Coreless linear motor

Abstract

A coreless linear motor disclosed by the present invention comprises a primary assembly and a secondary assembly, the primary assembly can linearly move relative to the secondary assembly, and the primary assembly comprises a substrate and a winding arranged on the substrate. The secondary assembly comprises a supporting plate, a first yoke plate and a second yoke plate, and is fixedly connected with a first permanent magnet group and a second permanent magnet group, and the first permanent magnet group and the second permanent magnet group are sequentially arranged at intervals of N and S in the linear motion direction of the primary assembly; the first permanent magnet set and the second permanent magnet set are oppositely arranged, a certain distance is formed between the first permanent magnet set and the second permanent magnet set so that the primary assembly can linearly move, and an air cooling unit is arranged on the primary assembly. The problem of heat dissipation of the coreless linear motor is solved, the overload capacity and continuous output thrust of the motor under different working conditions are improved, and the coreless linear motor is simple in structure, light in weight and obvious in cooling effect.

Description

Technical Field

[0001] The invention provides an iron-coreless linear motor, and relates to the technical field of linear motors. Background Art

[0002] The coreless linear motor is a linear motion device based on the principle of electromagnetic induction. It eliminates the iron core structure in traditional motors and adopts an ironless design, so that the motor does not need to overcome the magnetic resistance and eddy current loss of the iron core during operation, thereby greatly improving the efficiency and performance of the motor.

[0003] The coreless linear motor has a primary and a secondary. The magnetization direction of the secondary permanent magnet is perpendicular to the primary movement direction. The permanent magnets are arranged in sequence along the primary movement direction N and S phases and fixed on the inner side of the secondary yoke plate. The primary is mainly composed of a substrate and a winding, and is located between two rows of secondary magnetic plates. 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.

[0004] The output thrust of the coreless linear motor is closely related to the motor winding current. The electrical load of the motor increases the motor thrust density, thereby greatly improving the motor output thrust. However, this will inevitably lead to a significant increase in the motor winding current density, causing the winding temperature to rise rapidly.

[0005] Coreless linear motors generate a lot of heat during operation. If the heat cannot be effectively dissipated, the motor will overheat, reduce working efficiency or even damage the motor. Especially under high-speed and high-acceleration operating conditions, the heat dissipation problem is more prominent and requires corresponding heat dissipation solutions to solve it.

[0006] Coreless linear motors usually use double-row magnetic tracks. Due to their structural characteristics, the windings do not have enough heat dissipation space. The increase in winding temperature will lead to increased thermal resistance, which in turn causes a series of problems:

[0007] 1. As the temperature rises, the resistance of the copper wire in the motor winding will increase, resulting in increased resistance losses and reduced motor efficiency.

[0008] 2. High temperature will also cause the motor thrust to decrease, because high temperature will weaken the magnetism of the motor track magnet, which will lead to a decrease in motor thrust.

[0009] 3. High temperature will accelerate the aging of motor winding insulation materials, reduce insulation strength and increase the risk of breakdown.

[0010] 4. The winding will expand due to high temperature, making the insulation between the windings thinner, which can easily lead to partial discharge, winding short circuit and other faults. The continuous thermal expansion of the winding may also cause the resin layer to bulge, causing friction or stalling between the primary and secondary.

[0011] Under low speed and low acceleration conditions, the temperature rise changes relatively little, and the coreless linear motor without cooling device can meet the use requirements in a short time. However, if the running speed and acceleration of the motor are to be increased, the temperature rise will change greatly, and the heat dissipation problem will become more prominent, which requires a corresponding heat dissipation solution.

[0012] However, the natural cooling of the coreless linear motor without a cooling device cannot effectively solve the temperature rise problem. Although the water cooling structure can effectively 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 coreless linear motor such as high speed, high acceleration, and high dynamic characteristics. Summary of the invention

[0013] In order to solve the above problems, the present invention provides an ironless linear motor. The specific technical solution is as follows:

[0014] A coreless linear motor, wherein the coreless linear motor comprises a primary component and a secondary component, the primary component can move linearly relative to the secondary component, the primary component comprises a substrate and a winding arranged on the substrate, the secondary component comprises a support plate, a first yoke plate and a second yoke plate fixedly connected to the support plate, a first permanent magnet group fixedly connected to the first yoke plate and arranged in sequence along the moving direction of the primary component, and a second permanent magnet group fixedly connected to the second yoke plate and arranged in sequence along the moving direction of the first primary component, the first permanent magnet group and the second permanent magnet group are both arranged in sequence along the linear motion direction N and S of the primary component, the first permanent magnet group and the second permanent magnet group are arranged facing each other and there is a certain distance between them for the linear movement of the primary component, and an air cooling unit is provided on the primary component.

