Three-rotor linear motor

Abstract

The utility model provides a three-rotor linear motor which comprises a support, a rotor assembly and a stator assembly are arranged in the support, and the rotor assembly is arranged above the stator assembly in a suspended mode and is driven by the stator assembly to move back and forth in a staggered mode. The rotor assembly comprises an inner rotor and outer rotors arranged on the two sides of the inner rotor respectively, an annular frame integrally formed in a die-casting mode is jointly connected between the two outer rotors, the annular frame cannot make contact with the inner rotor when swinging, the annular frame swings along with swinging of the two outer rotors, and therefore it can be guaranteed that the swinging frequencies of the two outer rotors are consistent, and the service life of the two outer rotors is prolonged. The swing accuracy of the inner rotor is improved, the use of parts is greatly reduced, the structure is simplified, and the assembly efficiency is improved; a limiting piece is connected between the inner rotor and any outer rotor, an opening is formed in at least one end of the limiting piece, the inner rotor or the outer rotors are rotationally connected into the opening, impact caused by high-speed swing of the rotors can be reduced, noise is greatly reduced, and the user experience feeling is better.

Description

TECHNICAL FIELD

[0001] The utility model belongs to motor field, concretely relates to a three moving element linear motor. BACKGROUND

[0002] The magnetic suspension swing motor is an advanced motor technology for realizing rotor suspension and swing by using magnetic field principle, and the swing angle and speed of the moving element can be accurately controlled by accurately controlling the magnetic field intensity and direction of the stator, the magnetic suspension swing motor is widely used in electric tools, such as hair clippers, etc. However, compared with the motor with three moving elements, each moving element needs to swing, and the prior art uses the same structure on each moving element, so that the swing of the three moving elements is independent of each other, thereby not only causing too many internal parts of the motor, complex structure, thereby greatly reducing the assembly efficiency, at the same time, too many internal parts also increase the resistance of the moving element in the swing, increase the noise, and affect the accuracy of the moving element swing. SUMMARY

[0003] (1) Technical problem to be solved

[0004] The utility model provides a three moving element linear motor, aims at solving the problem of low assembly efficiency and large noise of the three moving element motor caused by the complex internal structure in the prior art.

[0005] (2) Technical scheme

[0006] The utility model provides a three moving element linear motor, including support, the support is equipped with moving element assembly and stator assembly in, the moving element assembly is suspendedly arranged above the stator assembly and does the interlaced to and fro movement under the drive of the stator assembly, the moving element assembly includes inner moving element and the outer moving element respectively arranged in the both sides of the inner moving element, and the annular frame of integrally pressure die forming is connected between the two outer moving elements, the inner moving element moves to and fro in the annular frame and the direction of movement is opposite with the direction of movement of the annular frame.

[0007] Among them, the inner moving element is connected with any outer moving element with a limiting piece.

[0008] Further, the inner moving element sequentially includes inner swing element and inner magnetic yoke from top to bottom, the inner swing element is equipped with inner swing shaft, and the inner swing shaft sequentially penetrates the inner swing element and the inner magnetic yoke to realize fixed connection with each other.

[0009] Further, the outer moving element includes outer magnetic yoke and outer swing shaft fixedly connected with the annular frame, the outer magnetic yoke is equipped with through hole three, the annular frame is equipped with through hole two, and the outer swing shaft sequentially penetrates the through hole two and the through hole three to realize fixed connection with each other.

[0010] Further, both ends of the limiting piece are provided with the opening, and the outer swing shaft and the inner swing shaft are respectively rotationally connected in the two openings.

[0011] Further, the middle part of the limiting piece is further provided with a limiting rod, one end of the limiting rod is rotationally connected with the limiting piece, and the other end extends upward and is fixedly connected with the support.

[0012] Further, the mover assembly further comprises a magnet group, the magnet group comprises an inner magnet one and an inner magnet two which are respectively fixedly connected with the inner magnetic yoke, and an outer magnet one and an outer magnet two which are respectively fixedly connected with the outer magnetic yoke, the magnetic poles of the inner magnet one and the outer magnet one are opposite, and the magnetic poles of the inner magnet two and the outer magnet two are opposite.

[0013] Further, the inner swing piece is elastically pressed between the inner wall of the annular frame on both sides along the moving direction.

