Comments for Bodine – Gearmotor Blog https://www.bodine-electric.com/blog/ We Drive the World's Leading Products! Wed, 13 May 2020 22:15:45 +0000 hourly 1 https://wordpress.org/?v=6.6.2 Comment on How to Select and Size Gearmotors for Conveyor Applications by Edmund Glueck https://www.bodine-electric.com/blog/gearmotors-for-conveyors/#comment-2 Fri, 09 Aug 2019 11:24:59 +0000 http://gearmotorblog.wordpress.com/?p=1352#comment-2 Comment #1: Many conveyor applications operate in a frequent start / stop environment. Therefore you need to take into account the starts per hour (duty cycle) rating of the motor or gearmotor and may need to use a slightly over-sized motor to dissipate the excess heat that will be generated.

Tech Tip: What I would do in a continuously cycling application is calculate the RMS torque of the load cycle and then pick a gearmotor with a continuous rating that meets or exceeds that RMS torque. Or, if there are size or cost constraints that limit the gearmotor selection, I might choose the largest gearmotor within the size/cost budget and then advise the conveyor designer on the maximum start/stop frequency to advertise for his/her system. And then there’s other considerations for specific motor types, like the centrifugal start switch in split phase motors that isn’t designed for frequent start/stop operation.

Comment #2: What if the gearmotor is not directly coupled to the conveyor, and the design requires a chain or timing belt?

Tech Tip: Chain and belt drives are so common on conveyors that it probably should have been included even in this “basic” reference. The calculation is actually quite simple. If the speed reduction of the chain or belt drive is N:1, then the gearmotor output speed should be N times the speed calculated for the conveyor roller and the torque output should be 1/N times the torque calculated for the conveyor roller.

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