CN215956182U

CN215956182U - DC brushless external rotor motor with double encoders

Info

Publication number: CN215956182U
Application number: CN202121757075.6U
Authority: CN
Inventors: 盛夕正; 伍云龙; 袁榜; 金万兵
Original assignee: Shanghai Moons Electric Co Ltd
Current assignee: Shanghai Moons Electric Co Ltd
Priority date: 2021-07-30
Filing date: 2021-07-30
Publication date: 2022-03-04
Anticipated expiration: 2031-07-30

Abstract

The utility model relates to a direct-current brushless outer rotor motor with double encoders, which comprises a stator assembly, a rotor assembly and the double encoders, wherein the stator assembly is arranged on the stator assembly; the rotor assembly comprises a machine shell (2) and a front bearing (3), the stator assembly comprises a shaft (12), a rear bearing (13) and an end cover (14), one end of the machine shell (2) is connected with the shaft (12) through the front bearing (3), and the other end of the machine shell (2) is connected with the end cover (14) through the rear bearing (13); the dual encoder comprises a single code wheel (7) assembled on the casing (2) and two encoder chips assembled on the end cover (14). Compared with the prior art, the utility model has the advantages of increasing the structural support rigidity of the motor, ensuring that the motor has small swing in the rotation process of the rotor, high position control precision and the like.

Description

DC brushless external rotor motor with double encoders

Technical Field

The utility model relates to a motor, in particular to a direct-current brushless outer rotor motor with double encoders.

Background

The existing direct current brushless outer rotor motor structure is that one end of an outer rotor shell is fixedly connected with a shaft and synchronously rotates, and the structure has the defect of insufficient support rigidity, so that the rotor is easy to swing greatly, and the motor position control precision is reduced.

Meanwhile, an encoder code wheel of the existing direct-current brushless outer rotor motor is assembled on a rotating shaft at the tail part of the motor, and the structure can increase the axial longer length of the motor. In addition, the existing direct current brushless outer rotor motor generally adopts a single encoder mode, and the control precision of the position or the speed of the motor is not high.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provide a direct-current brushless outer rotor motor with a double encoder.

The purpose of the utility model can be realized by the following technical scheme:

according to one aspect of the utility model, a direct-current brushless outer rotor motor with double encoders is provided, and comprises a stator assembly, a rotor assembly and the double encoders; the rotor assembly comprises a machine shell and a front bearing, the stator assembly comprises a shaft, a rear bearing and an end cover, one end of the machine shell is connected with the front bearing through a shaft, and the other end of the machine shell is connected with the end cover through the rear bearing;

the dual encoder includes a single code wheel mounted to the housing and two encoder chips mounted to the end caps.

As a preferable technical scheme, the stator assembly further comprises a ripple spring and a shaft sleeve or shaft snap spring, the ripple spring is used for locking the relative position after the stator assembly and the rotor assembly are assembled, the upper end face of the ripple spring is in contact with the shaft sleeve or shaft snap spring, and the lower end face of the ripple spring is in contact with the front bearing inner ring.

As a preferred technical scheme, the stator assembly further comprises a screw, a PCB assembly and an insulating gasket, wherein the PCB assembly is fixed with the end cover through the screw, and the insulating gasket is mounted in the middle.

As a preferred technical scheme, the stator assembly further comprises a light shading piece, and the light shading piece is mounted on the PCB assembly and fixed with the end cover through a screw.

As a preferred technical scheme, the stator assembly further comprises a winding stator, the shaft is fixed in a central hole of the end cover, the winding stator is fixed on the shaft, and three phase lines of the winding stator are connected with the PCB assembly through via holes of the end cover; the front bearing and the rear bearing are distributed on two sides of the winding stator.

As the preferred technical scheme, the diameters of two ends of the shell are different, and the diameter of the upper part of the shell is small and the length of the shell is long; the lower part has large diameter and short length.

As a preferable technical scheme, the outer diameters of the front bearing and the rear bearing are the same, and the inner diameters of the front bearing and the rear bearing are different; the inner diameter of the front bearing is small, and the inner diameter of the rear bearing is large.

As a preferred technical scheme, the rotor assembly further comprises a connecting block, a mirror bracket, magnetic steel and a steel sleeve, wherein the mirror bracket is fixed outside the machine shell, the magnetic steel is fixed in the machine shell, the steel sleeve is fixed below the magnetic steel in the machine shell, and the connecting block is fixed above a front bearing in the machine shell; the front bearing and the rear bearing are distributed on two sides of the magnetic steel.

