A stator structure of a linear motor
By designing a mountain-shaped silicon steel sheet stacking and fixing structure, the problems of stator eddy currents and mechanical vibration in traditional linear motors were solved, achieving efficient magnetic flux utilization and heat dissipation, and reducing energy consumption and electromagnetic noise.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGGUAN KEDE PRECISION MFG CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-07-14
Smart Images
Figure CN224502988U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of motor technology, specifically relating to a stator structure of a linear motor. Background Technology
[0002] As a highly efficient power transmission device, the stator structure design of a linear motor has a significant impact on its performance and efficiency. Traditional linear motor stators typically use a single iron core structure. This design generates a large range of eddy currents in an alternating magnetic field, leading to increased temperature, limited magnetic flux penetration depth, and severe edge magnetic saturation, thereby increasing energy consumption and reducing operating efficiency.
[0003] Furthermore, traditional silicon steel sheet designs often employ a uniform-width triode structure, resulting in intense magnetic field alternation in the main pole region, high induced eddy current intensity, and rapid temperature increase. Repeated magnetization to deep saturation further increases losses. Simultaneously, the iron core region corresponding to the coil winding ends in traditional designs is a region of abrupt magnetic field change, prone to flux distortion and local saturation, leading to increased iron losses. Moreover, in traditional designs, silicon steel sheets are easily misaligned and rubbed due to high-frequency electromagnetic forces or mechanical vibrations, wearing down the insulating coating and generating additional eddy currents, increasing electromagnetic noise. Utility Model Content
[0004] (1) Technical problems to be solved
[0005] This invention provides a stator structure for a linear motor, aiming to solve the problem of energy loss caused by a large number of eddy currents generated in a single iron core.
[0006] (2) Technical solution
[0007] This utility model provides a stator structure for a linear motor, including a stator and a bracket. The bracket has an internal cavity, and the stator is disposed within the cavity and fixedly connected to the bracket. The stator includes an iron core, an insulating frame, and coil windings. The insulating frame is sleeved on the iron core, and the coil windings are wound around the insulating frame.
[0008] The iron core is composed of several stacked silicon steel sheets. The stacking direction of the silicon steel sheets is perpendicular to the central axis L1 of the insulating frame. The silicon steel sheets are in the shape of a mountain and include a main pole located in the middle and secondary poles located on both sides of the main pole. The width of the main pole is D1, and the top width of the secondary pole is D2, and D1>D2.
[0009] Furthermore, the silicon steel sheet also includes a connecting portion that connects to the bottom end of the secondary electrode and the primary electrode, the width of the connecting portion being D3, and D3 <D2。
[0010] Furthermore, the secondary pole piece includes a reduced portion located at the connection between the secondary pole piece and the connecting portion, and the width of the reduced portion is D4, where D4 = D3. <D2。
[0011] Furthermore, the height of the main pole is H1, the height of the insulating frame is H2, and H1>H2, and the insulating frame is provided with a wire groove for limiting the coil winding.
[0012] Furthermore, the silicon steel sheet is provided with mounting holes, and the stator also includes a mounting latch, which passes through the mounting holes to fix and connect several silicon steel sheets.
[0013] Furthermore, there are four mounting holes, which are symmetrically distributed. Two mounting holes are provided on the main electrode post, and one mounting hole is provided on each of the two secondary electrode posts.
[0014] Furthermore, the thickness D5 of the silicon steel sheet is 0.5 mm, and the number of silicon steel sheets is 20.
[0015] Furthermore, the silicon steel sheet is provided with a connection hole, which is located on the secondary pole, and the silicon steel sheet is fixedly connected to the bracket by a fastener.
[0016] Furthermore, the stator also includes a base, the base having an installation cavity adapted to the connecting portion, the silicon steel sheet being embedded in the installation cavity, the base also having a clearance hole, and the bracket including a first bracket and a second bracket, the first bracket and the second bracket having alignment rods adapted to the clearance hole.
[0017] Furthermore, the insulating frame includes a connecting cavity, the connecting cavity is provided with a boss, and the main pole is provided with a locking position adapted to the boss.
[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0019] 1. By designing the main pole post width D1 to be greater than the secondary pole post top width D2, the cross-sectional area of the main pole post is increased to reduce the magnetic flux density and alleviate magnetic saturation. The narrowing design of the secondary pole post increases the gap between the plates, improves the airflow heat dissipation efficiency, and guides the magnetic lines of force to split to both sides to optimize the magnetic circuit. At the same time, the width of the connecting part D3 = the width of the narrowing part D4 < the width of the secondary pole post top width D2, forming a high magnetic resistance region, which forces the magnetic lines of force to preferentially enter the air gap through the top of the secondary pole post, reducing magnetic leakage at the bottom.
