High-torque waterproof stepping motor

Abstract

The invention relates to the technical field of motors, in particular to a high-torque waterproof stepping motor, which is characterized in that after the interior of a stator assembly is sealed by epoxy potting glue, the stator assembly is mounted outside a rotor assembly, and a gap between the stator assembly and the rotor assembly is filled with magnetic conductive antirust liquid; the front end of the stator assembly is fixedly provided with a front end cover through a first fastening bolt. The wire outlet end of the stator assembly is installed on the rear end cover and is fixed through a first fastening bolt. The structure is simple, the magnetic field intensity of the motor can be enhanced, the performance of the motor is improved by 10% or more, the cooling capacity of the motor is improved, the effective power of the motor is improved, and motor vibration is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a high-torque waterproof stepping motor. Background Art

[0002] The power system of underwater equipment is currently mainly completed by motors. Since the motor is used underwater, it is usually adopted: traditional mechanical seals, magnetic coupling seals, and self-compensating oil seals, the main purpose of which is to achieve dynamic sealing of the motor shaft. Two solutions are usually adopted. The first solution is that the casing seals the motor as a whole, and static seals are used at the motor outlet. It has the disadvantages of high manufacturing cost, complex structure, and high maintenance cost. Because the motor uses the output shaft to rotate at high speed underwater, the water pressure increases, and the water flow between the motor output shaft and the casing easily penetrates into the motor, causing damage to the internal parts of the motor, and the life of the motor is difficult to guarantee. The second solution: the open underwater motor enlarges the gap between the motor stator and rotor, and sprays a waterproof coating on the surface of the stator assembly and the surface of the rotor assembly to reduce the motor torque; and when installing the motor, the waterproof coating is easily damaged, and the installation process is required to be high, and the cost of the motor increases. Summary of the invention

[0003] The purpose of the present invention is to provide a high-torque waterproof stepping motor with a simple structure to address the defects and shortcomings of the prior art. The motor magnetic field strength can be enhanced, the motor performance can be improved by 10% or more, the motor cooling capacity can be improved, the motor effective power can be increased, and the motor vibration can be reduced.

[0004] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: it comprises a rotor assembly, a stator assembly, a front end cover and a rear end cover; the interior of the stator assembly is sealed with epoxy potting glue, and then the exterior of the rotor assembly is installed, and the gap between the two is filled with magnetic conductive rust-proof liquid; the front end of the stator assembly is fixedly installed with the front end cover by means of a fastening bolt; the outlet terminal of the stator assembly is installed on the rear end cover and fixed by means of a fastening bolt; the front end surface of the stator assembly and the outlet terminal are respectively treated with waterproof and anti-leakage treatment between the front end cover and the rear end cover.

[0005] Preferably, the rotor assembly comprises a rotating shaft, bearings, bushings, rotor laminations and magnets; magnets are provided between the upper and lower groups of rotor laminations and are both sleeved on the rotating shaft, bushings are installed on the outer sides of the upper and lower groups of rotor laminations, bearings are installed on the outer sides of the bushings, the rotating shaft is rotatably connected to the front end cover and the rear end cover respectively by bearings, a skeleton oil seal is provided between the front end cover and the front bearing, and the skeleton oil seal sleeve is provided on the rotating shaft.

[0006] Preferably, the stator assembly comprises a frame, enameled wire, stator laminations, a circuit board and connecting wires; the outer side of the stator laminations is coated with an electrophoretic layer; the front and rear ends of the stator laminations are respectively plugged into the frame, a circuit board is installed in the frame at the rear end, enameled wire is wound around the frame, the connecting wires and the enameled wire are welded to the circuit board, and the epoxy potting glue is filled from the highest point to the lowest point of the stator assembly.

[0007] Preferably, a wire protection sleeve is provided on the upper sleeve of the connecting wire, and a wire protection cover is provided at the position where the wire protection sleeve and the rear end cover penetrate, and the wire protection cover is fixed to the rear end cover by fastening bolts 2.

[0008] Preferably, the stop size of the front end cover is within 0.5 mm.

[0009] Preferably, the stop size of the rear end cover is within 0.5 mm.

[0010] The assembly steps of the present invention are as follows:

[0011] First, the rotor laminations and magnetic steel are pressed together with the rotating shaft to form a semi-finished rotor assembly. After the outer diameter of the rotor laminations of the semi-finished rotor assembly is finely ground, a shaft sleeve is respectively placed on the front and rear shaft outlet parts of the rotating shaft, and then a bearing is pressed and installed to form a rotor assembly.

