CN114337054B - A motor capable of resisting high overload axial impact load - Google Patents

Abstract

The present invention proposes a motor capable of resisting high overload axial impact loads, comprising: a housing, a stator assembly, an end cover and a rotor assembly; the housing is a cylindrical structure, one end of the housing is open, and a first bearing chamber is arranged at the other end, and a first bearing is arranged on the inner side of the first bearing chamber; the stator assembly is arranged on the inner side of the housing, and an elastic cylindrical pin is arranged between the stator assembly and the housing; the end cover is arranged at the open end of the housing, a second bearing chamber is arranged on the inner side of the end cover, a second outer cylindrical surface and a second inner cylindrical surface are arranged at the bottom of the second bearing chamber, and a second bearing is arranged on the inner side of the second bearing chamber, and the outer ring of the second bearing is pressed against the second outer cylindrical surface, and the height difference between the second outer cylindrical surface and the second inner cylindrical surface is less than the axial clearance of the second bearing; the rotor assembly passes through the interior of the stator assembly, and the two ends of the rotor assembly pass through the first bearing and the second bearing respectively, and directly or indirectly press against the inner ring of the first bearing and the inner ring of the second bearing respectively through the shaft shoulders at the two ends.

Description

A motor capable of resisting high overload axial impact load

Technical Field

The invention relates to the technical field of motors, and in particular to a motor capable of resisting high overload axial impact loads.

Background Art

With the rapid development of science and technology, in future local wars, the battle for air supremacy is often the key to determine the outcome of the war. Air-to-air missiles have become the main weapon for fighting for air supremacy and air confrontation with their small size, light weight, and maneuverability. As the actuator of the missile system, the servo has put forward higher and higher requirements on its performance. Not only must it perform corresponding actions according to the commands of the controller and adjust the flight attitude of the missile, but it must also be able to work reliably under high-intensity shock and vibration conditions in the outside world to ensure accurate and effective strikes of missiles in complex environmental conditions. Therefore, the development of lightweight motors that are resistant to high-intensity shock and vibration and can adapt to complex environmental conditions is of great significance to ensure that missiles can achieve effective strikes and fight for air supremacy.

Summary of the invention

In view of this, an object of the present invention is to provide a motor capable of resisting high overload axial impact loads, so as to overcome the above problems or at least partially solve or alleviate the above problems.

The present invention provides a motor capable of resisting high overload axial impact load, comprising:

A housing, wherein the housing is in a cylindrical structure, one end of the housing is open, and the other end is provided with a first bearing chamber, and a first bearing is provided inside the first bearing chamber;

A stator assembly, wherein the stator assembly is arranged on the inner side of the housing, and an elastic cylindrical pin is arranged between the stator assembly and the housing;

An end cover, wherein the end cover is arranged at the open end of the housing, a second bearing chamber is arranged on the inner side of the end cover, a second outer cylindrical surface and a second inner cylindrical surface are arranged on the bottom of the second bearing chamber, the second outer cylindrical surface and the second inner cylindrical surface form an annular step, a second bearing is arranged on the inner side of the second bearing chamber, an outer ring of the second bearing is placed on the second outer cylindrical surface, and a height difference between the second outer cylindrical surface and the second inner cylindrical surface is smaller than an axial clearance of the second bearing;

A rotor assembly, wherein the rotor assembly passes through the interior of the stator assembly, and both ends of the rotor assembly pass through the first bearing and the second bearing respectively, and the shaft shoulder of the rotor assembly directly or indirectly presses against the inner ring of the first bearing and the inner ring of the second bearing respectively.

The present invention also has the following optional features.

Optionally, an inner ring gasket is arranged between the shaft shoulder of the rotor assembly and the inner ring of the second bearing.

Optionally, the bottom of the first bearing chamber is a plane, an outer ring gasket is provided at the bottom of the first bearing chamber, the outer ring of the first bearing is placed on the outer ring gasket, and the thickness of the outer ring gasket is smaller than the axial clearance of the first bearing.

Optionally, a first outer cylindrical surface and a first inner cylindrical surface are provided at the bottom of the first bearing chamber, the outer ring of the first bearing is placed on the first outer cylindrical surface, and the height difference between the first outer cylindrical surface and the first inner cylindrical surface is smaller than the axial clearance of the first bearing.

Optionally, the end cover is nested in the open end of the shell, and a solid cylindrical pin is provided between the end cover and the side wall of the shell.

Optionally, it also includes a position magnetic steel component and a Hall plate component, wherein the Hall plate component is arranged on the outside of the end cover, and the position magnetic steel component is assembled on one end of the rotating shaft of the rotor assembly passing through the end cover.

