Specifications N20 Motors Physical Specifications for Pololu N20 High Power Motor Specification Value Type Brushless Output Shaft Style D-shaft Motor Type Brushed DC Output Shaft Support Brass Case Gear Material Metal Gearbox Style Straight Cut Spur Connector Type Male Spade Terminal Weight 9.5g Total Length: 26mm, with shaft 40mm Gearbox Diameter: 12mm x 10mm Shaft Diameter: 3mm Shaft Length: 14mm Mounting Holes (2): M1.6 9mm apart Mounting screw M1.6 Operating Specifications for Pololu N20 High Power Motor Spec Value No-load speed @ 6V: 590 rpm3 No-load current @ 6V: 0.10 A4 Stall current @ 6V: 1.6 A Stall torque @ 6V: 0.86 kg·cm Max output power @ 6V: 1.3 W Extended motor shaft?: Y Motor type: 1.6A stall @ 6V (HP 6V) Performance at Maximum Efficiency Specifications for Pololu N20 High Power Motor Max efficiency @ 6V: 0.38 Speed at max efficiency: 490 rpm Torque at max efficiency: 0.15 kg·cm Current at max efficiency: 0.32 A Output power at max efficiency: 0.75 W Note: Stalling or overloading gearmotors can greatly decrease their lifetimes and even result in immediate damage. The recommended upper limit for instantaneous torque is 2 kg-cm (25 oz-in); we strongly advise keeping applied loads well under this limit. Stalls can also result in rapid (potentially on the order of seconds) thermal damage to the motor windings and brushes, especially for the Pololu N20 High Power Motor; a general recommendation for brushed DC motor operation is 25% or less of the stall current. In general, these kinds of motors can run at voltages above and below their nominal voltages; lower voltages might not be practical, and higher voltages could start negatively affecting the life of the motor. Gearmotor Dimensions In terms of size, these gearmotors are very similar to Sanyo’s popular 12 mm NA4S DC gearmotors, and gearmotors with this form factor are occasionally referred to as N20 motors. Husarion has a great article about calculating your ideal motor size here:
