Motor structure and electrical equipment

Abstract

The present invention provides a motor structure, i.e., an electrical device, which includes a bearing sleeved outside a rotor, wherein a pressure medium is sealed between the bearing and the rotor, and the pressure medium can form a medium film at the gap between the rotor and the bearing to support the rotation of the rotor. Seals are also installed at both ends of the bearing, and the seals are annular structures. Both ends of the bearing have protrusions, and the protrusions can engage with the seals to form a sealed connection between the bearing and the seals. The annular holes of the annular structure match the size of the rotor. Based on the technical solution of the present invention, the axial length of the motor is reduced, the pressure on the rotor surface is increased, and part of the centrifugal force of the rotor can be offset to increase the maximum speed of the rotor. At the same time, the rotor of the motor is indirectly cooled, further improving the stability of the motor operation.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and in particular to a motor structure and electrical equipment. Background Art

[0002] Electric motors have become the primary source of power output due to their low cost, simple structure, high efficiency, and environmental friendliness. However, for permanent magnet motors, operational stability, rotor reliability, and compactness have always been design requirements that cannot be simultaneously met.

[0003] To ensure the stability of the motor, some current motors use conical gas-lubricated bearings at the front and rear ends to achieve complete isolation between the motor stator and rotor. However, this not only requires placing a bearing at each end of the rotor, resulting in a large axial length of the motor, but also the airflow facing the bearings only serves as a support, making them less useful. At the same time, it is noisy and the internal operating temperature of the motor is high. Summary of the Invention

[0004] In response to the above-mentioned problems in the prior art, the present application proposes a motor structure and electrical equipment, which can not only solve the support and heat dissipation problems of the motor rotor, but also reduce the operating temperature rise of the permanent magnet, thereby increasing the stability of the motor operation.

[0005] A motor structure of the present invention includes a bearing sleeved outside a rotor, wherein a pressure medium is sealed between the bearing and the rotor, and the pressure medium can form a medium film at the gap between the rotor and the bearing to support the rotation of the rotor.

[0006] In one embodiment, it also includes a seal installed at both ends of the bearing, the seal is a circular ring structure, and both ends of the bearing have a raised portion, the raised portion can engage with the seal to form a sealed connection between the bearing and the seal, and the circular ring hole of the circular ring structure matches the size of the rotor; through this embodiment, the seals arranged at both ends of the bearing are used to seal the pressure medium between the bearing and the rotor, and at the same time, the circular ring structure of the seal passes through the rotor, which ensures that when the rotor runs smoothly, speeds up, slows down, starts and stops, the pressure medium will not leak or seep from the contact surface between the bearing and the seal and the tiny gap between the seal and the rotor, so as to avoid affecting the operation of the rotor.

[0007] In one embodiment, a medium port structure is provided at both ends of the bearing, and the medium port structure includes an inlet and an outlet constituting a circulation circuit of the pressure medium; through this embodiment, the pressure medium between the bearing and the rotor is facilitated to flow in and out of the circulation circuit, so as to be replenished when the pressure medium leaks.

[0008] In one embodiment, the connecting straight line between the inlet and the outlet of the medium port structure passes through the center line of the rotor; through this embodiment, the pressure medium enters from one end of the bearing, passes through the rotor, and then flows out from the other end of the bearing, so that the pressure medium can flow fully in the bearing.

[0009] In one embodiment, the medium port structures at both ends of the bearing are symmetrical about the cross-section where the center of the bearing is located, and the cross-section is a plane perpendicular to the bearing axis; through this embodiment, the pressure medium in the bearing can evenly support the rotor, avoiding the rotor from being offset due to different support pressures at both ends.

[0010] In one embodiment, the circulation circuit is also connected to an external boosting component, which can pressurize the pressure medium. Through this embodiment, the pressure medium is pressurized by the external boosting component to ensure the support of the pressure medium on the rotor. At the same time, the pressure medium increases the pressure on the rotor surface, further offsetting part of the centrifugal force of the rotor to increase the maximum speed of the rotor, which is suitable for high-power and high-speed motors.

