China Supplier Gearbox Nmrv



NMRV series worm-gear reductors are important transmission machineries. They are fit for various mounting positions and with the features of light-weight, compactibility and flexibility, they fulfill the demands of customers very well. As the advanced solutions, they are widely used in many fields: food staff, chemical and industrial industry, textile industry, electronic equipments, conveyors equipments, cranes, metallurgy, printing and dying etcGet more news about Nmrv Supply Chain,you can vist our website!

For correctly selecting a gear reducer or geared motor, several essential pieces of data are required:
1. The rotational input speed to the gear reducer (n1) and the rotational output speed (n2). Through these two values it is possible to calculate the reduction ratio (i) of the gear reducer using the following formula: i=n1/n2
2. The torque required by the application (Mr2). The geared motor or gear reducer can be selected once this data is known.This guide helps you to select the right product in just a few steps:
Geared motor selection
1. Determine the application’s actual service factor (s.f.). This parameter depends on the type of load of the powered machine, the number of starts per hour and the hours of operation (refer to the "Service factor" paragraph).

2. Calculate the input power Pr1 using the required torque value Mr2, the speed n2 and dynamic efficiency value.

Pr1=(Mr2*n2)/(9550*ηd). The dynamic efficiency value depends on the type of gear reducer and on the number of gear reduction stages. (To calculate the efficiency value see its page).

3. Consult the geared motor performance tables and identify a normalised power value Pn1 exceeding the required power Pr1, such that: Pn1≥Pr1
4. Once the suitable nominal power has been identified, select the geared motor capable of generating the rotational speed closest to the desired n2 value and with service factor s.f. greater or equal to that required by the application.