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Discussion Starter · #1 ·
I moved my extractor into the honey facility and today after anchoring it down I started it up. It is very noisy. A loud electric motor hum.
How do I quieten it down?
 

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I moved my extractor into the honey facility and today after anchoring it down I started it up. It is very noisy. A loud electric motor hum.
How do I quieten it down?
Slather the bearings in honey.
 

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Ian, "phases" is a reference to 3 phase electrical power. Essentially, sjj is suggesting that you may not have hooked the wires to the extractor back up the same way after the move.


In USA and Canada, the AC distribution network is based on 3 phase AC which is likely to have 3 'hot' wires, plus maybe a neutral. Typically, small users such as residences do not get 3 phase power and only have 2 'hot' wires plus neutral. 3 phase is a more efficient way of powering large motors, and is preferred for industrial uses, but 3 phase power may not be available at every power pole. In my case, 3 phase distribution stops about 1 mile from my property.

In locations without 3 phase, equipment with motors designed for 3 phase can still be utilized IF you were to install a phase converter to feed the motor.
 

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Discussion Starter · #6 ·
The motors are not running on 3 phase power.
I think the difference is that the extractor is running in a large echoey room as compared to before. I need to somehow eliminate that hum which is vibrating through the machine.

Does powering the motors on 220v help?
 

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Ian, assuming you are running 3 phase your motor may be running backwards, you will need to check the direction of motor rotation. If indeed your motor is turning the wrong direction all you need do in take just 2 of the 3 hot wires that Graham spoke of and reverse them. In other words disconnect 2 of the wires and switch them, this will change motor rotation to the other direction. It is very possible that this is the source of your noise. :)

Edit: oops I was typing while you were posting.
 

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Three phase NEVER has a neutral unless you are just running one leg such as 208.
Three phase is power 120 degrees offset potential.
Single phase 220 is 180 degrees.

Ian, if you have the option to run 220, (I don't know if you do) the motor will run cooler and quieter.
 

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Make sure your connection to the source of power is tight and secure and making good contact.
Is the new footprint of the extractor on solid flooring ?
Also need to be level and plumb if the motor is mounted horizontal.
You may have damaged the bearings and thrust bearings while moving.
Check all the mounting bolts also.
If none of that works to quieten it, try removing the motor and running it on the bench. It it is noisy running on the bench the bearings may need replacing at a motor shop or install new.
 

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Maybe it's a resonance issue? A different coupling might help isolate the motor vibration from the extractor. Lovejoy for example. Rubber or urethane between the motor and it's mounting surface might help too.
 

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I think zhiv9 may be on the right track. It could be that the extractor is torqed/stressed slightly differently than it was due to the move if the mounting surface has some irregularity (or is flat but the previous surface was irregular).


> Three phase NEVER has a neutral unless you are just running one leg such as 208.

If the machine has non-motor loads as well as the 3 phase motor, there may be a neutral to allow those non-motor loads to utilize single phase power. For instance, a press with a 3 phase motor may also have an ordinary light bulb to allow for inspection of the work, so the cable from the wall to the press would have 3 'hot' wires plus neutral, plus possibly a separate ground.


 

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Discussion Starter · #12 ·
Thanks guys, your feedback is all very useful. Ill let you know how I make out. Im also going to be talking to my electrician.
 

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I must support Rader, the "Y" three phase I worked with had a neutral that was used to power control circuits, but it was Nazi power.

I also support the divide and conquer, slip the belt off and listen.


crazy Roland
 

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The motors are not running on 3 phase power.
I think the difference is ....
Is it a capacitor induction motor ? Electrolytes in these capacitors change over the time and they lose their ability to shift the phase.
 

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Discussion Starter · #15 ·
Would a capacitor change do anything to quieten down the motor ?

I talked to my electrician and we removed the motors and he figured the motors are as quiet as I can expect. It's the vibration they are sending through my machine. It's acting kinda like an amplifier. In looking into rubber mounts.
 

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If the device was quieter before the move than something has changed dealing with the move. I suspect level and plumb of the machine or something has shifted. Loose bolting or mountings ?
Good luck to you and hope it is solved quickly!!!
 

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Would a capacitor change do anything to quieten down the motor ? ....
Motorcapacitors change their capacitance with time.
The wrong value of capacitance results in torque pulsations at full speed.

“If a wrong capacitance value is installed, it will cause an uneven magnetic field which causes the rotor to hesistate at those spots that are uneven,
which can be observed as uneven motor rotation speed, especially under load.

This hesitation can cause the motor to become noisy,
increase energy consumption, cause performance to drop, and cause the motor to overheat.[3]”

http://en.wikipedia.org/wiki/Motor_capacitor

It is wise to have a spare motorcapacitor handy in case you need to change one very quickly in usually unexpected circumstances.

Johann
 
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