Generators and Electric Motors
[Home] - [HELP] - [Forums] - [Groups] - [Classified Ads] - [Subscribe] - [Books] - [Sponsors] -

Go Back   SmokStak > SmokStak® Vintage Electrical Equipment > Generators & Electric Motors General Discussion
Forgot Password? Join Us!

Notices

Generators & Electric Motors General Discussion Antique Generators and Old Electric Motors: Questions and answers about restoring and showing old power generation systems.

Generators & Electric Motors General Discussion

Chinese generator help


this thread has 8 replies and has been viewed 3797 times

Reply
 
Thread Tools Display Modes
  #1  
Old 05-24-2008, 08:40:29 AM
butchfig8 butchfig8 is offline
Registered
 
Join Date: May 2008
Location: carlton mn
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Question Chinese generator help

Have small 1000w, 110v Chinese generator, no name on it.
Has small gas 4 cycle eng, quit working wile running
Is brushless, two blue wires and two black wires come
out of the field wiring. The two black wires are
connected to a bridge rectifing diode,
The two black wires test grounded to the case ??
I do not think the bacl wires should ring grounded to the case.
Can you find me a answer to this
Reply With Quote
Sponsored Links
  #2  
Old 05-24-2008, 01:37:36 PM
Jim Rankin Jim Rankin is offline
Registered
 
Join Date: Nov 2004
Location: Faunsdale, Alabama USA
Posts: 4,436
Thanks: 71
Thanked 1,185 Times in 967 Posts
Default Re: Chinese generator help

You don't say whether the other (blue) wires are the 110 v output wires or what? I doubt the ones connected to the rectifier bridge are supposed to be connected to ground, but you might want to disconnect them from the rectifier and see if perhaps the problem is in the stator, bridge or the exciter field.

Any chance of a drawing of the layout of the generator wiring?
Reply With Quote
  #3  
Old 05-24-2008, 10:01:24 PM
K D Redd K D Redd is offline
In Memory Of
 
Join Date: Nov 2004
Location: Southwest Missouri
Posts: 5,348
Thanks: 166
Thanked 1,196 Times in 1,057 Posts
Default Re: Chinese generator help

Are you sure the diodes are a bridge rectifier OR just two diodes in a package that looks like a bridge. I made this mistake on a generator I worked on last spring which had went down during the Jan. 2007 ice storm. The packsge the diode were in looked like a bridge. I installed a bridge which burnt out. I measure the windings powering the deoide and it was grounded. I intalle another bridge BUT I did not connect rhe negative terminal to anything. In fact I cut it OFF. The generator left the shop with the owner and it generated power. If there is only two diodes in the package the center point of the windings feeding the diodes will be grounded to the case.

Kent
Reply With Quote
  #4  
Old 05-25-2008, 09:41:56 AM
Fred M. Fred M. is offline
Registered
 
Join Date: Sep 2006
Location: Titusville, Florida, U.S.
Posts: 808
Thanks: 34
Thanked 156 Times in 150 Posts
Default Re: Chinese generator help

Butch-

Kent is most likely correct. The Black wires to the rectifier are probably for charging an automobile battery, and may not have any effect on AC power generation unless there is a short circuit.

I think the wires are coming from the stator, not the field, since it is a brushless design. The Blue wires would be the AC output, assuming they are connected to the AC electrical outlet.

The field would be the Rotor winding. It should have one or two diodes mounted on it. A bad diode would cause AC output to fail.

There should also be two more wires connected to a Capacitor. The capacitor may have failed, causing the AC output to fail.

