A brushless DC motor

Abstract

The utility model discloses a brushless DC motor in the field of DC motor technology, aiming to solve the problem that the air gap between the rotor and the stator of the brushless DC motor in the prior art is usually fixed, and cannot be adjusted, making it difficult to ensure the reliability of the motor during operation. It includes a housing, a stator is detachably connected to the inner side of the housing, a controller is provided inside the housing on one side of the stator, the controller is electrically connected to the stator, and the inner wall of the housing is located inside the stator and is rotatably connected to the rotor; an air gap is left between the rotor and the stator, and a magnetic protection ring is detachably connected to the outer wall of the rotor inside the air gap; the utility model fixes the magnetic protection ring to the outer side of the rotor, thereby adjusting the size of the air gap between the stator and the rotor, ensuring the mechanical strength of the motor while making the motor have a smaller moment of inertia ratio, while ensuring the performance of the motor, avoiding the collision between the rotor and the stator during operation, ensuring the reliability of the motor operation, and ensuring the working effect of the device.

Description

Technical Field

[0001] The utility model relates to a brushless DC motor, belonging to the technical field of DC motors. Background Art

[0002] There are various types of motors, and the brushless DC motor is the most ideal speed-regulating motor today. It combines the advantages of DC motors and AC motors, with the advantages of DC motors’ good adjustment performance and AC motors’ simple structure, no commutation sparks, reliable operation, and easy maintenance. Therefore, it is very popular in the market and widely used in automobiles, home appliances, industrial equipment and other fields.

[0003] In motor design, the size of the air gap has a great influence on the performance and operating reliability of asynchronous motors. If the air gap is too large, the magnetic resistance will increase greatly, thereby increasing the excitation loss, the excitation current will also increase, the power factor of the motor will also decrease, and the performance of the motor will deteriorate; in order to reduce the excitation current and improve the power factor, the air gap should be minimized; but if the air gap is too small, the air gap harmonic magnetic field will increase, the stray loss and noise of the motor will increase, and the maximum torque and starting torque will be reduced. At the same time, if the air gap is too small, it is easy for the running rotor to rub against the stator, resulting in a sweeping phenomenon, which will make it difficult to start, thereby reducing the reliability of operation and making it difficult to assemble.

[0004] The air gap between the rotor and the stator of the existing brushless DC motor is usually fixed and cannot be adjusted, which makes it difficult to ensure the reliability of the motor during operation and affects the working effect of the device. Utility Model Content

[0005] The utility model aims to overcome the deficiencies in the prior art and provide a brushless DC motor to solve the problem that the air gap between the rotor and the stator of the existing brushless DC motor is usually fixed and cannot be adjusted, making it difficult to ensure the reliability of the motor during operation.

[0006] In order to solve the above technical problems, the utility model is implemented by adopting the following technical solutions:

[0007] The utility model provides a brushless DC motor, comprising a housing, a stator is detachably connected to the inner side of the housing, a controller is arranged inside the housing on one side of the stator, the controller is electrically connected to the stator, and a rotor is rotatably connected to the inner wall of the housing located inside the stator;

[0008] An air gap is reserved between the rotor and the stator, and a magnetic protection ring is detachably connected to the outer wall of the rotor inside the air gap.

[0009] Furthermore, the rotor includes a rotating shaft and an electromagnet sleeved on an outer wall of the rotating shaft, and the stator includes an armature core, a coil is wound around the armature core, and the coil is located on one side of the electromagnet.

[0010] Furthermore, a protective sleeve is provided on the outer wall of the rotating shaft, and the protective sleeve is located on one side of the electromagnet.

[0011] Furthermore, the housing includes a first shell and a second shell, and two sides of the outer wall of the stator are detachably connected to the first shell and the second shell respectively.

[0012] Furthermore, the second shell is rotatably connected to the rotor via a bearing.

[0013] Furthermore, a cavity is opened inside the second shell on one side of the stator, and the controller is arranged inside the cavity. The controller includes a PCB board and a conductive column, and the conductive column is used to supply power to the PCB board.

[0014] Furthermore, a clamping terminal is sleeved on the outer wall of the rotating shaft, and the clamping terminal is located on one side of the electromagnet.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The brushless DC motor can fix the magnetic ring on the outside of the rotor by cooperating with the magnetic ring and the rotor, so as to adjust the size of the air gap between the stator and the rotor, thereby ensuring the mechanical strength of the motor and making the motor have a smaller rotational inertia ratio; while ensuring the performance of the motor, it avoids the rotor and the stator from rubbing against each other during operation, thereby avoiding the phenomenon of chamber sweeping, ensuring the reliability of the motor operation, and ensuring the working effect of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front cross-sectional schematic diagram of a brushless DC motor provided according to an embodiment of the utility model;

[0018] Figure 2 It is a schematic front cross-sectional view of a rotor provided according to an embodiment of the utility model.

[0019] In the figure: 1. shell; 11. first shell; 12. second shell; 13. bearing; 14. cavity; 2. stator; 3. rotor; 31. shaft; 32. electromagnet; 33. protective cover; 34. clamping terminal; 4. magnetic protection ring; 5. controller; 51. PCB board; 52. conductive column; 6. air gap. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0021] In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0023] like Figure 1-2 As shown, the utility model provides a brushless DC motor, including a shell 1, a stator 2 is detachably connected to the inner side of the shell 1, a controller 5 is provided inside the shell 1 on one side of the stator 2, the controller 5 is electrically connected to the stator 2, and the inner wall of the shell 1 is located inside the stator 2 and is rotatably connected to a rotor 3; an air gap 6 is left between the rotor 3 and the stator 2, and a magnetic protection ring 4 is detachably connected to the outer wall of the rotor 3 inside the air gap 6.

[0024] Specifically, the controller 5 is used to control the on and off of the power supply of the stator 2 and the rotor 3, and to control the rotation of the motor; when installing the motor, according to actual work needs, the magnetic ring 4 can be sleeved on the outside of the rotor 3, and the relative positions of the two can be fixed, so that the magnetic ring 4 is located on the inside of the air gap 6, so that the size of the air gap 6 between the stator 2 and the rotor 3 can be adjusted by the magnetic ring 4. According to different work needs, the magnetic ring 4 of different thicknesses can be replaced, so as to flexibly adjust the size of the air gap 6 between the stator 2 and the rotor 3, thereby improving the motor. Power factor; the magnetic ring 4 can support the structure of the rotor 3, so that the motor has greater mechanical strength and ensures the safety of the device. At the same time, the magnetic ring 4 adjusts the size of the air gap 6 between the stator 2 and the rotor 3, and while ensuring the performance of the motor, avoids the running rotor 3 and the stator 2 from rubbing, thereby avoiding the occurrence of the bore sweeping phenomenon, ensuring the reliability of the motor operation, and ensuring the working effect of the device; Optionally, the magnetic ring 4 is an alloy or composite material, and adding a layer of magnetic ring 4 on the rotor 3 can prevent magnetic leakage and ensure the stability of the device during operation.

[0025] The utility model can fix the magnetic protection ring 4 to the outside of the rotor 3 by cooperating with the rotor 3 through the magnetic protection ring 4, so as to adjust the size of the air gap 6 between the stator 2 and the rotor 3, thereby ensuring the mechanical strength of the motor and making the motor have a smaller moment of inertia ratio; while ensuring the performance of the motor, it avoids the rotor 3 and the stator 2 from rubbing during operation, thereby avoiding the occurrence of the bore sweeping phenomenon, ensuring the reliability of the motor operation, and ensuring the working effect of the device.

[0026] like Figure 2 As shown, in one embodiment, the rotor 3 includes a rotating shaft 31 and an electromagnet 32 ​​sleeved on the outer wall of the rotating shaft 31, and the stator 2 includes an armature core, a coil is wound around the armature core, and the coil is located on one side of the electromagnet 32; the electromagnet 32 ​​is arranged corresponding to the coil, and the controller 5 connects the coil and the electromagnet 32 ​​to control the on and off of the current to realize the rotation of the motor.

[0027] In one embodiment, a protective sleeve 33 is provided on the outer wall of the rotating shaft 31 , and the protective sleeve 33 is located on one side of the electromagnet 32 ​​. The protective sleeve 33 not only protects the electromagnet 32 ​​, but also plays a certain positioning role for the electromagnet 32 ​​.

[0028] In one embodiment, the housing 1 includes a first shell 11 and a second shell 12, and both sides of the outer wall of the stator 2 are detachably connected to the first shell 11 and the second shell 12 respectively, and the outer wall of the stator 2 and the outer walls of the first shell 11 and the second shell 12 are all on the same plane.

[0029] In one embodiment, the second shell 12 is rotatably connected to the rotor 3 via a bearing 13. Optionally, a lubricating coating is provided at the bearing 13 to reduce the friction resistance of the rotor 3 during rotation, making the rotation smoother and ensuring the practicability of the device.

[0030] like Figure 1 As shown, in one embodiment, a cavity 14 is opened inside the second shell 12 on one side of the stator 2, and the controller 5 is arranged inside the cavity 14. The controller 5 includes a PCB board 51 and a conductive column 52. The conductive column 52 is used to power the PCB board 51. According to actual work needs, when assembling the motor, the PCB board 51 can be directly replaced to replace the 12V voltage regulator tube with a 0Ω resistor, thereby changing the working voltage by changing one component, eliminating the time and volume change caused by replacing the design circuit and using a transformer, and there is no need to use different circuit boards, thereby reducing design time.

[0031] like Figure 2 As shown, in one embodiment, a clamping terminal 34 is sleeved on the outer wall of the rotating shaft 31, and the clamping terminal 34 is located on one side of the electromagnet 32; the clamping terminal 34 can further limit and protect the electromagnet 32, thereby ensuring the structural stability of the device.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A brushless DC motor, characterized in that: The invention comprises a shell (1), a stator (2) being detachably connected to the inner side of the shell (1), a controller (5) being provided inside the shell (1) on one side of the stator (2), the controller (5) being electrically connected to the stator (2), and a rotor (3) being rotatably connected to the inner wall of the shell (1) located inside the stator (2); An air gap (6) is left between the rotor (3) and the stator (2), and a magnetic protection ring (4) is detachably connected to the outer wall of the rotor (3) inside the air gap (6).

2. A brushless DC motor according to claim 1, characterized in that: The rotor (3) comprises a rotating shaft (31) and an electromagnet (32) sleeved on the outer wall of the rotating shaft (31); the stator (2) comprises an armature core, a coil is wound around the armature core, and the coil is located on one side of the electromagnet (32).

3. A brushless DC motor according to claim 2, characterized in that: The outer wall of the rotating shaft (31) is provided with a protective sleeve (33), and the protective sleeve (33) is located on one side of the electromagnet (32).

4. A brushless DC motor according to claim 1, characterized in that: The housing (1) comprises a first shell (11) and a second shell (12), and two sides of an outer wall of the stator (2) are detachably connected to the first shell (11) and the second shell (12) respectively.

5. A brushless DC motor according to claim 4, characterized in that: The second shell (12) is rotatably connected to the rotor (3) via a bearing (13).

6. A brushless DC motor according to claim 4, characterized in that: A cavity (14) is provided inside the second shell (12) on one side of the stator (2); the controller (5) is arranged inside the cavity (14); the controller (5) comprises a PCB board (51) and a conductive column (52); the conductive column (52) is used to supply power to the PCB board (51).

7. A brushless DC motor according to claim 2, characterized in that: The outer wall of the rotating shaft (31) is sleeved with a clamping terminal (34), and the clamping terminal (34) is located on one side of the electromagnet (32).

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