High-precision servo motor

Abstract

The high-precision servo motor comprises a square front shell and a rear sealing shell fixed to the back face of the square front shell, a front shaft seat is fixed to the outer wall of the side, away from the rear sealing shell, of the square front shell, a main shaft is rotationally installed in the front shaft seat, one end of the main shaft extends into the rear sealing shell, and the other end of the main shaft extends into the rear sealing shell. A rear sealing sleeve concentric with the main shaft is fixed to the outer wall of one side of the front shaft seat, and a front sealing sleeve is fixed to the end, away from the front shaft seat, of the rear sealing sleeve. The inner steel ring of the front sealing sleeve is connected with the outer wall of the main shaft to form a closed sealing structure, independent cavities are formed in the positions, close to the front annular lip edge and the two sides of the sealing ring, of the front sealing structure, external dust, water vapor and the like are prevented from entering the motor, and therefore electronic elements, bearings and other components in the motor are protected.

Description

Technical Field

[0001] The utility model relates to the technical field of servo motors, in particular to a high-precision servo motor. Background Art

[0002] High-precision servo motors in medical equipment are an important component and are widely used in various medical devices, such as CT scanners, MRI equipment, X-ray equipment, etc. These motors are used to control the rotation, movement, and focusing of imaging equipment to ensure the accuracy and stability of the imaging process. This type of high-precision servo motor usually consists of two parts: a stator and a rotor. The stator is the stationary part, usually composed of an iron core and a coil. The coil generates a magnetic field through current. The rotor is the rotating part, usually composed of a permanent magnet and a rotor shaft. When working, when the stator is energized to generate a magnetic field, the magnetic field interacts with the permanent magnet on the rotor to generate torque and drive the rotor to rotate. The difference between a high-precision servo motor and a traditional motor is that its rotor is directly connected to the driven load, eliminating the transmission device in a traditional motor, and a high-precision servo motor is usually equipped with a high-precision encoder. Encoders or sensors can realize closed-loop control to monitor the rotor position and speed in real time, thereby achieving high-precision position control and speed control to meet the requirements of various complex motion trajectories. However, the shaft end of the current high-precision servo motor needs to pass through the inside of the shell. At this time, there is a gap between the rotor shaft and the inner wall of the shell shaft end, which will lead to insufficient mechanical strength and sealing of the shell. Especially at high-speed rotation, the gap between the rotor shaft and the shell shaft end will produce vibration and axial displacement, resulting in the rotor and the shell The fit is not tight enough, affecting the stability and reliability of the whole machine. At the same time, this part of the gap will also cause dust from the external environment to enter the bearing and the motor, affecting the normal operation of the motor. Utility Model Content

[0003] The purpose of the utility model is to provide a high-precision servo motor, in which a front sealing sleeve and a rear sealing sleeve are added to the end of a square front shell, which can be fitted and connected to each other, and a steel ring for contacting the outer wall of the main shaft is rotatably installed inside the front sealing sleeve, so as to solve the problems raised in the above-mentioned background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a high-precision servo motor, comprising a square front shell and a rear sealing shell fixed on the back of the square front shell, a front axle seat is fixed on the outer wall of the square front shell on the side away from the rear sealing shell, and a main shaft is rotatably installed inside the front axle seat, one end of the main shaft extends to the interior of the rear sealing shell, a rear sealing sleeve concentric with the main shaft is fixed on the outer wall of one side of the front axle seat, a front sealing sleeve is fixed on the end of the rear sealing sleeve away from the front axle seat, a front annular lip is integrally formed on the top of the front sealing sleeve, a steel ring is rotatably installed inside the front sealing sleeve through an annular rotating structure, the inner wall of the steel ring is fixedly connected to the outer wall of the main shaft, and a sealing ring is inlaid on the end of the rear sealing sleeve close to the front sealing sleeve.

