A motor structure with an optical encoder

Abstract

The application relates to a motor structure with an optical encoder, which comprises a motor body, a shaft sleeve, a code disc, a sleeve assembly, a circuit board assembly, a cover and a wire harness, the motor body is provided with a rotating shaft, the wire harness is welded on the circuit board assembly, the circuit board assembly is fixed on the sleeve assembly, an optical sensor module and a connector are integrated on the circuit board assembly, the sleeve assembly is rigidly connected with the motor body, the shaft sleeve is installed at the rear shaft outlet end of the rotating shaft, the code disc is installed on the shaft sleeve, and the code channel of the code disc is coaxially arranged with the rotating shaft. Compared with the prior art, the application has the advantages of small radial space, high precision and the like.

Description

TECHNICAL FIELD

[0001] The present application relates to a motor structure, in particular to a motor structure with optical encoder. BACKGROUND

[0002] In micro motor, it is required to have a device to detect the position of the motor rotor, and known solutions include the use of magnetic steel and Hall element, magnetic steel and magnetic encoder chip, optical code disc and optical encoder chip to determine the position of the rotor.

[0003] Through search, Japanese patent JP2002357457A provides an optical encoder, a pulse encoder wheel with light modulation track fixed on a rotating shaft is arranged in a gap between encoder sensor modules, a light emitting element and a light receiving element are opposite to each other in the gap, a signal accompanying the rotation of the rotating shaft is obtained, a base member with the encoder sensor module is inserted from a direction orthogonal to the rotating shaft, and can be fixed on a fixed part of the motor housing in a state that the rotating shaft penetrates, as shown in Figure 1 . The base member needs to avoid the motor housing fixed part and the rotating shaft, and increases the radial dimension, which is not conducive to the use of micro motor. The base member is installed on the end face of the motor, which requires that the end face must be flat, and the standard motor end face has convex and concave parts such as bosses or terminals, which limits the use range of the scheme, and the base and the fixed part are connected by screws, and the connection position is between the pulse encoder wheel and the base, which is easy to contaminate and damage the pulse encoder wheel during assembly.

[0004] Chinese patent CN101032065A provides an optical encoder device, a code disc is installed on a rotating shaft extending from a motor part, and a light sensor module is installed on a base plate to position the optical modulation track part of the code disc in the gap of the light sensor module, as shown in Figure 2 . In order to prevent solder particles and flux from splashing during welding and affecting the precision of the light sensor or the code disc, the existing patent increases the axial gap between the base plate and the motor end cover side, increases the axial length of the motor, and affects the welding effect and efficiency between the gaps. SUMMARY

[0005] The purpose of the present application is to overcome the defects of the prior art and provide a motor structure with optical encoder.

[0006] The purpose of the present application can be achieved by the following technical solutions:

[0007] According to one aspect of the present application, a motor structure with an optical encoder is provided, comprising a motor body, a shaft sleeve, a code disc, a sleeve assembly, a circuit board assembly, a cover and a wire harness, the motor body is provided with a rotating shaft, the wire harness is welded on the circuit board assembly, the circuit board assembly is fixed on the sleeve assembly, the circuit board assembly is integrated with an optical sensor module and a connector, the sleeve assembly is rigidly connected with the motor body, the shaft sleeve is installed on the rear shaft end of the rotating shaft, the code disc is installed on the shaft sleeve, and the code track of the code disc is coaxially arranged with the rotating shaft.

[0008] As a preferred technical solution, the circuit board assembly comprises an IC chip and a printed circuit board, and the IC chip and the wire harness are welded on the printed circuit board.

[0009] As a preferred technical solution, the sleeve assembly comprises a sleeve and a mounting bracket, the mounting bracket is injection molded on the sleeve, the printed circuit board is fixed on the mounting bracket, the mounting bracket is made of plastic, and the mounting bracket and the printed circuit board are provided with complementary positioning structures, which comprise mounting bracket protruding structures provided on the mounting bracket and printed circuit board grooves provided on the printed circuit board.

