Low-cost Motor Hardware-in-the-loop Real-time Simulation Platform Design

With the rapid development of computer software and hardware technology,computer simulation technology has gradually exerted its tremendous advantages in the engineering field.Traditional experimental methods have been unable to meet the scientific research and teaching needs of experimental personnel.The large equipment,high storage space requirements,many extreme experiments that cannot be performed,and operational safety hazards are becoming increasingly prominent.Especially the high costs make many university research institutes unable to afford a large number of these devices.Therefore,people began to use computer simulation technology to virtualize the experiment and achieve the same research results at the lowest possible cost.At present,the simulation method has undergone three generations of updates and entered the phase of semi-physical simulation.This method is between pure physics simulation and pure digital simulation.It includes both virtual models and physical devices,and at the same time absorbs the advantages of both and complements each other.The respective shortcomings,with real-time,reliability and accuracy.Because of these advantages,semi-physical simulation has gradually become a mainstream trend in college teaching.Based on the concept of hardware-in-the-loop simulation,this paper designs a hardware-in-the-loop real-time simulation platform for asynchronous motors using embedded development technology,and uses this platform to build a complete virtual simulation laboratory.The real-time simulation platform consists of three parts:embedded core board,PLC controller and PC upper computer.The classical model of Park transformation is used to build the motor model,and the core part of the simulation is implemented in the embedded core board to complete the operation of the motor model.With PLC as a means to add physical equipment,the simulated results are transmitted to the PLC controller in real time through AD conversion.After the PLC controller receives the signal,the signal is processed according to the control algorithm,and the feedback command is issued to control the virtual motor.The step length reaches 200us,approaching the real working condition,the simulation result is compared with Matlab,the two are consistent.The upper computer developed by MFC is an interface-friendly human-computer interaction system.It can not only demonstrate the experiment of the motor,but also control the experiment process by setting itself.In the upper computer interface,the experiment is divided into offline and online two parts,that is to meet the online real-time simulation,but also to meet the offline teaching demonstration.The simulation experiment shows that the simulation system is accurate and reliable,and the hardware-in-the-loop real-time simulation accuracy is achieved.Under the premise of satisfying real-time and accuracy,it has saved teaching expenses to the maximum extent and shortened the cost of learning time,which reflects the feasibility and superiority of the hardware-in-the-loop simulation platform in teaching.