Design And Analysis Of U-shaped Permanent Magnet Salient Pole Linear Motor For Vertical Lifting

With the development of modern cities,high-rise buildings continue to emerge,and elevators become an indispensable means of transportation in high-rise buildings.As the driving source of elevator,the traditional three-phase motor faces many challenges in the aspects of lifting height,traffic volume and safety.Therefore,a five-phase U-shaped Permanent Magnet Salient Pole Linear Motor(FU-PMSPLM)is proposed.This motor is a comprehensive multi-phase motor,permanent magnet linear motor and salient pole motor.The integrated new motor has the advantages of high thrust density and high reliability.It is suitable for vertical lifting and it has good application prospects.This paper focuses on the research of the basic structure,electromagnetic characteristics,temperature field,lack of tolerance characteristics and experimental.The main tasks are as follows:1.Structure analysis of five phase U-shaped permanent magnet salient pole linear motor.A new topology of five phase U-shaped permanent magnet salient pole linear motor is proposed,its working principle is explained,and the several different motor design schemes are compared to determine the motor scheme studied.The five-phase motor pole slot matching conditions are given,and the motor windings are analyzed to determine the winding wiring mode.The preliminary structural parameters of the motor are designed,and the main structural parameters of FU-PMSPLM are determined to provide support for subsequent simulation analysis.2.Electromagnetic characteristics analysis and performance comparison of five phase U-shaped permanent magnet salient pole linear motor.The finite element simulation model of a five-phase U-shaped permanent magnet salient linear motor is established.The electromagnetic characteristics of the motor is analyzed.The motor is optimized from two aspects of maximum thrust and minimum permanent magnet consumption.The performances of four kinds of motors are compared and analyzed,which are five-phase U-shaped permanent magnet salient pole linear motor(FU-PMSPLM),five-phase none salient permanent magnet synchronous linear motor(FNS-PMSLM),three-phase U-shaped permanent magnet salient pole linear motor(TU-PMSPLM),three-phase none salient permanent magnet synchronous linear motors(TNS-PMSLM).3.Study on temperature field of five phase U-shaped permanent magnet salient pole linear motor.By analyzing and calculating the heat source,surface heat dissipation coefficient,thermal conductivity and other parameters of the motor,a 3D temperature field calculation model of the five-phase U-shaped permanent magnet salient pole linear motor is established,and the temperature rise of each part of the motor is analyzed.The temperature field of the motor under different loads,the influence of the ambient temperature on the temperature rise of the motor and the change of the temperature field under the demagnetization state are studied.4.Fault tolerance analysis of five phase U-shaped permanent magnet salient pole linear motor.The single-phase open-circuit,adjacent two-phase open-circuit and non adjacent two-phase open-circuit fault of the motor are simulated.The fault-tolerant control strategy of magnetomotive force invariance and the fault-tolerant control strategy of reconstruction magnetic field method are adopted to compensate the fault-tolerant of the phase failure.By adopting the fault-tolerant control strategy of magnetomotive force invariance,it is necessary to increase the current amplitude and change the phase of the residual phase,which can effectively improve the thrust under the fault condition,and it can reduce the thrust fluctuation in the single-phase open-circuit and non-adjacent two-phase open-circuit fault;By adopting the fault-tolerant control strategy of reconstruction magnetic field method,the fault-tolerant control can be realized under the condition of current amplitude invariance It can effectively reduce thrust fluctuations when single-phase open-circuit and non-adjacent two-phase open-circuit fault.Different fault-tolerant control strategies can be adopted according to different application requirements.The comparative analysis also verifies that the designed motor has good fault tolerance.5.Experimental Study.The experimental prototype is made and verified: the no-load back EMF and static thrust of the prototype are tested,the experimental data of the prototype is basically consistent with the finite metadata,and the reasons for the deviation between the experimental data and the finite metadata are analyzed.The correctness of the finite element simulation and the rationality of the motor design are verified by the experiment.Through the research of the motor,it provides a certain reference value for its application in the field of vertical lifting.