High-rigidity and low-vibration outer rotor grinding wheel spindle motor and outer rotor grinding wheel

Abstract

The utility model provides a high rigidity, low vibration's outer rotor grinding wheel main shaft motor, including the casing that is equipped with containing space, the outer rotor subassembly that sets up on the inner wall of casing, the motor main shaft that sets up in containing space and the stator subassembly that sets up on motor main shaft, casing is equipped with cooling device, cooling device includes the air inlet channel that sets up on motor main shaft and sends air to the side of stator subassembly outside stator subassembly, the air outlet channel that sets up on the other side of stator subassembly and sends air out casing and the connecting cavity for realizing the cooling gas flow circulation between outer rotor subassembly and stator subassembly, the utility model sets up air inlet channel on the side of stator subassembly, is used for sucking air into casing, provides cooling air current for the cooling of stator subassembly, and sets up connecting cavity between outer rotor subassembly and stator subassembly, realizes the guidance to cooling air current, finally discharges the air in casing in the air outlet channel of the other side of stator subassembly.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically to a high-rigidity, low-vibration external rotor grinding wheel spindle motor and an external rotor grinding wheel. Background Technology

[0002] As a core power component of CNC machine tools, machining centers, and other equipment, the spindle motor's operational stability directly determines machining accuracy and production efficiency. Driven by the upgrading of intelligent manufacturing and precision machining industries, spindle motors are gradually developing towards higher speeds and higher power.

[0003] However, the resulting heat generation problem has become a key bottleneck restricting its performance. Currently, there are three main methods for cooling spindle motors: First, natural cooling is only suitable for low-power motors with low speeds, and its heat dissipation efficiency is insufficient, which cannot meet the needs of medium and high-speed scenarios. Second, although forced air cooling can improve heat dissipation efficiency, the high-speed operation of the fan will generate additional noise, and the dust carried by the airflow is easy to adhere to the winding surface, which will lead to a decrease in heat dissipation capacity after long-term use. Third, liquid cooling is currently the mainstream solution for medium and high-power motors. Water cooling systems have high heat dissipation efficiency, but they require auxiliary equipment such as water pumps and heat exchangers, resulting in high system complexity and the risk of short circuits caused by water leakage in the pipeline. Oil cooling media usually have good insulation properties, but the viscosity of the oil changes with temperature, which will affect the circulation efficiency, and the oil stains are difficult to clean, resulting in high maintenance costs. Utility Model Content

[0004] This invention aims to solve the problems existing in the prior art by providing a high-rigidity, low-vibration external rotor grinding wheel spindle motor, which can effectively dissipate the heat generated during motor operation, control thermal deformation, and ensure the thermal stability and long-term operating accuracy of the spindle.

[0005] The technical solution adopted by this utility model to solve its technical problem is as follows: a high-rigidity, low-vibration external rotor grinding wheel spindle motor, comprising a housing with an internal accommodating space, an external rotor assembly disposed on the inner wall of the housing, a motor spindle disposed within the accommodating space, and a stator assembly disposed on the motor spindle. The housing is characterized by having a cooling device for dissipating heat from the stator assembly. The cooling device includes an air inlet channel disposed on the motor spindle and supplying air from outside the stator assembly to one side of the stator assembly, an air outlet channel disposed on the other side of the stator assembly and supplying air out of the housing, and a connecting cavity connecting the air inlet channel and the air outlet channel and for enabling the flow of cooling gas between the external rotor assembly and the stator assembly.

[0006] This application uses an intake channel to draw cooling air into the housing, providing sufficient cooling airflow for the stator assembly. The connecting cavity guides the air entering the housing, allowing it to contact the stator assembly and thus cool it. The exhaust channel provides a path for the air to exit. The intake channel, connecting cavity, and exhaust channel together form a complete airflow circuit, achieving effective convection of internal and external air. This ensures that the stator assembly remains within a suitable temperature range during operation, thereby improving the performance stability of the motor.

[0007] Preferably, the housing includes a rotor housing for mounting the rotor assembly and end caps mounted at both ends of the rotor housing for rotatable connection with the motor spindle. The end caps include a fixed end mounted on the rotor housing and a support sleeve connected to the fixed end and arranged parallel to the motor spindle. A bearing assembly mounted on the outside of the motor spindle is provided inside the support sleeve. A heat-insulating limiting part is provided on the inner end of the support sleeve for limiting the bearing assembly. An annular preload member is provided on the outside of the bearing assembly, mounted inside the support sleeve and in contact with the outer side of the motor spindle. A plurality of wedge-shaped flanges protruding at intervals toward one side of the motor spindle axis are provided inside the support sleeve outside the bearing assembly. The annular preload member is provided with wedge-shaped grooves corresponding to the flanges. By rotating the annular preload member relative to each other, the wedge-shaped grooves and wedge-shaped flanges move relative to each other to generate lifting tension, thereby achieving preload. The rotor housing houses and secures the rotor assembly, providing a stable internal space. End caps connect both ends of the rotor housing and are rotatably connected to the motor shaft, protecting the components within and supporting the rotor to maintain a certain distance between the stator and rotor for stable operation. A fixed end is mounted on the rotor housing, connected to a support sleeve parallel to the motor shaft, with an internal bearing assembly reducing rotational friction between the rotor assembly and the motor shaft. A heat-insulating limiting part is installed inside the support sleeve to prevent radial movement of the bearing assembly during operation, serving both limiting and heat dissipation functions. An annular preload member is installed inside the support sleeve and contacts the outer surface of the motor shaft for preloading the bearing assembly. Wedge-shaped flanges are spaced apart inside the support sleeve; by rotating the annular preload member relative to each other, the wedge-shaped grooves and flanges shift, generating lifting tension to preload the bearing assembly, ensuring stable operation of the motor under high speed and high load, while also improving motor efficiency and service life.

[0008] Preferably, the air intake channel includes an air inlet located at the left end of the motor spindle, an opening on the motor spindle and located on the left side of the stator assembly, and an intermediate channel between the air inlet and the opening. The air inlet, located at the left end of the motor spindle, is directly connected to the outside air, allowing outside air to directly enter the motor. The opening on the motor spindle, near the left end of the stator assembly, allows cooling air to be precisely concentrated in the heat source area of ​​the motor. The intermediate channel, located between the air inlet and the opening, serves as a connecting path, effectively connecting the air inlet to the opening on the motor spindle. This ensures that air can continuously and smoothly flow in from the air inlet, through the motor, and out from the opening, avoiding obstructions in airflow, enhancing its smoothness, and improving overall cooling efficiency.

[0009] Preferably, the air outlet channel is a through hole formed on the right end cover and connected to the outside, the through hole passing sequentially through the heat insulation limiting part and the wedge-shaped flange part. Providing a through hole on the right end cover, and having the through hole pass sequentially through the heat insulation limiting part and the wedge-shaped flange part, allows airflow to pass smoothly through the narrow space, avoiding airflow obstruction and local pressure increase, thereby reducing the concentration of high-pressure gas inside the casing.

[0010] Preferably, the left end of the motor spindle has an inner mounting channel extending towards the inner end of the stator assembly. A temperature sensor is installed within this mounting channel to detect and report the operating temperature of the motor. By providing a mounting channel and a temperature sensor on the left end of the motor spindle, real-time temperature monitoring of the motor during operation is achieved, and the data is fed back to relevant systems for timely temperature adjustment.

[0011] A high-rigidity, low-vibration external rotor grinding wheel spindle motor has an external rotor grinding wheel integrally formed on the outer side of the housing. The housing and the grinding wheel are directly integrated to form the main rotational inertia body, shortening the transmission chain and improving rigidity and response speed.

[0012] Preferably, the device further includes a grinding wheel frame for supporting and mounting the external rotor grinding wheel spindle motor. The grinding wheel frame includes a support frame with an inner rotating cavity, a mounting port on one side of the support frame for detachably mounting the motor spindle and stator assembly, and a disassembly bracket mounted on the outside of the motor spindle and located within the mounting port, detachably connected to the support frame. The support frame with the inner rotating cavity supports the grinding wheel spindle motor; the mounting port serves as a mounting channel for the motor spindle and stator assembly, facilitating the installation and disassembly of the motor spindle and stator assembly; the disassembly bracket is mounted on the outside of the motor spindle, fixed to the mounting port, and detachably connected to the support frame, enhancing the overall stability and maintainability of the machine.