[0012] After the inner diameter tooth profile of the stator lamination is finely ground, the front and rear ends of the stator lamination are inserted into the frame. According to the specification and performance requirements, the corresponding enameled wire is used to be wound on the frame in order, and the circuit board is fixed on the rear end of the frame. The enameled wire and the connecting wire are fixed by soldering with an electric soldering iron according to the specification requirements to form a semi-finished stator assembly; each enameled wire package of the semi-finished stator assembly is sealed with epoxy potting glue, and the sealing range includes the lowest point to the highest point in the stator assembly, and it is left to stand for a period of time until the epoxy potting glue is fixed;

[0013] Then, install a skeleton oil seal in the front cover, and pay attention to the protection direction of the skeleton oil seal during installation;

[0014] Next, install the rear end cover on the outlet end of the stator assembly, place the rotor assembly vertically into the stator assembly, fill the gap between the stator assembly and the rotor assembly with magnetic conductive rust-proof liquid to increase the magnetic field strength of the motor, then cover the front end cover, use fastening bolt 1 to fix the front end cover, stator assembly and rear end cover, and perform waterproof and leakage-proof treatment on the front end face of the stator assembly and the outlet end between the front end cover and the rear end cover respectively; then put the connecting wire through the wire protection cover, cover the wire protection cover, and use fastening bolt 2 to install and fix the wire protection cover.

[0015] Compared with the prior art, the beneficial effects of the present invention are: the present invention provides a high-torque waterproof stepping motor with a simple structure, which can enhance the motor magnetic field strength, improve the motor performance by 10% or more, improve the motor cooling capacity, increase the motor effective power, and reduce motor vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention.

[0017] Figure 2 It is a structural schematic diagram of the stator assembly in the present invention.

[0018] Figure 3 It is a schematic structural diagram of the rotor assembly in the present invention.

[0019] Figure 4 yes Figure 1 Enlarged view of part A in the middle.

[0020] Figure 5 yes Figure 1 Enlarged view of part B in the middle.

[0021] Description of reference numerals:

[0022] Rotating shaft 1, bearing 2, bushing 3, rotor lamination 4, magnetic steel 5, electrophoretic layer 6, rotor assembly 7, skeleton 8, enameled wire 9, stator lamination 10, epoxy potting glue 11, circuit board 12, connecting wire 13, stator assembly 14, skeleton oil seal 15, front end cover 16, rear end cover 17, fastening bolt one 18, magnetic conductive anti-rust liquid 19, wire protection sleeve 20, wire protection cover 21, fastening bolt two 22. DETAILED DESCRIPTION

[0023] The technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. The preferred embodiments in the description are only used as examples, and all other embodiments obtained by those skilled in the art without making any creative work are within the scope of protection of the present invention.

[0024] like Figure 1-Figure 5 As shown, this specific embodiment adopts the following technical scheme: it includes a rotor assembly 7, a stator assembly 14, a front end cover 16 and a rear end cover 17; the interior of the stator assembly 14 is sealed with epoxy potting glue 11, and then the exterior of the rotor assembly 7 is installed, and the gap between the two is filled with a magnetic conductive rust-proof liquid 19; the front end of the stator assembly 14 is fixedly installed with the front end cover 16 by a fastening bolt 18, and the stop size of the front end cover 16 is changed from the existing conventional 1.2mm to within 0.5mm; the outlet end of the stator assembly 14 is installed on the rear end cover 17 and fixed with a fastening bolt 18; the stop size of the rear end cover 17 is changed from the existing conventional 1.2mm to within 0.5mm;

[0025] The rotor assembly 7 comprises a rotating shaft 1, a bearing 2, a sleeve 3, a rotor lamination 4 and a magnetic steel 5; a magnetic steel 5 is arranged between the upper and lower groups of rotor laminations 4, and both are sleeved on the rotating shaft 1, sleeves 3 are installed on the outer sides of the upper and lower groups of rotor laminations 4, bearings 2 are installed on the outer sides of the sleeves 3, and the bearings 2 are ceramic bearings. The rotating shaft 1 is rotatably connected with the front end cover 16 and the rear end cover 17 respectively by the bearings 2, and a skeleton oil seal 15 is arranged between the front end cover 16 and the front side bearing 2, and the skeleton oil seal 15 is sleeved on the rotating shaft 1;

