CN216929707U

CN216929707U - Permanent magnet direct current motor

Info

Publication number: CN216929707U
Application number: CN202122619351.9U
Authority: CN
Inventors: 池瑞伟; 王向东
Original assignee: Zhejiang Ruiwei Mechanical And Electrical Technology Co ltd
Current assignee: Zhejiang Ruiwei Mechanical And Electrical Technology Co ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-07-08
Anticipated expiration: 2031-10-29

Abstract

The utility model discloses a permanent magnet direct current motor, which relates to the field of motors. The adjacent edges of the outer contour of the permanent magnet are transited in a sine function curve mode, so that the permanent magnet provides smoother magnetic flux density change, the torque change of the motor is smoother and smoother, larger torque fluctuation is avoided, click noise and vibration are favorably improved, and the service life of the motor is prolonged.

Description

Permanent magnet direct current motor

Technical Field

The utility model relates to the field of motors, in particular to a permanent magnet direct current motor.

Background

In the polygonal motor with a cross section shown in fig. 6, the circular arc curve of the corner part of the cross section is connected with two straight sides, and the circular arc curve is concentric with the center of the rotor. This shape, while making full use of the space of a specific cross-sectional thickness and width, has the following problems: the radial thickness of the permanent magnet changes suddenly at a corner and cannot be in smooth transition, so that the torque fluctuation of the motor is large during working, and the vibration and the noise of the motor are not reduced favorably.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problems, the utility model provides the permanent magnet direct current motor, and the adjacent edges of the outer contour of the permanent magnet are transited in a sine function curve mode, so that the permanent magnet provides smoother magnetic flux density change, the torque change of the motor is smoother and smoother, larger torque fluctuation is avoided, click noise and vibration are favorably improved, and the service life of the motor is prolonged.

The technical scheme adopted by the utility model for solving the technical problems is as follows: a permanent magnet direct current motor comprises a rotor, a permanent magnet and a shell, wherein the inner outline of the permanent magnet is circular, the shell is fixed on the inner wall of the shell, the overall outline of the permanent magnet is a regular polygon, and adjacent sides of the regular polygon are in peak transition through a sine function curve.

Because the inner contour of the permanent magnet is circular, and the adjacent edges of the outer contour of the permanent magnet are in curve transition through a sine function, the thickness of the whole permanent magnet can be in very smooth transition.

Preferably, the shell thickness is uniform and constant. So as to provide more uniform external mass and avoid abnormal vibration due to unbalance.

Preferably, the inner wall of the shell is adapted to the overall outer contour of the permanent magnet, and the outer wall of the permanent magnet is attached to the inner wall of the shell. In order to better secure the permanent magnets.

Preferably, the permanent magnet comprises a plurality of magnetic pole blocks, and each magnetic pole block is distributed at the adjacent included angle of the regular polygon. Better utilization of the internal space of the object and at the same time a smoother transition of the magnetic flux density can be provided.

Preferably, the function expression of the sine function curve is as follows:

x＝(0，B)。

by adopting the transition mode of the sine curve, more gentle torque change can be brought by the permanent magnet.

Preferably, the side length L, A of the regular polygon is greater than 0 and less than

B is greater than

And is less than L. By the above definition, the transition change can be controlled in a more gradual section.

The utility model has the beneficial effects that:

according to the scheme, the adjacent edges of the outer contour of the permanent magnet are transited in a sine function curve wave crest mode, so that the permanent magnet provides smoother magnetic flux density change, the torque change of the motor is smoother and smoother, larger torque fluctuation is avoided, click noise and vibration are improved, and the service life of the motor is prolonged.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments will be briefly introduced below, it is obvious that the drawings in the following description are only six of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic view of a four-corner motor according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the flux density variation of a four-corner motor according to an embodiment of the present invention;

FIG. 3 is a schematic view of a four-cornered permanent magnet and a housing of an embodiment of the utility model;

FIG. 4 is a graph comparing the variation of magnetic flux density for this embodiment of the utility model and for the prior art;

FIG. 5 is a schematic view of a motor with four or more corners according to an embodiment of the present invention;

FIG. 6 is a prior art schematic of an embodiment of the present invention;

the permanent magnet motor comprises a rotor 1, a permanent magnet 2, a shell 3 and a straight line section 4.

Detailed Description

For the purpose of enhancing the understanding of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and examples, which are provided for the purpose of illustration only and are not intended to limit the scope of the present invention.

Examples

As shown in fig. 1, a permanent magnet dc motor includes a rotor 1, a permanent magnet 2 having a circular inner contour, and a housing 3 having an inner wall fixing the permanent magnet 2, wherein the overall outer contour of the permanent magnet 2 is a regular polygon, and adjacent sides of the regular polygon are in sinusoidal transition. In fact, as shown in fig. 3, the final overall outer contour is not a regular polygon, but on the basis of the regular polygon, the adjacent edges are converted into corners by adopting the peaks of the sine function curve, and straight line segments 4 are adopted between the corners.

As shown in fig. 2 and 4, since the inner contour of the permanent magnet 2 is circular and the adjacent sides of the outer contour of the permanent magnet 2 are in curve transition by sine function, the thickness of the whole permanent magnet 2 can be in transition very smoothly.

The thickness of the shell 3 is uniform and constant. So as to provide more uniform external mass and avoid abnormal vibration due to unbalance.

The inner wall of the shell 3 is matched with the overall outline of the permanent magnet 2, and the outer wall of the permanent magnet is attached to the inner wall of the shell 3. In order to better secure the permanent magnet 2.

The permanent magnet 2 comprises a plurality of magnetic pole blocks, and each magnetic pole block is distributed at the included angle of the adjacent edges of the regular polygon. Better utilization of the internal space of the object and smoother transition of the magnetic flux density can be provided.

The function expression of the sine function curve is as follows:

x＝(0，B)。

The side length L and A of the regular polygon are greater than 0 and less than

B is greater than

The side length of the regular polygon is set to be greater than 0cm after the sine curve transition.

With reference to fig. 5, the present solution is also applicable to motors larger than a regular quadrilateral, and fig. 5 is a regular hexagon.

According to the scheme, the adjacent edges of the outer contour of the permanent magnet are transited in a sine function curve mode, so that the permanent magnet provides smoother magnetic flux density change, the torque change of the motor is smoother and smoother, larger torque fluctuation is avoided, click noise and vibration are favorably improved, and the service life of the motor is prolonged.

The above embodiments should not limit the present invention in any way, and all technical solutions obtained by using equivalent alternatives or equivalent transformations fall within the protection scope of the present invention.

Claims

1. A permanent magnet direct current motor comprises a rotor (1), a permanent magnet (2) with a circular inner contour and a shell (3) with an inner wall fixing the permanent magnet (2), and is characterized in that the overall outer contour of the permanent magnet (2) is a regular polygon, and adjacent sides of the regular polygon are in peak transition through a sine function curve.

2. A permanent magnet direct current motor according to claim 1, characterized in that: the thickness of the shell (3) is uniform and constant.

3. A permanent magnet direct current motor according to claim 1, characterized in that: the inner wall of the shell (3) is matched with the overall outer contour of the permanent magnet (2), and the outer wall of the permanent magnet is attached to the inner wall of the shell (3).

4. A permanent magnet direct current motor according to claim 1, characterized in that: the permanent magnet (2) comprises a plurality of magnetic pole blocks, and the magnetic pole blocks are distributed at the included angles of the adjacent edges of the regular polygon.

5. A permanent magnet direct current motor according to claim 1, characterized in that: the function expression of the sine function curve is as follows:

x＝(0，B)。

6. a permanent magnet direct current motor according to claim 5, characterized in that:

the side length L and A of the regular polygon are more than 0 and less than

B is greater than

And is less than L.