[0014] Further, both sides of the outer mover and the inner mover are provided with elastic sheets, the number of the elastic sheets is two, the elastic sheet comprises an inner elastic plate and an outer elastic plate, the upper end of the inner elastic plate is fixedly connected with the inner mover, the upper end of the outer elastic plate is fixedly connected with the annular frame, and the lower ends of the inner elastic plate and the outer elastic plate are fixedly connected with the support.

[0015] Further, the width L2 of the outer mover is less than or equal to the width L1 of the inner mover.

[0016] Further, the stator assembly comprises an iron core, a coil and a coil holder, the iron core is arranged in a "mountain" shape and is screw-connected with the support on both sides, the coil holder is sleeved on the middle part of the iron core, and the coil is wound on the coil holder.

[0017] Compared with the prior art, the utility model has the advantages that:

[0018] The two outer movers are connected by arranging an annular frame, the annular frame is integrally pressure die formed, swings along with the swing of the two outer movers and does not touch the inner mover, thereby not only can ensure that the swing frequency of the two outer movers is consistent, improves the swing accuracy of the inner mover, greatly reduces the use of parts, simplifies the structure and improves the assembly efficiency, on the other hand, the inner mover is connected with any outer mover by a limiting piece, at least one end of the limiting piece is provided with an opening structure, can reduce the impact caused by the high-speed swing of the mover, greatly reduces the noise and provides better user experience. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the whole structure schematic view of the utility model.

[0020] Figure 2The whole structure explosion map of the utility model.

[0021] Figure 3 The explosion map of the mover assembly of the utility model.

[0022] Figure 4 The structure schematic diagram of the limiting piece of the utility model.

[0023] Figure 5 The overhead view of the whole structure of the utility model.

[0024] Figure 6 The schematic diagram of the inner mover and the outer mover swing of the utility model.

[0025] Figure 7 The structure example diagram of the magnet group magnetic pole of the utility model.

[0026] Figure 8 The schematic diagram of the magnet group swing of the utility model Figure 1 .

[0027] Figure 9 The schematic diagram of the magnet group swing of the utility model Figure 2 .

[0028] Figure 10 The example of the magnetic effect of the mover assembly and the stator assembly of the utility model Figure 1 .

[0029] Figure 11 The example of the magnetic effect of the mover assembly and the stator assembly of the utility model Figure 2 .

[0030] Fig. 1- support, 2- mover assembly, 21- inner mover, 211- inner swing piece, 2111- mounting column, 2112- cylindrical hole one, 212- inner magnetic yoke, 2121- through hole one, 213- inner swing shaft, 22- outer mover, 221- outer magnetic yoke, 2211- through hole three, 222- outer swing shaft, 23- annular frame, 231- cylindrical hole two, 24- magnet group, 241- inner magnet one, 242- inner magnet two, 243- outer magnet one, 244- outer magnet two, 25- elastic piece, 26- protrusion one, 27- protrusion two, 3- stator assembly, 31- iron core, 32- coil, 33- coil frame, 4- limiting piece, 41- opening, 42- limiting rod, 43- through hole two, 5- spring piece, 51- inner spring plate, 52- outer spring plate. DETAILED DESCRIPTION

[0031] The technical schemes in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model.

[0032] As Figures 1-2The utility model provides a kind of three moving son linear motor, including support 1, the support 1 inside is equipped with moving son assembly 2 and stator assembly 3, the moving son assembly 2 is suspended and set in the stator assembly 3 above and does the interlaced to-and-fro movement under the drive of the stator assembly 3;The moving son assembly 2 includes inner moving son 21 and the outer moving son 22 respectively arranged in the both sides of the inner moving son 21, and the annular frame 23 of integrally pressure casting is commonly connected between two the outer moving son 22, the inner moving son 21 moves back and forth in the annular frame 23 and the direction of movement is opposite with the direction of movement of the annular frame 23.In prior art, the motor with three moving sons is usually provided with a swing frame for each moving son, so that the swing of each moving son is independent and not affected, but it will lead to excessive parts used in the whole motor, so that the structure is complex, and it is inconvenient for subsequent disassembly.In the utility model, since the moving direction of the outer moving son 22 located at the both sides of the inner moving son 21 is consistent, the annular frame 23 is arranged to connect the two outer moving son 22, the annular frame 23 is integrally pressure casted, which has higher installation precision, can improve the production qualified rate of the motor, and the reduction of parts can greatly improve the assembly efficiency.In addition, the annular frame 23 is provided with a position avoidance structure around the inner moving son 21, so that the inner moving son 21 will not be interfered by the annular frame 23 during movement in the annular frame 23.

