Applied Research On Sensorless Vector Control Of PMLSM In Vertical Lift System

Linear synchronous motor have much advantage, such as long distance, low inertia, high precision, rapid response and high speed etc., because it can directly drive equipment dispense with drive mechanism and clear up the limit of the speed and acceleration physics ultimate of mechanism.Vertical lift system drived by permanent magnet linear synchronous motor (PMLSM) is a new type cordless elevator. This cordless elevator is widely used in the field of elevator for tall buildings and lift system for pit. Traditional lift system will have a great change if these problems are solved, and the theoretical value and the social benefits are immeasurable. Permanent magnet linear synchronous motor as the hard core of new type cordless elevator has many benefits, such as super-efficient, saving energy, doing linear movement and simple structure, convenience control, no pollution and low yawp. So far, permanent magnet linear synchronous motor as a primary drive source is one of the best subjects in this field.In conventional motion controls, optical encoders are used to detect the position and velocity signals of PMLSM. However these additional sensors increase the cost of system and decrease the reliability, all this restrict the applied range of PMLSM. With this background, the elimination of position and velocity sensors has been an attractive prospect.Sensorless vector control system is researched in this paper, the main tasks are as follows.Firstly, mathematical models in different coordinate system of PMLSM are set up based on electromagnetism in this paper, and the paper studies the conversion between them. Based on these models, the vector control method theories are discussed.Secondly, the paper discusses the rotor position self-sensing method in detail, constructs Motor's velocity Model Reference Adaptive System (MRAS) distinguish method using the model of PMLSM and stator's electric current equation, and designs vector control system based on MRAS method. The effect on linear motor is studied owing to margin end effect created by iron core break off and the way of vector control is putted forward considering dynamic portrait margin end effect.Thirdly, the detailed simulation research of sensorless vector control system based on MARS is did using Matlab/Simulink. The results indicated the model's distinguish precision and dynamic performance are satisfied.Fourthly, the principle and the realization method of SVPWM are introduced in detail.Finally, the control system software is designed based on sensorless vector control system hardware with digital signal process TMS320LF2407A as core.