[0010] As a preferred technical solution, the axial height of the mounting bracket protruding structure of the mounting bracket is greater than the thickness of the printed circuit board, and the difference is T;

[0011] The protruding part of the mounting bracket is T higher than the printed circuit board, which is heated and melted to cover the surface of the printed circuit board, forming a press-in fixed.

[0012] As a preferred technical solution, the sleeve is a metal sleeve with a circular ring structure, one end of which is provided with a circular ring surface formed by radial bending, and a plurality of circular ring surface notches are arranged on the circular ring surface.

[0013] As a preferred technical solution, the shaft sleeve is provided with a shaft sleeve flange surface for axially supporting the code disc, and the shaft sleeve flange surface fixes the code disc by gluing;

[0014] The rotating shaft drives the shaft sleeve, and the shaft sleeve drives the code disc by glue to realize dynamic real-time adjustment.

[0015] As a preferred technical solution, the radial gap X between the code disc and the shaft sleeve is greater than the cumulative tolerance of the parts themselves;

[0016] The glue used for gluing does not solidify in indoor and anaerobic environments, and the viscosity is sufficient to drive the code disc to rotate without causing rebound when adjusting the code disc.

[0017] As a preferred technical solution, the cover is installed on the mounting bracket of the sleeve assembly to form a sealed space S with the motor body.

[0018] As a preferred technical scheme, the cover is provided with a cover buckle, the mounting frame is provided with a corresponding number of mounting angle frame grooves, and a mounting frame groove slope is arranged on the mounting frame groove, and the axial angle of the mounting frame groove slope is alpha, preferably alpha < 45 degrees.

[0019] As a preferred technical scheme, the cover and the sleeve assembly are mounted to form a circuit board assembly outlet hole, and the circuit board assembly outlet hole is a sealed outlet hole.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] 1) Because the optical sensor module and the connector are integrated on the circuit board assembly, the radial space is saved, only the size of the code disc needs to be controlled, and the outer diameter of the code disc can be easily made smaller, so the radial size of the structure is small, and it is suitable for micro motors, and motors with an outer diameter of 13mm and 8mm can also meet the requirements;

[0022] 2) The structure of the present application supports real-time adjustment of the code disc, and in the case of real-time adjustment, the coaxiality of the parts themselves and the coaxiality caused by the installation of each part are no longer limited, and the height coaxiality of the code channel and the rotation center can be met (the coaxiality can be controlled in the micron level), and the above-mentioned coaxiality is the most critical factor that limits the output precision, so the precision that can be achieved by the present application is very high, and the integral non-linear precision can reach ±0.1 degrees;

[0023] 3) Because the circuit board assembly and the sleeve assembly are hot riveted, the sleeve assembly and the motor body are rigidly connected, so the present application has good rigidity;

[0024] 4) Easy installation and no pollution of the code disc process. BRIEF DESCRIPTION OF DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the prior art one;

[0026] Figure 2 It is a structural schematic diagram of the prior art two;

[0027] Figure 3 It is an exploded structural schematic diagram of the present application;

[0028] Figure 4 It is a sectional structural schematic diagram of the present application;

[0029] Figure 5 It is an assembly schematic diagram of the sleeve assembly and the circuit board assembly of the present application;

[0030] Figure 6 It is a hot riveting completion schematic diagram of the sleeve assembly and the circuit board assembly of the present application;

[0031] Figure 7This is an exploded structural diagram of the sleeve assembly and cap of the present invention;

[0032] Figure 8 This is a schematic diagram of the inclined surface of the mounting bracket groove of the present invention;

[0033] Figure 9 This is a cross-sectional view of the sleeve assembly and cap assembly of the present invention;

[0034] Figure 10 This is a three-dimensional structural diagram of the sleeve assembly and cap assembly of the present invention.

