Coreless linear motor module

Abstract

The invention relates to the technical field of linear motors, in particular to a coreless linear motor module which comprises a base, an upper magnet yoke plate, a left baffle, a right baffle, a rubber plate, a permanent magnet, an auxiliary magnetic pole, a sliding table, a cooling device, a photoelectric switch, a buffer and the like. The permanent magnets are designed to be arc-shaped, the auxiliary magnetic poles are added, the magnetic field distribution is improved, the magnetic lines are distributed more uniformly, and the thrust fluctuation of the motor is reduced; according to the invention, the rubber plate is arranged, has good elasticity and shock absorption performance, and can play a buffering role when the permanent magnet is subjected to external impact or shock; the motor sliding table is designed to be streamlined, so that air resistance generated during high-speed operation of the motor is reduced; the cooling device is arranged in the motor coil, and the temperature rise can be efficiently reduced through water cooling; the photoelectric switch and the buffer are arranged, violent collision of the motor rotor is reduced, and the service life of the motor is greatly prolonged.

Description

Technical Field

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

[0002] The working mode of traditional linear motors is to use rotating motors and rely on synchronous belts or screw drives to indirectly achieve the process of converting electrical energy into linear motion mechanical energy. Mechanical transmission will inevitably have certain errors, and such errors will in turn cause the positioning accuracy to be less than ideal. Especially in market areas such as high-end automation equipment and CNC machine tools that require extremely high precision, it is urgent to improve these problems. In view of this, a coreless linear motor came into being. In terms of structural design, it abandons related transmission devices such as screws. In this way, a series of problems caused by mechanical transmission, such as low positioning accuracy, wear and high heat generation, are effectively avoided.

[0003] Commonly used motors generally have problems such as large thrust fluctuations and poor positioning accuracy. In contrast, the coreless linear motor has the advantages of small thrust fluctuations and high positioning accuracy, but it also has some shortcomings, such as low thrust density and extremely high winding temperature rise, which leads to limited output power. Summary of the invention

[0004] The object of the present invention is to provide a moving coil coreless linear motor to solve the problems of the existing linear motor in the above background technology, improve the positioning accuracy of the linear motor, enhance the cooling effect of the motor rotor coil, and reduce the heat generated when the motor is running.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: comprising a stator, which is composed of a base (1), an upper magnetic yoke plate (2), a left baffle (3), a right baffle (4), a rubber plate (5), a permanent magnet (6), an auxiliary magnetic pole (7), a guide rail (8) and a grating ruler (9), wherein: the permanent magnet (6) is arranged in an alternating manner with N and S poles, and the corners are arc-shaped; the auxiliary magnetic pole (7) is made of soft magnetic material and is arranged at both ends of the permanent magnet (6) array; the grating ruler (9) is parallelly attached to the front end of the base (1); the mover , comprising a cooling device (10), a winding (11), a slide (12), a slider (13) and an encoder (14), wherein: the winding (11) is wound between the heat sinks (18) of the cooling device (10) and is in direct contact with the S-shaped water cooling channel (10-3); the slide (12) is a streamlined curved surface; the auxiliary protection device comprises a buffer (15) and a photoelectric switch (16), wherein the buffer (15) is made of elastic rubber and is installed on the inner side of the left baffle (3) and the right baffle (4).

[0006] Preferably, the permanent magnets (6) are evenly attached to the surface of the rubber plate (5).

[0007] Preferably, the corners of the permanent magnet (6) are arc-shaped, and the arc radius is 1-3 mm. The soft magnetic material of the auxiliary magnetic pole (7) is an iron-nickel alloy, and is arranged at the left and right ends of the permanent magnet (6) array.

[0008] Preferably, an exhaust hole (20) is provided on the top of the slide table (12), the hole diameter of which is 2-5 mm, and is connected to the air cooling port (19) of the winding (11) to form an air cooling circuit.

[0009] Preferably, heat sinks (18) are evenly arranged on the outer surface of the cooling device (10), the coil (17) is wound between every two adjacent heat sinks (18), and the winding direction of the coil (17) is parallel to the direction of the cooling device.

[0010] Preferably, the cooling device (10) comprises a water inlet (10-1), a water outlet (10-2) and an S-shaped water cooling channel (10-3), wherein the path length of the S-shaped water cooling channel (10-3) is 3-4 times the length of the cooling device (10). The path length of the S-shaped water cooling channel (10-3) is 3-4 times the length of the cooling device (10).

