CN219041602U - Linear motor - Google Patents

Abstract

The utility model discloses a linear motor, comprising: the stator, the rotor, the heat dissipation piece and the plastic sealing layer rotor comprise an iron core and a plurality of windings, the iron core comprises a yoke part and a plurality of tooth parts, the windings are wound on the tooth parts, and part of the windings protrude out of the side face of the iron core; the heat dissipation piece comprises a heat dissipation main body and a flat plate part, wherein the heat dissipation main body is positioned at one side of the yoke part, and the flat plate part is positioned at one side of the winding; the plastic layer is filled between the heat dissipation piece and the winding; two opposite sides of the iron core are respectively provided with a heat dissipation piece, the heat dissipation piece further comprises an end plate part, the end plate part covers the end face of the iron core, and the two heat dissipation pieces are abutted to each other, so that the two heat dissipation pieces are surrounded to form a box body with an opening for accommodating the rotor. The heat dissipation parts are contacted with the windings through the plastic sealing layers, heat caused by copper loss of the windings can be transferred to the outside of the rotor and dissipated, the two heat dissipation parts are encircled to form a box body and serve as a part of the packaging jig, and manufacturing cost is reduced while heat dissipation of the rotor is improved.

Description

Linear motor

Technical Field

The utility model relates to the technical field of motors, in particular to a linear motor.

Background

In the related art, the linear motor comprises a rotor and a stator, wherein the stator comprises a magnet, the stator is fixed, the rotor comprises an iron core and a winding, and the rotor moves linearly relative to the stator. The cooling technology of the linear motor mainly comprises two modes of water cooling and air cooling, the cooling effect of the water cooling is large, but the linear motor of the motor is complex in structure and moves together due to dragging of a cooling water pipe and the like, so that the problems of moving stability and safety of a rotor and the like exist. The cooling effect of air cooling is not as good as that of water cooling, but the linear motor structure is relatively simple, and the rotor is easy to manufacture and stable in motion. In order to improve heat dissipation efficiency, the related art is provided with a heat dissipation structure between a mover and a mover chassis, wherein the mover chassis is a part connecting the mover and a load. However, this has added new problems such as high manufacturing cost, large occupied space, complicated structure, and increased weight of the mover.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the linear motor which has the advantages of good air cooling effect, small occupied space, simple manufacture and low manufacturing cost.

According to an embodiment of the present utility model, a linear motor includes: the stator is provided with a plurality of permanent magnets which are arranged in a straight line along the length direction of the linear motor; the rotor is arranged in a sliding manner relative to the stator, the rotor comprises an iron core and a plurality of windings, the iron core comprises a yoke part and a plurality of tooth parts, the tooth parts are connected with the yoke part and are arranged facing the stator, and the windings are wound on the tooth parts and part of the windings protrude out of the side face of the iron core; the heat dissipation piece comprises a heat dissipation main body and a flat plate part, wherein the heat dissipation main body is positioned on one side of the yoke part, and the flat plate part is positioned on one side of the winding; the plastic layer is filled between the heat dissipation piece and the winding; the two opposite side surfaces of the iron core are respectively provided with one heat dissipation piece along the direction of the winding protruding out of the iron core, the heat dissipation pieces further comprise end plate parts, the end plate parts cover the end surface of the iron core along the moving direction of the rotor, and the two heat dissipation pieces are abutted to each other, so that the two heat dissipation pieces are surrounded to form a box body with an opening for accommodating the rotor.

The linear motor provided by the embodiment of the utility model has at least the following beneficial effects: the heat dissipation piece is contacted with the winding through the plastic sealing layer, heat caused by copper loss of the winding can be transferred to the outside of the rotor and dissipated, the side face of the winding is completely covered by the heat dissipation piece, and the air cooling effect can be improved. And two heat dissipation parts are surrounded to form a part of the box body with the opening and the packaging jig, so that the heat dissipation of the rotor is improved, and the manufacturing cost is reduced.

According to some embodiments of the utility model, the outer surface of the heat dissipation piece is provided with a plurality of heat dissipation ribs arranged at intervals, and the extending direction of the heat dissipation ribs is consistent with the length direction of the linear motor.

According to some embodiments of the utility model, the linear motor further comprises an insulating framework, the winding is wound on the insulating framework, the heat dissipation piece is in contact with the insulating framework, and a gap is formed between the heat dissipation piece and the winding.

According to some embodiments of the utility model, the material of the plastic layer is BMC.

