Air-cooled linear motor with iron core

Abstract

The invention discloses an air-cooled linear motor with an iron core. The air-cooled linear motor comprises a primary part, a heat dissipation part, a fixing part, at least one fan and a secondary part, the primary comprises a motor body and an iron core winding arranged in the motor body, and the motor body extends along a first direction; the heat dissipation part is connected to the primary part; the fixing piece is arranged at one end, extending in the first direction, of the motor body and connected to the heat dissipation piece; the at least one fan is connected in the fixing piece; the secondary comprises a yoke plate and a permanent magnet assembly, and the primary can move relative to the secondary in the first direction. The weight of the air cooling structure is very small relative to the weight of the linear motor with the iron core, heat generated in the operation process of the motor can be taken away more effectively after forced cooling of the fan, the heat dissipation effect is better, the overload capacity and continuous output thrust of the motor under different working conditions are improved, and the service life of the motor is prolonged. And extremely high speed and acceleration can be borne while the micron or submicron positioning precision is kept.

Description

Technical Field

[0001] The invention relates to the technical field of linear motors, and in particular to an air-cooled iron-core linear motor. Background Art

[0002] The iron core linear motor is a linear motion device based on the principle of electromagnetic induction. It is a device that directly converts input electrical energy into linear motion. It has the advantages of high power, high efficiency, and high precision. The iron core linear motor has a primary and a secondary. The secondary is mainly composed of a yoke plate and a permanent magnet. The magnetization direction of the permanent magnet is perpendicular to the primary motion direction. The permanent magnets are arranged in sequence along the primary motion direction N and S phases and fixed on the secondary yoke plate. When an alternating current is passed through the primary winding, a traveling wave magnetic field is generated in the air gap. The secondary will induce an electromotive force and generate a current under the cutting of the traveling wave magnetic field. The current interacts with the magnetic field in the air gap to generate an electromagnetic thrust, thereby achieving linear motion.

[0003] The output thrust of an iron core linear motor is closely related to the motor winding current. Usually, the motor thrust is proportional to the winding current. The greater the motor output thrust, the greater the winding input current. According to Joule's law: Q = I 2 Rt, when current flows in a conductor, it generates heat, converting electrical energy into thermal energy. If the heat cannot be effectively dissipated, a series of problems will occur: (1) As the temperature rises, the motor winding loss increases and the motor efficiency decreases; (2) High temperature will also cause the motor thrust to decrease, because high temperature will weaken the magnetism of the motor magnetic track magnet, thereby causing the motor thrust to decrease; (3) High temperature will accelerate the aging of the motor winding insulation material, reduce the insulation strength, and increase the risk of breakdown; (4) The winding will expand due to high temperature, making the insulation between the windings thinner, which can easily lead to local discharge, winding short circuit and other faults; the continuous thermal expansion of the winding may also cause the resin glue layer to bulge, causing friction or stalling between the primary and secondary.

[0004] Most of the existing iron-core linear motors do not have cooling devices. If the iron-core linear motor continues to work under high thrust, high speed and high acceleration conditions, the temperature rise will be very variable and the heat dissipation problem will be more prominent. The iron-core linear motor without a cooling device cannot effectively solve the temperature rise problem by using natural cooling, and often causes problems such as reduced thrust or stopped working due to motor overheating. Although some use water cooling structure to solve the temperature rise problem, adding a water cooling unit will greatly increase the structural size and weight of the motor, which is not conducive to giving full play to the performance advantages of the iron-core linear motor such as high speed, high acceleration and high dynamic characteristics. Summary of the invention

[0005] In view of the shortcomings of the prior art, the object of the present invention is to provide an air-cooled iron-core linear motor.

[0006] In order to achieve the above purpose, the technical solution provided by an embodiment of the present invention is as follows:

[0007] An air-cooled iron core linear motor, comprising:

[0008] A primary, the primary comprising a motor body and an iron core winding arranged in the motor body, the motor body extending along a first direction;

[0009] a heat sink connected to the primary stage;

[0010] A fixing member, disposed at one end of the motor body extending along the first direction and connected to the heat sink;

[0011] at least one fan connected to the fixing member;

[0012] The secondary includes a yoke plate and a permanent magnet assembly arranged on the yoke plate, and the primary can move relative to the secondary along the first direction.

[0013] As a further improvement of the present invention, the heat sink includes an adapter plate, which is arranged on the opening side of the motor body and connected to the primary stage.