[0026] The stator assembly 14 comprises a skeleton 8, enameled wires 9, stator laminations 10, a circuit board 12 and connecting wires 13; the outer side of the stator laminations 10 is coated with an electrophoretic layer 6; the front and rear ends of the stator laminations 10 are respectively plugged into the skeleton 8, the circuit board 12 is installed in the skeleton 8 at the rear end, the skeleton 8 is wound with enameled wires 9, the connecting wires 13 and the enameled wires 9 are welded to the circuit board 12, and the epoxy potting glue 11 is filled from the highest point to the lowest point of the stator assembly 14; the stop size of the front end cover 16 is changed from the existing conventional 1.2mm to within 0.5mm; the stop size of the rear end cover 17 is changed from the existing conventional 1.2mm to within 0.5mm, which increases the effective utilization rate of the stator, improves the effective power of the motor, and increases the motor torque;

[0027] The connecting wire 13 is sleeved with a wire protection sleeve 20 , and a wire protection cover 21 is provided at the position where the wire protection sleeve 20 and the rear end cover 17 penetrate each other. The wire protection cover 21 is fixed to the rear end cover 17 by fastening bolts 22 .

[0028] The assembly steps of the present invention are as follows:

[0029] First, the rotor laminations 4 and the magnetic steel 5 are arranged according to Figure 2 The semi-finished rotor assembly is pressed with the rotating shaft 1 in the order shown in the figure to form a semi-finished rotor assembly. After the outer diameter of the rotor lamination 4 is finely ground, the semi-finished rotor assembly is pressed with the rotating shaft 1 in the order shown in the figure to form a semi-finished rotor assembly. Figure 2 It is required that a shaft sleeve 3 is respectively mounted on the front and rear shaft outlet parts of the rotating shaft 1, and then a bearing 2 is pressed and installed to form a rotor assembly 7;

[0030] After the inner diameter tooth profile of the stator lamination 10 is finely ground, the front and rear ends of the stator lamination 10 are inserted into the frame 8. According to the specification and performance requirements, the corresponding enameled wire 9 is used to be wound on the frame 8 in an orderly manner, and the circuit board 12 is fixed on the rear end of the frame 8. The enameled wire 9 and the connecting wire 13 are fixed by welding with an electric soldering iron according to the specification requirements to form a semi-finished stator assembly; each enameled wire package of the semi-finished stator assembly is sealed with epoxy potting glue 11, and the sealing range includes the lowest point to the highest point in the stator assembly 14, and it is left to stand for a period of time until the epoxy potting glue 11 is fixed;

[0031] Then, a skeleton oil seal 15 is installed in the front end cover 16. When installing, attention should be paid to the protection direction of the skeleton oil seal 15;

[0032] Next, install the rear end cover 17 on the outlet end of the stator assembly 14, vertically place the rotor assembly 7 into the stator assembly 14, fill the gap between the stator assembly 14 and the rotor assembly 7 with magnetic conductive rust-proof liquid 19 to increase the magnetic field strength of the motor, then cover the front end cover 16, and use the fastening bolt 18 to fix the front end cover 16, the stator assembly 14, and the rear end cover 17; the front end surface of the stator assembly 14 and the outlet end are respectively treated with waterproof and anti-leakage between the front end cover 16 and the rear end cover 17; then put the connecting wire 13 through the wire protection sleeve 20, cover the wire protection cover 21, and use the fastening bolt 22 to install and fix the wire protection cover 21.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] 1. Ceramic bearings have the advantages of high corrosion resistance, high and low temperature resistance, self-lubricating properties, light weight, good thermal stability, high hardness, good wear resistance, anti-magnetic properties and good electrical insulation, which can increase the service life of the motor when the motor is working underwater and reduce maintenance costs;

[0035] 2. By electrophoresis coating the outer layer of the stator laminations of the high torque waterproof stepper motor, the motor corrosion, electrochemical reaction and mechanical damage are effectively reduced, thus extending the service life of the motor;

[0036] 3. By reasonably sealing the stator assembly of the high torque waterproof stepper motor, the normal operation of the motor can be achieved when the motor is working underwater, without affecting the magnetic field change and magnetic permeability of the motor winding;

[0037] 4. By filling the gap between the stator assembly and the rotor assembly of the high torque waterproof stepper motor with magnetic conductive anti-rust liquid, the magnetic field strength of the motor is enhanced and the effective power of the motor is improved;

[0038] 5. By placing a skeleton oil seal in the front cover of the high torque waterproof stepper motor and installing a wire protection sleeve and a wire protection cover at the outlet hole of the rear cover, the internal structure of the motor is fully sealed, which increases the use environment range of the motor;

[0039] 6. This high-torque waterproof stepper motor effectively utilizes the flexibility of the working medium water to reduce the vibration amplitude of the motor, thereby making the outer surface of the motor more stable during operation; at the same time, it ensures that the internal temperature rise of the motor is reduced, making the motor performance more stable.

