WO2018082508A1

WO2018082508A1 - Permanent magnet linear motor

Info

Publication number: WO2018082508A1
Application number: PCT/CN2017/108126
Authority: WO
Inventors: 黄仲冬; 尹艳辉
Original assignee: 深圳市华一传动技术有限公司
Priority date: 2016-11-02
Filing date: 2017-10-27
Publication date: 2018-05-11
Also published as: CN106374714B; CN106374714A

Abstract

A permanent magnet linear motor (100) comprising a motor housing (10), and a mover assembly and stator assembly mounted in said motor housing (10), the mover assembly being located at an inner side of the stator assembly: the mover assembly comprising a driveshaft (20), a connecting shaft support frame and a permanent magnet (70); the connecting shaft support frame being fixedly connected to the driveshaft (20), and the permanent magnet (70) being inserted in the connecting shaft support frame; the stator assembly comprising a stator iron core (31) fixed to the motor housing (10) and a winding framework (33) fastened to the stator iron core (31), as well as a winding coil wound around the winding framework (33). The present linear motor has a small air-gap magnetic field, tight magnetic circuit and low magnetic leakage, and therefore decreases eddy current losses, increasing effective power and working efficiency of the motor.

Description

Permanent magnet linear motor

Cross-reference to related applications

The present application claims priority to Chinese Patent Application Serial No. WO 201610952533.9, entitled "Permanent Magnet Linear Motor", filed on November 2, 2016, the entire contents of which is incorporated herein by reference.

Technical field

The invention relates to a permanent magnet linear motor.

Background technique

The permanent magnet linear motor is a new type of motor that generates electromagnetic force after the coil winding is energized, and interacts with the permanent magnet magnetic force to drive the motor mover assembly to drive the reciprocating linear motion of the drive shaft. Existing permanent magnet motors usually use inner and outer iron cores to produce a complete magnetic circuit. The presence of inner and outer iron cores increases the air gap between the iron core and the permanent magnet, the iron core and the iron core, so that the motor is bulky, the air gap is large, and the magnetic circuit Incomplete, resulting in magnetic and electromagnetic forces can not fully utilize and leak eddy current losses from the tape to reduce motor power and efficiency.

Summary of the invention

The main object of the present invention is to provide a permanent magnet linear motor, which aims to reduce the air gap between the stator core and the stator core, the air gap between the stator core and the permanent magnet, and facilitate the stator core and the stator core. A complete magnetic circuit is formed between them to increase the effective power and working efficiency of the motor.

To achieve the above object, a permanent magnet linear motor according to the present invention includes a motor housing and a mover assembly and a stator assembly mounted in the motor housing, the mover assembly being located within the stator assembly, wherein: The mover assembly includes a drive shaft, a coupling bracket and a permanent magnet; the coupling bracket is fixedly coupled to the transmission shaft, and the permanent magnet is embedded in the coupling bracket; the stator assembly is fixed on the motor housing and One or more sets of stator cores correspondingly distributed along two poles of the permanent magnet magnetic field, a winding bobbin fastened to the stator core, and a winding coil wound on the bobbin.

Preferably, the coupling bracket is provided with more than one through hole, the through hole extends in the axial direction of the transmission shaft, and the permanent magnet linear motor further comprises one or more guide rails passing through the through hole. The mover assembly linearly reciprocates along the guide rail.

Preferably, the permanent magnet linear motor further includes two end covers respectively covering the two ends of the motor casing, and the guide rails are respectively fixed to the end cover through the rear end of the coupling bracket, and at least the transmission shaft One end passes through the end cap and projects from the motor housing.

Preferably, both ends of the guide rail are sleeved with elastic members.

Preferably, the motor further includes two chucks disposed at two axial ends of the stator core, each of the chucks being located between the end cover and the stator core, each of the chucks Resisting one end of the stator core and the motor One end of the housing is snapped.

Preferably, the permanent magnet is in the form of a flat plate.