[0011] Preferably, the buffer (15) is made of nitrile rubber with a Shore hardness of 50-70 and a compression deformation rate of ≤10%, and is installed on the inner side of the left baffle (3) and the right baffle (4), respectively, and the buffer (15) and the winding (11) are at the same level.

[0012] Compared with the prior art, the present invention has the following beneficial effects: the arc-shaped permanent magnet can generate a more uniform magnetic field on the magnet surface, avoiding the uneven magnetic field caused by sharp angles or right angles, thereby improving the performance of the magnet; the auxiliary magnetic pole can optimize the magnetic field distribution, reduce magnetic flux leakage, and increase the effective magnetic flux density, thereby increasing the thrust density; the streamlined curved surface design of the slide helps to reduce air resistance, reduce air friction and disturbance. In addition, the rotor coil is directly wound on the cooling device. This design increases the contact area between the rotor coil and the cooling mechanism. When the coil generates heat, it can achieve maximum heat dissipation with the help of the water cooling channel in the cooling device, thereby improving the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the ironless linear motor module provided by the present invention;

[0014] Figure 2 It is an exploded view of the ironless linear motor module provided by the present invention;

[0015] Figure 3 It is a side view of the ironless linear motor module provided by the present invention;

[0016] Figure 4 It is a structural schematic diagram of the permanent magnet array and the rubber sheet of the present invention;

[0017] Figure 5 It is a structural schematic diagram of the slide table of the present invention;

[0018] Figure 6 is a cross-sectional view of the water cooling device of the present invention;

[0019] Figure 7 is a schematic diagram of the coil and the heat sink of the present invention;

[0020] Figure 8 Schematic diagram of epoxy resin cast winding of the present invention.

[0021] In the figure, 1 is a base, 2 is an upper yoke plate, 3 is a left baffle, 4 is a right baffle, 5 is a rubber plate, 6 is a permanent magnet, 7 is an auxiliary magnetic pole, 8 is a guide rail, 9 is a grating ruler, 10 is a cooling device, 10-1 is a water inlet, 10-2 is a water outlet, 10-3 is a water cooling channel, 11 is a winding, 12 is a slide, 13 is a slider, 14 is an encoder, 15 is a buffer, 16 is a photoelectric switch, 17 is a coil, 18 is a heat sink, 19 is an air cooling hole, and 20 is an exhaust hole. DETAILED DESCRIPTION

[0022] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0023] In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] Embodiment one:

[0026] See also Figures 1 to 3 The present invention provides an ironless linear motor module, including: a stator, which is composed of a base 1, an upper yoke plate 2, a left baffle 3, a right baffle 4, a rubber plate 5, a permanent magnet 6, an auxiliary magnetic pole 7, a guide rail 8 and a grating ruler 9, wherein: the permanent magnet 6 is arranged in an alternating manner of NS poles, and the corners are arc-shaped; the auxiliary magnetic pole 7 is a soft magnetic material, and is arranged at both ends of the permanent magnet 6 array; the grating ruler 9 is parallelly pasted to the front end of the base 1; a mover, including a cooling device 10, a winding 11, a slide 12, a slider 13 and an encoder 14, wherein: the winding 11 is wound between the heat sink 18 of the cooling device 10 and is in direct contact with the S-shaped water cooling channel 10-3; the slide 12 is a streamlined curved surface; an auxiliary protection device, including a buffer 15 and a photoelectric switch 16, and the buffer 15 is made of elastic rubber material and is installed on the inner side of the left baffle 3 and the right baffle 4.

[0027] Furthermore, the base 1 is located below the upper yoke plate 2, and the base 1 and the upper yoke plate 2 are fixedly connected with a left baffle 3 and a right baffle 4 on the left and right sides by bolts, which facilitates the installation and disassembly of the module base 1, increases convenience, and improves practicality.

[0028] Furthermore, the bottom of the upper yoke plate 2 and the top of the base 1 are respectively connected with a rubber plate 5 by bolts. The rubber plate 5 can insulate and has good elasticity and shock absorption properties, plays a buffering role, helps to reduce damage to the permanent magnet 6 caused by external impact or vibration, and protects its performance from being affected.

