Linear motor

Abstract

The utility model discloses a linear motor, which relates to the technical field of motor manufacture, and comprises a shell, a stator and a mover, the stator comprises a winding, the winding comprises a plurality of coils which are sequentially stacked and nested, the outer circumferential wall of the outermost coil of the coils is abutted against the inner circumferential wall of the shell, and the outer circumferential wall of the outermost coil of the coils is abutted against the inner circumferential wall of the shell. The innermost coil in the coils and the shell are enclosed to form a motion cavity; the mover is located in the movement cavity and is in sliding connection with the inner circumferential wall of the innermost coil in the coils. In the technical scheme of the utility model, the plurality of laminated and nested coils form the winding, and the magnetic fields generated by the plurality of coils jointly act on the rotor after being electrified, so that the rotor can be subjected to the superposition effect of push-pull forces generated by the plurality of coils at the same time, thereby increasing the thrust output by the linear motor.

Description

Technical Field

[0001] This utility model relates to the field of motor manufacturing technology, and in particular to a linear motor. Background Technology

[0002] A linear motor is a device that directly converts electrical energy into linear motion mechanical energy. As a type of direct-drive motor, it is widely used in precision positioning, high-speed motion, and automated equipment. Its working principle is to directly convert electrical energy into linear motion through the electromagnetic interaction between the mover structure and the stator. However, currently common linear motors have relatively weak push-pull forces, making them unable to meet the demands of high-load applications. Utility Model Content

[0003] The main purpose of this invention is to propose a linear motor that aims to increase the thrust output of the linear motor.

[0004] To achieve the above objectives, the linear motor proposed in this utility model includes:

[0005] case;

[0006] A stator, comprising windings, the windings comprising a plurality of coils nested in sequence, wherein the outermost coil's outer peripheral wall abuts against the inner peripheral wall of the housing, and the innermost coil and the housing enclose a motion cavity; and

[0007] The mover is located inside the motion cavity and is slidably connected to the inner peripheral wall of the innermost coil among the coils.

[0008] In one embodiment, the winding includes a first coil and a second coil, the outer peripheral wall of the first coil abutting against the inner peripheral wall of the housing, and the first coil being sleeved on the outer peripheral wall of the second coil;

[0009] Define the wire diameter of the first coil as L1, the wire diameter of the second coil as L2, the cross-sectional radius of the first coil as R1, and the cross-sectional radius of the second coil as R2; where L1:L2=R1 2 :R2 2 .

[0010] In one embodiment, the mover includes a magnetic ring and a mover rod, with the magnetic ring sleeved on the mover rod; the outer peripheral wall of the magnetic ring is slidably connected to the inner peripheral wall of the second coil.

[0011] In one embodiment, the moving rod includes a front rod and a rear rod, the front rod being inserted into the magnetic ring, and the rear rod being inserted into the end of the magnetic ring away from the front rod;

[0012] The front rod has a front ring protruding from its peripheral wall, and the rear rod has a rear ring protruding from its peripheral wall. The front ring abuts against the front side wall of the magnetic ring along the direction of the mover's extension, and the rear ring abuts against the rear side wall of the magnetic ring along the direction of the mover's extension.

[0013] In one embodiment, the linear motor further includes two elastic elements, one elastic element having its two ends connected to the front rod and the housing respectively, and the other elastic element having its two ends connected to the rear rod and the housing respectively.

[0014] In one embodiment, the peripheral wall of the front rod forms a front annular groove, and the peripheral wall of the rear rod forms a rear annular groove; one end of one of the elastic elements is connected to the front side wall of the housing along the direction of the mover's extension, and the other end is sleeved in the front annular groove; one end of another elastic element is connected to the rear side wall of the housing along the direction of the mover's extension, and the other end is sleeved in the rear annular groove.

[0015] In one embodiment, the stator includes two windings, and the stator further includes a positioning ring abutting against the inner wall of the housing; the two windings are respectively connected to the front and rear ends of the positioning ring along the moving part's extension direction; the moving part is slidably connected to the inner peripheral wall of the positioning ring.

[0016] In one embodiment, the positioning ring and the housing enclose two mounting slots distributed front and back along the direction of the mover's ejection, and the two windings are respectively disposed in the two mounting slots.

