Anti-impact coreless brushless motor

Abstract

The utility model discloses an anti-impact coreless brushless motor, which comprises a casing, a stator assembly and a rotor assembly arranged in a cavity of the casing, a front cover arranged at the front end of the casing, a rear cover arranged at the rear end of the casing, a through hole arranged in the middle of the front cover, a threaded connection groove arranged at the front end of the through hole, a first bearing arranged in the through hole, and a threaded bushing arranged in the threaded connection groove. The first bearing abuts against the rotor assembly, and the threaded bushing can adjust the gap between the rotor assembly and the rear cover. According to the utility model, the gap between the shaft and the rear cover is adjusted by adopting the threaded bushing, so that the rear cover is stressed when the motor is impacted, the bearing is prevented from being stressed, and the motor can normally operate after being axially impacted.

Description

Technical Field

[0001] The utility model relates to a coreless brushless motor, in particular to an impact-proof coreless brushless motor. Background Art

[0002] Coreless brushless motors are DC permanent magnet servo micro motors. The main difference from ordinary brushless DC motors is that there is no tooth slot on the armature core, and the motor winding is made into a cup-shaped motor according to a special winding process. Compared with traditional slot motors, it has the following advantages: 1. High efficiency: The efficiency of coreless motors is mostly above 70%, and some products are even close to 90%, while the efficiency of traditional slot motors is below 70% under the same volume and weight; 2. Small size, light weight, high power and torque density: Due to the improved work efficiency and reduced loss, the power density of coreless motors has been greatly improved. Compared with traditional slot motors, the volume and weight can be reduced by about 30%; 3. Good control performance: There is no torque fluctuation caused by the slot effect, and the motor runs smoothly; the electromechanical time constant is low, the dynamic response is good, the inductance of the motor is very low, the conventional electrical time constant is within 0.1ms, and the electromechanical time constant is about 2ms. The motor responds quickly and the control is precise. It is suitable for application in high-precision drive systems, such as communications, robots, security, aerospace, rudder control systems and other fields.

[0003] At present, the existing hollow cup brushless motor generally includes a rotor assembly, a stator assembly, a front cover and a rear cover. The rotor shaft is passed through the bearings of the front cover and the rear cover. The movement of the rotor assembly is limited by the front cover and the rear cover. When the motor vibrates due to external impact, the front cover and the rear cover are prone to looseness to varying degrees, resulting in instability of the rotor assembly. The rotor works in an unstable state, which easily reduces the life of the motor. Summary of the invention

[0004] In order to overcome the shortcomings and deficiencies in the prior art, the utility model aims to provide an impact-proof hollow cup brushless motor.

[0005] The purpose of the utility model is achieved through the following technical solutions: an impact-proof hollow cup brushless motor, including a housing, a stator assembly and a rotor assembly are arranged in the cavity of the housing, a front cover is arranged at the front end of the housing, and a rear cover is arranged at the rear end, a through hole is arranged in the middle of the front cover, a threaded connection groove is arranged at the front end of the through hole, a first bearing is arranged in the through hole, a threaded bushing is arranged in the threaded connection groove, the first bearing abuts against the rotor assembly, and the threaded bushing can adjust the gap between the rotor assembly and the rear cover. The rotor assembly can adjust the distance from the rear cover through the threaded bushing during assembly, and can adjust the appropriate stringing amount to improve the stability of the rotor assembly during rotation.

[0006] As an improvement of the impact-proof hollow cup brushless motor of the utility model, the rotor assembly includes a rotating shaft and a bushing, one end of the rotating shaft passes through the bushing, one side of the bushing is provided with a spring installation groove, a spring is provided in the spring installation groove, when the threaded bushing rotates clockwise, it can push the rotor assembly to move and compress the spring, and the other end of the rotating shaft passes through the middle of the threaded bushing. The spring has the function of buffering impact force and reducing the vibration of the rotor assembly.

[0007] As an improvement of the impact-proof coreless brushless motor of the utility model, the inner side surface of the rear cover is provided with a bearing installation groove, the bottom of the bearing installation groove is provided with an arc groove, a second bearing is provided in the bearing installation groove, one end of the rotating shaft passes through the second bearing and abuts in the arc groove, the rotating shaft abuts against the arc groove and has an arc surface at one end, and one end of the spring abuts against the second bearing. The rear cover is designed with an arc groove corresponding to the arc surface of the rotating shaft to avoid single-point force damage to the rear cover.

[0008] As an improvement of the impact-proof coreless brushless motor of the utility model, the side of the rear cover is provided with a plurality of first pin holes at intervals, and the housing is provided with a pin hole at a position corresponding to each of the first pin holes, and the rear cover is fixed by a plurality of pins when inserted into the housing. The rear cover is reinforced with 7 pins and is not easy to fall off under stress.