Optionally, a countersunk hole is provided in the middle of the position magnetic steel assembly, and the countersunk hole cooperates with the end of the rotating shaft of the rotor assembly, and is connected to the end of the rotating shaft of the rotor assembly through screws, spring washers and flat washers.

Optionally, a tail cover is further included, and the tail cover is connected to the end cover through an axial screw passing through the Hall plate assembly.

The motor capable of resisting high overload axial impact load of the present invention has the following beneficial effects:

1. Compared with ordinary motors, it can withstand high overload axial impact loads;

Second, the motor's stationary components are all fixedly connected as a whole, which can withstand a certain degree of radial impact load compared to ordinary motors;

3. Without significantly changing the conventional motor structure, the motor structure can be made compact and resistant to high overload shocks by simply designing a step surface with a quantitative height difference in the bearing chamber, selecting large clearance bearings and controlling the axial clearance of the motor.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic cross-sectional view of a motor capable of resisting high overload axial impact loads according to the present invention;

FIG2 is a partial enlarged structural diagram of point A in FIG1;

FIG3 is a partial enlarged structural diagram of an embodiment at B in FIG1 ;

FIG. 4 is a partially enlarged structural diagram of another embodiment of the area B in FIG. 1 .

In the above figure: 1 second bearing; 2 stator assembly; 3 elastic cylindrical pin; 4 outer ring gasket; 5 housing; 501 first bearing chamber; 502 first outer cylindrical surface; 503 first inner cylindrical surface; 6 rotor assembly; 7 inner ring gasket; 8 end cover; 801 second bearing chamber; 802 second outer cylindrical surface; 803 second inner cylindrical surface; 9 solid cylindrical pin; 10 Hall plate assembly; 11 tail cover; 12 screw; 13 spring washer; 14 flat washer; 15 position magnetic steel assembly; 16 first bearing.

The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

DETAILED DESCRIPTION

Example 1

With reference to FIG. 1 and FIG. 2 , an embodiment of the present invention provides a motor capable of resisting high overload axial impact loads, comprising: a housing 5, a stator assembly 2, an end cover 8 and a rotor assembly 6; the housing 5 is a cylindrical structure, one end of the housing 5 is open, and the other end is provided with a first bearing chamber 501, and a first bearing 16 is provided inside the first bearing chamber 501; the stator assembly 2 is provided inside the housing 5, and an elastic cylindrical pin 3 is provided between the stator assembly 2 and the housing 5; the end cover 8 is provided at the open end of the housing 5, and a second bearing chamber 801 is provided inside the end cover 8, and a second outer cylindrical surface 8 is provided at the bottom of the second bearing chamber 801 02 and the second inner circular surface 803, the second outer circular surface 802 and the second inner circular surface 803 form an annular step, the second bearing 1 is arranged on the inner side of the second bearing chamber 801, the outer ring of the second bearing 1 is pressed against the second outer circular surface 802, and the height difference between the second outer circular surface 802 and the second inner circular surface 803 is less than the axial clearance of the second bearing 1; the rotor assembly 6 passes through the interior of the stator assembly 2, and the two ends of the rotor assembly 6 pass through the first bearing 16 and the second bearing 1 respectively, and the shaft shoulder of the rotor assembly 6 is directly or indirectly pressed against the inner ring of the first bearing 16 and the inner ring of the second bearing 1 respectively.

The stator assembly 2 of the motor is fixedly connected to the housing 5 by gluing and elastic cylindrical pins 3, the stator assembly 2 is axially positioned by the inner stop of the housing 5, the end cover 8 is connected to the housing 5 by pins, and the end cover 8 axially presses the end face of the stator assembly 2.

The height difference between the second inner surface 803 and the second outer surface 802 of the second bearing chamber 801 of the end cover 8 is strictly controlled so that the height difference is smaller than the axial clearance of the second bearing 1. By strictly controlling the axial clearance during motor assembly, the rotor assembly 6 can have a certain axial movement.

When the motor is impacted, the rotor assembly 6 can move axially because of the axial clearance of the motor, which prolongs the response time of the impact, that is, when the rotor assembly 6 of the motor moves axially to a certain position, the inner ring of the second bearing 1 begins to be impacted by the rotor assembly 6 and produces axial displacement, and the axial displacement is smaller than the axial clearance of the second bearing 1, but larger than the height difference between the second inner cylindrical surface 803 and the second outer cylindrical surface 802 of the second bearing chamber 801 in the end cover 8, ensuring that the rigid collision between the inner ring of the second bearing 1 and the second inner cylindrical surface 803 of the second bearing chamber 801 removes the impact and transmits the impact force to the fastener position of the housing 5 and the end cover 8, so that the motor can resist high overload axial impact loads. When the impact ends, the rotor assembly 6 of the motor can be returned to its position by electromagnetic attraction and can be powered on to work normally.