[0014] As a further improvement of the present invention, the adapter plate includes an adapter plate body and a plurality of protruding pieces protruding from the adapter plate body, a first airflow channel is formed between adjacent protruding pieces, and the first airflow channel extends along the first direction.

[0015] As a further improvement of the present invention, the primary further includes a plurality of pressure strips embedded in the core winding, and the adapter plate is connected to the plurality of pressure strips.

[0016] As a further improvement of the present invention, the heat sink also includes two heat sink side plates, which are respectively arranged on two opposite sides of the motor body along the second direction, and the two heat sink side plates are both connected to the adapter plate, and the fixing parts are respectively connected to the two heat sink side plates, wherein the first direction is perpendicular to the second direction.

[0017] As a further improvement of the present invention, the heat dissipation side plate includes a side plate body and a plurality of second air flow channels arranged on the side plate body at intervals along a third direction, the second air flow channels extend along the first direction, wherein the third direction is perpendicular to the plane where the first direction and the second direction are located.

[0018] As a further improvement of the present invention, the adapter plate is integrally connected to the two heat dissipation side plates.

[0019] As a further improvement of the present invention, two fans are arranged in the fixing member, and the two fans are arranged at intervals along the second direction.

[0020] As a further improvement of the present invention, a protective cover is arranged outside the fan, and the protective cover is connected to the fixing member.

[0021] As a further improvement of the present invention, the fixing member is connected with a power connector and a communication connector.

[0022] The beneficial effects of the present invention are:

[0023] The weight of the air-cooling structure of the present invention is very small relative to the weight of the iron-core linear motor itself, and does not significantly increase the structural size and weight of the iron-core linear motor, so that the impact of thrust loss caused by increased load is very small. However, the temperature rise of the winding is suppressed by air cooling, and a larger current can be input to output a larger continuous thrust, thereby improving the thrust density. After forced cooling by the fan, the heat generated during the operation of the motor can be more effectively taken away, and the heat dissipation effect is better, thereby improving the overload capacity and continuous output thrust of the motor under different working conditions. It can withstand extremely high speeds and accelerations while maintaining micron or sub-micron positioning accuracy, so that it performs well in applications requiring high thrust and high acceleration, and gives full play to the performance advantages of the iron-core linear motor such as high speed, high acceleration, and high dynamic characteristics. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the decomposed structure of a preferred embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the assembly structure of a preferred embodiment of the present invention;

[0027] Figure 3 It is a schematic diagram of the exploded structure of the primary, fixing parts and fan of the preferred embodiment of the present invention;

[0028] Figure 4 It is a structural schematic diagram of the primary, fixing parts and fan assembly of the preferred embodiment of the present invention;

[0029] Figure 5 for Figure 4 A is an enlarged schematic diagram;

[0030] Figure 6 for Figure 4 The main view of

[0031] Figure 7 for Figure 4 Left view of

[0032] Figure 8 for Figure 4 A top view of

[0033] Fig. 9 It is a schematic structural diagram of the primary stage from another angle of a preferred embodiment of the present invention;

[0034] Fig.10 for Fig. 9 A magnified schematic diagram of B;

[0035] Fig.11 It is a left side view of the fixing base of the preferred embodiment of the present invention;

[0036] Fig.12 It is a schematic structural diagram of a preferred embodiment of the present invention in which a portion of the secondary protective cover is removed;

[0037] Fig.13 A secondary structural diagram of a preferred embodiment of the present invention;

[0038] Fig.14 A schematic top view of the airflow path of a preferred embodiment of the present invention;

[0039] In the figure: 1, primary, 11, motor body, 12, core winding, 13, pressure strip, 2, heat sink, 21, adapter plate, 210, threaded hole, 211, adapter plate body, 212, convex piece, 213, first air flow channel, 22, heat dissipation side plate, 221, side plate body, 222, second air flow channel, 3, fixing member, 31, fixing seat, 32, concave cavity, 33, first through hole, 34, second through hole, 35, third through hole, 4, fan, 41, protective cover, 5, secondary, 51, yoke plate, 52, permanent magnet group, 521, permanent magnet, 53, protective cover, 61, first screw, 62, second screw, 63, third screw, 64, fourth screw, 71, power connector, 72, communication connector. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solutions in the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0041] See also Figure 1-Figure 3The embodiment of the present application discloses an air-cooled iron core linear motor, including a primary 1, a heat sink 2, a fixing member 3, at least one fan 4, and a secondary 5. The primary 1 includes a motor body 11 and an iron core winding 12 disposed in the motor body 11, and the motor body 11 extends along a first direction. The heat sink 2 is connected to the primary 1. The fixing member 3 is disposed at one end of the motor body 11 extending along the first direction and is connected to the heat sink 2. At least one fan 4 is connected to the fixing member 3. The secondary 5 includes a yoke plate 51 and a permanent magnet assembly disposed on the yoke plate 51, and the primary 1 can move relative to the secondary 5 along the first direction.

