High-speed permanent magnet synchronous motor
By setting up coolant expansion and circulating pumps in the motor case, the liquid cooling system is formed, which solves the problem of difficulty controlling miniature motors after the temperature rises, and achieves higher heat dissipation efficiency and stable operation.
Patent Information
- Application Number
- CN202411550561.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-01-24
AI Technical Summary
The miniaturized and lightweight motors under the prior art are difficult to control after the temperature rises, resulting in heat expansion of components and gap changes, which leads to failure and damage to the motor.
A coolant interlayer is set up in the motor casing, and the coolant is effectively circulated through a circulation pump to form a closed liquid cooling system to reduce temperature and improve heat dissipation efficiency.
Effectively reduce the heat during the running of the motor, improve the heat dissipation efficiency, ensure the stable operation of the motor for a long time, and reduce the deformation damage caused by overheating.
Smart Images
Figure CN119362775A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of motors, and in particular to a high-speed permanent magnet synchronous motor. Background Art
[0002] At present, traditional induction motors and low-speed permanent magnet synchronous motors are widely used in industrial automation equipment and high-speed rotating tools. Although these traditional motors have good stability, they are unable to meet the needs of higher power density and faster speed response. In recent years, with the successful development of high-performance rare earth materials and the application of advanced electromagnetic design theory, it has become possible to develop higher speeds, greater output power and maintain good operating efficiency.
[0003] For the sake of convenience, motors under existing technologies usually reduce their size and integrate them into miniaturized and lightweight motors. However, the temperature of such motors is difficult to control. When the temperature rises, the components inside the motor are easily expanded due to heat, resulting in changes in the gap, which can cause the motor to fail or be damaged. Summary of the invention
[0004] In order to solve the problem that motors in the prior art usually reduce their size for convenience and integrate them into miniaturized and lightweight motors, but the temperature of such motors is difficult to control. When the temperature rises, the components inside the motor are easily expanded by heat, resulting in changes in the gap, which in turn causes the motor to fail and be damaged. The present application provides a high-speed permanent magnet synchronous motor, and the specific solution is as follows.
[0005] A high-speed permanent magnet synchronous motor, comprising a motor housing, wherein a stator and a rotor are arranged in the motor housing, wherein the stator is fixedly connected to the motor housing, the stator is arranged around the motor housing, the motor housing further comprises a front end cover and a rear end cover, a ball bearing is rotatably arranged on the front end cover, one end of the rotor is fixedly connected to the ball bearing, and the other end of the rotor is rotatably connected to the rear end cover; A coolant interlayer is provided in the hollow space inside the motor housing, and a liquid inlet pipe and a liquid outlet pipe are also provided on the motor housing. The liquid inlet pipe is used to allow coolant to flow into the coolant interlayer, and the liquid outlet pipe is used to discharge the coolant. A circulating pump is also provided between the liquid outlet pipe and the liquid inlet pipe, and one end of the circulating pump is connected to the liquid storage pipe, and the other end of the circulating pump is connected to the liquid inlet pipe.
[0006] By adopting the above technical solution, a coolant interlayer is opened in the hollow inside of the motor casing, and the coolant in the coolant interlayer is driven to flow by a circulating pump to form a closed liquid cooling system to cool the stator and rotor inside the motor casing. This enables the high-speed permanent magnet synchronous motor to have a cooling system that can effectively reduce the heat generated when the motor is running, improve the heat dissipation efficiency of the motor, ensure long-term stable operation of the motor, and reduce deformation and damage of the motor due to overheating.
[0007] Optionally, a Hall sensor assembly is provided on the rear end cover, and the Hall sensor assembly is used to detect the rotation speed of the rotor.
[0008] By adopting the above technical solution, the Hall sensor assembly can accurately detect the rotation speed of the rotor, thereby realizing effective monitoring of the motor operating status, improving the accuracy of rotor speed control, and reducing motor damage.
[0009] Optionally, an oil pipe is further provided in the motor housing, one end of the oil pipe extends out of the motor housing for introducing oil, and the oil pipe is used to discharge oil toward the ball bearing.
[0010] By adopting the above technical solution, an oil pipe is arranged inside the motor housing, one end of which extends out of the motor housing to allow oil to enter and direct the oil to the ball bearing position. The ball bearing can be lubricated without opening the motor housing, thereby effectively lubricating the ball bearing and improving the operating stability and service life of the motor.
