Pulse frequency inertia characteristics of stepper motor
Stepper motors must have sufficient starting acceleration when starting with inertia loads. Therefore, if the inertia of the load increases, the starting pulse frequency decreases. For this reason, both of them should be considered comprehensively when selecting the stepping motor.
The vertical axis of the figure below shows the maximum self-starting frequency, the horizontal axis is the load inertia, and the curve shows the relationship between the load inertia and the maximum self-starting pulse frequency. Here, a PM type claw pole stepping motor (two phases, step angle 7.5°) is taken as an example. Under the load PL, the relationship between the maximum self-start pulse frequency PL and the load inertia Jc is as follows:
In the formula, JR stepper motor rotor inertia, Ps is the maximum self-starting frequency of no-load.