According to some embodiments of the utility model, the heat dissipation element further comprises a plurality of heat dissipation teeth connected with the heat dissipation main body, the plurality of heat dissipation teeth and the plurality of windings are arranged at intervals, the heat dissipation teeth are divided into a middle tooth and two end teeth, the middle tooth is located between the two end teeth, the middle tooth is located between two adjacent windings, and the end teeth are located between the end face of the iron core and the windings.

According to some embodiments of the utility model, three sides of the flat plate part are respectively connected with the heat dissipation main body and the two end teeth, the heat dissipation main body is contacted with the end teeth and the side face of the iron core, and the middle teeth are arranged on the flat plate part.

According to some embodiments of the utility model, a hollow groove is formed in a side of the heat dissipation body facing the iron core, and the hollow groove is used for accommodating an energizing wire or connecting wire of the winding.

According to some embodiments of the utility model, at least one side wall surface of the hollow groove is an arc surface.

According to some embodiments of the utility model, the length of the flat plate portion is greater than the length of the end teeth in a direction away from the heat dissipating body.

According to some embodiments of the utility model, the end teeth are provided with first protrusions, the iron core is provided with first positioning holes, and the first protrusions are inserted into the first positioning holes.

According to some embodiments of the utility model, the side of the end tooth facing away from the winding is provided with a wind guiding surface.

According to some embodiments of the utility model, the windings are provided outside each of the teeth.

According to some embodiments of the utility model, only one of the two adjacent teeth is provided with the winding; the middle teeth are in contact with the iron core and are provided with second protrusions, the iron core is provided with second positioning holes, and the second protrusions are inserted into the second positioning holes.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic diagram of a linear motor according to an embodiment of the present utility model;

fig. 2 is a schematic view of one direction of the mover shown in fig. 1;

FIG. 3 is a schematic view of another orientation of the mover shown in FIG. 1;

FIG. 4 is a schematic view of a heat sink of the embodiment shown in FIG. 2;

FIG. 5 is a schematic view of a heat sink according to another embodiment shown in FIG. 2;

FIG. 6 is a schematic diagram of a mover according to another embodiment of the present utility model;

FIG. 7 is a schematic view of the heat sink shown in FIG. 6;

FIG. 8 is a schematic diagram of a potting injection molding process of the mover shown in FIG. 6;

FIG. 9 is a schematic diagram of a linear motor according to another embodiment of the present utility model;

FIG. 10 is a schematic view of the mover shown in FIG. 9;

FIG. 11 is a schematic view of a heat sink of the embodiment shown in FIG. 10;

fig. 12 is a schematic view of a heat sink according to another embodiment shown in fig. 10.

Reference numerals:

101. a mover; 102. a stator; 103. a fixing plate; 104. a magnet; 105. an iron core; 106. a winding; 107. an insulating skeleton; 108. a heat sink; 109. a plastic sealing layer;

201. a hollow groove; 202. a flat plate portion; 203. radiating ribs; 204. a heat dissipating body; 205. a first positioning hole; 206. a yoke;

301. a tooth portion; 302. an arc-shaped portion; 303. a middle tooth;

401. a first protrusion; 402. end teeth;

501. an air guiding surface; 502. an arc surface;

601. an end plate portion;

801. a tooling cover plate; 802. an injection molding port; 803. a concave portion;

1101. and a second protrusion.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

In the related art, a linear motor includes a mover and a stator, and the mover moves linearly along an arrangement direction of the stator. The movable element is supported by a supporting mechanism such as a linear guide rail, the movable element bottom plate is connected with the movable element and the load, and the movable element bottom plate is connected with a sliding block of the linear guide rail. I.e. the mover bottom plate is a component that ensures that the mover and stator maintain the required clearance and maintain normal movement. The stator comprises a fixed plate and a plurality of magnets (i.e. permanent magnets) adhered on the fixed plate, and the magnets are arranged in a straight line along the length direction of the linear motor. The rotor comprises an iron core, a winding, an insulating framework and a plastic sealing layer, wherein the iron core comprises a tooth part, the tooth part is inserted into a through hole of the winding, the winding is sleeved on the insulating framework, and the plastic sealing layer is made of plastic sealing materials and is used for encapsulating the winding and a part of the iron core adjacent to the winding. The main purpose of plastic package is waterproof, prevents short circuit, protects linear motor, maintains life cycle's stability.

The cooling technology of the linear motor mainly comprises two modes of water cooling and air cooling, wherein water is used as a cooling medium, the cooling effect is good, the noise is small, but special cooling components are needed, the structure is complex, and the maintenance is difficult. Air cooling is cooling by wind (flowing air). The air cooling mode is adopted to cool the linear motor, and the linear motor has the advantages of simple structure, low cost, convenient maintenance, stable and reliable operation, small volume and the like, but has obvious defects, and mainly has low cooling effect.