[0015] Preferably, the windings are arranged in sequence along the linear motion direction of the primary component, and the air cooling unit is located on the periphery of the windings along the linear motion direction of the primary component.

[0016] Preferably, the air cooling unit includes a first capillary tube, a second capillary tube and a third capillary tube arranged along the linear moving direction of the primary component, the first capillary tube is connected to one end of the third capillary tube, and the second capillary tube is connected to the other end of the third capillary tube.

[0017] Preferably, the third capillary tube is provided with a plurality of exhaust holes along the linear moving direction of the primary component.

[0018] Preferably, the central axis of the first capillary, the central axis of the second capillary and the central axis of the third capillary are located in the same plane.

[0019] Preferably, the center plane where the windings are arranged is coplanar with the plane.

[0020] Preferably, the air cooling unit further includes a first air inlet connector connected to the first capillary tube and a second air inlet connector connected to the second capillary tube.

[0021] Preferably, the substrate is provided with a first capillary fixing member for fixing the first capillary to the substrate and a second capillary fixing member for fixing the second capillary to the substrate, the first air inlet connector extends through the first capillary fixing member and is connected to the first capillary, and the second air inlet connector extends through the second capillary fixing member and is connected to the second capillary.

[0022] Preferably, the substrate is further provided with a third capillary fixture and a fourth capillary fixture, the third capillary fixture is provided with a channel, the channel is connected to both the first capillary and the third capillary, the fourth capillary fixture is provided with a passage, the passage is connected to both the second capillary and the third capillary.

[0023] Beneficial effect: The coreless linear motor proposed in the present invention is a brand-new structural design. The heat dissipation problem of the coreless linear motor is solved through a new air-cooling unit, and the overload capacity and continuous output thrust of the motor under different working conditions are improved. The new air-cooled coreless linear motor has a simple structure, light weight, and obvious cooling effect. It can solve a series of problems caused by excessive temperature rise when natural cooling is used, solve the problems of low continuous thrust and weak instantaneous acceleration ability, and is conducive to high-speed and high-acceleration movement of the coreless linear motor. 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 are briefly introduced below.

[0025] Figure 1 It is a three-dimensional schematic diagram of an ironless linear motor provided in a specific embodiment of the present application.

[0026] Figure 2 yes Figure 1 Schematic diagram of the three-dimensional exploded view of the ironless linear motor.

[0027] Figure 3 yes Figure 1 Front view of the primary assembly in an ironless linear motor.

[0028] Figure 4 yes Figure 3 Bottom view of the primary assembly.

[0029] Figure 5 yes Figure 4AA section view.

[0030] Figure 6 yes Figure 4 Cross-sectional view of the third capillary exhaust hole.

[0031] Figure 7 Schematic diagram of the air flow path of the air cooling unit in the coreless DC motor. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0033] Unless otherwise defined, all professional and scientific terms used herein have the same meanings as those familiar to those skilled in the art. In addition, any methods and materials similar or equivalent to those described herein may be applied to the present invention. The preferred implementation methods and materials described herein are for demonstration purposes only and are not intended to limit the content of this application.

[0034] The experimental methods in the following examples are conventional methods unless otherwise specified, and the experimental materials used in the following examples are purchased from commercial channels unless otherwise specified.

[0035] like Figures 1 to 6 As shown, the present application discloses an ironless linear motor, wherein the ironless linear motor includes a primary component 10 and a secondary component 12, the primary component 10 can move linearly relative to the secondary component 12, the primary component 10 includes a substrate 14 and a winding 16 arranged on the substrate 14, the secondary component 12 includes a support plate 18, a first yoke plate 20 and a second yoke plate 22 fixedly connected to the support plate 18, a first permanent magnet group 24 fixedly connected to the first yoke plate 20 and arranged in sequence along the moving direction of the primary component 10, and a second permanent magnet group 26 fixedly connected to the second yoke plate 22 and arranged in sequence along the moving direction of the first primary component 10, the first permanent magnet group 24 and the second permanent magnet group 26 are both arranged in sequence along the linear motion direction N and S of the primary component 10, the first permanent magnet group 24 and the second permanent magnet group 26 are arranged face to face and have a certain distance between them for the primary component 10 to move linearly, and an air cooling unit is provided on the primary component 10.