[0011] Optionally, a bearing seat is provided in the front end cover corresponding to the ball bearing, the ball bearing is embedded in the bearing seat, an embedding groove is provided in the bearing seat corresponding to the oil pipe, the embedding groove is arranged corresponding to the position of the ball bearing and is arranged on both sides of the ball bearing, and the oil pipe is embedded in the embedding groove and aligned with the ball of the ball bearing.
[0012] By adopting the above technical solution, the bearing seat arranged in the front end cover ensures the stable embedding of the ball bearing. At the same time, the corresponding embedding groove in the bearing seat enables the oil pipe to be accurately aligned with the position of the balls on both sides of the ball bearing, thereby achieving precise lubrication and improving the operating stability and service life of the ball bearing.
[0013] Optionally, the embedding groove is arranged in an annular shape and surrounds the ball bearing, and a plurality of oil outlet holes are opened on the oil delivery pipe corresponding to the ball bearing, and the oil outlet holes are used to pass the oil.
[0014] By adopting the above technical solution, the embedding groove is arranged in a ring shape and a plurality of oil outlet holes are provided, so that oil can be discharged from multiple positions at the same time to lubricate the ball bearing, so that all positions of the ball bearing can be lubricated.
[0015] Optionally, the oil outlet hole includes a one-way through hole, and the one-way through holes are arranged at intervals around the oil delivery ring in the circumferential direction, and the oil can flow out from the one-way through hole when the oil pressure in the oil delivery pipe increases.
[0016] By adopting the above technical solution, the oil outlet hole is set as a one-way through hole and can be squeezed out only when the oil pressure increases, thereby reducing the situation where the oil is discharged too quickly from the oil outlet hole and reducing the waste of oil.
[0017] Optionally, a press oil pot is fixedly provided on the motor housing, and the press oil pot is fixedly connected to the motor housing. The bottom of the press oil pot is connected to the oil pipe, and the top of the press oil pot is detachably provided with a pot cover, and the pot cover can be removed to open the press oil pot, and the press oil pot is used to squeeze the oil into the oil pipe.
[0018] By adopting the above technical solution, the pressing oil pot is fixedly arranged on the motor housing and connected to the oil pipe through the bottom, and a pot cover is detachably arranged on the top, so that the pressing oil pot can be easily opened and closed, which is convenient for oil replenishment and replacement. The setting of the pressing oil pot simplifies the operation process of oil replenishment and improves the convenience of use. The oil can be replenished to the ball bearing by squeezing the pressing oil pot regularly, ensuring the continuous supply of lubricating oil, thereby ensuring the lubrication effect of the ball bearing.
[0019] Optionally, the oil delivery pipe is arranged through a coolant interlayer of the motor housing, and the oil delivery pipe is further provided with a cooling section in the coolant interlayer, and the cooling section is bent and coiled in the coolant interlayer.
[0020] By adopting the above technical solution and passing the oil pipe through the coolant interlayer, the oil in the oil pipe can be cooled to a certain extent, reducing the influence of the external environment on the oil entering the ball bearing after being heated and affecting the temperature of the rotor and the bearing, thereby further reducing the impact of temperature on the motor.
[0021] Optionally, a pressure pump is also provided on the motor housing, and the pressure pump is connected to the coolant interlayer and is used to pressurize the coolant.
[0022] By adopting the above technical solution, a pressure pump is arranged on the motor housing, which can pressurize the liquid in the coolant interlayer, making the flow of the coolant more stable, further increasing the cooling effect of the coolant on the motor, and at the same time, the pressure pump can increase the hydraulic pressure of the coolant and squeeze the oil pipe through the coolant interlayer, so that the oil can be discharged at the same time when the motor needs to be cooled. Because the oil will not affect the magnetic field and will not cause rust, etc., the oil can flow directly to the rotor for cooling while lubricating, further improving the cooling effect at the rotor and reducing overheating of the rotor and bearings.
[0023] Optionally, a sealing ring is further provided on the oil delivery pipe, and the sealing ring is arranged at the bearing seat, and the sealing ring is used to seal the gap where the oil delivery pipe extends into the bearing seat.
[0024] By adopting the above technical solution, a sealing ring is arranged on the oil pipeline, and the sealing ring can seal the gap, thereby reducing the leakage of coolant from the gap of the oil pipeline into the inside of the motor, and further reducing the damage to the motor.
