CN111953122B

CN111953122B - Low-speed large-torque direct-drive servo motor

Info

Publication number: CN111953122B
Application number: CN201910406869.9A
Authority: CN
Inventors: 苏瑞
Original assignee: Shanghai Fuzan Motor Technology Co ltd
Current assignee: Shanghai Fuzan Motor Technology Co ltd
Priority date: 2019-05-15
Filing date: 2019-05-15
Publication date: 2022-11-18
Anticipated expiration: 2039-05-15
Also published as: CN111953122A

Abstract

The invention belongs to the technical field of motors, and particularly relates to a low-speed high-torque direct-drive servo motor. This directly drive servo motor adopts built-in bearing, has avoided adopting the height that the cross roller bearing has increased the motor, and leads to the restricted problem of motor installation, and between the built-in bearing, has increased the linkage nature between the bearing through connecting between outer tube and the interior sleeve pipe moreover to can rotate through the roller bearing between outer tube and the interior sleeve pipe, thereby increased the slew velocity of pivot, solved among the prior art rotation of bearing be difficult to the linkage and the restricted scheduling problem of installation space of motor.

Description

Low-speed large-torque direct-drive servo motor

Technical Field

The invention belongs to the technical field of motors, and particularly relates to a low-speed high-torque direct-drive servo motor.

Background

The servo motor can control speed and position precision accurately, can convert voltage signals into torque and rotating speed to drive a control object, the rotating speed of a rotor of the servo motor is controlled by input signals and can react quickly, the servo motor is used as an execution element in an automatic control system and has the characteristics of small electromechanical time constant, high linearity, starting voltage and the like, received electric signals can be converted into angular displacement or angular speed on a motor shaft to be output, the servo motor is divided into two categories of direct current servo motors and alternating current servo motors, and the servo motor is mainly characterized in that when the signal voltage is zero, no autorotation phenomenon exists, and the rotating speed is reduced at a constant speed along with the increase of the torque.

The existing direct-drive servo motor uses a crossed roller bearing to increase the height of the motor, so that the installation space of the motor is limited, and the rotation of the bearing is difficult to link by adopting a built-in bearing and a bearing inside the motor, so that the rotating speed of a rotating shaft is too low.

It can be seen that the prior art has at least the following disadvantages: the rotation of the bearing is difficult to be linked and the installation space of the motor is limited.

Therefore, it is necessary to provide a technical means to solve the above-mentioned drawbacks.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a low-speed high-torque direct-drive servo motor so as to solve the problems that the rotation of a bearing is difficult to link, the installation space of the motor is limited and the like in the prior art.

The invention is realized in this way, a low-speed large-torque direct-drive servo motor, comprising:

the rotor assembly comprises an upper end cover, an outer rotor, a rotating shaft and a magnetic ring, the outer rotor is connected to the outer side of the lower end of the upper end cover through screws, the rotating shaft is connected to the middle of the lower end of the upper end cover through screws, the magnetic ring is fixed to the inner side of the outer rotor, the stator assembly comprises a motor stator core and a winding, a motor base and bearings, the motor stator core and the winding are arranged between the rotating shaft and the magnetic ring, the motor base is fixed to the lower end of the outer rotor, the bearings are located on the inner sides of the motor stator core and the winding and vertically and evenly penetrate through the inner sides of the motor stator core and the winding and are rotatably connected to the outer portion of the rotating shaft, annular rotating grooves are formed in the upper end and the lower end of the outer ring and the lower end of the inner ring of each bearing, an outer sleeve and an inner sleeve are rotatably connected between the outer sleeve and the inner sleeve of each bearing, and a roller is connected between the outer sleeve and the inner sleeve on the same horizontal plane in a rolling mode.

Specifically, the lower side of the outer wall of the rotating shaft is fixedly embedded in the rotating shaft in an embedded mode, and an annular groove for inserting the sealing ring is formed in the inner side of the motor base.

Further, the bearing is composed of an outer ring, an inner ring and balls.

Specifically, the thickness between the outer sleeve and the inner sleeve is matched with the diameter of the roller.

Furthermore, the outer sleeve is inserted between the rotating grooves of the outer ring of the bearing and is rotationally connected with the rotating grooves, and the inner sleeve is inserted between the rotating grooves of the inner ring of the bearing and is rotationally connected with the rotating grooves.

Specifically, a rotating gap is reserved between the magnetic ring and the motor stator core and between the magnetic ring and the winding.

Compared with the prior art, the invention has the beneficial effects that:

this directly drive servo motor adopts built-in bearing, has avoided adopting the height that the cross roller bearing has increased the motor, and leads to the restricted problem of motor installation, between the built-in bearing moreover, has increased the linkage nature between the bearing through connecting between outer tube and the interior sleeve pipe to can rotate through the roller bearing between outer tube and the interior sleeve pipe, thereby increased the slew velocity of pivot.

Drawings

FIG. 1 is an overall schematic view of the present invention;

fig. 2 is a partial schematic view a of the bearing of fig. 1 of the present invention.

In the figure: 1-motor base, 2-upper end cover, 3-outer rotor, 4-rotating shaft, 5-sealing ring, 6-annular groove, 7-bearing, 8-motor stator iron core and winding, 9-magnetic ring, 10-inner sleeve, 11-outer sleeve, 12-rolling shaft and 13-rotating groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or intervening elements may also be present.

