# How to calculate the output torque of the reducer

Recently, many customers said that they would not calculate the output torque of the reducer. In fact, it is very simple to calculate the torque. Let me explain it below.

Reducer torque=9550×motor power/motor revolutions×reducer speed ratio×use efficiency The symbol of torque is Nm;

9550 is a fixed number. The motor power is the number of kilowatts (KW) of the motor matched with the reducer. Divided by the number of revolutions of the motor, the minimum number of revolutions of the domestic motor is 1390 revolutions and the largest is 1490 revolutions. When we calculate, we use 1400. If you want to be accurate, you can refer to the motor sample. For example, 0.37KW is 1390 rpm, 3KW is 1420 rpm, 11KW is 1460 rpm, and the unit is r/min; the speed ratio of the reducer is simple and does not explain, the use efficiency It can be calculated in this way, the hard tooth surface gear reducer is almost calculated by 0.9, the good one is calculated by 0.95, but the imported one is generally calculated by 0.95, the efficiency of the reducer with worm gear is poor by 0.65, and the good one is calculated by 0.7.

The above formula describes how to calculate the output torque of the reducer, but when selecting a motor, you need to choose the motor power that matches the bearing torque of the reducer. Different speed ratios should choose motors with different powers. If the power is too large, it will reduce the speed of the reducer. life.