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Thread: SOFT START FOR ROTOR SPINUP MOTORS

  1. #1

    SOFT START FOR ROTOR SPINUP MOTORS

    THERE ARE ALOT OF GUYS THAT USE STARTERS FOR CARS TO SPIN UP THEIR ROTORS. THAT IS ALOT OF LOAD FOR THAT MOTOR. DOES ANYONE KNOW OF A SOFT START SYSTEM THAT IS AVAILABLE TO HELP WITH THE INITIAL LOADING?? THANKS ME THE JOE

  2. #2
    Joe, Were trying to come up with something better. As of now, best is a golf cart unit.

  3. #3
    PRA Secretary JOHN ROUNTREE 41449's Avatar
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    I had hoped someone with more than just reading experience about these would have chimed in by now.

    IIRC most use golf cart type system as Brent described. What I've seen so far is they use a very large resister (some are just large springs) inline to burnt most the power before it reaches the motor wires. So only a little power is delivered at first so = slow start. Eventually it will then power up. Now I could be way off.
    But either way this is a huge waste of electricity to just turn into heat instead of driving the motor.

    There is so much better ways of doing this with the new modern motors. Now that comes at a cost because most only buy parts for one. Part of PRA's open source projects is to buy parts in volumes where we are almost mass producing them. Only many members may just buy all the components and put them together and do all the labor themselves = same sweat equity.
    We are looking at some very powerful other less expensive motor options too in the private thread. Now how CLOSE to the SAME COST PRA is able to create a new much more powerful pre-rotator will be one of our main priorities.
    Last edited by JOHN ROUNTREE 41449; 01-13-2015 at 03:04 AM.
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  4. #4
    I have a Yard Machines riding mower, and it uses a slow-release clutch. The clutch can be controlled to control the speed of the machine in any gear. Dump the clutch, and it engages in a 2-second period to full speed. Ease the clutch out a little bit, and it will run the machine slowly, such as when you want to circle a tree, etc.

    The clutch as a split pulley, so you can bring the pulley sides together quickly, or keep them apart and vary the apparent gear ratio to control the speed on the driven side. The same principle is used in CVTs (constantly variable transmissions) on modern automobiles.

    The idea is simple and cheap to make. The hard part would be to make it lightweight. These trannys are expensive in cars, but cheap when made to deal with the few horsepower needed in a prerotator.

  5. #5
    PRA Secretary JOHN ROUNTREE 41449's Avatar
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    Hi Rodger can you take a picture and post it. Sounds promising!
    PRA- Director
    PRA- Volunteer Coordinator

    PRA31 - Vice President of S.D. Rotorcraft Club
    http://www.Pra31.org

    U.S. Agent for Aviomania Aircraft... the most stable gyroplane on the market today.
    See: Aviomania USA http://www.AviomaniaUSA.com

    OEM Dealer for MGL Avionics - glass cockpit EFIS for Experimental aircraft Ask about DISCOUNTS for PRA MEMBERS

  6. #6
    John, I checked out my mower, and the pulley is not split. The pulley has deep sides, with a slow taper toward being closer near to the hub. The idler pulley can keep the belt out near the edge of the drive pulley, making for a high "gear ratio." If you let the clutch out some more, the belt moves progressively closer to the hub, making the drive pulley turn faster. The system is less complex than a CVT setup, thereby cheaper. Maybe one of our engineering talents will read this and come up with an inexpensive drive setup for our prerotators.

  7. #7
    PRA Secretary JOHN ROUNTREE 41449's Avatar
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    Oh I've seen that set-up before. Interesting.
    PRA- Director
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    PRA31 - Vice President of S.D. Rotorcraft Club
    http://www.Pra31.org

    U.S. Agent for Aviomania Aircraft... the most stable gyroplane on the market today.
    See: Aviomania USA http://www.AviomaniaUSA.com

    OEM Dealer for MGL Avionics - glass cockpit EFIS for Experimental aircraft Ask about DISCOUNTS for PRA MEMBERS

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