CN210578206U - Totally-enclosed torque motor with magnetic gear reducer - Google Patents

Abstract

The utility model discloses a fully enclosed torque motor with a magnetic gear reducer, which comprises a vernier motor, a magnetic gear reducer and a casing; the magnetic gear reducer comprises a disk-shaped structure on the rear side of a rotor shaft, a regulating disk and a second-stage output rotor ;The surface of the disc-shaped structure on the rear side of the rotor shaft is pasted with axially magnetized permanent magnets, and the magnetization directions of the two adjacent permanent magnets are opposite; It is composed of non-magnetic material, and the center is embedded with a magnetic adjusting core distributed along the circumference. The fully enclosed torque motor provided by the utility model can achieve the purpose of isolating the magnetic gear reducer from the main body of the motor, and greatly meet the requirement of motor sealing; at the same time, there is no situation that the vernier motor is locked, the temperature performance is better, and the life of the motor is prolonged. , to ensure the safe operation of the motor, suitable for some working environments with harsh external conditions, to achieve smooth rotation at low speed and high torque.

Description

A fully enclosed torque motor with magnetic gear reducer

technical field

The utility model belongs to the field of low-speed high-torque motors, and more particularly relates to a fully enclosed torque motor with a magnetic gear reducer.

Background technique

With the gradual deepening of oilfield development, high temperature, high pressure and good sealing motors are required in crude oil extraction. Due to the slender characteristics of oil wells, the design size of downhole motors should also be more slender. However, the existing high-temperature motor still adopts the drive scheme of the planetary gear reduction mechanism. Since this scheme relies on the meshing between the gears to achieve the purpose of deceleration, there are problems such as poor bearing capacity and poor reliability.

The Chinese utility model patent "An Electric Submersible Screw Pump Unit and its Reducer" (publication number: CN208890621U, publication date: 2019.05.21) discloses a magnetic gear deceleration structure. The magnetic gear includes an inner rotor, an outer rotor and a casing. The outer stator has a plurality of magnetically conductive materials spaced along its circumference, the outer casing includes a plurality of shell permanent magnets arranged on its inner wall and arranged at a circumferential interval, and the inner rotor includes a circumferentially spaced arrangement on its outer peripheral surface. There are several inner permanent magnets, the number of shell permanent magnets is greater than the number of inner permanent magnets, and the radial magnetization directions of two adjacent shell permanent magnets and two adjacent inner permanent magnets are opposite.

The above-mentioned magnetic gear reducer is designed to be the outer casing, the outer rotor, and the inner rotor in sequence from the outside to the inside. When the inner rotor rotates, the inner air gap will generate a rotating magnetic field coupling through the modulation of the magnetic conductive material on the outer rotor to drive the outer rotor. The rotor rotates, and the function of deceleration can be realized according to the ratio of the number of permanent magnet pole pairs. This structure adopts non-contact transmission, which reduces mechanical loss and heat loss.

However, this structure has its own insurmountable defects. First of all, this structure still has a three-layer structure and two-layer gap, and the design of the structure is relatively complicated, and due to the small diameters of the inner rotor, outer rotor and outer casing, it is difficult to install permanent magnets and iron cores, and the number of installations is small. It is difficult to achieve higher range reduction gear ratios. Not only that, when the motor is in a static state, the permanent magnets on the outer casing and the inner rotor will generate radial force, which will affect the force on the outer casing and the inner rotor. Because the designed casing itself is thin, the life of the casing will be reduced; secondly, This kind of motor does not have good sealing performance for the environment where gas, liquid and solid molecules coexist in the well, and the downhole locked-rotor torque has high requirements. If it cannot be started for a long time, it is easy to cause the locked-rotor current to be too large and the temperature to be too high, which affects the life of the motor and even burns the motor. Case.

Utility model content

In view of the defects of the prior art, the purpose of the present utility model is to provide a fully enclosed torque motor with a magnetic gear reducer, which aims to solve the problems of low output torque, poor sealing and poor high temperature performance of the high temperature downhole motor.

In order to achieve the above purpose, the utility model provides a fully enclosed torque motor with a magnetic gear reducer, including a vernier motor, a magnetic gear reducer and a casing; the vernier motor includes a rotor, a stator and an armature winding; the magnetic gear reducer includes The disk-like structure on the rear side of the rotor shaft, the adjusting disk, and the second-stage output rotor; the surface of the disk-like structure on the rear side of the rotor shaft is pasted with axially magnetized permanent magnets, and the magnetization directions of the two adjacent permanent magnets are opposite; the adjusting disk and the shell Tightly mounted without any gaps, divides the entire motor interior into two chambers where only magnetic coupling exists. In addition, it also includes a rotor bearing, a disc structure bearing on the rear side of the rotor shaft, and an output shaft bearing, which are used to support the motor shaft and make the motor rotate smoothly.

