Using a 1200 rpm Fluid Coupling with a 600 rpm Motor

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davecassano Member Join Date: Jul 2009 Location: Goshen, Oregon Posts: 9	Using a 1200 rpm Fluid Coupling with a 600 rpm Motor 01/14/2010 1:02 PM
	Hello, my question is about the use of a fluid coupling. We have one that was used on a 300hp 1200rpm motor to drive a huge drum debarker. We want to use the same coupling but drive it with a 300hp 600rpm motor. That is 50% less rpm and I am not sure if the coupler will fully lock up. Am I asking for trouble or could it work at the lower rpm's? Thank you, David Cassano
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DaveB Guru Join Date: May 2007 Location: Ohio. USA Posts: 578 Good Answers: 30	#1 Re: Using a 1200 rpm fluid coupling with a 600 rpm motor. 01/14/2010 1:30 PM
	All else being the same, If you keep the same HP and half the RPM, the torque from the motor is doubled. I would be very surprised if the fluid coupling would like that at all. Not only are you driving it at a RPM much lower, you are also asking it to handle much more torque. Try to get the input/output characteristics of the coupling from the manufacturer. __________________ Everything I know about opera I learned from Bugs Bunny
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nukesub629 Power-User Join Date: Sep 2009 Location: Tulsa, Oklahoma Posts: 123 Good Answers: 4	#2 Re: Using a 1200 rpm fluid coupling with a 600 rpm motor. 01/14/2010 2:56 PM
	Typical full lock up speed on a fluid coupling is at 10% rated speed . . . however this can be a signficant variable depending on the fluid charge in the coupling. __________________ A government big enough to give you everything you want, is strong enough to take everything you have.
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nick name Guru Join Date: Mar 2007 Location: City of Light Posts: 3943 Good Answers: 183	#3 Re: Using a 1200 rpm Fluid Coupling with a 600 rpm Motor 01/15/2010 5:19 AM
	If it is a hydrodynamic coupling then it is a pair consisting of a pump and of a turbine. The torque is proportional to n^2 so that dividing the speed by 2 the torque will be reduced to 1/4. Since for same power at half speed the torque doubles your coupling will only transmit 1/8 of the motor torque.
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You might be interested in: Fluid Couplings, Motor Test Equipment, Motor Repair Services

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