A folded winding suitable for slotless motors

Abstract

This invention discloses a folded winding suitable for a slotless motor, relating to the field of slotless motor technology. It includes a folded structure and connecting wires. The folded structure is cylindrical. It is formed by arranging and connecting several rectangular modules according to a predetermined pattern, then folding them according to a predetermined folding pattern, and finally winding them into a cylindrical shape. The predetermined arrangement is such that the side lengths of the rectangular modules gradually increase along the direction of their arrangement, resulting in a stepped shape when the folded structure is laid flat. The predetermined folding pattern is such that the folding directions of adjacent folding positions are opposite. The folding positions are the contact points of adjacent rectangular modules. The connecting wires are arranged between adjacent rectangular modules to form the wiring of the folded structure. This invention ensures both neat wiring arrangement and ease of manufacturing.

Description

Technical Field

[0001] This invention relates to the field of slotless motor technology, and in particular to a folded winding suitable for slotless motors. Background Technology

[0002] Gearless motors, due to their advantages such as small size, light weight, high power density, and low torque ripple, have gradually become an important branch of motor development. Gearless motors are already widely used in aerospace, drones, robotic arms, bionic robots, and many other fields. However, the winding device of a gearless motor must ensure that all conductors are neatly arranged and that the spacing between adjacent conductors is consistent. This makes the manufacturing process of the gearless motor winding device complex and difficult to process. Therefore, a winding method is needed that can ensure neat wiring arrangement while being easy to manufacture. Summary of the Invention

[0003] The purpose of this invention is to provide a folded winding suitable for slotless motors, which can ensure neat wiring arrangement and is easy to process.

[0004] To achieve the above objectives, the present invention provides the following solution:

[0005] A folded winding suitable for a slotless motor includes a folded structure and connecting wires;

[0006] The folding structure is cylindrical in shape. It is formed by arranging and connecting several rectangular modules according to a predetermined pattern, then folding them according to a predetermined folding method, and finally rolling them into a cylindrical shape. The predetermined pattern is such that the side lengths of the rectangular modules gradually increase along the direction of their arrangement, resulting in a stepped shape when the folding structure is laid flat. The predetermined folding method is such that the folding directions of adjacent folding positions are opposite. The folding position is the contact point between adjacent rectangular modules.

[0007] The connecting lines are arranged between adjacent rectangular modules to form the wiring of the folded structure.

[0008] Optionally, the rectangular modules have different lengths parallel to the crease direction, but the same length perpendicular to the crease direction.

[0009] Optionally, the outermost ring of the folded structure is a rectangular module with the longest length parallel to the fold line direction, and the innermost ring of the folded structure is a rectangular module with the shortest length parallel to the fold line direction.

[0010] Optionally, the folded winding has a multi-layer structure, and each layer has a connecting wire.

[0011] Optionally, the rectangular module has through holes, and the connecting lines on each layer of the rectangular module are connected in series or in parallel through the through holes.

[0012] Optionally, the connecting line includes a middle connecting line and end connecting lines; the middle connecting line is the connecting line at the point where the folded structure overlaps with the motor rotor along the motor axis; the end connecting lines are the connecting lines of the rectangular module at both ends, perpendicular to the fold line direction.

[0013] Optionally, the central connecting wire is used to connect current to form an armature magnetic field.

[0014] Optionally, the end connecting line is used to connect and conduct the middle connecting lines belonging to the same phase on each of the rectangular modules.

[0015] Optionally, the ends of the connecting wire are provided with solder pads.

[0016] Optionally, the foldable structure is made of a flexible printed circuit board.

[0017] According to specific embodiments provided by the present invention, the present invention discloses the following technical effects:

[0018] This invention provides a folded winding suitable for slotless motors. A cylindrical folded winding is obtained by folding and winding a flat FPC (Flexible Printed Circuit) in a specific manner. This folded winding is not only easy to install and remove on slotless motors, but also avoids the processing difficulties and uneven winding arrangement problems of traditional slotless motor winding devices. It also effectively reduces the weight and volume of the winding, thereby increasing the power density of the motor. Attached Figure Description

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 This is a planar unfolded schematic diagram of the folded winding of the present invention applicable to a slotless motor;

[0021] Figure 2 This is a schematic diagram of the folded winding of the present invention after it has been folded.