[0042] In some embodiments, the heat sink 2 includes an adapter plate 21, which is disposed on the open side of the motor body 11 and connected to the primary 1. The setting of the adapter plate 21 can not only remove the heat generated by the operation of the primary 1 through air cooling, but also connect the primary 1 with the carrier of the motion shaft. The part to be moved is installed on the carrier of the motion shaft. The primary 1 serves as a power source, and drives the part to be moved to move relative to the secondary 5 along the first direction through the adapter plate 21 and the carrier of the motion shaft. Preferably, a plurality of threaded holes 210 are provided on the adapter plate 21 to facilitate connection with the carrier of the motion shaft.

[0043] See also Figure 4-Figure 10 In order to better improve the heat dissipation effect of the adapter plate 21, the adapter plate 21 preferably includes an adapter plate body 211, a plurality of convex pieces 212 protruding from the adapter plate body 211, and a first airflow channel 213 is formed between adjacent convex pieces 212, and the first airflow channel 213 extends along the first direction. In this way, the gas after heat exchange is discharged along the first airflow channel 213.

[0044] Please refer to Figure 3 In order to avoid machining mounting holes on the core winding 12, the primary 1 preferably further includes a plurality of pressure strips 13 embedded in the core winding 12, and the adapter plate 21 is connected to the plurality of pressure strips 13 to achieve a stable connection between the adapter plate 21 and the primary 1. The adapter plate 21 is preferably connected to the pressure strips 13 by a plurality of first screws 61.

[0045] In some embodiments, the heat sink 2 also includes two heat sink side plates 22, which are respectively arranged on two opposite sides of the outer side of the motor body 11 along the second direction, and the two heat sink side plates 22 are both connected to the adapter plate 21, and the fixing member 3 is respectively connected to the two heat sink side plates 22, wherein the first direction is perpendicular to the second direction.

[0046] In order to improve the stability between the adapter plate 21 and the heat dissipation side plate 22, it is preferred that a plurality of second screws 62 are connected between the heat dissipation top plate 21 and the heat dissipation side plate 22. It is understandable that the method is not limited to this method, and the adapter plate 21 and the heat dissipation side plate 22 may also be integrally formed and connected. Preferably, the fixing member 3 and the heat dissipation side plate 22 are connected by a third screw 63.

[0047] See also Figure 4-Figure 10 The heat dissipation side plate 22 includes a side plate body 221 and a plurality of second air flow channels 222 spaced along a third direction on the side plate body 221. The second air flow channels 222 extend along a first direction, wherein the third direction is perpendicular to a plane where the first direction and the second direction are located.

[0048] For ease of explanation, Figure 2 The first direction, the second direction, and the third direction are marked in the figure. The first direction is the X-axis direction in the figure, the second direction is the Y-axis direction in the figure, and the third direction is the Z-axis direction in the figure.

[0049] In some embodiments, the adapter plate 21 and the heat dissipation side plate 22 are both made of aluminum alloy. Aluminum alloy has a high thermal conductivity coefficient and good thermal conductivity, thus achieving a good heat dissipation effect. At the same time, aluminum alloy has a low density and is lighter in weight, which can achieve lightweight.

[0050] In order to inhale more airflow and facilitate the rapid discharge of the gas after heat exchange, thereby improving the heat exchange efficiency, two fans 4 are preferably provided in the fixing member 3, and the two fans 4 are arranged at intervals along the second direction.

[0051] In some embodiments, a protective cover 41 is disposed outside the fan 4, and the protective cover 41 is connected to the fixing member 3. Specifically, the protective cover 41 is fixed to the fixing member 3 by a fourth screw 64.

[0052] In some embodiments, the fixing member 3 is connected with a power connector 71 and a communication connector 72. Preferably, the power connector 71 and the communication connector 72 are arranged at intervals along the third direction. Specifically, the power connector 71 is located above the communication connector 72. The power connector 71 is used to connect the power line of the motor body 11 to power the motor body 11, and the communication connector 72 is connected to the Hall line, temperature sensor line and other signal cables in the motor body 11 for communication. The cable of the fan 4 is connected to the communication connector 72 to power the fan 4.

