Sectional type motor rotor iron core

Abstract

The utility model discloses a sectional type motor rotor core, which comprises a plurality of spliced arc-shaped section bodies, a plurality of inverted trapezoidal blocks are arranged on the outer arc surfaces of the arc-shaped section bodies at intervals, a dovetail groove is formed between every two adjacent inverted trapezoidal blocks, and concave positions are arranged in the middle positions of the tops of the inverted trapezoidal blocks. According to the utility model, a sectional structure is adopted, the magnetic steel is composed of a plurality of arc-shaped section bodies, the magnetic steel can be stably fixed on the rotor core through the dovetail grooves between the two adjacent inverted trapezoidal blocks on the arc-shaped section bodies, the installation is simple and convenient, and when the inverted trapezoidal blocks are expanded under the action of external force through the concave positions, the magnetic steel can be stably fixed on the rotor core. The matching tightness of the dovetail groove and the magnetic steel can be improved, so that the magnetic steel body is not easy to loosen and fall off, the structural stability is good, and the reliability of the rotor core during high-speed operation is effectively ensured; and meanwhile, the magnetic steel is positioned on the outer arc surface of the arc-shaped section body, so that the gap between the rotor and the stator is effectively reduced, the magnetic flux utilization rate is improved, and the motor performance is enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely relates to a sectional motor rotor core applied in motor. BACKGROUND

[0002] In the existing motor technology, the rotor core is one of the core components of the motor, and the selection of its structure and material has a crucial influence on the overall performance of the motor. The traditional rotor core adopts a monolithic design, which although guarantees the integrity of the structure to some extent, has many inconveniences in manufacturing, assembly and maintenance.

[0003] Therefore, a sectional structure rotor is introduced to the market. For example, the invention disclosed in publication No. "CN102598477A" discloses a rotor of a motor, which is formed by a single segment, wherein each single segment has a first part which, in the assembled state, is in contact with a corresponding second part of an adjacent single segment. The first part of the single segment and the corresponding second part of the adjacent single segment are so constituted that a form fit is formed between the first part and the second part in the radial direction and the circumferential direction. By the form fit in the radial direction and the circumferential direction, a self-supporting annular structure of the assembled rotor is formed. The single segment has an axial opening for accommodating a permanent magnet, i.e. the axial opening is a closed structure in the cross-sectional direction, and the outer wall of the axial opening has a certain thickness, which increases the gap between the rotor and the stator, resulting in a relatively weak magnetic interaction between the stator and the rotor, thereby reducing the performance of the motor. SUMMARY

[0004] In view of the above-mentioned deficiencies, the purpose of the utility model is to provide a sectional motor rotor core with a reasonable structure design, easy assembly and reduced gap between the rotor and the stator.

[0005] To achieve the above-mentioned purpose, the technical solution provided by the utility model is as follows:

[0006] A sectional motor rotor core includes a plurality of arc-shaped segments that are spliced together, a plurality of inverted trapezoidal blocks are arranged on the outer circular arc surface of the arc-shaped segments at intervals, a dovetail groove for inserting a magnetic steel is formed between the two adjacent inverted trapezoidal blocks, and a recessed position is arranged at the top middle position of the inverted trapezoidal block.

[0007] As a preferred solution of the utility model, one end of the arc-shaped segment is provided with a connecting strip, and the end of the connecting strip is provided with a circular clamping head; the other end of the arc-shaped segment is provided with a connecting groove matched with the connecting strip, and the inner end of the connecting groove is provided with a circular clamping cavity matched with the circular clamping head. By matching the connecting strip and the connecting groove and matching the circular clamping head and the circular clamping cavity, the adjacent arc-shaped segments are tightly connected and firmly connected, thereby ensuring the integrity and roundness of the rotor core.

[0008] As a preferred scheme of the utility model, the length size of the connecting strip is greater than the radius size of the circular clamp. When connecting, the connecting strip has enough length to cooperate with the connecting groove, so that the connection is more stable and can bear greater radial force, further improving the stability and reliability of the rotor core during high-speed operation.

[0009] As a preferred scheme of the utility model, the recess is in U shape or V shape. The recess can make the inverted trapezoidal block be expanded under external force, so that the tightness of the dovetail groove and the magnetic steel is improved, and the magnetic steel body is not prone to loosening and falling off.

[0010] As a preferred scheme of the utility model, the inner arc surface of the arc segment body is provided with a positioning notch at the middle position, so that the rotor core can be accurately positioned when being installed on the motor shaft, the motor vibration and noise caused by installation deviation are avoided, and the motor operation stability and service life are improved.

[0011] As a preferred scheme of the utility model, the arc segment body is one-sixteenth arc length, and the number of the inverted trapezoidal blocks on each arc segment body is four.

[0012] The utility model has the advantages of reasonable structure, segmented structure, multiple arc segment bodies, the dovetail groove between the adjacent inverted trapezoidal blocks on the arc segment body can stably fix the magnetic steel on the rotor core, simple and convenient installation, the recess can make the inverted trapezoidal block be expanded under external force, the tightness of the dovetail groove and the magnetic steel is improved, the magnetic steel body is not prone to loosening and falling off, the structure is stable, the reliability of the rotor core during high-speed operation is effectively ensured, the magnetic steel is located on the outer arc surface of the arc segment body, the gap between the rotor and the stator is effectively reduced, the magnetic flux utilization rate is improved, and the motor performance is enhanced.