In the air cooling scheme, in order to improve the cooling effect, in the related art, a heat absorption and heat dissipation spacer is arranged between a rotor and a rotor bottom plate, so that the heat dissipation efficiency is improved, but the manufacturing cost is high and the duty ratio is large. Some schemes are provided with a heat dissipation device between the rotor and the rotor bottom plate, the structure of the device is complex, the weight of the rotor can be increased, and the improved cooling effect is not obvious. Some schemes only set arc-shaped cooling fins at the corners of the rotor core, and the cooling effect is limited although the occupied space is reduced.

Next, with reference to fig. 1 to 12, how the linear motor according to the embodiment of the present utility model solves the above-described problems will be described.

Referring to fig. 1, it can be understood that fig. 1 is a schematic diagram of a linear motor (with a part of a plastic envelope 109 and a part of a heat sink 108 cut away) according to an embodiment of the present utility model, and the linear motor includes a mover 101 and a stator 102. The stator 102 includes a fixing plate 103 and magnets 104, the fixing plate 103 is arranged in a left-right direction, the magnets 104 are fixed on the fixing plate 103, for example, the magnets 104 may be adhered to the fixing plate 103, and the magnets 104 may be connected to the fixing plate 103 through a fastening structure. The mover 101 is located above the stator 102, and the mover 101 is capable of rectilinear motion in the left-right direction. The mover 101 includes an iron core 105, a plurality of windings 106, and an insulating bobbin 107, and the width of the iron core 105 in the front-rear direction substantially matches the width of the magnet 104 in the front-rear direction. The linear motor further comprises two heat dissipation elements 108 and a plastic sealing layer 109, wherein the two heat dissipation elements 108 are respectively positioned on the front side and the rear side.

Referring to fig. 3, it may be understood that the iron core 105 includes a plurality of teeth 301, each tooth 301 is disposed downward, each tooth 301 is inserted into a through hole of one winding 106, the winding 106 is sleeved on the insulating frame 107, so as to avoid a short circuit of the winding 106, the plastic sealing layer 109 is made of a plastic sealing material, the plastic sealing material wraps the winding 106 exposed outside the iron core 105 and a part of the iron core 105 adjacent to the winding 106 in a glue filling manner, and the heat dissipation element 108 is located outside the plastic sealing layer 109, that is, the plastic sealing layer 109 can fill a gap between the iron core 105 and the heat dissipation element 108, and a gap between the winding 106 and the heat dissipation element 108, so that the heat dissipation element 108 can absorb and dissipate heat caused by copper loss of the winding 106 coil to the maximum extent. The movement of the mover 101 causes the air to flow through the heat sink 108, so that the air can pass through the heat sink 108 and carry away the heat on the heat sink 108 to dissipate the heat, thereby improving the heat dissipation effect of the linear motor.

It can be appreciated that each tooth 301 is inserted into a through hole of one winding 106, that is, one winding 106 is arranged outside each tooth 301, and the scheme has the advantages of short copper loss at the coil end of the winding 106 and high thrust density.

As can be appreciated from the illustration of fig. 2, the heat sink 108 is shaped like a rectangular parallelepiped, and the heat sink 108 includes a plurality of intermediate teeth 303, two end teeth 402, and a flat plate portion 202, the plurality of intermediate teeth 303 being provided on a side of the flat plate portion 202 near the core 105, for example, the plurality of intermediate teeth 303 being provided on a rear side of the flat plate portion 202. Along the moving direction of the mover 101, two end teeth 402 are respectively located at two ends of the plate portion 202, that is, two end teeth 402 are respectively located at left and right ends of the plate portion 202. The plurality of intermediate teeth 303 and the two end teeth 402 are arranged in the left-right direction, and the plurality of intermediate teeth 303 are located between the two end teeth 402, each intermediate tooth 303 is located between the adjacent two windings 106, each end tooth 402 is located outside the windings 106, one end tooth 402 is located at the leftmost side of the windings 106, and the other end tooth 402 is located at the rightmost side of the windings 106, i.e., only one side of the end tooth 402 is adjacent to the windings 106, and the other side is free of the windings 106. The flat plate portion 202 is not in contact with the core 105, the flat plate portion 202 is located on the front side of the winding 106, and the flat plate portion 202 is not in contact with the winding 106, preventing a short circuit. The flat plate portion 202 and all the windings 106 are projected to a vertical plane along the front-rear direction, the flat plate portion 202 can cover all the windings 106 in the left-right direction, the whole heat dissipation member 108 can cover the side surfaces of the front end and the rear end of the windings 106, and the length of the heat dissipation member 108 is basically equal to the length of the iron core 105, so that the heat dissipation area of the heat dissipation member 108 is large, and the heat dissipation efficiency is high.