[0013] Preferably, the mounting port is a C-shaped arc opening, and the disassembly bracket is provided with a support limiting part that supports and limits the installation within the mounting port. The C-shaped arc opening of the mounting port can utilize its arc-shaped guiding effect to achieve accurate alignment of the mounting position; the support limiting part on the disassembly bracket located within the mounting port is used to support and limit the grinding wheel frame, which can prevent unnecessary movement or loosening and ensure the stability and reliability of the grinding wheel frame.

[0014] The beneficial effects of this utility model are as follows: An air inlet channel is provided on one side of the stator assembly to draw outside air into the housing, thereby providing cooling airflow for the stator assembly. An air outlet channel on the other side of the stator assembly provides a path for air discharge, ensuring that the cooled air does not remain inside the housing and form an internal circulation. A connecting channel is provided between the outer rotor assembly and the stator assembly to guide the cooling airflow, ensuring that the cooling air can directly contact and cool the stator assembly. The air inlet channel, connecting cavity, and air outlet channel together constitute a complete airflow circuit, enabling continuous air circulation, improving the motor's heat dissipation effect, and ensuring that the motor remains at a relatively ideal temperature during operation. This improves the motor's performance stability, reduces the impact of high temperatures, and extends the motor's service life. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is an exploded view of the grinding wheel frame of this utility model; Figure 3 This is a schematic diagram of the spindle motor of this utility model; Figure 4 This is a cross-sectional view of the spindle motor of this utility model.

[0016] Figure descriptions: 1. Motor spindle; 11. Bearing assembly; 12. Heat insulation limiting part; 13. Annular preload part; 131. Wedge-shaped groove; 14. Wedge-shaped flange; 15. Mounting channel; 151. Temperature sensor; 2. Outer rotor assembly; 3. Housing; 31. Rotor housing; 32. End cover; 321. Fixed end; 322. Support sleeve; 4. Stator assembly; 5. Cooling device; 51. Air inlet channel; 511. Air inlet; 512. Opening; 513. Intermediate channel; 52. Air outlet channel; 521. Through hole; 53. Connecting cavity; 6. Grinding wheel; 7. Grinding wheel holder; 71. Support frame; 72. Mounting port; 73. Disassembly bracket; 731. Support limiting part. Detailed Implementation

[0017] To further illustrate the technical means and effects of this utility model in achieving its intended purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model, in conjunction with the accompanying drawings and preferred embodiments, is provided below.

[0018] Combination Figure 1 and Figure 4 As shown, a high-rigidity, low-vibration external rotor grinding wheel spindle motor includes a housing 3 with an internal accommodating space, an external rotor assembly 2 disposed on the inner wall of the housing 3, a motor spindle 1 disposed within the accommodating space, and a stator assembly 4 disposed on the motor spindle 1. The housing 3 is characterized by a cooling device 5 for dissipating heat from the stator assembly 4. The cooling device 5 includes an air inlet channel 51 disposed on the motor spindle 1 and supplying air from outside the stator assembly 4 to one side of the stator assembly 4, an air outlet channel 52 disposed on the other side of the stator assembly 4 and supplying air out of the housing 3, and a connecting cavity 53 connecting the air inlet channel 51 and the air outlet channel 52 and facilitating the flow of cooling gas between the external rotor assembly 2 and the stator assembly 4.

