Abstract
In order to eliminate the frictional resistance of CNC machine feed platform and improve the machining accuracy and surface roughness, the hidden - pole magnetic suspension linear synchronous motor used to drive the CNC machine tool feed platform was studied. According to the special structure and operation mechanism of the hidden - pole magnetic suspension linear motor, the mathematical model of the electromagnetic force of the motor was established firstly. Then the finite element calculation for the air gap magnetic density, back electromotive force and electromagnetic force of two different structures of the motor of the salient pole and hidden pole was carried out by Finite element software, and the harmonic analysis for air gap magnetic density was done. By comparing the electromagnetic forces of the two motors, it is found that the hidden pole has less fluctuation of the electromagnetic force, so it is more suitable for feed platform as a driving component. Finally, Particle swarm optimization is used to optimize the electromagnetic force of the hidden-pole controlled-magnet linear magnetic suspension synchronous motor, which further reduces the fluctuation of the electromagnetic force, and also improves the efficiency of the motor. The results of the experimental prove the effectiveness of the control method.
Highlights
With the rapid development of modern manufacturing technology, the linear motor direct drive system with high speed and high precision has gradually replaced the traditional ball screw and rotary motor transmission method in CNC machine tools
The feed platform proposed in this paper is a new type of CNC machine tool feeding platform, whose suspension force and thrust are provided by the same hidden-pole magnetic suspension linear motor (HPMSLM); The magnetic field of the synchronous motor can be automatically adjusted according to the suspension height, which realizes direct magnetic suspension and direct feed, the numerical control machine tool realizes frictionless feed at the same time of direct drive, which is of great significance for improving the performance of the CNC machine feed platform
EXPERIMENTAL RESULTS OF MAGNETIC SUSPENSION LINEAR MOTOR The suspension linear motor and its control system are shown in the figure10
Summary
With the rapid development of modern manufacturing technology, the linear motor direct drive system with high speed and high precision has gradually replaced the traditional ball screw and rotary motor transmission method in CNC machine tools. How to reduce the fluctuation of the electromagnetic force of the motor has caused widespread concern In response to this problem, many scholars have conducted in-depth research on the structure of the magnetic suspension feed platform and the optimal design of the motor used for the platform. In [17]–[20], different optimization algorithms are used to optimize the design of synchronous linear motors, and the electromagnetic force fluctuations are improved by optimization to reduce friction and make the stability better. The feed platform proposed in this paper is a new type of CNC machine tool feeding platform, whose suspension force and thrust are provided by the same HPMSLM; The magnetic field of the synchronous motor can be automatically adjusted according to the suspension height, which realizes direct magnetic suspension and direct feed, the numerical control machine tool realizes frictionless feed at the same time of direct drive, which is of great significance for improving the performance of the CNC machine feed platform. Using the particle swarm algorithm to optimize the electromagnetic force of the motor, which further reduces the fluctuation of the electromagnetic force
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