Stator coreless permanent magnet linear motor for electromagnetic boosting

Abstract

The invention discloses a stator coreless permanent magnet linear motor for electromagnetic boosting. The stator coreless permanent magnet linear motor comprises a stator and a mover, the stator has acoreless structure, and the stator is symmetrically placed at the outer side of the mover. Through improvement of the arrangement mode of the stator structure and a permanent magnet in the mover, theaction of winding magnetic fields at two sides is enhanced, and the stator coreless permanent magnet linear motor has a two-way magnetic gathering capability so as to improve the linear motor gap flux density, increase the motor thrust density and improve the output electromagnetic force. The stator coreless permanent magnet linear motor for electromagnetic boosting is simple in structure, high in motor efficiency and low in electromagnetic noise, can perform short-time output of the enough large electromagnetic force for electromagnetic boosting and has low weight.

Description

technical field [0001] The invention relates to a linear motor, in particular to a stator coreless permanent magnet linear motor for electromagnetic boosting. Background technique [0002] At present, in recent years, electromagnetic boosting has been greatly developed and widely concerned in the boosting of aircraft, spacecraft and missiles, and is an important technology for the current and future development of the military field. Compared with traditional steam boosting, electromagnetic boosting technology has excellent controllability and stability. [0003] As the main provider of the thrust of the electromagnetic booster system, the linear motor plays an extremely important role in this field. At present, the motor types of linear motors are mainly composed of induction linear motors, permanent magnet flux switching linear motors and permanent magnet linear synchronous motors. Among them, induction linear motors have simple structure, light mover weight, short decele...

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Problems solved by technology

At present, the motor types of linear motors are mainly composed of induction linear motors, permanent magnet flux switching linear motors and permanent magnet linear synchronous motors. Among them, induction linear motors have simple structure, light mover weight, short deceleration distance, no permanent magnets, Due to the advantages of simple secondary structure and low cost, scholars at home and abroad have conducted detailed research on the electromagnetic characteristics, optimal design, and control strategy of the motor model of the induction linear motor, especially the bilateral long primary induction motor has always been the mainstay of the electromagnetic booster system The main research object, but the thrust density, efficiency and power density of induction linear motors are low

The mover of permanent magnet flux switching linear motor has simple structure, solid and durable, wide speed range, small risk of demagnetization, convenient cooling, and fault tolerance. The permanent magnet flux switching motor has large permanent magnet flux leakage, low power density, large thrust fluctuation, complex manufacturing process and high quality of the mover core; permanent magnet linear motor has the advantages of high power density, high efficiency and high power factor. , mainly divided into moving coil type and moving magnet type: moving coil type moving parts need to be energized, unsafe, unreliable, and heavy moving parts, moving magnet type moving parts have no armature winding, simple and reliable structural parts, and light weight moving parts , but the volume weight and loss of the iron core of the permanent magnet linear motor are large, the heat generation is obvious, the risk of permanent magnet demagnetization is high, the cogging torque and noise are large, and the iron core is easy to saturate, the motor overload capacity is limited

[0004] In the process of electromagnetic boosting, the running time of the motor is short, and the instantaneous output is large. The thrust density of the induction linear motor and the permanent magnet flux switching linear motor is relatively low, and the volume and weight required to output the same magnitude of thrust are larger. The traditional iron core Although the thrust density of permanent magnet linear motor is high, its iron core is easy to saturate, its overload capacity is limited, and it also requires a large volume and weight

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