[0022] Figure 3 This is a schematic diagram of the folded winding of the present invention after folding and winding.

[0023] Symbol explanation: 1-1 Rectangular module; 1-2 Folding position; 2-1—Middle connection line; 2-2—End connection line; 2-3—Through hole; 2-4—Pad. Detailed Implementation

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] The purpose of this invention is to provide a folded winding suitable for slotless motors, which effectively ensures neat winding arrangement and symmetry of each phase winding, reduces the difficulty of winding processing, and decreases the weight of the slotless motor (or coreless motor). The folded winding for slotless motors provided by this invention is suitable for any field requiring motors with low torque ripple.

[0026] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] This embodiment provides a folded winding suitable for a slotless motor, including: a folded structure and connecting wires.

[0028] The foldable structure is cylindrical in shape; it is made of a flexible printed circuit board; it is formed by arranging and connecting several rectangular modules according to a predetermined pattern, then folding them according to a predetermined pattern, and finally rolling them into a cylindrical shape; the predetermined pattern is such that the side lengths of the rectangular modules gradually increase along the direction of their arrangement, resulting in a stepped shape when the foldable structure is laid flat; the predetermined folding pattern is such that the folding directions of adjacent folding positions are opposite; the folding positions are the contact points of adjacent rectangular modules; the connecting lines are arranged between adjacent rectangular modules to form the wiring of the foldable structure. In this embodiment, each rectangular module is an integral structure, meaning that adjacent rectangular modules are connected without interruption, and these rectangular modules are formed on a flexible printed circuit board after a special process.

[0029] The rectangular modules have different lengths parallel to the crease direction, but the same length perpendicular to the crease direction. Several of these rectangular modules are different parts of the entire folding structure, interconnected to form a whole. The outermost ring of the folding structure consists of the rectangular modules with the longest length parallel to the crease direction, and the innermost ring consists of the rectangular modules with the shortest length parallel to the crease direction.

[0030] The folded winding has a multi-layer structure, and each layer has a connecting line; each rectangular module has a through hole, and the connecting lines on each layer of the rectangular module are connected in series or in parallel through the through hole.

[0031] The connecting lines include a central connecting line and end connecting lines; the central connecting line is the connecting line along the motor axis at the point where the folded structure overlaps with the motor rotor; the end connecting lines are the connecting lines at both ends of the rectangular modules perpendicular to the fold direction. The central connecting line is used to conduct current to form an armature magnetic field. The end connecting lines are used to connect and conduct the central connecting lines belonging to the same phase on each of the rectangular modules.

[0032] The end of the connecting line is provided with a solder pad for welding; the solder pad connects the branches of the winding belonging to the same phase in series or in parallel by welding; the folded winding can also be connected to the drive control circuit of the motor by welding the lead wire; or the phases can be connected in a star shape by welding the lead wire.

[0033] Figure 1 This is a structural diagram of the folded winding of the present invention in a flat state. Figure 1 As shown, the folded winding exhibits a stepped structure in its flat state. In this flat state, the folded winding of the present invention has multiple rectangular modules 1-1 of different sizes. In its unfolded (flat) state, the folded winding of the present invention is marked with folding positions 1-2, and the folding directions of adjacent folding positions are opposite. If the folding direction of a certain folding position is upward and the folding angle is 360 degrees, then the folding direction of its adjacent folding position is downward and the folding angle is -360 degrees. After folding, the rectangular modules 1-1 overlap. From the top layer to the bottom layer, the length of each rectangular module 1-1 perpendicular to the fold line is the same, and the length parallel to the fold line increases progressively.

[0034] Figure 2 This is a schematic diagram showing the folded winding of the present invention after it has been fully folded. Figure 2 As shown, each rectangular module 1-1 of the folded winding is provided with a central connecting line 2-1 and an end connecting line 2-2. The electrical central connecting line 2-1 and end connecting line 2-2 of each layer are connected in series or in parallel through through holes 2-3. Among them, the pads are labeled 2-4.

