Axial magnetic bearings, motors, air conditioners

Abstract

The present invention provides an axial magnetic bearing, a motor, and an air conditioner, wherein the axial magnetic bearing comprises two axial cores arranged at a relative interval, a magnetic tube forming an air gap with the axial cores is provided in the axial gap between the two axial cores, the axial cores comprise a base plate and a boss arranged along the axial direction thereof, the magnetic tube is sleeved on the circumferential outer side of the boss and forms a coil winding groove with an opening toward the thrust disk side of the rotor with the outer peripheral wall of the boss. According to the present invention, the coil winding groove constructed on the axial core has an open surface toward the radial outer peripheral side thereof, so that the coil winding groove can be processed by a simpler processing method such as turning, thereby improving the production efficiency of the axial magnetic bearing.

Description

Technical Field

[0001] The invention belongs to the technical field of motor manufacturing, and in particular relates to an axial magnetic suspension bearing, a motor and an air conditioner. Background Art

[0002] Figure 1 A currently commonly used active magnetic bearing is shown, including two axial cores arranged opposite to each other, with U-shaped grooves constructed on the axial cores for embedding control coils, an insulating frame is provided between the control coils and the U-shaped grooves, and the thrust plate of the rotor is located between the two axial cores. By controlling the on-off and size of the current in the two control coils, magnetic suspension control of the axial displacement of the rotor is achieved. The structure is relatively simple. For the aforementioned U-shaped grooves, due to the limitations of the processing technology, milling is generally used, but the milling efficiency is lower than the turning efficiency, which restricts the production efficiency of the magnetic bearing. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide an axial magnetic bearing, a motor, and an air conditioner, wherein the coil winding groove constructed on the axial iron core has an open surface facing its radial outer peripheral side, so that the coil winding groove can be processed by a simpler processing method such as turning, thereby improving the production efficiency of the axial magnetic bearing.

[0004] In order to solve the above problems, the present invention provides an axial magnetic levitation bearing, comprising two axial iron cores arranged relatively at an interval, a magnetic conductive cylinder forming an air gap between the two axial iron cores is provided in the axial gap between the two axial iron cores, the axial iron core comprises a base plate and a boss arranged along its axial direction, the magnetic conductive cylinder is sleeved on the circumferential outer side of the boss and forms a coil winding groove with the outer circumferential wall of the boss, the coil winding groove opening toward the thrust plate side of the rotor.

[0005] Preferably, the magnetic conductive cylinder is connected to the thrust plate.

[0006] Preferably, in the axial direction of the axial core, the protruding column is in a truncated cone structure, and the small-diameter bottom surface of the truncated cone structure is located on the substrate.

[0007] Preferably, an insulating frame is provided in the coil winding groove, and the insulating frame includes a first side wire retaining ring and a second side wire retaining ring which are relatively spaced apart, and the first side wire retaining ring and the second side wire retaining ring are connected as a whole through a winding drum, and the winding drum is matched in shape and mounted on the circumferential outer side of the boss.

[0008] Preferably, the insulating frame is formed on the convex column by injection molding.

[0009] Preferably, the insulating frame is formed by assembling a plurality of frame sub-bodies.

[0010] Preferably, any two adjacent skeleton sub-bodies are connected via snap fasteners.

[0011] Preferably, the rotor comprises a rotating shaft, and the thrust plate is integrally formed with the rotating shaft; and / or the magnetic conductive cylinder is mounted on the outer peripheral wall of the thrust plate by interference fitting, adhesive bonding, welding, and screw connection.

[0012] The present invention also provides a motor, comprising the above-mentioned axial magnetic suspension bearing.

[0013] The present invention also provides an air conditioner, comprising the above-mentioned motor.

[0014] The present invention provides an axial magnetic bearing, a motor, and an air conditioner, wherein the coil winding groove is formed by the base plate, the boss, and the magnetic tube. Since there is an air gap between the magnetic tube and the axial iron core, that is, there is no contact between the two and it is only a structural positional relationship. Therefore, objectively, the coil winding groove has an open surface facing the radial outer peripheral side of the axial iron core. This open groove structure enables the coil winding groove to be processed by a simpler processing method such as turning, thereby improving the production efficiency of the axial magnetic bearing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of an active axial magnetic suspension bearing in the prior art;

[0016] Figure 2 A schematic structural diagram of an axial magnetic bearing according to an embodiment of the present invention;

[0017] Figure 3 for Figure 2 The magnetic circuit diagram of the axial magnetic suspension bearing in operation is shown in FIG. 1 . When the magnetic force of the control coil in the left axial core is greater than the magnetic force of the control coil in the right axial core, the rotating shaft can be moved and adjusted toward the left; when the magnetic force of the control coil in the right axial core is greater than the magnetic force of the control coil in the left axial core, the rotating shaft can be moved and adjusted toward the right;

[0018] Figure 4 for Figure 2 Schematic diagram of the disassembled structure (partial section view);

[0019] Figure 5 for Figure 1 A schematic diagram of a connection structure between the magnetic tube and the rotor;

[0020] Figure 6 for Figure 1 Another connection structure between the magnetic tube and the rotor is shown in FIG.

[0021] Figure 7 for Figure 1 A schematic diagram of another connection structure between the magnetic conductive cylinder and the rotor, wherein the magnetic conductive cylinder is formed by assembling two monomers;

[0022] Figure 8 for Figure 1 A schematic diagram of the three-dimensional structure of the insulating skeleton;

[0023] Fig. 9 for Figure 8 A partial enlarged view of point A in the middle.

[0024] The reference numerals are:

[0025] 1. Axial iron core; 11. Base plate; 12. Boss; 13. Coil winding slot; 2. Rotor; 21. Thrust plate; 22. Rotating shaft; 3. Magnetic cylinder; 4. Insulating frame; 41. First side wire retaining ring; 42. Second side wire retaining ring; 43. Winding drum; 44. Frame sub-body; 5. Control coil. DETAILED DESCRIPTION

[0026] See also Figures 1 to 9 As shown, according to an embodiment of the present invention, an axial magnetic bearing is provided, comprising two axial cores 1 arranged relatively at intervals, a magnetic tube 3 forming an air gap with the axial cores 1 is provided in the axial gap between the two axial cores 1, the axial core 1 comprises a base plate 11 and a boss 12 arranged along its axial direction, the magnetic tube 3 is sleeved on the circumferential outer side of the boss 12 and forms a coil winding groove 13 with the outer peripheral wall of the boss 12, the coil winding groove 13 opening toward the thrust disk 21 of the rotor 2, it can be understood that an insulating skeleton 4 is first embedded in the coil winding groove 13, the insulating skeleton 4 is sleeved on the outer peripheral side wall of the boss 12, and a control coil 5 is wound on the insulating skeleton 4 to individually control the magnetism of the two axial cores 1, for example, to adjust the current size or even direction in the control coil 5. In this technical solution, the coil winding groove 13 is formed by the base plate 11, the boss 12 and the magnetic tube 3. Since there is an air gap between the magnetic tube 3 and the axial core 1, that is, there is no contact between the two and it is only a structural positional relationship. Therefore, objectively, the coil winding groove 13 has an open surface facing the radial outer peripheral side of the axial core. This open groove structure enables the coil winding groove to be processed by a simpler processing method such as turning, thereby improving the production efficiency of the axial magnetic levitation bearing.

[0027] The specific positioning of the magnetic tube 3 can be varied. For example, it can be separately assembled into the bearing housing. Preferably, the magnetic tube 3 is connected to the thrust plate 21 as a whole. Specifically, for example, the magnetic tube 3 can be fitted on the outer wall of the thrust plate 21 by interference fitting, adhesive bonding, welding, or screw connection. It can also be formed by integral molding with the thrust plate 21. Figure 7 As shown, the magnetic conductive cylinder 3 can also be formed by assembling two monomers.

[0028] Furthermore, in the axial direction of the axial core 1, the boss 12 is in a frustum of a cone structure, and the small diameter bottom surface of the frustum of a cone structure is on the substrate 11. At this time, the boss 12 of the frustum of a cone structure can effectively prevent the insulating frame 4 and the control coil 5 mounted on its outer peripheral side from falling off. In the prior art, the assembly consisting of the insulating frame and the control coil is fixed on the axial core when in use. If the fixation is not firm, the axial magnetic suspension bearing may cause the assembly consisting of the insulating frame and the control coil to fall off the axial core during transportation and normal use. The residues of the insulating frame may cause abnormal operating clearance of the entire machine, resulting in damage to the machine, or the control coil may be worn, resulting in short-circuit failure of the axial magnetic suspension bearing.

[0029] The insulating frame 4 includes a first side wire retaining ring 41 and a second side wire retaining ring 42 which are relatively spaced apart. The first side wire retaining ring 41 and the second side wire retaining ring 42 are connected as a whole via a winding drum 43. The winding drum 43 is matched in shape and is fitted on the circumferential outer side of the boss 12, that is, the shape of the winding drum 43 is also a truncated cone.

[0030] The insulating frame 4 is formed on the boss 12 by injection molding to facilitate the installation of the insulating frame 4, but this method has some disadvantages in terms of maintenance convenience. Figure 8 and 9 As shown, the insulating skeleton 4 is formed by assembling a plurality of skeleton sub-bodies 44 to meet the installation requirements of the truncated cone-shaped boss 12. The skeleton sub-bodies 44 can be two or more. It is understandable that the more the number of the skeleton sub-bodies 44, the more difficult it will be in the initial stage of winding the control coil 5. Preferably, any two adjacent skeleton sub-bodies 44 are connected by snap-fits to form a preliminary connection and positioning between the skeleton sub-bodies 44, thereby facilitating the winding process of the control coil 5.