[0029] Furthermore, the encoder 14 is installed in the groove on the front side of the slide, and the back of the grating ruler 9 is coated with a suitable strong adhesive and directly attached to the middle of the front side of the base 1 to ensure that the grating ruler 9 is parallel to the guide rail 8. The encoder 14 is used for dynamic control of the motor body, while the grating ruler 9 is used for accurate feedback of the real position. The two work together to make up for the shortcomings of a single sensor and provide the system with higher reliability and control accuracy.

[0030] See also Figure 4 The arc-shaped design of the permanent magnet 6 can produce a more uniform magnetic field on the surface, avoiding the uneven magnetic field caused by sharp angles or right angles, thereby improving the performance of the permanent magnet 6; the arc-shaped design can disperse stress, avoid local stress concentration, and extend the service life of the permanent magnet 6.

[0031] Furthermore, the auxiliary magnetic poles 7 can optimize the magnetic field distribution of the stator, reduce magnetic flux leakage, increase the effective magnetic flux density, and thus increase the thrust density, thereby improving the overall operating efficiency of the motor.

[0032] See also Figure 5 The streamlined surface design of the slide 12 helps to reduce air resistance, allowing it to pass through the guide rail 8 more smoothly during movement, reducing air resistance to it and improving the stability and accuracy of movement; the streamlined surface of the slide 12 can effectively reduce eddy currents and turbulence in air flow, thereby reducing vibration and noise.

[0033] Based on the above implementation scheme, an exhaust hole 20 is provided on the top surface of the slide 12, and the exhaust hole 20 corresponds to the air cooling hole 19 on the surface of the coil. The exhaust hole 20 is connected with the air cooling hole 19 to effectively cool the winding 11. The air cooling circuit discharges the heat generated by the winding 11 through the exhaust hole 20 to reduce the temperature rise.

[0034] Embodiment 2:

[0035] See also Figure 6 The cooling device 10 includes a water inlet 10-1, a water outlet 10-2 and an S-shaped water cooling channel 10-3. Low-temperature water flows into the water cooling channel 10-3 from the water inlet 10-1. At this time, the winding 11 will continue to generate heat during operation, and the inflowing cold water fully absorbs the heat emitted by the winding 11. With the transfer of heat, the temperature of the water itself gradually increases, and finally becomes high-temperature water, and flows out steadily from the water outlet 10-2, thereby taking away the heat generated by the winding 11. The path length of the S-shaped water cooling channel 10-3 is 3-4 times the length of the cooling device 10. Under the condition of the same water flow volume, the water flow path is extended, thereby increasing the contact area between the cold water and the cooling device 10, which enables the cold water to fully absorb the heat generated by the winding 11 during operation, significantly improving the cooling efficiency, thereby effectively improving the cooling efficiency of the entire system.

[0036] See also Figure 7 The cooling device 10 has heat sinks 18 arranged evenly on the outside of the surface, and the coil 17 is wound between every two adjacent heat sinks 18, and the winding direction of the coil 17 is parallel to the direction of the cooling device. The heat sink 18 increases the heat exchange area between the coil 17 and the surrounding environment, which can effectively improve the heat dissipation capacity of the motor and avoid performance degradation or damage caused by overheating.

[0037] See also Figure 8 The cooling device 10, the winding 11 and the heat sink 18 are cast with epoxy resin as a whole, thereby improving the stability of the winding 11 and enhancing the strength of the coreless linear motor, making it suitable for high-speed and high-acceleration operation. The coil 17 is a square enameled wire, which can fill more wires in a limited space, thereby increasing the number of turns of the winding or the cross-sectional area of ​​the wire, thereby increasing the output power of the motor.

[0038] In the above-mentioned implementation case, a buffer 15 is additionally provided, and the buffer 15 is made of elastic rubber material such as nitrile rubber with a Shore hardness of 50-70. They are respectively installed on the inner side of the left baffle 3 and the right baffle 4. The installation position of the buffer 15 is at the same horizontal line as the winding 11. When the coreless mover moves toward the left and right baffles of the linear motor and approaches the boundary, the two groups of buffers 15 can immediately play a buffering role. They can effectively buffer the violent collision between the left baffle 3 and the right baffle 4 of the coreless mover, minimize the impact force, extend the overall service life of the coreless linear motor, and improve the practicality of the motor.

