Research On Control Strategy Of Permanent Magnet Synchronous Traction Machine For Elevator

At present,the gearless drive permanent magnet synchronous traction machine is applied more and more widely in the elevator industry.Now the permanent magnet synchronous traction machine rotor magnetic steel is usually attached to the rotor.In fact,this structure is difficult to improve the traction machine power density.If the traction machine using the built-in rotor structure uses the magnetoresistance torque produced by the motor salient effect,the use of the permanent magnetic material can be reduced and the material cost of the traction machine can be reduced under the condition that the output torque is reached.In this paper,the driving control system of the inner permanent magnet synchronous traction machine is studied.Considering the load disturbance and the efficient use of the motor,the speed curve design,the load torque observation and the maximum torque current ratio(MTPA)control strategy of the permanent magnet synchronous traction machine are studied.First of all,in order to improve the smoothness and rapidity of the lifting system,this paper mainly studies and compares several operation modes.The traditional algorithm uses the T shape speed curve.The acceleration curve of the algorithm is discontinuous and jumps,and it will cause great impact when running.In view of this,this paper adopts the acceleration and deceleration algorithm of S shape and trigonometric function,and uses the position speed current three closed loop drive system.Experimental research shows that the trigonometric function algorithm is not only flexible and good,but also the algorithm is not only flexible and good,but also the triangle function algorithm is not only flexible and good,but also the algorithm is good,and the algorithm is not only flexible and good,but also the triangle function is not only flexible and good,but also the algorithm is not only flexible and good,but also the triangle function algorithm is not only flexible,but also flexible and good.The algorithm is simple and easy to meet the requirements of high speed.The conversion of the whole moment of inertia of the elevator system is summed up in detail.The moment of inertia is identified by the model reference adaptive method(MRAS),and the load torque is calculated based on the identification value.The load disturbance caused by the change of passenger number can be solved by the model reference.It has achieved remarkable results and verified the effectiveness.Then,in order to make the analytical equation that achieves the maximum torque per ampere(MTPA)unaffected by the motor parameters,this paper sets the variable parameters of rotor flux linkage,direct-axis inductance,and quadrature-axis inductance as the base value of the standard value;Corresponding relational expressions are standardized,resulting in a universal control method applicable to different motor parameters;The first method uses the id and iq relation equations that were originally understood by MTPA to perform the standardization,and the optimal current distribution is obtained by using the formula method;The second method uses the golden section method to obtain the maximum value of the electromagnetic torque,and obtains the corresponding optimal torque angle;The third method uses the dynamic search method to change the step size to search for the optimal id value to achieve MTPA control;Verify the effectiveness and feasibility of MTPA algorithm from three different perspectives;Finally,a 1.5KW internal permanent magnet synchronous motor was used as an experimental prototype;At the same time,the controller hardware was designed and an experimental platform was set up;The experimental verification of the three velocity curve techniques and MTPA control strategies in this paper was carried out;Experiments show that the trigonometric function speed curve can better meet the needs of the rapidity and stability of the elevator operation;Under the same load condition,the reasonable distribution of ID and IQ with MTPA can make good use of the reluctance torque,and the amplitude of phase current is obviously smaller than that of simple id=0 control.