CN210041451U

CN210041451U - Motor for electric tool with adjustable stator inner diameter

Info

Publication number: CN210041451U
Application number: CN201921289926.1U
Authority: CN
Inventors: 叶晓波; 范洪刚
Original assignee: Ningbo Leading Intelligent Equipment Co Ltd
Current assignee: Ningbo Leading Intelligent Equipment Co Ltd
Priority date: 2019-08-10
Filing date: 2019-08-10
Publication date: 2020-02-07
Anticipated expiration: 2029-08-10

Abstract

The utility model provides a stator internal diameter adjustable motor for electric tool. The motor comprises a stator assembly and a rotor assembly arranged in the stator assembly, wherein the stator assembly comprises: the stator yoke is uniformly provided with a plurality of grooves on the inner side, at least one side wall of each groove is provided with a first tooth part, a plurality of stator teeth comprise a base part and a shoulder part which is integrally formed with the base part, one side surface part of the base part is provided with a second tooth part, one side of the base part is embedded into the groove, and at least part of the second tooth part arranged on one side surface of the base part is meshed with the first tooth part. Therefore, when the large-scale motor is produced, stator yokes and stator teeth of the stator assembly with the same size only need to be produced in batches, and the stator assembly is assembled according to the calculated tooth yoke gap during assembly. Thus, the production design efficiency is improved, and the economical efficiency of motor production is further improved. In addition, the embodiment can also improve the power density of the motor by slightly adjusting the gap of the tooth yoke of the motor, so that the performance of the motor is maximized.

Description

Motor for electric tool with adjustable stator inner diameter

Technical Field

The utility model relates to a motor specifically relates to a stator internal diameter adjustable motor for electric tool.

Background

With the maturity of motor technology, more and more brushless motors are applied to electric tools, and in the stator structure of the motor used in the current electric tools, an integrated stator structure is mostly adopted as shown in fig. 1, and the diameter of the stator in the figure is a fixed value, that is, the ratio of the outer diameter of the stator to the inner diameter of the stator is a fixed value, so that when the inner diameter of the stator is fixed, the power of the motor is basically consistent with that of a platform motor. The basic variation amplitude of the moment is small. When the motor is required to have a relatively strong power range in some occasions, such as the motor outputs a relatively large torque, or a high-speed motor is required to be realized, the vibration is small, or the motor realizes high speed and low vibration working conditions, and the like, at the moment, each motor of the type needs to be opened independently, so that the economy is low when various motors are required, and the requirements cannot be met.

SUMMERY OF THE UTILITY MODEL

The purpose of the present invention is to solve at least one of the technical drawbacks. Based on the problem, the utility model relates to a can change motor of stator internal diameter, like this through adjustment L distance for the stator internal diameter changes, can obtain stronger power scope.

Therefore, the utility model adopts the following technical scheme.

A motor for an electric tool with an adjustable stator inner diameter is characterized by comprising a stator component and a rotor component arranged in the stator component,

the stator assembly includes:

a stator yoke in which a plurality of slots are uniformly arranged, at least one side wall of the slots being provided with first teeth,

and a stator tooth including a base portion and a shoulder portion integrally formed therewith, a surface portion of one side of the base portion being provided with a second tooth portion, the one side of the base portion being inserted into the slot with a portion of the second tooth portion meshing with a portion of the first tooth portion.

Preferably, the first tooth portions are disposed on both side walls of the groove; the two side surface parts of the base part are provided with second tooth parts, and one side of the base part is embedded into the groove, so that the second tooth parts are meshed with the first tooth parts.

Preferably, the second tooth portion is provided with a plurality of parallel protrusions at equal intervals.

Preferably, the protrusions are triangular or square.

Preferably, 9 slots are uniformly arranged inside the stator yoke.

Preferably, the included angle between the two ends of the shoulder is 5-30 degrees.

Preferably, the number of slots is equal to or greater than the number of stator teeth.

Preferably, the ratio of the length of the second tooth part to the length of the base part is 0.1-0.5.

Preferably, a plurality of teeth are arranged in the second tooth part, and the distance between two adjacent teeth is 0.1 mm-1.0 mm.

