Miniature precise electric platform

Abstract

The utility model discloses a miniature precise electric platform, and relates to the technical field of magnetic drive transmission. The platform comprises a platform base, a platform plate is arranged on the top of the platform base, baffles are arranged on the front side and the rear side of the platform base, and a magnetic drive transmission assembly is arranged in the platform base. The magnetic drive transmission assembly is used for replacing traditional complex transmission structures such as a lead screw and a servo motor, the size is greatly reduced, and the integration degree is improved. A strong magnetic block group with alternating N / S polarities in a U-shaped motor magnet yoke homogenizes magnetic field distribution, and the periodic cogging force of a traditional linear motor is remarkably weakened, so that a sliding coil generates continuous and uniform electromagnetic thrust to drive a platform plate to move stably. Besides, the clearance of a kinematic pair is reduced through suppression rollers which are arranged in a 90-degree crossed mode, friction resistance is reduced in combination with a coreless coil, efficient driving and submicron positioning precision are achieved under the microminiaturization design, and meanwhile the maintenance complexity is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of magnetic drive technology, and in particular relates to a miniature precision electric platform. Background Technology

[0002] A miniature precision electric platform is a miniaturized, high-precision motion device that integrates precision mechanics, electric drive, and automatic control technologies. It is mainly used to achieve precise positioning, movement, or repetitive motion control within a small range.

[0003] Most current platforms are driven by servo motors and lead screws, and mainly consist of three parts: motor assembly, position control assembly, and protective housing. The motor assembly and monitoring assembly are encapsulated inside the housing, resulting in low integration and significant space waste within the housing. This leads to problems such as excessively large installation size, inconvenient assembly, and difficult maintenance. To address these issues, we provide a miniature precision electric platform to solve the problems mentioned above. Utility Model Content

[0004] The purpose of this utility model is to provide a miniature precision electric platform. By combining a magnetic drive transmission component and a closed-loop feedback component, it solves the problems of existing electric platforms, which are mainly composed of three parts: a motor component, a position control component, and a protective housing. The motor component and the monitoring component are encapsulated inside the housing, resulting in low integration and significant space waste in the housing. This leads to problems such as excessively large installation size, inconvenient assembly, and difficulty in maintenance.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution.

[0006] This utility model relates to a miniature precision electric platform, comprising a platform base, a platform plate on the top of the platform base, baffles on the front and rear sides of the platform base, a magnetic drive transmission assembly inside the platform base, the magnetic drive transmission assembly including a U-shaped motor yoke fixedly connected inside the platform base, a sliding coil slidably connected inside the U-shaped motor yoke, and a closed-loop feedback assembly inside the platform base, including an optical encoder inside the platform base and an optical grating fixedly connected to the bottom of the platform plate.

[0007] The present invention is further configured such that the inner wall of the U-shaped motor yoke is arranged longitudinally with alternating groups of strong magnetic blocks of N / S polarity, and the sliding coil is electrically connected to the U-shaped motor yoke.

[0008] The present invention is further configured such that an anti-creep cross roller guide is fixedly connected between the platform base and the platform plate, and the anti-creep cross roller guide is provided with suppressing rollers inside, the suppressing rollers being arranged in a 90° cross pattern.

[0009] The present invention is further configured such that the optical encoder is model AL26B050-30M, and the optical grating is disposed on one side of the optical encoder.

[0010] The present invention is further configured such that the sliding coil is a coreless structure, and the U-shaped motor yoke has a groove inside that is adapted to the sliding coil.

[0011] The present invention is further configured such that a delivery locking plate is fixedly connected to one side of the platform base, a tension spring seat is fixedly connected to the other side of the delivery locking plate, a tension spring is fixedly connected to one side of the tension spring seat, and the other end of the tension spring is fixedly connected to the platform plate.

[0012] The present invention has the following beneficial effects.

[0013] 1. This utility model replaces traditional complex transmission structures such as lead screws and servo motors with magnetic drive transmission components, significantly reducing size and improving integration. The U-shaped motor's magnetic yoke features a group of strong magnetic blocks with alternating N / S polarities, homogenizing the magnetic field distribution and significantly weakening the periodic cogging force of traditional linear motors. This allows the sliding coil to generate a continuous and uniform electromagnetic thrust, driving the platform plate to move smoothly. Furthermore, the anti-creep cross roller guide reduces the clearance between moving parts through 90° cross-arranged suppressing rollers, and combined with the coreless coil to reduce frictional resistance, achieving efficient drive and sub-micron level positioning accuracy in a miniaturized design, while simultaneously reducing maintenance complexity.