[0020] 2. Four symmetrical mounting holes are provided on the silicon steel sheet, and two holes are provided on the main pole and one hole on each of the secondary poles. The secondary pole holes and the two holes on the main poles form a triangular support, which can resist bending deformation and high-frequency vibration. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model.
[0022] Figure 2 This is an exploded view of the entire utility model.
[0023] Figure 3 This is a schematic diagram of the stator structure of this utility model.
[0024] Figure 4 This is an exploded view of the stator structure of this utility model.
[0025] Figure 5 This is a schematic diagram of the silicon steel sheet structure of this utility model. Figure 1 .
[0026] Figure 6 This is a schematic diagram showing the connection between the base and the silicon steel sheet of this utility model.
[0027] Figure 7 This is a schematic diagram of the silicon steel sheet structure of this utility model. Figure 2 .
[0028] Figure 8 This is an exploded view of the iron core of this utility model.
[0029] Figure 9 This is an exploded view of the insulating frame and coil winding of this utility model.
[0030] Figure 10 This is a schematic diagram of the support structure of this utility model.
[0031] Figure 11 This is an exploded view of the bracket of this utility model.
[0032] Figure 12 This is a schematic diagram of the base structure of this utility model.
[0033] Reference numerals: 1-Stator, 11-Core, 12-Insulating frame, 121-Wire groove, 122-Connecting cavity, 1221-Boss, 13-Coil winding, 14-Mounting latch, 15-Base, 151-Mounting cavity, 152-Allowing hole, 2-Bracket, 21-Cavity, 22-First bracket, 221-Through hole one, 23-Second bracket, 231-Through hole two, 232-Alignment rod, 24-Fastener two, 25-Fastener one, 3-Silicon steel sheet, 31-Main pole post, 311-Clocking position, 32-Second pole post, 321-Reduced part, 33-Connecting part, 34-Mounting hole, 35-Connecting hole. Detailed Implementation
[0034] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.
[0035] like Figures 1-12 As shown, this utility model provides a stator structure for a linear motor, including a stator 1 and a support 2. The support 2 has a cavity 21 inside, and the stator 1 is disposed within the cavity 21. The stator 1 is fixedly connected to the support 2. The stator 1 includes an iron core 11, an insulating frame 12, and a coil winding 13. The insulating frame 12 is sleeved on the iron core 11, and the coil winding 13 is wound around the insulating frame 12.
[0036] Among them, such as Figures 1-4 As shown, the iron core 11 is composed of several stacked silicon steel sheets 3. The stacking direction of the silicon steel sheets 3 is perpendicular to the central axis L1 of the insulating frame 12. The traditional structure of using a whole iron core block will generate a large range of eddy currents in the alternating magnetic field, resulting in high temperature and limited magnetic flux penetration depth, and severe edge magnetic saturation. This design replaces the traditional structure of using a whole iron core 11 as the stator 1 of the linear motor with several stacked silicon steel sheets 3. The insulating coating on the silicon steel sheets 3 cuts off the eddy current path, effectively reducing eddy current loss. Moreover, the vertical stacking allows the magnetic lines of force to propagate along the plane of the silicon steel sheets 3, improving the magnetic flux utilization rate.
[0037] like Figure 5 As shown, in traditional silicon steel sheets 3, the design uses three poles with uniform width. Within the entire iron core 11 or equal-width stacked sheets, the magnetic field alternation is most intense in the main pole 31 region, resulting in the highest induced eddy current intensity and a sharp increase in temperature. The main pole 31 is repeatedly magnetized to a deep saturation region, leading to a significant increase in energy consumption and losses. Therefore, the silicon steel sheet 3 designed in this invention is mountain-shaped, including a main pole 31 in the middle and secondary poles 32 on both sides of the main pole 31. The width of the main pole 31 is... D1, the top width of the secondary pole post 32 is D2, and D1>D2, so that the magnetic force at the main pole post 31 is the strongest; the cross-sectional area of the main pole post 31 is increased, the magnetic flux density is reduced, and the magnetic saturation phenomenon is alleviated; at the same time, the widening design of the main pole post 31 simultaneously enhances the mechanical stability of the iron core 11 and avoids high-frequency vibration deformation; the narrowing of the secondary pole post 32 increases the inter-laminar gap, which is conducive to airflow through the stacking gap, improves the overall heat dissipation efficiency of the stator 1, and causes the magnetic lines of force to be diverted to the secondary pole posts 32 on both sides, optimizing the overall magnetic circuit distribution.
