Motor sizing tool + engineering reference
10:1 Micro Gear Motor
Estimate output speed, torque, and power from a motor operating point. Then check the exact ratio, gearbox limits, and operating conditions before choosing a micro gear motor.
Request Engineering ReviewWhat a 10:1 reduction tells you
The ratio gives a useful first estimate. It does not define the full operating envelope of the motor and gearbox assembly.
First-order relationship; loaded performance must be checked against the selected unit’s data.
Speed falls with the ratio
At an exact 10:1 ratio, the ideal output speed is one tenth of input speed. Loaded speed also depends on the motor curve, voltage, gearbox losses, and applied load.
Torque gain is reduced by losses
The ideal torque multiplication is 10×. Real output torque is lower, and the usable continuous or intermittent limit may be lower still. Use the exact configuration’s ratings.
Nominal ratio is not the full specification
A manufacturer may round a ratio in its product name. Check actual ratio, voltage, loaded speed, torque, duty cycle, and temperature for the part you plan to use.
Evidence example
Published 10:1 motor data is configuration-specific
This Pololu HPCB 12V model is one documented example, not a universal specification for 10:1 micro gear motors. Its product data separates no-load speed, maximum-efficiency operation, and stall extrapolation.
| Published item | Pololu 10:1 HPCB 12V example | How to use it |
|---|---|---|
| Actual ratio | 9.96:1 | Use exact ratio when calculating output speed and torque. |
| No-load speed | 3,400 RPM at 12 V (typical) | This is an unloaded value, not speed at a required load. |
| Maximum-efficiency point | 37% at 2,500 RPM and 0.043 kg·cm | Treat this as a stated operating point, not a continuous torque rating for every application. |
| Stall torque | 0.17 kg·cm (extrapolated) | Do not design for stall; the manufacturer warns stalling can damage the motor or gearbox. |
Source: Pololu product specifications for the 10:1 Micro Metal Gearmotor HPCB 12V. Checked 6 October 2026. Values apply to that product and stated conditions only.
What to verify before selecting a motor
Compare the complete operating point with the manufacturer’s data. A ratio and a stall value alone are not enough to size a drive.
| Check | Request or measure | Decision it supports |
|---|---|---|
| Speed and torque together | Speed–torque curve at the intended voltage | Whether the motor can reach the target loaded output point |
| Gear limits | Continuous and intermittent output torque, input speed, radial and axial load | Whether the gearhead can withstand normal and peak loads |
| Efficiency and heat | Efficiency for the actual ratio and load, duty cycle, ambient temperature | Expected current, heating, and continuous-use margin |
| Power-off behavior | Backdrive or holding data for the motor–gearbox assembly | Whether a brake or separate holding feature is required |
| Integration | Exact ratio, package, shaft, mounting, quantity, and life target | Whether the standard unit fits or an OEM configuration is needed |
Start with the application point
Define required output speed, torque, load profile, duty cycle, voltage, and package limits. Then compare that point with a specific motor and gearbox combination.
Do not use stall as a design target
Stall values are not normal continuous operating limits. Use published gear ratings and motor thermal limits, with margin for starts, reversals, and shock loads.
Two checks that need product data
Efficiency varies with gearhead configuration and operating speed and torque; FAULHABER’s Precision Gearheads technical information describes efficiency at a specific operating point. Also, do not infer power-off holding from the ratio: maxon explains that backdrivability depends on the gear design and the motor/gear combination in its gearhead guidance. Checked 6 October 2026.
Need to evaluate a gearbox without a motor selection? See our 10:1 micro gearbox calculator.
10:1 Micro Gear Motor FAQ
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