ElectrotorSloMo

Overview:

Bilateral Configuration: There are two electric motors, one below the hub at each rotor.

Coaxial Configuration: AS above, or, there is one contra-rotating axial flux motor [rotor-stator-rotor] located between the aerodynamic rotors.

Efficiency: A highly efficient motor is extremely important. This is because of the aerodynamic inefficiency of helicopters and the heavy weight of foreseeable batteries.

For optimum efficiency it appears that the eventual motor should have a slotted stator and Halbach magnets in the rotors.

Outrunner vs. Inrunner:

It appears that the inrunner may be preferable to the outrunner. The reasons are.

There will be better cooling of the coils since.
The coils are spaced further apart due to the larger circumference.
The cooling fins of the laminates are spaced much further apart because of their large circumfrence and they are in a higher induced velocity region from the rotor blades.
The bearing(s) for the combined aero and electric rotors will have a smaller diameter and this will result in lower friction and a lower weight thay that of slim-ring bearings.

Requirement for Electrotor-SloMo: To be moved to its own page.

Access, for hover w/ 300 GW etc. gives 6.0 hp for the momentum method and 4.1 for the blade element method. This is for a single rotor therefore the coaxial will be about 8.5 hp and 5.8 hp. This is 18 and 28 lbs / hp to hover.

The Flettner FL-282 had an effective disk area of 1,695 sq-ft and a gross weight of 2202 lbs, giving a disk loading of 1.3 lbs/ sq-ft. Somewhere it mentions 17 lbs / hp to hover.

To lift 300 lbs at 17 lbs / hp to hover (as per Flettner) will require 17.6 hp, which equals 8.8 hp per motor, for the Intermeshing configuration.

For 300 lb GW;

8.8 hp = 6,562 watts.

Amps = watts / volts = 6,562/xxxx = xxxx A per rotor.

Torque = 5252 * 8.8 hp/600 rpm = 77 lb-ft per rotor.

Motor Calculations:

For testing see; OTHER: Electrical - Motor - Testing:

For Motor - Radial Flux - Overview - Fisher & Paykel see; 1905

For Motor - Radial Flux - Overview - Megaflux [Allied Motion] (Bilateral) see; 1899

Working Papers:

DESIGN:

A131

MAKE:

A177

Secondary Group:

		Should some of the following information that is general in nature go into OTHER ~ Electrical Motor?
	Radial Flux Motor:
		Overview:
		Specifications:
		Assembly:
		Stator:
		Rotor: (Armature)
		Miscellaneous:
	Axial Flux Motor:
		Overview:
		Specifications:
		Assembly:
		Stator:
		Rotor: (Armature)
		Miscellaneous:
	Transverse Flux Motor:
		Overview:

Reference Links to AeroVantage Motor
	Motor - Full-size:
	Radial Flux Motor & UniCopter Motor?
		Nothing yet
	Transverse Flux Motor & UniCopter Motor?
		Overview:
		Specifications:
		Assembly:
		Stator:
		Rotor: (Armature)
		Miscellaneous:

Same Page; Different Craft: ~ Electrotor-Simplex ~ Electrotor-Plus ~ AeroVantage ~ UniCopter ~ Single-Bladed All Electric Rotor ~ UniCopter-UAV ~ UniCopter-1097_Wide_Stagger_Electric.dc

General Information: ~ OTHER: Electrical - Motor

Last Revised: March 12, 2010