Miniature hollow cup brushless motor servo drive integrated module

Abstract

The utility model discloses a micro hollow cup brushless motor servo drive control integrated module, including the shell, be equipped with drive control integrated module structure in the shell, and drive control integrated module structure is by the micro hollow cup brushless motor output shaft front end interference fit pressure into D type output shaft, motor output shaft rear end interference fit pressure into magnetic stone support, and the sintered neodymium iron boron permanent magnet is fixed with L type PCB board on the anaerobic glue curing process of magnetic stone support, and with the magnetic encoder integrated on L type PCB board constitutes the non -contact angle detection system. The utility model discloses through the innovative structure design and material technology optimization, realizes high integration, high reliability and ultrahigh precision's drive control integration function, not only has reduced the volume greatly, solved the traditional module volume redundancy's problem, and through the integrated design reduced the assembly error, improved the precision of angle detection. The non -contact angle detection system and optimized PCB layout enhance the anti -interference ability, ensure the integrity of signal in compact space.

Description

Technical Field

[0001] In the field of micro drive control technology, specifically, it relates to a drive and control integrated module structure based on magnetic encoder feedback, which is particularly suitable for microelectromechanical systems (MEMS) with stringent requirements for space constraints, anti-interference performance and angle control accuracy, such as aerospace micro servo motors. Background Technology

[0002] With the rapid development of modern military technology, radar phased arrays, which achieve beam scanning by electronically controlling the phase and amplitude of antenna array elements, are constantly being improved and upgraded to address existing problems such as mechanical rotation limitations, reliability, and limited functionality. This technology not only plays a powerful role in the military field but also benefits the people in civilian fields such as weather radar, civil aviation air traffic control, and autonomous driving.

[0003] Traditional drive and control modules typically employ a separate design for the motor and encoder, which presents the following technical challenges:

[0004] Volume redundancy: The split structure leads to an increase in axial length, making it difficult to meet miniaturization requirements;

[0005] Sensitive to assembly errors: The mechanical connection between the motor and the encoder is easily affected by installation tolerances, which can lead to a decrease in angle detection accuracy.

[0006] Insufficient interference resistance: Discrete PCB layout is susceptible to electromagnetic noise interference, especially in compact spaces where signal integrity is difficult to guarantee;

[0007] Poor environmental adaptability: Traditional sealing methods are difficult to meet both radiation resistance and airtightness requirements. Utility Model Content

[0008] The purpose of this invention is to provide a miniature hollow cup brushless motor servo drive and control integrated module to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a miniature hollow cup brushless motor servo drive and control integrated module, characterized in that it includes: a housing, inside which is a drive and control integrated module structure, wherein the front end of the output shaft of the 8mm outer diameter miniature hollow cup brushless motor is press-fitted into a D-shaped output shaft, which can be used to insert an antenna to provide rotational power, and the rear end of the motor output shaft is press-fitted into a magnetic support, wherein a sintered neodymium iron boron permanent magnet is fixed on the magnetic support using an anaerobic adhesive curing process, and together with a magnetic encoder integrated on an L-shaped PCB board, it constitutes a non-contact angle detection system.

[0010] Furthermore, it also includes upper and lower concave brackets, located inside the housing, for fixing the miniature hollow cup brushless motor and the L-shaped PCB board. The upper and lower concave brackets include an upper concave bracket and a lower concave bracket. The upper and lower concave brackets are respectively provided with arc-shaped clamping blocks for clamping and fixing the miniature hollow cup brushless motor and are symmetrically arranged. The upper and lower concave brackets on the front side of the arc-shaped clamping blocks are respectively provided with motor slots for clamping the front end of the miniature hollow cup brushless motor; the upper and lower concave brackets on the rear side of the arc-shaped clamping blocks are respectively provided with L-shaped slots for clamping the L-shaped PCB board.

[0011] Furthermore, the upper and lower support brackets are made of PA66 plastic raw material with 30% glass fiber material.

[0012] Furthermore, the concentricity deviation between the central axis of the neodymium iron boron permanent magnet and the sensing surface of the magnetic encoder is 0.02 mm, and the sensing distance is constant at 0.6-0.8 mm.

