What does stepper motor reduction ratio mean?

Feb 27, 2026

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The stepper motor reduction ratio describes the relationship between the input and output speeds in a speed reducer, representing the degree of change in the motor's output torque or speed after passing through the speed reducer. Here is a detailed explanation of stepper motor reduction ratios:

Definition and Function:

The reduction ratio is represented by the symbol "i," reflecting the effect of the speed reducer on the motor's speed and torque.

Through a speed reducer, the motor's output torque can be increased, while the speed decreases.

Expression:

The reduction ratio is generally expressed by connecting the input and output speeds with a colon ":," such as 60:1.

Alternatively, the actual input and output speed values ​​can be provided, such as 1500 r/min to 25 r/min, to represent the reduction ratio.

Simplified Representation:

For certain special types of speed reducers, such as cycloidal speed reducers or harmonic speed reducers, the reduction ratio may be rounded for easier understanding.

Practical Applications:

In practical applications, by selecting an appropriate reduction ratio, different output torque and speed requirements can be met.

For example, in applications requiring higher output torque and lower speed, a larger reduction ratio can be selected.

In summary, the stepper motor reduction ratio is a key parameter describing the performance of the reduction gear, and it has a significant impact on the motor's output torque and speed.

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