Preferably, the stator core includes a core yoke portion, and a side of the core yoke portion facing the coupling bracket is spaced apart from a plurality of core teeth, and the plurality of core teeth are in the The core yoke portions are spaced apart in the longitudinal direction, and the winding coils are wound on the winding bobbin located on the core yoke portion or the core tooth portion.

Preferably, the coupling bracket includes a mounting frame, and the transmission shaft is connected to an end of the mounting frame, and the mounting frame is spaced apart from the axial direction of the permanent magnet linear motor by at least two first mounting openings. The permanent magnet is embedded in a first mounting opening, and the stator core is provided with at least two, and at least two of the stator cores are symmetrically disposed on opposite sides of the mounting frame.

Preferably, the coupling bracket includes a plurality of fixing frames, and the plurality of fixing frames are circumferentially spaced apart from each other of the transmission shaft, and each of the fixing frames is formed with at least two second mounting openings, one The permanent magnet is embedded in a second mounting opening, and the stator core is provided with a plurality of the stator cores circumferentially spaced around the outer side of the mover assembly.

Preferably, the coupling bracket comprises a connecting cylinder and a plurality of transmission arms connected to the outer wall of the connecting cylinder, the connecting cylinder is sleeved outside the transmission shaft, and the plurality of transmission arms are connected to the connecting cylinder The outer wall is radially symmetrically disposed, and the outer end of each of the transmission arms is provided with a third mounting opening, and the permanent magnet is embedded in a third mounting opening, and the stator core is annularly disposed. The mover assembly is located on the inner side of the ring surrounded by the stator core.

The technical solution of the present invention adopts a permanent magnet as a magnetic source in a permanent magnet linear motor, and a permanent magnet is fixed in a shaft bracket in the motor, and a stator core corresponding to the permanent magnet is disposed on the outer side of the mover assembly. The stator cores disposed on the outer side constitute a complete motor magnetic circuit, so that the linear motor has a simple structure, the cost is reduced, and the air gap between the permanent magnet and the stator core can be effectively shortened, and the motor is formed. At the same time, the magnetic circuit is complete, the magnetic circuit has less magnetic leakage, and the eddy current loss is reduced, so that the electromagnetic energy utilization of the motor is high, and the effective power and working efficiency of the motor are improved.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only It is a certain embodiment of the present invention, and those skilled in the art can obtain other drawings according to the structures shown in the drawings without any creative work.

1 is a schematic exploded view of an embodiment of a permanent magnet linear motor according to the present invention;

2 is a schematic exploded view of another embodiment of a permanent magnet linear motor according to the present invention;

3 is a schematic view showing an exploded structure of still another embodiment of the permanent magnet linear motor of the present invention.

Description of the reference numerals:

标号Label	名称 name	标号Label		名称name
100100	永磁直线电机Permanent magnet linear motor	5353	第二安装口 Second mounting port
1010	电机外壳 Motor housing	6262	连接筒Connecting barrel
2020	传动轴 transmission shaft	6464	传动臂 Transmission arm
3131	定子铁芯 Stator core	6666	第三安装口 Third mounting port
311311	铁芯轭部Core yoke	7070	永磁体 Permanent magnets
313313	铁芯齿部 Core tooth	8080	导轨 guide
3333	绕线骨架 Winding skeleton	8282	弹性件 Elastic part
4040	安装框 Installation box	9191	端盖 End cap
4242	第一安装口 First mounting port	911911	轴孔 Shaft hole
5151	固定框Fixed frame	9393	卡盘Chuck

The implementation, functional features, and advantages of the present invention will be further described in conjunction with the embodiments.

detailed description

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that all directional indications (such as up, down, left, right, front, back, ...) in the embodiments of the present invention are only used to explain between components in a certain posture (as shown in the drawing). Relative positional relationship, motion situation, etc., if the specific posture changes, the directional indication also changes accordingly.

In the present invention, the terms "connected", "fixed" and the like should be understood broadly, unless otherwise clearly defined and limited. For example, "fixed" may be a fixed connection, or may be a detachable connection, or may be integrated; It may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and may be an internal connection of two elements or an interaction relationship of two elements unless explicitly defined otherwise. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood on a case-by-case basis.

