Abstract
As both magnets and coils are arranged in the motor primary, a short primary long secondary flux switching permanent magnet linear motor (FSPMLM) is favorable to construct a feed system, especially for long distance, multi-axis applications. A novel FSPMLM with a complementary primary module and end-PM topology is proposed to directly drive a biaxial feed system, and the whole structure is presented. To consider the influence of temperature raise on motor performance, magnetic-thermal coupling finite element analysis is employed, and then, the motor dimensions are optimized by the response surface method. With the same 500 N rated force and 1.5 m/s rated speed of the two FSPMLMs, the biaxial prototype is fabricated. Considering the two-axis synchronization, the control system is constructed by using a commercial motion controller and servo drivers. Monoaxial and biaxial feeding experiments are carried out simultaneously. Both X and Y axes exhibit sufficient force capability for well dynamic response, and the positioning error is less than 0.14 mm. Biaxial diamond and circular trajectories are conducted, and the contour errors are less than 0.88 mm. It can be seen that the proposed FSPMLM feed system is featured with favorable performance and competitiveness for applying in various industrial applications.
Highlights
A direct drive permanent magnet linear motor (PMLM) eliminates the cost and complexity of a mechanical transmission and is very attractive in applications such as computerized numerical control (CNC) machines, 3D printers, and other precision equipment
Both the primary cores of the X-axis and Y-axis flux switching permanent magnet linear motor (FSPMLM) are laminated by silicon steel sheets, and the material designation is 50W600
The secondary core of the X-FSPMLM is a silicon steel sheet, and for the long distance, it is divided into three equal sheets to laminate
Summary
A direct drive permanent magnet linear motor (PMLM) eliminates the cost and complexity of a mechanical transmission and is very attractive in applications such as computerized numerical control (CNC) machines, 3D printers, and other precision equipment. References and researched the hybrid excitation FSPMLM for adjustable air gap magnetic field Such complicated topologies will be expensive to manufacture. With attention to manufacturability and force performance, a novel FSPMLM with a complementary primary module and end-PM is presented, and the mechanical structure of the biaxial feed system is designed. In both the X-axis and Y-axis, the primary core is arranged on the moving table, and the secondary core is fixed on the frame base. The rated force is set to 500 N, the rated speed is set to 1.5 m/s, and the maximum feeding distance is set to 500 mm
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