[0053] See also Fig.11 The fixing member 3 includes a fixing seat 31, a concave cavity 32 provided in the fixing seat 31, and at least one first through hole 33 connected to the concave cavity. The arrangement of the concave cavity 32 and the first through hole 33 facilitates the installation of the fan 4 and the suction of external gas into the concave cavity 32. The number of the first through holes 33 is the same as the number of the fan 4. The fixing member 3 also includes a second through hole 34 and a third through hole 35 provided in the fixing seat 31, and the second through hole 34 and the third through hole 35 are both connected to the concave cavity 32. The concave cavity 32 cooperates with the second through hole 34 to facilitate the installation of the power connector 71, and the concave cavity 32 cooperates with the third through hole 35 to facilitate the installation of the communication connector 72.

[0054] See also Fig.12 , Fig.13 The permanent magnet assembly includes two permanent magnet groups 52 that are relatively symmetrically arranged along the second direction, and each permanent magnet group 52 includes a plurality of permanent magnets 521 that are spaced apart and arranged along the first direction.

[0055] The secondary 5 also includes a protective cover 53, which is arranged on the permanent magnet assembly. The setting of the protective cover 53 can protect the permanent magnet 521 from damage and prevent foreign matter from entering. The magnetizing direction of the permanent magnet 521 is perpendicular to the movement direction of the primary 1, that is, the first direction, and the magnetizing direction of the permanent magnet 521 is the second direction. The permanent magnet 521 is fixed on the yoke plate 51 of the secondary 5 facing the side of the primary 1 in accordance with the N pole and the S pole arranged alternately along the movement direction of the primary 1.

[0056] While working, see Fig.14 The fan 4 continuously draws the gas from the outside, i.e., the air inlet side, into the space surrounded by the adapter plate 21, the motor body 11, the two heat dissipation side plates 22 and the fixing member 3 to generate airflow. When the airflow contacts the surface of the motor body 11, the airflow exchanges heat with the heat generated by the iron core winding 12. After the heat exchange, the gas passes through the first airflow channel 213 and the second airflow channel 222 to take away the heat in the direction of the arrow, thereby reducing the temperature of the iron core linear motor.

[0057] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0058] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An air-cooled iron core linear motor, characterized in that: include: A primary, the primary comprising a motor body and an iron core winding arranged in the motor body, the motor body extending along a first direction; a heat sink connected to the primary stage; A fixing member, disposed at one end of the motor body extending along the first direction and connected to the heat sink; at least one fan connected to the fixing member; The secondary includes a yoke plate and a permanent magnet assembly arranged on the yoke plate, and the primary can move relative to the secondary along the first direction.

2. The air-cooled iron core linear motor according to claim 1, characterized in that: The heat sink comprises an adapter plate, which is arranged on the opening side of the motor body and connected to the primary stage.

3. The air-cooled iron core linear motor according to claim 2, characterized in that: The adapter plate includes an adapter plate body and a plurality of protruding pieces protruding from the adapter plate body. A first airflow channel is formed between adjacent protruding pieces, and the first airflow channel extends along the first direction.

4. The air-cooled iron core linear motor according to claim 2, characterized in that: The primary stage further comprises a plurality of pressure strips embedded in the core winding, and the adapter plate is connected to the plurality of pressure strips.

5. An air-cooled iron core linear motor according to claim 2 or 3, characterized in that: The heat sink also includes two heat sink side plates, which are respectively arranged on two opposite sides of the motor body along the second direction, and the two heat sink side plates are both connected to the adapter plate. The fixing member is respectively connected to the two heat sink side plates, wherein the first direction is perpendicular to the second direction.

6. The air-cooled iron core linear motor according to claim 5, characterized in that: The heat dissipation side plate includes a side plate body and a plurality of second air flow channels spaced along a third direction on the side plate body, wherein the second air flow channels extend along the first direction, wherein the third direction is perpendicular to a plane where the first direction and the second direction are located.

7. The air-cooled iron core linear motor according to claim 5, characterized in that: The adapter plate is integrally connected to the two heat dissipation side plates.

8. The air-cooled iron core linear motor according to claim 1, characterized in that: Two fans are arranged in the fixing member, and the two fans are arranged at intervals along the second direction.

9. An air-cooled iron core linear motor according to claim 1 or 8, characterized in that: A protective cover is arranged outside the fan, and the protective cover is connected to the fixing member.

10. The air-cooled iron core linear motor according to claim 1, characterized in that: The fixing member is connected with a power connector and a communication connector.

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