[0038] Furthermore, the extension direction of the main pole post 31 is parallel to the extension direction of the secondary pole post 32.
[0039] like Figure 5As shown, the silicon steel sheet 3 further includes a connecting portion 33 connected to the bottom ends of the secondary pole column 32 and the primary pole column 31. The width of the connecting portion 33 is D3, and D3 < D2. The secondary pole column 32 includes a reduced portion 321. The reduced portion 321 is located at the connection between the secondary pole column 32 and the connecting portion 33. The primary pole column 31, the secondary pole column 32, and the connecting portion 33 are integrally formed. The width of the reduced portion 321 is D4, and D4 = D3 < D2. The connecting portion 33 forms a high magnetic resistance region at the bottom of the secondary pole column 32, forcing the magnetic lines of force to preferentially enter the air gap through the top end of the secondary pole column 32 rather than being short-circuited from the bottom, reducing magnetic leakage, increasing the effective magnetic flux, and forming a magnetic flux contraction point at the root of the secondary pole column 32. The cross-sectional area suddenly decreases, and the local magnetic resistance sharply increases, intercepting the magnetic leakage flowing to the bottom in advance. The connecting portion 33 maintains a high magnetic resistance to completely block the residual magnetic leakage, greatly reducing the ineffective magnetic leakage flux, enabling more magnetic flux to pass through the air gap and act on the mover, and significantly improving the magnetic flux utilization rate and working efficiency.
[0040] As Figure 6 shown, the height of the primary pole column 31 is H1, the height of the insulating frame 12 is H2, and H1 > H2. At the same time, the height difference between the height H1 of the primary pole column 31 and the height H2 of the insulating frame 12 is less than or equal to 0.5 mm. The top end of the primary pole column 31 protrudes from the height of the insulating frame 12, extending an effective magnetic conduction path axially. The primary pole column 31 directly extends towards the air gap direction, providing an additional low magnetic resistance path at the end of the stator 1, guiding more magnetic lines of force to enter the working air gap vertically and efficiently. In the traditional design, the iron core 11 area corresponding to the end of the coil winding 13 is a magnetic field mutation area, prone to magnetic flux distortion and local saturation. However, the prominent design of this application makes the magnetic conductor of the primary pole column 31 cover the outside of the winding end, providing a more natural extension path for the magnetic flux generated at the winding end, reducing the sharp bending of the magnetic lines of force at the edge of the iron core 11, dispersing the magnetic flux density in the end area, alleviating the local magnetic saturation phenomenon, and reducing the iron loss in this area.
[0041] Preferably, as Figure 7 shown, in this embodiment, the thickness D5 of the silicon steel sheet 3 is 0.5 mm, and the number of the silicon steel sheets 3 is 20.
[0042] As Figure 8 shown, the silicon steel sheet 3 is provided with mounting holes 34. The stator 1 further includes mounting latches 14. The mounting latches 14 pass through the mounting holes 34 to fixedly connect several silicon steel sheets 3. By designing the mounting latches 14, several silicon steel sheets 3 can be well fixed, completely avoiding the dislocation and friction of the silicon steel sheets 3 caused by high-frequency electromagnetic force or mechanical vibration, preventing the wear of the insulating coating and the generation of additional eddy currents, and reducing the electromagnetic noise caused by the looseness between the sheets.
[0043] Furthermore, there are four mounting holes 34, which are symmetrically distributed. Two mounting holes 34 are provided on the main pole post 31, and one mounting hole 34 is provided on each of the secondary pole posts 32 located on both sides of the main pole post 31. The mounting holes 34 on the secondary pole posts 32 and the mounting holes 34 on the main pole post 31 form a triangular support frame to resist bending deformation.
[0044] Furthermore, such as Figure 9 As shown, the insulating frame 12 is provided with a wire groove 121 for limiting the coil winding 13, which forces the wires to be arranged according to a preset path, eliminating the loose, misaligned, and overlapping phenomena caused by manual winding or traditional slotless frame, and effectively preventing the wires from fretting or loosening under the action of strong alternating electromagnetic force during high-frequency operation.
[0045] Furthermore, the insulating frame 12 includes a connecting cavity 122, which is adapted to the shape of the main pole post 31. During installation, 20 silicon steel sheets 3 are first connected and fixed by mounting latches 14, and then the connecting cavity 122 of the insulating frame 12 is aligned with the main pole post 31 and inserted to fix the two.