As a preferred technical scheme, the machine shell or the lens frame rotates together with the laser lens or the prism.

Preferably, the shaft of the motor is a fixed part, and the housing is a rotating part.

Compared with the prior art, the utility model has the following advantages:

1. the motor adopts a structure that the rotor component rotates relative to the fixed shaft, and the shell of the rotor component is connected with the shaft and the end cover at two ends through two bearings, so that the structural support rigidity of the motor is increased, the motor has small swing in the rotation process of the rotor, and the position control precision is high.

2. The encoder code disc of the motor is assembled on the shell, the encoder chip is assembled on the motor end cover, the encoder and the motor are well integrated, the structure is compact, and the motor is small in size.

3. The motor adopts a double-encoder mode, mutual compensation is realized, the control precision error caused by the non-concentricity of the code disc and the chip is reduced, and the motor position or speed control precision is high;

4. the motor power and the rotary motion are output to the use end through the machine shell or the mirror bracket, the use structure is compact, and the use space is saved.

Drawings

FIG. 1 is a schematic structural view of the present invention;

wherein, 1 is a connecting block, 2 is a shell, 3 is a front bearing, 4 is a mirror bracket, 5 is magnetic steel, 6 is a steel sleeve, 7 is a coded disc, 8 is a screw, 9 is a shaft sleeve, 10 is a ripple spring, 11 is a winding stator, 12 is a shaft, 13 is a rear bearing, 14 is an end cover, 15 is a shading part, 16 is a PCB assembly, and 17 is an insulating gasket.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.

As shown in fig. 1, a dc brushless external rotor motor with dual encoders includes a stator assembly, a rotor assembly and dual encoders; the rotor assembly comprises a machine shell 2 and a front bearing 3, the stator assembly comprises a shaft 12, a rear bearing 13 and an end cover 14, one end of the machine shell 2 is connected with the shaft 12 through the front bearing 3, and the other end of the machine shell 2 is connected with the end cover 14 through the rear bearing 13; the double-encoder comprises a single code wheel 7 assembled on the shell 2 and two encoder chips assembled on the end cover 14, and the encoder and the motor are well integrated into a whole, so that the structure is compact, and the motor is small in size.

The stator assembly further comprises a shaft sleeve 9 or a shaft snap spring and a corrugated spring 10, the shaft sleeve 9 or the shaft snap spring and the corrugated spring 10 are used for locking the relative positions after the stator assembly and the rotor assembly are assembled, the upper end face of the corrugated spring 10 is in contact with the shaft sleeve 9 or the shaft snap spring, the lower end face of the corrugated spring is in contact with the inner ring of the front bearing 3, the rotor assembly is in a structure of rotating relative to the fixed shaft, and the rotor assembly shell is connected with the shaft and the end cover at two ends through two bearings.

The stator assembly further comprises a screw 8, a PCB assembly 16 and an insulating gasket 17, wherein the PCB assembly 16 is fixed with the end cover 14 through the screw 8, and the insulating gasket 17 is arranged in the middle.

The stator assembly further comprises a winding stator 11, the shaft 12 is fixed in a central hole of the end cover 14, the winding stator 11 is fixed on the shaft 12, and three phase lines of the winding stator 11 are connected with the PCB assembly 16 through via holes of the end cover 14; the front bearing 3 and the rear bearing 13 are distributed on two sides of the wound stator 11. The stator assembly further comprises a light shading part 15, the light shading part 15 is arranged on the PCB assembly 16 and fixed with the end cover 14 through screws, an inner hole of the rear bearing is fixed on the end cover, the shaft is fixed in a central hole in the end cover, the winding stator is fixed on the shaft, and three phase lines of the winding stator are connected with the PCB through the end cover.

The middle of the end cover is provided with a shaft assembling hole, the upper part of the end cover is provided with a bearing assembling surface and a wound stator three-phase line through hole, the bottom surface is a plane with a threaded hole, and the outer edge of the end cover is provided with a motor mounting hole; the diameters of two ends of the shell 2 are different, and the diameter of the upper part of the shell is small and the length of the shell is long; the lower part has large diameter and short length. The front bearing 3 and the rear bearing 13 have the same outer diameter and different inner diameters; the front bearing 3 has a small inner diameter and the rear bearing 13 has a large inner diameter.