[0013] Furthermore, the L-shaped PCB board uses FR-4 substrate, and the signal layer and power layer are separated by blind via + buried via process. The vertical multi-layer circuit interconnection is achieved by wave soldering process. The wave soldering uses nitrogen gas with a nitrogen oxygen content of less than 50ppm, a peak temperature of 245℃±5℃, a soldering time of less than 3 seconds, and the thickness of the solder joint IMC layer is controlled at 2-4μm.

[0014] Furthermore, the outer shell is made of aluminum-magnesium alloy.

[0015] Furthermore, the L-shaped PCB board is equipped with wire connectors, and the side walls of the upper and lower brackets are provided with limiting grooves for engaging the wire connectors.

[0016] The beneficial effects of this utility model are:

[0017] I. This utility model's integrated drive and control motor uses a lightweight brushless motor as the direct drive force for the antenna, simplifying the traditional mechanical transmission method. Under the dual action of the drive circuit and magnetic encoder induction, it can meet the following requirements:

[0018] 1. Maximum turning time under load: ≤40ms for a 180° turn.

[0019] 2. Positioning accuracy: ≤±1° start / stop;

[0020] 3.360° absolute position at any angle, shortest path control.

[0021] II. The integrated drive and control motor of this utility model is an independent unit. The motor, drive and magnetic encoder are integrated into a frame shell. It can realize the operation of the integrated drive motor by a single command, or realize the unified operation of all integrated drive and control motors in the system through the LIN protocol command. The control interface is CAN2.0B, which has functions such as position fixed-point broadcast / single-point control, electrical zero position setting at any position, motor ID number change and position query.

[0022] Third, it features a single modular structure, which allows for flexible replacement and low maintenance costs. Each array element integrates an independent T / R component, offering high flexibility and representing modern mainstream technology.

[0023] IV. Components and raw materials must be 100% domestically produced and of industrial grade or above; lightweight and possess strong radiation resistance and weight reduction characteristics.

[0024] Fifth, the design of this module not only significantly reduces its size, solving the problem of redundant volume in traditional modules, but also reduces assembly errors and improves the accuracy of angle detection through its integrated design. Meanwhile, the non-contact angle detection system and optimized PCB layout enhance anti-interference capabilities, ensuring signal integrity within a compact space. Furthermore, the housing and bracket made of special materials not only improve the module's environmental adaptability but also meet the requirements for radiation resistance and airtightness, enabling it to operate stably in various harsh environments. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the exploded structure of this utility model. Detailed Implementation

[0026] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a full understanding of this utility model. However, this utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed below.

[0027] Please see Figure 1This embodiment provides a servo drive and control integrated module for a miniature hollow cup brushless motor 3, which includes a housing 1, upper and lower brackets 2, and a drive and control integrated module structure. The drive and control integrated module structure is located inside the upper and lower brackets 2, which are located inside the housing 1. The drive and control integrated module structure consists of an 8mm outer diameter miniature hollow cup brushless motor 3 output shaft front end interference fit pressed into a D-shaped output shaft 4, which can be used to insert an antenna to provide rotational power. The rear end of the motor output shaft is interference fit pressed into a magnetic support 5. A sintered neodymium iron boron permanent magnet 6 is fixed on the magnetic support 5 using an anaerobic adhesive curing process. Together with a magnetic encoder 8 integrated on an L-shaped PCB board 7, it forms a non-contact angle detection system. This system can accurately detect the rotation angle of the motor, ensuring the stability and accuracy of the module during high-speed operation. The design of the D-shaped output shaft 4 not only enhances the structural stability but also facilitates connection with various transmission devices, improving the versatility and practicality of the module. In addition, the selection of the 8mm outer diameter micro hollow cup brushless motor 3 makes the module small in size and light in weight, which is easy to integrate into various small devices and meets the application scenarios with strict space requirements.

