Core Calculation Steps

Accurate reducer selection starts with a clear understanding of load conditions, duty cycle, and the required output torque under realistic operating scenarios.

1. Pre-Selection Preparations

Collect motor power, input speed, required output speed, mounting orientation, ambient temperature, and any shock or reversing loads before comparing reducer families.

2. Calculate Load Torque

Convert the application load into equivalent torque at the reducer output shaft, including inertia effects for start-stop or indexing applications.

3. Determine Service Factor

Apply the correct service factor based on daily operating hours and load severity to avoid undersizing the transmission system.

Load Type Service Factor Example
Uniform load, 8h/day 1.00 – 1.25 Fans, light conveyors
Moderate shock, 8–16h/day 1.25 – 1.50 Mixers, machine tools
Heavy shock, 16–24h/day 1.50 – 2.00 Crushers, rolling mills

4. Gear Ratio and Output Speed

Match the target output speed and verify that the selected ratio keeps the motor within its efficient operating range.

5. Check Thermal Power Rating

Confirm the reducer thermal rating under continuous duty, especially in enclosed spaces or high ambient temperatures.

Practical Selection Tips

When in doubt, prioritize verified duty data, documented service factors, and factory-supported sizing for mission-critical applications.