CN116566132A - Motor and electric product - Google Patents

Abstract

The invention provides a motor and an electric product. The motor includes a rotor including a rotor core, and a sensor assembly including an induction element and an induction target disposed in opposition, wherein the rotor further includes a resin located at least in a part of one axial side of the rotor core, and the induction target is fixed to the rotor by being embedded in the resin. Therefore, the assembly process of the motor can be simplified, the manufacturing cost can be reduced, and the axial dimension of the motor can be shortened.

Description

Motor and electric product

Technical Field

The invention relates to the field of motors, in particular to a motor and an electric product.

Background

The motor generally includes a rotor, a rotation shaft, a sensor assembly, and the like, by which the rotation position of the rotation shaft or the rotor of the motor is detected. The sensor assembly may include a sensing element and a sensing target. The induction element is usually mounted on a circuit board, and the induction target is usually fixed to the rotating shaft by interference fit with the rotating shaft or fixed to the rotor core of the rotor by interference fit.

It should be noted that the foregoing description of the background art is only for the purpose of providing a clear and complete description of the technical solution of the present invention and is presented for the convenience of understanding by those skilled in the art. The above-described solutions are not considered to be known to the person skilled in the art simply because they are set forth in the background of the invention section.

Disclosure of Invention

The inventors have found that, in the conventional motor, when the induction target is fixed by the above method, the assembly process is complicated. In addition, when the induction target is fixed to the rotary shaft or the rotor core by interference fit, a portion of the induction target to which the rotary shaft or the rotor core is interference fit needs to be extended by a predetermined length in the axial direction, which leads to an increase in the axial dimension of the motor.

In order to solve at least one of the above problems or other similar problems, embodiments of the present invention provide a motor and an electrical product, which can facilitate simplifying the assembly process of the motor, reducing the manufacturing cost, and shortening the axial dimension of the motor.

According to a first aspect of an embodiment of the present invention, there is provided a motor including a rotor core, and a sensor assembly including an induction element and an induction target which are arranged to be opposed to each other, wherein the rotor further includes a resin at least a part of one side in an axial direction of the rotor core, and the induction target is fixed to the rotor by being buried in the resin.

According to a second aspect of an embodiment of the present invention, there is provided an electrical product comprising the motor of the first aspect.

One of the beneficial effects of the embodiment of the invention is that: the rotor of the motor includes a resin at least at a part of one side in the axial direction of the rotor core, and the induction object is fixed to the rotor by embedding the resin, so that the assembly process of the motor can be simplified, the manufacturing cost can be reduced, and the axial dimension of the motor can be shortened.

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

Features that are described and/or illustrated with respect to one embodiment may be used in the same way or in a similar way in one or more other embodiments in combination with or instead of the features of the other embodiments.

Drawings

The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention. It is evident that the drawings in the following description are only some embodiments of the present invention and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:

FIG. 1 is a cross-sectional view of a portion of a motor according to an embodiment of the first aspect of the present invention;

FIG. 2 is a cross-sectional view of a motor of an embodiment of the first aspect of the present invention;

fig. 3 is a schematic view of an induction target according to an embodiment of the first aspect of the present invention;

fig. 4 is a schematic view of another angle of the sensing target according to the embodiment of the first aspect of the invention;

FIG. 5 is another schematic illustration of a motor of an embodiment of the first aspect of the present invention;

FIG. 6 is another schematic illustration of a motor of an embodiment of the first aspect of the present invention;

FIG. 7 is a schematic view of a rotor and a sensing target according to an embodiment of the first aspect of the present invention;

fig. 8 is a cross-sectional view of a rotor and a sensing target according to an embodiment of the first aspect of the present invention;

fig. 9 is a schematic view of a rotor of an embodiment of the first aspect of the invention.

Detailed Description

The foregoing and other features of the invention will become apparent from the following description, taken in conjunction with the accompanying drawings. In the specification and drawings, there have been specifically disclosed specific embodiments of the invention that are indicative of some of the embodiments in which the principles of the invention may be employed, it being understood that the invention 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 the drawings used in the following description, the components are made to be distinguishable on the drawing, and therefore, the scale differs for each component, and the present invention is not limited to the number of components, the shape of the components, the scale of the size of the components, and the relative positional relationship of the components described in these drawings.

