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Pulse width modulation on linear actuators

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nuckollsr(at)cox.net
Guest

Posted: Mon Feb 19, 2007 3:22 am Post subject: Pulse width modulation on linear actuators

At 07:29 AM 2/17/2007 -0800, you wrote:



 	  Quote: 	
		  



Thanks Bob & sorry for the delay, the actuator takes 5 amps at rated load.

Tim


	


  That's a boss-hog trim motor. Do you know how

  much it draws as-installed? The pitch trim actuator

  on a Lear 35 draws 16A at rated load for the actuator

  (2500 pounds) but draws only 2A in worst case

  for normal flight (about 300 pounds).



  Bob . . .



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

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

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

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tim2542(at)sbcglobal.net
Guest

Posted: Mon Feb 19, 2007 9:02 am Post subject: Pulse width modulation on linear actuators

I don’t know yet Bob, the spec I gave is from the mfg and I'm sure is worst

case, I imagine in this lightly load application, it will be

 >.5 amp.

Thanks, Tim



--

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nuckollsr(at)cox.net
Guest

Posted: Wed Feb 28, 2007 2:20 pm Post subject: Pulse width modulation on linear actuators

At 02:39 PM 2/28/2007 -0600, you wrote:



 	  Quote: 	
		  

<docyukon(at)ptcnet.net>

Bob      I also am in need of a speed controller to slow down a linear

actuator that I intend to use for my manually in-flight adjustable prop. I

have a Werner Electric actuator  rated at 1.3a  no load and 5.9a  full load

(75 lbs)  Full load speed .6 in. sec.  no-load speed. 1 in sec.I should need

only about 25 lbs force.  My question is, If I use your Dimmer ckt, as shown

in the earlier attached PDF link, What are the component values that should

be used to build it.  And  can I expect app 1/3 force at 1/3 speed?


	


      There's a LOT of misconceptions about speed controllers

      for motors and their effects on performance . . . particularly

      under varying loads.



      A dropping resistor tends to be a constant current source and

      will it does slow the motor down, it also limits stall torque.



      A REGULATING adjustable voltage source such as the linear

      regulators (described on my website) will hold constant

      voltage irrespective of actuator load and therefore does

      not seriously limit the actuator's torque. Duty cycle (pulse

      width) controllers behave similarly.



      I think the dimmer circuit fabricated with an LM338K

      (5A regulator) will do  what you want done. The values of

      components are probalby in the ball park for the voltage

      range you need too.



      Bob . . .

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