Design Optimization And Research Of Permanent Magnet Synchronous Motor For Vertical Movement

Permanent magnetic linear synchronous motor(PMLSM) is a new structure for vertical hoisting movement, compared with the traditional hoisting structure, it has many advantages in multiple aspects such as unrestricted lift height, higher space utilization, better safety factor and so on. However, the end effect and cogging effect due to the special structure of linear motor will cause the motor thrust ripple, control accuracy decreased and many other issues, therefore the study on these issues of the linear synchronous motor is particularly important.In this paper, the impact on 16 different slot-pole combinations of PMLSMs with fractional slot concentrated windings on main performance is set as core issues of permanent magnet linear synchronous motor for vertical movement,main parameters of the motor is calculated through analytical analysis. On the basis of the design of the prototype motor,main performance with 16 different slot-pole combinations were optimized, and the detent force, winding layout and winding factors is deeply studied. Through the establishment of the finite element method(FEM), the influence of magnetic field, back electromotive force(EMF), the average thrust, thrust ripple and loss performance with different slot-pole combinations is calculated. By choosing the proper slot-pole combination, the thrust ripple and detent force could be reduced while the thrust is still maintaining the same level. The motor loss calculation model is established for PMLSM, and the influence on the motor loss with different slot-pole combinations is analyzed. On this basis, the detent force of 8-pole 9-slot PMLSM prototype were optimized by adding additional teeth, thereby reducing the end force to lower end portions of the detent force. Then a detailed comparative analysis of the electrical field, average thrust, detent force thrust ripple and motor loss is researched after installing additional tooth. Optimization result of different slot-pole combinations and additional tooth is verified By FEM, therefore provides a theoretical basis for further design optimization..