Magnum775 Planetary GearmotorThe Robot Power Magnum775 is a robust low-cost gearmotor which includes a 20:1 reduction ratio planetary gearbox and a powerful RS775 motor. The gearbox output shaft is 0.5" diameter and 3" long with a precut keyway for easy mounting of wheels and sprockets. Specifications: Size: 1.75" square flange x 4.92" long (excluding shaft) Weight: 28oz motor and gearbox Motor: Leshi LS-775PX (Mabuchi RS-775 copy) Motor voltage: 14.4V nominal, may be run at 18V Gear Ratio: 20:1 2-stage planetary Output Shaft: 0.50" dia. x 3.0" long with standard 1/8" keyway Gears: machined steel Output Bearings: dual ball bearingsPerformance with stock motor Peak Output Power: 400W at 14.4V (650W at 18V) motor spec Gearbox output Speed: 720 RPM at 14.4V (KV = 50 RPM/V) Gearbox torque (estimated): Kt = .12Nm/A - 17.0oz-in/A at peak power out 14.4V Gearbox stall torque(theoretical): 17.6Nm - 2500 oz-in Motor current: 3.9-4.9A no load at 14.4V Stall current: 130A at 14.4V (motor mfr spec) Motor Stall torque: 0.980Nm - 139 oz-in at 14.4V Peak Efficiency: ~75% peak for motor (mfr spec) not including gearbox Drawings etc. Magnum775 Drawing Solid models (by Team Rolling Thunder) Solidworks, IGES, STEP Motor Datasheet Additional InformationAdditional Images Magnum775 Metal GearsMagnum775 Ring Gear and Mounting Details
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