Item 1751
OTHER:
Helicopter - Inside - Intermeshing - Electric Motor Located in Rotors
SloMoSynchro
(Slow Motor ~ Intermeshing Configuration)
This page maybe changed to that of simply mounting a couple of
ELECTROTOR-SloMo Principal assemblies (motor & rotor) to an intermeshing frame. ~September 18, 2009
Objective:
To locate two ELECTROTOR-SloMo Principal assemblies in a frame that cerates an intermeshing arrangement.
Drawing:
Overview:
Electrotor ~ SloMo; Axial Flux Permanent Magnet [AFPM] motor. Axial air gap. No. probably going with Transverse Flux ~ September 18, 2009
With parallel (but isolated) wiring double or triple redundancy can be incorporated in the; batteries, power circuit and motor. .
The extreme rigidity of the rotor blades and the 5º to 6º precone angle allows the rotors to have a reduced axis angle between them.
Hopefully, [Blade Pitch Control] can also be incorporated.
Direct Control, supplemented by Weight Shift for greater pilot authority. OTHER: Flight Dynamics - Rotor Hub - Offset Bi-teetering
Collective control by hand grip throttle.
Autorotation by automatic entry, with capacitor assisted flare at landing.
Powered by a pair of electric motors, which have 1:1 rpm relationship and direct coupling to their counterrotating rotors. ElectrotorSloMo.
- The mechanically separated motors will allow the rotor-motor assembly to be used in any small recreational twin-rotor helicopter.
~ September 18, 2009
Cyclic Force by the Pilot: For the same effective disk area, the intermeshing may have smaller rotor disk and this may result in a slightly lower pitch-change force by the pilot and a higher roll-change force by the pilot.
Drawing:
Place Intermeshing frame and linkages in here.
Principal Assembly:
Notes:
- The rotor and blades are 'absolutely' rigid.
- The complete assembly pivots longitudinally on a pivot for pitch control.
- The individual rotors pivot laterally on the own pivot for roll control.
- Yaw control will be by
??????? at this point in time (limited opposed longitudinal should work.)
Motor:
This section is probably obsolete.
These drawings:
are from OTHER: Helicopter - Inside - Principal Assembly - ELECTROTOR-SloMo (Ultralight & UAV) They will not be what is wanted and are only here for reference.
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See; DESIGN: Electrotor-SloMo - Motor - Overview - 4-phase for SloMoCo (and Bilateral?)
Synchronization:
For physical intermeshing backup consider having the two or three blades intermesh at the root instead of large teeth on the OD of the hubs
Power Sources:
One heck of a lot of high performance (yet to be developed) batteries. With today's technology the flight time would be logged in minutes.
Generator driven by small (yet to be developed) turbine.
Ground tether containing electrical cable.
Large lightweight Ultracapacitor(s) for flare at the end of autorotation. Could be charged by rotors during autorotation.
Capacitors are very light weight. In fact, there is consideration for using the honeycomb core in a composite construction fuselage as a capacitor/battery.
Principle Assembly for this craft; Electrotor-SloMo ~ Power Storage Devices
Stability:
Have a large coning angle of 4 to 5 degrees.
- To give static stability in forward flight. I.E. to cause the disk to want to tilt back.
- To allow the intermeshing rotors to be located closer to each other.
Control:
Consider using patent US 5,043,641. Have hard copy.
See: Electrotor-SloMo ~ Control (flight & power)
Related Pages:
A Related Patent:
- 4,311,080 US ~ Drive mechanism ~ January 19, 1982 ~~ circular linear induction
Control and UAV:
This small (25 employee) Canadian company interesting. http://www.micropilot.com/. There is an article on it in the business section May 30, 2006 Globe and Mail.
Principle Assembly for this craft; Electrotor-SloMo ~ Control (flight & power)
Idea Related to 2-phase:
See patent; US 4,968,913. When looking at drawing number 1; Consider a Rotor-Stator-Rotor arraignment. Leave the stator as is and make the second rotor a mirror image of the first; to get opposite rotation between the two rotors. Got to check the validity of preceeding statement.
I do not think that this will assure synchronized rotation for maintaining fixed blade-crossing azimuths. Perhaps additional electric items might be added.
What would be the best winding configuration for the stator? - Torus ?
What would be used to start both rotors in the correct direction? A 3rd small starting phase? Or, a few nylon pinion gears between the two rotors so that both can be pre-spun in a counterrotating direction by the hand of the pilot turning the lower one only?
Idea Related to 4-phase:
See A131.html
See; Perhaps Relevant Patents
Concerns:
The resistance of the electric motor to turn (cogging) if no power. Overrunning clutches will overcome this potential problem.
The efficiency (power to weight) of the axial-flux motor.
2P vibration on the absolutely rigid rotor.
Rotor:
Rotorhub:
An idea that is intended to assure that the rotors disks have a small gap while not clashing with each other. xx
Blade:
- The blades should be very lightweight and asymmetrical (VR-7).
Control:
Aerodynamically Active Blade Twist:
[Source ~ MDD p.20] Discuses Drag and Flapping Pivots
[Source ~ MDD p.122] Figure 12 shows coincidental drag and flapping Pivots.
Possibly Related Subjects:
Damper on Rotor Hinges:
Should dampers and/or very strong springs be incorporated into the connecting rods on the bi-teetering rotor heads?
Overhead Control Arm:
Consider making the bar from fiberglass tubing, or other material with elasticity, At a specific frequency, the overhead arm may negate much of the 2P vibration from the rotor during large cyclic positions.
Cyclic Range:
Would a larger range of freely-teetering cyclical movement be better than a shorter range with the control (and associated force and vibration)?
Related Pages:
OTHER: Helicopter - Inside - Coaxial - Electric Motor Located Between Rotors ~ SloMoCo
OTHER ~ Flight Dynamics - Rotor Hub - Aerodynamically Active Blade Twist
OTHER ~ Flight Dynamics - Rotor Hub - Hub Spring (Hinge Spring)
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Initially displayed: August 22, 2009 ~ Last Revised: January 18, 2010
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