Direct Drive Motor

Abstract

The present invention provides a direct drive motor. [Solution] The direct drive motor includes primary and secondary assemblies, the primary assembly includes a slide base, a coil assembly fixed thereto, and two first end covers respectively fixed to opposite circumferential sides of the slide base, the secondary assembly includes a base installed opposite the slide base, a magnetic yoke fixed to the base, a magnetic steel assembly fixed to the magnetic yoke, and two second end covers fixed to opposite circumferential sides of the base, the slide base is slidably supported on the base, the side of the second end cover close to the magnetic yoke is provided with a mounting groove recessed in a direction away from the magnetic yoke, and both opposing ends of the magnetic yoke are inserted and fixed into the mounting grooves of the two second end covers. The present invention shortens the distance between the two second end covers, making the structural dimensions of the direct drive motor compact and suitable for application scenes with limited space.

Description

[Technical field]

[0001] The present invention relates to the field of motor technology, and more particularly to direct drive motors. [Background technology]

[0002] The direct drive motor is a motor structure that forms a slide support by two assemblies and can perform linear motion by the generated thrust action, and includes a primary assembly and a secondary assembly.

[0003] The primary assembly mainly includes a slide base and a coil assembly fixed to the slide base, while the secondary assembly mainly includes a base slidably supported on the slide base, a magnetic yoke fixed to the side of the base adjacent to the slide base, a magnetic steel assembly fixed to the side of the magnetic yoke adjacent to the slide base and installed opposite the coil assembly at a distance, and two end covers fixed to two opposing peripheral sides of the base, respectively.

[0004] The principle of a direct drive motor is that an air gap magnetic field is generated between a coil assembly and a magnetic steel assembly, and the magnetic steel assembly can induce a magnetic field; when a current is passed through the coil assembly, the coil assembly can generate a traveling wave magnetic field, which generates a thrust force between the coil assembly and the magnetic steel assembly, thereby driving the linear motion of the other when either the primary assembly or the secondary assembly is fixed.

[0005] In the secondary assembly of a conventional direct drive motor, the sides of the magnetic yoke adjacent to the two end covers are either flush with the corresponding end covers or maintain a certain mounting distance. Due to this structure, when the magnetic yoke has the same dimensions, the distance between the two end covers becomes greater, and the overall space occupied by the direct drive motor becomes larger, making it unsuitable for application scenarios with limited space. Summary of the Invention [Problem to be solved by the invention]

[0006] The technical problem to be solved by the present invention is to provide a direct drive motor that has a compact structure and can be applied to applications where space is limited. [Means for solving the problem]

[0007] In order to solve the above technical problems, the present invention provides a direct drive motor, which includes a primary assembly and a secondary assembly, The primary assembly includes a slide base, a coil assembly fixed to the slide base, and two first end covers fixed to opposing circumferential sides of the slide base, the secondary assembly includes a base disposed opposite the slide base, a magnetic yoke fixed to the base on a side adjacent to the slide base, a magnetic steel assembly fixed to the side adjacent to the slide base of the magnetic yoke, and two second end covers fixed to opposite circumferential sides of the base, respectively; the slide base is slidably supported on the base, the magnetic steel assembly is disposed opposite to the coil assembly and spaced apart to generate a driving force by interaction, and the two second end covers are disposed opposite to the two first end covers and spaced apart, respectively; A mounting groove is located on the side of the second end cover adjacent to the magnetic yoke, and is recessed in a direction away from the magnetic yoke, and the two opposing ends of the magnetic yoke are inserted and fixed into the mounting grooves of the two second end covers, respectively.

[0008] Preferably, an orthogonal projection of each of the mounting grooves onto the corresponding first end cover is at least partially located on the first end cover, and an orthogonal projection of the magnetic steel assembly onto the primary assembly is at least partially located on the first end cover.

[0009] Preferably, the mounting groove is a rectangular structure.

[0010] Preferably, the groove depth of each of the mounting grooves along the direction from the side closest to the first end cover to the side away from the first end cover is greater than or equal to the sum of the thicknesses of the magnetic yoke and the magnetic steel assembly.

[0011] Preferably, the coil assembly includes an iron core fixed to a side of the slide base adjacent to the base, and a plurality of coils wound around the iron core.

[0012] Preferably, the iron core includes a flat plate portion fixed to the side of the slide base adjacent to the base, and a plurality of extension portions formed to protrude and extend from the side of the flat plate portion adjacent to the base toward the base and installed at intervals, and the coil is wound around each of the extension portions.

