ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#102848 - 02/02/07 08:45 PM 2 Phase Motor
RobbieD Offline
Member
Registered: 02/23/03
Posts: 231
Loc: Canada
Just a question about motors. What is a two phase motor? I have installed single and three phase ones but I have always been curious what 2 phase motors are and where they are used.



[This message has been edited by RobbieD (edited 02-03-2007).]
Top
Tools for Electricians:
#102849 - 02/03/07 07:22 AM Re: 2 Phase Motor
bigrockk Offline
Member
Registered: 01/25/03
Posts: 174
Loc: Middle of Canada
Top
#102850 - 02/03/07 03:06 PM Re: 2 Phase Motor
Scott35 Offline

Broom Pusher and
Member
Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA
2 Phase Induction Motors were once the Industry Standard items - back in the early 1900's.

The 2 Phase Polyphase AC System was used in many areas, and was derived either solely from 2 Phase 4 Wire Distribution, or from 3 Phase 3 Wire Distribution - which was the more common method.

Variations of the 2 Phase Systems + Motors sprouted into some currently used types.

Small Dry-Type Polyphase Transformers are connected as Open Delta "Tee", which was a very common connection technique for 2 Phase 4 Wire Systems derived from 3 Phase 3 Wire Distribution.
These currently used Open Delta Tee Systems range up to 15 KVA, with Voltage Ratings of:

* 480 VAC x 208Y/120V 3 Phase 4 Wire,

* 480 VAC x 240/120V 3 Phase 4 Wire Delta,

* 480 VAC x 240V 3 Phase 3 Wire Delta,

* 600 VAC x 208Y/120V 3 Phase 4 Wire,

* 600 VAC x 240/120V 3 Phase 4 Wire Delta,

* 600 VAC x 240V 3 Phase 3 Wire Delta.

There are also 2 Phase 3 and 4 Wire Servo Motors in use today, for AI (Robotics) and related applications.

Scott35
_________________________
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Top
#102851 - 02/03/07 05:48 PM Re: 2 Phase Motor
RobbieD Offline
Member
Registered: 02/23/03
Posts: 231
Loc: Canada
Thanks for the answers. I understand what they are more now. I guess they are motors that use two different phases so they don't rely on a capacitor for the phase shift like single phase motors. I just never saw one before and was curious to what they were all about.
Thanks again.
Top
#102852 - 02/03/07 10:43 PM Re: 2 Phase Motor
Scott35 Offline

Broom Pusher and
Member
Registered: 10/19/00
Posts: 2707
Loc: Anaheim, CA. USA
Forgot to mention:

Check the Technical Reference Section, for Schematics and some details regarding 2 Phase Motors + Transformer Connections.

Refer to the Menu For Technical Reference Area http://electrical-contractor.net/ubb/Forum15/HTML/000064.html
For links to the 2 Phase related pages.

Scott35
_________________________
Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
Top
#102853 - 02/04/07 01:53 PM Re: 2 Phase Motor
RobbieD Offline
Member
Registered: 02/23/03
Posts: 231
Loc: Canada
Thanks Man!
Top

Member Spotlight
Member Since: 07/05/02
Posts: 8211
New in the Gallery:
SE cable question
Featured:

2017 NEC and Related
2017 NEC
Now Available!

Shout Box


Who's Online
0 registered (), 75 Guests and 10 Spiders online.
Key: Admin, Global Mod, Mod
 
New in the Gallery:
SE cable question
 
Top Posters (30 Days)
Admin 49
HotLine1 43
gfretwell 18
Ruben Rocha 12
Trumpy 9
 
Newest Members
Freecrowder, clee512, Jdscott2005, FAIZAN, Regitest2

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals