CN115149742A

CN115149742A - Motor and electric product

Info

Publication number: CN115149742A
Application number: CN202110346391.2A
Authority: CN
Inventors: 村上俊辅; 车红璐
Original assignee: Nidec Corp
Current assignee: Nidec Corp
Priority date: 2021-03-31
Filing date: 2021-03-31
Publication date: 2022-10-04
Also published as: JP2022158985A

Abstract

The embodiment of the application provides a motor and an electric product. The motor has: the motor comprises a rotor, a stator arranged opposite to the rotor in a radial direction, a bearing retainer arranged on one side of the rotor in the axial direction, a bus bar retainer arranged on one side of the bearing retainer in the axial direction, and a casing for accommodating the rotor, the stator, the bearing retainer and the bus bar retainer. Therefore, the Hall element is far away from the bus bar as far as possible, so that the electromagnetic interference generated on the Hall element by the bus bar under the condition of electrifying can be reduced, and the precision of the Hall element is improved.

Description

Motor and electric product

Technical Field

The embodiment of the application relates to the field of electromechanics, in particular to a motor and an electric product.

Background

In the conventional motor structure, the circuit board is located axially below the bus bar, and the hall element is provided on a side of the circuit board facing away from the bus bar.

It should be noted that the above background description is only for the convenience of clear and complete description of the technical solutions of the present application and for the understanding of those skilled in the art. Such solutions are not considered to be known to the person skilled in the art merely because they have been set forth in the background section of the present application.

Disclosure of Invention

The inventors have found that, in the conventional configuration, the hall element is positioned radially inward of the bus bar, and thus, the hall element is close to the bus bar, and when current is applied, electromagnetic interference generated from the bus bar affects the accuracy of the hall element, thereby deteriorating the accuracy of the hall element.

In order to solve the above problem, embodiments of the present application provide a motor and an electric product.

According to an aspect of embodiments of the present application, there is provided a motor having: a rotor, a stator arranged to be opposed to the rotor in a radial direction, a bearing holder positioned on one side in an axial direction of the rotor, a bus bar holder positioned on one side in the axial direction of the bearing holder, and a casing accommodating the rotor, the stator, the bearing holder, and the bus bar holder,

an induction magnet ring is arranged on the surface of one side of the bearing retainer facing the bus bar retainer,

a bus bar is enclosed in the bus bar holder, a circuit board is disposed on a surface of the bus bar holder facing the bearing holder, a hall element is disposed on a surface of the circuit board facing the bearing holder,

wherein the hall element and the bus bar are arranged in a radially displaced manner.

In some embodiments, the circuit board is axially between the induction magnet ring and the bus bar.

In some embodiments, the number of the bus bars is at least three, each of the bus bars is arranged in a circumferentially staggered manner with a gap left in the circumferential direction, and the hall element is arranged on the circuit board at a position facing the gap on one side surface of the bearing holder.

In some embodiments, the number of the bus bars is three, wherein the first bus bar is circumferentially displaced from the second bus bar and the third bus bar, the second bus bar and the third bus bar are partially overlapped in the axial direction, three bus bars are provided with a notch in the circumferential direction, and the hall element is arranged on the circuit board at a position facing the notch on one side surface of the bearing holder.

In some embodiments, the first bus bar has two connection terminals of a V end and a W end, the second bus bar has two connection terminals of a U end and a V end, and the third bus bar has two connection terminals of a W end and a U end; the gap is arranged between the V end of the first bus bar and the U end of the third bus bar, the W end of the first bus bar is adjacent to the U end of the second bus bar, and the V end of the second bus bar is adjacent to the W end of the third bus bar.

In some embodiments, the number of the hall elements is three, the three hall elements respectively correspond to a W pole, a U pole and a V pole of the coil, and the hall element corresponding to the W pole, the hall element corresponding to the V pole and the hall element corresponding to the U pole are arranged at positions corresponding to the notches counterclockwise along the circumferential direction.

In some embodiments, the three hall elements are arranged at a position radially inward of the circuit board away from the bus bar.

According to another aspect of the embodiments of the present application, an electrical product is provided, and the electrical product is provided with the motor according to any one of the embodiments.

One of the beneficial effects of the embodiment of the application lies in: according to the embodiment of the application, the Hall element is far away from the bus bar as far as possible, so that the electromagnetic interference on the Hall element caused by the bus bar under the condition of electrifying can be reduced, and the precision of the Hall element is improved.