[0035] The components are: 1. Motor body; 11. Shaft; 2. Bushing; 3. Encoder; 4. Sleeve assembly; 41. Sleeve; 42. Mounting bracket; 5. Circuit board assembly; 51. IC chip; 52. Printed circuit board; 6. Cover; 7. Wire harness; 21. Bushing flange surface; X. Radial clearance; S. Sealed space; 421. Mounting bracket protrusion structure; 521. Printed circuit board groove; T. Part of the mounting bracket protrusion that protrudes above the printed circuit board; 411. Circular surface; 412. Circular surface notch; 422. Mounting angle groove; 4221. Mounting bracket groove slope; 61. Cover buckle; 62. Circuit board assembly wire outlet hole. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0037] like Figure 3 As shown, a motor structure with an optical encoder includes a motor body 1, a bushing 2, a code disk 3, a sleeve assembly 4, a circuit board assembly 5, a cover 6, and a wiring harness 7. The motor body 1 has a rotating shaft 11. The wiring harness 7 is soldered to the circuit board assembly 5, which is fixed to the sleeve assembly 4. The sleeve assembly 4 is rigidly connected to the motor body 1. The bushing 2 is installed at the rear output end of the rotating shaft 11. The code disk 3 is installed on the bushing 2, and the code track of the code disk 3 is coaxially arranged with the rotating shaft 11. The motor structure with the optical encoder of this invention can achieve a line count of 25536 or higher per revolution, with an integral nonlinearity accuracy of ±0.1°.

[0038] The circuit board assembly 5 comprises an IC chip 51 and a printed circuit board 52, the IC chip 51 and the wire harness 7 are welded on the printed circuit board 52, the IC chip, the wire harness and the printed circuit board form the circuit board assembly, and the position of the circuit board assembly needs to be firm and reliable after assembly.

[0039] The sleeve assembly 4 comprises a sleeve 41 and a mounting frame 42, the mounting frame 42 is injection molded on the sleeve 41, the printed circuit board 52 is fixed on the mounting frame 42, the mounting frame 42 is a mounting frame made of plastic, and the mounting frame 42 and the printed circuit board 52 are provided with complementary positioning structures, which comprise mounting frame protruding structures 421 provided on the mounting frame 42 and printed circuit board grooves 521 provided on the printed circuit board 52.

[0040] As shown in Figure 5 and 6 The axial height of the mounting frame protruding structure 421 of the mounting frame 42 is greater than the thickness of the printed circuit board 52, and the difference is T; the protruding part of the mounting frame 42 is higher than the part of the printed circuit board by T, and is melted and fused to cover the surface of the printed circuit board 52, forming a press riveting fixation.

[0041] The sleeve assembly and the motor body are rigidly connected, preferably by welding.

[0042] As shown in Figure 7 and 8 The sleeve 41 is a sleeve made of metal and adopts a circular ring structure, one end of which has a circular ring surface 411 formed by radial bending, and a plurality of circular ring surface notches 412 are arranged on the circular ring surface 411, which ensures the radial and axial bonding force after the mounting frame is injection molded on the sleeve.

[0043] As shown in 4, the shaft sleeve is installed on the rear shaft end of the motor body shaft, and the installation and fixation mode can be selected according to the actual situation, which is not limited by the application. The shaft sleeve 2 is provided with a shaft sleeve flange surface 21 for axially supporting the encoder disc 3, and the encoder disc 3 and the shaft sleeve 2 are radially gap-fitted, the shaft sleeve flange surface 21 fixes the encoder disc 3 by gluing, and the glue used for fixing the encoder disc needs to ensure that the viscosity is sufficient to drive the encoder disc to rotate when it is not cured and does not cure or is difficult to cure at room temperature. The glue is preferably UV glue with appropriate viscosity; the rotating shaft 11 drives the shaft sleeve 2, and the shaft sleeve 2 drives the encoder disc 3 to realize dynamic real-time adjustment.

[0044] The radial gap X between the encoder disc 3 and the shaft sleeve 2 is greater than the cumulative tolerance of the parts themselves, so that the encoder disc can be adjusted to meet the requirement of high coaxiality of the code track and the motor shaft.

[0045] The cover 6 is installed on the mounting frame 42 of the sleeve assembly 4 to form a sealed space S with the motor body 1, which can provide a dust-free environment required by the code disc.

[0046] The cover 6 is provided with a cover buckle 61, and the mounting frame 42 is provided with a corresponding number of mounting corner groove 422, which is a structure of bevel plus arc, facilitating installation, and the mounting frame groove 422 is provided with a mounting frame groove bevel 4221, which has an axial angle α, preferably α < 45°.