[0025] In summary, this application has at least the following beneficial effects: 1. The present application solves the problem that in the prior art, for the sake of convenience, the size of the motor is usually reduced and the motor is integrated into a miniaturized and lightweight motor, but the temperature of this type of motor is difficult to control. After the temperature rises, the components in the motor are easily expanded by heat, resulting in changes in the gap, which in turn causes the motor to fail and be damaged. The present application sets a coolant interlayer in the motor casing and cooperates with a circulating pump to achieve effective circulation of the coolant, thereby improving the heat dissipation efficiency of the motor when running at high speed, reducing the deformation and damage caused by overheating inside the motor, and increasing the service life of the motor.
[0026] 2. The present application also provides an oil pipeline, which can deliver oil to the ball bearings, lubricate the ball bearings with the oil, and cool the ball bearings while lubricating, thereby further improving the cooling effect.
[0027] 3. The present application also reduces the temperature of the oil by passing the oil pipe through the coolant interlayer, and can also pressurize the coolant and squeeze the oil pipe to squeeze the oil, so that the oil can be discharged to cool the ball bearing when the motor is cooled, thereby further reducing the heat dissipation effect of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 It is a stereogram of this embodiment.
[0029] Figure 2 is a cross-sectional view of this embodiment.
[0030] Figure 3 is a cross-sectional view of this embodiment.
[0031] Figure 4 It is a cross-sectional view of this embodiment, which is mainly used to show the situation inside the bearing seat.
[0032] Figure 5 It is a cross-sectional view of this embodiment, mainly used to show the condition of the oil transfer ring.
[0033] Description of reference numerals: 1. Motor housing; 11. Coolant interlayer; 12. Front cover; 121. Ball bearing; 13. Rear cover; 131. Hall sensor assembly; 14. Bearing seat; 141. Embedding groove; 15. Press oil pot; 151. Pot cover; 16. Liquid inlet pipe; 17. Liquid outlet pipe; 2. Stator; 3. Rotor; 4. Circulation pump; 5. Oil delivery pipe; 51. One-way through hole; 52. Sealing ring; 53. Oil delivery ring; 6. Pressure pump. DETAILED DESCRIPTION
[0034] The present application is further described in detail below through specific embodiments in conjunction with the accompanying drawings.
[0035] A high-speed permanent magnet synchronous motor, such as Figure 1 and Figure 2 As shown, the motor housing 1 includes a stator 2 and a rotor 3, wherein the stator 2 is fixedly connected to the motor housing 1, the stator 2 is arranged around the motor housing 1, the motor housing 1 also includes a front cover 12 and a rear cover 13, a ball bearing 121 is rotatably arranged on the front cover 12, one end of the rotor 3 is fixedly connected to the ball bearing 121, and the other end of the rotor 3 is rotatably connected to the rear cover 13. In specific implementation, the stator 2 assembly includes an iron core stamped from silicon steel sheets and a three-phase winding coil embedded therein; the rotor 3 assembly uses a high-performance NdFeB permanent magnet as a magnetic field source, and is fixed to the inner wall of the rotor 3 shell made of high-strength aluminum alloy by a special adhesive, the silicon steel sheet material is selected as DW470-50 specification, and the thickness is 0.5mm; the cross-sectional area of the three-phase winding conductor is not less than 2.5 square millimeters, and the insulation grade is H; the NdFeB permanent magnet is grade N52H, and the temperature resistance reaches 220 degrees Celsius. The ball bearing 121 adopts a deep groove ball bearing 121, and the model is 61804, and the load capacity is greater than or equal to 1.5kN; the aluminum alloy material grade is 6061-T6.
[0036] like Figure 1 and Figure 2 As shown, a coolant interlayer 11 is provided in the hollow of the motor housing 1, and a liquid inlet pipe 16 and a liquid outlet pipe 17 are also provided on the motor housing 1. The liquid inlet pipe 16 is used to pass the coolant toward the coolant interlayer 11, and the liquid outlet pipe 17 is used to discharge the coolant. A circulating pump 4 is also provided between the liquid outlet pipe 17 and the liquid inlet pipe 16, and one end of the circulating pump 4 is connected to the liquid storage pipe, and the other end of the circulating pump 4 is connected to the liquid inlet pipe 16. In specific implementation, the coolant is selected from a liquid with a specific heat capacity of not less than 2000 J / (kg·K), which can be water or a water-oil mixture, which can more effectively cool the inside of the motor.
[0037] like Figure 2As shown, a Hall sensor assembly 131 is provided on the rear end cover 13, and the Hall sensor assembly 131 is used to detect the rotation speed of the rotor 3. In specific implementation, the Hall sensor assembly 131 detects the rotation speed through the magnetoelectric effect, and can detect the rotation speed of the rotor 3, reduce the situation of too fast or too slow rotation speed, and detect the abnormality of the rotor 3 in time.