Specific embodiments of the present application are disclosed in detail with reference to the following description and drawings, indicating the manner in which the principles of the application may be employed. It should be understood that the embodiments of the present application are not so limited in scope. The embodiments of the application include many variations, modifications and equivalents within the spirit and scope of the appended claims.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

FIG. 1 is a schematic view of one example of a motor of an embodiment of the present application;

FIG. 2 is a schematic view of the motor shown in FIG. 1 with the housing and the resin portion of the bus bar holder removed;

FIG. 3 is another schematic view of the motor shown in FIG. 1;

fig. 4 is a schematic view of the motor shown in fig. 1 after removing a resin portion of a bus bar holder.

Detailed Description

The foregoing and other features of the present application will become apparent from the following description, taken in conjunction with the accompanying drawings. In the description and drawings, particular embodiments of the application are disclosed in detail as being indicative of some of the embodiments in which the principles of the application may be employed, it being understood that the application is not limited to the described embodiments, but, on the contrary, is intended to cover all modifications, variations, and equivalents falling within the scope of the appended claims.

In embodiments of the present application, the term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprising," "including," "having," and the like, refer to the presence of stated features, elements, components, and do not preclude the presence or addition of one or more other features, elements, components, and elements.

In the embodiments of the present application, the singular forms "a", "an", and the like may include the plural forms and should be interpreted broadly as "a" or "an" and not limited to the meaning of "a" or "an"; furthermore, the term "comprising" should be understood to include both the singular and the plural, unless the context clearly dictates otherwise. Furthermore, the term "according to" should be understood as "according at least in part to \8230;" based on "should be understood as" based at least in part on \8230; "unless the context clearly indicates otherwise.

In addition, in the following description of the present application, a direction extending along the central axis O of the motor or a direction parallel thereto is referred to as an "axial direction" for convenience of description; a direction directed from the bottom of the motor case to the opening of the motor case is referred to as "upper" or "upper side" or "axially one side"; a direction directed from the opening of the motor case to the bottom of the motor case is referred to as "lower" or "lower side" or "axially other side"; a radial direction centered on the central axis O is referred to as a "radial direction"; the direction close to the central axis O is referred to as "radially inward"; the direction away from the central axis O is referred to as "radially outward"; the direction around the center axis O is referred to as "circumferential direction". It should be noted that these are for convenience of illustration only and do not limit the orientation of the motor during use and manufacture.

Embodiments of the present application will be described below with reference to the drawings.

Embodiments of the first aspect

The embodiment of the application provides a motor.

FIG. 1 is a schematic view of one example of a motor of an embodiment of the present application, showing the motor sectioned axially; fig. 2 is a schematic view of the motor shown in fig. 1 with the housing and the resin portion of the bus bar holder removed. As shown in fig. 1 and 2, the motor of the embodiment of the present application includes: the motor includes a rotor 10, a stator 20 arranged to face the rotor 10 in a radial direction, a bearing holder 30 positioned on one side in an axial direction of the rotor 10, a bus bar holder 40 positioned on one side in the axial direction of the bearing holder 30, and a substantially cylindrical casing 50 accommodating the rotor 10, the stator 20, the bearing holder 30, and the bus bar holder 40.

In the embodiment of the present application, as shown in fig. 1 and 2, the induction magnet ring M is disposed on one side surface (axially upper side surface) of the bearing holder 30 facing the bus bar holder 40, the bus bar 41 is enclosed in the bus bar holder 40, the circuit board 42 is disposed on one side surface (axially lower side surface) of the bus bar holder 40 facing the bearing holder 30, and the hall element H is disposed on one side surface (axially lower side surface) of the circuit board 42 facing the bearing holder 30.

In the embodiment of the present application, the hall elements H are arranged offset from the bus bars 41 in the radial direction. That is, as shown in fig. 2, the hall element H is not arranged at a position radially inward of the bus bar 41, but is arranged at a distance in the circumferential direction from the position radially inward of the bus bar 41. For example, the hall elements H are offset in the circumferential direction by a distance with respect to their original arrangement positions such that the hall elements H are no longer located radially inward of the bus bar 41. Thus, since the hall element H is as far as possible from the bus bar 41, when the bus bar 41 is energized, electromagnetic interference of the bus bar 41 to the hall element H is reduced, and the accuracy of the hall element H is improved.