[0019] This application provides an air intake channel 51 on one side of the stator assembly 4 to draw outside air into the housing 3, thereby providing cooling airflow for the stator assembly 4. An air outlet channel 52 on the other side of the stator assembly 4 provides a path for air to be discharged, preventing air from circulating inside the motor. A connecting cavity 53 is provided between the outer rotor assembly 2 and the stator assembly 4 to guide the cooling airflow, ensuring that the cooling air can directly contact and cool the stator assembly 4. Thus, the air intake channel 51, the connecting channel, and the air outlet channel 52 together form a complete airflow circuit, enabling continuous air circulation, improving the motor's heat dissipation effect, and keeping the motor at a relatively ideal temperature during operation. This improves the motor's performance stability, reduces the impact of high temperatures, and extends the motor's service life. When the motor rotates, the outer rotor rotates around the stator assembly 4. The stator assembly 4 generates a large amount of heat due to electromagnetic induction. Cool air from the outside can enter through the air intake channel 51 and flow around the stator assembly 4. The heated air flows through the connecting cavity 53 to one end of the air outlet channel 52 and is discharged to the outside through the air outlet channel 52. During the heat dissipation process, the heated air can pass through the gap between the outer rotor assembly 2 and the stator assembly 4 to the air outlet channel 52, or it can pass directly through the gap on the stator assembly 4 to the air outlet channel 52.

[0020] The housing 3 and the motor spindle 1 are connected by bearings, and the specific structure in this application is as follows: Figure 4As shown, the housing 3 includes a rotor housing 31 for mounting the rotor assembly and end caps 32 mounted at both ends of the rotor housing 31 for rotatable connection with the motor spindle 1. The end caps 32 include a fixed end 321 mounted on the rotor housing 31 and a support sleeve 322 connected to the fixed end 321 and arranged parallel to the motor spindle 1. The support sleeve 322 is provided with a bearing assembly 11 mounted on the outside of the motor spindle 1. The rotor housing 31 is provided with a bearing assembly 11 mounted on the inner end of the support sleeve 322 for limiting the setting of the bearing assembly 11. The heat-insulating limiting part 12 and the bearing assembly 11 are provided with an annular pre-tightening member 13 installed inside the support sleeve 322 and in contact with the outer side of the motor main shaft 1. The support sleeve 322 outside the bearing assembly 11 has a number of wedge-shaped flanges 14 that protrude toward one side of the axis of the motor main shaft 1 at intervals. The annular pre-tightening member 13 has a wedge-shaped groove 131 that corresponds to the flange. By rotating the annular pre-tightening member 13 relative to each other, the wedge-shaped grooves 131 and the wedge-shaped flanges 14 are offset to generate lifting tension, thereby achieving pre-tightening. In addition, the housing 3 and the motor main shaft 1 can also be of the air suspension type, dynamic and static pressure type, etc.

[0021] In this application, the rotor housing 31 serves as a protective cover for the electric spindle, housing and protecting core components such as the rotor assembly and bearing assembly 11, while also providing shock absorption and sound insulation. End caps 32 are connected to both ends of the rotor housing 31 and rotatably connected to the motor spindle 1, protecting the components within the rotor housing 31 and supporting the rotor, maintaining a certain distance between the stator and rotor to achieve stable operation. A fixed end 321 is mounted on the rotor housing 31, and a support sleeve 322 is connected to the fixed end 321 and arranged parallel to the motor spindle 1, used to install the bearing assembly 11. The bearing assembly 11 housed within the support sleeve 322 reduces rotational friction between the rotor assembly and the motor spindle 1. The heat-limiting part 12 is installed at the inner end of the support sleeve 322 to prevent the bearing assembly 11 from moving radially during operation, thus serving as a limit and heat dissipation function. The annular preload part 13 is installed inside the support sleeve 322 and contacts the outer side of the motor main shaft 1 to preload the bearing assembly 11. The wedge-shaped flange part 14 is spaced apart inside the support sleeve 322. By rotating the annular preload part 13 relative to each other, the wedge-shaped groove 131 and the wedge-shaped flange part 14 are offset from each other, generating lifting tension, which in turn preloads the bearing assembly 11. This effectively avoids loosening problems caused by vibration and temperature changes, ensures stable operation of the motor under high speed and high load, and improves the working efficiency and service life of the motor.

[0022] Combination Figure 4As shown, the air intake channel 51 includes an air intake 511 located at the left end of the motor spindle 1, an opening 512 located on the motor spindle 1 and on the left side of the stator assembly 4, and an intermediate channel 513 located between the air intake 511 and the opening 512. The air intake 511 is located at the left end of the motor spindle 1 and is directly connected to the outside air, allowing outside air to directly enter the motor. The opening 512 is located on the motor spindle 1 near the left end of the stator assembly 4, allowing cooling air to be precisely concentrated in the heat source area of ​​the motor. The intermediate channel 513 is located between the air intake 511 and the opening 512, serving as a connection path between the two. It effectively connects the air intake 511 and the opening 512 on the motor spindle 1, ensuring that air can continuously and smoothly flow in from the air intake 511, pass through the motor, and exit from the opening 512, avoiding obstructions in airflow, enhancing the smoothness of its flow, and improving the overall cooling efficiency.

