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Fox
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« on: July 09, 2009, 01:49:14 PM » |
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I would like to thank Joe from Michigan for posting the following information on the web for us all to use:
The charging circuit on Chinese scoots is from the stator. Magnets in the flywheel are moved past coils of wire as the flywheel turns. That induces an electrical current in the coils.
The faster the flywheel rotates, the higher the voltage output is. Also, the current generated is AC current as electricity flows in one direction as the magnet approaches the coil and reverses as the magnet moves away.
The voltage regulator/rectifier converts the output from the stator and converts it to something that can be used on the bike. First, it rectifies the
AC current which coverts it to DC current required which is required to charge the battery.
The voltage regulator also determines the maximum voltage delivered to the charging system. A universal standard for charging a lead acid battery whether in a car, truck, or bike is 14.3 volts as ideal. Whenever the rectified voltage output from the stator reaches the ideal voltage, the regulator starts shorting the excess through a diode so the voltage will never exceed the ideal.
OK, that's probably more than most of you wanted to know, but it leads to the test procedure for checking the function of the charging circuit and what and why the numbers should be as stated.
First, check the voltage at the battery terminals with nothing turned on.
It's a 12 volt battery so the voltage should be 12 volts. If the voltage is much less, then it would be best to charge the battery before going on to the next steps but not absolute necessary.
Second, check the voltage at the battery terminals with the engine running and at idle. The voltage should be above 12 volts but not necessarily at the ideal 14.3 volts as the stator flywheel is turning slow and may not be putting out enough voltage. Anything here that is higher than the measurement above is a good sign.
Third, measure the voltage as you rev the engine. The voltage should climb as you rev until it gets to about 14.3 volts and go no higher. If you find this to be the case, the charging circuit is operating as it should and there is no problem with it. However, not all regulators are exact and not all volt meters are exact, so lets say any thing from 14 to 14.5 should be great. In this case, if the battery continues to run down in a short period, then the battery is at fault or an electrical component on the bike draining the battery but certainly not a problem with the charging circuit.
For step three, if the voltage climbs higher than ideal then it is likely that the diode in the regulator has burned out resulting in, perhaps, enough voltage to blow all the bulbs on the bike and maybe a few other things. The regulator should be replaced as soon as possible in this case.
For step three, if the voltage is lower than ideal then your battery is not being charged properly and there is a problem with the charging circuit and not the battery. At this point, it is not known weather the fault is in the voltage regulator/rectifier or with the stator. I will suggest here that the voltage regulator is easier and cheaper to replace than the stator so start there. If you can borrow a regulator or have one that you know is good, try that and repeat test three above. If a good regulator does not solve the problem, and all wire connections look good, replace the stator. Sorry.
Another good test that could determine if the stator, rather that the regulator, is faulty would be to measure the resistances of the stator coils and compared to specifications for your particular bike. These numbers are not universal so a general test procedure cannot be recommended.
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« Last Edit: July 12, 2009, 08:56:27 PM by Fox »
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Dave
2005 JMStar Sport 50 4T
2003 Qianjiang 50 2T
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ScooterForumOnline
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« on: July 09, 2009, 01:49:14 PM » |
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scooter_parts
I Like Scooters! --scooter zombie boy
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« Reply #1 on: July 10, 2009, 06:16:07 PM » |
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Is this for a 2t or 4t stator? what size motor?
oilyhans
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« Reply #1 on: July 10, 2009, 06:16:07 PM » |
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Sparky
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« Reply #2 on: July 11, 2009, 12:57:41 AM » |
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All stators work this way, the size of the engine doesn't matter.
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Sparky
Master Mechanic, Electrician,
Tank Urban Touring 250 DE owner
"Great spirits have always encountered violent opposition from mediocre minds."
"Without Deviation from the Norm, Progress is not Possible."
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« Reply #2 on: July 11, 2009, 12:57:41 AM » |
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Scooters
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« Reply #3 on: August 20, 2009, 10:28:47 PM » |
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I would like to thank you also for posting this article. In my understanding that a circuit charges and maintains a battery. The circuit includes a microprocessor for receiving a current sense signal and a voltage sense signal. The circuit includes a current sense circuit for measuring the battery's current consumption and generating the current sense signal responsive to the measured current consumption. The circuit includes a voltage sense circuit for measuring the battery's voltage and generating the voltage sense signal responsive to the measured battery voltage
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« Reply #3 on: August 20, 2009, 10:28:47 PM » |
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jeffdolen
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« Reply #4 on: February 17, 2010, 09:01:55 PM » |
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I placed a brand new GY6 150cc engine into my Lance Venice today. It has a brand new stator. I fired up the engine today and my battery charge has gone from 12.8 to 11.8 in just 20-30 of idle and a little ride around the block.
