ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Potseal 11
Recent Posts
600 KW 120/208 3 Phase Y protection
by Yooperup. 07/21/17 09:27 AM
1913 American Electrician's Handbook
by gfretwell. 07/20/17 01:08 PM
Green House wiring
by ghost307. 07/20/17 09:10 AM
Permit Snafus...AHJs and Contractors Jump in
by HotLine1. 07/18/17 08:06 PM
New in the Gallery:
SE cable question
Popular Topics(Views)
239,232 Are you busy
174,634 Re: Forum
167,060 Need opinion
Who's Online Now
0 registered members (), 79 guests, and 10 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#207019 - 09/14/12 07:44 PM 3 phase motor questions  
niki  Offline
New Member
Joined: Sep 2012
Posts: 1
san diego,, CA
Hello. I hope that this is the right place for this, but I need some help with a 3 phase motor. I am a glass artist, and have a polishing lathe that is a 5 hp, 3 phase motor turning a spindle on bearings. I have several issues. First, I do not have three phase at my home studio, so got a rotary phase converter. It runs two pieces of equipment for me. After running the lathe for 30 minutes, the shaft at the bearings heats up an awful lot. My infrared only says 130 but it feels hotter than that. It is well greased. When it is not running the voltage is as follows:

a-b 221
a-c 224
b-c 241

on running:

a-b 209
a-c 215
b-c 221

Is that alright, and what should I do if anything about the shaft heat?

Second to that, is there anyway to add speed control to this without reworking the pulleys? The belt is around the shaft, and encased in a cabinet, so I don't know how to adapt that.

Thanks

Dick in San Diego


Tools for Electricians:

#207024 - 09/14/12 08:50 PM Re: 3 phase motor questions [Re: niki]  
HotLine1  Offline


Member
Joined: Apr 2002
Posts: 6,853
Brick, NJ USA
Niki:
The advice I will give you is to consult a local licensed electrical contractor to check your installation.

The forums are not intended to provide 'how to' guidance to DIY people.

This thread is being locked.


John


Member Spotlight
The_Lightman
The_Lightman
Orlando, Fl, USA
Posts: 49
Joined: August 2001
Show All Member Profiles 
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.011s Queries: 15 (0.002s) Memory: 0.7437 MB (Peak: 0.8594 MB) Zlib enabled. Server Time: 2017-07-23 12:32:48 UTC