[0013] Preferably, the primary assembly further includes two first guide rails respectively fixed to opposite ends of the slide base, and the secondary assembly further includes two second guide rails respectively fixed to opposite ends of the base, and the two first guide rails are respectively supported by the two second guide rails and form a slide connection.

[0014] Preferably, each of the first guide rails has opposing peripheral sides that form fixed connections with each of the two first end covers, and each of the second guide rails includes a first slider and a second slider that are fixed at a distance from each other on the side of the base adjacent to the slide base, and the first guide rail is supported by the corresponding second slider and first slider and forms a sliding connection.

[0015] Preferably, the direct drive motor further includes a first position feedback unit and a second position feedback unit arranged opposite and spaced apart, one of the first position feedback unit and the second position feedback unit being fixed to a side of the slide base adjacent to the pedestal, and the other of the first position feedback unit and the second position feedback unit being fixed to a side of the pedestal adjacent to the slide base, and the second position feedback unit being configured to read position information of the first position feedback unit.

[0016] Preferably, the first position feedback unit is a scale fixed to a side of the slide base adjacent to the pedestal, and the second position feedback unit is a scale reading head fixed to a side of the pedestal adjacent to the slide base. Effect of the Invention

[0017] Compared to prior art, the direct drive motor of the present invention has a mounting groove formed on the side of the second end cover closest to the magnetic yoke, recessed in the direction away from the magnetic yoke, and the opposing ends of the magnetic yoke are inserted and fixed into the mounting grooves of the two second end covers, respectively. This allows the distance between the two second end covers to be closer when the dimensions of the magnetic yoke are the same, making the structural dimensions of the direct drive motor more compact and suitable for applications in limited spaces.

[0018] In order to more clearly describe the technical solutions in the embodiments of the present invention, the following briefly introduces drawings necessary for describing the embodiments. Obviously, the drawings described below are only the embodiments of the present invention, and those skilled in the art can further obtain other drawings based on these drawings without any creative work. [Brief description of the drawings]

[0019] [Figure 1]FIG. 1 is an exploded view showing a schematic structure of a direct drive motor according to an embodiment of the present invention. [Diagram 2] 1 is a schematic diagram showing a three-dimensional structure of a direct drive motor according to an embodiment of the present invention. [Diagram 3] FIG. 3 is a cross-sectional view taken along the line AA in FIG. [Figure 4] FIG. 3 is a cross-sectional view taken along line BB in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, the technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the drawings of the embodiments of the present invention, and it is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments that a person skilled in the art can obtain without creative labor are all included in the protection scope of the present invention.

[0021] As shown in FIGS. 1 to 4, an embodiment of the present invention provides a direct drive motor 100, which includes a primary assembly 1 and a secondary assembly 2.

[0022] Specifically, the primary assembly 1 includes a slide base 11, a coil assembly 12 fixed to the slide base 11, and two first end covers 13 fixed to opposite peripheral sides of the slide base 11, respectively.

[0023] Specifically, the secondary assembly 2 includes a base 21 arranged opposite the slide base 11, a magnetic yoke 22 fixed to the side of the base 21 adjacent to the slide base 11, a magnetic steel assembly fixed to the side of the magnetic yoke 22 adjacent to the slide base 11, and two second end covers 24 fixed respectively to both opposing peripheral sides of the base 21, the slide base 11 being slidably supported on the base 21, the magnetic steel assembly being arranged opposite and spaced apart from the coil assembly 12 to generate a driving force through interaction, and the two second end covers 24 being arranged opposite and spaced apart from the two first end covers 13, respectively.

[0024] A mounting groove 241 is provided on the side of the second end cover 24 close to the magnetic yoke 22, and is recessed in a direction away from the magnetic yoke 22. The two opposing ends of the magnetic yoke 22 are inserted and fixed into the mounting grooves 241 of the two second end covers 24, respectively.

[0025] In this embodiment, the magnetic steel assembly includes a plurality of magnetic steel pieces 23 fixed at intervals on the side of the magnetic yoke 22 adjacent to the slide base.

[0026] In this embodiment, the orthogonal projection of each mounting groove 241 onto the corresponding first end cover 13 is at least partially located on the first end cover 13, and the orthogonal projection of the magnetic steel assembly onto the primary assembly 1 is at least partially located on the first end cover 13. By installing in this manner, not only can the distance between the two second end covers 24 be shortened, but also the mounting area of ​​the magnetic steel assembly can be increased.

