A compact interference-resistant electric motor

Abstract

The utility model discloses a compact anti -interference motor, including upper end cover, casing, lower end cover and height integration PCB board, and upper end cover casing and lower end cover constitute motor shell, provide mechanical support and seal, the inner wall of casing upper portion is equipped with and is equipped with integration terminal seat, one end of height integration PCB board is equipped with copper bar, is opened with the mounting hole of terminal seat matching on copper bar, the decoding chip is integrated on height integration PCB board, and the decoding chip is located the just above motor rotor, the wiring hole post that is matched with terminal seat is equipped on the upper baffle, and the upper baffle, height integration PCB board and terminal seat are locked through the nut. The utility model has realized the high compactness of motor structure and the digitization of signal transmission, has improved anti -interference performance and reliability significantly. The design is especially suitable for electric automobile, industrial robot, unmanned plane etc. to the space sensitive and complex electromagnetic environment scene, has extensive market application prospect.

Description

Technical Field

[0001] This utility model belongs to the field of motor structure design technology, specifically relating to a compact motor that eliminates the resolver line, improves anti-interference capability, and reduces cost through highly integrated design. Background Technology

[0002] In traditional electric motors, a resolver is typically used to connect the resolver to the electronic control system to transmit rotor position and speed signals. However, this structure has the following drawbacks:

[0003] The signal is susceptible to interference: the analog signal (sine / cosine) output by the rotary transformer is sensitive to electromagnetic interference, especially in strong electromagnetic environments (such as electric vehicle drive systems) where it is prone to errors.

[0004] The system is highly complex: additional signal conditioning circuits (such as filtering and amplification) are required to compensate for signal attenuation over long distances, increasing hardware costs and debugging difficulty;

[0005] Size and cost limitations: Rotary transformers and high-shield resolver wires are large and expensive, making them difficult to adapt to miniaturized equipment (such as drones and robots).

[0006] Maintenance difficulties: The resolver is prone to open circuit due to vibration and aging, and troubleshooting requires disassembling the motor, resulting in low maintenance efficiency.

[0007] To address the aforementioned issues, this invention proposes a highly integrated motor structure that eliminates the resolver line, thereby enhancing anti-interference capabilities and optimizing spatial layout. Summary of the Invention

[0008] The purpose of this invention is to provide a compact anti-interference motor to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, this utility model provides the following technical solution: a compact anti-interference motor, comprising an upper end cover, a housing, a lower end cover, and a highly integrated PCB board, wherein the upper end cover, housing, and lower end cover constitute the motor housing, providing mechanical support and sealing;

[0010] An integrated terminal block is provided on the inner wall of the upper part of the housing, and a copper busbar is provided at one end of the highly integrated PCB board, with mounting holes that match the terminal block on the copper busbar;

[0011] A decoding chip is integrated on the highly integrated PCB board, and the decoding chip is located directly above the motor rotor;

[0012] The upper cover plate is provided with wiring hole posts that match the terminal block, and the upper cover plate, highly integrated PCB board and terminal block are locked together by nuts.

[0013] Preferably, the electronic rotor has a built-in permanent magnet, and its magnetic field changes are directly captured by the decoding chip, eliminating the need for a rotary transformer and a resolver.

[0014] Preferably, the decoding chip is soldered to a highly integrated PCB board and directly outputs digital signals to the control system.

[0015] Preferably, an insulated gate bipolar transistor (IGBT), a resistor, and a decoding chip are integrated on the highly integrated PCB board.

[0016] Preferably, a plurality of heat dissipation teeth are provided at equal intervals on the outer surface of the end cap body, the spacing between the heat dissipation teeth being 4-6mm and the height being 5-10mm.

[0017] The technical effects and advantages of this utility model are as follows:

[0018] 1. By directly capturing the magnetic field changes of the permanent magnet built into the motor rotor through the decoding chip on the highly integrated PCB board, the need for a resolver and resolver wire is eliminated, thereby effectively avoiding electromagnetic interference and improving the accuracy and stability of the signal.