It will be appreciated that there is a gap between the heat sink 108 and the windings 106.

As can be understood from fig. 3, since the winding 106 is wound around the tooth 301 of the core 105, the winding 106 protrudes from the front and rear sides of the core 105 in the front and rear directions, so that there is a rugged gap on the front and rear sides of the mover 101, for example, a height difference exists between the front side of the left end of the core 105 and the front side of the winding 106, and a gap exists between the arc sections 302 of two adjacent windings 106. The middle teeth 303 and the end teeth 402 of the heat dissipation element 108 are just filled in the gap, so that the space is fully utilized, the whole occupied space of the linear motor is small, and the heat dissipation element 108 has the advantages of simple structure, simple manufacture and low manufacture cost.

Note that, since part of the molding layer 109 is hidden in the heat sink 108, it is not clearly distinguished in the drawing, and only the molding layer 109 on the outer layer of the heat sink 108 is shown in the drawing.

Referring to fig. 3, it can be appreciated that the side of the heat sink 108 facing away from the core 105 is provided with a plurality of heat dissipating ribs 203 disposed at intervals. By providing the heat radiation ribs 203, the surface area of the heat radiation member 108 can be increased, thereby increasing the heat radiation area and improving the heat radiation efficiency.

It is understood that the molding material of the molding layer 109 may be BMC. Wherein BMC is the acronym of English Bulk Molding Compound, and Chinese name is bulk molding compound. BMC is a mould pressing intermediate material for manufacturing glass fiber reinforced thermosetting products by a semi-dry method, which is prepared by pre-mixing unsaturated polyester resin, low-shrinkage/low-profile additive, initiator, internal release agent, mineral filler and the like into paste, adding thickener, colorant and the like, stirring with glass fibers with different lengths in a special material kettle, and carrying out thickening process to finally form a bulk intermediate material which can be used for mould pressing and injection molding. BMC has advantages such as ease of use, low cost, stable material, and thermal expansion coefficient similar to aluminum, but has a disadvantage of low strength of the molded body due to lack of adhesion. Through setting up middle tooth 303, can make the joint strength of heat abstractor 108 and plastic envelope 109, the integration of embedment plastic can be strengthened to heat abstractor 108 promptly to realize the high strength and the high stability of active cell 101.

Referring to fig. 3 to 5, it will be appreciated that the heat sink 108 includes a heat sink body 204, the core 105 includes a yoke 206, the yoke 206 is located at an end of the teeth 301 away from the stator 102, the yoke 206 is connected to the teeth 301, and the heat sink body 204 is located at a front side of the yoke 206. In other words, the heat dissipation body 204 is located on the side of the winding 106 facing away from the magnet 104, the heat dissipation body 204 is arranged in the left-right direction, and the heat dissipation body 204 connects the flat plate portion 202 and the two end teeth 402. By providing the heat dissipating body 204, the heat dissipating area of the heat dissipating member 108 is increased, and the overall strength of the heat dissipating member 108 can be enhanced.

It is understood that the two heat dissipation members 108 are respectively in contact with the front and rear sides of the core 105, and can absorb and dissipate heat of the core 105. The side of the heat dissipating body 204 facing the core 105 may be in contact with the side of the core 105, the side of the end tooth 402 facing the core 105 may be in contact with the side of the core 105, or the side of the heat dissipating body 204 and the end tooth 402 facing the core 105 may be in contact with the side of the core 105.

Referring to fig. 2 and 3, it can be understood that the side of the heat dissipating body 204 facing the core 105 and the end teeth 402 are simultaneously contacted with the side of the core 105, and the lower side of the heat dissipating body 204 is contacted with the insulating frame 107, so that the heat of the winding 106 is transferred to the heat dissipating member 108 through the insulating frame 107, which is convenient for the heat dissipating member 108 to better take away the heat of the winding 106, and the heat dissipating efficiency is improved.