In addition, the descriptions of "first", "second", and the like in the present invention are used for the purpose of description only, and are not to be construed as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Thus, features defining "first" or "second" may include at least one of the features, either explicitly or implicitly. In addition, the technical solutions between the various embodiments may be combined with each other, but must be based on the realization of those skilled in the art, and when the combination of the technical solutions is contradictory or impossible to implement, it should be considered that the combination of the technical solutions does not exist. It is also within the scope of protection required by the present invention.

The present invention proposes a permanent magnet linear motor 100.

Referring to FIG. 1, in an embodiment of the invention, the permanent magnet linear motor 100 includes a motor housing 10 and a mover assembly (not labeled) and a stator assembly (not labeled) mounted in the motor housing 10, the mover assembly being located in the stator The inside of the component, its Medium: the mover assembly includes a drive shaft 20, a coupling bracket (not labeled), and a permanent magnet 70; the coupling bracket is fixedly coupled to the transmission shaft 20, and the permanent magnet 70 is embedded in the coupling bracket; the stator assembly includes a fixed connection motor housing The stator core 31 of 10 and a winding coil (not shown) wound around the stator core 31.

The motor casing 10 of the present embodiment is made of a metal material, and has a cylindrical shape in which both ends are continuous. That is, the permanent magnet linear motor 100 of the present embodiment is a cylindrical linear motor, wherein the outer end of the drive shaft 20 in the mover assembly is extended from the end of the motor casing 10. Of course, the drive shaft 20 may be extended at one end. The body 10 may also have its ends projecting from the housing 10. The winding bobbin 33 is made of an insulating material and can be produced by integral injection molding. In this embodiment, the winding coil is wound in the longitudinal direction of the winding bobbin 33, that is, in the axial direction of the motor, and the electromagnetic field generated by the winding coil interacts with the magnetic field generated by the permanent magnet 70 in the mover assembly to push or pull the mover. The assembly linearly reciprocates along the axial direction of the motor housing 10.

The set of the present embodiment is referred to as two, and each set of stator cores 31 is radially symmetrically disposed on opposite sides of the mover assembly, so that the mover assembly is evenly stressed during the process of magnetic force pushing, and the motion process Medium is more stable.

The technical solution of the present invention adopts the permanent magnet 70 as a magnetic source in the permanent magnet linear motor 100, and the permanent magnet 70 is fixed by providing a coupling bracket in the motor, and the outer side of the mover assembly is disposed corresponding to the permanent magnet 70. The stator core 31 allows the stator cores 31 disposed on the outer side to form a complete motor magnetic circuit, so that the linear motor has a simple structure and a reduced cost, and the air gap between the permanent magnet and the stator core 31 can also be Effectively shortened, the magnetic circuit formed in the motor is complete, and the magnetic circuit has less magnetic leakage. After reducing the eddy current loss, the electromagnetic energy utilization of the motor is high, and the effective power and working efficiency of the motor are improved.

The stator core 31 in the stator assembly may be formed by press-stacking a plurality of sheets of silicon steel sheets, and the coil windings are wound around the stator core 31 in the circumferential direction of the motor casing 10. The permanent magnet 70 in the mover assembly has a flat plate shape, and the permanent magnet 70 is arranged in one or more layers in the axial direction of the motor, and the plurality of permanent magnets 70 are arranged in the axial direction of the motor, as shown in FIG. The magnet 70 is of two layers. Of course, the number of layers of the permanent magnet 70 can also be increased or decreased according to the power of the motor, the size of the motor, and the motor mover stroke. The motor forms a plurality of magnetic fields through the multilayer permanent magnet 70, and the plurality of magnetic fields pass through the poles of the stator core 31. The generated magnetic force interacts to push and pull the mover assembly to realize linear reciprocating motion of the drive shaft 20 of the motor. Thus, the permanent magnet linear motor 100 has a simple structure and high work efficiency.

