Thread: Indian 3 phase motor and VFD

Hi Mike,

Have you looked at the connector box on the motor? How many terminals? Picture?
You could always leave it in star and make do with 0.33hp.
Assuming it doesnt have the star point bought out, you'll have to dig it out(or have it dug out for you)

Stuart

I might be in luck.........not sure

It doesnt appear so.
So you can either run it as is and have about 0.33hp or go looking(or have someone else go looking) for the star point, change the wiring and then run it with 0.5hp.

Changing the motor(if you mean to single phase) isnt a good idea on a grinder..... so I've read. They tend to vibrate more.

Stuart

Mike, you really go for the top shelf products

Yes that's currently wired in star, normally it's extremely easy to dig out the star point and run the wires back out for delta. If you can use a soldering iron, can get some high temp spagetti, and don't mind disassembling it you shouldn't have any problems at all. It typically takes me around 30 minutes to do one.

If you're scared of the smoke genie, then it will cost you 50-60 bucks to have it done at any motor rewinding company.

But what would I know.

Pete

I'm guessing that you will have access to all the windings from under the terminal connector ... no need to go digging around for the star point.

Remove the terminal connector and see what's there.

Originally Posted by Vernonv

I'm guessing that you will have access to all the windings from under the terminal connector ... no need to go digging around for the star point.

Remove the terminal connector and see what's there.

Yes I will ge the multimeter and have a srounge around in there ...

OK, I've got it pulled apart .

Have colour coded the 3 coils ..blue , purple and green .

Now for some soldering and heat shrink , then back together

MIKE

heatsink? I thought that was a bad thing inside a motor? Though I could well be wrong.

Stuart

Hi Mike,

Stuart is right, the normal thing is to use high temperature sleeving, I think it's available from Jaycar.

That said, I know a lot of motors have pvc insulated wiring...

Were the three extra wires just under the terminal strip, or tied off somewhere else?

Regards
Ray

Originally Posted by RayG

Hi Mike,

I think it's available from Jaycar.

But only in a very limited range of sizes.....limited to two....

Originally Posted by RayG

Hi Mike,

Stuart is right, the normal thing is to use high temperature sleeving, I think it's available from Jaycar.

That said, I know a lot of motors have pvc insulated wiring...

Were the three extra wires just under the terminal strip, or tied off somewhere else?

Regards
Ray

Hi Ray

The three centre joined STAR wires were well hidden . I had to pick them out , it took a while to find them . I couldn't see them until I cut a few of the binding strings and unravelled things .

I didn't know about HT sleeving ..only heat shrink . learn something every day

What do you recommend for sticking it all back together , holding the wires in place . Its been heavily varnished with some type of glue .

MIKE

Mike, the sleeving was what I called spaghetti above. It's old-skool, but the right stuff for the job. You can get some varnish from Jaycar too. The wires normally sit back pretty well, solid core is stiff and holds a shape. Sit them in there, give it a bit of a squirt with varnish, and Bobs your uncle. I told you it was easy

Pete

Originally Posted by Pete F

Mike, the sleeving was what I called spaghetti above. It's old-skool, but the right stuff for the job. You can get some varnish from Jaycar too. The wires normally sit back pretty well, solid core is stiff and holds a shape. Sit them in there, give it a bit of a squirt with varnish, and Bobs your uncle. I told you it was easy

Pete

...or if you are nervous about them moving, you could also use some epoxy glue to insist on where they should stay put at the temperatures they are likely to endure.
Joe

Originally Posted by jhovel

...or if you are nervous about them moving, you could also use some epoxy glue to insist on where they should stay put at the temperatures they are likely to endure.
Joe

I thought cotton thread was the done thing?(doesnt stretch when it gets warm or some such?)

Stuart