Design Of Elevator Door Control System Based On DSP

In the modern society, electric elevator has been increasingly taking an enormous role in our daily life; meanwhile, much higher requirements for elevator performance are needed. As an important part of the elevator, the elevator door control system cannot be ignored. So far, the existed elevator door control systems still have many problems. Accordingly, the purpose of this paper is to design and develop a motor drive system for elevator door to satisfy requirements of easy control, good drive performance, high torque-to-weight ratio and high real-time processing performance.Compared with other kinds of motors, BLDCM has simpler configuration and easier maintenance and runs more reliably like such AC motors. Also, it can be controlled easily, has good drive performance and runs efficiently without any excitation loss like DC motors but has not any commutator. Based on these characteristics, BLDCM is selected as the drive unit in this paper.Firstly, discussion focuses on configuration of BLDCM, and its running principles as well as necessary existence of torque ripple when current commutes. Then, introduction on BLDCM control strategy based on DSP prepares hardware and software designs for door control system. Next, Matlab/Simulink simulations of BLDCM drive system are presented. In addition, detailed explanation of hardware design goes to main control circuit, user-machine interface circuit, drive circuit, and peripheral interface circuits. Moreover, by means of modulization, this paper concretely describes each module and their design flows such as Auto-study on door-width, user-machine interface, parameter access, motor control and exception handles. Finally, this paper offers experiments and analysis.TI's DSP-TMS320LF2407 is used as the processor of this drive system. It integrates DSP core and abundant peripheral equipments so it can provide ideal solutions for control systems, simplify the process of system design, improve the real-time performance and drive performance of the controller, and improve reliability and integration of the system.Experiments presented in the paper demonstrate that this control system is reliable and steady and satisfies design requirements as well.