The rotor assembly further comprises a connecting block 1, a mirror bracket 4, a magnetic steel 5 and a steel sleeve 6, the mirror bracket 4 is fixed outside the machine shell 2, the magnetic steel 5 is fixed in the machine shell 2, the steel sleeve 6 is fixed below the magnetic steel 5 in the machine shell 2, and the connecting block 1 is fixed above a front bearing 3 in the machine shell; the front bearing 3 and the rear bearing 13 are distributed on two sides of the magnetic steel 5. The machine shell 2 or the lens bracket 4 rotates together with the laser lens or the prism. The shading part is a thin-wall part mechanism and can prevent an external light source from entering the motor through a gap between the rotor component and the stator component to interfere the work of the encoder; the power and the rotary motion of the motor or the mirror bracket are output to a using end through the machine shell; wherein the stator assembly is a stationary component of the electric machine and the rotor assembly is a rotating component of the electric machine.

While the utility model has been described with reference to specific embodiments, the utility model is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the utility model. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A DC brushless outer rotor motor with double encoders is characterized by comprising a stator assembly, a rotor assembly and double encoders; the rotor assembly comprises a machine shell (2) and a front bearing (3), the stator assembly comprises a shaft (12), a rear bearing (13) and an end cover (14), one end of the machine shell (2) is connected with the shaft (12) through the front bearing (3), and the other end of the machine shell (2) is connected with the end cover (14) through the rear bearing (13);

the dual encoder comprises a single code wheel (7) assembled on the casing (2) and two encoder chips assembled on the end cover (14).

2. The brushless dc external rotor motor with dual encoders according to claim 1, wherein the stator assembly further comprises a ripple spring (10) and a shaft sleeve (9) or a shaft snap spring for locking the relative positions after the stator assembly and the rotor assembly are assembled, the upper end surface of the ripple spring (10) is in contact with the shaft sleeve (9) or the shaft snap spring, and the lower end surface is in contact with the inner ring of the front bearing (3).

3. The brushless DC external rotor motor with dual encoders according to claim 1, wherein the stator assembly further comprises screws (8), a PCB assembly (16) and an insulating spacer (17), the PCB assembly (16) is fixed to the end cap (14) by the screws (8), and the insulating spacer (17) is installed in the middle.

4. The brushless DC external rotor motor with dual encoders according to claim 3, wherein the stator assembly further comprises a light shielding member (15), and the light shielding member (15) is mounted on the PCB assembly (16) and fixed to the end cap (14) by screws.

5. The brushless DC external rotor motor with dual encoders according to claim 3, wherein the stator assembly further comprises a wound stator (11), the shaft (12) is fixed in the central hole of the end cap (14), the wound stator (11) is fixed on the shaft (12), and the three phase wires of the wound stator (11) are connected with the PCB assembly (16) through the via hole of the end cap (14); the front bearing (3) and the rear bearing (13) are distributed on two sides of the winding stator (11).

6. The brushless external rotor electric machine of a kind of direct current with one pair of encoders of claim 1, characterized by, the diameter of both ends of the said chassis (2) is different, the upper portion is minor in diameter, long in length; the lower part has large diameter and short length.

7. The DC brushless external rotor motor with double encoders according to claim 1, wherein the front bearing (3) and the rear bearing (13) have the same outer diameter and different inner diameters; the inner diameter of the front bearing (3) is small, and the inner diameter of the rear bearing (13) is large.

8. The brushless external rotor DC motor with dual encoders according to claim 1, wherein the rotor assembly further comprises a connecting block (1), a frame (4), a magnetic steel (5) and a steel sleeve (6), the frame (4) is fixed outside the casing (2), the magnetic steel (5) is fixed in the casing (2), the steel sleeve (6) is fixed below the magnetic steel (5) in the casing (2), and the connecting block (1) is fixed above the front bearing (3) in the casing; the front bearing (3) and the rear bearing (13) are distributed on two sides of the magnetic steel (5).

9. The brushless dc external rotor motor with dual encoders according to claim 8, wherein the housing (2) or the frame (4) rotates together with the laser lens or the prism.

10. The dc brushless external rotor motor with dual encoders as claimed in claim 1, wherein the shaft (12) of the motor is a fixed component and the housing (2) is a rotating component.