[0011] In one embodiment, the circulation circuit is also connected to an external cooling component, which can cool the pressure medium; through this embodiment, due to the movement or loss of the rotor during operation, the rotor will increase the temperature of the pressure medium, and the cooling component arranged on the circulation circuit can cool the pressure medium. At the same time, since the pressure medium is in direct contact with the rotor, the cooling component can also indirectly cool the rotor of the motor, further improving the stability of the motor operation.

[0012] In one embodiment, the pressure medium is a liquid that is heat-conducting and chemically stable.

[0013] In one embodiment, the pressure medium is a gas that is heat-conducting and chemically stable.

[0014] The present invention also provides an electrical device, comprising the motor structure described above.

[0015] The above technical features can be combined in various suitable ways or replaced by equivalent technical features, as long as the purpose of the present invention can be achieved.

[0016] The motor structure and electrical equipment provided by the present invention have at least the following beneficial effects compared with the prior art:

[0017] (1) The bearing is installed between the stator and the rotor, and the pressure medium is sealed between the bearing and the rotor, so that the pressure medium directly contacts and supports the rotor, thereby reducing the axial length of the motor.

[0018] (2) The booster assembly connected to the pressure medium can pressurize the pressure medium and then inject it into the bearing through the circulation circuit, so that the pressure medium increases the pressure on the rotor surface, further offsetting part of the centrifugal force of the rotor to increase the maximum speed of the rotor. It is suitable for high-power and high-speed motors.

[0019] (3) The cooling component connected to the pressure medium can cool the pressure medium, so that the temperature of the pressure medium between the bearing and the rotor remains stable, and at the same time indirectly cools the rotor of the motor, further improving the stability of the motor operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be described in more detail below based on embodiments and with reference to the accompanying drawings, wherein:

[0021] Figure 1 A schematic diagram showing the structure of the motor structure of the present invention in one direction;

[0022] Figure 2 A schematic structural diagram showing the motor structure of the present invention is shown;

[0023] Figure 3 A schematic structural diagram showing a sealing member of a motor structure of the present invention;

[0024] Figure 4 A schematic structural diagram showing a bearing of the motor structure of the present invention;

[0025] In the drawings, like reference numerals are used for like parts, but the drawings are not necessarily true to scale.

[0026] Reference numerals:

[0027] 1- stator, 2- bearing, 3- seal, 4- rotor, 5- inlet, 6- outlet. DETAILED DESCRIPTION

[0028] The present invention will be further described below with reference to the accompanying drawings.

[0029] The present invention provides a motor structure, such as Figure 1 and Figure 2As shown, it includes a bearing 2 sleeved on the outside of the rotor 4, and a pressure medium is sealed between the bearing 2 and the rotor 4. The pressure medium can form a medium film at the gap between the rotor 4 and the bearing 2 to support the rotation of the rotor 4, that is, the pressure medium is used to reduce the centrifugal force of the rotor 4 during operation, thereby ensuring the stability of the rotor 4. At the same time, the bearing 2 is directly sleeved on the outside of the rotor 4, which not only reduces the axial size of the motor, but also can directly support the rotor 4 along the radial direction of the rotor 4 through the pressure medium. Compared with supporting the rotor 4 on both sides of the rotor 4, it can reduce the centrifugal force of the rotor 4 when the rotor 4 rotates at high speed and improve the stability of the rotor 4.

[0030] In one embodiment, the thickness of the bearing 2 is set according to the gap between the rotor 4 and the stator 1; for example, when the gap between the rotor 4 and the stator 1 is 2 mm, the thickness of the bearing 2 is 1 mm;

[0031] It should be noted that the bearing 2 is made of high-strength material and its thickness can be less than 1 mm. The pressure medium forms a dielectric film in the gap between the inner wall of the rotor 4 and the bearing 2. The size of the gap between the rotor 4 and the stator 1 minus the thickness of the bearing 2 is the size of the gap where the dielectric film is formed. Since the length of the dielectric film matches the length of the rotor 4, the pressure medium has a large support area for the rotor 4, that is, the thickness of the dielectric film formed by the pressure medium does not need to be too large to make the rotor 4 suspended; in other words, there is no need for conventional ball bearings to support the rotor 4, and the pressure of the pressure medium can be used to support the rotor 4 and make the rotor 4 suspended.

