CN210225092U

CN210225092U - Injection molding rotor and motor

Info

Publication number: CN210225092U
Application number: CN201921556025.4U
Authority: CN
Inventors: Hongbiao Du; 杜洪彪; Yiwei Li; 李贻伟; Long Li; 李龙; Jun Wang; 王珺; Wenyi Qi; 戚文意
Original assignee: Wolong Electric (ji'nan) Motor Co Ltd; Wolong Electric Drive Group Co Ltd
Current assignee: Wolong Electric (ji'nan) Motor Co Ltd; Wolong Electric Drive Group Co Ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-03-31
Anticipated expiration: 2029-09-18

Abstract

The utility model discloses a rotor and motor of moulding plastics belongs to motor technical field, and aim at overcomes the circuit board of the built-in motor of current circuit board and the defect that the rotor of moulding plastics takes place easily to interfere. The injection molding rotor comprises a rotor core, a magnet groove is formed in the rotor core, a permanent magnet is arranged in the magnet groove, injection molding layers are attached to the rotor core and the permanent magnet, the injection molding layers cover the inner end part of the first end face of the permanent magnet, and the middle part and the outer end part of the first end face of the permanent magnet are flush with the injection molding layers corresponding to the side edges and the outer edges. The utility model provides a rotor and motor of moulding plastics, the rotor of moulding plastics when assembling the motor, because the middle part of the first terminal surface of permanent magnet and the layer parallel and level of moulding plastics that outer tip and side and outside correspond, the circuit board with mould plastics the distance increase that the rotor corresponds the position, guarantee on the circuit board components and parts or solder joint and the rotor of moulding plastics and do not take place phenomenons such as friction, make the motor move smoothly.

Description

Injection molding rotor and motor

Technical Field

The utility model belongs to the technical field of the motor, a rotor and motor of moulding plastics is related to.

Background

The existing motor with the injection molding rotor is characterized in that a circuit board is arranged in a motor body, the designed motor structure is very compact, the motor cost is reduced, the product competitiveness is improved, however, components or welding spots on the circuit board are easy to interfere with the injection molding rotor, and the motor quality is further influenced.

Disclosure of Invention

The utility model discloses the problem to prior art existence provides a rotor and motor of moulding plastics, and aim at overcomes the circuit board of the built-in motor of current circuit board and the defect that the rotor of moulding plastics takes place easily to interfere.

The utility model discloses a realize like this:

the injection molding rotor is characterized in that the injection molding layer covers the inner end part of the first end face of the permanent magnet, and the middle part and the outer end part of the first end face of the permanent magnet are flush with the injection molding layer corresponding to the side edge and the outer edge.

Preferably, the periphery of the second end face of the permanent magnet is wrapped by the injection molding layer.

Preferably, the radial length of the permanent magnet is greater than the tangential length of the permanent magnet.

Preferably, the number of the permanent magnets is even and is greater than or equal to two.

Preferably, the end of the permanent magnet is chamfered.

Preferably, the material of the injection molding layer is PA or PBT.

The motor comprising the injection molding rotor is characterized by comprising a stator, wherein a circuit board is fixed on the stator, the circuit board and the first end face of the permanent magnet are correspondingly arranged, and components on the circuit board are arranged corresponding to the middle part and the outer end part of the first end face of the permanent magnet.

The utility model provides a rotor and motor of moulding plastics, the rotor of moulding plastics is when assembling the motor, because the middle part of the first terminal surface of permanent magnet and the layer parallel and level of moulding plastics that outer tip and side and outside correspond, the circuit board with mould plastics the distance increase that the rotor corresponds the position, guarantee that components and parts or solder joint on the circuit board and the rotor of moulding plastics do not take place phenomenons such as friction, make the motor move smoothly, also be favorable to the manufacturing and the assembly of motor, improve and make assembly efficiency and guarantee motor quality.

Drawings

FIG. 1 is a schematic view of a motor structure;

FIG. 2 is an exploded view of the motor;

FIG. 3 is a schematic cross-sectional view of the motor;

FIG. 4 is a schematic diagram of a circuit board;

FIG. 5 is a schematic view of a first angular configuration of an injection molded rotor;

FIG. 6 is a second angular configuration of the injection molded rotor;

FIG. 7 is a third angular configuration of an injection molded rotor;

FIG. 8 is a sectional view taken along line A-A of FIG. 7;

fig. 9 is a schematic structural view of the permanent magnet assembled on the rotor core.

Reference is made to the accompanying drawings in which: 100. a stator; 110. a cover plate; 200. injection molding the rotor; 210. a rotor core; 220. a permanent magnet; 221. a first end face; 222. a second end face; 223. chamfering; 230. an injection molding layer; 300. a circuit board; 310. and (6) a component.

Detailed Description

The following detailed description is made of specific embodiments of the present invention with reference to the accompanying drawings, so as to make the technical solution of the present invention easier to understand and master. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.

