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Europa XS with ULPower 260i engine

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vaughnray(at)bvunet.net
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Posted: Tue Jan 08, 2008 4:56 pm Post subject: Europa XS with ULPower 260i engine

I have received the following reply from the  ULPower representatvie to my question, "Why do I not need to include crowbar OV  protection with this engine?"

  

    Our  electronics guy sent me a diagram showing the principle of how our type of  regulator works. He says (in Dutch below) that:

   

 our  type is a "shunt" regulator which shorts the PMG to ground when the battery  voltage increases above the nominal level so that the battery can never be over  charged and damaged.

 The  principle of a PMG is different to a Regulated Field Generator (typical in  cars) where the magnetic field is regulated to vary the voltage of the  generator.

 A PMG  acts as a constant current source and therefore may be shorted  out.

   

 The  regulator / rectifier we use is typically used on large capacity motorbikes and  our supplier says they are very robust.

  

 He  also sent the attached schematic:

  

 So as  I see it, the attached schematic for my airplane should be  sufficient.

  

 Vaughn  Teegarden

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nuckolls.bob(at)cox.net
Guest

Posted: Sat Jan 12, 2008 11:40 am Post subject: Europa XS with ULPower 260i engine

At 05:14 PM 1/8/2008 -0500, you wrote:



 	  Quote: 	
		  

I have received the following reply from the ULPower representatvie to my 

question, "Why do I not need to include crowbar OV protection with this 

engine?"

Our electronics guy sent me a diagram showing the principle of how our 

type of regulator works. He says (in Dutch below) that:



----------

our type is a "shunt" regulator which shorts the PMG to ground when the 

battery voltage increases above the nominal level so that the battery can 

never be over charged and damaged.

The principle of a PMG is different to a Regulated Field Generator 

(typical in cars) where the magnetic field is regulated to vary the 

voltage of the generator.

A PMG acts as a constant current source and therefore may be shorted out.



----------

The regulator / rectifier we use is typically used on large capacity 

motorbikes and our supplier says they are very robust.



He also sent the attached schematic:



So as I see it, the attached schematic for my airplane should be sufficient.



Vaughn Teegarden


	


    What you've proposed will be fine. The regulator

    topology you cited is a carry through of the

    earliest PM alternator regulators. It throttles

    or controls alternator output to the system by

    putting a dead short on the alternator's stator

    windings during short periods where unrestrained

    output would boost the system voltage too much.



    This is a very simple approach that has been

    effective since day-one . . . but does have the

    down-side of causing the alternator to run at

    max output current 100% of the time whether that

    energy is used by the electrical system or not.

    Of course, if wire size and cooling considerations

    for the alternator are carefully addressed, this

    can produce a robust, reliable system.



    Bob . . .

        ----------------------------------------)

        ( . . .  a long habit of not thinking   )

        ( a thing wrong, gives it a superficial )

        ( appearance of being right . . .       )

        (                                       )

        (                  -Thomas Paine 1776-  )

        ----------------------------------------

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vaughnray(at)bvunet.net
Guest

Posted: Sat Jan 12, 2008 4:53 pm Post subject: Europa XS with ULPower 260i engine

Thanks Bob,



I am going down to  LSA show in Sebring, Florida to see the guys who make 

the engine. I hope it works out well for me.



Vaughn Teegarden



---

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