[0033] Further, the inner moving son 21 and any outer moving son 22 are connected with a limiting piece 4, at least one end of the limiting piece 4 is provided with an opening 41, the inner moving son 21 or the outer moving son 22 is rotatably connected in the opening 41, and the part for limiting the swing of the moving son in the prior art is usually provided with a through hole at both ends of the swing limiting piece, so that the inner moving son 21 or the outer moving son 22 is rotatably connected through the through hole, but the inner moving son 21 and the outer moving son 22 will inevitably pull and impact the swing limiting piece when swinging at high speed, thus generating a large noise, and the user experience is poor, so the limiting piece 4 of the utility model is designed as an opening 41 structure, so that the limiting piece 4 has a better elastic coefficient in the direction of movement, so as to absorb the impact of the inner moving son 21 or the outer moving son 22 during movement, to reduce noise, and the limiting piece 4 also has a higher service life.

[0034] Specifically, as Figure 3As shown, the inner mover 21 includes an inner swing member 211 and an inner magnetic yoke 212 from top to bottom. The inner swing member 211 is provided with an inner swing shaft 213, which passes through the inner swing member 211 and the inner magnetic yoke 212 in sequence to achieve a fixed connection between them. The inner swing member 211 has downward-extending "L"-shaped structures on both sides. The inner magnetic yoke 212 is disposed within the "L"-shaped structure and fixedly connected to the inner swing member 211. The inner swing member 211 has a mounting post 2111 in the middle. The mounting post 2111 has a cylindrical hole 2112 penetrating the inner swing member 211. The inner magnetic yoke 212 has a through hole 2121 communicating with the cylindrical hole 2112. The inner swing shaft 213 passes through the cylindrical hole 2112 and is press-fitted to the through hole 2121 of the inner magnetic yoke 212. The connection structure is more stable and firm, and the swing of the inner swing shaft 213 can be directly driven by the inner magnetic yoke 212, resulting in higher swing speed and accuracy.

[0035] Furthermore, the outer mover 22 includes an outer magnetic yoke 221 and an outer swing shaft 222 fixedly connected to the annular frame 23. The outer magnetic yoke 221 is fixed below the annular frame 23 and has a through hole 2211. The annular frame 23 has a cylindrical hole 231 communicating with the through hole 2211. The outer swing shaft 222 passes through the cylindrical hole 231 and the through hole 2211 in sequence and forms an interference connection. Under the action of the electromagnetic field of the stator assembly 3, the outer magnetic yoke 221 drives the outer swing shaft 222 to swing, and at the same time drives the annular frame 23 to swing as a whole. This can further ensure that the swing amplitude of the outer movers 22 located on both sides of the inner mover 21 is consistent, thereby making the swing accuracy of the inner mover 21 higher.

[0036] Furthermore, such as Figures 4-6 As shown, in one embodiment of this utility model, the limiting member 4 has openings 41 at both ends. The outer swing shaft 222 and the inner swing shaft 213 are rotatably connected to the two openings 41 to limit the movement range of the moving part assembly 2. The position of the limiting member 4 corresponds to the position of the outer swing shaft 222. The limiting member 4 is connected to the inner moving part 21 and the outer moving part 22 by the outer swing shaft 222 and the inner swing shaft 213. This also reduces the number of parts used and avoids the use of additional bolts or other parts as connecting parts, making the overall structure of this utility model simpler and more practical.

[0037] Further, the middle part of the limiting piece 4 is also provided with a through hole two 43 and a limiting rod 42, one end of the limiting rod 42 is rotatably connected with the limiting piece 4 through the through hole two 43, the other end extends upward and is fixedly connected with the support 1, so that the limiting piece 4 swings around the limiting rod 42 as the center, realizes the linkage between the inner rotor 21 and the outer rotor 22, and when the inner swing shaft 213 swings to the right, the end of the limiting piece 4 connected with the inner swing shaft 213 also swings to the right, and the other end swings to the left. Since the swing direction of the outer swing shaft 222 is opposite to that of the inner swing shaft 213, the limiting piece 4 has a boosting effect on the outer swing shaft 222 and the annular frame 23.