[0017] In one embodiment, the end of the positioning ring away from the housing extends along the front and rear ends of the moving part to form two stop portions, each of the stop portions abutting against a winding to confine the winding within the corresponding mounting groove.

[0018] In one embodiment, the housing includes a cylindrical body and a pressure cap, the pressure cap being detachably connected to the cylindrical body; the outer peripheral wall of the first coil abuts against the inner peripheral wall of the cylindrical body, and the second coil and the pressure cap enclose the moving cavity.

[0019] In this invention, the linear motor includes a housing, a stator, and a mover. The stator includes windings, which consist of multiple coils nested in a stacked manner. The outermost coil's outer peripheral wall abuts against the inner peripheral wall of the housing, and the innermost coil, together with the housing, forms a motion cavity. The mover is located within the motion cavity and is slidably connected to the inner peripheral wall of the innermost coil. In this invention, the multiple nested coils form the windings. When energized, the magnetic fields generated by the multiple coils act on the mover, allowing the mover to simultaneously experience the combined pushing and pulling forces generated by the multiple coils, thereby increasing the thrust output of the linear motor. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0021] Figure 1 A schematic diagram of the structure of an embodiment of the linear motor provided by this utility model;

[0022] Figure 2 This is a schematic diagram of the housing structure in a linear motor.

[0023] Explanation of icon numbers:

[0024] 1000 linear motor 2a Motion cavity 1 case 3 Motion 1a Mounting slot 31 Magnetic ring 11 tube body 32 mover rod 12 Pressure cap 321 Front Pole 2 stator 3211 Front ring 21 winding 321a Front annular groove 211 First coil 322 Rear pole 212 Second coil 3221 Rear Ring 22 Positioning ring 322a Rear annular groove 221 Stop section 4 elastic element

[0025] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0027] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0028] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0029] To solve the above problems, this utility model proposes a linear motor. Figure 1 and Figure 2 This is a schematic diagram of one embodiment of the linear motor provided by this utility model.

[0030] Please refer to Figure 1 and Figure 2 This utility model proposes a linear motor 1000, including a housing 1, a stator 2, and a mover 3. The stator 2 includes a winding 21, which includes multiple coils nested in sequence. The outermost coil of each coil has its outer peripheral wall abutting against the inner peripheral wall of the housing 1. The innermost coil of each coil and the housing 1 enclose a motion cavity 2a. The mover 3 is located in the motion cavity 2a and is slidably connected to the inner peripheral wall of the innermost coil of each coil.

[0031] In the technical solution of this utility model, multiple nested coils form a winding 21. After being energized, the magnetic fields generated by the multiple coils act together on the mover 3, so that the mover 3 can be subjected to the superposition of the push and pull forces generated by the multiple coils at the same time, thereby increasing the thrust output of the linear motor 1000.

[0032] It is understood that the winding may include two stacked coils, or three stacked coils, or even more. In one embodiment of this utility model, the winding 21 includes a first coil 211 and a second coil 212. The outer peripheral wall of the first coil 211 abuts against the inner peripheral wall of the housing 1, and the first coil 211 is sleeved on the outer peripheral wall of the second coil 212. The wire diameter of the first coil 211 is defined as L1, the wire diameter of the second coil 212 is defined as L2, the cross-sectional radius of the first coil 211 is defined as R1, and the cross-sectional radius of the second coil 212 is defined as R2; wherein, L1:L2=R1 2 :R2 2The first coil 211 and the second coil 212 are stacked to form a nested winding 21. When energized, the magnetic flux lines generated by the first coil 211 and the second coil 212 superimpose and act on the mover 3, so that the mover 3 is simultaneously subjected to the push and pull forces of the first coil 211 and the second coil 212. This allows the linear motor 1000 to output a greater thrust, thus enabling the linear motor 1000 to meet the needs of high-load application scenarios. It should be noted that since the first coil 211 is sleeved on the outer peripheral wall of the second coil 212, if the diameter of the copper wire used to wind the first coil 211 and the second coil 212 is the same, the resistance value of the first coil 211 will be significantly greater than that of the second coil 212 (the length of the first coil 211 in the outer layer is greater than the length of the second coil 212 in the inner layer). This will result in an excessively large air gap in the first coil 211, affecting the efficiency of the linear motor 1000. To solve this problem, the ratio of the copper wire diameters used to wind the first coil 211 and the second coil 212 can be adjusted according to their length ratios. Since the resistance of a coil is directly proportional to its length and inversely proportional to its cross-sectional area, the first coil and the second coil are designed with a ratio of L1:L2 = R1. 2 :R2 2 This makes the resistance value of the first coil 211 as consistent as possible with the resistance value of the second coil 212, thereby reducing the air gap of the first coil 211, which can improve the efficiency of the linear motor 1000 and increase the thrust output of the linear motor 1000.

