| Abstract |
The design in power electronics and drives requires accurate system behavior prediction. Due to its
increasing complexity, the behavior of subsystems of different physical domains has to be considered
to examine their interactions. Especially the interactions between the electrical, mechanical, and
control systems are of special importance.
With modern three-phase step drives cogging torques exert motion ripples on the mechanical
subsystem and oscillations on the electrical one. Furthermore, the stepper motor can excite the
mechanical train by torque ripples arising from various mechanical and electrical unbalances. The
drive designer has to be provided with appropriate simulation tools to tackle this affect on motion
quality.
This paper first outlines possible simulation strategies. It presents an approach for decomposing a
complex drive into subsystems and modeling them in their major physical domains using concentrated
parameter simulation. There, the cogging torque property of stepper motors is included. The basic
modeling principles of electrical/electronics, mechanical, and control subsystems are shown and
equations derived. A complex step drive example verifying measured results concludes. |