Referring to fig. 3, it can be understood that the width of the intermediate tooth 303 in the left-right direction is narrower than the gap between the adjacent two windings 106 so that the intermediate tooth 303 maintains a proper spacing from the windings 106. The material of the heat sink 108 is typically selected to be a thermally conductive and lightweight material, such as an aluminum alloy. When the material of the heat sink 108 is a metal material such as an aluminum alloy, if the heat sink 108 is in direct contact with the winding 106, a short circuit is easily caused. While the intermediate teeth 303 are spaced from the windings 106 to avoid shorting. The space between the intermediate teeth 303 and the windings 106 is filled with the plastic layer 109, so that the intermediate teeth 303 and the windings 106 are in indirect contact through the plastic layer 109, and heat of the windings 106 is transferred to the intermediate teeth 303 through the plastic layer 109 and emitted. For example, the gap between the intermediate tooth 303 and the winding 106 is in the range of 0.5 to 1mm, so that insulation can be ensured and heat absorption and heat dissipation can be maximized.

Referring to fig. 3, it can be understood that in a path where the winding 106 is wound from the left side or the right side to the front side or the rear side, there is an arc portion 302, and the arc portion 302 serves as a transition section connecting straight line sections in both the left-right direction and the front-rear direction of the winding 106. Among the adjacent two windings 106, there is a gap whose width is gradually changed in the front-rear direction, that is, the distance between the arc-shaped portions 302 of the adjacent two windings 106 is gradually changed, specifically, the width of the gap is gradually increased in a direction away from the core 105. Correspondingly, the width of the intermediate teeth 303 gradually increases in a direction away from the core 105. For example, the middle teeth 303 are in an inverted triangle shape, so that the end close to the winding 106 is narrow, and the end far from the winding 106 is wide, thereby realizing the equidistant left and right directions of the middle teeth 303 and the end of the two windings 106, and achieving the purposes of fully utilizing the space and improving the heat dissipation effect.

Referring to fig. 3 to 5, it can be understood that since the middle teeth 303 are limited by the space in which they are located, the width of the middle teeth 303 is small in the left-right direction, and the width of the end teeth 402 can be larger than the maximum width of the middle teeth 303, so that the heat dissipation area can be increased and the heat dissipation effect can be enhanced. Also in the front-rear direction, the intermediate teeth 303 are made smaller in thickness in order to maintain the distance from the windings 106, so that the intermediate teeth 303 are farther from the core 105. While the end teeth 402 may contact the core 105 such that the thickness of the end teeth 402 is greater than the thickness of the intermediate teeth 303. In addition, the width of the magnet 104 is substantially the same as the width of the core 105, and since the end teeth 402 contact the core 105, in order to avoid eddy currents generated by the bottom of the end teeth 402 being too close to the magnet 104, the length of the end teeth 402 is short in the up-down direction, so that the bottom of the end teeth 402 is kept at a distance from the magnet 104. While the intermediate teeth 303 are outside the windings 106 and are entirely away from the magnets 104, no eddy currents are generated, so that the length of the intermediate teeth 303 may be longer than the length of the end teeth 402, i.e. the length of the flat plate portion 202 may be longer than the length of the end teeth 402.

As can be appreciated by referring to fig. 4, the end teeth 402 are provided with first protrusions 401, and correspondingly, referring to fig. 3, the core 105 is provided with first positioning holes 205, and the first protrusions 401 are inserted into the first positioning holes 205, so that the heat sink 108 is conveniently fixed and positioned to the core 105. By the cooperation of the first protrusion 401 and the first positioning hole 205, the heat sink 108 is kept at a predetermined position, and the problem of offset of the heat sink 108 during glue filling is prevented.

It should be noted that, in other embodiments, the heat dissipating member 108 may be adhered to the core 105, so as to fix the heat dissipating member 108 to the core 105.

Referring to fig. 4, it can be understood that the heat dissipation body 204 is provided with a hollow groove 201, the hollow groove 201 is located at a side of the heat dissipation body 204 facing the core 105, the hollow groove 201 is arranged along an arrangement direction of the teeth 301, that is, the hollow groove 201 is arranged along a left-right direction, the hollow groove 201 is used for accommodating an energizing wire or a connecting wire of the winding 106, and one plane of the hollow groove 201 is insulated from and contacts with a coil end of the winding 106. In other words, the hollow groove 201 functions as a wiring cavity, and the wiring cavity is provided, so that the power line and the connecting line are easy to handle, and the wiring is safe and easy to manufacture.

Referring to fig. 5, it will be appreciated that in some embodiments, the wind-guiding surface 501 is provided on the side of the end teeth 402 facing away from the winding 106, for example, the outer edges of the end teeth 402 are chamfered or rounded, so as to reduce wind resistance during movement of the mover 101. Specifically, the end tooth 402 located at the left end of the mover 101 is provided with the air guiding surface 501 on the left side, and when the mover 101 moves leftwards, air smoothly flows rightwards along the air guiding surface 501, so that the obstruction of the air to the movement of the mover 101 can be reduced. Similarly, the end teeth 402 positioned at the right end of the mover 101 are provided with the air guide surface 501 on the right side, and when the mover 101 moves rightwards, air smoothly flows leftwards along the air guide surface 501, so that the obstruction of the air to the movement of the mover 101 can be reduced.

