A bilateral asymmetric modular permanent magnet linear motor

Abstract

This invention relates to a double-sided asymmetric modular permanent magnet linear motor, comprising a secondary assembly and primary assemblies located on the upper and lower sides of the secondary assembly, with an air gap between them. The primary assembly includes a primary core and a primary winding. The primary core has a toothed structure, comprising primary teeth, upper end teeth on the left and right sides of the primary assembly located above the secondary assembly, and lower end teeth on the left and right sides of the primary assembly located below the secondary assembly. The primary winding is wound around the primary teeth. The two primary assemblies are staggered by the unequal width of their upper and lower end teeth, and the total length of the two primary assemblies is equal, with their ends aligned. This motor, based on the aligned upper and lower structures of the double-sided stator, adopts a double-sided asymmetric tooth structure, featuring simple installation, easy processing, high assembly precision, high thrust density, and low noise.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric machines, in particular to a double-sided asymmetric modular permanent magnet linear motor. BACKGROUND

[0002] As one of the core basic parts of high-end numerical control machine tools and other manufacturing equipment, the linear motor has important significance for the development of equipment in reducing noise and thrust fluctuation and other key performances. The double-sided permanent magnet synchronous motor has the characteristics of high thrust density, small normal force between the primary and secondary, low noise, etc. The existing technology usually uses inclined poles or slotted to reduce the thrust fluctuation of the linear motor, but this method will reduce the thrust density of the motor. In addition, the double-sided stator is offset by a distance to offset the thrust fluctuation, but the double-sided stator structure is not symmetrical up and down, which will cause the double-sided stator to be unbalanced and cause the normal force fluctuation to increase the noise and reduce the control accuracy. In addition, the asymmetry of the upper and lower structures of the double-sided stator will make the production and installation of such motors complex and cause the performance of the motor to decline. SUMMARY

[0003] The technical problem to be solved by the present application is to overcome the deficiencies in the prior art and provide a double-sided asymmetric modular permanent magnet linear motor. The motor has the characteristics of simple installation, easy processing, high assembly precision, high thrust density and low noise based on the alignment of the upper and lower structures of the double-sided stator.

[0004] The present application is implemented by the following technical solutions:

[0005] A double-sided asymmetric modular permanent magnet linear motor, comprising a primary assembly and a secondary assembly, the primary assembly and the secondary assembly forming an air gap therebetween, the primary assembly comprising a primary core and a primary winding, the primary core being a tooth and slot structure, the primary core comprising a primary tooth, an upper side end tooth on the left and right sides of the primary assembly above the secondary assembly, and a lower side end tooth on the left and right sides of the primary assembly below the secondary assembly, the primary winding being wound outside the primary tooth, the two primary assemblies being offset by a distance by the unequal width structure of the upper side end tooth and the lower side end tooth.

[0006] According to the above technical solution, preferably, the secondary assembly comprises a secondary magnetic back plate and secondary permanent magnets on the upper and lower sides of the secondary magnetic back plate.

[0007] According to the above technical solution, preferably, the magnetization directions of the secondary permanent magnets on the upper and lower sides of the secondary magnetic back plate are opposite.

[0008] According to the above technical solution, preferably, the lengths of the upper side end tooth and the lower side end tooth are respectively less than the length of the primary tooth.

[0009] According to the technical scheme, preferably, the total length of the two primary assemblies is equal, and the end portions of the two primary assemblies are aligned.

[0010] According to the technical scheme, preferably, the widths of the two upper end teeth are different, and the widths of the two lower end teeth are different.

[0011] According to the technical scheme, preferably, the widths of the two upper end teeth are the same, and the widths of the two lower end teeth are different.

[0012] According to the technical scheme, preferably, the material of the primary core is a soft magnetic composite material (such as 700HR5P800Mpa) or a lamination type soft magnetic material (such as 50DW465). According to the technical scheme, preferably, a plurality of groups of primary assemblies are arranged on the upper and lower sides of the secondary assembly.

[0013] The present application has the following advantages:

[0014] The present application adopts a double-sided asymmetric structure, the teeth of the primary assemblies arranged on the two sides of the secondary assembly are staggered by a certain distance, so that the cogging forces generated by the upper and lower cores of the motor are offset to each other, further offsetting the cogging force of the motor, and the thrust fluctuation suppression effect is obvious. At the same time, by changing the height of the end teeth, the end force of the two ends of the core is further offset. In addition, the end portions of the upper and lower primary assemblies are aligned, avoiding the imbalance of the force of the double-sided stator, which causes the normal force fluctuation to increase the noise and reduce the control accuracy, while improving the installation convenience and assembly accuracy of such motors, and has good application and popularization value. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a front view structural schematic diagram of embodiments 1 and 2 of the present application.

