Linear motor

Abstract

The utility model relates to the technical field of motor manufacturing, and discloses a linear motor, which comprises a shell and a magnetic induction assembly, the magnetic induction assembly comprises a coil, a magnetic ring and a rotor push rod, the rotor push rod is inserted into the shell, and the magnetic ring is sleeved on the rotor push rod; the coil is arranged in the shell, and the coil and the shell are enclosed to form a motion space for the magnet ring to reciprocate; the magnetic rings and the coils are distributed at intervals in the axis direction of the shell. The magnetic ring is located in the motion space, and the outer diameter of the magnetic ring is larger than the inner diameter of the coil. According to the technical scheme, the magnetic ring is installed on the side face of the coil, so that the outer diameter of the magnetic ring can be larger than the inner diameter of the coil, a larger magnetic ring can be obtained through the arrangement, the larger magnetic ring can generate larger magnetic force, the magnetic force applied to the magnetic ring by the coil is larger, and the thrust of the linear motor pushing out the rotor push rod is larger.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor manufacturing technical field, especially a linear motor. BACKGROUND

[0002] Cylindrical linear motor is a new type of electric actuator, has extensive application field and advantage. It has adopted cylindrical structure design, realizes linear motion in combination with linear drive technology, and has the characteristics of high speed, high precision and high efficiency in the movement process.

[0003] Generally, the structure of cylindrical linear motor is that the coil covers the magnet, that is, the magnet moves in the coil; the magnet in this linear motor is often small, and the magnetic force is weak, resulting in weak thrust of the linear motor.

[0004] The existing cylindrical linear motor generally adopts the structure that the coil covers the magnet, and the magnet moves in the coil. This structure limits the size of the magnet to the inner diameter of the coil, and it is difficult to increase the volume of the magnet, thereby limiting the magnetic force strength and output thrust. Although the performance can be improved to a certain extent by adjusting the material or current parameters, the thrust improvement space is limited due to structural factors. UTILITY MODEL CONTENTS

[0005] The main purpose of the utility model is to provide a linear motor, which aims to increase the thrust of the linear motor.

[0006] In order to achieve the above purpose, the linear motor provided by the utility model comprises:

[0007] A shell; and

[0008] A magnetic sensing assembly, the magnetic sensing assembly comprises a coil, a magnetic ring and a mover push rod, the mover push rod is inserted into the shell, and the magnetic ring is sleeved on the mover push rod; the coil is arranged in the shell and forms a movement space for reciprocating movement of the magnetic ring together with the shell; the magnetic ring and the coil are spaced apart along the axial direction of the shell; the magnetic ring is located in the movement space, and the outer diameter of the magnetic ring is greater than the inner diameter of the coil.

[0009] Optionally, the magnetic sensing assembly comprises a plurality of magnetic rings and a plurality of coils, and the shell and each coil form a plurality of movement spaces; each movement space is located between two adjacent coils, and each magnetic ring is located in a movement space.

[0010] Optionally, the magnetic sensing assembly comprises a plurality of the mover push rods, each of the mover push rods is sequentially connected, and each of the magnetic rings is arranged on one of the mover push rods; the shell is provided with a plurality of mounting holes; each of the mover push rods comprises a front rod and a rear rod, two ends of each of the front rods are connected with two adjacent rear rods respectively, each of the front rods is in sliding connection with an inner peripheral wall of one of the mounting holes, and each of the rear rods is in sliding connection with an inner peripheral wall of one of the mounting holes.

[0011] Optionally, one of the front rods and one of the rear rods in each of the mover push rods enclose a mounting groove, and each of the magnetic rings is in abutment with a groove wall of the mounting groove.

[0012] Optionally, one end of the front rod close to the rear rod and one end of the rear rod close to the front rod in each of the mover push rods are formed with limiting convex rings, and the front rod, the rear rod and the two limiting convex rings enclose the mounting groove.

[0013] Optionally, one end of the front rod close to the rear rod and one end of the rear rod close to the front rod in each of the mover push rods are formed with limiting convex rings, and the front rod, the rear rod and the two limiting convex rings enclose the mounting groove; and an outer diameter of the limiting convex ring is greater than an inner diameter of the mounting hole.

[0014] Optionally, the shell comprises an upper cover and a lower cover, the upper cover is detachably connected with the lower cover, and the upper cover and the lower cover enclose the mounting holes and the movement space.

[0015] Optionally, the linear motor further comprises a support, the support is arranged in the shell and abuts against the coil to limit the coil.

[0016] Optionally, an inner wall of the shell is formed with a limiting convex portion, and the support abuts against the limiting convex portion to limit the support in the shell.

[0017] Optionally, the linear motor further comprises a filler, a filling gap is formed between the shell and an outer peripheral wall of the coil, and the filler is arranged in the filling gap.

[0018] Optionally, the filler is made of heat dissipation silica gel.

[0019] In the technical scheme of the utility model, the linear motor comprises a shell and a magnetic sensing assembly, the magnetic sensing assembly comprises a coil, a magnetic ring and a mover push rod, the mover push rod is inserted into the shell, and the magnetic ring is sleeved on the mover push rod; the coil is arranged in the shell and forms a movement space for reciprocating movement of the magnetic ring together with the shell; the magnetic ring and the coil are distributed along the axial direction of the shell; the magnetic ring is located in the movement space, and the outer diameter of the magnetic ring is larger than the inner diameter of the coil.In the technical scheme of the utility model, the magnetic ring is installed on the side surface of the coil, therefore the outer diameter of the magnetic ring can be larger than the inner diameter of the coil, the larger magnetic ring can be arranged in this way, the larger magnetic ring can generate larger magnetic force, and therefore the magnetic force exerted by the coil on the magnetic ring is larger, so that the thrust of the mover push rod pushed out by the linear motor is also larger. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained according to the structure shown in these drawings without creative labor.

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

[0022] Figure 2 It is the structure schematic diagram of the mover push rod in the linear motor.

[0023] Explanation of reference numerals:

[0024] Reference Name Reference Name 1000 Linear motor 22 Magnetic ring 1 Housing 23 Mover push rod 1a Motion space 231 Front rod 1b Mounting hole 2311 Limiting convex ring 11 Upper cover 232 Rear rod 12 Lower cover 23a Mounting slot 13 Limiting convex part 3 Support 21 Coil 4 Filling piece

[0025] The realization, functional characteristics and advantages of the utility model will be further described with reference to the embodiments and the drawings. DETAILED DESCRIPTION

[0026] The technical scheme in the embodiments of the utility model will be clearly and completely described below in combination with the drawings in the embodiments of the utility model, obviously, the described embodiments are only some embodiments of the utility model, not all the embodiments.Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the protection scope of the utility model.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), if the certain posture changes, the directional indications also change accordingly.

[0028] In addition, the description of "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the technical features or implicitly indicating the number of the technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes, for example, "A and / or B" includes A scheme, or B scheme, or A and B scheme. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor in the protection scope required by the present application.

[0029] Please refer to Figure 1 In order to solve the problem of weak thrust of linear motor, the utility model provides a linear motor 1000, comprising:

[0030] The shell 1 and the magnetic induction assembly, the magnetic induction assembly includes coil 21, magnetic ring 22 and mover push rod 23, the mover push rod 23 is inserted in the shell 1, the magnetic ring 22 is sleeved on the mover push rod 23;Coil 21 is located in the shell 1, and is enclosed with the shell 1 to form a movement space 1a for the reciprocating motion of the magnetic ring 22;Magnetic ring 22 and coil 21 are spaced apart along the axial direction of the shell 1;Magnetic ring 22 is located in the movement space 1a, and the outer diameter of the magnetic ring 22 is greater than the inner diameter of the coil 21.

[0031] In the technical scheme of the present application, the magnetic ring 22 is installed on the side surface of the coil 21, so that the outer diameter of the magnetic ring 22 can be larger than the inner diameter of the coil 21. Such arrangement can obtain a larger magnetic ring 22, which can generate a larger magnetic force. Therefore, the magnetic force exerted by the coil 21 on the magnetic ring 22 is larger, so that the thrust of the linear motor 1000 pushing the mover push rod 23 is also larger.

[0032] The magnetic sensing assembly comprises a plurality of magnetic rings 22 and a plurality of coils 21, and the shell 1 and each coil 21 enclose a plurality of movement spaces 1a; each movement space 1a is located between two adjacent coils 21, and each magnetic ring 22 is located in a movement space 1a. In an embodiment of the utility model, the magnetic sensing assembly comprises two magnetic rings 22 and three coils 21, and the shell 1 and each coil 21 enclose two movement spaces 1a. Taking the magnetic ring 22 in front along the pushing direction of the mover push rod 23 as an example, when the mover push rod 23 is pushed out, the three coils 21 of the magnetic ring 22 can all exert magnetic force on the magnetic ring 22, the coil 21 located in front of the magnetic ring 22 along the pushing direction can generate suction force to attract the magnetic ring 22 to move in the pushing direction, and the two coils 21 located behind the magnetic ring 22 along the pushing direction can both generate repulsion force to push the magnetic ring 22 out in the pushing direction, and the three forces superimposed can generate greater thrust; similarly, the magnetic ring 22 in the rear along the pushing direction of the mover push rod 23 is also subjected to the action force of the three coils 21, the two coils 21 located in front of the magnetic ring 22 along the pushing direction can generate suction force to attract the magnetic ring 22 to move in the pushing direction, and the coil 21 located behind the magnetic ring 22 along the pushing direction can generate repulsion force to push the magnetic ring 22 out in the pushing direction, and the three forces superimposed generate greater thrust; the six forces can all act on the mover push rod 23, so that the six forces superimposed make the linear motor 1000 be able to generate greater thrust.

[0033] Of course, the linear motor 1000 is not limited to two magnetic rings 22 and three coils 21, and the user can set any number of magnetic rings 22 and the corresponding number of coils 21 according to the needs, and the number of magnetic rings 22 and coils 21 is not limited herein.

[0034] The magnetic sensing assembly comprises a plurality of mover push rods 23. In an embodiment of the utility model, the magnetic sensing assembly comprises two mover push rods 23, the two mover push rods 23 are sequentially connected, and each magnetic ring 22 is sleeved on a mover push rod 23; the shell 1 is provided with three mounting holes 1b; each mover push rod 23 comprises a front rod 231 and a rear rod 232, the two ends of each front rod 231 are connected with two adjacent rear rods 232 respectively, each front rod 231 is in sliding connection with the inner peripheral wall of a mounting hole 1b, and each rear rod 232 is in sliding connection with the inner peripheral wall of a mounting hole 1b. The inner peripheral wall of the mounting hole 1b limits the front rod 231 and the rear rod 232 of the mover push rod 23, so that the movement direction of the mover push rod 23 is always consistent, the deviation of the mover push rod 23 during reciprocating motion is avoided, the mover push rod 23 and the magnetic ring 22 can also be suspended in the movement space 1a, the frictional resistance of the contact between the magnetic ring 22 and the shell 1 is eliminated, and therefore the output efficiency of the linear motor 1000 can be improved.

[0035] In an embodiment of the utility model, a front rod 231 and a rear rod 232 in each mover push rod 23 form an installation groove 23a, and each magnetic ring 22 abuts against the groove wall of the installation groove 23a. The magnetic ring 22 is limited in the installation groove 23a, avoiding the magnetic ring 22 from moving relative to the mover push rod 23 and falling off the mover push rod 23, and improving the stability of the linear motor 1000.

[0036] In an embodiment of the utility model, the end of the front rod 231 close to the rear rod 232 and the end of the rear rod 232 close to the front rod 231 in each mover push rod 23 are formed with a limiting convex ring 2311, the front rod 231, the rear rod 232 and the two limiting convex rings 2311 form an installation groove 23a, and the outer diameter of the limiting convex ring 2311 is greater than the inner diameter of the installation hole 1b. The outer diameter of the limiting convex ring 2311 is greater than the inner diameter of the installation hole 1b, so the limiting convex ring 2311 is limited in the movement space 1a, and the magnetic ring 22 and the part of the front rod 231 or the rear rod 232 connected with the magnetic ring 22 are also limited in the movement space 1a, reducing the risk that the mover push rod 23 and the magnetic ring 22 are pushed out of the shell 1 when the motor current is too large.

[0037] In an embodiment of the utility model, the shell 1 comprises an upper cover 11 and a lower cover 12, the upper cover 11 and the lower cover 12 are detachably connected, and the upper cover 11 and the lower cover 12 form the installation hole 1b and the movement space 1a. The upper cover 11 and the lower cover 12 are detachably connected, facilitating the maintenance and repair of the linear motor 1000, and facilitating the installation of the internal elements of the linear motor 1000, such as the mover push rod 23, the coil 21 and the magnetic ring 22.

[0038] In an embodiment of the utility model, the linear motor 1000 further comprises a support 3, the support 3 is arranged in the shell 1 and abuts against the coil 21. In the running process, the linear motor 1000 will vibrate, and the support 3 abutting against the coil 21 can provide sufficient support force for the coil 21, so that the coil 21 remains stable in the movement process, avoiding the position deviation of the coil 21 caused by excessive vibration; meanwhile, the support 3 can also improve the overall structural strength of the linear motor 1000. The support 3 is closely attached to the inner side of the shell 1, enhancing the integrity of the internal structure of the linear motor 1000, so that the linear motor 1000 can more evenly disperse stress when bearing external force, avoiding structural damage caused by stress concentration, thereby prolonging the service life of the linear motor 1000.

[0039] In an embodiment of the utility model, the inner wall of the shell 1 forms a limiting convex part 13, and the support 3 abuts against the limiting convex part 13, so that the support 3 is limited in the shell 1. The support 3 and the coil 21 are prevented from shaking in the shell 1, improving the stability of the internal structure of the linear motor 1000.

[0040] In an embodiment of the present application, the linear motor 1000 further comprises a filler 4, a filler gap is formed between the shell 1 and the outer wall of the coil 21, and the filler 4 is arranged in the filler gap. The filler 4 is arranged between the shell 1 and the coil 21, which can effectively reinforce the coil 21 and maintain the structural stability of the coil 21.

[0041] It can be understood that the material of the filler 4 can be rubber or heat dissipation silica gel. In an embodiment of the present application, the material of the filler 4 is heat dissipation silica gel. Since the linear motor 1000 generates heat when the coil 21 is energized and operates, the heat dissipation silica gel can effectively conduct the heat generated by the coil 21 to the shell 1, and dissipate the heat to the outside through the shell 1, thereby improving the heat dissipation efficiency of the linear motor 1000.

[0042] The above is only the preferred embodiment of the present application, and does not limit the patent range of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields, or the like within the scope of the present application is included in the patent protection range of the present application.

Claims

1. A linear motor (1000) characterized by, The linear motor (1000) comprises a housing (1) and a magnetic sensing assembly. The magnetic sensing assembly comprises a coil (21), a magnetic ring (22) and a mover push rod (23), the mover push rod (23) is arranged in the housing (1), the magnetic ring (22) is sleeved on the mover push rod (23), the coil (21) is arranged in the housing (1) and forms a movement space (1a) with the housing (1) for the magnetic ring (22) to reciprocate, the magnetic ring (22) and the coil (21) are spaced along the axis direction of the housing (1), the magnetic ring (22) is located in the movement space (1a), and the outer diameter of the magnetic ring (22) is greater than the inner diameter of the coil (21). The magnetic sensing assembly comprises a plurality of magnetic rings (22) and a plurality of coils (21), the housing (1) and each coil (21) form a plurality of movement spaces (1a), each movement space (1a) is located between two adjacent coils (21), and each magnetic ring (22) is located in a movement space (1a). The magnetic sensing assembly comprises a plurality of mover push rods (23), each mover push rod (23) is sequentially connected, each magnetic ring (22) is sleeved on a mover push rod (23), the housing (1) is provided with a plurality of mounting holes (1b), each mover push rod (23) comprises a front rod (231) and a rear rod (232), the two ends of each front rod (231) are connected with two adjacent rear rods (232) respectively, each front rod (231) is in sliding connection with the inner wall of a mounting hole (1b), and each rear rod (232) is in sliding connection with the inner wall of a mounting hole (1b).

2. The linear motor (1000) of claim 1, characterized in that, A mounting groove (23a) is formed by a front rod (231) and a rear rod (232) in each mover push rod (23), and each magnetic ring (22) abuts against the groove wall of the mounting groove (23a).

3. The linear motor (1000) of claim 2, characterized in that, Each front rod (231) and each rear rod (232) in each mover push rod (23) form a limiting convex ring (2311) at the end close to each other, and the front rod (231), the rear rod (232) and the two limiting convex rings (2311) form the mounting groove (23a), and the outer diameter of the limiting convex ring (2311) is greater than the inner diameter of the mounting hole (1b).

4. The linear motor (1000) of claim 3, wherein The housing (1) comprises an upper cover (11) and a lower cover (12), the upper cover (11) and the lower cover (12) are detachably connected, and the upper cover (11) and the lower cover (12) form the mounting hole (1b) and the movement space (1a).

5. The linear motor (1000) of claim 4, characterized in that, The linear motor (1000) further comprises a support (3), and the support (3) is arranged in the housing (1) and abuts against the coil (21).

6. The linear motor (1000) of claim 3, wherein, The inner wall of the housing (1) forms a limiting convex portion (13), and the support (3) abuts against the limiting convex portion (13) to limit the support (3) in the housing (1).

7. The linear motor (1000) of claim 1, wherein, ​ 8. The linear motor (1000) of claim 7, characterized in that, ​ 9. The linear motor (1000) according to any one of claims 1 to 8, characterized in that The linear motor (1000) further comprises a filler (4), a filler gap is formed between the shell (1) and the outer peripheral wall of the coil (21), and the filler (4) is arranged in the filler gap.

10. The linear motor (1000) of claim 9, characterized in that, The filler (4) is made of heat-dissipating silica gel.

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