[0023] Combination Figure 3 and Figure 4 As shown, the air outlet channel 52 is a through hole 521 opened on the right end cover 32 and connected to the outside. The through hole 521 passes through the heat insulation limiting part 12 and the wedge-shaped flange part 14 in sequence. The through hole 521 is provided on the right side of the end cover 32, and the through hole 521 passes through the heat insulation limiting part 12 and the wedge-shaped flange part 14 in sequence, so that the airflow can pass smoothly through the narrow space, avoiding the problems of airflow obstruction and local pressure increase, thereby reducing the concentration of gas in the shell 3.

[0024] When the motor is running, the treated cooling air from the outside enters through the air inlet 511, is introduced into the housing 3 through the intermediate channel 513 and exits through the opening 512 into the left side of the receiving space, and then cools the stator assembly 4 through the connecting channel. The air passing through the stator assembly 4 enters the right side of the receiving space and is discharged to the outside through the through hole 521.

[0025] Combination Figure 4 As shown, a mounting channel 15 extending to the inner end of the stator assembly 4 is provided on the inner side of the left end of the motor spindle 1. A temperature sensor 151 is installed in the mounting channel 15 to detect and report the operating temperature of the motor. By setting the mounting channel 15 on the left end of the motor spindle 1 and installing the temperature sensor 151 in the mounting channel 15, real-time acquisition of the motor's operating temperature is achieved.

[0026] In this application, the temperature sensor 151 and the cooling device 5 can be associated through a control system or the like. When the motor is running, the temperature sensor 151 collects and monitors the motor temperature in real time. When the motor temperature exceeds a set threshold, the temperature sensor 151 feeds back to the control system, which then issues a command to the cooling device 5. The cooling device 5 then dissipates heat and cools the motor, thereby controlling the motor temperature and effectively preventing motor failures and extending the motor's service life.

[0027] Combination Figure 1 and Figure 2 As shown, a grinding wheel 6 is integrally formed with the housing 3 on the outer side of the spindle motor housing 3. The housing 3 and the grinding wheel 6 are directly integrated to form the main rotational inertia body, which shortens the transmission chain and helps to improve rigidity and response speed.

[0028] Combination Figure 1 As shown, the external rotor grinding wheel includes a grinding wheel frame 7 for supporting and mounting the external rotor grinding wheel spindle motor. The grinding wheel frame 7 includes a support frame 71 with a rotating cavity on its inner side, a mounting port 72 on one side of the support frame 71 for detachably mounting the motor spindle 1 and stator assembly 4, and a disassembly bracket 73 mounted on the outside of the motor spindle 1 and located inside the mounting port 72, detachably connected to the support frame 71. The support frame 71 with a rotating cavity on its inner side supports the grinding wheel spindle motor; the mounting port 72 serves as a mounting channel 15 for the motor spindle 1 and stator assembly 4, facilitating the installation and disassembly of the motor spindle 1 and stator assembly 4; the disassembly bracket 73 is mounted on the outside of the motor spindle 1, fixed to the mounting port 72, and detachably connected to the support frame 71, enhancing the stability and maintainability of the entire machine.

[0029] Combination Figure 2 As shown, the mounting port 72 is a C-shaped arc opening 512, and the disassembly bracket 73 is provided with a support limiting part 731 that supports and limits the installation within the mounting port 72. The C-shaped arc opening 512 of the mounting port 72 can be used to accurately align the installation position by utilizing its arc-shaped guiding effect; the support limiting part 731 on the disassembly bracket 73 located within the mounting port 72 is used to support and limit the grinding wheel frame 7, which can prevent unnecessary movement or loosening and ensure the stability and reliability of the grinding wheel frame 7.