[0016] Figure 2 is a front view structural schematic diagram of embodiments 3 and 4 of the present application.

[0017] Figure 3 is a thrust, thrust fluctuation and magnetic pull result diagram when the phase angle difference of the double-end current is 0° in embodiment 1 of the present application.

[0018] Figure 4 is a thrust, thrust fluctuation and magnetic pull result diagram when the phase angle difference of the double-end current is 15° in embodiment 1 of the present application.

[0019] Figure 5 is a thrust, thrust fluctuation and magnetic pull result diagram when the phase angle difference of the double-end current is 0° in embodiment 2 of the present application.

[0020] Figure 6 is a thrust, thrust fluctuation and magnetic pull result diagram when the phase angle difference of the double-end current is 15° in embodiment 2 of the present application.

[0021] Figure 7 is the thrust, thrust fluctuation and magnetic pull result chart of the double-ended current phase angle phase difference 0° in the embodiment 3 of the present application.

[0022] Figure 8 is the thrust, thrust fluctuation and magnetic pull result chart of the double-ended current phase angle phase difference 15° in the embodiment 3 of the present application.

[0023] Figure 9 is the thrust, thrust fluctuation and magnetic pull result chart of the double-ended current phase angle phase difference 0° in the embodiment 4 of the present application.

[0024] Figure 10 is the thrust, thrust fluctuation and magnetic pull result chart of the double-ended current phase angle phase difference 15° in the embodiment 4 of the present application.

[0025] Figure 11 is the three-dimensional structure schematic of the embodiment 5 of the present application Figure 1 .

[0026] Figure 12 is the three-dimensional structure schematic of the embodiment 5 of the present application Figure 2 .

[0027] Figure 13 is the thrust, thrust fluctuation and magnetic pull result chart of the primary core material being 700HR5P 800Mpa in the embodiment 5 of the present application.

[0028] Figure 14 is the thrust, thrust fluctuation and magnetic pull result chart of the primary core material being 50DW465 in the embodiment 5 of the present application.

[0029] In the figure: 1, secondary assembly; 2, primary assembly; 3, primary winding; 4, primary core; 5, primary tooth; 6, upper end tooth; 7, secondary permanent magnet; 8, secondary magnetic back plate; 9, lower end tooth. DETAILED DESCRIPTION

[0030] In order to make the person skilled in the art better understand the technical solutions of the present application, the present application will be further described in detail below in combination with the drawings and the best embodiment. All other embodiments obtained by the person skilled in the art on the basis of the embodiments in the application without creative labor belong to the protection scope of the application.

[0031] In the description of the invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the invention.

[0032] In addition, it should be noted that in the description of the invention, unless otherwise explicitly specified and limited, the terms "mounting", "setting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the invention can be understood according to the specific circumstances.

[0033] As shown in the figure, the present application comprises a secondary assembly 1 and a primary assembly 2 located on the upper and lower sides of the secondary assembly 1, and an air gap is formed between the primary assembly 2 and the secondary assembly 1, the secondary assembly 1 comprises a secondary magnetic back plate 8 and a secondary permanent magnet 7 located on the upper and lower sides of the secondary magnetic back plate 8, as shown in the figure, the magnetization directions of the secondary permanent magnets 7 located on the upper and lower sides of the secondary magnetic back plate 8 are opposite. Figure 2 As shown in the figure, the present application comprises a secondary assembly 1 and a primary assembly 2 located on the upper and lower sides of the secondary assembly 1, and an air gap is formed between the primary assembly 2 and the secondary assembly 1, the secondary assembly 1 comprises a secondary magnetic back plate 8 and a secondary permanent magnet 7 located on the upper and lower sides of the secondary magnetic back plate 8, as shown in the figure, the magnetization directions of the secondary permanent magnets 7 located on the upper and lower sides of the secondary magnetic back plate 8 are opposite. The primary assembly 2 comprises a primary core 4 and a primary winding 3, the primary core 4 is a tooth and slot structure, the primary core 4 comprises a primary tooth 5, an upper side end tooth 6 located on the left and right sides of the primary assembly 2 above the secondary assembly 1, and a lower side end tooth 9 located on the left and right sides of the primary assembly 2 below the secondary assembly 1, the primary winding 3 is wound outside the primary tooth 5, the two primary assemblies 2 are staggered by a certain distance along the transverse direction (horizontal direction, X direction) through the unequal width structure of the upper side end tooth 6 and the lower side end tooth 9. Among them, the lengths of the upper side end tooth 6 and the lower side end tooth 9 are respectively less than the length of the primary tooth 5, the total lengths of the two primary assemblies 2 are equal, and the ends of the two primary assemblies 2 are aligned.