[0005] Preferably, an outer stator is fixed on the inner wall of the rear sealing shell, and a permanent magnet rotor is installed on the inner wall of the outer stator; an inner stator is installed on one end of the surface of the main shaft, and a winding is installed on the outer surface of the inner stator.

[0006] Preferably, a front end cover and a rear end cover are respectively fixed to both ends of the interior of the rear sealing shell, and the outer stator is fixed between the front end cover and the rear end cover.

[0007] Preferably, the outer walls of the front cover and the rear cover are both provided with straight-mouthed hollow grooves.

[0008] Preferably, a docking sleeve is fixed to one end of the front sealing sleeve close to the rear sealing sleeve, the docking sleeve and the rear sealing sleeve are slidably connected, and flange plate 2 and flange plate 1 are respectively installed on one end of the surface of the docking sleeve and the rear sealing sleeve, and flange plate 2 and flange plate 1 are bolted to each other.

[0009] Preferably, a plurality of springs are installed at equal intervals on an inner wall of one side of the docking sleeve, and one end of the spring is fixedly connected to an outer wall of one side of the rear sealing sleeve.

[0010] Preferably, the annular rotating structure includes an annular lip fixed on the outer wall of the steel ring, and an annular groove arranged on the inner wall of the front sealing sleeve, and the annular lip and the annular groove are rotatably connected.

[0011] Compared with the prior art, the beneficial effect of the utility model is as follows: the high-precision servo motor is provided with a steel ring and a front sealing sleeve and other structures that cooperate with each other. The steel ring serves as the second sealing surface on the main shaft, and the front annular lip serves as the first sealing surface at the front end of the front sealing sleeve, and the sealing ring serves as the third sealing surface. At this time, the internal steel ring of the front sealing sleeve is connected to the outer wall of the main shaft to form an airtight sealing structure. The front sealing structure is close to the front annular lip and the sealing ring on both sides to form independent cavities, which prevent external dust, water vapor, etc. from entering the interior of the motor, thereby protecting the electronic components and bearings inside the motor and extending the service life of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a three-dimensional cross-sectional structural schematic diagram of the utility model;

[0013] Figure 2 This is a schematic diagram of the main cross-sectional structure of the utility model;

[0014] Figure 3 It is a three-dimensional structural schematic diagram of the utility model;

[0015] Figure 4 It is a schematic diagram of the three-dimensional structure of the front sealing sleeve and the rear sealing sleeve of the utility model;

[0016] In the figure: 1, square front shell; 2, rear sealing shell; 3, front end cover; 4, rear end cover; 5, outer stator; 6, permanent magnet rotor; 7, inner stator; 8, winding; 9, main shaft; 10, front shaft seat; 11, rear sealing sleeve; 1101, flange one; 12, front sealing sleeve; 1201, front annular lip; 1202, annular slide groove; 13, steel ring; 1301, annular lip; 14, sealing ring; 15, docking sleeve; 1501, flange two; 16, spring. 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. Based on the embodiments in 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] See also Figure 1-4 The utility model provides an embodiment: a high-precision servo motor, comprising a square front shell 1 and a rear sealing shell 2 fixed to the back of the square front shell 1, a front shaft seat 10 is fixed on the outer wall of the square front shell 1 away from the rear sealing shell 2, and a main shaft 9 is rotatably installed inside the front shaft seat 10, one end of the main shaft 9 extends to the inside of the rear sealing shell 2, and a rear sealing sleeve 11 concentric with the main shaft 9 is fixed on the outer wall of one side of the front shaft seat 10;

[0019] A front sealing sleeve 12 is fixed to one end of the rear sealing sleeve 11 away from the front axle seat 10, and a front annular lip 1201 is integrally formed at the top of the front sealing sleeve 12. A steel ring 13 is rotatably installed inside the front sealing sleeve 12 through an annular rotating structure, and the inner wall of the steel ring 13 is fixedly connected to the outer wall of the main shaft 9. The steel ring 13 rotates relative to the front sealing sleeve 12 through the annular rotating structure, and a sealing ring 14 is embedded at one end of the rear sealing sleeve 11 close to the front sealing sleeve 12;