[0032] Furthermore, the bearing 2 is made of non-magnetic material to avoid affecting the performance of the motor, that is, it does not affect the magnetic field distribution of the motor, so that the power factor of the excitation current does not change.

[0033] In one embodiment, Figure 3 As shown, the motor structure also includes a seal 3 installed at both ends of the bearing 2. The seal 3 is a hollow annular structure. The two ends of the bearing also have a protrusion, which can engage with the outer edge of the seal 3 to form a sealed connection between the bearing 2 and the seal 3. The annular hole of the annular structure matches the size of the rotor 4, and the seal 3 forms a dynamic seal with the rotor 4, that is, the seal 3 provided at both ends of the bearing 2 is used to seal the pressure medium between the bearing 2 and the rotor 4, so that the medium film formed by the pressure medium supports the rotor 4. Even if the rotor 4 is suspended, the annular structure of the seal 3 passes through the rotor 4, and the seal 3 maintains a dynamic seal with the rotor 4, that is, when the rotor 4 runs smoothly, speeds up, speeds down, starts and stops, the pressure medium will not leak or seep from the contact surface between the bearing 2 and the seal 3 and the tiny gap between the seal 3 and the rotor 4, thereby avoiding affecting the operation of the rotor 4.

[0034] In one embodiment, Figure 1 and Figure 4 As shown, both ends of the bearing 2 are provided with a medium port structure, which includes an inlet 5 and an outlet 6 constituting a circulation circuit of the pressure medium, so as to facilitate the flow of the pressure medium between the bearing 2 and the rotor 4 in and out of the circulation circuit, so as to replenish the pressure medium when it leaks.

[0035] It should be noted that in order to better control the pressure medium in the bearing 2, a circulation circuit is established that can not only extract the pressure medium when needed, but also quickly replenish the pressure medium when it leaks. The through hole is located on the part of the bearing wall of the bearing 2 protruding from the stator 1, which is convenient for connecting with the through hole on the bearing 2 through a pipeline to establish a circulation circuit.

[0036] In one embodiment, the connecting straight line between the inlet 5 and the outlet 6 of the medium port structure passes through the center line of the rotor 4, so that the pressure medium enters from one end of the bearing 2, passes through the rotor 4, and then flows out from the other end of the bearing 2, so that the pressure medium can flow fully in the bearing.

[0037] Furthermore, the medium port structures at both ends of the bearing 2 are symmetrical about the cross-section where the center of the bearing 2 is located, that is, the distances between the medium ports at both ends of the bearing 2 and the bearing 2 are the same, so that the pressure medium filled at both ends of the bearing 2 can evenly support the rotor, thereby avoiding the rotor 4 from being offset due to different support pressures at both ends.

[0038] It should be noted that the cross section is a plane extending from the midpoint of the center line of the bearing 2 in the axial direction to the radial direction of the bearing 2 .

[0039] In one embodiment, the circulation circuit is also connected to a booster assembly for pressurizing the pressure medium. The inlet 5 is set at the bottom position of the bearing 2 when in use, and the outlet 6 is set at the top position of the bearing 2 when in use. The pressure medium is pressurized by the provided booster assembly to ensure that the pressure medium entering through the inlet 5 supports the rotor 4. At the same time, the pressure medium increases the pressure on the surface of the rotor 4, further offsetting part of the centrifugal force of the rotor 4 when rotating at high speed, so as to increase the maximum speed of the rotor 4.

[0040] In one embodiment, the circulation circuit is also connected to a cooling component for cooling the pressure medium. Due to the movement or loss of the rotor 4 during operation, the rotor 4 will increase the temperature of the pressure medium. The pressure medium is cooled by the cooling component arranged on the circulation circuit. At the same time, since the pressure medium is in direct contact with the rotor 4, the cooling component can also indirectly cool the rotor 4 of the motor, further improving the stability of the motor operation.