Referring to fig. 5, it can be understood that one side wall surface of the hollow groove 201 is an arc surface 502, and in this case, the hollow groove 201 is a hollow arc groove, and the arc occupies 1/4 of the whole circle. The circular arc outlet is well treated relative to the opposite outlet when glue is filled. Of course, in other embodiments, the proportion of arc surface 502 may be other values, such as 1/2 of the full circle.

Referring to fig. 6 and 7, it can be understood that the heat sink 108 includes two end plate portions 601, each end plate portion 601 is correspondingly connected to one end tooth 402, and the two end plate portions 601 are disposed on the end face side of the core 105 along the moving direction of the mover 101, that is, the two end plate portions 601 are respectively located on the left end face and the right end face of the core 105, and the two end plate portions 601 are perpendicular to the flat plate portion 202, so that the length of the heat sink 108 is longer than the length of the core 105. The two heat dissipation elements 108 are combined into an annular packaging jig, the middle of the packaging jig accommodates the rotor 101, in other words, the packaging jig can wrap the whole iron core 105 and the winding 106, and the lower side of the packaging jig corresponds to the upper plane of the magnet 104 and is the plane where the inlet of the injection molding plastic packaging material is located.

Referring to fig. 8, it can be understood that, in the process of encapsulating and injection molding, two heat dissipation elements 108, the iron core 105 and the tooling cover plate 801 may be combined into a plastic package box body, that is, by setting the end plate 601, the heat dissipation elements 108 may be used as a part of the encapsulating fixture, so that the plastic package tooling is greatly simplified, and meanwhile, the plastic package manufacturing process is simplified and efficient, and the manufacturing cost is reduced while the heat dissipation effect of the mover 101 is improved. Specifically, two heat dissipation elements 108 are enclosed around the iron core 105, and the heat dissipation main body 204 of the heat dissipation element 108 is attached to the upper portion of the iron core 105, the tooling cover plate 801 is covered on the lower side of the iron core 105, the tooling cover plate 801 is provided with an injection molding opening 802, and plastic packaging materials can be injected from the injection molding opening 802 and flow along gaps among the heat dissipation elements 108, the iron core 105 and the windings 106, and after solidification, a plastic packaging layer 109 is formed.

Referring to fig. 8, it can be understood that the length of the flat plate portion 202 is longer than the length of the end teeth 402 in the up-down direction, so that the flat plate portion 202 protrudes from the end teeth 402 on the side facing the core 105. For example, in the up-down direction, the underside of the flat plate portion 202 is substantially flush with the underside of the winding 106, and the underside of the end tooth 402 is spaced from the underside of the winding 106. The tooling cover plate 801 is correspondingly provided with a recess 803, and the recess 803 is used for being matched with the part of the flat plate part 202 protruding from the end tooth 402, so that the tooling cover plate 801 is conveniently positioned, and the tooling cover plate 801 is prevented from being deviated.

Referring to fig. 9, it can be understood that fig. 9 is a profile view (with a part of the plastic envelope 109 and a part of the heat sink 108 cut away) of a linear motor according to another embodiment of the present utility model, which includes a mover 101 and a stator 102. The structure of the stator 102 may refer to the structure of the stator 102 shown in fig. 1. The mover 101 is located above the stator 102, and the mover 101 is capable of rectilinear motion in the left-right direction. The mover 101 includes an iron core 105, a plurality of windings 106, and an insulating bobbin 107, and the width of the iron core 105 in the front-rear direction substantially matches the width of the magnet 104 in the front-rear direction. The linear motor further comprises two heat dissipation elements 108 and a plastic sealing layer 109, wherein the two heat dissipation elements 108 are respectively positioned on the front side and the rear side. The iron core 105 includes a plurality of teeth 301, each tooth 301 is disposed downward, and a part of the outer circumference of the tooth 301 is provided with the winding 106, and the other part of the outer circumference of the tooth 301 is not provided with the winding 106. Specifically, the windings 106 are wound around the teeth 301 at intervals, that is, in the left-right direction, when the windings 106 are provided on the outer periphery of one tooth 301, the windings 106 are not provided on the outer periphery of the teeth 301 on both the left and right sides. When the outer circumference of one tooth 301 has no winding 106, the outer circumferences of the teeth 301 on the left and right sides thereof are provided with windings 106. In summary, only one and only one of the adjacent two teeth 301 is provided with windings 106.