[0033] Based on this, if the winding 21 includes three or more coils, the manufacturer can adjust the ratio between the length and cross-sectional radius of each coil according to the above method so that the resistance value of each coil is consistent, thereby minimizing the air gap of the outer coil, improving the efficiency of the linear motor 1000, and achieving the goal of increasing the output thrust of the linear motor 1000.

[0034] In one embodiment of this utility model, the mover 3 includes a magnetic ring 31 and a mover rod 32, with the magnetic ring 31 sleeved on the mover rod 32; the outer peripheral wall of the magnetic ring 31 is slidably connected to the inner peripheral wall of the second coil 212. The slidable connection between the outer peripheral wall of the magnetic ring 31 and the inner peripheral wall of the second coil 212 allows the mover 3 to form an efficient magnetic field interaction with the winding 21 during movement, optimizing the magnetic field distribution, reducing magnetic field leakage, and thus improving magnetic field utilization.

[0035] In one embodiment of the present invention, the moving rod 32 includes a front rod 321 and a rear rod 322. The front rod 321 is inserted into the magnetic ring 31, and the rear rod 322 is inserted into the end of the magnetic ring 31 away from the front rod 321. The peripheral wall of the front rod 321 is provided with a front section ring 3211, and the peripheral wall of the rear rod 322 is provided with a rear section ring 3221. The front section ring 3211 abuts against the front side wall of the magnetic ring 31 along the pushing direction of the moving rod 3, and the rear section ring 3221 abuts against the rear side wall of the magnetic ring 31 along the pushing direction of the moving rod 3. The plug-in design of the front rod 321 and the rear rod 322 has good adaptability and can be easily integrated into the existing linear motor 1000 structure without large-scale changes to the overall design, thereby reducing manufacturing costs and facilitating subsequent technical improvements and functional expansions. By having the front ring 3211 and the rear ring 3221 abut against the front and rear side walls of the magnetic ring 31 respectively, the overall structural stability of the mover 3 can be enhanced. The abutting action of the front ring 3211 and the rear ring 3221 ensures the fixed position of the magnetic ring 31 on the mover rod 32, reducing the risk of displacement or loosening of the magnetic ring 31 during movement.

[0036] In one embodiment of this utility model, the linear motor 1000 further includes two elastic elements 4. One elastic element 4 has its two ends connected to the front rod 321 and the housing 1, respectively, while the other elastic element 4 has its two ends connected to the rear rod 322 and the housing 1, respectively. The front rod 321 and the rear rod 322 reciprocate, and the two elastic elements 4, due to their own elastic force, apply a pulling force to the front rod 321 and the rear rod 322 in the opposite direction to their movement. The elastic force generated by the stretching of the elastic elements 4 prevents the front rod 321 and the rear rod 322 from impacting the inner wall of the housing 1, thereby achieving bidirectional buffering of the front rod 321 and the rear rod 322, and thus reducing the noise generated by the linear motor 1000.

[0037] In one embodiment of this utility model, the peripheral wall of the front rod 321 forms a front annular groove 321a, and the peripheral wall of the rear rod 322 forms a rear annular groove 322a. One end of an elastic member 4 is connected to the front side wall of the housing 1 along the pushing direction of the mover 3, and the other end is sleeved in the front annular groove 321a. One end of another elastic member 4 is connected to the rear side wall of the housing 1 along the pushing direction of the mover 3, and the other end is sleeved in the rear annular groove 322a. By having the two elastic members 4 respectively sleeved in the front annular groove 321a and the rear annular groove 322a, a stable connection between the elastic member 4 and the front rod 321 and the rear rod 322 can be achieved, thereby preventing the elastic member 4 from slipping off the front rod 321 or the rear rod 322, which would prevent the reciprocating motion of the mover 3 from being effectively buffered.