Further, the second-stage output rotor has a disk-shaped structure and an output shaft; the surface of the second-stage output rotor disk-shaped structure is affixed with axially magnetized permanent magnets, and the magnetization directions of two adjacent permanent magnets are opposite.

Further, the main body of the adjusting disk is made of non-magnetic material, and the adjusting magnetic cores distributed along the circumference are embedded in the middle.

Further, the sum of the number of stator slots m of the vernier motor and the number of pole pairs n of the armature winding is equal to the number of pole pairs p of the permanent magnets on the rotor surface. The sum of the number of pole pairs j of the surface-mounted permanent magnets on the disk-shaped structure on the rear side of the rotor shaft and the number k of the surface-mounted permanent magnets on the disk-shaped structure of the second-stage output rotor is equal to the number of tunable magnet cores of the tunable magnetic disk.

Compared with the prior art, the following beneficial effects can be achieved through the above technical solutions conceived by the present utility model:

1. The fully enclosed torque motor with the magnetic gear reducer provided by the present utility model can achieve the purpose of isolating the magnetic gear reducer from the main body of the motor because the adjusting disk divides the motor into two chambers and is installed without gaps. The requirement of motor sealing is realized;

2. The motor provided by the utility model adopts a disc-shaped reducer structure, which reduces the amount of materials and greatly reduces the axial length; and in the locked-rotor state, that is, the output shaft of the magnetic gear reducer is locked and the motor is working normally. , There is only magnetic coupling between the electrode and the reducer, there is no electrical coupling and mechanical contact, so there is no vernier motor stall, the temperature performance is better, the life of the motor is prolonged, and the safe operation of the motor is ensured. It is suitable for some external conditions harsh working environment;

3. The fully enclosed torque motor with magnetic gear reducer provided by the utility model includes a vernier motor and a magnetic gear reducer. The vernier motor generates a large torque at low speed, while the magnetic gear reducer decelerates and increases the torque, so that the The final output torque has lower speed and higher torque.

Description of drawings

1 is a three-dimensional schematic diagram of a fully enclosed torque motor with a magnetic gear reducer provided by the present utility model;

2 is a general view of a fully enclosed torque motor with a magnetic gear reducer provided by the present invention;

3 is a longitudinal mid-slope view of a fully enclosed torque motor with a magnetic gear reducer provided by the present invention;

4 is a side view of a fully enclosed torque motor with a magnetic gear reducer provided by the present utility model;

Attached notes:

1. Shell, 2. Stator, 3. Surface-mounted permanent magnets on rotor shaft, 4. Adjustable disk, 5. Second-stage output rotor disk-like structure, 6. Surface-mounted permanent magnets on the rear side of rotor shaft, 7. Adjustable disk-like structure Magnet core, 8. Surface-mounted permanent magnets on the disc-shaped structure of the second-stage output rotor, 9. Rotor shaft, 10. The second-stage output rotor shaft, 11. Bearings at the disc-shaped structure on the rear side of the rotor shaft, 12, Back cover, 13 , Flange joint, 14, rotor bearing, 15, disc structure on the rear side of rotor shaft, 16, output shaft bearing.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

The utility model provides a fully enclosed torque motor with a magnetic gear reducer, as shown in different views in Figures 1 to 4, comprising a vernier motor, a magnetic gear reducer and a casing 1; the vernier motor includes a rotor, a stator 2 and an armature winding, the surface of the rotor shaft is affixed with permanent magnets 3; the magnetic gear reducer includes a disc-shaped structure 15 on the rear side of the rotor shaft, a regulating disk 4, and a second-stage output rotor; the surface of the disc-shaped structure 15 on the rear side of the rotor shaft is affixed with axial magnetization Permanent magnet 6, the magnetization directions of two adjacent permanent magnets are opposite; the adjusting disk 4 is closely installed with the outer casing without any gap, dividing the entire motor interior into two chambers with only magnetic coupling. In addition, it also includes a rotor bearing 14, a disc-shaped structure bearing 11 on the rear side of the rotor shaft, and an output shaft bearing 16, which are used to support the rotating shaft of the motor and make the motor rotate smoothly.

Further, the second-stage output rotor has a disk-shaped structure 5 and an output shaft; the surface of the second-stage output rotor disk-shaped structure 5 is affixed with axially magnetized permanent magnets 8, and the magnetization directions of two adjacent permanent magnets are opposite.

Further, the main body of the adjusting disk 4 is made of non-magnetic material, and the adjusting magnetic core 7 distributed along the circumference is embedded in the middle.