[0028] In this embodiment, the upper and lower concave-convex brackets 2 include an upper concave-convex bracket 20 and a lower concave-convex bracket 21. The upper and lower concave-convex brackets 20 and 21 are respectively provided with arc-shaped clamping blocks 201 for holding and fixing the miniature hollow cup brushless motor 3 and are symmetrically arranged. The upper and lower concave-convex brackets 20 and 21 on the front side of the arc-shaped clamping blocks 201 are respectively provided with motor slots 202 for clamping the front end of the miniature hollow cup brushless motor 3. The upper and lower concave-convex brackets 20 and 21 on the rear side of the arc-shaped clamping blocks 201 are respectively provided with L-shaped slots 203 for clamping the L-shaped PCB board 7. In addition, the L-shaped PCB board 7 is provided with wire connectors 9. The side walls of the upper and lower concave-convex brackets 20 and 21 are provided with limiting slots 204 for clamping the wire connectors 9. This design not only ensures the stable installation of the miniature hollow cup brushless motor 3 in the module, but also facilitates the positioning and fixing of the L-shaped PCB board 7. The cooperation between the motor slot 202 and the arc-shaped retaining block 201 effectively prevents the motor from shaking during high-speed operation, improving the stability and durability of the module. The L-shaped slot 203 design allows the L-shaped PCB board 7 to be securely installed within the module, preventing loosening or damage due to vibration or impact. Simultaneously, the wire connector 9, secured by the limiting slot 204, ensures the reliability and stability of the circuit connection, further enhancing the module's performance. With such a precise structural design, the module achieves excellent performance with a maximum load-bearing rotation time of 180°, ≤40ms, fully meeting the requirements of high-speed, high-precision drive control.

[0029] In an optional embodiment, the L-shaped PCB board 7 uses FR-4 substrate and separates the signal layer from the power layer using blind via + buried via technology. Vertical multi-layer circuit interconnection is achieved through wave soldering, which employs nitrogen protection (oxygen content <50ppm), a peak temperature of 245℃±5℃, and a soldering time of <3 seconds to ensure the IMC layer thickness at the solder joints is controlled within 2-4μm. The L-shaped PCB board 7's interlocking structure design fully utilizes internal space, with a bottom-leading wire connector 9 providing input terminal docking, reducing the overall size of the device. This L-shaped PCB board 7 design not only improves the reliability and durability of the circuit board but also optimizes the internal space layout of the module. The choice of FR-4 substrate ensures good electrical performance and mechanical strength of the circuit board. The application of blind via + buried via technology effectively separates the signal layer from the power layer, reduces electromagnetic interference, and improves signal transmission quality. The choice of wave soldering ensures the reliability and stability of the vertical multi-layer circuit interconnection on the circuit board. The use of nitrogen protection further reduces the risk of oxidation during the soldering process. Strict control of peak temperature and soldering time guarantees the uniformity and consistency of the IMC layer thickness at the solder joints, thereby improving the reliability of the solder joints. The L-shaped PCB board with a 7-pair interlocking structure makes full use of the internal space of the module, allowing for a reduction in the overall size of the device and meeting the miniaturization and lightweight requirements of modern electronic devices. The bottom lead-out wire connector 9 provides a convenient input terminal docking method, simplifying the module's installation and debugging process.

[0030] In an optional embodiment, the upper and lower brackets 20 and 21 are made of PA66 plastic raw material with 30% glass fiber. This material selection not only enhances the mechanical strength and wear resistance of the brackets but also ensures the stability and durability of the module during high-speed operation. PA66 plastic raw material has good insulation and corrosion resistance, effectively preventing the impact of current leakage and corrosion on module performance. Simultaneously, the addition of 30% glass fiber further improves the rigidity and heat resistance of the brackets, enabling the module to maintain stable performance in harsh working environments. Using PA66 plastic raw material with 30% glass fiber to construct the upper and lower brackets 20 and 21 to fix the miniature hollow cup brushless motor 3 and the L-shaped PCB board 7 effectively ensures that the concentricity deviation between the central axis of the neodymium iron boron permanent magnet 6 and the sensing surface of the magnetic encoder 8 is within 0.02mm, and the sensing distance is constant within the range of 0.6-0.8mm, significantly reducing nonlinear errors caused by hysteresis loss.

