The combination of both modelling approaches results in a highly flexible modelling system. For example, the modelling of control parts can be carried out to a lower level of detail in a digital model, while motors, power electronics, mechanical parts and other components are described in more detail by algebraic and differential equations in an analogue model. The picture above demonstrates the capabilities of VHDL-AMS in the example of a stepper motor drive. The system simulation consists of a number of component models, all of them written in VHDL-AMS. The motor is controlled by an inverter made of two H-bridges. PWM signals for switching the transistors on and off are generated by digital processes. The models of the inverter (electrical), motor phases (electrical/mechanical) and rotor (mechanical) use analogue statements only. This simulation model has been created by Adapted Solutions in the frame of a project run by the FAT working group Simulation of mixed-signal systems with VHDL-AMS.
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