertors. Basically using none of the VFD control features.

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    Although I agree that a VFD is likely a CHEAPER way to change speed on a DIRECT DRIVE situation, if there is any sort of belt / chain drive involved already, simply changing the sheave / sprocket ratio is usually less expensive. You didn't really say how your conveyor is powered.

    One thing to understand however is that when you lower the speed via mechanical means, you INCREASE the torque. That can be beneficial in conveyor situations. With a VFD, the BEST you can hope for is to not LOSE torque when lowering speed. So if, by decreasing the speed, you increase friction / sticktion, or if that results in MORE product being dumped onto the entire conveyor length, that increased torque might be a necessity.

  8. Likes TDegenhart, sfriedberg, digger doug, 9100 liked this post

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