[0027] In this embodiment, the mounting groove 241 has a rectangular structure, which can facilitate mounting the opposing ends of the magnetic yoke 22 into the mounting grooves 241 of the two second end covers 24. Of course, according to actual needs, the mounting groove 241 can also be designed to be trapezoidal, elliptical, etc.

[0028] In this embodiment, the depth of each of the mounting grooves 241 along the direction from the side close to the first end cover 13 to the side away from the first end cover 13 is equal to or greater than the sum of the thicknesses of the magnetic yoke 22 and the magnetic steel assembly. By installing them in this manner, the plane of the magnetic steel assembly close to the slide base 11 is made flush with the plane of the second end cover 24 close to the first end cover 13, or the plane of the magnetic steel assembly close to the slide base 11 is made lower than the plane of the second end cover 24 close to the first end cover 13, thereby reducing the space required for the magnetic yoke 22 and the magnetic steel assembly and making the structural dimensions of the direct drive motor 100 compact.

[0029] In this embodiment, the coil assembly 12 includes an iron core 121 fixed to the side of the slide base 11 close to the base 21, and a plurality of coils 122 wound around the iron core 121, respectively.

[0030] The iron core 121 includes a flat plate portion 1211 fixed to the side of the slide base 11 adjacent to the base 21, and a plurality of extension portions 1212 formed to protrude and extend from the side of the flat plate portion 1211 adjacent to the base 21 toward the base 21 and installed at intervals, and a coil 122 is wound around each of the extension portions 1212.

[0031] By adding the iron core 121, the coil 122 can be wound around the extension portion 1212 of the iron core 121, which makes it easier to fix the coil 122 to the slide base 11 and also makes it possible to space the multiple coils 122 apart from one another to provide insulation.

[0032] In this embodiment, the primary assembly 1 further includes two first guide rails 14 respectively fixed to opposite ends of the slide base 11, and the secondary assembly 2 further includes two second guide rails 25 respectively fixed to opposite ends of the base 21, and the two first guide rails 14 are respectively supported by the two second guide rails 25 and form a slide connection.

[0033] Opposing circumferential sides of each first guide rail 14 are fixedly connected to the two first end covers 13, respectively.

[0034] Each second guide rail 25 includes a first slider 251 and a second slider 252 fixed at a distance from each other on the side of the base 21 adjacent to the slide base 11, and the first guide rail 14 is supported by the corresponding second slider 252 and first slider 251 and forms a sliding connection.

[0035] By installing two first guide rails 14 on the slide base 11, two second guide rails 25 are installed on the pedestal 21, and in this way the pedestal 21 can be easily supported on the slide base 11 so as to be slidably and stably.

[0036] In addition, in this embodiment, the direct drive motor 100 further includes a first position feedback unit and a second position feedback unit that are installed opposite each other and spaced apart, one of the first position feedback unit and the second position feedback unit is fixed to a side of the slide base 11 close to the pedestal 21 and the other is fixed to a side of the pedestal 21 close to the slide base 11, and the second position feedback unit is used to read position information of the first position feedback unit.

[0037] The first position feedback unit is a scale 15 fixed to the side of the slide base 11 adjacent to the pedestal 21, and the second position feedback unit is a scale reading head 26 fixed to the side of the pedestal 21 adjacent to the slide base 11.

[0038] By providing the first position feedback unit and the second position feedback unit in this manner, the position information of the primary assembly 1 or the secondary assembly 2 after it is moved can be easily read.

[0039] In this embodiment, the operating principle of the direct drive motor 100 is that an air gap magnetic field is generated between the coil 122 and the magnetic steel 23, and the magnetic steel 23 can induce a magnetic field. When a current is passed through the coil 122, the coil 122 can generate a traveling wave magnetic field, which generates a thrust force between the coil 122 and the magnetic steel 23, thereby driving the linear motion of the other when one of the primary assembly 1 or the secondary assembly 2 is fixed.

[0040] In addition, when the primary assembly 1 or the secondary assembly 2 moves, the scale reading head 26 can further read the position information of the scale 15, thereby obtaining the position information after the primary assembly 1 or the secondary assembly 2 moves.