[0009] As an improvement of the impact-proof hollow cup brushless motor of the utility model, a plurality of second pin holes are provided at intervals on the side of the front cover, and a pin hole is provided in the casing corresponding to the position of each second pin hole, one end of the front cover is provided with an external thread, and the end of the casing connected to the front cover is provided with an internal thread, and the front cover is screwed to the casing through the external thread and fixed with a plurality of pins.

[0010] As an improvement of the impact-proof hollow cup brushless motor of the utility model, the rotor assembly also includes a cylindrical sleeve and a T-shaped sleeve, the rotating shaft is passed through the cylindrical sleeve and the T-shaped sleeve, and the first bearing abuts against the T-shaped sleeve.

[0011] As an improvement of the impact-proof hollow cup brushless motor of the utility model, the rotor assembly also includes a magnetic steel and a magnetic steel sleeve, the magnetic steel sleeve is arranged on the cylindrical sleeve and the T-shaped sleeve, the magnetic steel sleeve is sleeved on the magnetic steel, and one end of the magnetic steel abuts against the edge step of the T-shaped sleeve. The T-shaped sleeve is designed as a stepped square sleeve, and the front end step fixes the magnetic steel axially and limits the magnetic steel leakage, so as to avoid the front end shaft being affected by the magnetic force of the magnetic steel and causing jamming.

[0012] As an improvement of the impact-proof hollow cup brushless motor of the utility model, the stator assembly includes a winding cup and a punching sheet, the winding cup is inserted into the punching sheet, and the rotor assembly is inserted into the winding cup.

[0013] As an improvement of the impact-proof hollow cup brushless motor of the utility model, it also includes a bracket and a PCB board, the PCB board is fixed on the bracket, and the bracket is installed in the casing.

[0014] The beneficial effect of the utility model is that the utility model adopts the threaded bushing to adjust the gap between the shaft and the rear cover, so as to ensure that the rear cover is subjected to force when the motor is impacted, and avoid the bearing from being subjected to force, and can ensure that the motor can operate normally after being subjected to axial impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the utility model;

[0016] The accompanying drawings are marked as follows: 1, casing, 2, stator assembly, 3, rotor assembly, 4, front cover, 5, rear cover, 6, threaded connection groove, 7, first bearing, 8, threaded bushing, 9, bearing mounting groove, 10, arc groove, 11, second bearing, 12, pin, 13, bracket, 14, PCB board, 21, winding cup, 22, punching sheet, 31, rotating shaft, 32, bushing, 33, spring mounting groove, 34, spring, 35, cylindrical sleeve, 36, T-shaped sleeve, 37, magnet, 38, magnetic sleeve. DETAILED DESCRIPTION

[0017] 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 of 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.

[0018] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the components under a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0019] In addition, the descriptions of "first", "second", etc. in the present utility model are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present utility model.

[0020] like Figure 1 As shown, an impact-proof hollow cup brushless motor includes a housing 1, a stator assembly 2 and a rotor assembly 3 are arranged in the cavity of the housing 1, a front cover 4 is arranged at the front end of the housing 1, and a rear cover 5 is arranged at the rear end. A through hole is arranged in the middle of the front cover 4, a threaded connection groove 6 is arranged at the front end of the through hole, a first bearing 7 is arranged in the through hole, a threaded bushing 8 is arranged in the threaded connection groove 6, the first bearing 7 abuts against the rotor assembly 3, and the threaded bushing 8 can adjust the gap between the rotor assembly 3 and the rear cover 5. The rotor assembly 3 can adjust the distance with the rear cover through the threaded bushing 8 during assembly, and can adjust the appropriate stringing amount to improve the stability of the rotor assembly during rotation.

[0021] Preferably, the rotor assembly 3 includes a rotating shaft 31 and a bushing 32, one end of the rotating shaft 31 passes through the bushing 32, one side of the bushing 32 is provided with a spring installation groove 33, a spring 34 is provided in the spring installation groove 33, when the threaded bushing 8 rotates clockwise, it can push the rotor assembly 3 to move and compress the spring 34, and the other end of the rotating shaft 31 passes through the middle of the threaded bushing 8. The spring 34 has the function of buffering impact force and reducing the vibration of the rotor assembly.

[0022] Preferably, the inner side of the rear cover 5 is provided with a bearing installation groove 9, the bottom of the bearing installation groove 9 is provided with an arc groove 10, a second bearing 11 is provided in the bearing installation groove 9, one end of the rotating shaft 31 passes through the second bearing 11 and abuts in the arc groove 10, one end of the rotating shaft 31 abutting against the arc groove 10 is provided with an arc surface, and one end of the spring 34 abuts against the second bearing 11. The rear cover 5 is designed with an arc groove corresponding to the arc surface of the rotating shaft to avoid single-point force damage to the rear cover.

[0023] Preferably, the side of the back cover 5 is provided with a plurality of first pin holes at intervals, and the housing 1 is provided with a pin hole at a position corresponding to each first pin hole, and when the back cover 5 is inserted into the housing 1, it is fixed by a plurality of pins 12. After being reinforced with 7 pins, the back cover 5 is not easy to fall off under stress.

