Technical guide to gear reducers and gearmotors — FAQ
Frequently asked questions about ratio, torque, speed, efficiency and choosing gear reducers and gearmotors.
What do reduction ratio and torque indicate?
The reduction ratio i indicates how many times the motor speed is reduced at the output; the output torque M₂ (Nm) is the twisting effort available at the slow shaft. They are sized according to the load and speed required by the application.
How do I choose the right gearmotor?
You need the output torque M₂ and the output speed n₂ required by the application, plus the service factor based on load type and running hours. Also check the mounting position, shaft type and motor efficiency class (IE3/IE5).
What is the difference between coaxial, parallel-shaft and right-angle gear reducers?
In coaxial units the slow shaft is in line with the motor, with a compact footprint; in parallel-shaft units the shaft is parallel and offset; in right-angle units (bevel-helical) the shaft is at 90°, ideal for corner drives. The choice depends on space, layout and required torque.
How do I find the equivalent of an OEM or competitor code?
Use "Find equivalent" and paste the code: we show the matching catalogue models via the cross-reference tables.
What do the IE efficiency classes mean?
The IE classes (IE3, IE5…) rate the efficiency of the electric motor fitted to the gearmotor: the higher the class, the lower the consumption and running costs. Permanent-magnet IE5 motors are the most efficient.
How do I request a quote?
Add products to your RFQ and submit: no prices online, we reply with a tailored quote. You can also paste a list of codes via "Quick RFQ".