[0020] The front annular lip 1201 and the sealing ring 14 serve as the first and third sealing surfaces of the front sealing sleeve 12, respectively, forming a double sealing protection, ensuring the sealing performance between the front sealing sleeve 12, the rear sealing sleeve 11 and the main shaft 9, and improving the stability and reliability of the motor;

[0021] An outer stator 5 is fixed on the inner wall of the rear sealed shell 2, and a permanent magnet rotor 6 is installed on the inner wall of the outer stator 5. A front cover 3 and a rear cover 4 are respectively fixed at both ends of the interior of the rear sealed shell 2. The outer stator 5 is fixed between the front cover 3 and the rear cover 4. Straight hollow grooves are provided on the outer walls of the front cover 3 and the rear cover 4.

[0022] An inner stator 7 is installed at one end of the surface of the main shaft 9, and a winding 8 is installed on the outer surface of the inner stator 7. When the coil on the outer stator 5 is energized, the generated magnetic field interacts with the magnetic field of the permanent magnet rotor 6 to generate torque, driving the rotor to rotate. At the same time, the winding 8 on the inner stator 7 is also energized to generate a magnetic field, which interacts with the magnetic field of the outer stator 5 to generate electromagnetic force, driving the rotor to rotate. The rotational power of the rotor is transmitted to the external load through the main shaft 9 to achieve the working task of the motor;

[0023] A docking sleeve 15 is fixed to one end of the front sealing sleeve 12 close to the rear sealing sleeve 11, and the docking sleeve 15 and the rear sealing sleeve 11 are slidably connected. A second flange 1501 and a first flange 1101 are respectively installed on one end of the surface of the docking sleeve 15 and the rear sealing sleeve 11. The second flange 1501 and the first flange 1101 are bolted to each other. A plurality of springs 16 are evenly spaced and installed on the inner wall of one side of the docking sleeve 15. One end of the spring 16 is fixedly connected to the outer wall of one side of the rear sealing sleeve 11.

[0024] When installing the front sealing sleeve 12 and the rear sealing sleeve 11, the front sealing sleeve 12 is connected with the rear sealing sleeve 11 through the docking sleeve 15 in the direction of the rear sealing sleeve 11. At this time, the spring 16 is in a compressed state, and then the flange plate 2 1501 and the flange plate 1 1101 are connected by bolts. At this time, the front sealing sleeve 12, the docking sleeve 15, and the rear sealing sleeve 11 form a complete sealing cavity;

[0025] The annular rotating structure includes an annular lip 1301 fixed on the outer wall of the steel ring 13, and an annular groove 1202 arranged on the inner wall of the front sealing sleeve 12. The annular lip 1301 and the annular groove 1202 are rotatably connected. When the main shaft 9 rotates at high speed, the steel ring 13 rotates in the annular groove 1202 of the front sealing sleeve 12 through the annular lip 1301, which reduces the friction between the front sealing sleeve 12 and the main shaft 9, and can reduce the vibration and axial displacement inside the motor, thereby ensuring the stability of the motor during operation.

