Brushless motor for brake cooling

Abstract

The invention relates to the technical field of brushless direct-current motors, in particular to a brushless motor for brake cooling. Comprising a shell, a rotor assembly, a positioning ring and a circuit board assembly, an annular groove is formed in a circuit board, and the circuit board assembly is fixed to the positioning ring on the basis that a slotted pan head screw penetrates through the annular groove to be in threaded connection with a steel wire thread insert; when the slotted pan head screw and the steel wire thread insert are in a non-fastening state, the annular groove supports the circuit board assembly to rotate around the center shaft of the stator assembly. According to the motor, the positioning ring structure capable of being assembled with the stator is arranged, the circuit board assembly is convenient to assemble, the circuit board can be debugged and fixed before the stator is assembled into the shell, the stator assembly is directly assembled into the special-shaped shell after debugging is completed, the requirement for the space in the shell can be effectively lowered, and therefore the motor is light.

Description

Technical Field

[0001] The present invention relates to the technical field of brushless DC motors, and in particular to a brushless motor for brake cooling. Background Art

[0002] Brushless DC motors are used in brake cooling systems. They are drive motors that provide rotational power for the cooling blades of the aircraft brake system. Their working requirements include providing sufficient cooling air volume for the brake system to shorten the secondary flight time. In addition, the motors must be light in weight and easy to assemble, thereby increasing the aircraft's flight distance and being suitable for mass production.

[0003] When assembling the existing brushless DC motor used in the aircraft brake cooling system, an intermediate cover for fixing the circuit board needs to be set inside the shell. However, the intermediate cover occupies the axial space, increases the total weight of the motor, and is very difficult to debug the circuit board due to the limited space inside the shell. Summary of the invention

[0004] In view of this, the present invention provides a brushless motor for brake cooling, which is provided with a positioning ring structure that can be assembled with the stator, so as to facilitate the assembly of the circuit board assembly. The circuit board can be debugged and fixed before the stator is assembled into the housing. After the debugging is completed, the stator assembly is directly assembled into the special-shaped housing, which can effectively reduce the demand for space inside the housing, thereby making the motor lightweight.

[0005] The technical solution of the present invention is:

[0006] A brushless motor for brake cooling, comprising:

[0007] case;

[0008] A stator assembly is mounted and fixed in a designated installation area in the housing;

[0009] A mover assembly rotatably mounted in the stator assembly;

[0010] A positioning ring is coaxially fixedly mounted on the end of the stator assembly away from the rotating shaft outlet and is provided with a wire screw sleeve;

[0011] A circuit board assembly, the main body of which is in the shape of a disk, is coaxially mounted on one end of the positioning ring away from the mover assembly, and includes a circuit board and electronic components mounted on the circuit board;

[0012] Wherein: an annular groove is arranged on the circuit board, and the circuit board assembly is fixed on the positioning ring based on a slotted pan head screw passing through the annular groove and threadedly connected to the wire screw sleeve; when the slotted pan head screw and the wire screw sleeve are not tightened, the annular groove supports the circuit board assembly to rotate around the central axis of the stator assembly.

[0013] Furthermore, the number of the annular grooves is three groups, all of which are semi-annular waist holes, and all of which have a point on the central axis of the stator assembly as the rotation center.

[0014] Furthermore, the angles between the centers of two adjacent semi-circular waist holes and the line connecting the rotation centers are both 60°.

[0015] Furthermore, the main body cross section of the positioning ring is L-shaped, and a boss is provided at one end close to the stator assembly; the positioning ring is inserted into the positioning hole of the stator assembly based on the boss to achieve radial fixation.

[0016] Furthermore, the electronic component is arranged at one end of the circuit board close to the positioning ring; the electronic component is located in a cavity between the positioning ring and the stator assembly.

[0017] Furthermore, a through hole for the stator shaft to pass through is opened at the center of the circuit board.

[0018] Furthermore, before the stator assembly, the positioning ring and the circuit board are installed to the special-shaped housing, the circuit board is debugged based on the matching relationship between the ring groove, the slotted pan head screw and the wire screw sleeve.

[0019] Furthermore, the shell is a special-shaped shell.

[0020] Furthermore, a gasket is provided between the slotted pan head screw and the annular groove.

[0021] Furthermore, the electronic components include Hall elements and capacitors.

[0022] The beneficial effects of the present invention are as follows: the present invention is provided with a positioning ring structure that can be assembled with the stator, which is convenient for assembling the circuit board assembly. The circuit board can be debugged and fixed before the stator is assembled into the shell. After the debugging is completed, the stator assembly is directly assembled into the special-shaped shell, which can effectively reduce the demand for space inside the shell, thereby making the motor lightweight. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 It is a structural schematic diagram of a brushless motor for brake cooling;

[0025] Figure 2 It is a schematic diagram of the structure after the stator assembly, the mover assembly, the positioning ring and the circuit board assembly are assembled;

[0026] Figure 3 It is a structural schematic diagram of the positioning ring;

[0027] Figure 4 is a schematic diagram of the first side of a circuit board assembly;

[0028] Figure 5 is a schematic diagram of the second side of the circuit board assembly;

[0029] Among them: 1. housing; 2. stator assembly; 3. positioning ring; 31. wire screw sleeve; 32. boss; 4. circuit board assembly; 41. slotted pan head screw; 42. gasket; 43. ring groove; 44. Hall element; 45. capacitor. DETAILED DESCRIPTION

[0030] The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0031] The following describes the embodiments of the present disclosure through specific examples, and those skilled in the art can easily understand other advantages and effects of the present disclosure from the contents disclosed in this specification. Obviously, the described embodiments are only a part of the embodiments of the present disclosure, rather than all of the embodiments. The present disclosure can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present disclosure. It should be noted that the following embodiments and features in the embodiments can be combined with each other without conflict. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present disclosure.

[0032] It should be noted that various aspects of the embodiments within the scope of the appended claims are described below. It should be apparent that the aspects described herein can be embodied in a wide variety of forms, and any specific structure and / or function described herein is merely illustrative. Based on the present disclosure, it should be understood by those skilled in the art that an aspect described herein can be implemented independently of any other aspect, and two or more of these aspects can be combined in various ways. For example, any number of aspects described herein can be used to implement the device and / or practice the method. In addition, other structures and / or functionalities other than one or more of the aspects described herein can be used to implement this device and / or practice this method.

[0033] It should also be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present disclosure. The illustrations only show components related to the present disclosure rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0034] Additionally, in the following description, specific details are provided to facilitate a thorough understanding of the examples. However, it will be understood by those skilled in the art that the aspects described may be practiced without these specific details.

[0035] In one embodiment of the present invention, a brushless motor for brake cooling is provided. Figure 1-Figure 5 ,include:

[0036] Shell 1;

[0037] The stator assembly 2 is mounted and fixed in a designated installation area of ​​the housing 1;

[0038] A mover assembly, rotatably mounted in the stator assembly 2;

[0039] A positioning ring 3 is coaxially fixedly mounted on the end of the stator assembly 2 away from the shaft outlet and is provided with a wire screw sleeve 31;

[0040] The circuit board assembly 4 has a disc-shaped main body, is coaxially mounted on one end of the positioning ring 3 away from the mover assembly, and includes a circuit board and electronic components mounted on the circuit board;

[0041] Wherein: an annular groove 43 is provided on the circuit board, and the circuit board assembly 4 is fixed to the positioning ring 3 based on a slotted pan head screw 41 passing through the annular groove 43 and threadedly connected to the wire screw sleeve 31; when the slotted pan head screw 41 and the wire screw sleeve 31 are not tightened, the annular groove 43 supports the circuit board assembly 4 to rotate around the central axis of the stator assembly 2.

[0042] In this embodiment, the number of the annular grooves 43 is three groups, all of which are semi-annular waist holes, and all of which have a point on the central axis of the stator assembly 2 as the rotation center;

[0043] In this embodiment, the angles between the centers of two adjacent semi-circular waist holes and the line connecting the rotation centers are both 60°.

[0044] In this embodiment, the main cross-section of the positioning ring 3 is L-shaped, and a boss 32 is provided at one end close to the stator assembly 2; the positioning ring 3 is inserted into the positioning hole of the stator assembly 2 based on the boss 32 to achieve radial fixation.

[0045] In this embodiment, the electronic component is arranged at one end of the circuit board close to the positioning ring 3 ; the electronic component is located in the cavity between the positioning ring 3 and the stator assembly 2 .

[0046] In this embodiment, a through hole for the stator shaft to pass through is opened at the center of the circuit board.

[0047] In this embodiment, before the stator assembly 2 , the positioning ring 3 and the circuit board are installed to the special-shaped housing 1 , the circuit board is debugged based on the matching relationship between the annular groove 43 , the slotted pan head screw 41 and the wire screw sleeve 31 .

[0048] In this embodiment, the housing 1 is a special-shaped housing 1 .

[0049] In this embodiment, a gasket 42 is provided between the slotted pan head screw 41 and the annular groove 43 .

[0050] In this embodiment, the electronic components include a Hall element 44 and a capacitor 45 .

[0051] In this embodiment, the brushless motor for brake cooling is mainly composed of a bearing gasket 42, a housing 1, a stator assembly 2, a rotor assembly, a stator key, a bearing, a disc spring, an O-ring, a motor rear end cover, a cylindrical head screw with a fuse hole, etc.

[0052] The stator key of this embodiment is fixed in the keyway inside the housing 1 by laser welding. Then the stator assembly 2 is assembled into the housing 1 by hot pressing. Then the rotor assembly and the bearing are assembled into the housing 1, and the axial preload force is applied by the disc spring and the bearing gasket 42, so as to ensure that the upper retainer of the bearing is in close contact with the housing 1 under the action of the axial preload force, and the lower retainer is in close contact with the rotor assembly, thereby reducing the vibration caused by the gap when the motor is running and improving the reliability of the motor operation.

[0053] The rear end cover of the motor in this embodiment is fixed to the end of the housing 1 by a cylindrical head screw with a fuse hole, and a ring groove 43 is set at the stop of the rear end cover of the motor for placing an O-ring. The O-ring is made of HSG-6151 high-temperature silicone rubber, and the stop diameter of the housing 1 is slightly smaller than the outer diameter of the O-ring, so that the O-ring will be squeezed and deformed during the assembly process of the rear end cover of the motor, filling the entire ring groove 43, thereby ensuring that the housing 1 is tightly connected to the rear end cover of the motor, achieving the purpose of waterproofing. During the assembly process, the cylindrical head screw with a fuse hole is coated with thread locking glue on the thread, and a stainless steel fuse is used to ensure that the rear end cover of the motor is fixed and tightened.

[0054] The stator assembly 2 of this embodiment is composed of a circuit board assembly 4, a positioning ring 3, a wire screw sleeve 31, a stator, a gasket 42, and a slotted pan head screw 41. Three bosses 32 are provided at the bottom of the positioning ring 3 for fixing and positioning with the stator. During assembly, the bottom of the positioning ring 3 is coated with epoxy glue J206 to ensure firm bonding and high temperature resistance. Four bottom holes of the wire screw sleeve 31 are provided at the upper end of the positioning ring 3 for placing the wire screw sleeve 31. The wire screw sleeve 31 is made of stainless steel, which can ensure that the screws can be assembled multiple times without causing wear of the threaded hole. The circuit board assembly 4 is fixed to the positioning ring 3 through the gasket 42 on the circuit board and the slotted pan head screw 41.

[0055] The circuit board assembly 4 of this embodiment is composed of a circuit board, a Hall sensor, and a capacitor 45. The circuit board is provided with an annular groove 43, which can be used to rotate the circuit board assembly 4 along the circumference to adjust the relative position with the positioning ring 3, so as to realize the correct position fixation of the Hall sensor and the stator.

[0056] The stator of this embodiment is composed of a stator core, slot wedges, and stator windings. The stator core is composed of stator punchings and stator end pieces. The stator end pieces are provided with three positioning grooves for fixing the positioning ring 3 when it is assembled. The boss 32 of the positioning ring 3 is closely matched with the positioning groove to increase the stability of the structure, thereby ensuring that the circuit board assembly 4 in the stator assembly 2 and the stator position remain consistent under vibration and impact environments.