[0019] 2. By highly integrating components such as terminal blocks, decoding chips, IGBTs, and resistors onto the PCB board, the motor structure is simplified, the number of components and connecting lines is reduced, thereby lowering manufacturing costs. At the same time, the highly integrated design also optimizes space layout, making the motor more compact.

[0020] 3. By eliminating the resolver wire, the number of potential failure points due to vibration and aging is reduced, improving system reliability. Furthermore, the highly integrated PCB design reduces failures caused by loose components or poor connections, further enhancing the motor's stability and durability.

[0021] 4. Multiple heat dissipation dents are evenly spaced on the outer surface of the upper end cover. These dents effectively increase the heat dissipation area and improve heat dissipation efficiency. This is crucial for ensuring the normal operation of the motor in high-temperature environments and also helps extend the motor's service life. Attached Figure Description

[0022] Figure 1 This is a schematic diagram (exploded view) of the structure of this utility model;

[0023] Figure 2 This is a cross-sectional view of the present invention;

[0024] Figure 3 This is a rear view of a highly integrated PCB board.

[0025] In the diagram: Top cover-1, Housing-2, Bottom cover-3, Highly integrated PCB board-4, Terminal block-5, Copper busbar-6, Mounting hole-7, Decoding chip-8, Electronic rotor-9, Wiring hole post-10, Nut-11, Heat dissipation teeth-12. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] The following is in conjunction with the appendix Figure 1-3 This paper provides a detailed description of specific embodiments of the compact anti-interference motor of this invention. While this embodiment uses an electric vehicle drive motor as an application scenario, the structure of this invention is also applicable to fields with high requirements for space and anti-interference capabilities, such as industrial robots and drones.

[0028] Motor structure assembly:

[0029] Install the outer casing assembly, vertically fix the casing 2 to the assembly platform, ensure that the integrated terminal block 5 on its inner wall faces directly upward, and connect the lower end cover 3 to the bottom of the casing 2 with bolts to form a sealed structure for the lower half of the motor.

[0030] For the installation of the highly integrated PCB board, insert the copper busbar 6 of the highly integrated PCB board 4 into the terminal block 5 on the inner wall of the housing 2, ensuring that the mounting hole 7 on the copper busbar is aligned with the screw hole of the terminal block. Use an M4 bolt to pass through the mounting hole 7 and tighten it to form a rigid connection between the highly integrated PCB board 4 and the terminal block 5.

[0031] The upper cover is fixed to the wiring. The wiring hole post 10 of the upper cover 1 is aligned with the reserved through hole of the highly integrated PCB board 4, and locked by the nut 11, so that the upper cover 1, the highly integrated PCB board 4 and the terminal block 5 are fixed as one.

[0032] Check the compatibility of the wiring terminal 10 with the wiring terminals of the external electrical control system to ensure that the signal transmission path is not offset.

[0033] Install the motor rotor 9 with built-in permanent magnet into the bearing position inside the housing 2, ensuring that the rotor axis is strictly aligned with the geometric center of the decoding chip 8 (coaxiality error ≤ 0.1mm); after powering on, use an oscilloscope to detect the digital signal output by the decoding chip 8, and adjust the rotor position until the signal amplitude is stable.

[0034] Among them, the decoding chip 8 uses an RDC (Resolver-to-Digital Converter) chip, which is directly soldered onto the highly integrated PCB board 4. Its input end captures the magnetic field changes of the rotor 9 through a miniature induction coil. The chip converts the analog magnetic field signal into a 14-bit digital angle signal (resolution up to 0.022°) and outputs it to the electronic control system through the SPI interface.