Preferably, the stator yoke has a plurality of protrusions or recesses uniformly arranged in the circumferential direction, and the ratio of the length of the protrusions or recesses to the length of the slots in the circumferential direction is 0.1-1

For the scheme among the prior art, the utility model discloses an advantage:

by adopting the motor of the embodiment of the application, the inner diameter of the stator is adjustable. The L distance can be changed to realize the change of the diameter and the inner diameter of the stator: if the output torque of the motor is increased, the inner diameter is reduced, and the motor can easily realize high rotating speed and low vibration working conditions. In the large-scale production, the stator yoke and the stator teeth are produced in batches, and the stator yoke and the stator teeth are assembled according to the calculated tooth yoke gap in the assembling process. The embodiment can further optimize the shaped motor and improve the power density of the shaped motor.

Drawings

The invention will be further described with reference to the following drawings and examples:

fig. 1 is a schematic structural diagram of a stator of a conventional motor;

fig. 2 is a schematic structural diagram of a stator assembly according to an embodiment of the present invention;

FIG. 3 is an enlarged schematic view of the stator teeth of FIG. 2;

fig. 4 and 5 are schematic structural views of a stator yoke according to an embodiment of the present invention.

Detailed Description

The above-described scheme is further illustrated below with reference to specific examples. It should be understood that these examples are for illustrative purposes and are not intended to limit the scope of the present invention. The conditions used in the examples may be further adjusted according to the conditions of the particular manufacturer, and the conditions not specified are generally the conditions in routine experiments.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only.

Example (b):

the embodiment of the application provides a stator assembly, which comprises a stator yoke, a plurality of slots are arranged at intervals on the inner side of the stator yoke, a first tooth part is arranged on the side wall of each slot, a plurality of stator teeth, and second tooth parts matched with the first tooth part of the slot on the inner side of the stator yoke are respectively arranged on two sides of one end of each stator tooth. The stator teeth are mounted to the stator yoke by the cooperation of the first teeth portion and the second teeth portion during assembly. The distance from the end part of the stator teeth on the second tooth side to the bottom of the slot is adjustable (namely the tooth yoke gap L is adjustable), and the design has the advantage that when the stator assembly is produced on a large scale, the stator yoke and the stator teeth of the same size only need to be produced in batch, and the stator assembly can be assembled according to the calculated tooth yoke gap when the stator assembly is assembled. Thus, the production design efficiency is improved, and the economy of the motor is further improved. In addition, the embodiment can further optimize the shaped motor, and the power density of the motor can be further improved by finely adjusting the gap of the tooth yoke.

The electric machine according to an embodiment of the present invention will be described next with reference to fig. 2 to 5. The drawings include schematic diagrams, and the scale and the vertical-to-horizontal ratio of each component may be different from those of the actual components.

As shown in fig. 2, which is a cross-sectional view of a stator assembly 100 according to an embodiment of the present invention, the stator assembly 100 includes a stator yoke 101, a plurality of stator teeth 102, a plurality of slots 101a uniformly arranged circumferentially inside the stator yoke 101, the slots 101a being used for fixing the stator teeth 102; the stator teeth 102 include a base portion 102a having one side portion embedded in the groove 101a, and a gap between an end portion of the base portion 102a and a bottom portion of the groove 101a is adjustable. The other end of the base 102a is connected to the shoulder.

As shown in fig. 3, which is a schematic structural diagram of a stator tooth according to an embodiment of the present disclosure, the stator tooth 102 includes a base portion 102a and a shoulder portion 102b, and the base portion 102a and the shoulder portion 102b are integrally formed. The base portion 102a has second teeth 102a1 disposed on opposite side surface portions thereof, and is fitted into the slots of the stator via the second teeth 102a 1. In the present embodiment, the second tooth portion 102a1 is disposed at the middle-lower portion of the base portion (i.e., on the side closer to the end surface 102a 2). Preferably, the ratio of the second tooth portion 102a1 to the base portion 102a is between 0.10 and 0.50(y direction). A plurality of teeth (preferably, the distance between two adjacent teeth is 0.1mm to 1.0mm, such as 0.1mm, 0.2mm, 0.5mm, 0.6mm, 1.0mm, etc., so that the yoke gap L from the end face 102a2 to the bottom of the slot can be inserted into the slot by adjusting the number of the y-direction moving teeth, and the inner diameter of the stator assembly can be precisely adjusted) are arranged in the second tooth portion 102a 1.