Further, the sum of the number of stator slots m of the vernier motor and the number of pole pairs n of the armature winding is equal to the number of pole pairs p of the permanent magnets on the rotor surface. The sum of the number of pole pairs j of the surface-mounted permanent magnets on the disk-shaped structure on the rear side of the rotor shaft and the number k of the surface-mounted permanent magnets on the disk-shaped structure of the second-stage output rotor is equal to the number of tunable magnet cores of the tunable magnetic disk. In this specific embodiment, it includes a 6-slot 10-pole vernier motor and the number of pole pairs of permanent magnets attached to the rotor shaft, the number of pole pairs of permanent magnets attached to the surface of the second-stage output rotor, and the number of magnetic cores of the adjusting disk are 2 and 6, respectively. 8's magnetic gear accelerator.

The housing diameter of the motor is 25mm, and the total length of the motor and the reducer is 90mm. The axial length of the vernier motor is 65mm, and the magnetic gear reducer is 25mm.

The main part of the motor is supplied with three-phase alternating current, and the number of pole pairs of the armature coil is 1. Because the rotating magnetic flux generated by the three-phase alternating current acts on the air gap, a rotating magnetic flux is generated in the rotor part, and then a rotating torque is generated, which interacts with the patch permanent magnets on the rotor shaft to generate an inner rotor with a certain speed. The first stage torque is generated, which has higher rotational speed and higher torque. When the disc-shaped structure on the rear side of the rotor connected to the rotor shaft transmits the rotating rotor generated by the first stage to the magnetic gear reducer, a rotating magnetic field is generated on the rear side due to the structure of the surface-mounted permanent magnets distributed along the circumference. The number of harmonic pole pairs of magnetic field rotation is 2. The harmonics act on the tunable magnetic disk with 8 cores. After the modulation of the tunable magnetic disk, a rotating magnetic field with 6 harmonic pole pairs is generated at the disk-shaped structure connected to the second-stage output rotor and the poles attached to its surface. The logarithm of 6 pairs of permanent magnets produces the maximum torque and minimum rotational speed in this case. A corresponding rotational moment is generated to act on the permanent magnets of the outer rotor to generate rotation. At this time, the reducer achieves a reduction ratio of 3:1. The torque has the characteristics of low speed and high torque. In addition, the reduction ratio can be adjusted arbitrarily by changing the number of pole pairs of the magnetic core on the magnetic disk and the number of pole pairs of the permanent magnets on the disk-shaped structure on both sides.

Those skilled in the art can easily understand that the above are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and replacements made within the spirit and principles of the present invention Improvements, etc., should be included within the protection scope of the present invention.

Claims (7)

1. A totally-enclosed torque motor with a magnetic gear reducer is characterized by comprising a vernier motor, a magnetic gear reducer and a shell; the magnetic gear reducer comprises a rotor shaft rear side disc-shaped structure, a magnetic adjusting disc and a second-stage output rotor; the surface of the disk-shaped structure at the rear side of the rotor shaft is pasted with axial magnetizing permanent magnets, and the magnetizing directions of two adjacent permanent magnets are opposite; the magnetic adjusting disc is tightly installed with the shell to divide the whole motor into two chambers.

2. The fully enclosed torque motor of claim 1, wherein said second stage output rotor has a disc-like configuration with an output shaft; the surface of the disc-shaped structure of the second-stage output rotor is pasted with axial magnetizing permanent magnets, and the magnetizing directions of two adjacent permanent magnets are opposite.

3. The totally enclosed torque motor according to claim 1, wherein the disc adjusting body is made of a non-magnetic conductive material, and a circumferentially distributed magnetic adjusting core is embedded in the middle.

4. The totally-enclosed torque motor according to claim 1, further comprising a rotor bearing, a disc-shaped structure bearing at the rear side of the rotor shaft, and an output shaft bearing for supporting the motor shaft to enable the motor to rotate smoothly.

5. The totally enclosed torque motor according to claim 1, wherein the vernier motor comprises a rotor, a stator and an armature winding; the surface of the rotor is pasted with a permanent magnet.

6. The totally enclosed torque motor according to claim 5, wherein the sum of the number m of stator slots of the stator and the number n of pole pairs of the armature winding is equal to the number p of pole pairs of the rotor surface-mounted permanent magnets.

7. The totally-enclosed torque motor according to claim 2, wherein the sum of the number j of pole pairs of the permanent magnets attached to the disc-shaped structure at the rear side of the rotor shaft and the number k of pole pairs of the permanent magnets attached to the disc-shaped structure of the second-stage output rotor is equal to the number of the adjusting magnet cores of the adjusting disc.

Images