Assume that the total output torque of the reducer is T 1, the output speed is N 1, the reduction ratio is 5: 1, and the step angle of the stepping motor is a, then the motor speed is 5*(N 1), and the motor output torque should be (T 1)/5.
5*(N 1)*360/A, so it depends on the moment-frequency characteristic curve: Is the coordinate point [(t1)/5,5 * (n1) * 360/a] below the frequency characteristic curve (initial moment-frequency curve)? If it is lower than the moment-frequency curve, you can choose this motor. If it is above the moment-frequency curve, you can't choose this motor because it will lose step or can't rotate at all.
Supplement: Have you determined the working state and the required maximum speed? If yes, it can be calculated according to the formula provided above. (According to the maximum speed and the load, you can determine whether the stepping motor you choose now is appropriate. If not, you should know what kind of stepping motor to choose. )
In addition, after the stepping motor is started, the frequency can be increased under the condition of constant load, because the stepping motor should actually have two moment-frequency curves. The one you have should be the starting moment-frequency curve, and the other is the out-of-step moment-frequency curve. This curve is shown as follows: when the motor starts at the starting frequency, the load can be increased after starting, but the motor will not lose step; Or start the motor at the starting frequency, and under the condition of constant load, the running speed can be appropriately increased, but the motor will not lose step.