Usually the installation instructions with the fluid coupling tell you. What do yours say ■

That's it for me. ■

That's it for me. ■

You can have either way - the maximum torque will change plus if you have under speed or high over temp protection > your detection method will need to change.

I prefer to have the motor carry the self weight of the coupling as it is better suited than a smammer shorter gearbox inoput shaft

Thanks

James ■

You can have either way - the maximum torque will change plus if you have under speed or high over temp protection > your detection method will need to change.

I prefer to have the motor carry the self weight of the coupling as it is better suited than a smammer shorter gearbox inoput shaft

Thanks

James ■

Originally Posted by bunny

well, when u puttin fluid coupling b/t gearbox n motor.........which side the flexible element should come?...............motor side or gearbox side........n y?

If there is a rotational vibration calculation, then the parts must be mounted in that calculated order.

If there is a fluid coupling, is there also need for a flexible coupling?

have a nice day

Teus ■

Originally Posted by bunny

well, when u puttin fluid coupling b/t gearbox n motor.........which side the flexible element should come?...............motor side or gearbox side........n y?

If there is a rotational vibration calculation, then the parts must be mounted in that calculated order.

If there is a fluid coupling, is there also need for a flexible coupling?

have a nice day

Teus ■

Originally Posted by Teus Tuinenburg

If there is a fluid coupling, is there also need for a flexible coupling?

All the fluid couplings I know incorporate a flexible coupling. ■

Dear all,

When one of my conveyor's fluid coupling oil was very low, the conveyor speed became less. ( The Zero Speed Switch had been not in line ). So the material tonnage per meter increased. After sometime the motor was tripped on overload.

I am wondering that when the fluid coupling oil is low, the motor ampere will go less or more? Or does it depend on the fluid coupling mounting. Obviously ( fortunately ) in my case, the ampere had gone up.

In above fluid coupling , the motor is rotating the inner wheel which cannot be seen from the outside. The outer casing with delay chamber & flexible coupling is connected with the gearbox input shaft.

Thanks & regards, ■

Dear all,

When one of my conveyor's fluid coupling oil was very low, the conveyor speed became less. ( The Zero Speed Switch had been not in line ). So the material tonnage per meter increased. After sometime the motor was tripped on overload.

I am wondering that when the fluid coupling oil is low, the motor ampere will go less or more? Or does it depend on the fluid coupling mounting. Obviously ( fortunately ) in my case, the ampere had gone up.

In above fluid coupling , the motor is rotating the inner wheel which cannot be seen from the outside. The outer casing with delay chamber & flexible coupling is connected with the gearbox input shaft.

Thanks & regards, ■

Personally with a belt conveyor (or elevator) which has a friction drive I'd be fitting a rotation monitor set at 80% of normal running speed. ■

Dear Mr.Designer,

How did you come to the value of 80% ? Is there any standard values available?

Regards, ■

Dear Mr.Designer,

How did you come to the value of 80% ? Is there any standard values available?

Regards, ■

Hello all

I've just posted an article on the Consultants forum that you may all (assuming you all get a copy of this) be interested in. This post seems to bear out how complicated

working with fluid drives are. I prefer to term fluid drive though they are the same as fluid couplings. As is mentioned you need a coupling on a shaft to shaft

arrangement, thus the fluid part is not a true coupling.

My posting:

Fluid Drives have been a main driving force in starting conveyors for many many years. All the time they operate trouble free, all is not so bad, well you do have to keep fluid and spare fusible plugs in stock. But when they give you trouble its normally big trouble! And the trouble can be numerous, over loading needing to stop the drive and wait for the fluid drive to cool down. Plugs leaking spilling fluid on your product, potential for a human accident. We've even known them to explode!

Alternatives to fluid drive have never been that simple. Do you go down the electronic route? Eddy Current drives? An alternative has never been that simple, until now!

MagnaDrive Couplings and Adjustable Speed Drives (ASD) come with all the benefits of fluid drives and more. MagnaDrive are 'high energy rare earth permanent magnetic couplings' These rare earth magnets drive through a gap of air. These couplings offer all the positive features of a fluid drive without any of the draw backs:

No precision alignment during installation

No oil to contend with i.e storage, topping up, safe disposal, risk of spillage.

No requirement for the device to cool down after an overload phase.

No spare parts to keep in stock.

No maintenance requirements.

No requirement for a flexible coupling.

MagnaDrive has the advantages that a fluid drive would bring:

Soft start and soft stop.

Energy Saving.

Handles overload phases.

Overload Protection.

