Spindel Motor Options?

[Ark1]

Well the 1.8 KW motor on my TOS FN20 burned open a winding on the spindel.

Looking now for opinions.

Option 1 is to have the motor rewound, $600

Option 2 is to find another motor and install it in the machine. A used motor is about $200 but may only be 2HP not 2.5 as this is a Euro motor.

Option 3 is to find a 240 volt VFD motor drive package and bump up the motor to 3 HP and abandon the 600 volt phase converter all together. I did see some for sale on ebay in the UK. Currently have not seen anything in the USA or Canada yet.

Just remember the configuration of my Mill requires a frame type motor that belt drives the mill head gear box, so a water cooled spindel or head mounted VFD motor will not work.

My thoughts are to go with the single phase VFD as my mill conversion was set up for this change in the future with a supply panel located at the milling machine. The VHD would be controlled by the mill contactor to energize the VFD package, not interup the out put of the VFD to the motor.

Since this was a way in the future option when I did not research this option but it is now something that I should get moving on to get my mill back on line.

Thanks for the help.

Ark1

[Al_The_Man]

For my money I would look at 220v 3ph motor and 1 phase in to a VFD.
Depending on what features you want to retain on the mill I would look at a vector rated VFD and if funds allow it, P.G. or encoder feedback.
By frame type do you mean C face? These are readilly available unless it is an odd ball metric?
Al.

[Ark1]

Thanks for the reply Al.


First off the frame on the motor has a 4 bolt flange, not a C face, but as always everything is metric, 24MM shaft and space is a consideration. Because the motor is inside the mill I only have a 7 1/2" x 7 1/2 motor size alloted for a swap.

Could you explain the term vector rated? Then why bother with an encoder as the mill head is belt connected and slip is going to happen.

When I get back on my own computer I will send a link from the UK ebay site showing the package VFD and motor.

Ark1

[m_c]

I can't help with specifics, but when looking at motor/VFD options in the UK a few months ago, I stumbled across Inverter Drive Supermarket - Variable Speed Drives from 0.1kW to 3mW, and their prices were quite good, especially if buying some of their motor/VFD packages.
I ended up repairing my existing setup, but still have them bookmarked for any future projects.

[Al_The_Man]

Originally Posted by Ark1 Could you explain the term vector rated? Then why bother with an encoder as the mill head is belt connected and slip is going to happen. Ark1

The cheaper versions are V/F, voltage/frequency control, the next up is the vector drive which electronically attempts to keep the rpm stable by taking a snap shot of the current electrical conditions, these also have self tuning usually.
Vector refers to the optimum angle of stator current to rotor position.
The more accurate is vector with motor feedback type.
If slip is a problem, is it possible to fit a toothed or other belt?
Al.

[Ark1]

At toothed belt.

Nothing is impossible, just getting there is more of an issue.

The motor for the spindel is in the bottom of the machine. The gear box for the spindel which goes from 25 RPM to 2500 RPM is in the top of the machine. The belt joining the two is 8 feet long. That will be some toothed belt that would be required.

Ark1

[Ark1]

See this link.

3HP 240V IMO INVERTER, 2.2KW 3PH MOTOR & REMOTE PACKAGE on eBay (end time 12-Apr-11 22:31:53 BST)


http://cgi.ebay.co.uk/IMO-INVERTER-3...item230ef23c0d

This one has the correct shaft diameter for my pulley. Athough no mention of shipping to Canada.

Now I will be honest I don't know if this is a good unit or not, or if it will do what I want it to do.

I required 1740 RPM in the head gear box. Seeing that the 2 HP failed, I am thinking here that I would bump the head up another horse power to 3HP.

The British VAT ( value added tax at 20% is in this price) so I suspect with shipping face value is what it will cost.

Opinions?


Ark1.

[Al_The_Man]

I have not experience with that particular make.
You shouldn't have to pay VAT if it is exported?
I couldn't find the Manuf web site either?
Al.

[UUU]

Originally Posted by Ark1 See this link. 3HP 240V IMO INVERTER, 2.2KW 3PH MOTOR & REMOTE PACKAGE on eBay (end time 12-Apr-11 22:31:53 BST) IMO INVERTER 3-PHASE MOTOR & REMOTE PACKAGE 3HP 240V on eBay (end time 08-Apr-11 09:42:03 BST) ..................... Opinions? Ark1.

I have dealt with this firm, as have other people I know and they are good people. They are not the cheapest, but they know what they are talking about. You could call them to discuss your needs, they are helpful.

Sorry - To clarify, it's the first firm I was talking about. I know of the second firm but have not dealt with them, but their reputation is good.

[Ark1]

Both UK vendors replied with spec sheets so that I could figure out what size motor I have in the machine. The frame and shaft size match the motor I have in every detail.

It appears that the motor is Metric, surprise on that one. Motor Frame is 90L. Also I have limited space to install a new motor. The old motor was 1.8 KW which works out to be about 2.5 HP. I took the motor apart and have one winding that is burnt. No varnish on the 1 coil. Looking at the voltages on my phase converter I had 620, 620 and 648. ( open circuit voltage ) That inbalance caused the burn up and the over loads were turned up an amp to compinsate. Well I am where I am and must go forward.

Due to the frame size I can bump up the motor to a full 3 HP 3 phase or 2.2 KW. I can supply the motor with 240 volts single phase. The one motor comes with a pendant for speed control which for my application would be handy as I still use the mill in manual mode from time to time.

See pictures. The motor mount plate is cast and is massive. The other picture is of where the motor sits in the bottom of the mill. The existing motor is only 7 1/2" x 7 1/2" there is only about 3/4" clearance for the motor to slide in there, I have to go with a metric motor again.

Ark1.

[rmarchjr]

Ark,

Have you tried Siemans, they are a bit pricey but they have EURO motors for everything. I have beat the ---- out of them and never killed one, ever. Mutiple crashes when I first started - we often run them 3-4days strait on large dies.
I know it sounds like the Germans have brainwashed me, but they are awesome.
In that size range I bet you increase the power&rpm in same physical size...
Just a thought.

Good Luck

[Ark1]

Do you have a link to a Vendor for a motor and drive package.

The internet is so useful it is over whelming which now brings it back to being useless.

Getting lost in the mire is one of the casualities of the Web.

Ark1