[0035] Figure 3 This is a schematic diagram of the folded winding of the present invention after folding and winding. Figure 3 As shown, the folding structure is folded sequentially along adjacent positions of the rectangular modules 1-1, with the folded modules overlapping. The longest rectangular module 1-1 parallel to the fold line is then used as the outermost ring after winding, and the shortest rectangular module 1-1 is used as the innermost ring. After winding, the radial positions of each rectangular module 1-1 are different, and each module forms a complete circle. Winding according to this pattern ensures the overall roundness of the wound rectangular modules 1-1 and the spatial symmetry of the winding phases.

[0036] This invention provides a folded winding suitable for coggingless motors, avoiding the difficult processing of coreless motor windings and ensuring the neatness and symmetry of each phase winding. The folded winding is constructed by repeatedly folding a multi-layered wired FPC (flexible printed circuit board), then winding it into a cylindrical shape, and finally shaping it. Pads are provided at the ends of the winding assembly for soldering connections to other modules. Because the wiring on the FPC can be arranged very neatly and the processing technology is mature, using it as a coreless motor winding ensures the symmetry of each phase winding and effectively reduces the difficulty of winding processing. The folded winding provided by this invention is cylindrical, easy to install and remove, and highly flexible; moreover, the FPC is very lightweight, effectively reducing the weight of the motor when used as a coreless motor winding assembly.

[0037] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0038] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A folded winding suitable for a slotless motor, characterized in that, Includes a folding structure and connecting lines; The folding structure is cylindrical in shape. It is formed by arranging and connecting several rectangular modules according to a predetermined pattern, then folding them according to a predetermined pattern, and finally rolling them into a cylindrical shape. The predetermined pattern is such that the side lengths of the rectangular modules gradually increase along the direction of their arrangement, resulting in a stepped shape when the folding structure is laid flat. The predetermined folding pattern is such that the folding directions of adjacent folding positions are opposite. The folding positions are the contact points of adjacent rectangular modules. The folding structure is folded sequentially along the adjacent positions of different rectangular modules, and after folding, the rectangular modules overlap. After rolling, the radial positions of each rectangular module are different, and each rolled-up rectangular module forms a complete circle. The connecting lines are arranged between adjacent rectangular modules to form the wiring of the folded structure; the lengths of the rectangular modules parallel to the fold direction are different, while the lengths perpendicular to the fold direction are the same; the outermost ring of the folded structure is the rectangular module with the longest length parallel to the fold direction, and the innermost ring of the folded structure is the rectangular module with the shortest length parallel to the fold direction. The end of the connecting line is provided with a solder pad for welding; the solder pad connects the branches of the winding belonging to the same phase in series or in parallel by welding; the folded winding can also be connected to the drive control circuit of the motor by welding the lead wire; or the phases can be connected in a star shape by welding the lead wire.

2. A folded winding suitable for a slotless motor according to claim 1, characterized in that, The folded winding has a multi-layer structure, and each layer has a connecting wire.

3. A folded winding suitable for a slotless motor according to claim 1, characterized in that, The rectangular module has through holes, and the connecting lines on each layer of the rectangular module are connected in series or in parallel through the through holes.

4. A folded winding suitable for a slotless motor according to claim 1, characterized in that, The connecting lines include a middle connecting line and end connecting lines; the middle connecting line is the connecting line along the motor axis at the part where the folded structure overlaps with the motor rotor; the end connecting lines are the connecting lines of the rectangular module at both ends, perpendicular to the fold line direction.

5. A folded winding suitable for a slotless motor according to claim 4, characterized in that, The central connecting line is used to conduct current to form an armature magnetic field.

6. A folded winding suitable for a slotless motor according to claim 4, characterized in that, The end connection line is used to connect and conduct the middle connection lines belonging to the same phase on each of the rectangular modules.

7. A folded winding suitable for a slotless motor according to claim 1, characterized in that, The foldable structure is made of a flexible printed circuit board.

Images