A116

DESIGN: Electrotor-BladeMotor ~ Power Train

Notes:

Consider eliminating the planetary gears and replacing the spiral bevel with a face gear or 9:1 - 10:1 straight tooth bevel gear.

Notes on Power Requirement:

2 separated disks will need 20 hp.

Interleaving will need 25 hp.

Intermesh (synchropter) will need < 30 hp.

Small gap Coaxial or 4 blade single hub will need 30 hp.

(i.e. 20 * 1.42 = 30 hp)

Interleaving has less blade interaction between rotors then synchropter.

It looks like the motor RPM below should be increased to 6000 RPM or leave the ratio at 9:1 and take the rotor RPM up to 650 (Mach 0.5; Tip speed = 562 fps)

Initial guestimate.

	Speed:		Power:		Torque:
	Ratio:		Loss:
Motor	5500	rpm	10	hp	9.55 (13.0)	lbf-ft (Nm)
Primary: (planetary)	3:1	: 1	1.0	%
Intermediate:	1833	rpm	9.9	hp	28.4 (38.5)	lbf-ft (Nm)
Final: (crown and pinion)	3:1	: 1	1.0	%
Rotor:	611	rpm	9.8 * 2 = 19.6	hp	84.2 * 2 = 168.4 (228.3) ⁽¹⁾	lbf-ft (Nm)
Total:	9.0	: 1	2.0	%

(1) times 2 rotors.

For preliminary understanding see: DESIGN: Single-Bladed All Electric Rotor- Power Train - Crown & Pinion Gears

It looks like the motor speed under load will be 5,000 to 5,760 rpm. The rotor speed will be 600 RPM. So the reduction will be about 9:1.

Drive through 3:1 1-stage planetary gear box and 3:1 spiral bevel in rotor hub.

Information on Planetary Gearboxes:

http://www.acpd.co.uk/sei/s/1488/f67.pdf

Remotely Possible Option:

Consider one face gear set, and locate the motors in the root of each blade.

Face gear Info: OTHER: Mechanical - Gear - Face

Initially displayed: July 23, 2006 ~ Last Revised: April 22, 2010

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