[0038] like Figure 2 and Figure 3 As shown, an oil delivery pipe 5 is also provided in the motor housing 1, one end of the oil delivery pipe 5 extends out of the motor housing 1 for passing oil, and the oil delivery pipe 5 is used to pass oil toward the ball bearing 121. A bearing seat 14 is provided in the front end cover 12 corresponding to the ball bearing 121, and the ball bearing 121 is embedded in the bearing seat 14. An embedding groove 141 is provided in the bearing seat 14 corresponding to the oil delivery pipe 5. The embedding groove 141 is provided corresponding to the position of the ball bearing 121 and is provided on both sides of the ball bearing 121. The oil delivery pipe 5 is embedded in the embedding groove 141 and is aligned with the ball of the ball bearing 121. In specific implementation, the oil delivery pipe 5 can inject oil to lubricate the ball bearing 121, without opening the motor housing 1 for oil replenishment, which improves the convenience of lubrication, and can also replenish oil uninterruptedly during operation, so that the motor can operate for a long time.
[0039] like Figure 2 and Figure 4 As shown, the embedding groove 141 is arranged in an annular shape and surrounds the ball bearing 121. A plurality of oil outlet holes are opened on the oil delivery pipe 5 corresponding to the ball bearing 121, and the oil outlet holes are used to pass the oil.
[0040] like Figure 4 and Figure 5 As shown, the oil outlet includes a one-way through hole 51, which is arranged at intervals around the oil delivery ring 53. When the oil pressure in the oil delivery pipe 5 increases, the oil can flow out from the one-way through hole 51. In specific implementation, a plurality of deformable valves are used at the one-way through hole 51, and the oil can be sprayed out only when under pressure, and the oil will not be sprayed out in normal state, so that all positions on the ball bearing 121 can be lubricated.
[0041] like Figure 2 and Figure 3 As shown, a press oil pot 15 is fixedly provided on the motor housing 1, the press oil pot 15 is fixedly connected to the motor housing 1, the bottom of the press oil pot 15 is connected to the oil delivery pipe 5, and the top of the press oil pot 15 is detachably provided with a pot cover 151, the pot cover 151 can be removed to open the press oil pot 15, and the press oil pot 15 is used to squeeze the oil into the oil delivery pipe 5. In specific implementation, the press oil pot 15 is made of rubber or flexible plastic material, and when the ball bearing 121 needs to be lubricated, the press oil pot 15 can pressurize the oil to spray the oil when it is under pressure.
[0042] like Figure 3 and Figure 5As shown, the oil delivery pipe 5 is arranged through the coolant interlayer 11 of the motor housing 1, and the oil delivery pipe 5 is also provided with a cooling section in the coolant interlayer 11, and the cooling section is bent and coiled in the coolant interlayer 11. In specific implementation, the oil in the oil delivery pipe 5 can be cooled in the cooling section, reducing the situation where the oil temperature is high after output and affects the heat dissipation effect.
[0043] like Figure 2 and Figure 3 As shown, a booster pump 6 is also provided on the motor housing 1, and the booster pump 6 is connected to the coolant interlayer 11 and is used to pressurize the coolant. In specific implementation, the oil delivery pipe 5 is made of rubber material, and the booster pump 6 can not only pressurize the coolant so that the coolant can flow stably in the coolant interlayer 11, but also after the hydraulic pressure increases, the oil delivery pipe 5 can be pressurized to squeeze out the oil, and the oil can not only lubricate the ball bearing 121, but also directly contact the rotor 3 and the ball bearing 121 through the oil, so as to cool the ball bearing 121 and the rotor 3, thereby further cooling the motor when it is cooled.
[0044] like Figure 4 and Figure 5 As shown, a sealing ring 52 is also provided on the oil delivery pipe 5, and the sealing ring 52 is provided at the bearing seat 14, and the sealing ring 52 is used to seal the gap where the oil delivery pipe 5 extends into the bearing seat 14. In specific implementation, the sealing ring 52 can seal the coolant, thereby reducing the leakage of the coolant.
[0045] Working principle: The coolant interlayer 11 in the motor housing 1 can be filled with coolant and circulate in the motor housing 1 to cool the motor. At the same time, an oil pipe 5 is provided, which can not only lubricate the ball bearing 121, but also directly contact the ball bearing 121 with the rotor 3 to achieve a cooling effect.