[0057] The rotor assembly of this embodiment is composed of a rear dynamic balance ring, a rotor sleeve, a shaft assembly, and a front dynamic balance ring. In order to ensure the strength of the rotor structure and prevent the dynamic balance ring and the magnetic steel from falling off under vibration and impact, laser welding is performed at the junction of the dynamic balance ring and the shaft, and the rotor sleeve is press-fitted on the outside of the magnetic steel to improve the reliability of the motor. The rear dynamic balance ring boss 32 is reserved with a certain machining size. After the rear dynamic balance ring is assembled, the rear dynamic balance ring boss 32 is machined according to the assembly distance between the two bearings, thereby ensuring the consistency of the motor assembly size and improving the reliability of the motor.

[0058] The rear dynamic balance ring of this embodiment is provided with a bearing docking boss 32 to ensure the precise assembly of the rear dynamic balance ring and the lower bearing cage. At the same time, four welding reserved grooves are provided at the boss 32 to avoid the change of the matching size between the rear dynamic balance ring and the bearing due to the deformation of the weld bead, thereby improving the reliability of the motor.

[0059] The shaft assembly of this embodiment is composed of a rotor core, a rotor key, a gear shaft, a magnetic steel, and a magnetic steel. The magnetic steel is coated with structural glue before being placed in the rotor core groove, and epoxy glue is poured into the gaps of the two-pole magnetic steel after the magnetic steel is assembled. The combination of structural glue, epoxy glue and the attraction between the magnetic steel and the rotor core ensures that the magnetic steel is firmly assembled.

[0060] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present disclosure should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A brushless motor for brake cooling, characterized in that: include: case; A stator assembly is mounted and fixed in a designated installation area in the housing; A mover assembly rotatably mounted in the stator assembly; A positioning ring is coaxially fixedly mounted on the end of the stator assembly away from the rotating shaft outlet and is provided with a wire screw sleeve; A circuit board assembly, the main body of which is in the shape of a disk, is coaxially mounted on one end of the positioning ring away from the mover assembly, and includes a circuit board and electronic components mounted on the circuit board; Wherein: an annular groove is arranged on the circuit board, and the circuit board assembly is fixed on the positioning ring based on a slotted pan head screw passing through the annular groove and threadedly connected to the wire screw sleeve; when the slotted pan head screw and the wire screw sleeve are not tightened, the annular groove supports the circuit board assembly to rotate around the central axis of the stator assembly.

2. The brushless motor for brake cooling according to claim 1, characterized in that: There are three groups of annular grooves, all of which are semi-annular waist holes, and all of which have a point on the central axis of the stator assembly as the rotation center.

3. The brushless motor for brake cooling according to claim 2, characterized in that: The angles between the centers of two adjacent semi-circular waist holes and the line connecting the rotation centers are both 60°.

4. The brushless motor for brake cooling according to claim 3, characterized in that: The main body cross section of the positioning ring is L-shaped, and a boss is arranged at one end close to the stator assembly; the positioning ring is inserted into the positioning hole of the stator assembly based on the boss to achieve radial fixation.

5. The brushless motor for brake cooling according to claim 4, characterized in that: The electronic component is arranged at one end of the circuit board close to the positioning ring; the electronic component is located in a cavity between the positioning ring and the stator assembly.

6. The brushless motor for brake cooling according to claim 5, characterized in that: A through hole for the stator shaft to pass through is opened at the center of the circuit board.

7. The brushless motor for brake cooling according to claim 6, characterized in that: Before the stator assembly, the positioning ring and the circuit board are installed to the housing, the circuit board is debugged based on the matching relationship between the ring groove, the slotted pan head screw and the wire screw sleeve.

8. The brushless motor for brake cooling according to claim 7, characterized in that: The shell is a special-shaped shell.

9. The brushless motor for brake cooling according to claim 8, characterized in that: A gasket is arranged between the slotted pan head screw and the annular groove.

10. The brushless motor for brake cooling according to claim 9, characterized in that: The electronic components include a Hall element and a capacitor.

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