How to calculate the ratio of Speed Reducers?

Formula: i = n1 ÷ n2

Note: i – Ratio, n1 – Input Speed(r/min), n2 – Output Speed(r/min)

How to calculate the torque of speed reducers?

Formula: T = 9550 × P ÷ ( n1 ÷ i ) × fs

Note: T – Torque, P – Motor Power, fs – Safety Factor, fs > 1