It will be appreciated that only one of the adjacent teeth 301 is provided with windings 106, indicating that adjacent two windings 106 are separated by one tooth 301, i.e. a tooth is interposed between windings 106. The linear motor with the teeth inserted into the windings 106 has the advantages of small number of coils and low processing cost.

Referring to fig. 10, it is understood that the heat sink 108 has a cover plate-like structure, and the heat sink 108 includes a plurality of intermediate teeth 303, two end teeth 402, and a flat plate portion 202, wherein the plurality of intermediate teeth 303 are provided on a side of the flat plate portion 202 near the core 105, and for example, the plurality of intermediate teeth 303 are provided on a rear side of the flat plate portion 202. Along the moving direction of the mover 101, two end teeth 402 are respectively located at two ends of the plate portion 202, that is, two end teeth 402 are respectively located at left and right ends of the plate portion 202. The plurality of intermediate teeth 303 and the two end teeth 402 are arranged in the left-right direction, and the plurality of intermediate teeth 303 are located between the two end teeth 402, each intermediate tooth 303 is located between the adjacent two windings 106, each end tooth 402 is located outside the windings 106, one end tooth 402 is located at the leftmost side of the windings 106, and the other end tooth 402 is located at the rightmost side of the windings 106, i.e., only one side of the end tooth 402 is adjacent to the windings 106, and the other does not have the windings 106. The length of the heat sink 108 is substantially equal to the length of the core 105, and the heat sink 108 may cover the front and rear end sides of the winding 106 as a whole.

Since one tooth 301 is spaced between two adjacent windings 106, and each intermediate tooth 303 is located between two adjacent windings 106, the width of the intermediate tooth 303 in the left-right direction in the scheme shown in fig. 9 is wider than the width of the intermediate tooth 303 in the left-right direction in the scheme shown in fig. 1, so that the heat dissipation area is increased and the heat dissipation efficiency is improved. As shown in fig. 9 and 10, the intermediate teeth 303 can contact the core 105 in the front-rear direction, and suck out and radiate heat from the core 105, thereby improving heat radiation efficiency. In other words, the thickness of the intermediate tooth 303 in the front-rear direction in the solution shown in fig. 9 is thicker than the thickness of the intermediate tooth 303 in the front-rear direction in the solution shown in fig. 1. In the embodiment shown in fig. 9, the width of the intermediate tooth 303 in the left-right direction is substantially equal to the width of the end tooth 402 in the left-right direction, and the thickness of the intermediate tooth 303 in the front-rear direction is substantially equal to the thickness of the end tooth 402 in the front-rear direction.

Referring to fig. 11, it can be understood that the end teeth 402 are provided with first protrusions 401, correspondingly, the core 105 is provided with first positioning holes 205, the first protrusions 401 are inserted into the first positioning holes 205, the middle teeth 303 are provided with second protrusions 1101, correspondingly, the core 105 is provided with second positioning holes, and the second protrusions 1101 are inserted into the second positioning holes, thereby facilitating the fixing and positioning of the heat sink 108 to the core 105. By the cooperation of the first protrusion 401 and the first positioning hole 205 and the cooperation of the second protrusion 1101 and the second positioning hole, the heat sink 108 is kept at a predetermined position, and the problem of the heat sink 108 being shifted during the glue filling is prevented.

Referring to fig. 11, it will be understood that the second protrusion 1101 is located at an end of the intermediate tooth 303 away from the magnet 104, that is, the second protrusion 1101 is located at an end of the intermediate tooth 303 near the heat dissipating body 204, and that the second protrusion 1101 is located at a tooth root of the intermediate tooth 303, such that the second protrusion 1101 is located away from the magnet 104, may reduce magnetic saturation of the tooth.

Referring to fig. 11, it can be understood that the heat dissipation body 204 is provided with hollow grooves 201, the hollow grooves 201 being arranged in the arrangement direction of the teeth 301, i.e., the hollow grooves 201 being arranged in the left-right direction, the hollow grooves 201 being for receiving the energizing wires or connection lines of the windings 106. In other words, the hollow groove 201 functions as a wiring cavity, and the wiring cavity is provided, so that the power line and the connecting line are easy to handle, and the wiring is safe and easy to manufacture.

Referring to fig. 12, it will be appreciated that in some embodiments, the wind-guiding surface 501 is provided on the side of the end teeth 402 facing away from the winding 106, for example, the outer edges of the end teeth 402 are chamfered or rounded, so as to reduce wind resistance during movement of the mover 101.