[0041] In one embodiment, the pressure medium is a liquid that is heat-conducting and chemically stable, that is, the pressure medium can quickly take away the heat of the rotor 4 without reacting with the rotor 4, the bearing 2, and the seal 3, thereby avoiding damaging the structure of the motor. For example, if oil is used as the pressure medium, it can both support the rotor 4 and dissipate heat from the rotor 4.

[0042] In one embodiment, the pressure medium is a gas that is heat-conducting and chemically stable, that is, the pressure medium can quickly take away the heat of the rotor 4 without reacting with the rotor 4, bearing 2 and seal 3, thereby avoiding damaging the structure of the motor, such as using air as the pressure medium.

[0043] In one embodiment, the motor structure can be applied to motors such as disc motors, brushless DC motors, surface-mounted permanent magnet synchronous motors, embedded permanent magnet synchronous motors, and asynchronous motors, and can also be applied to generators, with high stability during high-speed rotation.

[0044] In one embodiment, there are multiple symmetrical cavities between the sealing structure composed of the bearing 2 and the seal 3 and the rotor 4, and the inlet 5 and outlet 6 on the bearing 2 correspond to the positions of the cavities respectively, so that the pressure medium has a buffer cavity when entering or flowing out of the sealing structure, which facilitates the circulation of the pressure medium in the sealing structure.

[0045] The present invention also provides an electrical device, comprising the above motor structure.

[0046] In the description of the present invention, it should be understood that the terms "upper", "lower", "bottom", "top", "front", "back", "inside", "outside", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0047] Although the present invention is described herein with reference to specific embodiments, it should be understood that these embodiments are merely illustrative of the principles and applications of the invention. It should be understood that many modifications may be made to the illustrative embodiments, and that other arrangements may be devised, without departing from the spirit and scope of the invention as defined by the appended claims. It should be understood that the various dependent claims and features described herein may be combined in ways other than those described in the original claims. It should also be understood that features described in conjunction with individual embodiments may be employed in conjunction with other described embodiments.

Claims

1. A motor structure, characterized in that: The invention comprises a bearing sleeved on the outside of the rotor, wherein a pressure medium is sealed between the bearing and the rotor, and the pressure medium can form a medium film at the gap between the rotor and the bearing to support the rotation of the rotor; Both ends of the bearing are provided with a medium port structure, the medium port structure including an inlet and an outlet constituting a circulation circuit of the pressure medium, the inlet being arranged at the bottom position of the bearing in use, and the outlet being arranged at the top position of the bearing in use; The connecting straight line between the inlet and the outlet of the medium port structure passes through the center line of the rotor; The inlet and the outlet of the circulation circuit are located on the part of the bearing wall protruding from the stator.

2. The motor structure according to claim 1, characterized in that: It also includes seals installed at both ends of the bearing. The seals are annular structures. Both ends of the bearing have raised portions. The raised portions can engage with the seals to form a sealed connection between the bearing and the seals. The annular hole of the annular structure matches the size of the rotor.

3. The motor structure according to claim 1, characterized in that: The media port structures at both ends of the bearing are symmetrical about a cross section where the center of the bearing is located, and the cross section is a plane perpendicular to the bearing axis.

4. The motor structure according to claim 1, characterized in that: The circulation circuit is further connected to an external pressurizing component, and the pressurizing component is capable of pressurizing the pressure medium.

5. The motor structure according to claim 1 or 4, characterized in that: The circulation circuit is further connected to an external cooling component, and the cooling component can cool the pressure medium.

6. The motor structure according to claim 1, characterized in that: The pressure medium is a liquid that is heat-conducting and chemically stable.

7. The motor structure according to claim 1, characterized in that: The pressure medium is a gas that is heat-conducting and chemically stable.

8. An electrical device, characterized in that: The motor structure comprises the motor structure according to any one of claims 1 to 7.

Images