[0035] An insulated gate bipolar transistor (IGBT) and a current-limiting resistor are simultaneously soldered on a highly integrated PCB board 4 to form a compact drive circuit; the IGBT module is connected to an external power supply through a copper busbar 6, and the drive current can reach 50A, supporting a peak motor power of 15kW;

[0036] The outer surface of the upper cover 1 is machined with aluminum alloy heat dissipation teeth 12 at equal intervals. The tooth spacing is 5mm and the tooth height is 8mm. The surface is sprayed with thermal conductive silicone grease to enhance the heat radiation efficiency. In actual tests, under full load conditions, the motor temperature rise is reduced by 20% compared with the traditional structure, and the surface temperature of the heat dissipation teeth is ≤85℃.

[0037] The compact anti-interference motor of this invention has the advantages of small size, low cost and strong anti-interference ability, and is very suitable for occasions with strict space requirements and severe electromagnetic interference, such as electric vehicle drive systems, drones, robots and other fields.

[0038] Anti-interference and reliability verification:

[0039] 1. Electromagnetic compatibility testing

[0040] In the simulated environment of electric vehicle drive system (EMI intensity ≥ 100V / m), the digital signal fluctuation rate output by the decoding chip 8 is < 1%, which is far lower than the 10% error threshold of traditional analog signals; after eliminating the resolver, the signal transmission path is shortened to less than 50mm, avoiding common-mode interference introduced by long cables.

[0041] 2. Mechanical vibration test

[0042] Random vibration tests (frequency 10-2000Hz, acceleration 10g) were conducted according to GB / T 2423.10 standard. After 2 hours, there was no looseness at the connection between the highly integrated PCB board 4 and the terminal block 5, and the decoded signal was normal.

[0043] 3. Environmental adaptability verification

[0044] The highly integrated PCB board 4 is sealed using a potting process (epoxy resin, 2mm thick), and has passed the IP67 protection level test, enabling it to operate stably in environments ranging from -40℃ to 125℃.

[0045] The applicant further declares that while the above embodiments illustrate the implementation method and apparatus structure of this utility model, this utility model is not limited to the above-described embodiments, meaning that this utility model must rely on the above methods and structures to be implemented. Those skilled in the art should understand that any improvements to this utility model, equivalent substitutions for the selected implementation methods, additions of steps, and selection of specific methods all fall within the protection and disclosure scope of this utility model.

[0046] This utility model is not limited to the above-described embodiments. All methods that use similar structures and methods to achieve the purpose of this utility model are within the protection scope of this utility model.

Claims

1. A compact anti-interference motor, characterized in that: It includes an upper end cover (1), a housing (2), a lower end cover (3) and a highly integrated PCB board (4). The upper end cover (1), the housing (2) and the lower end cover (3) constitute the motor housing, providing mechanical support and sealing. An integrated terminal block (5) is provided on the inner wall of the upper part of the housing (2), and a copper busbar (6) is provided at one end of the highly integrated PCB board (4). Mounting holes (7) matching the terminal block (5) are opened on the copper busbar (6). A decoding chip (8) is integrated on the highly integrated PCB board (4), and the decoding chip (8) is located directly above the motor rotor (9); The upper end cover (1) is provided with wiring hole posts (10) that match the terminal block (5), and the upper end cover (1), the highly integrated PCB board (4) and the terminal block (5) are locked by nuts (11).

2. The compact anti-interference motor according to claim 1, characterized in that: The motor rotor (9) has a built-in permanent magnet, and its magnetic field changes are directly captured by the decoding chip (8), without the need for a rotary transformer and a resolver.

3. A compact anti-interference motor according to claim 1, characterized in that: The decoding chip (8) is soldered to the highly integrated PCB board (4) and directly outputs digital signals to the control system.

4. A compact anti-interference motor according to claim 1, characterized in that: An insulated gate bipolar transistor (IGBT), a resistor, and a decoding chip (8) are integrated on the highly integrated PCB board (4).

5. A compact anti-interference motor according to claim 1, characterized in that: Multiple heat dissipation teeth (12) are provided at equal intervals on the outer surface of the upper end cover (1). The spacing between the heat dissipation teeth (12) is 4-6mm and the height is 5-10mm.

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