[0013] The utility model is further described below in combination with the drawings and the embodiments. DRAWINGS

[0014] Fig. 1 It is the three-dimensional structure schematic diagram of the utility model.

[0015] Fig. 2 It is the main view structure schematic diagram of the utility model.

[0016] Fig. 3 It is the structure schematic diagram when the utility model is assembled into the rotor core. CONCRETE IMPLEMENTING METHOD

[0017] Embodiment, see Figs. 1 to 3The embodiment provides a segmented motor rotor core, which comprises a plurality of arc-shaped segment bodies 1 spliced together, specifically, a connecting strip 2 is arranged at one end of the arc-shaped segment body 1, and a circular clamping head 3 is arranged at the end of the connecting strip 2; the other end of the arc-shaped segment body 1 is provided with a connecting groove 4 matched with the connecting strip 2, and a circular clamping cavity 5 matched with the circular clamping head 3 is arranged at the inner end of the connecting groove 4. The adjacent arc-shaped segment bodies 1 are tightly connected and firmly connected through the cooperation of the connecting strip 2 and the connecting groove 4 and the cooperation of the circular clamping head 3 and the circular clamping cavity 5, so that the integrity and the roundness of the rotor core are ensured. Preferably, the length of the connecting strip 2 is greater than the radius of the circular clamping head 3. When the connecting strip 2 is connected with the connecting groove 4, the length of the connecting strip 2 is sufficient, so that the connection is more stable, can bear greater radial force, and the stability and reliability of the rotor core during high-speed operation are further improved.

[0018] A plurality of inverted trapezoidal blocks 6 are arranged at intervals on the outer arc surface of the arc-shaped segment body 1. In the embodiment, the number of the arc-shaped segment bodies 1 is sixteen, that is, the arc-shaped segment body 1 is one-sixteenth of the arc length, and the number of the inverted trapezoidal blocks 6 on each arc-shaped segment body 1 is four. In other embodiments, the number of the arc-shaped segment bodies 1 can be reasonably adjusted.

[0019] Two adjacent inverted trapezoidal blocks 6 form a dovetail groove 7 for inserting a magnetic steel. A recess 8 is arranged at the middle position of the top of the inverted trapezoidal block 6. In the embodiment, the recess 8 is in the shape of U, and in other embodiments, the recess 8 can also be in the shape of V. When the inverted trapezoidal block 6 is expanded under external force, the dovetail groove 7 and the magnetic steel are more tightly matched, so that the magnetic steel body is not prone to loosening and falling off.

[0020] A positioning notch 9 is arranged at the middle position of the inner arc surface of the arc-shaped segment body 1, so that the rotor core can be accurately positioned when being mounted on the motor shaft, the motor vibration and noise caused by installation deviation are avoided, and the motor running stability and service life are improved.

[0021] When assembled, the magnetic steel can be directly inserted into the dovetail groove 7 for fixation, so that the installation is simple and convenient, and the work efficiency is effectively improved; then the inverted trapezoidal block 6 is expanded to both sides through the recess 8, that is, the width of the dovetail groove 7 is narrowed, the dovetail groove 7 and the magnetic steel are more tightly matched, so that the magnetic steel body is not prone to loosening and falling off, the structure stability is good, and the reliability of the rotor core during high-speed operation is effectively ensured.

[0022] During work, since the magnetic steel is located on the outer arc surface of the arc-shaped segment body 1, the gap between the magnetic steel and the stator is small, the magnetic force between the stator and the rotor is effectively enhanced, and the motor performance is improved.

[0023] According to the disclosure and teaching of the above description, the skilled in the art of the utility model can also change and modify the above-mentioned embodiments. Therefore, the utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes of the utility model should also fall within the protection scope of the claims of the utility model. In addition, although some specific terms are used in the specification, these terms are only for convenience of description and do not constitute any limitation on the utility model. As described in the above embodiments of the utility model, other rotor cores obtained by using the same or similar structure are also within the protection scope of the utility model.

Claims

1. A segmented motor rotor core comprising a number of arc-shaped segment bodies spliced together, characterized in that, The outer arc surface of the arc segment body is provided with a plurality of inverted trapezoidal blocks at intervals, and a dovetail groove for inserting a magnetic steel is formed between two adjacent inverted trapezoidal blocks.

2. The segmented motor rotor core of claim 1, wherein: One end of the arc segment body is provided with a connecting strip, and the end of the connecting strip is provided with a circular clamping head.

3. The segmented motor rotor core of claim 2, wherein: The length of the connecting strip is greater than the radius of the circular clamping head.

4. The segmented motor rotor core of claim 1, wherein: The recess is in the shape of a U or V.

5. The segmented motor rotor core of claim 1, wherein: The arc segment body is provided with a positioning notch at the middle position of the inner arc surface.

6. A segmented motor rotor core according to any one of claims 1-4, characterized in that: The arc segment body is one-sixteenth of an arc length, and each arc segment body is provided with four inverted trapezoidal blocks.

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