Rotor structure and electric machine having the same

Abstract

The application provides a rotor structure and a motor with the same. The rotor structure comprises a rotor body and a balancing structure. The rotor body comprises a core assembly and a rotating shaft. The rotating shaft is connected with the core assembly. In the axial direction of the rotor structure, the balancing structure has a distance from the core assembly. The balancing structure can balance and correct the rotor body. According to the rotor structure, dynamic balance adjustment can be performed while the rotor structure is protected.

Description

Technical Field

[0001] The present application belongs to the field of motor technology, and specifically relates to a rotor structure and a motor having the same. Background Art

[0002] The rotor structure of existing high-speed motors primarily consists of four components: the optical axis, front and rear rotor baffles, the core assembly, and a precision nut. To prevent high vibration, high noise, and severe bearing wear caused by rotor imbalance, high-speed motors require a much higher level of dynamic balancing than conventional low-speed motors. The higher the dynamic balancing level, the smaller the allowable unilateral rotor imbalance and the greater the required weight removal or addition. The method employed in related art involves removing or adding weight to the front and rear rotor baffles.

[0003] However, the deweighting method in the related art is to directly grind the rotor baffle with an angle grinder during calibration, but the scope of application of this method is very limited. Grinding the rotor baffle will be very serious. It will not only damage the rotor punching and bring safety hazards, but in some cases, the rotor baffle may not meet the deweighting quality requirements required for the initial imbalance, causing the rotor dynamic balance check to fail and making it unable to meet the quality requirements of the whole machine assembly. The weighting method in the related art is to correct the dynamic balance. This method is to pre-process the dynamic balance hole on the rotor baffle, and then add copper columns or copper screws into it when needed, and use this weighting method to perform dynamic balance verification. However, in order to prevent the counterweight copper column or copper screw from being thrown out at high speed, the counterweight block is usually spot welded on the rotor baffle. Not only does it bring high thermal stress to the rotor baffle, but the excessively high temperature can also easily cause the magnet near the baffle to undergo irreversible demagnetization, thereby seriously affecting the overall performance of the motor.

[0004] Therefore, how to provide a rotor structure that can perform dynamic balancing adjustment while protecting the rotor structure and a motor having the same has become an urgent problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] Therefore, the technical problem to be solved by the present application is to provide a rotor structure and a motor having the same, which can perform dynamic balancing adjustment while protecting the rotor structure.

[0006] In order to solve the above problems, the present application provides a rotor structure, comprising:

[0007] The rotor body includes an iron core assembly and a rotating shaft, and the rotating shaft is connected to the iron core assembly;

[0008] The balancing structure has a distance from the core assembly in the axial direction of the rotor structure, and the balancing structure can perform balance correction on the rotor body.

[0009] Further, the iron core assembly comprises an iron core body and a rotor baffle, and the rotor baffle is arranged at an axial end of the iron core body.

[0010] Further, a balance structure is arranged on the rotating shaft, and the balance structure is movable in the circumferential direction of the rotating shaft.

[0011] Further, the rotor structure further comprises a limiting structure, the limiting structure is arranged on the rotating shaft, and the balance structure is movably arranged on the limiting structure, so that the balance structure is movable in the circumferential direction of the rotating shaft.

[0012] Further, the limiting structure comprises a limiting ring, the limiting ring is sleeved on the rotating shaft, and the limiting ring is in interference fit with the rotating shaft.

[0013] Further, the limiting structure is provided with a first concave-convex structure, the balance structure is provided with a second concave-convex structure, and the first concave-convex structure and the second concave-convex structure are movably matched.

[0014] Further, the rotor structure further comprises a locking piece, and the locking piece can lock the limiting structure and the balance structure.

[0015] Further, the balance structure comprises a balance ring, the balance ring is sleeved on the rotating shaft, and the balance ring can rotate around the circumferential direction of the rotating shaft.

[0016] Further, the balance structure can be increased in weight or decreased in weight.