[0036] The ironless linear motor proposed in the present invention is a brand-new structural design. The heat dissipation problem of the ironless linear motor is solved through a new air cooling unit, and the overload capacity and continuous output thrust of the motor under different working conditions are improved. The new air-cooled ironless linear motor has a simple structure, light weight, and obvious cooling effect. It can solve a series of problems caused by excessive temperature rise when natural cooling is used, solve the problems of low continuous thrust and weak instantaneous acceleration ability, and is conducive to high-speed and high-acceleration movement of the ironless linear motor.

[0037] Specifically, the base plate 14 is a primary main bearing component, used to fix the winding 16, the air cooling unit and other parts. Usually, the material of the base plate 14 is an insulating plate, such as carbon fiber, FR4 (epoxy glass fiber board) or other similar glass fiber boards, composite base plates (CEM series), phenolic resin boards, and materials formed by epoxy resin potting glue by injection molding, etc. Of course, the base plate 14 can also be made of other insulating materials.

[0038] The windings 16 are placed in the base plate 14 , arranged according to size, and embedded in wires to shape. The windings 16 are connected in series or in parallel and then the power lines are welded. A cable fixing part 28 is also provided on the primary component 10 , and the power lines are fixed by the cable fixing part 28 .

[0039] Specifically, the windings 16 are arranged in sequence along the linear motion direction of the primary component 10 , and the air cooling unit is located on the periphery of the windings 16 along the linear motion direction of the primary component 10 .

[0040] Furthermore, the air cooling unit includes a first capillary tube 30, a second capillary tube 32 and a third capillary tube 34 arranged along the linear movement direction of the primary component 10, the first capillary tube 30 is connected to one end of the third capillary tube 34, and the second capillary tube 32 is connected to the other end of the third capillary tube 34.

[0041] The third capillary tube 34 is provided with a plurality of exhaust holes 36 in the direction of linear movement along the primary component 10 .

[0042] In addition, the central axis of the first capillary 30 , the central axis of the second capillary 32 , and the central axis of the third capillary 34 are located in the same plane.

[0043] Furthermore, the center plane where the windings 16 are arranged is coplanar with the plane.

[0044] The air cooling unit further includes a first air inlet connector 38 communicating with the first capillary tube 30 and a second air inlet connector 40 communicating with the second capillary tube 32 .

[0045] The substrate 14 is provided with a first capillary fixing part 42 for fixing the first capillary 30 to the substrate 14 and a second capillary fixing part 44 for fixing the second capillary 32 to the substrate 14, the first air inlet connector 38 extends through the first capillary fixing part 42 and is connected to the first capillary 30, and the second air inlet connector 40 extends through the second capillary fixing part 44 and is connected to the second capillary 32.

[0046] The substrate 14 is also provided with a third capillary fixing member 46 and a fourth capillary fixing member 48. The third capillary fixing member 46 is provided with a channel, which is connected to the first capillary 30 and the third capillary 34. The fourth capillary fixing member 48 is provided with a passage, which is connected to the second capillary 32 and the third capillary 34.

[0047] During the installation process, the first capillary tube 30 is inserted into the first capillary tube fixture 42 and the third capillary tube fixture 46, the second capillary tube 32 is inserted into the second capillary tube fixture 44 and the fourth capillary tube fixture 48, and the third capillary tube 34 is inserted into the third capillary tube fixture 46 and the fourth capillary tube fixture 48, so as to form an air cooling unit. The first capillary tube fixture 42, the second capillary tube fixture 44, the third capillary tube fixture 46 and the fourth capillary tube fixture 48 are all provided with threaded holes, and there are through holes at corresponding positions on the substrate 14, and the first capillary tube fixture 42, the second capillary tube fixture 44, the third capillary tube fixture 46 and the fourth capillary tube fixture 48 are fixed to the substrate 14 by screws.

[0048] The exhaust holes 36 are arranged in an array on the third capillary tube 34, and the angle α of the exhaust holes 36 on the third capillary tube 34 is adjusted. The angle α is usually in the range of 0-45°, and the appropriate angle can be adjusted according to the needs. After the angle is adjusted, the left and right sides of the third capillary tube 34 are fixed with glue. The glue not only fixes the angle of the third capillary tube 34, but also seals the connection position of the third capillary tube 34, the third capillary tube fixing member 46 and the fourth capillary tube fixing member 48 to prevent air leakage.

