Permanent magnet rotor punching sheet structure satisfying multi-segment skewed pole scheme

Abstract

The utility model relates to the technical field of motors, and discloses a permanent magnet rotor punching sheet structure satisfying a multi-segment skewed pole scheme, which comprises rotor iron cores, the rotor skewed pole structure is a multi-segment rotor skewed pole structure formed by overlapping a plurality of rotor iron cores, the plurality of rotor iron cores are coaxially overlapped, and the rotor iron cores are coaxially overlapped. The rotor core is laminated to form at least four sections, the dislocation angle between every two adjacent rotor core sections is theta, four key grooves are formed in the edge of a center hole of the rotor core, rivet holes matched with the key grooves are formed in the rotor core, the four key grooves are staggered by the angle theta, and the angle theta is larger than the angle theta. And the four key grooves are symmetrically formed in the rotor iron core. According to the permanent magnet rotor punching sheet structure meeting the multi-section skewed pole scheme, the multi-section skewed pole can be realized by adopting the structure that one punching sheet is provided with a plurality of holes and key grooves which are staggered in angle, so that the mold opening, manufacturing and generating costs are reduced, and the multi-section skewed pole performance of a motor can be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a permanent magnet rotor punching structure that meets a multi-section skew pole solution. Background Art

[0002] Motor rotor pole skewing can effectively reduce harmonic components, reduce electromagnetic vibration and noise, reduce torque pulsation and optimize cogging torque. Since continuous rotor pole skewing is difficult to achieve in terms of technology, segmented pole skewing is currently used. The more segments the segmented pole skewing has, the closer the effect is to continuous pole skewing.

[0003] Currently, the methods for achieving multi-segment skewed poles in motors are to use several different punching sheet structures or to perform post-processing after the core is stacked. This method increases the mold opening cost, manufacturing and assembly cost during motor production. Therefore, a permanent magnet rotor punching sheet structure that meets the multi-segment skewed pole solution is urgently needed to solve the above problems. Utility Model Content

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the utility model provides a permanent magnet rotor punching sheet structure that meets the multi-stage skew pole solution, which has the advantages of low cost and solves the problem that the current method of realizing multi-stage skew pole in motors adopts several different punching sheet structures or performs post-processing after the iron core is stacked. This method increases the mold opening cost, manufacturing and assembly cost of the motor during production.

[0006] (2) Technical solution

[0007] The technical solution of the present invention for solving the above-mentioned technical problems is as follows: a permanent magnet rotor punching structure that meets the multi-segment skew pole solution includes a rotor core, a multi-segment rotor skew pole structure formed by stacking multiple rotor cores together, multiple rotor cores are coaxially stacked, and the rotor cores are stacked into at least four segments. The staggered angle between two adjacent rotor core segments is θ, four key slots are provided on the edge of the center hole of the rotor core, rivet holes adapted to the key slots are provided inside the rotor core, the four key slots are staggered by an angle of θ, and the four key slots are symmetrically provided on the rotor core.

[0008] The beneficial effects of the utility model are:

[0009] The permanent magnet rotor punching sheet structure that meets the multi-stage skew pole solution adopts a structure in which a plurality of holes and keyways at staggered angles are provided on a punching sheet to realize multi-stage skew poles, thereby reducing mold opening, manufacturing and production costs, and ensuring the multi-stage skew pole performance of the motor.

[0010] On the basis of the above technical solution, the present invention can also be improved as follows.

[0011] Furthermore, the thickness of the rotor core is 0.2-0.5 mm.

[0012] Furthermore, the four rotor cores are installed by using two rivet holes.

[0013] Furthermore, a plurality of magnet slots are provided at the edge of the rotor core in a circumferential array at the center hole.

[0014] Furthermore, the magnet slots have the same shape, and two adjacent magnet slots are symmetrical. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the utility model;

[0016] Figure 2 This is a front view of the superimposed structure of the utility model;

[0017] Figure 3 It is a schematic diagram of the overlapping structure of the utility model.

