Electrotor-Simplex ~ Power Train - Planetary

Where Motor Shaft is Vertical: 1574, 1566, 1568

• Planetary (epicyclical) reducer.
• Maximum torque from Predator 37:
• Input: Q = hp * 5252 / rpm = 20 * 5252 / 6000 = 17.5 lb-ft = 210 lb-in, = 3,361 oz-in. = 23.7 Nm.
• Output at 5:1 will be (*5) = 87.5 lb-ft = 1,050 lb-in, = 16,800 oz-in. = 119 Nm.
• Output at 10:1 will be (*10) = 175 lb-ft = 2,100 lb-in, = 33,600 oz-in. = 237 Nm.
• Output at 12:1 will be (*12) = 210 lb-ft = 2,520 lb-in, = 40,320 oz-in. = 284.7 Nm.
• Hover torque from Predator 37 (12 hp);
• Input : Q = hp * 5252 / rpm = 12 * 5252 / 6000 = 10.5 lb-ft = 126 lb-in. = 2,016 oz-in. = 14.2 Nm.
• Output at 5:1 will be (*5) = 52.5 lb-ft = 630 lb-in, = 10,080 oz-in. = 71 Nm.
• Output at 10:1 will be (*10) = 105 lb-ft = 1,260 lb-in, = 20,160 oz-in. = 142 Nm.
• Output at 12:1 will be (*12) = 126 lb-ft = 1,512 lb-in, = 24,192 oz-in. = 170.8 Nm.
• Potential suppliers:
• Harmonic Drive
• Anaheim Automation
• The GBPN-0402-012-AA171-197. 12:1. Double reduction. NEMA size 17. Is rated at 2,832 oz-in of torque. The input shaft is 5.0mm dia. The output shaft is only 12mm dia. I have 2 of these but they have a single stage 5:1 ratio.
• The GBPN-0602-012-AA231-250. 12:1. Double reduction. NEMA size 23. Is rated at 6,231 oz-in of torque. The input shaft is 6.35mm dia. The output shaft is 17mm dia.
• The GBPN-0802-012-AA341-500. 12:1. Double reduction. NEMA size 34. Is rated at 16,993 oz-in of torque. The input shaft is 12.7mm dia. The output shaft is 17mm dia. It appears that this reducer is rated at 8.4 HP. Other NEMA 34s may be less. The required hover power will be 10 - 11 HP. The weight of a NEMA 34 2-stages is about 11 lbs. Its diameter is 80 mm = 3.15"
• The GBPN-1202-015-AA421-750 12:1. Double reduction. NEMA size 42. Is rated at 36,819 oz-in of torque. The input shaft is 19.05mm dia. The output shaft is 25mm dia. It appears that this reducer is rated at 18.25 HP. The required hover power will be 10 - 11 HP. The weight of a NEMA 34 2-stages is about 24 lbs.
• Also consider the 9:1 double reduction gear units, however they may result in rotors that are rotating too fast.
• The 8:1 is single reduction however it's torque is significantly below the higher ratios.
• I'm assuming that the rated torque of the reducers is the input torque, not the output torque???? This means that the NEMA 42 reducer is the one and it will be heavy. Idea: Buy a NEMA 42 then have an aluminum housing cast or fabricated. Then 'guts' from the purchased unit be installed in the new aluminum housing.
• Would oil instead of life grease lubrication reduce the friction and increase the allowable loading?
• Apex Dynamics Inc. Have hard copy.
• The PG080 10:1 is a single reduction. It Is rated at a Nominal 65 Nm = 9,205 oz-in of torque. (and a Maximum Output torque of 3-times the Nominal) The input shaft is ≤24mm dia. The output shaft is ??mm dia. It appears that this reducer is rated at Nominal 5.5 HP and a Maximum 16.5 HP. The required hover power will be 10 - 11 HP. The weight of this 1-stage is 7.9 lbs. Its diameter is 90 mm = 3.54"
• Strangely, the Apex 080 single stage 10:1 has basically the same overall dimensions as the Anaheim NEMA 34 2-stage 12:1.
• TechnoGear Have hard copy.
• They have an 080 reducer similar to Apex.
• There next one up is smaller than Apex's next one up.
• Consider using a NEMA 34:for a starter. Then consider using the aluminum or titanium mast as the frame for a custom planetary gearing. This should allow the gears to be slight bigger while the overall size of the principal assembly remains unchanged. The use of helical gears should also increase its power capability.
• http://www.andantex.com/sa.html
• http://www.groschopp.com/products/index.php?act=details&num=61001
• NEUGART Servo Gearheads
• Alpha
• Jakob
• http://www.directindustry.com/industrial-manufacturer/planetary-gearbox-68955.html
• http://www.thomasnet.com/catalognavigator.html?cov=NA&what=%22epicyclic+reducer%22&heading=33544008&cid=10046863&CNID=&cnurl=http%3A%2F%2Fhdsi.thomasnet.com%2FCategory%2Fhpg-series-planetary-gearhead
• It looks like a custom (modified 42) will fit in the space. Not any longer!

Where Motor Shaft is Horizontal: 1573

• The primary reduction is a crown and pinion with a 3:1 ratio.
• This is the secondary reduction, the ratio is 3.33:1 between the sun and the planet carrier for a total reduction of 10:1. There is limited or no ability to make adjustments to the total reduction.
• The following specifications have been picked, at this point, solely to get an OA diameter that matches the 10 PD crown gear. See; [Form: RT - Secondary]

• Go with 3 or 4 planets depending on what is required to handle the load.

• Consider large nylon gears and open frame with many planet gears for reliability.

 Working Papers:

Introduction Page | SynchroLite Home Page | Electrotor Home Page | UniCopter Home Page | Nemesis Home Page | AeroVantage Home Page: