Magnetic gathering type non-magnetic track linear motor

Abstract

The utility model discloses a magnetism gathering type non-magnetic track linear motor, comprising a mover which comprises a mover iron core, a plurality of permanent magnet groups arranged at the lower end of the mover iron core and a plurality of coils arranged on the mover iron core, the mover iron core is provided with a plurality of armature teeth distributed at intervals, and the coils are arranged on the peripheries of the armature teeth in a surrounding manner; the permanent magnet group is embedded and fixed at the lower ends of the armature teeth and exposed on the lower end surfaces of the armature teeth; the stator is formed by superposing a plurality of first silicon steel sheets and is positioned below the permanent magnet group, and an air gap is formed between the stator and the permanent magnet group; each permanent magnet group consists of a radial magnetizing permanent magnet as well as a first axial magnetizing permanent magnet and a second axial magnetizing permanent magnet which are clamped on two sides of the radial magnetizing permanent magnet, the magnetizing direction of the second axial magnetizing permanent magnet is axially leftward so as to face the radial magnetizing permanent magnet, the magnetizing direction of the first axial magnetizing permanent magnet is axially rightward so as to face the radial magnetizing permanent magnet, and the magnetizing direction of the second axial magnetizing permanent magnet is axially rightward. The magnetizing direction of the radial magnetizing permanent magnet is downward in the radial direction, and the radial magnetizing permanent magnet faces the stator, so that a Halbach array magnetism gathering structure is formed.

Description

TECHNICAL FIELD

[0001] The utility model relates to linear motor product technical field, especially a kind of magnetic type non-magnetic track linear motor. BACKGROUND

[0002] Linear motor is a kind of transmission device that directly converts electric energy into linear motion mechanical energy without any intermediate conversion mechanism, and linear motor is also called linear motor, linear motor, linear motor, push rod motor. After the power of this motor, linear motion can be directly generated, so it is particularly suitable for occasions requiring linear motion. Compared with traditional rotary motor, linear motor has the characteristics of high speed, high response, high precision and direct drive, and is widely used in industrial automation field.

[0003] In recent years, the demand for linear motors has increased year by year, and the growth rate is stable, but the price of the material (praseodymium-neodymium) required for the permanent magnet of linear motor has been rising. The demand for linear motor with low magnetic steel, high thrust density, high efficiency, high precision and high reliability has increased, which has become the research direction favored by researchers in recent years.

[0004] The utility model discloses a kind of linear motors convenient to maintain, it includes linear motor body, the upper surface of the linear motor body is fixedly installed with two guide rails, the outer surface of two guide rails is slidably sleeved with sliding block, the upper surface of linear motor body is fixedly installed with magnetic rail, the upper surface of linear motor body is fixedly installed with two baffle, the opposite surface of two baffle is provided with buffer rubber pad, and two buffer rubber pads are mirror image setting, the opposite surface of two baffle is provided with quick disassembly and assembly mechanism, and its working principle is: after starting linear motor body, sliding block is driven on the outer surface of two guide rails by magnetic rail and moves.

[0005] The above linear motor needs to lay multiple magnets on the entire stroke to form a magnetic rail, so that its cost is high. Moreover, the magnet utilization rate on the stator of the linear motor body is low. Only the part coinciding with the mover in the sliding block can provide an effective magnetic field to generate thrust. The part not coinciding with the mover also provides a magnetic field, but this magnetic field is harmful and useless. It not only cannot contribute to thrust, but also attracts magnetic material, cannot guarantee that the working environment is free of strong magnetic danger, reduces the service life of the linear motor, increases the maintenance cost of the linear motor, and is not conducive to the market competitiveness of the product.

[0006] Therefore, the present inventors propose the following technical solution. UTILITY MODEL CONTENTS

[0007] The utility model aims at overcoming the shortcomings of prior art, and provides a kind of magnetic type non-magnetic track linear motor.

[0008] In order to solve the above technical problems, the utility model adopts the following technical scheme: the poly magnetic type non-magnetic track linear motor includes: the rotor, it includes rotor core and multiple groups of setting in the lower end of rotor core permanent magnet group and multiple setting in the upper of rotor core and corresponding distribution in the outer periphery of permanent magnet group coil, the rotor core has multiple downward protruding and interval distribution armature tooth, the coil is surrounded in the outer periphery of armature tooth;The permanent magnet group is inlaid and fixed in the lower end of armature tooth, and is exposed in the lower end surface of armature tooth;The stator is by multiple first silicon steel sheet fixed together and is located under permanent magnet group, and forms air gap;Each group of permanent magnet group is by radial magnetization permanent magnet and the first axial magnetization permanent magnet and the second axial magnetization permanent magnet clamped in the both sides of radial magnetization permanent magnet, wherein, the magnetization direction of the second axial magnetization permanent magnet is axial left, to the radial magnetization permanent magnet, the magnetization direction of the first axial magnetization permanent magnet is axial right, to the radial magnetization permanent magnet, the magnetization direction of the radial magnetization permanent magnet is radial downward, to the stator, to form the Halbach array magnetic structure.

[0009] Further, in the above technical solution, the lower end surface of the armature tooth is provided with a rectangular groove;The first axial magnetization permanent magnet and the second axial magnetization permanent magnet are inlaid and fixed in the rectangular groove after being attached to the two sides of the radial magnetization permanent magnet, and there is no gap between them.

[0010] Further, in the above technical solution, the longitudinal section of the first axial magnetization permanent magnet, the second axial magnetization permanent magnet and the radial magnetization permanent magnet is rectangular, and the height of each is equal to the depth of the rectangular groove, so that the lower end surface of the first axial magnetization permanent magnet, the second axial magnetization permanent magnet and the radial magnetization permanent magnet is flush with the lower end surface of the armature tooth, and the first axial magnetization permanent magnet, the second axial magnetization permanent magnet and the radial magnetization permanent magnet are completely inlaid in the rectangular groove of the armature tooth.

[0011] Further, in the above technical solution, the first axial magnetization permanent magnet and the second axial magnetization permanent magnet are of the same size, and the width of the first axial magnetization permanent magnet and the second axial magnetization permanent magnet is greater than the width of the radial magnetization permanent magnet.

[0012] Further, in the above technical solution, the number of armature teeth is 6N, wherein N is greater than or equal to 1.

[0013] Further, in the above technical solution, the rotor core is composed of multiple second silicon steel sheets.

[0014] Further, in the above technical solution, the first silicon steel sheet has multiple equidistantly distributed rectangular teeth, and the rectangular teeth of the multiple first silicon steel sheets form rectangular tooth poles after being stacked.

[0015] Further, in the above technical solution, the extending direction of the rectangular tooth pole is perpendicular to the length direction of the stator.

[0016] Further, in the above technical solution, the extending direction of the rectangular tooth pole forms an angle less than 90° with the length direction of the stator, so that the rectangular tooth pole is obliquely distributed on the upper end of the stator.

[0017] Further, in the above technical solution, the interval size between the two adjacent rectangular tooth poles is greater than the interval size between the two adjacent armature teeth, and the width size of the armature tooth is greater than the interval size between the two adjacent rectangular tooth poles.

[0018] After the above technical solution is adopted, the utility model has the following beneficial effects compared with the prior art:

[0019] 1. The utility model belongs to a kind of topology structure of magnetic flux reversal linear motor, its characteristics are that coil and permanent magnet are integrated on mover, so that the use cost of linear motor is reduced, and permanent magnet utilization is high, it is suitable for long stroke application scene;Meanwhile, the stator is formed by the first silicon steel sheet of multiple pieces being stacked and fixed together, and its structure is relatively simple, easy to machine, for the application field of long stroke, the use cost of motor can be greatly reduced, the amount of permanent magnet is reduced, and the structure stability is good, at the same time, the stator is without magnet, i.e. the utility model is without magnetic track, i.e. the stator structure does not contain magnetism, for practical application environment, it ensures that there is no strong magnetic danger in working environment, improves the service life of linear motor, reduces the maintenance cost of linear motor.In addition, the magnetic permeability of the first silicon steel sheet is higher than air, which is conducive to improving the thrust density and air gap flux density of motor.

[0020] 2. In the utility model, the mover is composed of three different magnetization directions permanent magnet groups, and each armature tooth of the mover contains a permanent magnet group, i.e. each permanent magnet group has three different magnetization directions, but the direction is concentrated in the midpoint position, improves the utilization rate of permanent magnet, so that the magnetic density on the side close to air gap increases, and the magnetic density on the side away from air gap decreases. SHEET:

[0021] Figure 1 It is the structure diagram of the utility model;

[0022] Figure 2 It is the perspective view of the mover core in the utility model;

[0023] Figure 3 It is the perspective view of the mover in the utility model;

[0024] Figure 4 It is the perspective view of the stator in the utility model;

[0025] Figure 5is the magnetizing direction principle drawing of the permanent magnet group in the utility model;

[0026] Figure 6 is the plan view of the stator of the first structure in the utility model;

[0027] Figure 7 is the plan view of the stator of the second structure in the utility model. DETAILED DESCRIPTION

[0028] The utility model is further explained in connection with specific embodiments and drawings.

[0029] See Figures 1-7 As shown in the figure, it is a kind of magnetic gathering type non-magnetic rail linear motor, which includes: mover 100 and stator 4, and the air gap is formed between the mover 100 and the stator 4.The utility model belongs to a kind of topological structure of magnetic flux reverse linear motor, its characteristics are that coil and permanent magnet are integrated on mover, so that the use cost of linear motor is reduced, and permanent magnet utilization is high, suitable for long-stroke application scenarios.

[0030] The structure of the mover 100 is specifically described as follows:

[0031] The mover 100 includes mover core 1 and multiple groups of permanent magnet groups 2 arranged at the lower end of the mover core 1 and multiple coils 3 arranged on the mover core 1 and corresponding to the distribution of the permanent magnet groups 2 periphery, the mover core 1 has multiple armature teeth 11 protruding downward and spaced distribution, and the coil 3 is arranged around the periphery of the armature tooth 11;The permanent magnet group 2 is embedded and fixed at the lower end of the armature tooth 11 and exposed at the lower end surface of the armature tooth 11;Wherein, each group of permanent magnet groups 2 is composed of radial magnetization permanent magnet 21 and first axial magnetization permanent magnet 22 and second axial magnetization permanent magnet 23 clamped on both sides of the radial magnetization permanent magnet 21, wherein the magnetization direction of all permanent magnets in each group of permanent magnet groups 2 is different, specifically: the magnetization direction of the second axial magnetization permanent magnet 23 is axially left to the radial magnetization permanent magnet 21, the magnetization direction of the first axial magnetization permanent magnet 22 is axially right to the radial magnetization permanent magnet 21, and the magnetization direction of the radial magnetization permanent magnet 21 is radially downward to the stator 4, to form a Halbach array magnetic structure, and the arrangement mode of the radial magnetization permanent magnet 21, the first axial magnetization permanent magnet 22 and the second axial magnetization permanent magnet 23 makes the magnetic force lines of each group of permanent magnets distribute in the middle;Compared with ordinary permanent magnet array combination, the structure belongs to Halbach type (Halbach array) magnetic structure, and the characteristic of the structure is that the magnetic density of the side close to the air gap increases, and the magnetic density of the side away from the air gap decreases.

[0032] The stator 4 is a long strip-shaped sawtooth structure, the length of which can be designed according to actual use requirements, specifically, the stator 4 is composed of a plurality of first silicon steel sheets stacked and fixed together, is located below the permanent magnet group 2, and forms an air gap. That is, the structure features that the coil and the permanent magnet are integrated on the mover, so that the use cost of the linear motor is reduced, the utilization rate of the permanent magnet is high, and the linear motor is suitable for long-stroke application scenarios. Meanwhile, the stator 4 is composed of a plurality of first silicon steel sheets stacked and fixed together, the structure is relatively simple, and the stator 4 is convenient for mechanical processing. For the application field of long stroke, the use cost of the motor can be greatly reduced, the amount of the permanent magnet is reduced, and the structure stability is good. Meanwhile, the stator 4 is free of magnets, that is, the linear motor is free of magnetic tracks, and the stator structure does not contain magnetism. For the actual application environment, the working environment is ensured to be free of strong magnetic danger, the service life of the linear motor is improved, and the maintenance cost of the linear motor is reduced.

[0033] The stator 6 has a relatively simple structure and is a sawtooth structure composed of a plurality of first silicon steel sheets stacked together. This structure is conducive to mechanical processing, and for the application field of long stroke, the use cost of the motor can be greatly reduced, and the amount of the permanent magnet is reduced.

[0034] The number of the armature teeth 11 is 6N, wherein N is greater than or equal to 1. In this embodiment, N is equal to 1, that is, the number of the armature teeth 11 is 6. That is, each mover 100 has six groups of permanent magnet groups, each group of permanent magnet groups is composed of three permanent magnets (namely, the radial magnetization permanent magnet 21, the first axial magnetization permanent magnet 22 and the second axial magnetization permanent magnet 23), the magnetization directions of the three permanent magnets are different, and specifically, the magnetization direction of the second axial magnetization permanent magnet 23 is axially left, the magnetization direction of the first axial magnetization permanent magnet 22 is axially right, the magnetization direction of the radial magnetization permanent magnet 21 is radially downward, and the arrangement mode of the radial magnetization permanent magnet 21, the first axial magnetization permanent magnet 22 and the second axial magnetization permanent magnet 23 makes the magnetic force lines of each group of permanent magnets be distributed around the middle. Compared with a common permanent magnet array combination, the structure belongs to a Halbach type (Halbach array) magnetic aggregation structure, and the structure has the characteristics that the magnetic density on the side close to the air gap is increased, and the magnetic density on the side away from the air gap is reduced.

[0035] In other words, the mover 100 in the utility model is composed of three permanent magnets with different directions to form a unit (namely, a permanent magnet group), each mover has an armature tooth 11 containing a unit, and one mover has 6 armature teeth and a multiple of 6 armature teeth, and can be randomly switched into a mover with different lengths to adapt to application scenarios under different thrust working conditions. Each permanent magnet group has three different magnetization directions, but the directions are concentrated on the midpoint position, the utilization rate of the permanent magnet is improved, the magnetic density on the side close to the air gap is increased, and the magnetic density on the side away from the air gap is reduced.

[0036] The armature tooth 11 is rectangular, and the lower end surface of the armature tooth 11 is provided with a rectangular slot 111; the first axial magnetization permanent magnet 22 and the second axial magnetization permanent magnet 23 are respectively inlaid and fixed in the rectangular slot 111 after being attached to the two side surfaces of the radial magnetization permanent magnet 21, and there is no gap between them, the assembly structure is simple and stable, and the mechanical air gap of the assembly structure is smaller than that of the permanent magnet directly attached to the lower surface of the armature tooth 11, in addition, the mover iron core is composed of a plurality of second silicon steel sheets, and the magnetic permeability of the second silicon steel sheet is higher than that of air, which is beneficial to improve the thrust density and air gap magnetic flux density of the motor, reduce the thrust fluctuation, and better meet the application scene of high thrust, so that the utility model has stronger market competitiveness.

[0037] In the embodiment, the rectangular slot 111 penetrates the front and rear end surfaces of the armature tooth 11, and the front and rear end surfaces of the first axial magnetization permanent magnet 22, the second axial magnetization permanent magnet 23 and the radial magnetization permanent magnet 21 are flush with the front and rear end surfaces of the armature tooth 11, and the coil 3 is attached and wrapped around the front and rear end surfaces of the first axial magnetization permanent magnet 22, the second axial magnetization permanent magnet 23 and the radial magnetization permanent magnet 21.

[0038] In some embodiments, the armature tooth 11 is provided with an annular slot, the coil 3 is wrapped in the annular slot, and the annular slot can play a certain limiting role on the coil 3, which can ensure the stability of the assembly structure.

[0039] The longitudinal section of the first axial magnetization permanent magnet 22, the second axial magnetization permanent magnet 23 and the radial magnetization permanent magnet 21 is rectangular, and the height of each is equal to the depth of the rectangular slot 111, so that the lower end surface of the first axial magnetization permanent magnet 22, the second axial magnetization permanent magnet 23 and the radial magnetization permanent magnet 21 is flush with the lower end surface of the armature tooth 11, and the first axial magnetization permanent magnet 22, the second axial magnetization permanent magnet 23 and the radial magnetization permanent magnet 21 are completely inlaid in the rectangular slot 111 of the armature tooth 11.

[0040] The first axial magnetization permanent magnet 22 and the second axial magnetization permanent magnet 23 are of the same size, and the width of the first axial magnetization permanent magnet 22 and the second axial magnetization permanent magnet 23 is greater than the width of the radial magnetization permanent magnet 21.

[0041] The first silicon steel sheet has a plurality of equidistantly distributed rectangular teeth, and the rectangular teeth of the plurality of first silicon steel sheets form a rectangular tooth pole 41 after being stacked, that is, a sawtooth structure. That is, since the stator 4 adopts the sawtooth structure formed by stacking a plurality of first silicon steel sheets, it is beneficial to cut the magnetic density line in the running state of the mover, improve the thrust density of the linear motor, and further improve the thrust performance of the linear motor.

[0042] The extension direction of the rectangular tooth pole 41 at least includes the following two:

[0043] The first is that the extending direction of the rectangular salient pole 41 is perpendicular to the length direction of the stator 4.

[0044] The second is that the extending direction of the rectangular salient pole 41 forms an angle less than 90° with the length direction of the stator 4, so that the rectangular salient pole 41 is distributed on the upper end of the stator 4 in an inclined manner. The rectangular salient pole 41 distributed in an inclined manner (i.e. inclined pole) can reduce the high thrust fluctuation caused by the linear motor, i.e. solve the problem of large magnetic resistance caused by the disconnection of the mover on both sides and the double salient structure of the linear motor, and is beneficial to optimizing the performance of the linear motor.

[0045] The interval size between the adjacent two rectangular salient poles 41 is greater than the interval size between the adjacent two armature teeth 11, and the width size of the armature tooth 11 is greater than the interval size between the adjacent two rectangular salient poles 41, which can better cut the magnetic density line of the mover in the running state, improve the thrust density of the linear motor, and further improve the thrust performance of the linear motor.

[0046] The above-mentioned magnetic density, i.e. magnetic flux density, is also called magnetic induction intensity, which is an important physical quantity for describing the strength and direction of the magnetic field.

[0047] In actual use, the stator is laid on the machine base, and the machine base is also provided with a wire track, which is distributed outside the stator and parallel to the stator. The sliding seat is installed on the wire track through a sliding block and located above the stator, and the sliding seat can slide along the length direction of the wire track. The mover core 1 of the mover is fixed to the lower end of the middle part of the sliding seat, and the mover core 1 is positioned above the stator, and the air gap is formed therebetween. When the coil of the mover is energized, the mover can slide relative to the stator, i.e. the sliding seat can be driven to move linearly on the machine base through the wire track.

[0048] In summary, the utility model belongs to a kind of topology structure of magnetic flux reverse linear motor, its characteristics are that coil and permanent magnet are integrated on mover, so that the use cost of linear motor is reduced, the utilization rate of permanent magnet is high, suitable for long stroke application scene;Meanwhile, the stator 4 is composed of a plurality of first silicon steel sheets fixed together, which has simple structure and is easy to machine. For long stroke application field, the use cost of motor can be greatly reduced, the amount of permanent magnet is reduced, and the structure stability is good. At the same time, the stator 4 has no magnet, i.e. the utility model has no magnetic track, i.e. the stator structure does not contain magnetism. For actual application environment, it ensures that the working environment is not dangerous with strong magnetism, improves the service life of linear motor, and reduces the maintenance cost of linear motor.

[0049] The rotor 100 is composed of three permanent magnet groups with different magnetization directions, each rotor's armature tooth 11 contains a permanent magnet group, that is, each permanent magnet group has three different magnetization directions, but the directions are concentrated at the midpoint position, the utilization rate of the permanent magnet is improved, the magnetic density on the side close to the air gap is increased, and the magnetic density on the side away from the air gap is reduced.

[0050] Of course, the above only is the specific embodiment of the present application, and does not limit the scope of the present application, and equivalent changes or modifications made according to the structure, features and principles described in the patent application scope of the present application should be included in the patent application scope of the present application.

Claims

1. A poly-magnetic non-magnetic rail linear motor characterized by: It includes: The mover (100) includes a mover core (1) and a plurality of groups of permanent magnet groups (2) arranged at the lower end of the mover core (1) and a plurality of coils (3) arranged on the mover core (1) and corresponding to the distribution of the permanent magnet groups (2) on the periphery, the mover core (1) has a plurality of downward protruding and spaced apart armature teeth (11), and the coils (3) are arranged on the periphery of the armature teeth (11); the permanent magnet group (2) is embedded and fixed at the lower end of the armature tooth (11), and is exposed at the lower end surface of the armature tooth (11); The stator (4) is composed of a plurality of first silicon steel sheets stacked and fixed together, and is located below the permanent magnet group (2) and forms an air gap; Each group of permanent magnet groups (2) is composed of a radial magnetization permanent magnet (21) and a first axial magnetization permanent magnet (22) and a second axial magnetization permanent magnet (23) clamped on both sides of the radial magnetization permanent magnet (21), wherein the second axial magnetization permanent magnet (23) is magnetized in the axial direction to the left, towards the radial magnetization permanent magnet (21), the first axial magnetization permanent magnet (22) is magnetized in the axial direction to the right, towards the radial magnetization permanent magnet (21), and the radial magnetization permanent magnet (21) is magnetized in the radial direction downward, towards the stator (4), to form a Halbach array magnetic structure.

2. The magnetic concentrating linear motor without magnetic rail according to claim 1, characterized in that: The lower end surface of the armature tooth (11) is provided with a rectangular groove (111); the first axial magnetization permanent magnet (22) and the second axial magnetization permanent magnet (23) are respectively embedded and fixed in the rectangular groove (111) after being fitted with the two side surfaces of the radial magnetization permanent magnet (21), and there is no gap between them.

3. The magnetic concentrating linear motor without magnetic rail according to claim 2, characterized in that: The longitudinal section of the first axial magnetization permanent magnet (22), the second axial magnetization permanent magnet (23) and the radial magnetization permanent magnet (21) is rectangular, and the height of each is equal to the depth of the rectangular groove (111), so that the lower end surface of the first axial magnetization permanent magnet (22), the second axial magnetization permanent magnet (23) and the radial magnetization permanent magnet (21) is flush with the lower end surface of the armature tooth (11), and the first axial magnetization permanent magnet (22), the second axial magnetization permanent magnet (23) and the radial magnetization permanent magnet (21) are completely embedded in the rectangular groove (111) of the armature tooth (11).

4. The magnetic concentrating linear motor without magnetic rail according to claim 3, characterized in that: The first axial magnetization permanent magnet (22) and the second axial magnetization permanent magnet (23) are the same size, and the width of the first axial magnetization permanent magnet (22) and the second axial magnetization permanent magnet (23) is greater than the width of the radial magnetization permanent magnet (21).

5. The magnetic field focusing and collecting linear motor without magnetic rail according to any one of claims 1-4, characterized in that: The number of armature teeth (11) is 6N, wherein N is greater than or equal to 1.

6. A magnetic field focusing linear motor without magnetic track according to any one of claims 1-4, characterized in that: The mover core is composed of a plurality of second silicon steel sheets stacked and fixed.

7. The magnetic field focusing and collecting linear motor without magnetic rail according to any one of claims 1-4, characterized in that: The first silicon steel sheet has a plurality of equidistantly distributed rectangular teeth, and the rectangular teeth of the plurality of first silicon steel sheets form a rectangular tooth pole (41) after being stacked.

8. The magnetic concentrating linear motor without magnetic rail according to claim 7, characterized in that: The extension direction of the rectangular tooth pole (41) is perpendicular to the length direction of the stator (4).

9. The magnetic concentrating linear motor without magnetic rail according to claim 7, characterized in that: The extension direction of the rectangular tooth pole (41) and the length direction of the stator (4) form an angle less than 90°, so that the rectangular tooth pole (41) is inclined to be distributed on the upper end of the stator (4).

10. A magnetic levitation linear motor without magnetic track according to claim 8 or 9, characterized in that: The interval between two adjacent rectangular tooth poles (41) is larger than the interval between two adjacent armature teeth (11), and the width of the armature teeth (11) is larger than the interval between two adjacent rectangular tooth poles (41).

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