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Flap Motor Circuit using Bosch Ice Cube relays

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nuckolls.bob(at)aeroelect
Guest

Posted: Wed May 19, 2010 4:22 pm Post subject: Flap Motor Circuit using Bosch Ice Cube relays

At 11:20 AM 5/15/2010, you wrote:

 	  Quote: 	
		  



Came across this: Simple tidy and inexpensive.



http://www.electricscooterparts.com/relays.html



and then look at "Wiring instructions"


	


     I'm mystified as to how the designer of

     this circuit intends the circuit to be used.

     There is no OFF for the motor . . . only

     FWD and REV.



     The classic reversing system for PM motors

     looks more like this.



http://www.aeroelectric.com/PPS/Flight/Flaps/Flaps_3.pdf



     You use the same SPDT relay as the diagram

     cited earlier but the control switch is a

     CENTER OFF device that allows BOTH relays to

     be relaxed in the OFF or no-motion mode.



     Note that in the OFF position, both relays

     are relaxed and the wiring places a dead short

     across the motor. This is ESPECIALLY useful in

     PM motors to supply electro-dynamic braking

     to the motor. Coasting is reduced to a small

     fraction of what you get when you simply open

     the motor's power circuit to shut it off.



     When the center-off switch is moved to either

     extreme, one of the two relays is energized

     causing one lead of the motor to be connected

     to DC power while the other remains at ground.



     Powering the motor with opposite polarity

     by energizing the other relay produces oposite

     direction of rotation.



     Bob . . .

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jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Sat May 22, 2010 7:00 am Post subject: Re: Flap Motor Circuit using Bosch Ice Cube relays

When I looked at it, I too didn't get how one would use it because there was no null point. Just thought there was something that the electron cognosenti would understand and explain it to me!    



J

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