[0014] 2. This invention employs a closed-loop feedback system composed of an optical encoder and an optical grating ruler to monitor the platform plate displacement in real time and generate digital signals. A PID algorithm dynamically adjusts the drive current of the sliding coil to compensate for errors caused by external interference or load fluctuations. Combined with the pre-tightening constraint of the anti-creep cross roller guide and the high-gradient magnetic field drive, the system effectively suppresses micro-creep and vibration, maintaining high-frequency dynamic response capability even at sub-micron positioning accuracy. This design balances high precision and rapid adjustment, making it suitable for scenarios with stringent stability and real-time requirements, such as semiconductor packaging and minimally invasive surgical robots.

[0015] Of course, any product implementing this utility model does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0017] Figure 1 This is a three-dimensional view of a miniature precision electric platform.

[0018] Figure 2This is a top view of the platform base in a miniature precision electric platform.

[0019] Figure 3 This is an exploded view of a miniature precision electric platform.

[0020] Figure 4 This is a three-dimensional diagram of a U-shaped motor yoke, sliding coil, and strong magnetic block assembly in a miniature precision electric platform.

[0021] Figure 5 This is a three-dimensional view of an optical encoder and optical scale in a miniature precision electric platform.

[0022] Figure 6 This is a three-dimensional view of an anti-creep cross roller guide and suppressing rollers in a miniature precision electric platform.

[0023] In the attached diagram: 1. Platform base; 2. Platform plate; 3. Baffle; 4. U-shaped motor yoke; 5. Sliding coil; 6. Optical encoder; 7. Optical grating; 8. Strong magnetic block group; 9. Anti-creep cross roller guide rail; 10. Suppression roller; 11. Shipping locking plate; 12. Tension spring seat; 13. Tension spring. Detailed Implementation

[0024] The technical solutions of the present utility model will be described below with reference to the accompanying drawings. The described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0025] Example 1

[0026] Please see Figures 1-6This utility model relates to a miniature precision electric platform, comprising a platform base 1, a platform plate 2 on top of the platform base 1, baffles 3 on both the front and rear sides of the platform base 1, and a magnetic drive assembly inside the platform base 1. The magnetic drive assembly includes a U-shaped motor yoke 4 fixedly connected inside the platform base 1, and a sliding coil 5 slidably connected inside the U-shaped motor yoke 4. Through the arrangement of the magnetic drive assembly, the interaction between the alternating N / S polarity strong magnetic block group 8 inside the U-shaped motor yoke 4 and the coreless sliding coil 5 (based on the Lorentz force principle) generates a continuous and uniform linear electromagnetic thrust, directly driving the platform plate 2 to move linearly. The alternating polarity arrangement of the strong magnetic block group 8 homogenizes the magnetic field distribution, significantly reducing the periodic resistance (cogging force) caused by the discontinuous magnetic poles in traditional linear motors, ensuring smooth motion. Stable and fluctuation-free, this system replaces traditional complex transmission components such as lead screws, servo motors, and bearing housings, significantly reducing size, increasing integration, and lowering manufacturing costs and maintenance difficulty. The platform base 1 is equipped with a closed-loop feedback component, including an optical encoder 6 housed within the base 1 and an optical grating 7 fixedly connected to the bottom of the platform plate 2. Through the closed-loop feedback component, the optical encoder 6 (AL26B050-30M) and the optical grating 7 work together to collect displacement data of the platform plate 2 in real time, forming a closed-loop control signal. This displacement feedback signal is transmitted to the driver, adjusting the current and magnetic field strength of the sliding coil 5 to compensate for motion errors and ensure positioning accuracy. Combined with the 0.1-micron-level optical grating 7, it suppresses the impact of external vibrations or load changes on positioning stability, ultimately achieving sub-micron level accuracy.

[0027] Example 2

[0028] Please see Figures 1-6Based on Example 1, the inner wall of the U-shaped motor yoke 4 is longitudinally spaced with alternating N / S polarity strong magnetic block groups 8. The sliding coil 5 is electrically connected to the U-shaped motor yoke 4. Through the arrangement of the strong magnetic block groups 8, the alternating N / S polarity strong magnetic block groups 8 significantly weaken or even eliminate the cogging force by homogenizing the magnetic field distribution, so that the sliding coil 5 obtains continuous electromagnetic thrust when energized, ensuring the smooth linear motion of the platform plate 2. The alternating polarity arrangement of the strong magnetic block groups 8 forms a high gradient magnetic field, which, when interacting with the current of the sliding coil 5 (according to the Lorentz force principle), can generate a larger and more uniform linear thrust, improving the platform's driving efficiency and dynamic response capability. An anti-creep cross roller guide 9 is fixedly connected between the platform base 1 and the platform plate 2. The anti-creep cross roller guide 9 is equipped with suppressing rollers 10, which are arranged in a 90° cross pattern. Through the setting of the anti-creep cross roller guide 9, the gap is reduced by the preload, which is used to suppress the small slippage caused by load changes or inertia, achieving sub-nano With meter-level positioning accuracy and high-frequency dynamic response, the optical encoder 6 (model AL26B050-30M) is equipped with an optical scale 7 on one side. The optical encoder 6, mounted on the platform base 1, monitors the displacement of the platform plate 2 in real time. The optical scale 7 and optical encoder 6 work together to form a closed-loop control signal, which is fed back to the U-shaped motor yoke 4 to adjust the driving state of the sliding coil 5. The sliding coil 5 is a coreless structure. The U-shaped motor yoke 4 has a groove inside that matches the sliding coil 5. The coreless structure of the sliding coil 5 prevents it from being attracted by the U-shaped motor yoke 4, further reducing motion resistance. A delivery locking plate 11 is fixedly connected to one side of the platform base 1, and a tension spring seat 12 is fixedly connected to the other side. A tension spring 13 is fixedly connected to one side of the tension spring seat 12, and the other end of the tension spring 13 is fixedly connected to the platform plate 2. The tension spring seat 12 and the tension spring 13 are used to assist in resetting.