The 5 wires coming out of my new stator are not the same connectors as my old engine, so ive had to cut the connectors off and individually wire each of the 5 wires. How do I know which of the five wires go where? I know three of them belong together, and then there are two individual wires. I'm assuming this is the cause of my battery not charging. I have tried a series of combinations and all of them result in my volt meter showing .01 drop in volts about every 10 seconds while the bike is at idle.
How do I figure out if my stator wires are hooked up correctly?
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MacMan1999
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« Reply #5 on: June 04, 2010, 03:35:07 PM » |
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Thank you for posting this great article, I have a severe battery drain problem where I can leave the house with a fully charged battery (I use a float charger) and then after a few minutes riding the battery is drained to around 10 volts, first thing I did was replace the battery then I started testing it with a multimeter and that is when the problem was noticed.
As soon as the scooter is started the voltage starts to drop and even reving the engine I hooked up the meter and it was hitting about 8 volts. Now I know that I have to check the regulator and stator.
I currently have a 2006 or 7 Vento Zip r3i, Does anyone know if they are the same parts as a 2003 Geely qt50 or 50qt I think, I have one that I used to use as a parts bike now even though every time I have gone to it for parts they have been different.....
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Fox
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« Reply #6 on: June 05, 2010, 12:52:44 PM » |
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Dave
2005 JMStar Sport 50 4T
2003 Qianjiang 50 2T
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MacMan1999
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« Reply #7 on: June 05, 2010, 03:43:32 PM » |
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Yes they are both 2 stroke... If I need a stator then I will contact you, thanks for the links |
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« Last Edit: June 05, 2010, 03:45:18 PM by MacMan1999 »
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Fox
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« Reply #8 on: June 05, 2010, 04:17:16 PM » |
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Yes they are both 2 stroke...
If I need a stator then I will contact you, thanks for the links
I don't have any stators on-hand but I'll be glad to help any way I can. I would also suggest you join the 49ccscoot.com forum. There's a bunch of guys there who really know the 2 stroke 1E40QMB engines like yours inside and out. They all have parts sitting 'round and will ship them to you. They may even be able to help you diagnose the problem so you don't end up buying a part or parts you don't need. Here's a link: http://49ccscoot.proboards.com/index.cgi PS: This section isn't really supposed to be used for problems or questions. It's for posting helpful information and links so please start a new topic in the Motor Scooter Forum here: http://www.scooterforumonline.com/index.php?action=forum |
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Dave
2005 JMStar Sport 50 4T
2003 Qianjiang 50 2T
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MacMan1999
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« Reply #9 on: June 05, 2010, 06:59:04 PM » |
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that's okay, I just thought that the ebay links that you posted were yours.. I think I am already a member at 49ccscoot.com but had forgotten about that site. I will be sure to go there and bookmark it as will
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Scooter-Trash
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« Reply #10 on: February 23, 2011, 01:58:06 PM » |
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Hey, I am a newbee here.  I have read several posts and like what I have read so far. Got a question. I have a 2005 Roketa 150cc and installed a new motor in it, blew the first one up.  I got to remember it's not a racing bike. Scooters have limits. Anyway I replaced the CDI, Voltage regulator/rectifier, carb., starter solinoid. Now, when I started it for the first time it blew every bulb on it. So, I ordered new bulbs and a new rec./reg. Started it up again and it started to overcharge again. I turned it off before I blew the bulbs again. I have ordered another rec./reg. again. Any suggestions on what it could be or what I should do/check before I hook in the new one again. I am not really clear on the wiring for the new one. Oh sorry, it's a 4 wire rec./reg. The wires on my scooter do not match the diagram in the book. But, it's a generic book. So I figured since I had about 14,000 miles on the old motor and electrical parts that the factory wiring is OK. There is one white from the stator, 1 green for ground, 1 red for charging and the running lights and 1 for the brake and blinker lights. I'm not 100% sure how they need to hook into the new rec./reg. Any help would be great. Thanks for reading. |
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Fox
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« Reply #11 on: February 23, 2011, 04:26:43 PM » |
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Did the new engine come with a new stator or did you install the old stator on the new engine?
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Dave
2005 JMStar Sport 50 4T
2003 Qianjiang 50 2T
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Scooter-Trash
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« Reply #12 on: February 23, 2011, 04:31:27 PM » |
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It came with a stator. I got it complete and ready to install. I did wonder if that could the problem.
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Scooter-Trash
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« Reply #14 on: February 23, 2011, 05:04:25 PM » |
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I still have the old one so I can do the swap. Why do you think that's it ??
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