[0049] In addition, glue is used to fix and seal the connection positions of the first capillary tube 30, the first capillary tube fixture 42 and the third capillary tube 34, and glue is used to fix and seal the connection positions of the second capillary tube 32, the second capillary tube fixture 44 and the fourth capillary tube fixture 48 to prevent air leakage.

[0050] The first air inlet connector 38 is mounted on the first capillary fixing member 42, and the second air inlet connector 40 is mounted on the second capillary fixing member 44, and both are connected by threads, and the threaded mounting positions of the first air inlet connector 38 and the second air inlet connector 40 are sealed by raw tape or glue. The first air inlet connector 38 and the second air inlet connector 40 are both connected to the air pipe and the air supply equipment (such as an air pump, etc.).

[0051] like Figure 7 As shown, the air flow path during operation is illustrated. Part of the gas enters the first capillary fixing member 42, the first capillary 30 and the third capillary fixing member 46 from the first air inlet connector 38, and finally enters the third capillary 34. Part of the gas enters the second capillary fixing member 44, the second capillary 32 and the fourth capillary fixing member 48 from the second air inlet connector 40, and finally enters the third capillary 34. The gases on both sides converge in the third capillary 34, and then the gas flows out through the exhaust hole 36 of the third capillary 34 to form an airflow, which directly acts on the primary winding 16 and the secondary permanent magnet at the corresponding position. The gas and the winding 16 generate heat to achieve heat exchange, take away the heat, and avoid heat accumulation in the secondary, thereby cooling both the primary component 10 and the secondary component 12.

[0052] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

[0053] The present invention and its implementation methods are described above, which is not restrictive. The drawings are only one of the implementation methods of the present invention, and the actual application is not limited thereto. In short, if ordinary technicians in the field are inspired by it and design methods and embodiments similar to the technical solution without creativity without departing from the purpose of the invention, they should all fall within the protection scope of the present invention.

Claims

1. An ironless linear motor, characterized in that: The ironless linear motor includes a primary component and a secondary component, the primary component can move linearly relative to the secondary component, the primary component includes a substrate and a winding arranged on the substrate, the secondary component includes a support plate, a first yoke plate and a second yoke plate fixedly connected to the support plate, a first permanent magnet group fixedly connected to the first yoke plate and arranged in sequence along the moving direction of the primary component, and a second permanent magnet group fixedly connected to the second yoke plate and arranged in sequence along the moving direction of the first primary component, the first permanent magnet group and the second permanent magnet group are both arranged in sequence along the linear motion direction N and S of the primary component, the first permanent magnet group and the second permanent magnet group are arranged facing each other and there is a certain distance between them for the primary component to move linearly, and an air cooling unit is provided on the primary component.

2. The ironless linear motor according to claim 1, characterized in that: The windings are arranged in sequence along the linear motion direction of the primary component, and the air cooling unit is located at the periphery of the windings along the linear motion direction of the primary component.

3. The ironless linear motor according to claim 2, characterized in that: The air cooling unit includes a first capillary tube, a second capillary tube and a third capillary tube arranged along the linear moving direction of the primary component, the first capillary tube is connected to one end of the third capillary tube, and the second capillary tube is connected to the other end of the third capillary tube.

4. The ironless linear motor according to claim 3, characterized in that: The third capillary tube is provided with a plurality of exhaust holes in a direction along which the primary component moves linearly.

5. The ironless linear motor according to claim 3, characterized in that: The central axis of the first capillary, the central axis of the second capillary, and the central axis of the third capillary are located in the same plane.

6. The ironless linear motor according to claim 5, characterized in that: The center plane where the windings are arranged is coplanar with the plane.

7. The ironless linear motor according to claim 3, characterized in that: The air cooling unit further includes a first air inlet connector connected to the first capillary tube and a second air inlet connector connected to the second capillary tube.

8. The ironless linear motor according to claim 6, characterized in that: The substrate is provided with a first capillary fixing part for fixing the first capillary to the substrate and a second capillary fixing part for fixing the second capillary to the substrate, the first air inlet connector extends through the first capillary fixing part and is connected to the first capillary, and the second air inlet connector extends through the second capillary fixing part and is connected to the second capillary.

9. The ironless linear motor according to claim 3, characterized in that: The substrate is also provided with a third capillary fixture and a fourth capillary fixture. The third capillary fixture is provided with a channel, which is connected to the first capillary and the third capillary. The fourth capillary fixture is provided with a passage, which is connected to the second capillary and the third capillary.

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