[0031] In an optional embodiment, the outer shell 1 is made of A5052 aluminum-magnesium alloy, which is lightweight and exhibits significant advantages in radiation protection applications (especially electromagnetic radiation shielding and particle radiation protection). It encases the internal structure, providing high-strength radiation protection, while the joints are filled with sealing silicone for airtightness. Furthermore, the outer shell 1 made of A5052 aluminum-magnesium alloy has good corrosion resistance, high mechanical strength, lower density than steel, and is lightweight. It also possesses good tensile strength and ductility, effectively protecting internal components from damage upon impact. The lightweight design of the outer shell 1 not only reduces the overall weight of the module but also improves the module's dynamic response speed and flexibility, enabling the module to complete tasks more quickly and accurately during high-speed operation. Simultaneously, the excellent radiation resistance of the A5052 aluminum-magnesium alloy provides reliable electromagnetic shielding and particle radiation protection for the module, effectively preventing external radiation from interfering with and damaging the internal electronic components, further enhancing the module's stability and reliability.

[0032] In summary, the miniature hollow cup brushless motor servo drive and control integrated module provided by this utility model achieves high-speed, high-precision drive control through precise structural design and high-quality material selection, while ensuring the module's stability and durability. The module's compact internal structure effectively utilizes space, reducing the overall size of the device and meeting the miniaturization and lightweight requirements of modern electronic devices. Simultaneously, the module possesses excellent electrical performance and mechanical strength, maintaining stable performance even in harsh working environments. Through innovative structural design and optimized material processes, it achieves highly integrated, highly reliable, and ultra-high-precision drive and control functions.

[0033] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A miniature hollow cup brushless motor servo drive and control integrated module, characterized in that, include: The outer casing houses an integrated drive and control module. This module consists of an 8mm outer diameter miniature hollow cup brushless motor output shaft with an interference fit pressed into a D-shaped output shaft, which can be used to insert an antenna to provide rotational power. The rear end of the motor output shaft is also with an interference fit pressed into a magnet support. The magnet support uses an anaerobic adhesive curing process to fix sintered neodymium iron boron permanent magnets. Together with the magnetic encoder integrated on the L-shaped PCB board, this forms a non-contact angle detection system.

2. The integrated servo drive and control module for a miniature hollow cup brushless motor according to claim 1, characterized in that, It also includes upper and lower brackets with concave and convex shapes, located inside the housing, for fixing the miniature hollow cup brushless motor and the L-shaped PCB board. The upper and lower brackets with concave and convex shapes include an upper bracket with concave and convex shapes and a lower bracket with concave and convex shapes. The upper bracket with concave and convex shapes and the lower bracket with concave and convex shapes are respectively provided with motor slots for clamping the front end of the miniature hollow cup brushless motor on the front side of the concave and convex shapes and the lower bracket with concave and convex shapes are respectively provided with L-shaped slots for clamping the L-shaped PCB board on the rear side of the concave and convex shapes and the lower bracket with concave and convex shapes.

3. The integrated servo drive and control module for a miniature hollow cup brushless motor according to claim 2, characterized in that, The upper and lower support brackets are made of PA66 plastic material with 30% glass fiber.

4. The integrated servo drive and control module for a miniature hollow cup brushless motor according to claim 1, characterized in that, The concentricity deviation between the central axis of the neodymium iron boron permanent magnet and the sensing surface of the magnetic encoder is 0.02mm, and the sensing distance is constant at 0.6-0.8mm.

5. The integrated servo drive and control module for a miniature hollow cup brushless motor according to claim 1, characterized in that, The L-shaped PCB board uses FR-4 substrate and achieves separation of signal layer and power layer through blind via + buried via process, and achieves vertical multi-layer circuit interconnection through wave soldering process.

6. The integrated servo drive and control module for a miniature hollow cup brushless motor according to claim 5, characterized in that, Wave soldering uses nitrogen gas with an oxygen content of less than 50 ppm, a peak temperature of 245℃±5℃, a soldering time of less than 3 seconds, and an IMC layer thickness of 2-4 μm at the solder joint.

7. The integrated servo drive and control module for a miniature hollow cup brushless motor according to claim 1, characterized in that, The outer shell is made of aluminum-magnesium alloy.

8. The integrated servo drive and control module for a miniature hollow cup brushless motor according to claim 2, characterized in that, The L-shaped PCB board is equipped with wire connectors, and the side walls of the upper and lower brackets have limiting grooves for engaging the wire connectors.

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