The above structure of the motor is only exemplary, and the motor may also include other conventional components, such as the bearing 60, etc., and reference may be made to the related art.

In some embodiments, as shown in fig. 1, the circuit board 42 is located axially between the induction magnet ring M and the bus bar 41. Therefore, due to the fact that the space inside the motor is limited, the circuit board is arranged between the induction magnetic ring and the bus bar, electromagnetic interference of the bus bar to other electronic components arranged on the circuit board after the bus bar is electrified is reduced, and meanwhile the axial size of the motor is shortened.

FIG. 3 is another schematic view of the motor shown in FIG. 1, illustrating the motor as viewed from the axial upper side; fig. 4 is a schematic view of the motor shown in fig. 1 with a resin portion of a bus bar holder removed, showing a state of the motor viewed from the axial direction side, and showing the arrangement positions H' of the bus bars 41 and the hall elements H.

In some embodiments, as shown in fig. 2 and 4, the number of the bus bars 41 is at least three, each of the bus bars 41 is arranged offset in the circumferential direction with a gap G left in the circumferential direction, and the hall elements H are arranged on the circuit board 42 at positions facing the corresponding gaps G of one side surface (axially lower side surface) of the bearing holder 30.

For example, as shown in fig. 4, the number of the bus bars 41 is three, wherein the first bus bar 41-1 is arranged to be circumferentially displaced from the second bus bar 41-2 and the third bus bar 41-3, the second bus bar 41-2 and the third bus bar 41-3 are partially overlapped in the axial direction, the three bus bars 41 leave the notches G in the circumferential direction, and the hall elements H are arranged at positions on the circuit board 42 facing the notches G on one side surface (axially lower side surface) of the bearing holder 30.

This makes it possible to dispose the hall element H as far as possible from the bus bar 41, thereby further reducing electromagnetic interference with the hall element H when the bus bar 41 is energized, and improving the accuracy of the hall element H.

In some embodiments, as shown in fig. 4, the first bus bar 41-1 has two connection terminals of a V end and a W end, the second bus bar 41-2 has two connection terminals of a U end and a V end, and the third bus bar 41-3 has two connection terminals of a W end and a U end; a gap G is formed between the V end of the first bus bar 41-1 and the U end of the third bus bar 41-3, the W end of the first bus bar 41-1 is adjacent to the U end of the second bus bar 41-2, and the V end of the second bus bar 41-2 is adjacent to the W end of the third bus bar 41-3.

Thus, the above arrangement of the bus bar 41 can further reduce electromagnetic interference with the hall element H after the bus bar 41 is energized.

In some embodiments, as shown in fig. 4, there are three hall elements H, which correspond to the W pole, the U pole and the V pole of the coil, and are illustrated as Hw, hu and Hv in fig. 4, wherein the hall element Hw corresponding to the W pole, the hall element Hv corresponding to the V pole and the hall element Hu corresponding to the U pole are disposed counterclockwise in the circumferential direction at positions corresponding to the notches G.

Accordingly, the above arrangement of the hall elements H can further reduce electromagnetic interference with the hall elements H after the bus bar 41 is energized.

In some embodiments, as shown in fig. 1, the hall element H is disposed at a position radially inward of the circuit board 42 away from the bus bar 41. For example, as shown in fig. 4, the hall elements Hw, hu, and Hv are circumferentially in the same circumferential direction (i.e., the three hall elements are equally distant from the central axis O in the radial direction), and are circumferentially staggered away from the bus bar 41 in the radial direction.

Thus, the above arrangement of the hall elements H can further exhibit an effect of reducing electromagnetic interference with the hall elements H after the bus bar 41 is energized.

In the above embodiments, the hall elements H and the bus bar 41 are located in different circumferential directions (that is, the hall elements H are located radially inward with respect to the radial position of the bus bar 41) as an example, but the present application is not limited thereto, and for example, in some embodiments, the hall elements H and the bus bar 41 may be located in the same circumferential direction. That is, the hall element H is the same distance from the central axis O as the bus bar 41. Thus, since the hall element H is disposed in the notch G formed in the bus bar 41, the effect of reducing electromagnetic interference with the hall element H after the bus bar 41 is energized can be similarly exhibited.

