Servo motor

Abstract

The utility model provides a servo motor, and belongs to the technical field of machinery. The servo motor solves the problems that an existing servo motor is not high in accuracy and short in service life. The servo motor comprises a shell, a front end cover and a rear end cover, a stator, a rotor and a rotating shaft are arranged in the shell, a protective cover is fixedly connected to the outer side of the rear end cover, an encoder is arranged in the protective cover and comprises a connecting base fixedly connected to the rear end cover, a connecting sleeve is fixedly connected in the connecting base in the axial direction, and the inner end of the connecting sleeve is fixedly connected with the inner end of the rotating shaft. The outer side of the connecting base is sleeved and fixedly connected with an inner shell, a circuit board is fixedly connected in the inner shell, a light source base is arranged on the connecting base in a penetrating mode, an infrared light tube is fixedly connected in the light source base, and a disc-shaped movable grating is coaxially and fixedly connected to the connecting sleeve. The servo motor has the advantages of high precision, good stability and long service life.

Description

Technical Field

[0001] The utility model belongs to the technical field of machinery and relates to a servo motor. Background Art

[0002] A servo motor is an engine that controls the operation of mechanical components in a servo system. It is an auxiliary motor indirect speed change device. The servo motor can control speed and position with high accuracy, and can convert voltage signals into torque and speed to drive the controlled object.

[0003] For example, a servo motor disclosed in a Chinese patent document (application number: 201821867836.1) includes a stator, a rotor, a pressure plate, a pin, an end cover, an encoder, a junction box and a fan. The stator and the rotor are mutually adapted and installed. The stator includes a stator core and a winding, and the rotor includes a rotor core and a rotating shaft. The stator and the rotor are provided with a pressure plate and an end cover at both ends, respectively. The upper part of the stator is connected to a junction box. The encoder is installed at the rear end of the motor shaft, and the fan is installed on the wind shield, which is locked and fixed to the rear pressure plate. However, the encoder of the servo motor is installed at the rear end of the rotating shaft. During installation, there is an installation error between the encoder and the rotating shaft, which affects the accuracy and service life. Summary of the invention

[0004] The utility model aims to solve the above problems in the prior art and proposes a servo motor with high precision, good stability and long service life.

[0005] The purpose of the utility model can be achieved through the following technical solutions: a servo motor comprises a shell, a front end cover and a rear end cover, wherein a stator, a rotor and a rotating shaft are arranged in the shell, and the two ends of the rotating shaft extend out of the front end cover and the rear end cover respectively, and is characterized in that a protective cover is fixedly connected to the outer side of the rear end cover, an encoder is arranged in the protective cover, the encoder comprises a connecting seat fixedly connected to the rear end cover, a connecting sleeve is axially fixedly connected in the connecting seat, the inner end of the connecting sleeve is fixedly connected to the inner end of the rotating shaft, an inner shell is sleeved and fixedly connected to the outer side of the connecting seat, a circuit board is fixedly connected in the inner shell, a light source seat is penetrated through the connecting seat, an infrared light tube is fixedly connected in the light source seat, a disc-shaped moving grating is coaxially fixedly connected to the connecting sleeve, a fixed grating is fixedly connected to the connecting seat, the infrared light tube faces the fixed grating and the moving grating, a photoelectric element is arranged on the circuit board and the photoelectric element can sense the infrared light of the infrared light tube.

[0006] When working, the rotor drives the shaft to rotate, and the shaft drives the connecting sleeve and the moving grating to rotate. The infrared light tube emits infrared light through the fixed grating and the moving grating. The infrared light passing through the fixed grating and the moving grating is sensed by the photoelectric element on the circuit board to determine the rotation angle of the shaft. It has the advantages of high precision, good stability and long service life.

[0007] In the above servo motor, the inner shell is provided with a through strip hole, and the light source seat passes through the strip hole and is fixedly connected by a threaded structure. The light source seat passes through the strip hole and is fixedly connected by a threaded structure, which has the advantages of simple structure and convenient adjustment of the position of the light source seat.