[0040] For those skilled in the art, they can modify the technical solutions described in the aforementioned embodiments and make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high torque waterproof stepping motor, characterized by: It comprises a rotor assembly (7), a stator assembly (14), a front end cover (16) and a rear end cover (17); the interior of the stator assembly (14) is sealed with epoxy potting glue (11), and then the exterior of the rotor assembly (7) is installed, and the gap between the two is filled with magnetic conductive rust-proof liquid (19); the front end of the stator assembly (14) is fixedly installed with the front end cover (16) by a fastening bolt (18); the outlet end of the stator assembly (14) is installed on the rear end cover (17) and fixed by a fastening bolt (18); the front end surface of the stator assembly (14) and the outlet end are respectively treated with waterproof and anti-leakage between the front end cover and the rear end cover.

2. A high torque waterproof stepping motor according to claim 1, characterized in that: The rotor assembly (7) comprises a rotating shaft (1), a bearing (2), a sleeve (3), a rotor lamination (4) and a magnetic steel (5); a magnetic steel (5) is arranged between the upper and lower groups of rotor laminations (4), and both are sleeved on the rotating shaft (1); sleeves (3) are installed on the outer sides of the upper and lower groups of rotor laminations (4); bearings (2) are installed on the outer sides of the sleeves (3); the rotating shaft (1) is rotatably connected to the front end cover (16) and the rear end cover (17) respectively by means of the bearings (2); a skeleton oil seal (15) is arranged between the front end cover (16) and the front bearing (2), and the skeleton oil seal (15) is sleeved on the rotating shaft (1).

3. A high torque waterproof stepping motor according to claim 1, characterized in that: The stator assembly (14) comprises a frame (8), enameled wires (9), stator laminations (10), a circuit board (12) and connecting wires (13); the outer side of the stator laminations (10) is coated with an electrophoretic layer (6); the front and rear ends of the stator laminations (10) are respectively plugged into the frame (8); the circuit board (12) is installed in the frame (8) at the rear end; the enameled wires (9) are wound around the frame (8); and the connecting wires (13) and the enameled wires (9) are welded to the circuit board (12).

4. A high torque waterproof stepping motor according to claim 1, characterized in that: The connecting wire (13) is sleeved with a wire protection sleeve (20), and a wire protection cover (21) is provided at the position where the wire protection sleeve (20) and the rear end cover (17) penetrate each other. The wire protection cover (21) is fixed to the rear end cover (17) by means of a second fastening bolt (22).

5. A high torque waterproof stepping motor according to claim 1, characterized in that: The stop size of the front end cover (16) is within 0.5 mm.

6. A high torque waterproof stepping motor according to claim 1, characterized in that: The stop size of the rear end cover (17) is within 0.5 mm.

7. A high torque waterproof stepping motor according to any one of claims 1 to 6, characterized in that: Its assembly steps are as follows: First, the rotor laminations (4) and the magnetic steel (5) are pressed together with the rotating shaft (1) to form a semi-finished rotor assembly. After the outer diameter of the rotor laminations (4) of the semi-finished rotor assembly is finely ground, a shaft sleeve (3) is respectively placed on the front and rear shaft outlet parts of the rotating shaft (1), and then a bearing (2) is pressed and installed to form a rotor assembly (7). After the inner diameter tooth profile of the stator lamination (10) is finely ground, the front and rear ends of the stator lamination (10) are inserted into the frame (8), and the corresponding enameled wire (9) is used to be wound on the frame (8) in an orderly manner according to the specification and performance requirements, and the circuit board (12) is fixed on the frame (8) at the rear end. The enameled wire (9) and the connecting wire (13) are fixed by welding with an electric soldering iron according to the specification requirements to form a stator assembly semi-finished product; each enameled wire package of the stator assembly semi-finished product is sealed with epoxy potting glue (11), and the sealing range includes the lowest point to the highest point in the stator assembly (14), and it is left to stand for a period of time until the epoxy potting glue (11) is fixed; Then, a skeleton oil seal (15) is installed in the front end cover (16), and attention needs to be paid to the protection direction of the skeleton oil seal (15) during installation; Next, the rear end cover (17) is installed at the outlet end of the stator assembly (14), the rotor assembly (7) is vertically placed in the stator assembly (14), and the gap between the stator assembly (14) and the rotor assembly (7) is filled with magnetic conductive anti-rust liquid (19) to increase the magnetic field strength of the motor, and then the front end cover (16) is covered, and the front end cover (16), the stator assembly (14) and the rear end cover (17) are fixed by using the first fastening bolt (18); then the connecting wire (13) is put through the wire protection sleeve (20), the wire protection cover (21) is covered, and the wire protection cover (21) is installed and fixed by using the second fastening bolt (22).

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