It should be noted that the basic structure and principle of the motor constructed by using one or more sets of stator cores 31 correspondingly distributed along the magnetic poles of the flat plate permanent magnets 70 are within the protection scope of the patent.

Referring to FIG. 1 again, the coupling bracket of the present embodiment includes a mounting frame 40, and the transmission shaft 20 is connected to the end of the mounting frame 40. The mounting frame 40 is spaced apart from the axial direction of the permanent magnet linear motor 100 by at least two a mounting port 42 in which a permanent magnet 70 is embedded in a first mounting opening 42. The stator core 31 is provided with multiples of two or two, and two or two multiples of the stator core 31 are symmetrically disposed on The opposite sides of the mounting frame 40. Specifically, the stator core 31 includes a core yoke portion 311, and a side of the core yoke portion 311 facing the coupling bracket is spaced apart from each other with a plurality of core teeth portions 313, and the plurality of the core teeth portions 313 are at the core yoke The portions 311 are spaced apart in the longitudinal direction, and the bobbin 33 is fastened to the stator core 31 and has a core On one side of the tooth portion 313, the winding coil is wound around a portion of the bobbin 33 on the core yoke portion 311 or the core tooth portion 311. In the present embodiment, the stator core 31 is formed in a substantially E-shape or a curved shape by the arrangement of the core tooth portion 313 and the core yoke portion 311. Of course, in the case where the core tooth portion 313 is large, The stator core 31 may also be a multi-stage E-shaped structure, and the winding bobbin 33 has a structure adapted to the stator core 31, so that the assembly process of the stator core 31 and the winding bobbin 33 is simple, and the connection between the two is simple. The structure is stable, and the winding coil is also conveniently mounted on the winding bobbin 33, and the connecting structure is also relatively stable.

The first mounting opening 42 in the mover assembly shown in FIG. 1 is disposed side by side in the axial direction of the motor, and the permanent magnet 70 is also provided corresponding to the first mounting opening 42. Of course, one of the permanent magnets 70 can also be provided. The transmission shaft 20 and the mounting frame 40 can be formed by integral die casting, that is, the transmission shaft 20 and the coupling bracket of the mover assembly of the present invention can be an integral structure. The mounting frame 40 has a rectangular parallelepiped shape, and the transmission shaft 20 is located on the central axis of the longitudinal direction of the mounting frame 40. The permanent magnet 70 can be fixedly connected to the mounting frame 40 by gluing or welding to form a whole body, and the central axis of the permanent magnet 70 Coincident with the central axis in the longitudinal direction of the mounting frame 40, the two stator cores 31 are disposed approximately parallel to the permanent magnets 70, so that the air gap between the stator assembly and the mover assembly can be reduced, and the overall structure of the linear motor is simple. The efficiency of the motor is also high.

Further, the coupling bracket is provided with more than one through hole extending in the axial direction of the transmission shaft 20, and the permanent magnet linear motor 100 of the present invention further comprises one or more guide rails 80 passing through the through hole, the moving subassembly Linearly reciprocating along the guide rail 80.

The through hole of the embodiment is formed on the long side of the mounting frame 40 extending in the axial direction of the motor, and the through hole is disposed on both sides of the transmission shaft 20, that is, the guide rail 80 is also provided with two correspondingly, and the guide rail 80 is The long cross-section has a circular cross section and a smooth surface, and both ends of the guide rail 80 are fixed. Through the arrangement of the guide rails 80, the air gap of the stator assembly and the mover assembly can be further effectively reduced, so that the magnetic flux utilization rate of the motor is improved, the efficiency of the motor is improved, and at the same time, in the case where the air gap is small, the guide rail 80 is passed. Guide function, in the motor running process, the stator assembly and the mover assembly are also less prone to sweeping, and the motor has higher running stability.