[0017] And / or, the balance structure is located at the axial side of the rotor baffle away from the iron core body.

[0018] And / or, the number of the balance structure is two, and the two balance structures are arranged at the axial two sides of the iron core assembly.

[0019] According to another aspect of the present application, an electric machine is provided, comprising a rotor structure, which is the above-mentioned rotor structure.

[0020] The rotor structure and the electric machine provided by the present application can perform dynamic balance adjustment while protecting the rotor structure. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 FIG. 1 is a structural schematic diagram of a rotor structure according to an embodiment of the present application.

[0022] The reference signs are as follows:

[0023] 1, rotor body; 11, iron core assembly; 111, iron core body; 112, rotor baffle; 12, rotating shaft; 2, balance structure; 3, limiting structure; 4, locking piece. DETAILED DESCRIPTION

[0024] For further details, refer to the following description.Figure 1 As shown in the drawings, a rotor structure includes a rotor body 1 and a balancing structure 2, the rotor body 1 includes a core assembly 11 and a rotating shaft 12, the rotating shaft 12 is connected with the core assembly 11; in the axial direction of the rotor structure, the balancing structure 2 has a distance with the core assembly 11, and the balancing structure 2 can correct and balance the rotor body 1. In the application, the distance between the balancing structure 2 and the core assembly 11 is set, and then the balancing structure 2 is used to correct and balance the rotor body 1, so that the dynamic balance adjustment can be carried out while the rotor structure is protected. The application can also avoid the problem that when the initial unbalance of the rotor system is too large, a large range of the rotor baffle 112 needs to be polished on the front and rear rotor baffles 112. The above-mentioned situation will cause serious damage to the rotor baffle 112, even the rotor punching piece, thereby causing a safety hazard. In a more serious case, after the maximum weight is removed, if the dynamic balance level of the high-speed motor still cannot be reached, the motor rotor can only be scrapped, causing a significant waste of resources.

[0025] In addition, the balancing structure 2 has a distance with the core assembly 11, and the balancing structure 2 avoids the permanent magnet in the rotor punching piece at a very safe distance. Whether the polishing weight reduction method or the spot welding weight block weight increasing method is used, the permanent magnet will not cause irreversible demagnetization due to local high temperature, thereby also achieving the purpose of protecting the permanent magnet.

[0026] The balancing structure 2 is a compensation structure, which is designed for rotor dynamic balance. The size, material selection and polishing amount are very flexible, and the operability is greater than the weight reduction on the rotor baffle 112.

[0027] The application also discloses some embodiments. The core assembly 11 includes a core body 111 and a rotor baffle 112, and the rotor baffle 112 is arranged at the axial end of the core body 111. That is, the balancing structure 2 has a distance with the rotor baffle 112, further avoiding the permanent magnet in the rotor punching piece, which can protect the permanent magnet, and also can protect the rotor baffle 112 without increasing the weight on the rotor baffle 112.

[0028] The application also discloses some embodiments. The balancing structure 2 is arranged on the rotating shaft 12, and the balancing structure 2 is movable in the circumferential direction of the rotating shaft 12. That is, the balancing structure 2 moves in the circumferential direction of the rotating shaft 12 to correct and balance the rotor body 1.

[0029] By adjusting the circumferential position of the balancing structure 2, automatic compensation of the unbalance amount is realized, and the size of the initial unbalance of the rotor is greatly reduced.

[0030] The application further discloses some embodiments of the rotor structure, the limiting structure 3 is arranged on the rotating shaft 12, and the balancing structure 2 is movably arranged on the limiting structure 3, so that the balancing structure 2 is movable in the circumferential direction of the rotating shaft 12. The limiting structure 3 can limit the balancing structure 2, so that the balancing structure 2 is movable in the circumferential direction of the rotating shaft 12; and the limiting structure 3 is fixedly connected with the rotating shaft 12.