[0034] The technical principle of the present application is as follows: by analyzing the force harmonic condition of the motor, keeping the upper and lower ends of the core aligned, changing the width of the end tooth to offset the thrust fluctuation of the motor (caused by the cogging force), by changing the position of the upper and lower ends of the motor tooth, the cogging force generated by the upper and lower cores of the motor is offset, and then the cogging force of the motor is offset; at the same time, by changing the length of the core, the optimal core length is determined to minimize the thrust fluctuation and maximize the thrust, so that the end force of the core is offset, and then the height of the end tooth is further changed to offset the end force.

[0035] The design of the bilateral secondary assembly 1 and the selection of the secondary core material are preferably but not limited to the following embodiments.

[0036] As shown in the embodiment 1, the widths of the two upper end teeth 6 are different, the widths of the two lower end teeth 9 are different, and the material of the primary core 4 is 700HR5P 800Mpa material. Figure 1 The phase angle difference of the double-end current is 0°, the power supply thrust fluctuation is 1.51%, the average thrust is 1009.7119 N, and the magnetic pull is 170.9011 N. Figure 3 The phase angle difference of the double-end current is 15°, the power supply thrust fluctuation is 1.21%, the average thrust is 1026.5 N, and the magnetic pull is 1.0137 N. Figure 4 The phase angle difference of the double-end current is 0°, the power supply thrust fluctuation is 1.81%, the average thrust is 1102.0096 N, and the magnetic pull is 201.0627 N. The phase angle difference of the double-end current is 15°, the power supply thrust fluctuation is 1.58%, the average thrust is 1118 N, and the magnetic pull is 0.8619 N.

[0037] The phase angle difference of the double-end current is 0°, the power supply thrust fluctuation is 2.72%, the average thrust is 1098.396 N, and the magnetic pull is 200.3828 N. Figure 1 The phase angle difference of the double-end current is 15°, the power supply thrust fluctuation is 2.24%, the average thrust is 1114.5863 N, and the magnetic pull is 0.2134 N. Figure 5 The phase angle difference of the double-end current is 0°, the power supply thrust fluctuation is 2.5%, the average thrust is 1006.403 N, and the magnetic pull is 170.2336 N. Figure 6 The phase angle difference of the double-end current is 15°, the power supply thrust fluctuation is 2.1%, the average thrust is 1023.3694 N, and the magnetic pull is 0.3947 N. The phase angle difference of the double-end current is 0°, the power supply thrust fluctuation is 2.72%, the average thrust is 1098.396 N, and the magnetic pull is 200.3828 N.

[0038] The phase angle difference of the double-end current is 15°, the power supply thrust fluctuation is 2.24%, the average thrust is 1114.5863 N, and the magnetic pull is 0.2134 N. Figure 2 The phase angle difference of the double-end current is 0°, the power supply thrust fluctuation is 2.5%, the average thrust is 1006.403 N, and the magnetic pull is 170.2336 N. Figure 7 The phase angle difference of the double-end current is 15°, the power supply thrust fluctuation is 2.1%, the average thrust is 1023.3694 N, and the magnetic pull is 0.3947 N. Figure 8 The phase angle difference of the double-end current is 0°, the power supply thrust fluctuation is 2.72%, the average thrust is 1098.396 N, and the magnetic pull is 200.3828 N. The phase angle difference of the double-end current is 15°, the power supply thrust fluctuation is 2.24%, the average thrust is 1114.5863 N, and the magnetic pull is 0.2134 N.