[0046] Furthermore, such as Figure 7 and Figure 9 As shown, the main pole post 31 is provided with a locking position 311, and the connecting cavity 122 is provided with a protrusion 1221 that is adapted to the locking position 311. By setting the locking position 311 and the protrusion 1221 to achieve interlocking, the main pole post 31 and the insulating frame 12 are connected more tightly and are not easy to loosen.
[0047] Furthermore, such as Figures 10-11 As shown, the bracket 2 includes a first bracket 22 and a second bracket 23. The first bracket 22 and the second bracket 23 are provided with through holes 221 at the bottom and top. The first bracket 22 and the second bracket 23 are fixedly connected by fasteners 24 passing through the through holes 221 to form a cavity 21 for accommodating the stator 1.
[0048] Specifically, the silicon steel sheet 3 is provided with a connection hole 35, which is located on the secondary pole post 32. The first bracket 22 and the second bracket 23 are provided with a through hole 231 corresponding to the connection hole 35. The silicon steel sheet 3 and the bracket 2 are fixedly connected together by fastener 25 passing through the connection hole 35 and the through hole 231, so that the stator 1 and the bracket 2 are fixedly connected.
[0049] Specifically, such as Figure 12As shown, since the silicon steel sheets 3 are stacked to form the iron core 11, mechanical vibration will be generated when the motor is working. The stacked silicon steel sheets 3 will have slight displacement, resulting in misalignment. In order to avoid the above situation, the stator 1 also includes a base 15. The base 15 is provided with a mounting cavity 151 adapted to the connecting part 33. The silicon steel sheets 3 are embedded in the mounting cavity 151, which restricts the forward and backward movement of the silicon steel sheets 3. The mounting cavity 151 only covers the connecting part 33 to avoid interfering with the effective magnetic circuit of the main pole post 31 or the secondary pole post 32.
[0050] Furthermore, such as Figures 11-12 As shown, the base 15 is provided with a clearance hole 152, and the first bracket 22 and the second bracket 23 are provided with alignment rods 232 that are adapted to the clearance hole 152. After the stator 1 is assembled, the alignment rods 232 of the first bracket 22 and the second bracket 23 are aligned with the clearance hole 152 and inserted for initial positioning with the stator 1. Then, the first bracket 22 and the second bracket 23 are fixedly connected by fastener 24 passing through the through hole 221 to accommodate and fix the stator 1 therein.
[0051] Preferably, both the base 15 and the bracket 2 are made of non-magnetic aluminum material to reduce the impact on the magnetic field.
[0052] The following is a detailed explanation of the working principle of this utility model;
[0053] First, several silicon steel sheets 3 are connected and fixed to form an iron core 11 by passing through mounting holes 34 with mounting latches. The coil winding 13 is wound on the insulating frame 12. Then, the connecting cavity of the insulating frame 12 is aligned with the main pole post 31 and sleeved on the main pole post 31. The boss 1221 on the insulating frame 12 and the locking position 311 on the main pole post 31 are engaged to achieve connection and fixation. Then, the iron core 11 is inserted into the mounting cavity 151 of the base 15. The alignment rods 232 of the first bracket 22 and the second bracket 23 are aligned with the clearance hole 152 of the base 15 and inserted. Then, the first bracket 22 and the second bracket 23 are fixedly connected by fastener 24 passing through the through hole 221. The stator 1 is accommodated in the cavity 21 formed by the first bracket 22 and the second bracket 23. At this time, the connecting hole 35 Corresponding to the second through hole 231, the stator 1 and the bracket 2 are finally fixedly connected by the fastener 25. In use, the current generates an alternating magnetic field through the coil winding 13. The magnetic lines of force propagate along the plane of the silicon steel sheet 3 and enter the air gap vertically through the widened main pole post 31. The secondary pole post 32 is narrowed to shunt the magnetic flux. The high magnetic resistance of the connecting part 33 blocks the leakage magnetic flux at the bottom and increases the effective magnetic flux. The insulating coated silicon steel sheet 3 cuts off the eddy current path and reduces the loss. The gap of the secondary pole post 32 forms a heat dissipation channel. The airflow carries away the heat. The mounting latch 14 and the base 15 double lock the silicon steel sheet to prevent vibration and misalignment. The winding is fixed by the wire groove 121 to eliminate the micro-movement of the wire caused by electromagnetic force. The first bracket 22 and the second bracket 23 are pre-positioned by the alignment rod 232 and the clearance hole 152. The fastener 25 completes the overall encapsulation to ensure that the stator runs without displacement in the cavity 21.