[0038] Further, as shown in Figure 2 、 Figure 6 The mounting column 2111 of the inner swing piece 211 is provided with a protrusion one 26 on both sides of the moving direction, and the annular frame 23 is provided with a protrusion two 27 on the two inner walls opposite to the protrusion one 26. Each group of opposite protrusion one 26 and protrusion two 27 is elastically pressed with an elastic piece 25. When the inner rotor 21 swings to the right, the elastic piece 25 on the right side is in a compressed state, and the elastic piece 25 on the left side is in a stretched state. Since the elastic piece 25 has a restoring force, the restoring force also has a boosting force on the swing of the inner rotor 21, and the inner swing shaft 213 will not touch the annular frame 23 during the swing process, avoiding noise and improving user experience. In addition, when the driving is stopped, the elastic piece 25 also has the effect of automatically resetting the inner swing shaft 213.

[0039] Further, as shown in Figure 1 、 Figure 2 The outer rotor 22 and the inner rotor 21 are both provided with elastic sheets 5, the number of the elastic sheets 5 is two, the elastic sheet 5 includes an inner elastic plate 51 and an outer elastic plate 52, the outer elastic plate 52 is symmetrically arranged on both sides of the inner elastic plate 51, the upper end of the inner elastic plate 51 is fixedly connected with the inner swing piece 211, the upper end of the outer elastic plate 52 is fixedly connected with the annular frame 23, and the lower ends of the inner elastic plate 51 and the outer elastic plate 52 are integrally connected and fixedly connected with the bottom of the support 1, so that the rotor assembly 2 is suspended above the stator assembly 3. The integrally connected lower end of the elastic sheet 5 is beneficial to the forming of the plate material, simplifies the material control, fixes the relative position of the two and facilitates the assembly and mass production.

[0040] Further, as shown in Figure 2 、 Figures 7-9As shown, the mover assembly 2 further comprises a magnet group 24, which comprises an inner magnet one 241 and an inner magnet two 242 fixedly connected with the inner yoke 212 respectively, and an outer magnet one 243 and an outer magnet two 244 fixedly connected with the outer yoke 221 respectively, the magnetic poles of the inner magnet one 241 and the outer magnet one 243 are opposite, the magnetic poles of the inner magnet two 242 and the outer magnet two 244 are opposite, the magnetic poles of the adjacent ends of the inner magnet one 241 and the inner magnet two 242 are opposite, at a certain moment on the upper end of the inside of the stator assembly 3 after being electrified, a single magnetic field is formed, according to the principle of repulsion and attraction of magnets, the inner magnet one 241 and the inner magnet two 242 will swing to one side, and the outer magnet one 243 and the outer magnet two 244 will swing to the other side, with the change of the direction of alternating current, the magnetic field on the upper end of the stator assembly 3 will also constantly change, thereby realizing the effect of the inner mover 21 and the outer mover 22 constantly and rapidly interlaced swinging.

[0041] Preferably, as Figure 7 As shown, the width L2 of the outer mover 22 is less than or equal to the width L1 of the inner mover 21, because the annular frame 23 is connected between the two outer movers 22, and the annular frame 23 itself has a certain weight, in order to balance the swinging between the inner mover 21 and the outer mover 22 and avoid the situation of transverse torsional vibration due to the weight problem, the width L2 of the outer mover 22 is designed to be less than or equal to 1 / 2 of the width L1 of the inner mover 21, accordingly, the width L2 of the outer magnet one 243 or the outer magnet two 244 is also less than or equal to 1 / 2 of the width L1 of the inner magnet one 241 or the inner magnet two 242, so that the inner mover 21 has more driving force than the outer mover 22, to balance the swinging between the two, so that the user has a better experience.