In the embodiments of the present invention, the terms "first," "second," and the like are used to distinguish between different elements from each other by name, but do not indicate spatial arrangement or time sequence of the elements, and the elements should not be limited by the terms. The term "and/or" includes any and all combinations of one or more of the associated listed terms. The terms "comprises," "comprising," "including," "having," and the like, are intended to reference the presence of stated features, elements, components, or groups of components, but do not preclude the presence or addition of one or more other features, elements, components, or groups of components.

In embodiments of the present invention, the singular forms "a," an, "and" the "include plural referents and should be construed broadly to mean" one "or" one type "and not limited to" one "or" another; furthermore, the term "comprising" is to be interpreted as including both the singular and the plural, unless the context clearly dictates otherwise. Furthermore, the term "according to" should be understood as "at least partially according to … …", and the term "based on" should be understood as "based at least partially on … …", unless the context clearly indicates otherwise.

In the embodiment of the present invention, a direction extending along or parallel to the central axis of the motor is referred to as an "axial direction", a radial direction centered on the central axis is referred to as a "radial direction", and a direction around the central axis is referred to as a "circumferential direction". It should be noted that the definition of each direction in this specification is only for the convenience of illustrating the embodiments of the present invention, and does not limit the direction of the motor or the like in use and manufacture.

Example of the first aspect

An embodiment of the first aspect of the present invention provides a motor, fig. 1 is a cross-sectional view of part of a motor 100 of an embodiment of the first aspect of the present invention, and fig. 2 is a cross-sectional view of a motor 100 of an embodiment of the first aspect of the present invention. In at least one embodiment, as shown in fig. 1 and 2, the motor 100 includes a rotor 1 and a sensor assembly 2. The rotor 1 includes a rotor core 11, and a resin 12 located at least in a part of one side in the axial direction of the rotor core 11. The sensor unit 2 includes a sensing element 21 and a sensing target 22 disposed to face each other, and the sensing target 22 is fixed to the rotor 1 by embedding the resin 12 therein.

According to the above embodiment, the rotor 1 of the motor 100 includes the resin 12 located at least a part of the axial side of the rotor core 11, and by embedding the induction object 22 in the resin 12 to be fixed to the rotor 1, it is possible to facilitate simplification of the assembly process of the motor 100 and reduction of the manufacturing cost; further, since the induction target 22 does not need to be interference-fitted with the rotary shaft or the rotor core 11 in the axial direction, the axial dimension of the motor 100 can be shortened.

In at least one embodiment, as shown in fig. 2, the motor 100 may further include a stator 3. The stator 3 may include a stator core and coil windings wound on the stator core. In at least one embodiment, as shown in fig. 2, the motor 100 may be an inner rotor type motor, for example, the rotor 1 is located radially inward of the stator 3. However, the present application is not limited thereto, and the motor 100 may be other types of motors. For example, the motor 100 may be an outer rotor type motor, for example, the rotor 1 is located radially outside the stator 3; alternatively, the motor 100 may be an axial flux motor, for example, in which the rotor 1 and the stator 3 are disposed to face each other in the axial direction, or the like.

In at least one embodiment, as shown in fig. 2, the motor 100 may further include: the housing 4, the rotation shaft 5, the bearing 6, the bearing holder 7, and the like. The housing 4 accommodates the rotor 1, the sensor assembly 2, the stator 3, the rotation shaft 5, the bearing 6, the bearing holder 7, and the like. The bearing holder 7 may cover the opening of the housing 4 and support the bearing 6. The bearing 6 can support the rotation shaft 5 to rotate along the central axis OO'.

In at least one embodiment, bearings 6 may be provided at both ends of the rotation shaft 5 in the axial direction, respectively, whereby the rotation shaft 5 can be more reliably held, and the rotation accuracy of the rotation shaft 5 can be improved. However, the present application is not limited to this, and the bearing 6 may be provided at one axial end or the other axial end of the rotary shaft 5, whereby the number of components of the motor 100 can be reduced.

In at least one embodiment, the bearing 6 may be various members capable of supporting the rotation shaft 5 for rotation, for example, it may be a sliding bearing, a rolling bearing, or the like.

In at least one embodiment, the inductive element 21 may be mounted on a circuit board, which may be provided on the bearing holder 7. For example, as shown in fig. 2, the circuit board may be fixed to the surface 7a of the other axial side of the bearing holder 7 by a resin member 8. However, the present application is not limited thereto, and the circuit board may be fixed to the bearing holder 7 by another member, directly to the bearing holder 7, or by another member.

In some embodiments, as shown in fig. 2, an end surface 7b of the bearing holder 7 on the other axial side of the bearing 6 may be opposed to the resin 12. Since no other member is provided between the bearing holder 7 and the resin 12, the axial dimension of the motor 100 can be further reduced.

