Direct-drive linear motor capable of preventing driving force offset
By symmetrically setting the magnetic drive components and air-floating support structure in the linear motor, the problem of uneven force on the mover is solved, and high-rigidity and high-precision linear motion is achieved, which is suitable for processing, manufacturing, aerospace and other fields.
Patent Information
- Application Number
- CN202423183029.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-09-12
- Estimated Expiration
- 2034-12-23
AI Technical Summary
In existing linear motors, since the motor stator and motor mover are arranged on one side of the guide rail, it is easy to cause uneven force on the mover, affecting the rigidity and movement smoothness.
Two magnetic drive components are symmetrically arranged on the two vertical sides of the linear guide. The magnetic drive components include magnetic rails and coil windings to ensure that the magnetic attraction forces are equal in magnitude and opposite in direction, jointly driving the frame movement, and improving the movement stability through air floating support and magnet adjustment structure.
The frame achieves smooth linear motion on the linear guide rail, improves the rigidity and motion accuracy of the motor, and is capable of driving large mass loads or large acceleration movements.
Smart Images
Figure CN223334562U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a direct-drive linear motor capable of preventing driving force bias. Background Art
[0002] Linear motors have the advantages of fast response speed, high precision, and low energy consumption, and are widely used in processing and manufacturing, aerospace, vehicle manufacturing, medical equipment and other fields. Existing linear motors mainly include a linear guide rail, a motor mover arranged on one side of the linear guide rail, and a motor stator for driving the motor mover. One of the motor mover and the motor stator is a coil winding and the other is a magnet. However, this structure in which the motor stator and motor mover are arranged on one side of the guide rail is easily affected by the magnetic attraction between the magnet and the coil winding, which can easily lead to uneven force on the mover, thereby affecting the rigidity of the mover and the smoothness of movement. Utility Model Content
[0003] The utility model aims to solve at least one of the technical problems existing in the prior art, and proposes a direct-drive linear motor that prevents driving force bias, which has the advantages of high rigidity and smooth operation.
[0004] The utility model proposes a direct-drive linear motor for preventing driving force bias, comprising a linear guide rail, a frame, and a magnetic induction drive assembly for driving the frame to perform linear motion on the linear guide rail; the number of the magnetic induction drive assemblies is two, and the two magnetic induction drive assemblies are symmetrically arranged on two opposite vertical side surfaces of the linear guide rail relative to the straight line; each magnetic induction drive assembly includes a magnetic rail as a motor stator and a coil winding as a motor mover; the two magnetic rails are symmetrically fixed on two opposite vertical side surfaces of the linear guide rail, and the two coil windings are correspondingly fixed on two opposite vertical side surfaces of the frame.
[0005] In some preferred embodiments, grooves are respectively provided on two opposite vertical side surfaces of the linear guide rail, and the two magnetic rails are symmetrically fixed in the two grooves.
[0006] In some preferred embodiments, each magnetic rail is fixed in the groove via a mounting plate.
[0007] In some preferred embodiments, a drag chain frame and a drag chain cable electrically connected to the coil winding are provided on the upper end surface of the linear guide rail; a avoidance groove is provided on the frame, and the drag chain frame is arranged through the avoidance groove.
[0008] In some preferred embodiments, the frame is sleeved on a linear guide rail, a grating scale is provided on the bottom side of the linear guide rail, and a reading head for reading the grating scale is provided on the inner bottom surface of the frame.
[0009] In some preferred embodiments, a sliding fit structure is provided between the frame and the linear guide rail.
[0010] In some preferred embodiments, the sliding fit structure includes a first air floatation generator disposed on the top side of the frame, and an air floatation support is formed between the top side of the frame and the top side of the linear guide rail via the first air floatation generator.
[0011] In some preferred embodiments, the sliding fit structure includes second air floatation generators disposed on two opposite vertical side surfaces of the frame, and the two vertical side surfaces of the frame form air floatation supports between the second air floatation generators and the two vertical side surfaces of the linear guide rail.
[0012] In some preferred embodiments, first magnets are respectively provided on two vertical side surfaces of the linear guide rail, and second magnets are correspondingly provided on two vertical side surfaces of the frame body, and there is a longitudinal height difference between the first magnet and the second magnet.
[0013] In some preferred embodiments, height adjustment devices connected to the second magnet are further provided on the two vertical side surfaces of the frame, and the height adjustment devices are used to adjust the longitudinal height difference of the second magnet relative to the first magnet.