[0038] It is understood that the two elastic elements 4 can be elastic silicone, springs, or elastic arms. In one embodiment of this utility model, the two elastic elements 4 are elastic silicone. Using silicone as the material of the elastic elements 4 ensures that the elastic elements 4 have excellent elastic properties, thereby enabling the elastic elements 4 to effectively buffer the impact force of the moving rod 32; silicone can maintain stable elasticity during repeated stretching and compression, and will not experience elastic fatigue or deformation due to long-term use, thus ensuring the stability of the linear motor 1000 during long-term operation. In summary, it is preferable that the two elastic elements 4 are elastic silicone.

[0039] In one embodiment of this utility model, air holes are provided on the peripheral wall of the elastic member 4. During the movement of the mover 3, the elastic member 4 may be folded by the mover 3. When folding, the ring walls of the elastic member 4 may come into contact with each other, which may cause friction and generate noise. The air holes on the peripheral wall of the elastic member 4 can reduce the probability of the ring walls coming into contact with each other when the elastic member 4 is folded, thereby reducing the probability of noise generation by the elastic member 4 to a certain extent. At the same time, the presence of air holes allows the air in the motion cavity 2a to circulate with the outside, which helps to dissipate heat during the operation of the linear motor 1000, thereby improving the heat dissipation efficiency of the motor. In addition, the design of air holes can prevent air from being compressed inside the elastic member 4, thereby reducing the resistance encountered by the mover 3 when moving forward or backward, which helps to improve the working efficiency of the linear motor 1000 and reduce the additional load on the linear motor 1000 caused by air compression.

[0040] The elastic element 4 can be elongated, ring-shaped, or any other shape; no limitation is imposed here. Please refer to [reference needed]. Figure 2 In one embodiment of this utility model, the elastic element 4 is ring-shaped, which can ensure that the elastic element 4 can maintain the connection between its two ends and the outer shell 1 and the mover 3 when it deforms due to elastic force; at the same time, the ring-shaped design can also keep the tension applied by the elastic element 4 to various positions on the outer wall of the mover 3 balanced, thereby keeping the structure of the linear motor 1000 stable and helping the mover 3 to maintain stable reciprocating motion; therefore, the elastic element 4 is preferably ring-shaped.

[0041] In one embodiment of this utility model, the stator 2 includes two windings 21, and the stator 2 also includes a positioning ring 22, which is disposed on the inner wall of the housing 1; the two windings 21 are respectively connected to the front and rear ends of the positioning ring 22 along the pushing direction of the mover 3; the mover 3 is slidably connected to the inner peripheral wall of the positioning ring 22. By fixing the two windings 21 with the positioning ring 22, the air gap of the coil in the linear motor 1000 can be reduced, the magnetic field utilization rate can be improved, the power loss can be reduced, and thus the efficiency and thrust of the linear motor 1000 can be improved.

[0042] Please see Figure 2In one embodiment of this utility model, the positioning ring 22 and the housing 1 enclose and form two mounting grooves 1a distributed front and back along the direction of the movement of the mover 3, and the two windings 21 are respectively disposed in the two mounting grooves 1a. The two mounting grooves 1a formed by the positioning ring 22 and the housing 1 can provide a stable mounting position for the windings 21, ensure the positional accuracy of the windings 21 during installation and operation, reduce the magnetic field instability caused by the displacement or vibration of the windings 21, and thus avoid affecting the stability of the movement of the mover 3.

[0043] In one embodiment of this utility model, the end of the positioning ring 22 away from the housing 1 extends along the front and rear ends of the moving part 3 to form two stop portions 221. Each stop portion 221 abuts against a winding 21 to confine the winding 21 within the corresponding mounting groove 1a. The mechanical limiting method further ensures the stability of the winding 21, thereby ensuring that the winding 21 will not loosen due to vibration during operation, thus further improving the operational stability of the linear motor 1000.

[0044] In one embodiment of this utility model, the housing 1 includes a cylindrical body 11 and a pressure cap 12, the pressure cap 12 being detachably connected to the cylindrical body 11; the outer peripheral wall of the first coil 211 abuts against the inner peripheral wall of the cylindrical body 11, and the second coil 212 and the pressure cap 12 enclose a motion cavity 2a. This makes the assembly and maintenance of the linear motor 1000 more convenient and quick. By disassembling the pressure cap 12, internal components (such as coils, movers, etc.) can be easily inspected, repaired, or replaced, thereby reducing maintenance costs and time.