In addition a MagnaDrive:

Has ease of installation. Laser alignment is a customer option.

Vastly reduces and in some cases eliminates vibration.

Deals with shock loads.

Both these abilities extends the life of bearings, seals and motor windings.

Protects the motor from a load jam and stoppage.

The motor runs at its optimum speed.

The drive can be restarted straightaway after an overload issue, no cooling down required.

Zero maintenance. Visual inspection can take place with the drive running.

MagnaDrive is the superior option to give true reduction of total cost of ownership:

Reduced maintenance.

No spare parts to hold in stock.

More process uptime.

Attached plant, motors, pumps, gearbox and fans last longer.

More can be found on MagnaDrive at www.magnadrive.com

Want to know more? Make contact with me.

I am Frank Holden. Thank you for taking the time to read this. I trust you find it of interest.

Drive & Coupling Solutions Ltd

M:07595 937519

E:frank@driveandcouplingsolutions.co.uk

W:www.driveandcouplingsolutions.co.uk ■

Hello Frank..

VSD's used to be flavour of the month, but I understand that they are loosing favour quite rapidly as they actually waste alot of energy in the VSD itself , are very expensive, get obsolete and have to be replaced after a while. Also, the lady who makes our tea would not be able to maintain them..(me neither).. S0..

I looked at Magna drives for two very large projects, but could not get good technical information on them.. So I'm back with fluid couplings

I wanted to see the torque-time curves like you get for the good old fluid couplings.

I wanted to know what the actual energy losses are ("Energy saving" is a meaningless statement)

How much coupling slip do you get

What is the maximum allowable start up time.

What are the torque - slip graphs like etc etc etc..

Can you provide such information please?

Cheers

LSL Tekpro ■

Good questions Graham - I am thinking along the same lines as we are currently looking into the Magna couplings as we have a maintenance foerman working here from South Africa that used them there and says they work great.

We currently use softstarts for all of our conveyors and I would like to compare the energy cost savings and mechanical advantages of the Magna couplings. We are not looking at variable speed just the couplings for better start-uip control.

I also have a concern regarding Larry's comments here. https://forum.bulk-online.com/showth...oad-Protection

Frank

Who is the Canadian or North American rep for Magna Drive?

Gary Blenkhorn ■

Graham, Gary hi

I'm so sorry I never responded to you requests back in August last year. I never received any notification emails of your requests, some technical or knowledge issue from me no-doubt. Now and then I have a browse of our forums, as now.

You may have got to MagnaDrive be now, if not I hope you've not lost interest in the technology.

You can email MagneDrive direct at inquiries@magnadrive.com go to their distributors page at http://www.magnadrive.com/aboutmd/distributors.shtml

Their contacts page is at http://www.magnadrive.com/contactus.shtml

Sorry you couldn't the information you were after. MagnaDrive have new faces at the top. These guys are very driven, i'd be so shocked if you did not get what you are looking for. If your having any issues please let me know at fah2@mac.com I'll inform these guys at the top.

May your rotating equipment run smoothly and trouble free.

Regards

Frank ■

Originally Posted by sganesh

Dear Mr.Designer,

How did you come to the value of 80% ? Is there any standard values available?

Regards,

There are a lot of things to consider before setting the trip setting of an Underspeed switch, like position of the switch etc.

If the switch is on drive snub pulley 90% is a good setting.This will take care of allowance for slip of belt on drive pulley and slip in the fluid coupling.

If there is less oil in the fluid coupling,there will be reduction in transmission of load and the temperature of oil will rise and the fusible plug will operate.I have seen this many occations.Setting is Percentage of Full load speed and not synchronous speed.

Rgds,

Narayanan Nalinakshan ■

Magna Drive (MD) did visit our office in Nov-Dec(?) 2011 to evaluate CDI prior claims on good and not-so-good performance features for the different MD types.

My partner, Dr. Cornet, built a comprehensive MD simulator to demonstrate performance diffences between all MD types. We were hired by a large user to make this in-depth study. Dr. Cornet demostrated the features of his simulator to MD. I am led to believe MD acknowledged that our understanding to be correct. Dr. Cornet showed some claims made by MD are not true. It is our hope MD will correct their position and give better input on what the various configurations of the MD drives are capable of, and what they are not capable of.

For the record, CDI does believe some MD devices can achieve expectations. Some cannot. They have very different performance features than fluid couplings, depending on the type of MD, as we acknowledge there are very big differences between fluid coupling types.

Know how to engineer the products you use and apply that knowledge to each and every product you recommend. If you are entrusted to engineer, do not recommend what you do not know. ■