[0030] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A high-rigidity, low-vibration external rotor grinding wheel spindle motor, comprising a housing (3) with an internal accommodating space, an external rotor assembly (2) disposed on the inner wall of the housing (3), a motor spindle (1) disposed within the accommodating space, and a stator assembly (4) disposed on the motor spindle (1), characterized in that, The housing (3) is provided with a cooling device (5) for dissipating heat from the stator assembly (4). The cooling device (5) includes an air inlet channel (51) provided on the motor spindle (1) and sending air from outside the stator assembly (4) to one side of the stator assembly (4), an air outlet channel (52) provided on the other side of the stator assembly (4) and sending air out of the housing (3), and a connecting cavity (53) connecting the air inlet channel (51) and the air outlet channel (52) and for realizing the passage of cooling airflow between the outer rotor assembly (2) and the stator assembly (4).

2. The high-rigidity, low-vibration external rotor grinding wheel spindle motor according to claim 1, characterized in that, The housing (3) includes a rotor housing (31) for mounting the rotor assembly and end caps (32) mounted at both ends of the rotor housing (31) for rotatably connecting with the motor spindle (1). The end caps (32) include a fixed end (321) mounted on the rotor housing (31) and a support sleeve (322) connected to the fixed end (321) and arranged parallel to the motor spindle (1). The support sleeve (322) is provided with a bearing assembly (11) mounted on the outside of the motor spindle (1). The rotor housing (31) is provided with a bearing assembly (11) mounted on the inner end of the support sleeve (322) for limiting the bearing assembly (11). The heat insulation limiting part (12) is provided on the outside of the bearing assembly (11) and an annular pre-tightening part (13) is installed in the support sleeve (322) and in contact with the outer side of the motor main shaft (1). The support sleeve (322) on the outside of the bearing assembly (11) is provided with a number of wedge-shaped flanges (14) that protrude toward the axis of the motor main shaft (1) at intervals. The annular pre-tightening part (13) is provided with a wedge-shaped groove (131) corresponding to the flange. By rotating the annular pre-tightening part (13) relative to each other, the wedge-shaped groove (131) and the wedge-shaped flange (14) move to each other to generate lifting tension and thus achieve pre-tightening.

3. The high-rigidity, low-vibration external rotor grinding wheel spindle motor according to claim 2, characterized in that, The air intake channel (51) includes an air intake (511) at the left end of the motor spindle (1), an opening (512) on the motor spindle (1) and located on the left side of the stator assembly (4), and an intermediate channel (513) between the air intake (511) and the opening (512).

4. The high-rigidity, low-vibration external rotor grinding wheel spindle motor according to claim 2, characterized in that, The air outlet channel (52) is a through hole (521) opened on the right end cap (32) and connected to the outside. The through hole (521) passes through the heat insulation limiting part (12) and the wedge-shaped flange part (14) in sequence.

5. A high-rigidity, low-vibration external rotor grinding wheel spindle motor according to claim 1, characterized in that, The motor spindle (1) has an inner side on the left end with an installation channel (15) that extends to the inner end of the stator assembly (4). A temperature sensor (151) is provided in the installation channel (15). The temperature sensor (151) is used to detect and provide feedback on the operating temperature of the motor.

6. A high-rigidity, low-vibration external rotor grinding wheel spindle motor according to any one of claims 1-5, characterized in that, A grinding wheel (6) is integrally formed on the outer side of the housing (3).

7. A high-rigidity, low-vibration external rotor grinding wheel spindle motor according to claim 6, characterized in that, It also includes a grinding wheel frame (7) for supporting and mounting an external rotor grinding wheel spindle motor. The grinding wheel frame (7) includes a support frame (71) with a rotating cavity on the inner side, a mounting port (72) on one side of the support frame (71) for detachably mounting the motor spindle (1) and stator assembly (4), and a disassembly bracket (73) mounted on the outside of the motor spindle (1) and located inside the mounting port (72) and detachably connected to the support frame (71).

8. A high-rigidity, low-vibration external rotor grinding wheel spindle motor according to claim 7, characterized in that, The mounting port (72) is a C-shaped arc opening, and the disassembly bracket (73) is provided with a support limiting part (731) that supports and limits the mounting port (72).

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