In at least one embodiment, the sensing target 22 is fixed to the rotor 1, whereby the rotor 1 can rotate the sensing target 22. By generating a relative motion between the sensing target 22 and the sensing element 21, the rotational position of the rotor 1 or the rotary shaft 5 can be determined by the sensor unit 2, and the rotational state of the rotor 1 or the rotary shaft 5 can be detected.

In at least one embodiment, the sensor assembly 2 may be of various types. For example, the sensor assembly 2 may be an inductance sensor assembly, in which the sensing element 21 may include an inductance coil, for example, and the sensing target 22 may be a metal sensing bracket, and the magnitude and direction of the displacement amount of the sensing target 22 can be determined by measuring the change in inductance value in the inductance coil. For another example, the sensor assembly 2 may be an assembly that senses by using the hall effect, wherein the sensing element 21 may be an induction coil, for example, and the sensing target 22 may be an induction magnetic ring.

In some embodiments, the resin 12 of the rotor 1 may cover the entirety of the surface of the axial side of the rotor core 11, or may cover a part of the surface of the axial side of the rotor core 11.

Fig. 3 is a schematic view of the sensing target 22 according to the embodiment of the first aspect of the present invention, fig. 4 is a schematic view of another angle of the sensing target 22 according to the embodiment of the first aspect of the present invention, and fig. 5 is another schematic view of the motor 100 according to the embodiment of the first aspect of the present invention. As shown in fig. 1, 3 to 5, the sensing target 22 may include a sensing portion 221 opposed to the sensing element 21, a connecting portion 222 connected to the sensing portion 221 and extending in a direction forming a prescribed angle α (shown in fig. 5) with the axial direction, and an embedding portion 223 connected to the connecting portion 222 and embedding the resin 12, wherein the prescribed angle α may be an angle of greater than or equal to 0 ° and less than 90 °.

For example, as shown in fig. 1, the connection portion 222 may extend in the axial direction (i.e., the prescribed angle α is 0 °). Thereby, the radial dimension of the induction target 22 can be reduced as much as possible while ensuring the radially extended length of the induction section 221. As another example, as shown in fig. 5, the connection portion 222 may extend in a direction that is at an acute angle to the axial direction (i.e., a prescribed angle is greater than 0 ° and less than 90 °). Thus, the sensing portion 221 can be provided at a position opposed to the sensing element 21 by adjusting the magnitude of the predetermined angle α.

In some embodiments, as shown in fig. 3 and 4, in the sensing target member 22, only the connection portion 222 extends in a direction at a prescribed angle from the axial direction. In other words, only the connection portion 222 has an extension component in the axial direction. Thereby, the axial dimension of the induction target 22 can be shortened, and thus the axial dimension of the motor 100 can be further reduced. However, the present application is not limited to this, and other portions having an extension component in the axial direction may be provided in the sensing target 22.

In some embodiments, as shown in fig. 3 and 4, the sensing part 221 may include more than 2 protruding structures 221a extending in a radial direction from the connection part 222 and uniformly distributed in a circumferential direction. As a result, the magnetic lines of force of the induction element 21 can be cut by the protruding structures 221a provided at intervals in the circumferential direction, whereby a change in current can be induced in the induction element 21, and the rotation state of the rotor 1 or the rotary shaft 5 can be determined from the change.

In some embodiments, as shown in fig. 3 and 4, the sensing part 221 may include 5 protruding structures 221a, but the present application is not limited thereto and other numbers of protruding structures may be provided.

In some embodiments, as shown in fig. 3 and 4, the end 221b of one circumferential side and the end 221c of the other circumferential side of the protruding structure 221a may extend in a radial direction, in other words, the protruding structure 221a may have a substantially fan shape. This can improve the sensitivity of electromagnetic induction. However, the present application is not limited thereto, and the end 221b on one side in the circumferential direction and the end 221c on the other side in the circumferential direction of the protruding structure 221a may extend in other directions.

In some embodiments, as shown in fig. 3 and 4, the sensing portion 221 and the buried portion 223 extend in different directions in a radial direction with respect to the connection portion 221. The molding of the induction object 22 can be facilitated as compared with a case where the induction portion 221 and the embedded portion 223 are overlapped as viewed in the axial direction.