[0008] In the above servo motor, a graphite sleeve is provided between the connecting sleeve and the connecting seat, the side of the graphite sleeve is evenly provided with mounting holes, and graphite is embedded in the mounting holes. By providing the above graphite sleeve, the connecting sleeve is convenient to rotate relative to the connecting seat.

[0009] In the above servo motor, the inner end of the connecting sleeve has a tapered hole, the inner end of the rotating shaft has an outer cone and the outer cone is embedded in the tapered hole. The connecting sleeve is connected to the rotating shaft by embedding the outer cone in the tapered hole, which has the advantages of good connection effect and reliable structure.

[0010] In the above servo motor, a convex lens is provided on the light source seat and the convex lens is located outside the infrared light tube. By providing the convex lens, the infrared light emitted by the infrared light tube is concentrated, which has the advantages of stable and reliable operation.

[0011] In the above-mentioned servo motor, two sets of aviation plugs are provided on the housing.

[0012] Compared with the prior art, this servo motor has the following advantages:

[0013] 1. The infrared light passing through the fixed grating and the moving grating is sensed by the photoelectric element on the circuit board to determine the rotation angle of the shaft, which has the advantages of high precision, good stability and long service life;

[0014] 2. The light source seat passes through the strip hole and is fixedly connected through a threaded structure, which has the advantages of simple structure and easy adjustment of the position of the light source seat;

[0015] 3. A graphite sleeve is provided between the connecting sleeve and the connecting seat. The sides of the graphite sleeve are evenly provided with mounting holes, and graphite is embedded in the mounting holes to facilitate the rotation of the connecting sleeve relative to the connecting seat;

[0016] 4. The connecting sleeve is connected to the rotating shaft by embedding the outer cone into the tapered hole, which has the advantages of good connection effect and reliable structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the servo motor.

[0018] Figure 2 This is a cross-sectional schematic diagram of the servo motor.

[0019] Figure 3 yes Figure 2 AA cross-sectional view of .

[0020] Figure 4 yes Figure 2 B is a partial enlarged schematic diagram.

[0021] In the figure, 1, shell; 2, front cover; 3, rear cover; 4, stator; 5, rotor; 6, rotating shaft; 7, protective cover; 8, encoder; 9, connecting seat; 9a, strip hole; 10, connecting sleeve; 10a, conical hole; 11, inner shell; 12, circuit board; 13, light source seat; 14, infrared light tube; 15, moving grating; 16, fixed grating; 17, photoelectric element; 18, graphite sleeve; 19, graphite; 20, convex lens; 21, aviation plug. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] like Figures 1 to 4 As shown, the servo motor comprises a housing 1 , a front end cover 2 and a rear end cover 3 , and the housing 1 is provided with two sets of aviation plugs 21 . A stator 4, a rotor 5 and a rotating shaft 6 are arranged in the shell 1, and the two ends of the rotating shaft 6 extend out of the front cover 2 and the rear cover 3 respectively. The shell 1 is characterized in that a protective cover 7 is fixedly connected to the outer side of the rear cover 3, and an encoder 8 is arranged in the protective cover 7. The encoder 8 includes a connecting seat 9 fixedly connected to the rear cover 3, a connecting sleeve 10 is axially fixedly connected in the connecting seat 9, and the inner end of the connecting sleeve 10 is fixedly connected to the inner end of the rotating shaft 6. An inner shell 11 is sleeved and fixedly connected to the outer side of the connecting seat 9, and a circuit board 12 is fixedly connected to the inner shell 11. A light source seat 13 is penetrated on the connecting seat 9, and an infrared light tube 14 is fixedly connected in the light source seat 13. A disc-shaped moving grating 15 is coaxially fixedly connected to the connecting sleeve 10, and a fixed grating 16 is fixedly connected to the connecting seat 9. The infrared light tube 14 faces the fixed grating 16 and the moving grating 15. A photoelectric element 17 is arranged on the circuit board 12 and the photoelectric element 17 can sense the infrared light of the infrared light tube 14.

[0024] The connecting seat 9 is provided with a through-hole 9a, and the light source seat 13 passes through the hole 9a and is fixedly connected by a threaded structure, which has the advantages of simple structure and convenient adjustment of the position of the light source seat 13. The light source seat 13 is provided with a convex lens 20 and the convex lens 20 is located outside the infrared light tube 14.