Example 2

Referring to FIG. 2 , on the basis of Embodiment 1, an inner ring gasket 7 is provided between the shaft shoulder of the rotor assembly 6 and the inner ring of the second bearing 1 .

The inner ring gasket 7 is arranged between the shaft shoulder of the rotor assembly 6 and the inner ring of the second bearing 1 , and the axial clearance of the entire rotor assembly 6 can be adjusted by adjusting the thickness of the inner ring gasket 7 .

Example 3

Referring to Figure 3, based on Example 1 or Example 2, the bottom of the first bearing chamber 501 is a plane, and an outer ring gasket 4 is provided at the bottom of the first bearing chamber 501. The outer ring of the first bearing 16 is pressed on the outer ring gasket 4, and the thickness of the outer ring gasket 4 is smaller than the axial clearance of the first bearing 16.

The bottom of the first bearing chamber 501 is a plane, and an outer ring gasket 4 is laid at the bottom of the first bearing chamber 501, so that its thickness is less than the axial clearance of the first bearing 16. When the motor is impacted, the rotor assembly 6 can move axially because of the axial clearance of the motor, thereby extending the response time of the impact, that is, when the rotor assembly 6 of the motor moves axially to a certain position, the inner ring of the first bearing 16 begins to be impacted by the rotor assembly 6 and produces axial displacement, which is less than the axial clearance of the first bearing 16 and greater than the height of the outer ring gasket 4, ensuring that the inner ring of the first bearing 16 and the bottom of the first bearing chamber 501 collide rigidly to remove the impact and transmit the impact force to the housing 5, so that the motor can resist high overload axial impact loads. When the impact ends, the rotor assembly 6 of the motor can be returned to its position by electromagnetic attraction and can be powered on to work normally.

Example 4

Referring to Figure 4, based on Example 1 or Example 2, the bottom of the first bearing chamber 501 is provided with a first outer cylindrical surface 502 and a first inner cylindrical surface 503, the outer ring of the first bearing 16 is pressed on the first outer cylindrical surface 502, and the height difference between the first outer cylindrical surface 502 and the first inner cylindrical surface 503 is greater than the axial clearance of the first bearing 16.

When the motor is impacted, the rotor assembly 6 can move axially due to the axial clearance of the motor, thereby extending the response time of the impact, that is, when the rotor assembly 6 of the motor moves axially to a certain position, the inner ring of the first bearing 16 begins to be impacted by the rotor assembly 6 and produces axial displacement, and the axial displacement is smaller than the axial clearance of the first bearing 16, but larger than the height difference between the first outer cylindrical surface 502 and the first inner cylindrical surface 503 of the first bearing chamber 501 in the housing 5, thereby ensuring that the rigid collision between the inner ring of the first bearing 16 and the first inner cylindrical surface 503 of the first bearing chamber 501 removes the impact and transmits the impact force to the housing 5, thereby enabling the motor to resist high overload axial impact loads. When the impact ends, the rotor assembly 6 of the motor can be returned to its position by electromagnetic attraction and can be powered on to work normally.

Example 5

Referring to FIG. 1 , on the basis of Embodiment 1, the end cover 8 is nested in the open end of the shell 1 , and a solid cylindrical pin 9 is provided between the end cover 8 and the side wall of the shell 5 .

The end cover 8 is connected to the housing 5 by a solid cylindrical pin 9, and the side end surface of the end cover 8 is pressed flat against the side end surface of the stator assembly 2. This structural connection method enables the end cover 8 and the housing 5 to form a fixed whole, so that the end cover 8 can withstand the axial overload impact of the rotor assembly 6.

Example 6

Referring to Figure 1, on the basis of Example 1, it also includes a position magnetic steel assembly 15 and a Hall plate assembly 10, wherein the Hall plate assembly 10 is arranged on the outside of the end cover 8, and the position magnetic steel assembly 15 is assembled at one end of the rotating shaft of the rotor assembly 6 passing through the end cover 8.

The position magnetic steel assembly 15 is axially connected and fixedly connected to the rotor assembly 6 of the motor by gluing and screwing to form a rotatable whole. It can rotate coaxially relative to the static whole formed by the housing 5, the end cover 8 and the stator assembly 2 through the first bearing 16 and the second bearing 1. When subjected to high overload axial impact loads, only the end cover 8 needs to bear the impact, and other components are not affected.

Example 7

Referring to Figure 1, on the basis of Example 6, a countersunk hole is provided in the middle of the position magnetic steel assembly 15, and the countersunk hole cooperates with the end of the rotating shaft of the rotor assembly 6, and is connected to the end of the rotating shaft of the rotor assembly 6 through screws 12, spring washers 13 and flat washers 14.