In some embodiments, as shown in fig. 3 and 4, the junction of the embedded portion 223 and the connection portion 222 of the induction target 2 may be provided with an arc-shaped chamfer. This can increase the area of the junction between the embedded portion 223 and the connection portion 222, and can increase the strength of the sensing target 2. However, the present application is not limited thereto, and the junction of the embedded portion 223 and the connection portion 222 may be provided with a chamfer of another shape or may not be provided with a chamfer.

In some embodiments, as shown in fig. 4, the sensing portion 221 of the sensing target 2 may further include a step 221d, and the protruding structure 221a protrudes from an end of the radial outside of the step 221d. This can improve the strength of the sensing target 2. However, the present application is not limited thereto, and the sensing portion 221 may not be provided with the step 221d.

In some embodiments, as shown in fig. 1 and 2, the sensing element 21 and the sensing target 22 in the sensor assembly 2 may be arranged to be axially opposed. However, the present application is not limited to this, and the sensing element 21 and the sensing target 22 may be arranged to face each other in other directions, for example, may be arranged to face each other in the radial direction.

Fig. 6 is another schematic diagram of a motor 100 according to an embodiment of the first aspect of the invention. As shown in fig. 6, the sensing target 22' may include a sensing portion 221' facing the sensing element 21 and extending in a direction at a prescribed angle β from the axial direction, and an embedded portion 223 connected to the sensing portion 221' and embedded with 12 resin, the prescribed angle β being greater than or equal to 0 ° and less than 90 °.

In some embodiments, as shown in fig. 6, the sensing portion 221 'may extend in a direction at an acute angle to the axial direction, but the present application is not limited thereto, and the sensing portion 221' may extend in the axial direction (i.e., the prescribed angle β is 0 °).

In some embodiments, as shown in fig. 6, the sensing element 21 may be provided on the bearing support 7, for example, at a portion of the bearing support 7 extending in the axial direction, thereby being capable of being radially opposed to the sensing portion 221 'of the sensing target 22'.

In some embodiments, as shown in fig. 6, in the sensing target member 22', only the sensing portion 221' extends in a direction at a prescribed angle from the axial direction. In other words, only the sensing portion 221' has an extension component in the axial direction. Thereby, the axial dimension of the induction target 22' can be shortened, and thus the axial dimension of the motor 100 can be further reduced. However, the present application is not limited to this, and other portions having an extension component in the axial direction may be provided in the sensing target 22'.

In some embodiments, the sensing portion 221' may include more than 2 protruding structures uniformly distributed in the circumferential direction extending from the embedded portion 223 in a direction at a prescribed angle β from the axial direction. In this way, the magnetic lines of force of the induction element 21 can be cut by the protruding structures provided at intervals in the circumferential direction, whereby a change in current can be caused in the induction element 21, and the rotation state of the rotor 1 or the rotary shaft 5 can be determined from the change.

In some embodiments, the extension direction of the circumferential one-side end and the circumferential other-side end of the protruding structure of the sensing portion 221' may be perpendicular to a tangential line of the circumferential direction, in other words, the protruding structure may have a substantially rectangular shape. This can improve the sensitivity of electromagnetic induction. However, the present application is not limited thereto, and the end portion on one side in the circumferential direction and the end portion on the other side in the circumferential direction of the protruding structure of the sensing portion 221' may also extend in other directions.

In some embodiments, as shown in fig. 1, 5, and 6, the embedded portion 223 may extend in the radial direction and be disposed on a surface of one side in the axial direction of the rotor core 11. Since the embedded portion 223 is disposed against the surface of the rotor core 11, the axial dimension of the motor 100 can be further shortened. However, the present application is not limited to this, and the resin 12 or other members may be interposed between the embedded portion 223 and the surface of the rotor core 11 on one side in the axial direction.

In some embodiments, as shown in fig. 1, 5, and 6, the embedded portion 223 may extend radially with a radially inner end 223a that is radially outward of the radially inner end 12a of the resin 12. Thus, the resin 12 can cover the radially inner end 223a of the embedded portion 223, and the resin 12 of the radially inner end 223a of the embedded portion 223 can be prevented from being broken, so that the sensing target 2 can be reliably fixed. However, the present application is not limited to this, and the radially inner end 223a of the embedded portion 223 may be flush with the radially inner end 12a of the resin 12, so that the area of the embedded portion 223 can be increased, and the sensing target 2 can be reliably fixed.

In some embodiments, as shown in fig. 1, 5, and 6, the radially inner end 12a of the resin 12 does not exceed the shaft hole 11a of the rotor core 11. Thereby, the resin 12 does not interfere with the rotation shaft 5 located in the shaft hole 11a. For example, as shown in fig. 1, 5, and 6, the radial inner end 12a of the resin 12 is positioned radially outside the shaft hole 11a of the rotor core 11, whereby the requirements for the manufacturing process of the motor 100 can be reduced.

