High-speed brushless motor
By adopting a two-way fan synchronous rotation and cooling air duct structure in a brushless motor, the problem of low heat dissipation efficiency in the prior art is solved, and a more efficient heat dissipation effect is achieved, reducing the heating risk of the motor under high load conditions.
Patent Information
- Application Number
- CN202420972588.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-07
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-05-07
AI Technical Summary
The existing brushless motors have low heat dissipation efficiency, especially in high loads or short circuits, which lead to serious heat generation problems.
A high-speed brushless motor is designed, adopting a heat dissipation structure with two-way fans synchronously rotating. By setting up a suction fan and an exhaust fan at both ends of the motor housing, and a cooling air duct and a heat dissipation plate in the motor housing, the cooling air is cooled. The air absorbs heat through the heat dissipation plate and is discharged, improving the air flow and heat dissipation efficiency.
It effectively improves the air flow and heat dissipation efficiency inside the motor, enhances the heat dissipation ability of the motor under high load conditions, and reduces the risk of heating.
Smart Images
Figure CN222215431U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of brushless motors, in particular to a high-speed brushless motor. Background Art
[0002] A motor is a device that converts electrical energy into mechanical energy. It uses an energized coil (i.e., stator winding) to generate a rotating magnetic field and acts on a rotor (such as a squirrel-cage closed aluminum frame) to form a magneto-electrodynamic rotating torque. The motor is mainly composed of a stator and a rotor. The direction of the force movement of the energized wire in the magnetic field is related to the direction of the current and the magnetic flux lines (magnetic field direction). Depending on the power supply used, motors can be divided into DC motors and AC motors, of which AC motors can be divided into synchronous motors and asynchronous motors.
[0003] A brushless motor is a synchronous motor that uses a DC power supply, also known as an electronically commutated motor or a synchronous DC motor. It integrates the advantages of DC motors and AC motors, and has the advantages of simple structure, no commutation sparks, reliable operation and easy maintenance. Brushless motors usually consist of a motor body and a driver. They use an automatic control mode of operation. They do not add a starting winding to the rotor like a synchronous motor that starts under heavy load under variable frequency speed regulation, nor do they produce oscillations and loss of steps when the load suddenly changes. The development history of brushless motors can be traced back to the birth of motors in the last century, but it was not until recent years that the performance of brushless motors has been significantly improved with the development of power electronics technology, control technology and permanent magnet materials. At present, brushless motors have been widely used in automobiles, home appliances, industrial equipment and other fields.
[0004] The structure of the brushless motor mainly consists of two parts: the motor body and the driver. The motor body consists of a stator and a rotor, where the stator winding adopts a three-phase symmetrical star connection method, and the rotor is attached with magnetized permanent magnets. In order to detect the polarity of the motor rotor, a position sensor is installed in the motor. The driver consists of semiconductor switching devices, and the motor is operated through electronic commutation.
[0005] When the motor is running, the magnetic field acts on the rotor, and the rotor will generate induced current. At the same time, these currents will generate magnetic fields, interacting with the original magnetic field, so that the rotor and stator windings will heat up. In addition, the resistance and current of the stator windings will also generate heat, especially in abnormal conditions such as high load or short circuit, the heating situation is more serious. Existing motors usually have a cooling fan that rotates synchronously with the rotor at one end of the rotor. The cooling fan forces the air inside to flow, but the internal space of the motor is small, and the cooling fan is not efficient whether it is to discharge hot air or to inhale cold air. Utility Model Content
[0006] In order to overcome the deficiencies of the prior art solutions, the utility model provides a high-speed brushless motor, which can effectively solve the technical problem of low heat dissipation efficiency.
[0007] The technical solution adopted by the utility model to solve its technical problems is:
[0008] A high-speed brushless motor comprises a motor housing, a stator and a rotor. The stator is fixedly arranged in the motor housing, and the rotor is rotatably arranged in the stator. The axes of the stator and the rotor coincide. A terminal box is arranged at one end of the motor housing, and the rotor is arranged in the stator through a rotating shaft. Protective covers are arranged at both ends of the motor housing, and an axial hole is arranged in the middle of the protective cover. The two ends of the rotating shaft pass through the two axial holes respectively. A fixed bearing is arranged at one end of the protective cover close to the motor housing, and the fixed bearing is aligned with the axial hole. The two ends of the rotating shaft pass through the two fixed bearings respectively. An air intake fan is arranged at one end of the rotor close to the terminal box, and an exhaust fan is arranged at one end of the rotor away from the terminal box. A heat dissipation duct is arranged between the stator and the motor housing, an air inlet hole is arranged in the middle of the protective cover close to one side of the terminal box, and an exhaust hole is arranged on the side wall of the protective cover away from the terminal box. The terminal box is arranged on the outside of the protective cover close to the air intake fan, and a heat dissipation plate is arranged between the terminal box and the protective cover.
[0009] Furthermore, the inner wall of the motor housing is provided with a raised positioning guide column, which is parallel to the axis of the stator and the rotor, and the side wall of the stator is provided with a slide groove, which is aligned with the positioning guide column, and the stator is inserted into the motor housing along the slide groove and the positioning guide column.
[0010] Furthermore, a limiting pressure plate is arranged between the motor housing and the protective cover, the limiting pressure plate is in close contact with the end faces of the motor housing and the stator, the edge of the protective cover is provided with a surrounding edge, the motor housing is inserted into the surrounding edge and connected to the protective cover.
[0011] Furthermore, the side wall of the surrounding edge is provided with a fixing connection hole, and the two protective covers are connected by bolts, and the bolts pass through the fixing connection holes on the two protective covers.
[0012] Furthermore, the terminal box is mounted on the protective cover via a support frame, a wiring groove is provided on a side wall of the terminal box, an end of the wiring groove away from the terminal box extends to the surface of the motor housing, and a threading hole is provided on the surface of the motor housing.
[0013] Furthermore, a plurality of heat dissipation blocks are arranged on the surface of the heat dissipation plate, and the plurality of heat dissipation blocks are evenly arranged.
[0014] Furthermore, the inner wall of the protective cover is provided with a bearing groove, and the fixed bearing is arranged in the bearing groove.
[0015] Compared with the prior art, the utility model has the following beneficial effects: protective covers are provided at both ends of the motor housing, and an intake fan and an exhaust fan are respectively provided at both ends of the rotor. When the motor starts working, the intake fan and the exhaust fan rotate synchronously with the rotor. When the intake fan rotates, the outside cold air is sucked into the motor housing from the air inlet hole, and the cold air passes through the heat sink before flowing through the air inlet hole. After entering the motor housing, the cold air absorbs the heat generated by the stator and the rotor, and the exhaust fan sends the air that has absorbed the heat out of the motor housing from the exhaust hole, thereby accelerating the air flow in the motor housing and improving the heat dissipation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a structural schematic diagram of a high-speed brushless motor of the utility model;
[0017] Figure 2 This is an exploded diagram of a high-speed brushless motor of the utility model;
[0018] Figure 3 This is a cross-sectional view of a high-speed brushless motor of the utility model;
[0019] Numbers in the figure: 1-motor housing, 2-stator, 3-rotor, 4-positioning guide column, 5-slide groove, 6-terminal box, 7-protective cover, 8-fixed bearing, 9-bearing groove, 10-intake fan, 11-exhaust fan, 12-air inlet hole, 13-exhaust hole, 14-support frame, 15-wiring groove, 16-heat sink, 17-heat sink block, 18-limiting pressure plate, 19-edge, 20-bolt, 21-fixed connection hole, 22-rotating shaft. DETAILED DESCRIPTION
[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0021] Combine the following Figure 1-Figure 3 A high-speed brushless motor of the utility model is described in detail:
[0022] A high-speed brushless motor comprises a motor housing 1, a stator 2 and a rotor 3, wherein the stator 2 is fixedly arranged in the motor housing 1, the inner wall of the motor housing 1 is provided with a raised positioning guide column 4, the positioning guide column 4 is parallel to the axis of the stator 2 and the rotor 3, the side wall of the stator 2 is provided with a slide groove 5, the slide groove 5 is aligned with the positioning guide column 4, the stator 2 is inserted into the motor housing 1 along the slide groove 5 and the positioning guide column 4, so that the installation of the stator 2 is more convenient, the rotor 3 is rotatably arranged in the stator 2, the axis of the stator 2 and the rotor 3 coincide, a terminal box 6 is arranged at one end of the motor housing 1, the rotor 3 is arranged in the stator 2 through a rotating shaft 22, and protective covers 7 are arranged at both ends of the motor housing 1 to prevent the stator 2 from being damaged. An axial hole is provided in the middle of the protective cover 7, and both ends of the rotating shaft 22 pass through the two axial holes respectively. A fixed bearing 8 is provided at the end of the protective cover 7 close to the motor housing 1, and a bearing groove 9 is provided on the inner wall of the protective cover 7. The fixed bearing 8 is provided in the bearing groove 9, and the fixed bearing 8 is aligned with the axial hole. Both ends of the rotating shaft 22 pass through the two fixed bearings 8 respectively. An intake fan 10 is provided at the end of the rotor 3 close to the terminal box 6, and an exhaust fan 11 is provided at the end of the rotor 3 away from the terminal box 6. A heat dissipation air duct is provided between the stator 2 and the motor housing 1, an air inlet hole 12 is provided in the middle of the protective cover 7 close to the terminal box 6, and an exhaust hole 13 is provided on the side wall of the protective cover 7 away from the terminal box 6.
