How to Choose a Miniature Gear Motor for a Smart Lock?

Selecting a miniature gear motor for a smart lock cannot be based solely on size, rated voltage, or reduction ratio. A more reliable method is to define the actual load of the lock body, target action time, power supply conditions, lifespan requirements, noise limits, and installation space as testable conditions, and then verify them using an installed sample.

## Why Same Size Doesn't Equal Applicability

The appearance only indicates whether it can fit into the structure; it doesn't indicate the motor's performance under low power, tight mechanism, forward/reverse switching, or long-term operation. Even if two lock bodies look similar, their load curves, transmission efficiency, and control strategies may differ.

## At Least Six Questions to Answer During Selection

1. What load can the motor withstand under no-load, normal, and heavy-duty conditions?

2. How long is allowed for a single action, and what is the corresponding output speed?

3. What torque is required during startup and operation, and what are the test conditions?

4. What are the daily number of actions, single power-on duration, and forward/reverse frequency?

5. At what distance, background, and installation condition should noise be evaluated?

6. What are the limitations on the gearbox profile, output shaft, mounting method, leads, and terminals?

## Two Misconceptions about Reduction Ratio and Gear Material

A higher reduction ratio is not always better. It changes both output speed and torque, and efficiency, operating rhythm, and space requirements must also be considered. Gear material cannot be judged by color or appearance; common materials may include POM, metal gears, and powder metallurgy gears, and must be considered in conjunction with the BOM and design scheme.

## How to Conduct Sample Verification

It is recommended to first freeze the voltage range, load curve, operating time, control logic, and dimensional boundaries; then match samples; after installing a real lock body, test start-up, forward and reverse rotation, operating time, current, torque, noise, and temperature rise; conduct life tests according to product requirements; finally, finalize the design based on the technical specifications and acceptance standards.