As shown in fig. 1 to 2, a preferred embodiment of the present invention is a low-speed high-torque direct drive servo motor, including: the magnetic ring 9 is fixed on the inner side of the outer rotor 3, and is integrally processed with the outer rotor 3 on the outer side of the magnetic ring 9 through die-casting by the upper end cover 2, so that the sealing property between the upper end cover 2 and the outer rotor 3 can be improved;

according to the embodiment, the stator assembly comprises a motor stator core and winding 8, a motor base 1 and bearings 7, the motor stator core and winding 8 are arranged between a rotating shaft 4 and a magnetic ring 9, the motor base 1 is fixed at the lower end of an outer rotor 3, at least three bearings 7 are arranged, the bearings 7 are positioned at the inner side of the motor stator core and winding 8, vertically and uniformly penetrate through and are rotatably connected with the outer part of the rotating shaft 4, the upper end and the lower end of the outer ring and the inner ring of each bearing 7 are respectively provided with a ring-shaped rotating groove 13, an outer sleeve 11 and an inner sleeve 10 are rotatably connected between the outer ring and the inner ring of each bearing 7, a rolling shaft 12 is rotatably connected between the outer sleeve 11 and the inner sleeve 10 on the same horizontal plane, each bearing 7 consists of an outer ring, an inner ring and a rolling ball, the thickness between the outer sleeve 11 and the inner sleeve 10 is matched with the diameter of the rolling shaft 12, the outer sleeve 11 is inserted into a rotating groove 13 of an outer ring of the bearing 7 to be rotatably connected with the rotating groove 13, the inner sleeve 10 is inserted into a rotating groove 13 of an inner ring of the bearing 7 to be rotatably connected with the rotating groove 13, a rotating gap is reserved between the magnetic ring 9 and the motor stator core and between the magnetic ring 10 and the winding 8, so that the friction between the magnetic ring 9 and the motor stator core and between the magnetic ring 8 and the winding 8 is reduced, the problem that the motor installation is limited due to the fact that the height of the motor is increased by adopting a crossed roller bearing is avoided by adopting the built-in bearing 7, the linkage between the bearing 7 and the bearing 7 is increased by the outer sleeve 11 and the inner sleeve 10 between the rotating grooves 13, when an inner ring of the bearing 7 rotates with the outer ring through balls, the outer sleeve 11 and the inner sleeve 10 can be driven to rotate, and the outer sleeve 11 and the inner sleeve 10 can rotate through the rolling shaft 12, thereby increasing the rotating speed of the rotating shaft 4 on the motor base 1.

In this embodiment, the sealing ring 5 is fixedly embedded in the lower side of the outer wall of the rotating shaft 4, the annular groove 6 for inserting the sealing ring 5 is formed in the inner side of the motor base 1, and along with the fact that the sealing ring 5 is inserted into the annular groove 6, the sealing performance between the motor base 1 and the rotating shaft 4 can be improved through the sealing ring 5.

The above description is only exemplary of the present invention, and the structure is not limited to the above-mentioned shapes, and any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A low-speed large-torque direct-drive servo motor is characterized by comprising:

the rotor assembly comprises an upper end cover, an outer rotor, a rotating shaft and a magnetic ring, the outer rotor is connected to the outer side of the lower end of the upper end cover through screws, the rotating shaft is connected to the middle of the lower end of the upper end cover through screws, the magnetic ring is fixed to the inner side of the outer rotor, the stator assembly comprises a motor stator core and windings, a motor base and bearings, the motor stator core and the windings are arranged between the rotating shaft and the magnetic ring, the motor base is fixed to the lower end of the outer rotor, the number of the bearings is at least three, the bearings are positioned on the inner sides of the motor stator core and the windings, the bearings vertically and uniformly penetrate through and are rotatably connected to the outer portion of the rotating shaft, annular rotating grooves are formed in the upper end and the lower end of the outer ring and the lower end of the inner ring of each bearing, an outer sleeve and an inner sleeve are rotatably connected between the outer sleeve and the inner ring of each bearing, and a rolling shaft is connected between the outer sleeve and the inner sleeve on the same horizontal plane;

the bearing consists of an outer ring, an inner ring and balls;

the outer sleeve is inserted between the rotating grooves of the bearing outer ring and is rotationally connected with the rotating grooves, and the inner sleeve is inserted between the rotating grooves of the bearing inner ring and is rotationally connected with the rotating grooves.

2. The low-speed high-torque direct-drive servo motor as claimed in claim 1, wherein: the lower side of the outer wall of the rotating shaft is fixedly embedded in the rotating shaft in an embedded mode, and an annular groove for inserting the sealing ring is formed in the inner side of the motor base.

3. A low-speed high-torque direct-drive servo motor as claimed in claim 1, wherein: the thickness between the outer sleeve and the inner sleeve is matched with the diameter of the rolling shaft.

4. The low-speed high-torque direct-drive servo motor as claimed in claim 1, wherein: and a rotating gap is reserved between the magnetic ring and the motor stator core and between the magnetic ring and the winding.