# What is the deceleration ratio? How to calculate the reduction ratio of the reduction motor?

Update:28 Mar 2020

The reduction ratio is output speed by engagement of large and small gears, and multi-stage gear engagement, with lower reduction ratio and greater torque.
The reduction ratio is generally understood. For example, the reduction ratio of 1:100 is the motor (motor) speed of 100 RPM (revolution), and the output spindle of 1 RPM (revolution).
Calculation formula of reduction ratio: reduction ratio = input speed ÷ output speed.
1. The reduction ratio, that is, the transmission ratio of the reduction device, is a kind of transmission ratio, which refers to the ratio of the instantaneous input speed to the output speed in the reduction mechanism. The symbol "I" indicates the reduction ratio: for example, the reduction ratio is 1 / 64; if the stepping motor outputs 1 N.m torque, the output torque converted by the reduction gearbox is 64n. M, of course, the speed is reduced to 1 / 64 of the original speed.
2. Generally, the expression method of deceleration ratio is to take 1 as denominator and use the ratio of input speed and output speed connected by ":". For example, if the input speed is 1500r / min and the output speed is 25R / min, the deceleration ratio is: I = 60:1. Generally, the gear reduction ratio of the reduction mechanism is marked with the actual gear reduction ratio. However, some special gear reducers, such as cycloid gear reducers or harmonic gear reducers, are sometimes rounded by the rounding method without denominator. For example, the actual gear reduction ratio may be 28.13, while the General mark is 28.

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