[0014] Compared with the prior art, the present invention has the following beneficial effects:
[0015] The present invention employs two magnetic drive assemblies to jointly drive the frame for linear motion, resulting in a relatively large driving force, suitable for driving large mass loads or linear motion with high acceleration. Furthermore, by symmetrically positioning the two magnetic drive assemblies on the two vertical sides of the linear guide, the magnetic attraction forces generated by each of the two magnetic drive assemblies on the frame are of equal magnitude but opposite directions, thus preventing the magnetic attraction from causing a bias in the driving force generated by the magnetic drive assemblies on the frame. This allows for smoother linear motion of the frame relative to the linear guide, improving the rigidity of the direct-drive linear motor and ensuring that the direct-drive linear motor can provide smooth linear motion with high motion precision. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a three-dimensional structural diagram of an application example of a direct-drive linear motor.
[0017] Figure 2 It is a schematic diagram of the three-dimensional structure of a direct-drive linear motor.
[0018] Figure 3 This is one of the three-dimensional structural diagrams of linear guides.
[0019] Figure 4 This is the second schematic diagram of the three-dimensional structure of the linear guide.
[0020] Figure 5 It is a schematic diagram of the cross-sectional structure of a linear guide.
[0021] Figure 6 It is a schematic diagram of the cross-sectional structure of a direct-drive linear motor.
[0022] Figure 7 It is one of the three-dimensional structural diagrams of the frame.
[0023] Figure 8 This is the second schematic diagram of the three-dimensional structure of the frame. DETAILED DESCRIPTION
[0024] To further illustrate the technical means and effects employed by this application to achieve its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of this application is provided in conjunction with the accompanying drawings and preferred embodiments. In the following description, different references to "one embodiment" or "embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.
[0025] like Figure 1 As shown in the figure, in one application example, the two opposite ends of the direct-drive linear motor in the direction of linear motion are fixed to the workbench 1 via a support frame 2. The direct-drive linear motor mainly includes a linear guide 3, a frame 5, and a magnetic induction drive component disposed between the linear guide 3 and the frame 5. The load 9 is fixed to the top or bottom end of the frame 5. The two opposite ends of the linear guide 3 are fixed to the workbench 1 via the support frame 2. The magnetic induction drive component drives the frame 5 to perform linear motion on the linear guide 3.
[0026] Further integration Figure 2-Figure 8 As shown, there are two magnetic drive assemblies, symmetrically positioned on opposite vertical sides of the linear guide 3 relative to the longitudinal center axis o-o' of the linear guide 3's cross section. Each magnetic drive assembly includes a magnetic rail 4 affixed to a vertical side of the linear guide 3, serving as the motor stator; and a coil winding 6 affixed to a vertical side of the frame 5, serving as the motor mover. Therefore, the two magnetic rails 4 are symmetrically affixed to opposite vertical sides of the linear guide 3, and the two coil windings 6 are correspondingly affixed to opposite vertical sides of the frame 5.
[0027] The two magnetic induction drive components work together to drive the frame 5 from two opposite sides of the frame 5 to perform reciprocating linear motion relative to the linear guide rail 3 in the X-axis direction as needed.
[0028] When the magnetic track 4 of each magnetic drive assembly drives the corresponding coil winding 6 to generate driving force in the X-axis direction, the magnetic track 4 also generates a magnetic attraction force in the Y-axis direction on the coil winding 6. To ensure that the frame 5 does not collide with the linear guide 3 during linear motion due to the Y-axis magnetic attraction force generated by the magnetic drive assembly itself, a structure is adopted in which two magnetic drive assemblies are symmetrically arranged on the two vertical sides of the linear guide.
[0029] The direct-drive linear motor of the present invention is achieved by symmetrically arranging two magnetic induction drive components on the two vertical side surfaces of the linear guide. The motor mover of the magnetic induction drive component located on the first vertical side surface of the linear guide is subjected to a first magnetic attraction force F1 in a first direction generated by the motor stator, and the motor mover of the magnetic induction drive component located on the second vertical side surface of the linear guide is subjected to a second magnetic attraction force F2 in a second direction generated by the motor stator. The first direction is opposite to the second direction, and the first magnetic attraction force F1 is equal to the second magnetic attraction force F2. Therefore, the magnetic attraction forces generated by the motor movers of the two magnetic induction drive components on the frame 5 are the same in magnitude but opposite in direction, thereby avoiding the bias of the driving force generated by the magnetic induction drive component on the frame 5 due to the magnetic attraction force, thereby enabling the frame 5 to move more smoothly and with higher motion accuracy relative to the linear guide 3.