The position magnetic steel assembly 15 is buckled onto the end of the rotating shaft of the rotor assembly 6 through the countersunk hole in the middle thereof. The screw 12 passes through the washer 13 and the flat washer 14 and then passes through the position magnetic steel assembly 15 and the end of the rotating shaft of the rotor assembly 6 to fix the position magnetic steel assembly 15 and the rotor assembly 6 together. When the motor is subjected to a high overload axial impact load, only the rotor assembly 6, the first bearing 16 and the second bearing 1 need to bear the impact, and other components will not be affected.

Example 8

With reference to FIG1 , on the basis of Embodiment 6 or Embodiment 7, a tail cover 11 is further included, and the tail cover 11 is connected to the end cover 8 by passing through the Hall plate assembly 10 via an axial screw.

The tail cover 11 is connected to the end cover 8 through the Hall plate assembly 10 by screws 12. This structural design allows all the stationary components on the motor, including the housing 5, stator assembly 2, end cover 8, tail cover 11, and Hall plate assembly 10, to be axially connected and fixed as a whole. When subjected to high overload axial impact loads, only the end cover 8 needs to bear the impact, and other components are not affected.

The above are only preferred specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The components and structures not described in detail in this embodiment are well-known components and common structures or common means in the industry, and are not described here one by one.

Claims (6)

1. An electric motor capable of withstanding high overload axial impact loads, comprising:

The shell (5), the shell (5) is of a cylindrical structure, one end of the shell (5) is opened, a first bearing chamber (501) is arranged at the other end of the shell, and a first bearing (16) is arranged at the inner side of the first bearing chamber (501);

The stator assembly (2), the stator assembly (2) is arranged on the inner side of the shell (5), and an elastic cylindrical pin (3) is arranged between the stator assembly (2) and the shell (5);

The end cover (8), the end cover (8) is arranged at the opening end of the shell (5), a second bearing chamber (801) is arranged at the inner side of the end cover (8), a second outer circular surface (802) and a second inner circular surface (803) are arranged at the bottom of the second bearing chamber (801), the second outer circular surface (802) and the second inner circular surface (803) form an annular step, a second bearing (1) is arranged at the inner side of the second bearing chamber (801), the outer ring of the second bearing (1) is propped against the second outer circular surface (802), and the difference in height between the second outer circular surface (802) and the second inner circular surface (803) is smaller than the axial play of the second bearing (1);

A rotor assembly (6), wherein the rotor assembly (6) passes through the interior of the stator assembly (2), two ends of the rotor assembly (6) respectively pass through the first bearing (16) and the second bearing (1), and the shaft shoulders of the rotor assembly (6) directly or indirectly respectively prop against the inner ring of the first bearing (16) and the inner ring of the second bearing (1);

The bottom of the first bearing chamber (501) is provided with a first outer circular surface (502) and a first inner circular surface (503), the first outer circular surface (502) and the first inner circular surface (503) form an annular step, the outer ring of the first bearing (16) is propped against the first outer circular surface (502), and the height difference between the first outer circular surface (502) and the first inner circular surface (503) is smaller than the axial clearance of the first bearing (16);

the end cover (8) is nested in the opening end of the shell (5), and a solid cylindrical pin (9) is arranged between the end cover (8) and the side wall of the shell (5).

2. The electric machine capable of withstanding high axial impact loads according to claim 1, characterized in that an inner ring gasket (7) is arranged between the shoulder of the rotor assembly (6) and the inner ring of the second bearing (1).

3. The motor capable of resisting high overload axial impact load according to claim 1 or 2, wherein the bottom of the first bearing chamber (501) is a plane, an outer ring gasket (4) is arranged at the bottom of the first bearing chamber (501), an outer ring of the first bearing (16) is propped against the outer ring gasket (4), and the thickness of the outer ring gasket (4) is smaller than the axial play of the first bearing (16).

4. The motor of claim 1, further comprising a positional magnet assembly (15) and a hall plate assembly (10), the hall plate assembly (10) being disposed outside the end cap (8), the positional magnet assembly (15) being mounted at one end of the rotor assembly (6) that passes through the axis of rotation of the end cap (8).

5. The motor capable of resisting high overload axial impact load according to claim 4, wherein a counter bore is arranged in the middle of the position magnetic steel assembly (15), is matched with the end part of the rotating shaft of the rotor assembly (6), and is connected with the end part of the rotating shaft of the rotor assembly (6) through a screw (12), a spring pad (13) and a flat pad (14).

6. The motor of claim 4 or 5, further comprising a tail cap (11), wherein the tail cap (11) is connected to the end cap (8) by axial screws passing through the hall plate assembly (10).