[0039] The phase angle difference of the double-end current is 0°, the power supply thrust fluctuation is 2.5%, the average thrust is 1006.403 N, and the magnetic pull is 170.2336 N. Figure 2 The phase angle difference of the double-end current is 15°, the power supply thrust fluctuation is 2.1%, the average thrust is 1023.3694 N, and the magnetic pull is 0.3947 N. Figure 9 The phase angle difference of the double-end current is 0°, the power supply thrust fluctuation is 2.72%, the average thrust is 1098.396 N, and the magnetic pull is 200.3828 N. Figure 10 The phase angle difference of the double-end current is 15°, the power supply thrust fluctuation is 2.24%, the average thrust is 1114.5863 N, and the magnetic pull is 0.2134 N. The phase angle difference of the double-end current is 0°, the power supply thrust fluctuation is 2.5%, the average thrust is 1006.403 N, and the magnetic pull is 170.2336 N.

[0040] Embodiment 5: The application includes a secondary assembly 1 and a primary assembly 2 located on the upper and lower sides of the secondary assembly 1, and the primary assembly 2 and the secondary assembly 1 form an air gap, the primary assembly 2 located on the upper and lower sides of the secondary assembly 1 is provided in multiple groups, and the primary assembly 2 can be distributed in a modular manner along the x direction or in a modular manner along the z direction (as shown in Figure 11 , 12 When the phase angle difference of the double-end current is 0°, the average thrust is 1028.7142 N, the thrust fluctuation is 2.08%, and the magnetic pull is 167.8838 N when the material of the primary assembly is 700HR5P 800Mpa, and the average thrust is 1124.2306 N, the thrust fluctuation is 2.25%, and the magnetic pull is 196.3797 N when the material of the primary assembly is 50DW465. Therefore, in this example, by reasonably arranging the positions between the modules, the motor can have low thrust fluctuation and large thrust.

[0041] The application adopts a double-sided asymmetric structure, the teeth of the primary assembly located on the two sides of the secondary assembly are staggered by a certain distance, the tooth slot forces generated by the upper and lower cores of the motor are offset to each other, the tooth slot force of the motor is further offset, the thrust fluctuation suppression effect is obvious, and the lowest thrust fluctuation reaches 1.8%; at the same time, the height of the end tooth is changed to further offset the end force of the two ends of the core; in addition, the two primary assemblies 2 are aligned at the ends, the stress imbalance of the double-sided stator is avoided, the noise increase and the control precision reduction caused by the normal force fluctuation are avoided, the installation convenience and the assembly precision of such a motor are improved, and the application has good application and promotion value.

[0042] The above only describes the preferred embodiments of the application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the application, and these improvements and refinements should also be regarded as the protection scope of the application.

Claims

1. A double-sided asymmetric modular permanent magnet linear motor comprising a secondary assembly and primary assemblies located on the upper and lower sides of the secondary assembly, an air gap being formed between the primary assemblies and the secondary assembly, characterized in that, The primary assembly comprises a primary core and a primary winding, the primary core is of a tooth-and-slot structure, the primary core comprises primary teeth, upper side end teeth on the left and right sides of the primary assembly above the secondary assembly, and lower side end teeth on the left and right sides of the primary assembly below the secondary assembly, the primary winding is wound outside the primary teeth, the total length of the two primary assemblies is equal, and the ends of the two primary assemblies are aligned, the upper and lower side primary teeth are staggered by a distance in the transverse direction through the unequal width structure of the upper side end teeth and the lower side end teeth.

2. The double-sided asymmetric modular permanent magnet linear motor of claim 1, wherein, The secondary assembly comprises a secondary magnetic back plate and secondary permanent magnets on the upper and lower sides of the secondary magnetic back plate.

3. The double-sided asymmetric modular permanent magnet linear motor of claim 2, wherein, The magnetization directions of the secondary permanent magnets on the upper and lower sides of the secondary magnetic back plate are opposite.

4. The double-sided asymmetric modular permanent magnet linear motor of claim 1, wherein, The lengths of the upper side end teeth and the lower side end teeth are respectively less than the length of the primary teeth.

5. The double-sided asymmetric modular permanent magnet linear motor according to any one of claims 1 to 4, characterized in that, The widths of the two upper side end teeth are different, and the widths of the two lower side end teeth are different.

6. The double-sided asymmetric modular permanent magnet linear motor according to any one of claims 1 to 4, characterized in that, The widths of the two upper side end teeth are the same, and the widths of the two lower side end teeth are different.

7. The double-sided asymmetric modular permanent magnet linear motor of claim 1, wherein, The material of the primary core is soft magnetic composite material or laminated soft magnetic material.

8. The double-sided asymmetric modular permanent magnet linear motor of claim 1, wherein, Multiple groups of the primary assembly are arranged on the upper and lower sides of the secondary assembly.

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