It is to be noted that the above merely exemplifies the structure of the motor related to the present application, but the present application is not limited thereto, and appropriate modifications may be made on the basis of the above respective embodiments. In addition, the above is only an exemplary description of each component, but the present application is not limited thereto, and the specific content of each component may also refer to the related art; in addition, components not shown in fig. 1 to 4 may be added, or one or more components in fig. 1 to 4 may be reduced. Regarding other configurations and structures of the motor, reference may be made to the related art, and description thereof is omitted here.

According to the embodiment of the application, the Hall element is far away from the bus bar as far as possible, so that the electromagnetic interference on the Hall element generated by the bus bar under the condition of electrifying can be reduced, and the precision of the Hall element is improved.

Embodiments of the second aspect

The embodiments of the present application provide an electrical product, the electric product has the motor described in the embodiment of the first aspect. Since the structure of the motor has been described in detail in the embodiment of the first aspect, the contents thereof are incorporated herein, and the description thereof is omitted here.

In the embodiment of the present invention, the electric product may be any electric device provided with a motor, for example, an indoor unit of an air conditioner, an outdoor unit of an air conditioner, a water dispenser, a washing machine, a sweeper, a compressor, a blower, a mixer, or other household appliances, or an industrial device such as a pump, a conveyor, an elevator, a standard industrial universal machine, a wind power generator, a grinding machine, a traction motor, or various information processing devices, or may be various parts of an automobile, such as an automobile electric power steering system, an automobile sunroof adjusting part, a seat adjusting part, a transmission, a brake device, or the like.

The present application has been described in conjunction with specific embodiments, but it should be understood that these descriptions are exemplary and not intended to limit the scope of the present application. Various changes and modifications to this application, which will occur to those skilled in the art and which fall within the spirit and scope of this application, may be made by those skilled in the art based upon the teachings and principles herein.

Preferred embodiments of the present application are described above with reference to the accompanying drawings. The many features and advantages of the embodiments are apparent from the detailed specification, and thus, it is intended by the appended claims to cover all such features and advantages of the embodiments which fall within the true spirit and scope thereof. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the embodiments of the present application to the exact construction and operation illustrated and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope thereof.

Claims

1. A motor, comprising: a rotor, a stator disposed to be opposed to the rotor in a radial direction, a bearing holder located on one side in an axial direction of the rotor, a bus bar holder located on one side in the axial direction of the bearing holder, and a casing accommodating the rotor, the stator, the bearing holder, and the bus bar holder,

it is characterized in that the preparation method is characterized in that,

the hall element and the bus bar are arranged in a radially displaced manner.

2. The motor of claim 1,

the circuit board is located between the induction magnetic ring and the bus bar in the axial direction.

3. The motor of claim 1,

the number of the bus bars is at least three, each bus bar is arranged in a staggered mode in the circumferential direction, a gap is reserved in the circumferential direction, and the Hall element is arranged on the surface, facing the bearing retainer, of one side of the circuit board and corresponding to the position of the gap.

4. The motor of claim 1,

the number of the bus bars is three, wherein a first bus bar, a second bus bar and a third bus bar are arranged in a staggered mode in the circumferential direction, the second bus bar and the third bus bar are partially overlapped in the axial direction, gaps are reserved in the circumferential direction on the three bus bars, and the Hall element is arranged on the circuit board at a position, corresponding to the gaps, of one side surface, facing the bearing retainer.

5. The motor of claim 4,

the first bus bar has two connecting terminals of a V end and a W end, the second bus bar has two connecting terminals of a U end and a V end, the third bus bar has two connecting terminals of a W end and a U end,

the gap is arranged between the V end of the first bus bar and the U end of the third bus bar, the W end of the first bus bar is adjacent to the U end of the second bus bar, and the V end of the second bus bar is adjacent to the W end of the third bus bar.

6. The motor according to claim 5, wherein the number of the hall elements is three, and the three hall elements correspond to a W pole, a U pole, and a V pole of the coil, respectively, and the hall element corresponding to the W pole, the hall element corresponding to the V pole, and the hall element corresponding to the U pole are disposed counterclockwise in a circumferential direction at positions corresponding to the notches.

7. The motor of claim 6, wherein the three hall elements are arranged radially inward of the circuit board away from the bus bar.

8. An electrical product, characterized in that it comprises a motor according to any one of claims 1 to 7.