[0025] A graphite sleeve 18 is provided between the connecting sleeve 10 and the connecting seat 9, and mounting holes are evenly distributed on the side of the graphite sleeve 18, and graphite 19 is embedded in the mounting holes. The inner end of the connecting sleeve 10 has a tapered hole 10a, and the inner end of the rotating shaft 6 has an outer cone portion and the outer cone portion is embedded in the tapered hole 10a.

[0026] During operation, the rotor 5 drives the shaft 6 to rotate, and the shaft 6 drives the connecting sleeve 10 and the moving grating 15 to rotate. The infrared light tube 14 emits infrared light that passes through the fixed grating 16 and the moving grating 15. The infrared light that passes through the fixed grating 16 and the moving grating 15 is sensed by the photoelectric element 17 on the circuit board 12 to determine the rotation angle of the shaft 6. It has the advantages of high precision, good stability and long service life. By setting a convex lens 20, the infrared light emitted by the infrared light tube 14 is concentrated, which has the advantages of stable and reliable operation. The outer cone is embedded in the tapered hole 10a, so that the connecting sleeve 10 is connected to the shaft 6, which has the advantages of good connection effect and reliable structure.

[0027] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0028] Although this article uses more terms such as housing 1, front cover 2, rear cover 3, stator 4, rotor 5, rotating shaft 6, protective cover 7, encoder 8, connecting seat 9, bar hole 9a, connecting sleeve 10, tapered hole 10a, inner shell 11, circuit board 12, light source seat 13, infrared light tube 14, moving grating 15, fixed grating 16, photoelectric element 17, graphite sleeve 18, graphite 19, convex lens 20, aviation plug 21, etc., it does not exclude the possibility of using other terms. The use of these terms is only for more convenient description and explanation of the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A servo motor, comprising a housing (1), a front cover (2) and a rear cover (3), wherein a stator (4), a rotor (5) and a rotating shaft (6) are arranged in the housing (1), and two ends of the rotating shaft (6) extend out of the front cover (2) and the rear cover (3) respectively, characterized in that: The outer side of the rear end cover (3) is fixedly connected with a protective cover (7), and an encoder (8) is arranged inside the protective cover (7). The encoder (8) comprises a connecting seat (9) fixedly connected to the rear end cover (3), and a connecting sleeve (10) is axially fixedly connected inside the connecting seat (9), and the inner end of the connecting sleeve (10) is fixedly connected to the inner end of the rotating shaft (6). The outer side of the connecting seat (9) is sleeved with and fixedly connected with an inner shell (11), and a circuit board (12) is fixedly connected inside the inner shell (11). A light source seat (13) is provided on the connection seat (9), an infrared light tube (14) is fixedly connected inside the light source seat (13), a disc-shaped moving grating (15) is coaxially fixedly connected to the connection sleeve (10), a fixed grating (16) is fixedly connected to the connection seat (9), the infrared light tube (14) faces the fixed grating (16) and the moving grating (15), and a photoelectric element (17) is provided on the circuit board (12), and the photoelectric element (17) can sense the infrared light of the infrared light tube (14).

2. The servo motor according to claim 1, characterized in that: The connecting seat (9) is provided with a through strip hole (9a), and the light source seat (13) passes through the strip hole (9a) and is fixedly connected via a threaded structure.

3. The servo motor according to claim 1 or 2, characterized in that: A graphite sleeve (18) is provided between the connecting sleeve (10) and the connecting seat (9), and mounting holes are evenly distributed on the sides of the graphite sleeve (18), and graphite (19) is embedded in the mounting holes.

4. The servo motor according to claim 1 or 2, characterized in that: The inner end of the connecting sleeve (10) has a tapered hole (10a), and the inner end of the rotating shaft (6) has an outer tapered portion, and the outer tapered portion is embedded in the tapered hole (10a).

5. The servo motor according to claim 1 or 2, characterized in that: A convex lens (20) is provided on the light source seat (13), and the convex lens (20) is located outside the infrared light tube (14).

6. The servo motor according to claim 1 or 2, characterized in that: The housing (1) is provided with two sets of aviation plugs (21).

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