The present embodiment provides a motor including the above-mentioned injection molded rotor, as shown in fig. 1 to 4, comprising a stator 100 and an injection molded rotor 200, wherein the injection molded rotor 200 is rotatably disposed in the stator 100 through a bearing, a circuit board 300 is fixed on the stator 100, and the circuit board is pressed on the stator 100 through a cover plate 110.

As shown in fig. 5-9, the injection molded rotor 200 includes a rotor core 210, the rotor core 210 has a magnet slot, a permanent magnet 220 is disposed in the magnet slot, and an injection molded layer 230 is attached to both the rotor core 210 and the permanent magnet 220. Referring to fig. 8, the injection molding layer 230 covers the inner end of the first end surface 221 of the permanent magnet 220, and the injection molding layer 230 covering the inner end of the first end surface 221 of the permanent magnet 220 protrudes from the first end surface 221 of the permanent magnet 220. The middle and outer ends of the first end surface 221 of the permanent magnet 220 are flush with the injection layer 230 corresponding to the side edge and the outer edge, i.e. the first end surface 221 of the permanent magnet 220 is not covered by the injection layer 230 except the part covered by the injection layer 230, and the exposed state is processed, and as shown in fig. 5, the injection layer 230 corresponding to the two side edges and the outer edge of the exposed part is flush with the first end surface 221 of the permanent magnet 220, i.e. the corresponding injection layer 230 does not protrude from the first end surface 221 of the permanent magnet 220, so that the distance between the peripheral part of the injection rotor 200 and the circuit board 300 can be increased without changing the distance between the permanent magnet 220 and the circuit board 300. As shown in fig. 3 and 4, the circuit board 300 and the first end surface 221 of the permanent magnet 220 are correspondingly disposed, and the components 310 on the circuit board 300 are disposed corresponding to the middle and outer end portions of the first end surface 221 of the permanent magnet 220, so as to ensure that the components 310 or solder joints on the circuit board 300 do not rub against the injection rotor 200, thereby enabling the motor to smoothly operate, facilitating the manufacturing and assembly of the motor, improving the manufacturing and assembly efficiency, and ensuring the quality of the motor. When the component 310 includes a hall element, the hall element needs to sense the position of the injection molding rotor 200 through the magnetic field of the permanent magnet 220, which not only ensures the distance that the hall element can sense the magnetic field, but also ensures the mechanical distance between the hall element and the injection molding rotor 200.

As shown in fig. 6, the permanent magnet 220 is wrapped around the second end face 222 by the injection molded layer 230. As shown in fig. 9, the radial length of the permanent magnet 220 is greater than the tangential length of the permanent magnet 220. As shown in fig. 9, the number of the permanent magnets 220 is even and two or more, and the number of the permanent magnets 220 in the present embodiment is eight. As shown in fig. 8-9, the end of the permanent magnet 220 is provided with a chamfer 223, and the injection molding layer 230 can be attached to the chamfer 223, so as to form better constraint on one end of the first end surface 221 of the permanent magnet 220 and improve the stability of fixing the permanent magnet 220. The material of the injection layer 230 is PA plastic or PBT plastic.

The above-mentioned embodiments are merely illustrative of the present invention, and not intended to limit the present invention, and any replacement or change made without inventive work within the spirit and scope of the present invention is within the scope of the present invention.

Claims

1. The injection molding rotor comprises a rotor core (210), wherein a magnet groove is formed in the rotor core (210), a permanent magnet (220) is arranged in the magnet groove, and injection molding layers (230) are attached to the rotor core (210) and the permanent magnet (220), and is characterized in that the injection molding layers (230) cover the inner end part of a first end surface (221) of the permanent magnet (220), and the middle part and the outer end part of the first end surface (221) of the permanent magnet (220) are flush with the injection molding layers (230) corresponding to the side edges and the outer edges.

2. An injection moulded rotor according to claim 1, characterised in that the second end face (222) of the permanent magnet (220) is surrounded by the injection moulded layer (230).

3. An injection moulded rotor according to claim 1, characterised in that the radial length of the permanent magnets (220) is larger than the tangential length of the permanent magnets (220).

4. An injection moulded rotor according to claim 1, characterised in that the number of permanent magnets (220) is even and equal to or greater than two.

5. An injection moulded rotor according to claim 1, characterised in that the ends of the permanent magnets (220) are provided with chamfers (223).

6. An injection moulded rotor according to claim 1, characterised in that the material of the injection moulded layer (230) is PA or PBT.

7. An electric machine comprising an injection molded rotor according to any one of claims 1 to 6, comprising a stator (100), wherein a circuit board (300) is fixed on the stator (100), the circuit board (300) and the first end surface (221) of the permanent magnet (220) are correspondingly arranged, and components (310) on the circuit board (300) are arranged corresponding to the middle part and the outer end part of the first end surface (221) of the permanent magnet (220).