[0029] The working principle of this invention is as follows: When the sliding coil 5 is energized by the driver of the U-shaped motor yoke 4, its winding current forms an orthogonal electromagnetic field with the N / S polarity alternating strong magnetic block group 8 arranged longitudinally on the inner wall of the U-shaped motor yoke 4. Under the interaction of the magnetic field and the current vector, the sliding coil 5 generates a continuous linear electromagnetic thrust along the U-shaped yoke groove, and the driving force is directly transmitted to the platform plate 2 through the anti-creep cross roller guide rail 9, realizing nanometer-level linear displacement.

[0030] During the movement, the closed-loop feedback component performs precise measurement and dynamic compensation: the optical grating 7 fixed to the bottom of the platform plate 2 and the optical encoder 6 inside the platform base 1 constitute a high-precision displacement sensing system. When the platform plate 2 moves, the optical encoder 6 reads the displacement signal of the optical grating 7 in real time and generates a digital feedback signal containing position and speed information, which is transmitted to the external driver. The external driver analyzes the deviation between the feedback signal and the target trajectory through a PID algorithm, dynamically adjusts the drive current parameters of the sliding coil 5, and accurately corrects the displacement error caused by load fluctuations or external interference.

[0031] The anti-creep crossed roller guide 9 forms a bidirectional constraint through the 90° cross-arranged suppression rollers 10, reducing the clearance between moving parts under preload. Combined with the uniform magnetic field distribution characteristics of the magnetic drive system, it effectively suppresses the inherent cogging effect and micro-creep phenomena in traditional transmissions, enabling the platform plate 2 to maintain high-frequency dynamic performance with sub-micron positioning accuracy. The entire system achieves high-precision motion control in a miniaturized structure through a closed-loop control cycle of electromagnetic drive, optical feedback, and dynamic correction.

[0032] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A miniature precision electric platform, comprising a platform base (1), characterized in that: The platform base (1) is provided with a platform plate (2) on top, and the platform base (1) is provided with baffles (3) on both the front and rear sides; The platform base (1) is provided with a magnetic drive transmission assembly, which includes a U-shaped motor yoke (4) fixedly connected inside the platform base (1), and a sliding coil (5) is slidably connected inside the U-shaped motor yoke (4). The platform base (1) is equipped with a closed-loop feedback component, which includes an optical encoder (6) installed inside the platform base (1) and an optical grating (7) fixedly connected to the bottom of the platform plate (2).

2. The miniature precision electric platform according to claim 1, characterized in that: The inner wall of the U-shaped motor yoke (4) is longitudinally spaced with groups of strong magnetic blocks (8) with alternating N / S polarities, and the sliding coil (5) is electrically connected to the U-shaped motor yoke (4).

3. The miniature precision electric platform according to claim 1, characterized in that: An anti-creep cross roller guide (9) is fixedly connected between the platform base (1) and the platform plate (2). The anti-creep cross roller guide (9) is provided with suppressing rollers (10) inside, and the suppressing rollers (10) are arranged in a 90° cross pattern.

4. A miniature precision electric platform according to claim 1, characterized in that: The optical encoder (6) is model AL26B050-30M, and the optical scale (7) is located on one side of the optical encoder (6).

5. A miniature precision electric platform according to claim 1, characterized in that: The sliding coil (5) has a coreless structure, and the U-shaped motor yoke (4) has a groove inside that is compatible with the sliding coil (5).

6. A miniature precision electric platform according to claim 1, characterized in that: A delivery locking plate (11) is fixedly connected to one side of the platform base (1), and a tension spring seat (12) is fixedly connected to the other side of the delivery locking plate (11). A tension spring (13) is fixedly connected to one side of the tension spring seat (12), and the other end of the tension spring (13) is fixedly connected to the platform plate (2).

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