[0026] When the embodiment of the present application is in use, first, the outer stator 5 is the stationary part of the motor, which is composed of an iron core and a coil. The coil generates a magnetic field through the current. This magnetic field interacts with the magnetic field of the permanent magnet rotor 6 to generate a torque. The permanent magnet rotor 6 is the rotating part of the motor, which is composed of a permanent magnet and a rotor shaft. The permanent magnet generates a constant magnetic field, which interacts with the magnetic field of the outer stator 5 to generate a torque to drive the rotor to rotate. The inner stator 7 is located inside the permanent magnet rotor 6. The winding 8 is powered by an external power supply to generate a magnetic field opposite to the outer stator 5. It interacts with the magnetic field of the outer stator 5 to generate an electromagnetic force to drive the rotor and the main shaft 9 to rotate. When the main shaft 9 is driven to rotate, due to the main shaft 9 and the steel ring 13 Fixed connection, the main shaft 9 drives the steel ring 13 to rotate together, and the steel ring 13 rotates relative to the front sealing sleeve 12 through the annular rotating structure. At this time, the steel ring 13 serves as the second sealing surface on the main shaft 9, and the front annular lip 1201 serves as the first sealing surface at the front end of the front sealing sleeve 12, and the sealing ring 14 serves as the third sealing surface. At this time, the internal steel ring 13 of the front sealing sleeve 12 is connected to the outer wall of the main shaft 9 to form a closed sealing structure. The front sealing structure is close to the front annular lip 1201 and the sealing ring 14 on both sides to form independent cavities, which prevent external dust, water vapor, etc. from entering the interior of the motor, thereby protecting the electronic components and bearings inside the motor and extending the service life of the motor.

[0027] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A high-precision servo motor, characterized in that: The invention comprises a square front shell (1) and a rear sealing shell (2) fixed on the back of the square front shell (1), a front axle seat (10) being fixed on the outer wall of the square front shell (1) on the side away from the rear sealing shell (2), and a main shaft (9) being rotatably mounted inside the front axle seat (10), one end of the main shaft (9) extending into the interior of the rear sealing shell (2), a rear sealing sleeve (11) being concentric with the main shaft (9) being fixed on the outer wall of one side of the front axle seat (10), a front sealing sleeve (12) being fixed on the end of the rear sealing sleeve (11) away from the front axle seat (10), a front annular lip (1201) being integrally formed at the top end of the front sealing sleeve (12), a steel ring (13) being rotatably mounted inside the front sealing sleeve (12) via an annular rotating structure, the inner wall of the steel ring (13) being fixedly connected to the outer wall of the main shaft (9), and a sealing ring (14) being embedded at the end of the rear sealing sleeve (11) close to the front sealing sleeve (12).

2. A high-precision servo motor according to claim 1, characterized in that: An outer stator (5) is fixed on the inner wall of the rear sealed shell (2), and a permanent magnet rotor (6) is mounted on the inner wall of the outer stator (5); an inner stator (7) is mounted on one end of the surface of the main shaft (9), and a winding (8) is mounted on the outer surface of the inner stator (7).

3. A high-precision servo motor according to claim 2, characterized in that: A front end cover (3) and a rear end cover (4) are respectively fixed at the two ends inside the rear sealing shell (2), and the outer stator (5) is fixed between the front end cover (3) and the rear end cover (4).

4. A high-precision servo motor according to claim 3, characterized in that: The outer walls of the front end cover (3) and the rear end cover (4) are both provided with straight hollow grooves.

5. The high-precision servo motor according to claim 1, characterized in that: A docking sleeve (15) is fixed to one end of the front sealing sleeve (12) close to the rear sealing sleeve (11); the docking sleeve (15) and the rear sealing sleeve (11) are slidably connected; one end of the surfaces of the docking sleeve (15) and the rear sealing sleeve (11) are respectively installed with a flange plate 2 (1501) and a flange plate 1 (1101); the flange plate 2 (1501) and the flange plate 1 (1101) are bolted to each other.

6. A high-precision servo motor according to claim 5, characterized in that: A plurality of springs (16) are installed at equal intervals on an inner wall of one side of the docking sleeve (15), and one end of the spring (16) is fixedly connected to an outer wall of one side of the rear sealing sleeve (11).

7. The high-precision servo motor according to claim 1, characterized in that: The annular rotating structure comprises an annular lip (1301) fixed on the outer wall of the steel ring (13), and an annular slide groove (1202) arranged on the inner wall of the front sealing sleeve (12), and the annular lip (1301) and the annular slide groove (1202) are rotatably connected.

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