In one embodiment, at least one side surface portion in the y direction of the base portion 102a is provided with the second tooth portion 102a 1. Preferably, the second tooth portion 102a1 extends from the side near the end face 102a2 to the middle region of the side of the base portion. And at least one side part in the circumferential direction of the groove is provided with a first tooth part matched with the second tooth part.

As shown in fig. 4 and 5, the stator yoke according to the embodiment of the present invention has a plurality of slots 101a arranged in the inner circumferential direction, and first tooth portions 101a1 are arranged on the circumferential side walls of the slots, respectively. The included angle between the connecting line of the two ends of the groove and the circle center is 5-30 degrees, preferably 10 degrees and 15 degrees.

In one embodiment, a first tooth portion 101a1 is disposed on a circumferential side wall of the slot. In the present embodiment, 9 slots are arranged in the stator yoke. In other embodiments, the number of slots is not limited, depending on the application. The design has the advantages that a plurality of grooves can be preset, the number of the stator teeth can be different from that of the grooves, and the requirement for various rapid mass production of the stator assembly is met. Preferably, the stator yoke has a plurality of protrusions or recesses uniformly arranged in the circumferential direction on the outer side. Further, the sum of the convex and concave portions corresponds to the number of the grooves. Further, the groove faces the convex portion or the concave portion. The ratio of the length of the convex part or the concave part in the circumferential direction of the stator to the slot is 0.1-1. Preferably, the ratio of the length of the circumferential convex or concave part of the stator to the slot is 0.2-0.5. The convex portion coincides with the center in the circumferential direction of the concave portion and the center in the circumferential direction of the groove. In one embodiment, the protrusion or recess is configured to provide a fixation when the motor is engaged with the tool.

The motor on which the stator assembly is mounted is a brushless motor, and can be used in electric tools such as lawn mowers, blowing and sucking machines, lawn mowers with self-driving function, hammer drills and the like.

The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and to implement the present invention, which cannot limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered by the protection scope of the present invention.

Claims

1. A motor for an electric tool with an adjustable stator inner diameter is characterized by comprising a stator component and a rotor component arranged in the stator component,

the stator assembly includes:

and a plurality of stator teeth including a base portion and a shoulder portion integrally formed therewith, wherein a second tooth portion is disposed on a side surface portion of the base portion, one side of the base portion is inserted into the slot, and at least a portion of the second tooth portion disposed on a side surface of the base portion is engaged with the first tooth portion.

2. The motor for a power tool with an adjustable inner diameter of a stator according to claim 1, wherein first teeth are provided on both sides of the slot; the two side surface parts of the base part are provided with second tooth parts, and one side of the base part is embedded into the groove, so that the second tooth parts are meshed with the first tooth parts.

3. The motor for a power tool with an adjustable inner diameter of a stator according to claim 2, wherein the second tooth portion is provided with a plurality of parallel protrusions at equal intervals.

4. The motor for a power tool in which the inner diameter of the stator is adjustable according to claim 3, wherein the projection is formed in a triangular shape or a square shape.

5. The motor for a power tool in which an inner diameter of a stator is adjustable according to claim 1, wherein 9 slots are uniformly arranged inside the stator yoke.

6. The motor for power tool with adjustable inner diameter of stator as claimed in claim 1, wherein the angle between the two ends of said shoulder is 5-30 °.

7. The motor for a power tool in which an inner diameter of a stator is adjustable according to claim 1, wherein the number of the slots is equal to or greater than the number of the stator teeth.

8. The motor for power tool with adjustable inner diameter of stator as claimed in claim 1, wherein the ratio of the length of the second tooth portion to the length of the base portion is 0.1-0.5.

9. The motor for electric tool with adjustable inner diameter of stator as claimed in claim 8, wherein said second tooth portion has a plurality of teeth therein, and the distance between two adjacent teeth is 0.1mm to 1.0 mm.

10. The motor for an electric tool with an adjustable inner diameter of a stator according to claim 1, wherein a plurality of protrusions or recesses are uniformly arranged on an outer side of the stator yoke in a circumferential direction, and a ratio of a length of the protrusion or recess to a length of the groove in the circumferential direction is 0.1 to 1.