[0047] As shown in Figure 9 and 10 The cover 6 and the sleeve assembly 4 form a circuit board assembly outlet hole 62 after installation, which is a sealed outlet hole.

[0048] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical range disclosed by the present application, which should be covered by the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A motor structure with optical encoder, comprising a motor body (1), a shaft sleeve (2), a code disc (3), a sleeve assembly (4), a circuit board assembly (5), a cover (6) and a wire harness (7), the motor body (1) is provided with a rotating shaft (11), the wire harness (7) is welded on the circuit board assembly (5), and the circuit board assembly (5) is fixed on the sleeve assembly (4), characterized in that, The line board assembly (5) is integrated with an optical sensor module and a connector, the sleeve assembly (4) is rigidly connected with the motor body (1), the shaft sleeve (2) is installed on the rear shaft end of the rotating shaft (11), the code disc (3) is installed on the shaft sleeve (2), and the code channel of the code disc (3) is coaxially arranged with the rotating shaft (11). The sleeve assembly (4) comprises a sleeve (41) and a mounting frame (42), the mounting frame (42) is injection molded on the sleeve (41), the printed circuit board (52) is fixed on the mounting frame (42), the mounting frame (42) is a mounting frame made of plastic, and the mounting frame (42) and the printed circuit board (52) are provided with complementary positioning structures, the positioning structures comprise mounting frame protruding structures (421) arranged on the mounting frame (42) and printed circuit board grooves (521) arranged on the printed circuit board (52).

2. An electric motor structure with an optical encoder according to claim 1, characterized in that, The line board assembly (5) comprises an IC chip (51) and a printed circuit board (52), the IC chip (51) and the wire harness (7) are welded on the printed circuit board (52).

3. An electric motor structure with an optical encoder according to claim 1, characterized in that, The axial height of the mounting frame protruding structure (421) of the mounting frame (42) is greater than the thickness of the printed circuit board (52), and the difference is T; The protruding part of the mounting frame (42) is heated and melted by T, and covers the surface of the printed circuit board (52) to form a press-in fixed.

4. An electric motor structure with an optical encoder according to claim 1, characterized in that, The sleeve (41) is a sleeve made of metal and adopts a circular ring structure, one end of the sleeve (41) has a circular ring surface (411) formed by radial bending, and a plurality of circular ring surface notches (412) are arranged on the circular ring surface (411).

5. An electric motor structure with an optical encoder according to claim 1, characterized in that, The shaft sleeve (2) is provided with a shaft sleeve flange surface (21) for axially supporting the code disc (3), and the shaft sleeve flange surface (21) fixes the code disc (3) by gluing; The rotating shaft (11) drives the shaft sleeve (2), and the shaft sleeve (2) drives the code disc (3) to realize dynamic real-time adjustment.

6. An electric motor construction with an optical encoder according to claim 5, characterized in that The radial gap X between the code disc (3) and the shaft sleeve (2) is greater than the accumulated tolerance of the parts themselves. The glue used for gluing does not solidify in indoor and anaerobic environments, and the viscosity is sufficient to drive the code disc to rotate without causing rebound when adjusting the code disc.

7. An electric motor structure with an optical encoder according to claim 1, characterized in that, The cover (6) is installed on the mounting frame (42) of the sleeve assembly (4) to form a sealed space S with the motor body (1).

8. An electric motor structure with an optical encoder according to claim 7, characterized in that, The cover (6) is provided with a cover buckle (61), the mounting frame (42) is provided with a corresponding number of mounting frame grooves (422), the mounting frame grooves (422) are provided with mounting frame groove inclined surfaces (4221), and the mounting frame groove inclined surfaces (4221) form an axial angle α, wherein α < 45°.

9. An electric motor structure with an optical encoder according to claim 1, characterized in that, The cover (6) and the sleeve assembly (4) form a line board assembly wire outlet hole (62) after installation, and the line board assembly wire outlet hole (62) is a wire outlet hole after sealing treatment.

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