[0041] Compared with the prior art, the direct drive motor 100 of this embodiment has a mounting groove 241 formed on the side of the second end cover 24 closest to the magnetic yoke 22, recessed in a direction away from the magnetic yoke 22, and the opposing ends of the magnetic yoke 22 are inserted and fixed into the mounting grooves 241 of the two second end covers 24, respectively. This makes it possible to make the distance between the two second end covers 24 closer when the dimensions of the magnetic yoke 22 are the same, thereby making the structural dimensions of the direct drive motor 100 more compact and suitable for application scenes with limited space.

[0042] The above is an embodiment of the present invention, and those skilled in the art may make various modifications without departing from the creative concept of the present invention, all of which are within the scope of protection of the present invention. [Explanation of symbols]

[0043] 100 Direct Drive Motor 1 Primary Assembly 11 Slide Base 12 Coil Assembly 121 Iron Core 1211 Flat plate part 1212 Extension 122 Coil 13 1st end cover 14 First guide rail 15 Scale 2 Secondary Assembly 21 Pedestal 22 Magnetic Yoke 23 Magnetic steel 24 2nd end cover 241 Mounting groove 25 Second guide rail 251 First Slider 252 Second Slider 26 Scale reading head

Claims

1. A direct drive motor, a primary assembly and a secondary assembly, The primary assembly includes a slide base, a coil assembly fixed to the slide base, and two first end covers fixed to opposite ends of the slide base, respectively; the secondary assembly includes a base disposed opposite the slide base, a magnetic yoke fixed to the base on a side adjacent to the slide base, a magnetic steel assembly fixed to the side adjacent to the slide base of the magnetic yoke, and two second end covers fixed to opposite circumferential sides of the base, respectively; the slide base is slidably supported on the base, the magnetic steel assembly is disposed opposite to the coil assembly and spaced apart to generate a driving force by interaction, and the two second end covers are disposed opposite to the two first end covers and spaced apart, respectively; A direct drive motor characterized in that a mounting groove is provided on the side of the second end cover adjacent to the magnetic yoke, the mounting groove being recessed in a direction away from the magnetic yoke, and two opposing ends of the magnetic yoke in the short direction are inserted and fixed into the mounting grooves of the two second end covers, respectively.

2. 2. The direct drive motor of claim 1, wherein an orthogonal projection of each of the mounting grooves projected onto the corresponding first end cover is at least partially located on the first end cover, and an orthogonal projection of the magnetic steel assembly projected onto the primary assembly is at least partially located on the first end cover.

3. 3. The direct drive motor according to claim 2, wherein a side cross section of the mounting groove is rectangular.

4. 4. A direct drive motor as described in claim 2 or 3, characterized in that the groove depth of each of the mounting grooves along the direction from the side closest to the first end cover to the side away from the first end cover is equal to or greater than the sum of the thicknesses of the magnetic yoke and the magnetic steel assembly.

5. 2. The direct drive motor according to claim 1, wherein the coil assembly includes an iron core fixed to a side of the slide base adjacent to the base, and a plurality of coils each wound around the iron core.

6. 6. The direct drive motor according to claim 5, wherein the iron core includes a flat plate portion fixed to a side of the slide base adjacent to the base, and a plurality of extension portions formed to protrude and extend from the side of the flat plate portion adjacent to the base toward the base and installed at intervals, and the coil is wound around each of the extension portions.

7. 2. The direct drive motor of claim 1, wherein the primary assembly further includes two first guide rails fixed to opposite ends of the slide base, and the secondary assembly further includes two second guide rails fixed to opposite ends of the base in the longitudinal direction, the two first guide rails being supported by the two second guide rails, respectively, and forming a slide connection.

8. 8. The direct drive motor according to claim 7, wherein each of the first guide rails has opposing sides that form fixed connections with the two first end covers, and each of the second guide rails includes a first slider and a second slider that are fixed at a distance from each other on a side of the base adjacent to the slide base, and the first guide rail is supported by the corresponding second slider and first slider and forms a sliding connection.

9. 2. The direct drive motor of claim 1, further comprising a first position feedback unit and a second position feedback unit arranged opposite to each other and spaced apart from each other, one of the first position feedback unit and the second position feedback unit being fixed to a side of the slide base adjacent to the pedestal, and the other of the first position feedback unit and the second position feedback unit being fixed to a side of the pedestal adjacent to the slide base, and the second position feedback unit being configured to read position information of the first position feedback unit.

10. 10. The direct drive motor according to claim 9, wherein the first position feedback unit is a scale fixed to a side of the slide base adjacent to the pedestal, and the second position feedback unit is a scale reading head fixed to a side of the pedestal adjacent to the slide base.

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