ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Calling all Non-US members!! (Non-US only)
by Bill Addiss. 08/13/18 05:52 PM
Upgrade the old panel
by gfretwell. 08/13/18 12:20 AM
depth of duckbank
by ghost307. 08/12/18 09:26 PM
Section 179 vehicle purchases
by BigB. 08/05/18 01:06 PM
Don't you buy this stuff
by BigB. 08/05/18 01:00 PM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
1 registered members (mbhydro), 5 guests, and 17 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
3 phase motor questions #207019
09/14/12 07:44 PM
09/14/12 07:44 PM
N
niki  Offline OP
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:
Re: 3 phase motor questions [Re: niki] #207024
09/14/12 08:50 PM
09/14/12 08:50 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,997
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

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
togol
togol
NW In. USA
Posts: 421
Joined: September 2005
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
248,588 Are you busy
186,319 Re: Forum
175,778 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.013s Queries: 15 (0.003s) Memory: 0.9430 MB (Peak: 1.0590 MB) Zlib enabled. Server Time: 2018-08-18 01:16:18 UTC