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Pulse width modulation on linear actuators

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nuckollsr(at)cox.net
Guest

Posted: Thu Feb 15, 2007 11:39 pm Post subject: Pulse width modulation on linear actuators

At 09:55 PM 2/15/2007 -0800, you wrote:



 	  Quote: 	
		  



Can any one tell if the duty cycle on a PWM will equate at least roughly

with motor speed? ie will a 20% duty cycle slow the motor down to

approximately %20 or does it not work that way? I have a linear actuator for

pitch trim that that travels 2"/sec, I need about .5"/sec.


	




   Probably. PM motors have field fields which makes

   RPM proportional to applied voltage. The RMS (power)

   available from any source is also proportional

   to duty cycle for a non-continuous flow. In any

   case, I presume you're going to make the duty cycle

   adjustable so whether it takes 25% duty cycle

   or 27% duty cycle to achieve exactly the speed you

   want is irrelevant.



   You can also use linear techniques. An adjustable

   but regulated voltage source not unlike the dimmers

   described in . . .



http://www.aeroelectric.com/articles//DimmerFabrication.pdf



   . . . may be considered also. How much current does

   your motor draw at full speed?



   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: Sat Feb 17, 2007 7:30 am Post subject: Pulse width modulation on linear actuators

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

Tim



--

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docyukon(at)ptcnet.net
Guest

Posted: Tue Feb 20, 2007 12:52 pm Post subject: Pulse width modulation on linear actuators

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?

                                                                      Bill 

S.

---

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docyukon(at)ptcnet.net
Guest

Posted: Wed Feb 28, 2007 12:40 pm Post subject: Pulse width modulation on linear actuators

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?

                                                                      Bill 

S.

[quote] ---

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