[0042] Preferably, as Figures 10-11 As shown, the stator assembly 3 comprises a core 31, a coil 32 and a coil frame 33, the core 31 is arranged in a "mountain" shape and is screwed to the two sides of the support 1 respectively, the coil frame 33 is sleeved on the middle part of the core 31, and the coil 32 is wound on the coil frame 33, when the coil 32 is electrified, under the magnetic effect of the current, the coil 32 and the core 31 can jointly form an induced magnetic field, so that the inner yoke 212 and the outer yoke 221 located above the stator assembly 3 make opposite reciprocating movements.

[0043] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the specification is described in this way only for the sake of clarity, and 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 embodiments that those skilled in the art can understand.

[0044] It is obvious to those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, from any point of view, the embodiments should be considered as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be considered as limiting the claims involved.

Claims

1. A three-mover linear motor, characterized by, The application relates to a support (1) which is internally provided with a mover assembly (2) and a stator assembly (3), the mover assembly (2) is suspended above the stator assembly (3) and moves back and forth in an interlaced mode under the drive of the stator assembly (3); the mover assembly (2) comprises an inner mover (21) and outer movers (22) arranged on the two sides of the inner mover (21) respectively, and a ring-shaped frame (23) integrally formed by pressure casting is connected between the two outer movers (22); the inner mover (21) moves back and forth in the ring-shaped frame (23) and the moving direction is opposite to that of the ring-shaped frame (23). A limiting piece (4) is connected between the inner mover (21) and any outer mover (22).

2. The linear motor of claim 1, wherein The inner mover (21) comprises an inner swing piece (211) and an inner magnetic yoke (212) from top to bottom in sequence, an inner swing shaft (213) is arranged on the inner swing piece (211), and the inner swing shaft (213) penetrates the inner swing piece (211) and the inner magnetic yoke (212) to be fixedly connected with each other in sequence.

3. The three-mover linear motor of claim 2, wherein, The outer mover (22) comprises an outer magnetic yoke (221) and an outer swing shaft (222) fixedly connected with the ring-shaped frame (23), a through hole three (2211) is arranged on the outer magnetic yoke (221), a cylindrical hole two (231) is arranged on the ring-shaped frame (23), and the outer swing shaft (222) penetrates the cylindrical hole two (231) and the through hole three (2211) to be fixedly connected with each other in sequence.

4. The three-mover linear motor of claim 3, wherein, Two ends of the limiting piece (4) are provided with openings (41), and the outer swing shaft (222) and the inner swing shaft (213) are rotatably connected in the two openings (41) respectively.

5. The three-mover linear motor of claim 4, wherein, A limiting rod (42) is further arranged on the middle part of the limiting piece (4), one end of the limiting rod (42) is rotatably connected with the limiting piece (4), the other end extends upwards and is fixedly connected with the support (1).

6. The three-mover linear motor of claim 5, wherein, The mover assembly (2) further comprises a magnet group (24), the magnet group (24) comprises an inner magnet one (241) and an inner magnet two (242) fixedly connected with the inner magnetic yoke (212) respectively, and an outer magnet one (243) and an outer magnet two (244) fixedly connected with the outer magnetic yoke (221) respectively, the magnetic poles of the inner magnet one (241) and the outer magnet one (243) are opposite, and the magnetic poles of the inner magnet two (242) and the outer magnet two (244) are opposite.

7. The linear motor of claim 2, wherein, Elastic pieces (25) are elastically pressed between the inner walls of the ring-shaped frame (23) and the two sides of the inner swing piece (211) along the moving direction.

8. The linear motor of claim 1, wherein, The outer mover (22) and the inner mover (21) are both provided with elastic sheets (5), the number of the elastic sheets (5) is two, the elastic sheet (5) comprises an inner elastic plate (51) and an outer elastic plate (52), the upper end of the inner elastic plate (51) is fixedly connected with the inner mover (21), the upper end of the outer elastic plate (52) is fixedly connected with the ring-shaped frame (23), and the lower ends of the inner elastic plate (51) and the outer elastic plate (52) are fixedly connected with the support (1).

9. The linear motor of claim 1, wherein, The width L2 of the outer mover (22) is less than or equal to the width L1 of the inner mover (21).

10. The linear motor of claim 1, wherein The stator assembly (3) comprises a core (31), a coil (32) and a coil holder (33), the core (31) is arranged in a "mountain" shape and is screwed with the support (1) on both sides, the coil holder (33) is sleeved on the middle part of the core (31), and the coil (32) is wound on the coil holder (33).

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