[0023] The terminal box 6 is arranged on the outside of the protective cover 7 near the intake fan 10. The terminal box 6 is installed on the protective cover 7 through a support frame 14. A wiring groove 15 is provided on the side wall of the terminal box 6. The wiring groove 15 extends to the surface of the motor housing 1 at one end away from the terminal box 6. The surface of the motor housing 1 is provided with a threading hole. A heat sink 16 is provided between the terminal box 6 and the protective cover 7. The heat sink 16 can absorb the heat generated when the terminal box 6 is working. A plurality of heat sink blocks 17 are provided on the surface of the heat sink 16. The plurality of heat sink blocks 17 are evenly arranged to increase the contact area between the heat sink 16 and the air and improve the heat exchange efficiency. A limiting pressure plate 18 is arranged between the motor housing 1 and the protective cover 7. After the protective cover 7 is installed, the limiting pressure plate 18 is squeezed so that the limiting pressure plate 18 is tightly attached to the end faces of the motor housing 1 and the stator 2, thereby fixing the position of the stator 2. A surrounding edge 19 is arranged on the edge of the protective cover 7. The motor housing 1 is inserted into the surrounding edge 19 and connected to the protective cover 7. A fixed connection hole 21 is arranged on the side wall of the surrounding edge 19. The two protective covers 7 are connected by bolts 20. The bolts 20 pass through the fixed connection holes 21 on the two protective covers 7. The two protective covers 7 are clamped on the motor housing 1 by the bolts 20, thereby realizing a fixed connection.
[0024] In a high-speed brushless motor of the present embodiment, protective covers 7 are provided at both ends of the motor housing 1, and suction fans 10 and exhaust fans 11 are provided at both ends of the rotor 3. When the motor starts working, the suction fans 10 and the exhaust fans 11 rotate synchronously with the rotor 3. When the suction fan 10 rotates, the external cold air is sucked into the motor housing 1 from the air inlet 12. The cold air passes through the heat sink 16 before flowing through the air inlet 12, thereby improving the heat dissipation efficiency of the terminal box 6. After entering the motor housing 1, the cold air absorbs the heat generated by the stator 2 and the rotor 3. The exhaust fan 11 sends the air after absorbing the heat out of the motor housing 1 from the exhaust holes 13, thereby accelerating the air flow in the motor housing 1 and improving the heat dissipation efficiency.
[0025] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.
Claims
1. A high-speed brushless motor, comprising a motor housing, a stator and a rotor, wherein the stator is fixedly arranged in the motor housing, the rotor is rotatably arranged in the stator, the axes of the stator and the rotor coincide, and a terminal box is arranged at one end of the motor housing, characterized in that: The rotor is arranged in the stator through the rotating shaft, and protective covers are arranged at both ends of the motor housing. An axial hole is arranged in the middle of the protective cover, and the two ends of the rotating shaft pass through the two axial holes respectively. A fixed bearing is arranged at one end of the protective cover close to the motor housing, and the fixed bearing is aligned with the axial hole. The two ends of the rotating shaft pass through the two fixed bearings respectively. An air intake fan is arranged at one end of the rotor close to the terminal box, and an exhaust fan is arranged at one end of the rotor away from the terminal box. A heat dissipation duct is arranged between the stator and the motor housing, an air inlet hole is arranged in the middle of the protective cover close to the terminal box, and an exhaust hole is arranged on the side wall of the protective cover away from the terminal box. The terminal box is arranged on the outside of the protective cover close to the air intake fan, and a heat dissipation plate is arranged between the terminal box and the protective cover.
2. A high-speed brushless motor according to claim 1, characterized in that: The inner wall of the motor housing is provided with a raised positioning guide column, which is parallel to the axis of the stator and the rotor. The side wall of the stator is provided with a slide groove, which is aligned with the positioning guide column, and the stator is inserted into the motor housing along the slide groove and the positioning guide column.
3. A high-speed brushless motor according to claim 1, characterized in that: A limiting pressure plate is arranged between the motor housing and the protective cover, the limiting pressure plate is in close contact with the end faces of the motor housing and the stator, the edge of the protective cover is provided with a surrounding edge, the motor housing is inserted into the surrounding edge and connected to the protective cover.
4. A high-speed brushless motor according to claim 3, characterized in that: The side wall of the surrounding edge is provided with a fixing connection hole, and the two protective covers are connected by bolts, and the bolts pass through the fixing connection holes on the two protective covers.
5. A high-speed brushless motor according to any one of claims 1 to 4, characterized in that: The terminal box is installed on the protective cover through a support frame. The side wall of the terminal box is provided with a wiring groove. The wiring groove extends to the surface of the motor housing away from one end of the terminal box. The surface of the motor housing is provided with a threading hole.
6. A high-speed brushless motor according to any one of claims 1 to 4, characterized in that: A plurality of heat dissipation blocks are arranged on the surface of the heat dissipation plate, and the heat dissipation blocks are evenly arranged.
7. A high-speed brushless motor according to any one of claims 1 to 4, characterized in that: The inner wall of the protective cover is provided with a bearing groove, and the fixed bearing is arranged in the bearing groove.