The permanent magnet linear motor 100 of the present invention further includes two end caps 91 respectively covering the two ends of the motor casing 10. The guide rails 80 are respectively fixed to the end cover 91 through the rear end of the coupling bracket, and the ends of the transmission shaft 20 are worn. The end cap 91 is extended by the motor housing 10. The end cover 91 has a plate-like structure, and a shaft hole 911 is defined in the middle portion. The end of the transmission shaft 20 protrudes from the motor housing 10 by the shaft hole 911. The two end covers 91 also fix the two ends of the guide rail 80. The end cover 91 and the motor housing 10 may be riveted or snap-fitted, and a closed space is formed in the motor housing 10 by the cooperation of the two end covers 91 and the motor housing 10.

Further, in this embodiment, elastic members 82 are sleeved on both ends of each of the guide rails 80. The elastic member 82 is preferably a spring, and the elastic member may also be a silicone rubber pad. The elastic recovery capability of the elastic member 82 enables the mover assembly to prevent the mover assembly from moving closer to the end cover 91 during linear reciprocating motion. Will not violently hit the end cap 91. On the other hand, the mover component rebounds more quickly in the opposite direction, which improves the reliability and sensitivity of the motor running process, and the work efficiency is also improved.

The stator assembly further includes two chucks 93 disposed at two axial ends of the stator core 31. Each of the chucks 93 is located between the end cover 91 and the stator core 31, and each of the chucks 93 abuts the stator iron. The end of the core 31 is engaged with the motor housing 10.

The edge of the chuck 93 is provided with a buckle, and the casing wall of the motor casing 10 is provided with a card slot, and the chuck 93 is engaged with the motor casing 10. In this embodiment, the chuck 93 is annular. After the stator core 31 and the winding coil and the mover assembly of the stator set are mounted in the motor casing 10, the two chucks 93 are respectively driven by the motor ends. By snapping in, the fixed positioning of the stator core 31 in the motor casing 10 and the guiding position of the guide rail or the transmission shaft 20 in the mover assembly can be prevented, and the stator assembly can be prevented from loosening in the motor casing 10 during the operation of the motor. And the assembly process of the motor is also convenient.

Referring to FIG. 2, in the second embodiment of the present permanent magnet linear motor 100, the stator assembly has a plurality of fixed frames on the basis that the stator assembly has the same E-shaped stator core 31 as the first embodiment. 51. A plurality of fixing frames 51 are connected to the peripheral wall of the transmission shaft 20, and a plurality of fixing frames 51 are circumferentially spaced around the transmission shaft 20 to form a substantially fan-shaped substantially fan blade structure, and each fixing frame 51 is formed with at least two. A second mounting port 53 is embedded in a second mounting opening 53. The stator core 31 is provided with a plurality of stator cores 31 circumferentially spaced around the outer side of the mover assembly. Settings. In the present embodiment, the number of the stator cores 31 is twice the number of the fixed frames 51. The arrangement of the plurality of stator cores 31 enables the motor to output more power.

The chuck 93 of the present embodiment has a disk shape, and a through hole for the guide rail 80 and the transmission shaft 20 is opened in the middle of the chuck 93. The chuck 93 and the end cover 91 are also locked by a screw connection.

Referring to FIG. 3, in a third embodiment of the present permanent magnet linear motor 100, the coupling bracket includes a connecting cylinder 62 and a plurality of transmission arms 64 connected to the outer wall of the connecting cylinder 62. The connecting cylinder 62 is connected to the transmission shaft. 20, the plurality of transmission arms 64 are radially symmetrically disposed on the outer wall of the connecting cylinder 62, and the outer end of each of the transmission arms 64 is provided with a third mounting opening 66, and the permanent magnet 70 is embedded in the outer casing 70. In the third mounting opening 66, the stator core 31 is annularly disposed, and the mover assembly is located on the inner side of the ring surrounded by the stator core 31. The stator core 31 of the present embodiment is formed by superposing two upper and lower stator cores 31, and the outer circumference of the stator core 31 is buckled with an annular winding bobbin to wind the winding coil. In this embodiment, the stator core 31 is annularly disposed. After the winding coils in the stator assembly are electrically connected, the upper and lower reverse electromagnetic fields are formed in the axial direction of the motor to push or pull the mover assembly along the axis of the motor casing 10. Reciprocating linearly. The force component is evenly distributed during the operation of the action component, and the operation is relatively stable, and the output power of the motor is relatively stable.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structural transformation, or direct/indirect use, of the present invention and the contents of the drawings are used in the inventive concept of the present invention. It is included in the scope of the patent protection of the present invention in other related technical fields.