[0030] At the same time, the present invention adopts two magnetic induction drive components to jointly drive the frame 5 to perform linear motion, and the driving force is relatively large, which can meet the needs of driving a load 9 of relatively large mass or linear motion with relatively large acceleration.
[0031] Grooves 31 are respectively provided on two opposite vertical side surfaces of the linear guide rail 3 , and the two magnetic rails 4 are symmetrically fixed in the grooves 31 on the two opposite vertical side surfaces of the linear guide rail 3 .
[0032] To facilitate securing the magnetic rails 4 within the grooves 31, the linear guide 3 is further provided with a mounting plate 32 that is detachably secured within the grooves 31. The magnetic rails 4 are first secured to the mounting plate 32, which is then secured within the grooves 31. This facilitates assembly and utilizes the mounting plate 32 to provide assembly positioning, ensuring that the two magnetic rails 4 are accurately and symmetrically secured to the two vertical sides of the linear guide 3.
[0033] In order to facilitate the routing of the coil winding 6, a drag chain frame 39 and a drag chain cable 38 electrically connected to the coil winding 6 are provided on the upper end face of the linear guide rail 3, and the drag chain cable 38 is electrically connected to the coil winding 6; accordingly, a avoidance groove 59 is provided on the frame 5, and the drag chain frame 39 is arranged through the avoidance groove 59, so that the drag chain frame 39 will not interfere with the linear movement of the frame 5 on the linear guide rail 3.
[0034] In one embodiment, the frame 5 is shaped like a mouth and is mounted on the linear guide rail 3. A grating scale 30 is provided on the bottom side of the linear guide rail 3, and a reading head for reading the grating scale 30 is provided on the inner bottom surface of the frame 5. The reading head reads the grating scale 30 to accurately determine the linear displacement of the frame 5 relative to the linear guide rail 3.
[0035] In addition, a sliding fit structure is provided between the frame 5 and the linear guide rail 3 , and the sliding fit structure allows the frame 5 to move more smoothly relative to the linear guide rail 3 under the driving force of the magnetic induction drive assembly.
[0036] The sliding fit structure can be implemented in various forms, such as a guide rail and slider fit structure, a linear sliding bearing structure, etc.
[0037] In some preferred embodiments, the sliding fit structure adopts an air-floating support structure to reduce the friction between the frame 5 and the linear guide rail 3, allowing the frame 5 to move more smoothly and stably, which is beneficial to improving the motion accuracy of the direct-drive linear motor.
[0038] The sliding fit structure includes a first air flotation generator 58 disposed on the top side of the frame 5. The top side of the frame 5 forms an air flotation support between the first air flotation generator 58 and the top side of the linear guide 3. Preferably, there are multiple first air flotation generators 58, which are evenly spaced and distributed on the top side of the frame 5 relative to the top side of the linear guide 3. They generate a downward air flotation force on the top side of the guide 3 from top to bottom. When the sum of the multiple downward air flotation forces is greater than the total mass of the frame 5 and the load 9 fixed to the frame 5, the frame 5 is floated relative to the linear guide 3. Moreover, since the multiple first air flotation generators 58 are evenly spaced on the top side of the frame 5, the magnitude and position of the reaction force generated by each first air flotation generator 58 on the frame 5 relative to the air flotation force remain balanced, so that the frame 5 remains stable when carrying the load 9 in a linear motion relative to the linear guide 3, ensuring that the direct-drive linear motor moves smoothly and is not prone to jamming, and has high motion accuracy.
[0039] Furthermore, the sliding fit structure includes second air floatation generators 57 disposed on two opposing vertical side surfaces of the frame 5. Specifically, a second air floatation generator 57 is provided on each of the vertical side surfaces of the frame 5, so that air floatation supports are formed between the two vertical side surfaces of the frame 5 and the two vertical side surfaces of the linear guide 3 via the second air floatation generators 57. This air floatation support formed between the two vertical side surfaces of the frame 5 and the two vertical side surfaces of the linear guide 3 by the second air floatation generators 57 further ensures that the direct-drive linear motor is less likely to become stuck during operation, resulting in smoother motion and higher linear motion accuracy.