[0046] The above are preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.
Claims
1. A high-speed permanent magnet synchronous motor, comprising a motor housing (1), wherein a stator (2) and a rotor (3) are arranged in the motor housing (1), characterized in that: The stator (2) is fixedly connected to the motor housing (1), the stator (2) is arranged around the motor housing (1), the motor housing (1) further comprises a front end cover (12) and a rear end cover (13), a ball bearing (121) is rotatably arranged on the front end cover (12), one end of the rotor (3) is fixedly connected to the ball bearing (121), and the other end of the rotor (3) is rotatably connected to the rear end cover (13); A cooling liquid interlayer (11) is provided in the hollow space inside the motor housing (1). A liquid inlet pipe (16) and a liquid outlet pipe (17) are also provided on the motor housing (1). The liquid inlet pipe (16) is used to introduce cooling liquid into the cooling liquid interlayer (11), and the liquid outlet pipe (17) is used to discharge cooling liquid. A circulating pump (4) is also provided between the liquid outlet pipe (17) and the liquid inlet pipe (16). One end of the circulating pump (4) is connected to the liquid storage pipe, and the other end of the circulating pump (4) is connected to the liquid inlet pipe (16).
2. A high-speed permanent magnet synchronous motor according to claim 1, characterized in that: The rear end cover (13) is provided with a Hall sensor assembly (131), and the Hall sensor assembly (131) is used to detect the rotation speed of the rotor (3).
3. A high-speed permanent magnet synchronous motor according to claim 1, characterized in that: An oil delivery pipe (5) is also provided in the motor housing (1), one end of the oil delivery pipe (5) protruding from the motor housing (1) for passing oil, and the oil delivery pipe (5) is used to pass oil toward the ball bearing (121).
4. A high-speed permanent magnet synchronous motor according to claim 3, characterized in that: A bearing seat (14) is provided in the front end cover (12) corresponding to the ball bearing (121); the ball bearing (121) is embedded in the bearing seat (14); an embedding groove (141) is provided in the bearing seat (14) corresponding to the oil delivery pipe (5); the embedding groove (141) is provided corresponding to the position of the ball bearing (121) and is provided on both sides of the ball bearing (121); the oil delivery pipe (5) is embedded in the embedding groove (141) and is aligned with the ball of the ball bearing (121).
5. A high-speed permanent magnet synchronous motor according to claim 4, characterized in that: The embedding groove (141) is arranged in an annular shape and surrounds the ball bearing (121); the oil delivery pipe (5) extends into the embedding groove (141) and is provided with an oil delivery ring (53); and the oil delivery pipe (5) is provided with a plurality of oil outlet holes corresponding to the ball bearing (121); the oil outlet holes are used to discharge oil.
6. A high-speed permanent magnet synchronous motor according to claim 5, characterized in that: The oil outlet hole comprises a one-way through hole (51), and the one-way through holes (51) are arranged at intervals in the circumferential direction around the oil delivery ring (53). When the oil pressure in the oil delivery pipe (5) increases, the oil can flow out from the one-way through hole (51).
7. A high-speed permanent magnet synchronous motor according to claim 6, characterized in that: The motor housing (1) is also fixedly provided with a press oil pot (15), the press oil pot (15) is fixedly connected to the motor housing (1), the bottom of the press oil pot (15) is connected to the oil delivery pipe (5), and the top of the press oil pot (15) is detachably provided with a pot cover (151), the pot cover (151) can be removed to open the press oil pot (15), and the press oil pot (15) is used to squeeze oil to pass into the oil delivery pipe (5).
8. The high-speed permanent magnet synchronous motor according to claim 6, characterized in that: The oil delivery pipe (5) is arranged through the coolant interlayer (11) of the motor housing (1), and the oil delivery pipe (5) is also provided with a cooling section in the coolant interlayer (11), and the cooling section is bent and coiled in the coolant interlayer (11).
9. A high-speed permanent magnet synchronous motor according to claim 8, characterized in that: A pressure pump (6) is also provided on the motor housing (1); the pressure pump (6) is connected to the coolant interlayer (11) and is used to pressurize the coolant.
10. The high-speed permanent magnet synchronous motor according to claim 8, characterized in that: The oil delivery pipe (5) is also provided with a sealing ring (52), which is arranged at the bearing seat (14) and is used to seal the gap where the oil delivery pipe (5) extends into the bearing seat (14).