Referring to fig. 12, it can be understood that one side wall surface of the hollow groove 201 is an arc surface 502, and in this case, the hollow groove 201 is a hollow arc groove, and the arc occupies 1/4 of the whole circle. The circular arc outlet is well treated relative to the opposite outlet when glue is filled. Of course, in other embodiments, the proportion of arc surface 502 may be other values, such as 1/2 of the full circle.

The structures not illustrated in the schemes shown in fig. 9 to 12 may refer to the same or similar structures in fig. 1 to 8.

In other embodiments, the structures of the mover 101 and the stator 102 in fig. 1 to 12 may be interchanged, that is, the mover 101 includes a fixing plate 103 and a magnet 104, the fixing plate 103 is arranged in the left-right direction, and the magnet 104 is fixed on the fixing plate 103. The mover 101 is located above the stator 102, and the mover 101 is capable of rectilinear motion in the left-right direction. The stator 102 includes a core 105, a plurality of windings 106, and an insulating bobbin 107.

The utility model also provides a scheme of the industrial robot, the industrial robot comprises a robot main body and the linear motor of any embodiment, the linear motor is connected with the robot main body, and the linear motor is used for driving the robot main body to move. The industrial robot may be an articulated welding robot, a transfer robot, an assembly robot, or the like. Since the industrial robot includes all technical features of the above-mentioned linear motor, it also has all advantageous effects thereof, and will not be described in detail herein.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims (13)

1. Linear motor, its characterized in that includes:

the stator is provided with a plurality of permanent magnets which are arranged in a straight line along the length direction of the linear motor;

the rotor is arranged in a sliding manner relative to the stator, the rotor comprises an iron core and a plurality of windings, the iron core comprises a yoke part and a plurality of tooth parts, the tooth parts are connected with the yoke part and are arranged facing the stator, and the windings are wound on the tooth parts and part of the windings protrude out of the side face of the iron core;

the heat dissipation part comprises a heat dissipation main body and a flat plate part, the heat dissipation main body is positioned on one side of the yoke part, and the flat plate part is positioned on one side of the winding;

the plastic layer is filled between the heat dissipation piece and the winding;

the two opposite side surfaces of the iron core are respectively provided with one heat dissipation piece along the direction of the winding protruding out of the iron core, the heat dissipation pieces further comprise end plate parts, the end plate parts cover the end surface of the iron core along the moving direction of the rotor, and the two heat dissipation pieces are abutted to each other, so that the two heat dissipation pieces are surrounded to form a box body with an opening for accommodating the rotor.

2. The linear motor of claim 1, wherein a plurality of heat dissipating ribs are arranged on the outer surface of the heat dissipating member at intervals, and the extending direction of the heat dissipating ribs is consistent with the length direction of the linear motor.

3. The linear motor of claim 1, further comprising an insulating armature, wherein the winding is wound around the insulating armature, wherein the heat sink is in contact with the insulating armature, and wherein a gap is provided between the heat sink and the winding.

4. The linear motor of claim 1, wherein the plastic layer is BMC.

5. The linear motor of any one of claims 1 to 4, wherein the heat sink further comprises a plurality of heat sink teeth connected to the heat sink body, the plurality of heat sink teeth and the plurality of windings are arranged at intervals, the heat sink teeth are divided into a middle tooth and two end teeth, the middle tooth is located between two adjacent windings, and the end teeth are located between an end face of the core and the windings.

6. The linear motor of claim 5, wherein three sides of the flat plate portion are respectively connected to the heat dissipating body and the two end teeth, the heat dissipating body and the end teeth are in contact with side surfaces of the iron core, and the middle teeth are provided on the flat plate portion.

7. The linear motor of claim 6, wherein a hollow groove is formed in a side of the heat dissipating body facing the iron core, and the hollow groove is used for accommodating an energizing wire or a connecting wire of the winding.

8. The linear motor of claim 7, wherein at least one sidewall surface of the hollow slot is an arc surface.

9. The linear motor of claim 6, wherein the length of the flat plate portion is greater than the length of the end teeth in a direction away from the heat dissipating body.

10. The linear motor of claim 6, wherein the end teeth are provided with first protrusions, the core is provided with first positioning holes, and the first protrusions are inserted into the first positioning holes.

11. The linear motor of claim 6, wherein a side of the end teeth facing away from the windings is provided with an air guiding surface.

12. The linear motor of claim 6, wherein the windings are disposed outside each of the teeth.

13. The linear motor of claim 6, wherein only one of the adjacent two teeth is provided with the winding; the middle teeth are in contact with the iron core and are provided with second protrusions, the iron core is provided with second positioning holes, and the second protrusions are inserted into the second positioning holes.

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