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Frequently Asked

45mm Planetary Gear Motor


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45mm Planetary Gear Motor

Figure 1. 45mm Planetary Gear Motor Pair

The wheelchair uses a pair of 12V 45mm planetary gear motors with a 10mm shaft diameter. These are produced by Twirl Motor in China - Part Number: PG45M775126000-32.5K. When you order this item you get a pair of 2 motors. The motors weight about 2 Lbs each, for a total of 4 Lbs (1.8kgs) for the pair.

Motor Specification (No Gearbox)
No Load Speed6000 RPM
No Load Current 900mA
Full Load Speed4500 RPM
Full Load Current 4A
Torque 750 gf*cm
Stall Torque 3000 (gf*cm)
Stall Current 13A
Gearbox Specification
Gearbox Reduction32.5
Number of gear stages3
Gearbox Length56.2 mm
Max Running Torque20 kgf*cm
Gear Efficiency73%
Motor With Gearbox Specification
No Load Speed135 RPM (=6000/32.5*0.73)
Full Load Speed100 RPM (=4500/32.5*0.73)
Torque17.8kgf*cm (=750*32.5*0.73)

Ordering Info

Part Number Description Price Purchase
GEAR-MOTOR-PAIR Pair of 12V 45mm planetary gear head motors with 10mm shaft diameter $59.95/pair

The Open Wheelchair hardware design is licensed under CERN Open Hardware Licence v1.2 and the Software is licensed under the GNU General Public License Version 3. By viewing or using the design posted on this website you are agreeing to these licenses. To view the license see our license page.

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