[0054] The innovation of this utility model lies in the design of the main pole post with a width D1 greater than the top width D2 of the secondary pole post, thereby increasing the cross-sectional area of the main pole post to reduce magnetic flux density and alleviate magnetic saturation. The narrowing design of the secondary pole post increases the gap between the sheets, improves the airflow heat dissipation efficiency, and guides the magnetic lines of force to split to both sides to optimize the magnetic circuit. At the same time, the width of the connecting part D3 = the width of the narrowed part D4 < the top width D2 of the secondary pole post, forming a high magnetic resistance zone, which forces the magnetic lines of force to preferentially enter the air gap through the top of the secondary pole post, reducing magnetic leakage at the bottom. Four symmetrical mounting holes are provided on the silicon steel sheet, and two holes are provided on the main pole post plus one hole on each of the secondary pole posts, which are fixed by mounting latches. The holes of the secondary pole post and the two holes of the main pole post form a triangular support, which can resist bending deformation and high-frequency vibration.
[0055] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style of the specification is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other implementations that can be understood by those skilled in the art.
[0056] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.
Claims
1. A stator structure for a linear motor, characterized in that, The device includes a stator (1) and a support (2). The support (2) has a cavity (21) inside, and the stator (1) is disposed in the cavity (21). The stator (1) is fixedly connected to the support (2). The stator (1) includes an iron core (11), an insulating frame (12), and a coil winding (13). The insulating frame (12) is sleeved on the iron core (11), and the coil winding (13) is wound on the insulating frame (12). The iron core (11) is made of several silicon steel sheets (3) stacked together. The stacking direction of the silicon steel sheets (3) is perpendicular to the central axis L1 of the insulating frame (12). The silicon steel sheets (3) are in the shape of a mountain and include a main pole (31) located in the middle and secondary poles (32) located on both sides of the main pole (31). The width of the main pole (31) is D1, and the top width of the secondary pole (32) is D2, and D1>D2.
2. The stator structure of a linear motor according to claim 1, characterized in that, The silicon steel sheet (3) further includes a connecting part (33) that connects to the bottom ends of the secondary pole (32) and the primary pole (31), the width of the connecting part (33) being D3, and D3 <D2。 3. The stator structure of a linear motor according to claim 2, characterized in that, The secondary pole (32) includes a reduced portion (321), which is located at the connection between the secondary pole (32) and the connecting portion (33). The width of the reduced portion (321) is D4, and D4 = D3.
4. The stator structure of a linear motor according to claim 3, characterized in that, The height of the main pole post (31) is H1, the height of the insulating frame (12) is H2, and H1>H2. The insulating frame (12) is provided with a wire groove (121) for limiting the coil winding (13).
5. The stator structure of a linear motor according to claim 1, characterized in that, The silicon steel sheet (3) is provided with mounting holes (34), and the stator (1) also includes a mounting latch (14), which passes through the mounting holes (34) to fix and connect several silicon steel sheets (3).
6. The stator structure of a linear motor according to claim 5, characterized in that, The mounting holes (34) are provided in four symmetrically distributed. Two mounting holes (34) are provided on the main pole post (31), and one mounting hole (34) is provided on each of the secondary pole posts (32) on both sides.
7. The stator structure of a linear motor according to claim 6, characterized in that, The thickness D5 of the silicon steel sheet (3) is 0.5 mm, and the number of the silicon steel sheets (3) is 20.
8. The stator structure of a linear motor according to claim 7, characterized in that, The silicon steel sheet (3) is provided with a connection hole (35), which is located on the secondary pole (32). The silicon steel sheet (3) is fixedly connected to the bracket (2) by a fastener (25).
9. The stator structure of a linear motor according to claim 2, characterized in that, The stator (1) also includes a base (15), on which a mounting cavity (151) adapted to the connecting part (33) is provided. The silicon steel sheet (3) is embedded in the mounting cavity (151). The base (15) is also provided with a clearance hole (152). The bracket (2) includes a first bracket (22) and a second bracket (23). The first bracket (22) and the second bracket (23) are provided with alignment rods (232) adapted to the clearance hole (152).
10. The stator structure of a linear motor according to claim 1, characterized in that, The insulating frame (12) includes a connecting cavity (122), a boss (1221) is provided on the connecting cavity (122), and a locking position (311) adapted to the boss (1221) is provided on the main pole (31).