Cylindrical linear motors have a simple structure and good performance, but their stator cores are difficult to manufacture. If the mover adopts a multi-faceted cylindrical structure, the stator core can be made by stacking silicon steel sheets in sections, which is much simpler. This section introduces the hexagonal cylindrical mover structure.
Figure 1 shows a core lamination in the stator core, which is made of stamped silicon steel sheets. Several slots are evenly cut on one side of the lamination, which are the places where the stator windings are embedded.
Figure 1. Stator core laminations
Figure 2 shows the entire stator core, which consists of six laminated cores arranged in a circle with their slots facing the axis, forming a cylindrical shape. The lower left corner of Figure 2 is an axial view, clearly showing the arrangement of the entire core.
Figure 2. Stator core composition
The stator coil winding is hexagonal, as shown in the lower left of Figure 3. The stator winding is embedded in the stator slot. Figure 3 shows the four stator windings that have been embedded. To make the structure clear, one core lamination is hidden.
Figure 3 Stator core and windings
The mover of the motor is a hexagonal prism that fits into the inner surface of the stator, leaving an air gap, as shown in Figure 4. The magnetic poles of the mover correspond one-to-one with the teeth of the stator, and permanent magnets are sandwiched between the magnetic poles (the red parts in the figure).
Figure 4. Composition of the motor mover
The permanent magnets are installed using a magnetic focusing method, and the magnetic flux of the permanent magnets is axial. The polarity of each permanent magnet is shown in Figure 5. Adjacent permanent magnets of the same polarity face each other, and the magnetic flux is concentrated at the magnetic poles and flows through the air gap to the stator core. The magnetic lines of force in the figure show the direction of magnetic flux flow, forming an alternating north and south pole magnetic pole structure on the mover.
Figure 5. Magnetic flux flow direction of the motor
Magnetic lines of force surround the coil windings. Each time the mover moves one tooth pitch, the direction of the magnetic lines of force reverses. As the mover moves continuously, the magnetic flux surrounding the coil continuously reverses, inducing an alternating current potential in the windings. The coils are connected end-to-end, leaving two output terminals.
Figure 6 is a cross-sectional view of a six-sided cylindrical permanent magnet linear generator (the base and casing are not shown). Its working principle is the same as that of a cylindrical permanent magnet linear generator. This multi-sided cylindrical linear generator can also be octagonal or tetrahedral.
Figure 6. Cross-sectional view of a six-sided cylindrical permanent magnet linear generator.
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