[0045] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A linear motor (1000), characterized in that, include: Shell (1); Stator (2), the stator (2) including windings (21), the windings (21) including a plurality of coils nested in sequence, the outer peripheral wall of the outermost coil abutting the inner peripheral wall of the housing (1), the innermost coil and the housing (1) enclosing a motion cavity (2a); and The mover (3) is located inside the motion cavity (2a) and is slidably connected to the inner peripheral wall of the innermost coil among the coils.

2. The linear motor (1000) as described in claim 1, characterized in that, The winding (21) includes a first coil (211) and a second coil (212). The outer peripheral wall of the first coil (211) abuts against the inner peripheral wall of the housing (1), and the first coil (211) is sleeved on the outer peripheral wall of the second coil (212). Define the wire diameter of the first coil (211) as L1, the wire diameter of the second coil (212) as L2, the cross-sectional radius of the first coil (211) as R1, and the cross-sectional radius of the second coil (212) as R2; wherein, L1:L2=R1 2 :R2 2 .

3. The linear motor (1000) as described in claim 2, characterized in that, The mover (3) includes a magnetic ring (31) and a mover rod (32), with the magnetic ring (31) sleeved on the mover rod (32); the outer peripheral wall of the magnetic ring (31) is slidably connected to the inner peripheral wall of the second coil (212).

4. The linear motor (1000) as described in claim 3, characterized in that, The moving rod (32) includes a front rod (321) and a rear rod (322). The front rod (321) is inserted into the magnetic ring (31), and the rear rod (322) is inserted into the end of the magnetic ring (31) away from the front rod (321). The front rod (321) has a front ring (3211) protruding from its peripheral wall, and the rear rod (322) has a rear ring (3221) protruding from its peripheral wall. The front ring (3211) abuts against the front side wall of the magnetic ring (31) along the pushing direction of the mover (3), and the rear ring (3221) abuts against the rear side wall of the magnetic ring (31) along the pushing direction of the mover (3).

5. The linear motor (1000) as described in claim 4, characterized in that, The linear motor (1000) also includes two elastic elements (4). One elastic element (4) is connected at both ends to the front rod (321) and the housing (1), respectively, and the other elastic element (4) is connected at both ends to the rear rod (322) and the housing (1).

6. The linear motor (1000) as described in claim 5, characterized in that, The peripheral wall of the front rod (321) forms a front annular groove (321a), and the peripheral wall of the rear rod (322) forms a rear annular groove (322a); one end of one elastic member (4) is connected to the front side wall of the housing (1) along the pushing direction of the mover (3), and the other end is sleeved in the front annular groove (321a); ​​one end of another elastic member (4) is connected to the rear side wall of the housing (1) along the pushing direction of the mover (3), and the other end is sleeved in the rear annular groove (322a).

7. The linear motor (1000) as described in any one of claims 1 to 6, characterized in that, The stator (2) includes two windings (21), and the stator (2) also includes a positioning ring (22), which abuts against the inner wall of the housing (1); the two windings (21) are respectively connected to the front and rear ends of the positioning ring (22) along the pushing direction of the mover (3); the mover (3) is slidably connected to the inner peripheral wall of the positioning ring (22).

8. The linear motor (1000) as described in claim 7, characterized in that, The positioning ring (22) and the housing (1) enclose each other to form two mounting grooves (1a) distributed in the front and back along the pushing direction of the mover (3), and the two windings (21) are respectively disposed in the two mounting grooves (1a).

9. The linear motor (1000) as described in claim 8, characterized in that, The positioning ring (22) extends from the end away from the housing (1) to form two stop portions (221) along the front and rear ends of the push-out direction of the mover (3). Each stop portion (221) abuts against a winding (21) to confine the winding (21) within the corresponding mounting groove (1a).

10. The linear motor (1000) as described in any one of claims 2 to 6, characterized in that, The housing (1) includes a cylindrical body (11) and a pressure cap (12), the pressure cap (12) being detachably connected to the cylindrical body (11); the outer peripheral wall of the first coil (211) abuts against the inner peripheral wall of the cylindrical body (11), and the second coil (212) and the pressure cap (12) enclose the motion cavity (2a).

Images