[0031] The application further discloses some embodiments of the limiting structure 3, the limiting structure 3 comprises a limiting ring, the limiting ring is sleeved on the rotating shaft 12, and the limiting ring is in interference fit with the rotating shaft 12. When the balancing structure 2 is a balancing ring, the balancing structure 2 is in small-gap fit with the rotating shaft 12, and the limiting ring is used to limit the balancing ring, so that the balancing ring is movable in the circumferential direction of the rotating shaft 12.

[0032] The application further discloses some embodiments, the limiting structure 3 is provided with a first concave-convex structure, the balancing structure 2 is provided with a second concave-convex structure, and the first concave-convex structure is movably matched with the second concave-convex structure. The first concave-convex structure is a convex, the second concave-convex structure is a groove, and the convex is movably arranged in the groove; when the limiting structure 3 is a limiting ring and the balancing structure 2 is a balancing ring, the convex is protruded in the axial direction, the groove is recessed in the axial direction, and the convex can be arranged in the groove; and the groove is an annular groove, the convex is an annular convex, the annular convex is arranged in the annular groove, and the annular convex is movable around the circumferential direction of the rotating shaft 12, the annular groove extends around the circumferential direction of the rotating shaft 12, and the annular convex extends around the circumferential direction of the rotating shaft 12.

[0033] The application further discloses some embodiments of the rotor structure, the rotor structure further comprises a locking piece 4, and the locking piece 4 can lock the limiting structure 3 and the balancing structure 2. The locking piece 4 is a fine grinding nut; during assembly, the limiting ring is only needed to be placed into a heating furnace, the limiting ring is kept warm for about half an hour after reaching a preset temperature, the limiting ring can be easily assembled on the motor rotating shaft 12 in interference fit, then the limiting ring is naturally cooled to room temperature, the balancing structure 2 is assembled, and the fine grinding nut is used for locking, so that the assembly is very easy and convenient.

[0034] When the rotor dynamic balance is corrected by using the rotor structure, the initial unbalance of the rotor can be tested by using an instrument, if the initial unbalance is within the allowable range, the balancing structure 2 can be directly polished to remove weight on the outer circle of the balancing structure 2; if the initial unbalance is seriously out of tolerance, the fine grinding nut is loosened, the balancing structure 2 is rotated by a certain angle, and the weight removal is performed until the weight removal amount is within the allowable range, so that the automatic compensation of the entire rotor unbalance can be realized. The method is especially effective for the scene that the initial unbalance is seriously out of tolerance, the risk of damaging the rotor punching sheet when polishing the weight removal on the front and rear rotor baffles 112 is avoided, the initial unbalance of the rotor is not worried to be too large to cause correction failure, and it is unnecessary to worry about damaging the permanent magnet due to the local temperature being too high when the copper column is welded to correct the rotor unbalance.

[0035] The rotor structure of the application mainly includes six parts, i.e. a rotating shaft 12, front and rear rotor baffles 112, a rotor iron core, a precision nut, front and rear balance structures 2, and a precision grinding nut. Each pair of balance structures 2 is assembled with a corresponding limiting structure 3, wherein the limiting structure 3 is located on the inner side and is interference-fitted with the rotating shaft 12, and the balance structure 2 is located on the outer side and is gap-fitted with the shaft. In this way, the orientation of the balance structure 2 can be adjusted at will according to the dynamic balance test result, so as to realize the purpose of automatic compensation of the unbalance.

[0036] The application also discloses some embodiments that the balance structure 2 includes a balance ring, the balance ring is sleeved on the rotating shaft 12, and the balance ring can rotate around the circumference of the rotating shaft 12.

[0037] The application also discloses some embodiments that the balance structure 2 can be increased or decreased in weight; the balance structure 2 can be directly polished to reduce the weight, or the balance structure 2 can be increased in weight.

[0038] The application also discloses some embodiments that the balance structure 2 is located on the axial side of the rotor baffle 112 away from the iron core body 111.