[0024] Preferably, a plurality of second pin holes are provided at intervals on the side of the front cover 4, a pin hole is provided at the position of each second pin hole in the casing 1, an external thread is provided at one end of the front cover, an internal thread is provided at the end where the casing 1 is connected to the front cover 4, the front cover 4 is screwed to the casing 1 via the external thread and fixed with a plurality of pins 12.

[0025] Preferably, the rotor assembly 3 further includes a cylindrical sleeve 35 and a T-shaped sleeve 36 , the rotating shaft 31 is passed through the cylindrical sleeve 35 and the T-shaped sleeve 36 , and the first bearing 7 abuts against the T-shaped sleeve 36 .

[0026] Preferably, the rotor assembly 3 further comprises a magnetic steel 37 and a magnetic steel sleeve 38, wherein the magnetic steel sleeve 38 is arranged on the cylindrical sleeve 35 and the T-shaped sleeve 36, and the magnetic steel sleeve 38 is sleeved on the magnetic steel 37, and one end of the magnetic steel 37 abuts against the edge step of the T-shaped sleeve 36. The T-shaped sleeve 36 is designed as a stepped square sleeve, and the front end step fixes the magnetic steel axially and limits the magnetic steel leakage, so as to prevent the front end shaft from being affected by the magnetic force of the magnetic steel and causing jamming.

[0027] Preferably, the stator assembly 2 includes a winding cup 21 and a punching sheet 22 , the winding cup 21 is inserted into the punching sheet 22 , and the rotor assembly 3 is inserted into the winding cup 21 .

[0028] Preferably, it further comprises a bracket 13 and a PCB board 14 , wherein the PCB board 14 is fixed on the bracket 13 , and the bracket 13 is installed in the housing 1 .

[0029] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and structures of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An impact-proof coreless brushless motor, comprising a housing, wherein a stator assembly and a rotor assembly are arranged in a cavity of the housing, characterized in that: The front end of the casing is provided with a front cover, and the rear end is provided with a rear cover. A through hole is provided in the middle of the front cover, a threaded connection groove is provided at the front end of the through hole, a first bearing is provided in the through hole, a threaded bushing is provided in the threaded connection groove, the first bearing is pressed against the rotor assembly, and the threaded bushing can adjust the gap between the rotor assembly and the rear cover.

2. The impact-proof coreless brushless motor according to claim 1, characterized in that: The rotor assembly includes a rotating shaft and a bushing, one end of the rotating shaft passes through the bushing, a spring mounting groove is provided on one side of the bushing, a spring is provided in the spring mounting groove, when the threaded bushing rotates clockwise, it can push the rotor assembly to move and compress the spring, and the other end of the rotating shaft passes through the middle of the threaded bushing.

3. The impact-proof coreless brushless motor according to claim 2, characterized in that: A bearing mounting groove is provided on the inner side surface of the rear cover, an arc groove is provided at the bottom of the bearing mounting groove, a second bearing is provided in the bearing mounting groove, one end of the rotating shaft passes through the second bearing and abuts against the arc groove, an arc surface is provided at one end of the rotating shaft abutting against the arc groove, and one end of the spring abuts against the second bearing.

4. The impact-proof coreless brushless motor according to claim 1, characterized in that: The side of the rear cover is provided with a plurality of first pin holes at intervals, and the housing is provided with a pin hole at a position corresponding to each of the first pin holes. When the rear cover is inserted into the housing, it is fixed by a plurality of pins.

5. The impact-proof coreless brushless motor according to claim 1, characterized in that: The side of the front cover is provided with a plurality of second pin holes at intervals, the casing is provided with a pin hole at a position corresponding to each of the second pin holes, one end of the front cover is provided with an external thread, the end of the casing connected to the front cover is provided with an internal thread, the front cover is screwed to the casing via the external thread and fixed with a plurality of pins.

6. The impact-proof coreless brushless motor according to claim 2, characterized in that: The rotor assembly further comprises a cylindrical sleeve and a T-shaped sleeve, the rotating shaft is passed through the cylindrical sleeve and the T-shaped sleeve, and the first bearing abuts against the T-shaped sleeve.

7. The impact-proof coreless brushless motor according to claim 6, characterized in that: The rotor assembly also includes a magnetic steel and a magnetic steel sleeve. The magnetic steel sleeve is arranged on the cylindrical shaft sleeve and the T-shaped shaft sleeve. The magnetic steel sleeve is sleeved on the magnetic steel. One end of the magnetic steel abuts against the edge step of the T-shaped shaft sleeve.

8. The impact-proof coreless brushless motor according to claim 1, characterized in that: The stator assembly comprises a winding cup and a punching sheet, the winding cup is inserted into the punching sheet, and the rotor assembly is inserted into the winding cup.

9. The impact-proof coreless brushless motor according to claim 1, characterized in that: It also includes a bracket and a PCB board, wherein the PCB board is fixed on the bracket, and the bracket is installed in the casing.

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