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Flap Motor lack of Oomph

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Wed Mar 24, 2010 1:09 pm Post subject: Flap Motor lack of Oomph

On start up, my long dormant flap motor can't overcome the drag of the linear actuator. The power supply gets pulled down to near zero volts, showing a couple of amps.

When I pulled the motor free of the actuator, it starts reluctantly for a second or so and then quickly spins up to full speed and torque. The actuator input shaft is easily turned by my fingers.

Is this a capacitor problem? I haven't pulled the motor apart yet.



John

enginerdy(at)gmail.com
Guest

Posted: Wed Mar 24, 2010 3:01 pm Post subject: Flap Motor lack of Oomph

Where are you taking the power supply measurement reading "near zero

volts"? ..and by power supply, do you mean the battery,

battery+alternator, bench supply, or something else?



--Daniel



On Wed, Mar 24, 2010 at 4:09 PM, jonlaury <jonlaury(at)impulse.net> wrote:

 	  Quote: 	
		   



 On start up, my long dormant flap motor can't overcome the drag of the linear actuator. The power supply gets pulled down to near zero volts, showing a couple of amps.

 When I pulled the motor free of the actuator, it starts reluctantly for a second or so and then quickly spins up to full speed and torque. The actuator input shaft is easily turned by my fingers.

 Is this a capacitor problem? I haven't pulled the motor apart yet.



 John





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=291588#291588




	


-- 

Daniel Hooper

jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Wed Mar 24, 2010 5:40 pm Post subject: Re: Flap Motor lack of Oomph

Daniel,

My bench power supply has analog meters for volts and amps. When I hook it up to the flap motor/linear actuator, the voltmeter almost pegs 0 volts.



John

enginerdy(at)gmail.com
Guest

Posted: Wed Mar 24, 2010 6:13 pm Post subject: Flap Motor lack of Oomph

John,



It sounds like your bench supply might have a lack of "oomph". Try  

connecting it to a battery. Use a fuse in series with it to prevent  

smoke, just in case you have a dead short across the motor. Good luck!



Daniel Hooper



On Mar 24, 2010, at 8:40 PM, "jonlaury" <jonlaury(at)impulse.net> wrote:



 	  Quote: 	
		   

 >



 Daniel,

 My bench power supply has analog meters for volts and amps. When I  

 hook it up to the flap motor/linear actuator, the voltmeter almost  

 pegs 0 volts.



 John





 Read this topic online here:



 http://forums.matronics.com/viewtopic.php?p=291631#291631

Neal.George(at)hurlburt.a
Guest

Posted: Thu Mar 25, 2010 6:58 am Post subject: Flap Motor lack of Oomph

John - 



Which power supply are you using, and what does the amp meter indicate when

the voltage is sagging toward the peg?



neal




Daniel,

My bench power supply has analog meters for volts and amps. When I hook it

up to the flap motor/linear actuator, the voltmeter almost pegs 0 volts.



John

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Thu Mar 25, 2010 8:08 am Post subject: Re: Flap Motor lack of Oomph

Daniel, thanks for that. I'll check out the motor/actuator with a charged battery today.



Neal, the power supply brand escapes me right now, but when the volt meter pegs, the amp meter shows approx 2 amps. I'll report back with the PS brand tonight.

Bob McC

Joined: 09 Jan 2006
Posts: 258
Location: Toronto, ON

Posted: Fri Mar 26, 2010 6:50 am Post subject: Flap Motor lack of Oomph

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I'll suggest that if the power supply is only capable of delivering a maximum of 2 Amps at zero volts then it is not nearly robust enough to properly run a flap motor. Try a fully charged battery or a power supply capable of supporting a 5 or 10 Amp load at 12 Volts and see if your test results are any different. I suspect that with an adequate supply your motor will run normally.  

   

Bob McC  

   

[quote] --

_________________
Bob McC
Falco #908
(just starting)

jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Fri Mar 26, 2010 7:10 am Post subject: Flap Motor lack of Oomph

The Power Supply is an Astron RS-35M , 13.8v, 25  amps continuous (at) 50% duty cycle. American made in Irvine CA

  

 Daniel was right. It's not a flap motor problem.  The motor perked right up when connected to my car battery.

  

 Anyone have ideas re the power supply? There was an  incident where the positive and negative alligator clips contacted each other.  But the 8 amp fuse of the PS didn't blow so I thought everything was  OK.

  

 J

   [quote][b]

bgray(at)glasair.org
Guest

Posted: Fri Mar 26, 2010 7:24 am Post subject: Flap Motor lack of Oomph

Don’t rule out the motor until you read the amperage draw with a meter.  

     

Bruce

 www.Glasair.org   

  

--

jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Fri Mar 26, 2010 11:24 am Post subject: Re: Flap Motor lack of Oomph

Thanks Bruce. I'll try that today.

Talked to Astron and relayed the problem. The guy directed me to the circuit board in the unit to replace one of the resistors with a higher value one.

It's all kind of wierd, because this thing has worked flawlessly in the past on this same motor. The last time I used it, the outputs contacted, but the fuse didn't blow and the unit still worked fine. 

The literature on their website says that the unit is protected from this kind of event.

ulflyer(at)verizon.net
Guest

Posted: Sat Mar 27, 2010 11:35 pm Post subject: Flap Motor lack of Oomph

Sounds like you may have a lab type bench power supply, many of these also have a current limit setting control.  May be a smaller knob on one of the larger knobs or separate, and turn like a volume control.  It could be set to limit the amount of current the power supply would supply for testing/design applications.

 jerb



 At 08:05 AM 3/26/2010, you wrote:

 [quote]The Power Supply is an Astron RS-35M , 13.8v, 25 amps continuous (at) 50% duty cycle. American made in Irvine CA

  

 Daniel was right. It's not a flap motor problem. The motor perked right up when connected to my car battery.

  

 Anyone have ideas re the power supply? There was an incident where the positive and negative alligator clips contacted each other. But the 8 amp fuse of the PS didn't blow so I thought everything was OK.

  

 J

 

  	  Quote: 	
		  



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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Mon Mar 29, 2010 7:01 am Post subject: Flap Motor lack of Oomph

Jerb,

 I'll look into that but it has powered the same  motor in the past without a problem.

  

 Thanks,

 John

   [quote][b]

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