Claims

A permanent magnet linear motor, comprising: a motor housing; and a mover assembly and a stator assembly mounted in the motor housing, the mover assembly being located in the stator assembly, wherein:

The mover assembly includes a drive shaft, a coupling bracket and a permanent magnet; the coupling bracket is fixedly coupled to the transmission shaft, and the permanent magnet is embedded in the coupling bracket;

The stator assembly includes one or more sets of stator cores fixed to the motor casing and correspondingly distributed along two poles of the permanent magnet magnetic field, a winding bobbin fastened on the stator core, and wound on the winding bobbin Winding coil.
A permanent magnet linear motor according to claim 1, wherein said coupling bracket is provided with more than one through hole, said through hole extending in the axial direction of said transmission shaft, said permanent magnet linear motor further comprising Through the one or more guide rails of the through hole, the mover assembly linearly reciprocates along the guide rail.
The permanent magnet linear motor according to claim 2, wherein the permanent magnet linear motor further comprises two end caps respectively covering the two ends of the motor casing, and the guide rails pass through the rear axle brackets respectively Fixed to the end cap, at least one end of the drive shaft passes through the end cap and protrudes from the motor housing.
The permanent magnet linear motor according to claim 2, wherein both ends of the guide rail are sleeved with elastic members.
A permanent magnet linear motor according to claim 3, wherein said permanent magnet linear motor further comprises two chucks disposed at both axial ends of said stator core, each of said chucks being located at said end Between the cover and the stator core, each of the chucks abuts one end of the stator core and is engaged with one end of the motor casing.
A permanent magnet linear motor according to claim 1, wherein said permanent magnet has a flat plate shape.
A permanent magnet linear motor according to claim 1, wherein said stator core includes a core yoke portion, and said iron core yoke portion is provided with a plurality of core teeth spaced apart from a side facing said coupling bracket a plurality of the core teeth portions are spaced apart from each other in a longitudinal direction of the core yoke portion, the winding bobbin being fastened to a side of the stator core having a core tooth portion, the winding coil winding A portion where the bobbin is located on the core yoke portion or the core tooth portion.
The permanent magnet linear motor according to any one of claims 1 to 7, wherein the coupling bracket includes a mounting frame, and the transmission shaft is coupled to an end of the mounting frame, and the mounting frame is The permanent magnet linear motor is axially spaced apart from at least two first mounting openings, one of the permanent magnets is embedded in the first mounting opening, and the stator core is provided with at least two, at least two The stator cores are symmetrically disposed on opposite sides of the mounting frame.
The permanent magnet linear motor according to any one of claims 1 to 7, wherein the coupling bracket includes a plurality of fixing frames, and the plurality of fixing frames are circumferentially spaced around the transmission shaft. Each of the fixing frames is formed with at least two second mounting openings, and the permanent magnets are embedded in a second mounting opening, the stator The iron core is provided in plurality, and a plurality of the stator cores are circumferentially spaced apart from each other at an outer side of the mover assembly.
The permanent magnet linear motor according to any one of claims 1 to 6, wherein the coupling bracket includes a connecting cylinder and a plurality of transmission arms connected to an outer wall of the connecting cylinder, the connecting sleeve is sleeved Outside the drive shaft, a plurality of the transmission arms are radially symmetrically disposed on an outer wall of the connecting barrel, and an outer end of each of the transmission arms is provided with a third mounting port, and the permanent magnet is embedded in In a third mounting port, the stator core is annularly disposed, and the mover assembly is located on an inner side of the ring surrounded by the stator core.