[0039] Working principle: The working principle of the linear motor is based on the principle of electromagnetic induction. The winding 11 is connected to an external power supply. The current flows into the motor winding 11 to generate a time-varying magnetic field, which then interacts with the magnetic field generated by the stator permanent magnet 6, thereby generating an electromagnetic force. The electromagnetic force drives the slider 13 to move linearly along the linear slide rail 8. The upper and lower rubber plates 5 prevent the stator from moving at high speed and play a buffering and shock-absorbing role on the stator; the auxiliary magnetic poles 7 improve the magnetic field distribution, further smooth the magnetic field, reduce losses and fluctuations, and significantly reduce end effects and eddy current losses; the streamlined design of the slide 12 helps to reduce air resistance during operation, thereby reducing vibration and noise; the winding 11 is directly cooled by the water cooling device 10 to improve the operating reliability and life of the motor; the photoelectric switch 16 is used to detect in advance that the slider is approaching the limit position and send a signal to stop the motor. If the photoelectric switch 16 fails or the control system does not respond in time, the buffer 15 provides the final physical protection; the buffer 15 and the photoelectric switch 16 exist at the same time and work together in the linear motor system to achieve efficient multi-layer protection. The combination of the two ensures the safety of the system and reduces the risk of damage to the equipment due to failure. The encoder 14 is used for dynamic control of the motor body, while the grating ruler 9 is used for accurate feedback of the real position. The two work together to make up for the shortcomings of a single sensor and provide the system with higher reliability and control accuracy.

[0040] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the various technical solutions of the present invention.

Claims

1. A coreless linear motor module, characterized in that: include: The stator is composed of a base (1), an upper magnetic yoke plate (2), a left baffle (3), a right baffle (4), a rubber plate (5), a permanent magnet (6), an auxiliary magnetic pole (7), a guide rail (8) and a grating ruler (9), wherein: the permanent magnet (6) is arranged in an alternating manner of N and S poles, and the corners are arc-shaped; the auxiliary magnetic pole (7) is made of soft magnetic material and is arranged at both ends of the permanent magnet (6) array; the grating ruler (9) is parallelly attached to the front end of the base (1); the mover includes a cooling device (10) , a winding (11), a slide (12), a slider (13) and an encoder (14), wherein: the winding (11) is wound between the heat sinks (18) of the cooling device (10) and is in direct contact with the S-shaped water cooling channel (10-3); the slide (12) is a streamlined curved surface; the auxiliary protection device comprises a buffer (15) and a photoelectric switch (16), the buffer (15) is made of elastic rubber and is installed on the inner side of the left baffle (3) and the right baffle (4).

2. The ironless linear motor module according to claim 1, characterized in that: Permanent magnets (6) are evenly attached to the surface of the rubber plate (5).

3. The ironless linear motor module according to claim 1, characterized in that: The corners of the permanent magnet (6) are arc-shaped, and the arc radius is 1-3 mm. The soft magnetic material of the auxiliary magnetic pole (7) is an iron-nickel alloy, and is arranged at the left and right ends of the permanent magnet (6) array.

4. The ironless linear motor module according to claim 1, characterized in that: An exhaust hole (20) is provided on the top of the slide table (12) with a hole diameter of 2-5 mm, which is connected to the air cooling port (19) of the winding (11) to form an air cooling circuit.

5. The ironless linear motor module according to claim 1, characterized in that: The cooling device (10) has heat sinks (19) arranged evenly on the outside of the surface, the coil (17) is wound between every two adjacent heat sinks, and the winding direction of the coil (17) is parallel to the direction of the cooling device (10).

6. The ironless linear motor module according to claim 1, characterized in that: The cooling device (10) comprises a water inlet (10-1), a water outlet (10-2) and an S-shaped water cooling channel (10-3); the path length of the S-shaped water cooling channel (10-3) is 3 to 4 times the length of the cooling device (10).

7. The ironless linear motor module according to claim 1, characterized in that: The buffer (15) is made of nitrile rubber with a Shore hardness of 50-70 and a compression deformation rate of ≤10%, and is installed on the inner sides of the left baffle (3) and the right baffle (4), respectively, and the buffer (15) and the winding (11) are at the same level.

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