Control System Of Elevator Door With Open- Winding Permanent Magnet Synchronous Motor Based On STM32

The control system of elevator door occupies an important position in the entire elevator system for the safe operation of elevator system.Therefore,the problems caused by the failure of the elevator door system make it especially important to do the research on its optimization and maintenance technology.Based on the comparision between open permanent-magnet synchronous motor(OW-PMSM)and the traditional PMSM and the theory of voltage vector(SVPWM)control technology,the paper studied the dual-inverter control system for openwinding motors with common DC bus from the aspects of theoretical analysis,mathematical model,simulation analysis and experiment verification,including simulating and experimenting the methods for the suppression of zero-sequence current and dual inverter faulttolerant operation.The specific work is listed as follows:Firstly,the research background and development status of open-end permanent magnet synchronous motor was reviewed.And its several common control strategies and fault-tolerant control methods were analyzed.In addition,based on the analysis of OW-PMSM topology and the power supply principle of common DC bus,the mathematical model of OW-PMSM is established in three coordinate systems.Secondly,based on the SVPWM control technology for traditional PMSM,the paper proposed the method of controlling the dual-inverter control system for OW-PMSM in the maximum voltage vector range to improve the voltage utilization ratio.Because the dualinverter control system with common DC bus exists zero-sequence reflow,and the zerosequence current caused by common-mode voltage affects the normal operation of the motor.This article proposes two control schemes,which are improving the coefficient of zero vector time and increasing closed-loop of zero-sequence current.And the zero-sequence current is well suppressed and the harmonic components of the three-phase current are reduced.What’s more,based on the analysis of the fault-tolerant control of the drive system for open-winding motor in non-redundant operation mode,the scheme of two-phase fault-tolerant operation is presented.Finally,on the basis of the above work,the simulation model of OW-PMSM is built,and a dual-inverter control system for open-winding motors with common DC bus is built based on this model.The simulation comparison between the traditional SVPWM control system and the improved SVPWM control system with suppression of zero-sequence current is carried out.At the same time,the simulation model of the control system with the control strategy of twophase fault-tolerant operation after the system failure is established,and the correctness and effectiveness of the strategies above are verified.The control system is tested on the hardware platform with the control chip of STM32F407.The results verified the feasibility of the engineering application of the method of dynamic suppression of zero-sequence current.