[0039] The application also discloses some embodiments that the number of the balance structure 2 is two, the two balance structures 2 are arranged on the axial two sides of the iron core assembly 11, and one pair of balance structures 2 is added to the rotating shaft 12 which has an axial distance from the two rotor baffles 112. Each balance structure 2 is assembled with a limiting structure, wherein the limiting structure 3 is located on the inner side and is interference-fitted with the rotating shaft 12, and the balance structure 2 is located on the outer side and is gap-fitted with the shaft. A precision nut is further arranged on the outer side of each balance structure 2 and is used for axially locking and fixing the two compensation rings. The structure can realize automatic compensation of dynamic balance by adjusting the circumferential orientation of the balance structure 2, and can also replace the original grinding of the rotor baffle 112 during dynamic balance correction, so as to achieve the purpose of protecting the key components of the electric machine, such as the rotor baffle 112 and the rotor punching sheet.

[0040] According to the embodiments of the application, a motor is provided, which includes the above-mentioned rotor structure. The motor of the application is a high-speed motor. A pair of balance structures 2 is designed on the shaft section near the rotor iron core at the two ends of the high-speed motor, so as to replace the original technology of directly reducing the weight on the rotor baffle 112. The scheme has the advantages of simple structure, easy operation, automatic compensation of the initial unbalance, and protection of the rotor baffle 112, the rotor punching sheet and the permanent magnet.

[0041] Those skilled in the art can easily understand that the above-mentioned advantageous modes can be freely combined and superimposed without conflict.

[0042] The above merely preferred embodiments of the present application and are not intended to limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is merely the preferred embodiments of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and variations can be made, and these improvements and variations should be considered as the protection scope of the present application.

Claims

1. A rotor structure, characterized in that: include: A rotor body (1), the rotor body (1) comprising an iron core assembly (11) and a rotating shaft (12), the rotating shaft (12) being connected to the iron core assembly (11); A balancing structure (2), wherein a distance is provided between the balancing structure (2) and the core assembly (11) in the axial direction of the rotor structure, and the balancing structure (2) is capable of performing balancing correction on the rotor body (1); The core assembly (11) comprises a core body (111) and a rotor baffle (112), wherein the rotor baffle (112) is arranged at an axial end of the core body (111); The balancing structure (2) is arranged on the rotating shaft (12), and the balancing structure (2) is movable in the circumferential direction of the rotating shaft (12); The rotor structure further comprises a limiting structure (3), wherein the limiting structure (3) is arranged on the rotating shaft (12), and the balancing structure (2) is movably arranged on the limiting structure (3), so that the balancing structure (2) is movable in the circumferential direction of the rotating shaft (12); The limiting structure (3) comprises a limiting ring, the limiting ring is sleeved on the rotating shaft (12), and the limiting ring and the rotating shaft (12) are interference fit; The rotor structure further comprises a locking member (4), and the locking member (4) is capable of locking the limiting structure (3) and the balancing structure (2).

2. The rotor structure according to claim 1, characterized in that: The limiting structure (3) is provided with a first concave-convex structure, and the balancing structure (2) is provided with a second concave-convex structure, and the first concave-convex structure and the second concave-convex structure are movably matched.

3. The rotor structure according to claim 1, characterized in that: The balancing structure (2) comprises a balancing ring, which is sleeved on the rotating shaft (12) and can rotate around the circumference of the rotating shaft (12).

4. The rotor structure according to claim 1, characterized in that: The balancing structure (2) is capable of increasing or decreasing weight; And / or, the balancing structure (2) is located on an axial side of the rotor baffle (112) away from the core body (111); And / or, the number of the balancing structures (2) is set to two, and the two balancing structures (2) are respectively arranged on both axial sides of the core assembly (11).

5. A motor comprising a rotor structure, characterized in that: The rotor structure is the rotor structure according to any one of claims 1 to 4.

Images