[0040] Furthermore, to further enhance the rigidity of the direct-drive linear motor and prevent collisions between the frame 5 and the linear guide 3 caused by factors such as the buoyancy force generated by the first air flotation generator 58 and mass changes in the load 9, first magnets 33 are provided on the two vertical side surfaces of the linear guide 3, and second magnets 52 are provided on the two corresponding vertical side surfaces of the frame 5. A longitudinal height difference exists between the first magnets 33 and the second magnets 52. Therefore, the first magnets 33 and the second magnets 52 generate longitudinal magnetic repulsion or attraction. This prevents collisions between the frame 5 and the linear guide 3 due to the buffering effect of the magnetic forces on both sides when the first air flotation generator 58 generates buoyancy force or when the mass of the load 9 changes dramatically. This improves the rigidity of the direct-drive linear motor and ensures smoother linear motion of the direct-drive linear motor.
[0041] The magnitude of the mutually repulsive or mutually attractive magnetic forces can be achieved by adjusting the longitudinal height difference between the second magnet 52 and the first magnet 33. To this end, height adjustment devices 53 connected to the second magnet 52 are provided on the two vertical side surfaces of the frame 5. The height adjustment devices 53 are used to adjust the longitudinal height difference between the second magnet 52 and the first magnet 33.
[0042] For example, a fixing screw hole is provided on the second magnet 52, and an adjustment seat and an adjustment stud fixed longitudinally on the adjustment seat are provided on the vertical side surface of the frame 5. The end of the adjustment stud is screwed into the fixing screw hole of the second magnet 52. By adjusting the screwing depth between the end of the adjustment stud and the fixing screw hole, the longitudinal height position of the second magnet 52 relative to the adjustment seat can be changed, thereby achieving the purpose of adjusting the longitudinal height difference of the second magnet 52 relative to the first magnet 33.
[0043] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.
Claims
1. A direct-drive linear motor for preventing driving force bias, comprising a linear guide rail (3), a frame (5), and a magnetic induction drive assembly for driving the frame (5) to perform linear motion on the linear guide rail (3), characterized in that: The number of magnetic induction drive components is two, and the two magnetic induction drive components are symmetrically arranged on two opposite vertical sides of the linear guide rail (3). Each magnetic induction drive component includes a magnetic rail (4) as a motor stator and a coil winding (6) as a motor mover. The two magnetic rails (4) are symmetrically fixed on two opposite vertical sides of the linear guide rail (3), and the two coil windings (6) are correspondingly fixed on two opposite vertical sides of the frame (5).
2. The direct-drive linear motor according to claim 1, wherein: Grooves (31) are respectively provided on two opposite vertical side surfaces of the linear guide rail (3), and the two magnetic rails (4) are symmetrically fixed in the two grooves (31).
3. The direct-drive linear motor according to claim 2, wherein: Each magnetic rail (4) is fixed in the groove (31) via a mounting plate (32).
4. The direct-drive linear motor according to claim 1, wherein: A drag chain frame (39) and a drag chain cable (38) electrically connected to the coil winding (6) are provided on the upper end surface of the linear guide rail (3); a avoidance groove (59) is provided on the frame (5), and the drag chain frame (39) is arranged through the avoidance groove (59).
5. The direct-drive linear motor according to claim 1, wherein: The frame (5) is sleeved on the linear guide rail (3), a grating ruler (30) is provided on the bottom side of the linear guide rail (3), and a reading head for reading the grating ruler (30) is provided on the inner bottom surface of the frame (5).
6. The direct-drive linear motor according to any one of claims 1 to 5, characterized in that: A sliding fit structure is provided between the frame (5) and the linear guide rail (3).
7. The direct-drive linear motor according to claim 6, characterized in that: The sliding fit structure comprises a first air floatation generator (58) arranged on the top side of the frame (5), and an air floatation support is formed between the top side of the frame (5) and the top side of the linear guide rail (3) through the first air floatation generator (58).
8. The direct-drive linear motor according to claim 7, wherein: The sliding fit structure includes a second air floatation generator (57) arranged on two opposite vertical side surfaces of the frame (5), and the two vertical side surfaces of the frame (5) respectively form air floatation supports between the second air floatation generator (57) and the two vertical side surfaces of the linear guide rail (3).
9. The direct-drive linear motor according to claim 7, wherein: First magnets (33) are respectively provided on the two vertical side surfaces of the linear guide rail (3), and second magnets (52) are correspondingly provided on the two vertical side surfaces of the frame (5), with a longitudinal height difference between the first magnet (33) and the second magnet (52).
10. The direct-drive linear motor according to claim 9, characterized in that: Height adjustment devices (53) connected to the second magnet (52) are also provided on the two vertical side surfaces of the frame (5). The height adjustment devices (53) are used to adjust the longitudinal height difference of the second magnet (52) relative to the first magnet (33).