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Tool Talk Discussion Forum

DEK AC Generator Low AC volt Part III

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ernied

11-09-2019 13:58:04




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Tore into the generator end and removed the stator. Found what appears to be a diode, marked plus and minus on the bottom, which is shorted out. The other diode is potted in green, and tests ok.

No sign of a automatic voltage regulator (just a capacitor) and this diode wired into the rotor. Rotor coils each have a resistance of 3.8 ohm.

No part number or other marks than plus or minus.

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JMOR

11-11-2019 09:53:34




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 Re: DEK AC Generator Low AC volt Part III in reply to ernied, 11-09-2019 13:58:04  
Quoting Removed, click Modern View to seeplse post a link



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ernied

11-11-2019 09:08:09




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 Re: DEK AC Generator Low AC volt Part III in reply to ernied, 11-09-2019 13:58:04  
Found the parts!!! On the importers website, did not have much hope. Lets see if they get here.



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JMOR

11-11-2019 05:35:33




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 Re: DEK AC Generator Low AC volt Part III in reply to ernied, 11-09-2019 13:58:04  
Some learning needed fellows.

"A varistor is an electronic component with an electrical resistance that varies with the applied voltage. Also known as a voltage-dependent resistor (VDR), it has a nonlinear, non-ohmic currentvoltage characteristic that is similar to that of a diode. In contrast to a diode however, it has the same characteristic for both directions of traversing current."

My 2 cents says it is a simple diode/rectifier, but press on!

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Billy Shafer

11-09-2019 15:57:28




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 Re: DEK AC Generator Low AC volt Part III in reply to ernied, 11-09-2019 13:58:04  
Some of those gensets are not ment to be repaired. I have seen some with no parts support. And no information on them. Some the parts cost so much. It is cheaper to buy a new unit.



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ernied

11-09-2019 16:52:01




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 Re: DEK AC Generator Low AC volt Part III in reply to Billy Shafer, 11-09-2019 15:57:28  
Yeah, that is what I am fearing. The component was soldered in. More research calls it a varistor.



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Janicholson

11-10-2019 10:07:17




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 Re: DEK AC Generator Low AC volt Part III in reply to ernied, 11-09-2019 16:52:01  
If it is a Varistor, it might be just fine. Put a digital ohm meter across the leads and warm it up with a hair dryer. If it shows change it might be just fine! Jim



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ernied

11-10-2019 11:09:05




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 Re: DEK AC Generator Low AC volt Part III in reply to Janicholson, 11-10-2019 10:07:17  
Well it is shorted. The other pole blocks one way and ohm varies the other.



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Janicholson

11-10-2019 13:02:19




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 Re: DEK AC Generator Low AC volt Part III in reply to ernied, 11-10-2019 11:09:05  
A shorted diode conducts both ways with little resistance. An open diode does not conduct at all. A diode coupled with a heat sensitive resistor does what you are indicating. Jim



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Guido

11-09-2019 18:31:26




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 Re: DEK AC Generator Low AC volt Part III in reply to ernied, 11-09-2019 16:52:01  
Hello ernied,

Ha! Variable resistor...... That could be the invisible regulator?
Can't believe how many parts are no longer avaible, not that old

Guido.



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ernied

11-10-2019 11:07:53




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 Re: DEK AC Generator Low AC volt Part III in reply to Guido, 11-09-2019 18:31:26  
That is the conclusion I have arrived to. The tan circular coil creates a mag field around the end of the rotor, the diode varister rectifies and regulated the field. One diode varister is shorted both ways, the other blocks one way and ohm varies the other. Well I will call tomorrow and continue the quest.



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Jeffcat

11-09-2019 20:15:42




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 Re: DEK AC Generator Low AC volt Part III in reply to Guido, 11-09-2019 18:31:26  
Hey Guido, I'm old enough to know. They came in all kinds of different voltage values. The SK book was full of them. You know those little LED voltage gauges that Radio Shack sold so many years ago. I built one of those from an electronics magazine even before RS sold them. Was just after those diodes came out. Good gravey half the parts in those projects you can't even get anymore.



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Guido

11-10-2019 15:49:28




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 Re: DEK AC Generator Low AC volt Part III in reply to Jeffcat, 11-09-2019 20:15:42  
Hello jeffcat,

When I get a chance I will dump my box of old electronic components on the bench, and post a picture for you. Ceramic caps witb a color code? Many power resistors, eproms and eeproms, transistors, and more. Still have my tack and dwell meter, I built as a kit. Remember heathkit? The timing light finally smoked out. I think he found the way the gen set regulates power out,

Guido.

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