[0031] It can be understood that the rotor 2 includes a rotating shaft 22 and the thrust plate 21 thereon. The thrust plate 21 can be integrally formed with the rotating shaft 22, or a detachable connection can be formed by interference fitting, adhesive bonding, welding, or screw connection. It can be further understood that the specific method adopted should be adapted to the specific connection method between the magnetic tube 3 and the thrust plate 21.

[0032] The axial magnetic bearing can be assembled in the following manner:

[0033] During pre-assembly, first assemble the two axial cores 1 with the corresponding insulating skeletons 4 and control coils 5 to form a front axial stator assembly and a rear axial stator assembly respectively, and assemble the rotating shaft 22 with the thrust plate 21 and the magnetic tube 3 to form a rotor assembly.

[0034] During the overall assembly, first fix the front axial stator assembly to the external housing or bracket, and then press the rotor assembly Figure 3 Pass through the inner hole of the axial core from left to right, and then install the rear axial stator assembly structure on the right side of the whole.

[0035] The working principle of axial bearings is as follows Figure 3 When the rotor assembly needs to move forward, the control coil 5 in the front axial stator assembly is energized, and the control coil 5 in the rear axial stator assembly is not energized. The magnetic circuit in the bearing only has a double-arrow magnetic circuit on the left, and no single-arrow magnetic circuit on the right. Therefore, the left front axial stator assembly will produce a leftward gravitational force on the rotor assembly, so the rotor assembly will deviate to the left. Similarly, when the rotor assembly needs to move to the right, the control coil 5 in the rear axial stator assembly is energized, and the control coil 5 in the front axial stator assembly is not energized. The magnetic circuit in the bearing only has a single-arrow magnetic circuit on the right, and no double-arrow magnetic circuit on the left. Therefore, the right rear axial core assembly will produce a rightward gravitational force on the rotor assembly, so the rotor assembly will deviate to the right.

[0036] According to the working principle of the bearing, the axial iron core 11, the conducting tube 3, the thrust plate 21 and the rotating shaft 22 need to be made of magnetic conductive materials, otherwise the axial bearing function cannot be realized.

[0037] According to an embodiment of the present invention, there is further provided a motor, comprising the above-mentioned axial magnetic bearing.

[0038] According to an embodiment of the present invention, there is also provided an air conditioner, comprising the above-mentioned motor.

[0039] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0040] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention, and these improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An axial magnetic bearing, characterized in that: It comprises two axial cores (1) arranged at a relative interval, a magnetic tube (3) forming an air gap with the axial cores (1) is provided in the axial gap between the two axial cores (1), the axial core (1) comprises a base plate (11) and a boss (12) arranged along its axial direction, the magnetic tube (3) is sleeved on the circumferential outer side of the boss (12) and forms a coil winding groove (13) with the outer peripheral wall of the boss (12) and opening toward the side of the thrust disk (21) of the rotor (2), and the air gap is located at the two end surfaces of the magnetic tube (3).

2. The axial magnetic bearing according to claim 1, characterized in that: The magnetic conductive cylinder (3) is connected to the thrust plate (21).

3. The axial magnetic bearing according to claim 1, characterized in that: In the axial direction of the axial iron core (1), the protruding column (12) is in a truncated cone structure, and the small-diameter bottom surface of the truncated cone structure is located on the base plate (11).

4. The axial magnetic bearing according to claim 3, characterized in that: An insulating frame (4) is provided in the coil winding groove (13), the insulating frame (4) comprising a first side wire retaining ring (41) and a second side wire retaining ring (42) which are arranged at a relative interval, the first side wire retaining ring (41) and the second side wire retaining ring (42) being connected as a whole via a winding drum (43), the winding drum (43) being fitted on the circumferential outer side of the protruding column (12) in a shape-matched manner.

5. The axial magnetic bearing according to claim 4, characterized in that: The insulating frame (4) is formed on the convex column (12) by injection molding.

6. The axial magnetic bearing according to claim 4, characterized in that: The insulating frame (4) is formed by assembling a plurality of frame sub-bodies (44).

7. The axial magnetic bearing according to claim 6, characterized in that: Any two adjacent skeleton sub-bodies (44) are connected via snap fasteners.

8. The axial magnetic bearing according to claim 1, characterized in that: The rotor (2) comprises a rotating shaft (22), and the thrust plate (21) and the rotating shaft (22) are integrally formed; and / or the magnetic conductive cylinder (3) is sleeved on the outer peripheral wall of the thrust plate (21) by means of interference fitting, adhesive bonding, welding, or screw connection.

9. A motor comprising an axial magnetic bearing, characterized in that: The axial magnetic bearing is the axial magnetic bearing according to any one of claims 1 to 8.

10. An air conditioner, comprising a motor, characterized in that: The motor is the motor according to claim 9.

Images