Fred
Reply With Quote
  #5  
Old 05-31-2008, 09:54:43 AM
butchfig8 butchfig8 is offline
Registered
 
Join Date: May 2008
Location: carlton mn
Posts: 7
Thanks: 0
Thanked 0 Times in 0 Posts
Default Re: Chinese generator help

Found a elect diag. looks close. Grounded black wire is the DCWinding in the middle of the page.
Tried gen with Grounded black wire disc. no luck.
12Uf cap test good, is not in the diag. Runs from output side of AC ckt breaker to white wire winding, lowest winding on the page. Cap on correct position ??
Attached Thumbnails
Click image for larger version

Name:	Gen Elect Dia 1000W elec diagram.jpg
Views:	182
Size:	35.1 KB
ID:	34347  
Reply With Quote
  #6  
Old 05-31-2008, 02:18:12 PM
BTPost's Avatar
BTPost BTPost is offline
Moderator
 
Join Date: Jan 2005
Location: Excursion Inlet, Alaska USA 99850-0090
Posts: 4,832
Thanks: 519
Thanked 1,817 Times in 1,200 Posts
Talking Re: Chinese generator help

I don't see ANY connection to the Input of the Exciter Winding (FW) other
than the Block you show a Diode. In order to get power out you have to have
power into the Exciter Winding, from the Diode Block thing, and you show no
other connections to that Block, and unless it has a self-contained Battery
Source, it can't exciter the Genend. The DC Winding (DCW) is the DC Output
source. The AC Output Winding (MW) is the Stator Winding, but your diagram
shows NO Exciter input power source, and without that you are not going
to be generating and power, anywhere.
__________________
Bruce in alaska
Reply With Quote
  #7  
Old 05-31-2008, 02:32:30 PM
Fred M. Fred M. is offline
Registered
 
Join Date: Sep 2006
Location: Titusville, Florida, U.S.
Posts: 808
Thanks: 34
Thanked 156 Times in 150 Posts
Default Re: Chinese generator help

Butch-

What if the diagram is in error? You can see that the left-hand "MW" (Main Winding?) winding, appears to have taps at the top and just below the top, on the side that is jumpered to the frame (neutral). If these taps are actually where the wires for battery charging are connected, that would explain continuity between the black wires and ground.

If the diagram is correct, and there is actually a separate winding for the battery charger circuit, then there could be a short circuit between that winding and the main AC winding, or between that winding and the frame.

Did you disconnect all wires to the bridge rectifier? A shorted diode would be a problem regardless of how it is wired.

If it worked initially, then the capacitor is probably connected to the right place.

Bruce-

I think "FW" is the rotating field winding with its diodes.

Fred
Reply With Quote
  #8  
Old 06-09-2008, 11:44:18 PM
russcomp russcomp is offline
Registered
 
Join Date: Jun 2008
Location: So IN.
Posts: 19
Thanks: 0
Thanked 1 Time in 1 Post
Default Re: Chinese generator help

did you fix it ???
Reply With Quote
  #9  
Old 06-10-2008, 12:56:14 AM
BTPost's Avatar
BTPost BTPost is offline
Moderator
 
Join Date: Jan 2005
Location: Excursion Inlet, Alaska USA 99850-0090
Posts: 4,832
Thanks: 519
Thanked 1,817 Times in 1,200 Posts
Talking Re: Chinese generator help

That could be Fred, BUT that winding needs to get energized from SOMEWHERE, and according to your diagram it isn't connected to ANYTHING,
but the Block with a diode Symbol in it. No Field current, NO OUTPUT. it really
is as simple as that.
__________________
Bruce in alaska
Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

F o r u m Jump

Similar Threads Chosen at Random
Thread Thread Starter F o r u m Replies Last Post
new Chinese ST generator head KeithW Generators & Electric Motors General Discussion 7 07-17-2007 12:12:17 AM
chinese parts HBurk Hit & Miss Gas Engine Discussion 10 05-12-2005 08:16:55 PM


Use "Ctrl" mouse wheel to change screen size.
All times are GMT -4. The time now is 07:32:52 AM.

Smokstak and Enginads site search!


All use is subject to our TERMS OF SERVICE
SMOKSTAK® is a Registered Trade Mark - A Community of Antique Engine Enthusiasts
Copyright © 2000 - 2019 by Harry Matthews P.O. Box 5612 - Sarasota, FL 34277