[0018] In the figure: 1, first keyway; 2, second keyway; 3, third keyway; 4, fourth keyway; 5, rivet hole; 6, rotor core; 7, axis of symmetry. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] In the embodiment, Figure 1-3 A permanent magnet rotor punching structure that meets the multi-segment skew pole solution is provided. The utility model includes a rotor core 6, a multi-segment rotor skew pole structure formed by stacking multiple rotor cores 6 together, multiple rotor cores 6 are coaxially stacked, and the rotor core 6 is stacked into at least four segments. The staggered angle between two adjacent rotor core 6 segments is θ, and four key slots are provided on the edge of the center hole of the rotor core 6. Rivet holes 5 that are compatible with the key slots are provided inside the rotor core 6. The four key slots are staggered by an angle of θ, and the four key slots are symmetrically opened on the rotor core 6.

[0021] A set of punching dies is used to form the rotor core 6. The thickness of the rotor core 6 is 0.2 to 0.5 mm. The four rotor cores 6 are installed using two rivet holes 5. A plurality of magnet slots are arranged in a circular array at the center hole at the edge of the rotor core 6. The magnet slots have the same shape and two adjacent magnet slots are symmetrical.

[0022] Taking an 8-pole rotor as an example, the 1 to 4-segment rotor skew pole segmentation scheme is divided into 4 segments to illustrate the technical solution of the present invention. The punching structure diagram is shown in the attached figure. Figure 1 As shown, it is assumed that the rotor core 6 has four skew poles, each staggered by an angle of θ, and each is provided with Figure 1 The four rivet holes 5 and keyways shown in the figure ensure that the angle θ between each rivet hole 5 and keyway is staggered so that the reference line is the midline between the two poles, and four more rivet holes 5 and keyways are opened at symmetrical positions about the symmetry axis 7 as shown in the figure.

[0023] When assembling, press Figure 1 Taking the first slot key 1 of the first section rotor core as a reference, the second slot key 2 of the second section rotor core is aligned with the first slot key 1 of the first section rotor core for assembly, the third slot key 3 of the third section rotor core is aligned with the first slot key 1 of the first section rotor core for assembly, and the fourth slot key 4 of the fourth section rotor core is aligned with the first slot key 1 of the first section rotor core for assembly.

[0024] See attached picture after assembly Figure 2 , Attachment Figure 3 , as attached Figure 2 As shown, each section of the rotor core is staggered by an angle of θ, realizing the four-section skew pole of the rotor. The four sections of the rotor core can be fixed through two rivet holes and fixed to the shaft through two keyways, ensuring the reliability of the rotor structure.

[0025] Of course, as long as the symmetrical structure is cancelled and the hole and keyway are extended to the other end of the punch, this method can also be used to achieve 5 to 8 sections of oblique poles, but it can only be fixed and matched through one rivet hole and keyway. The structural reliability is not as high as the above solution, so I will not go into details here.

[0026] This structure of using a punching plate with multiple holes and keyways at staggered angles can realize multi-stage skew poles, reduce mold opening, manufacturing and production costs, and ensure the multi-stage skew pole performance of the motor.

[0027] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0028] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A permanent magnet rotor lamination structure that meets the multi-stage skew pole solution, comprising a rotor core (6), characterized in that: A plurality of the rotor cores (6) are stacked together to form a multi-segment rotor skew pole structure. The plurality of the rotor cores (6) are coaxially stacked. The rotor cores (6) are stacked into at least four segments. The staggered angle between two adjacent segments of the rotor core (6) is θ. Four key slots are provided on the edge of the center hole of the rotor core (6). Rivet holes (5) adapted to the key slots are provided inside the rotor core (6). The four key slots are staggered by an angle of θ, and the four key slots are symmetrically provided on the rotor core (6).

2. The permanent magnet rotor lamination structure that satisfies the multi-stage skew pole solution according to claim 1, characterized in that: The thickness of the rotor core (6) is 0.2-0.5 mm.

3. The permanent magnet rotor lamination structure that satisfies the multi-stage skew pole solution according to claim 1, characterized in that: The four rotor cores (6) are installed by means of two rivet holes (5).

4. The permanent magnet rotor lamination structure that satisfies the multi-stage skew pole solution according to claim 1, characterized in that: A plurality of magnet slots arranged in a circumferential array at the center hole are provided at the edge of the rotor core (6).

5. The permanent magnet rotor lamination structure that satisfies the multi-stage skew pole solution according to claim 4, characterized in that: The magnet slots have the same shape, and two adjacent magnet slots are symmetrical.

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