Fig. 7 is a schematic view of a rotor 1 and a sensing target 22 according to an embodiment of the first aspect of the present invention, fig. 8 is a cross-sectional view of a rotor 1 and a sensing target 22 according to an embodiment of the first aspect of the present invention, and fig. 9 is a schematic view of a rotor 1 according to an embodiment of the first aspect of the present invention. In some embodiments, as shown in fig. 7-9, the axial thickness of the portion 12a of the resin 12 covering the embedded portion 223 is greater than the axial thickness of the other portion 12b of the resin 12. This can ensure the reliability of fixing the sensing target 2 to the resin 12, and can reduce the amount of the resin 12. However, the present application is not limited thereto, and the axial thickness of the portion 12a of the resin 12 covering the embedded portion 223 may also be equal to or smaller than the axial thickness of the other portion 12b of the resin 12.

In some embodiments, the inductive object 22 may be made of a metallic material. For example, it may be made from sus 304. This can improve the sensitivity of electromagnetic induction.

In some embodiments, the rotor 1 may be a spoke (spoke) rotor. Since the spoke rotor itself is provided with the resin 12 on one side in the axial direction of the rotor core 11, the induction object 22 can be directly fixed by the resin 12 of the spoke rotor itself, and an additional resin structure for molding is not required. However, the present application is not limited thereto, and the rotor 1 may be another type of rotor.

In some embodiments, the sensing object may extend in a radial direction with its radial end embedded in resin. Thereby, the axial dimension of the induction target can be further reduced. For example, an induction magnet ring extending in the circumferential direction may be provided on an axial-direction-side surface of a radially outer portion of the induction target, and the induction magnet ring may protrude from an axial-direction-side surface of the resin so as to be axially opposed to the induction element (e.g., induction coil); the resin is embedded in the radial inner part of the induction object. By providing the induction magnet ring at a portion radially outside the induction target, the area of the induction magnet ring can be increased, and the induction sensitivity can be improved. However, the present application is not limited to this, and the induction magnet ring may be arranged to sense a portion of the object on the inner side in the radial direction, and a portion of the object on the outer side in the radial direction may be embedded in the resin.

Note that, the structure of the motor 100 related to the present invention is described above, and the description thereof is omitted here with reference to the related art for other structures of the motor 100.

According to the above embodiment, the rotor of the motor includes the resin at least at a part of one side in the axial direction of the rotor core, and the induction object is fixed to the rotor by embedding the resin, so that it is possible to advantageously simplify the assembly process of the motor, reduce the manufacturing cost, and shorten the axial dimension of the motor.

Embodiments of the second aspect

The present embodiment provides an electrical product including the motor 100 according to the embodiment of the first aspect, and since the structure of the motor has been described in the embodiment of the first aspect, the content thereof is incorporated herein and will not be described herein.

With the electric product of the present embodiment, since the structure of the motor according to the embodiment of the first aspect is adopted, the rotor of the motor includes the resin at least at a part of one side in the axial direction of the rotor core, and the induction object is fixed to the rotor by embedding the resin, it is possible to facilitate simplification of the assembly process of the motor, reduction of the manufacturing cost, and shortening of the axial dimension of the motor.

In the present embodiment, the electric product may be any electric product using a motor, for example, may be a household appliance, such as a sweeper, or the like; consumer electronics, computer products, various office automation equipment, medical equipment, transportation equipment, vehicle-mounted products, and the like.

While the invention has been described in connection with specific embodiments, it will be apparent to those skilled in the art that the description is intended to be illustrative and not limiting in scope. Various modifications and alterations of this invention will occur to those skilled in the art in light of the spirit and principles of this invention, and such modifications and alterations are also within the scope of this invention.

Claims (11)

1. A motor comprising a rotor including a rotor core, and a sensor assembly including an induction element and an induction target arranged in opposition to each other, characterized in that,

the rotor further includes a resin positioned on at least a part of one axial side of the rotor core, and the induction target is fixed to the rotor by embedding the resin therein.

2. The motor according to claim 1, wherein,

the induction target includes an induction portion opposed to the induction element, a connection portion connected to the induction portion and extending in a direction forming a prescribed angle with an axial direction, and an embedding portion connected to the connection portion and embedding the resin, the prescribed angle being greater than or equal to 0 ° and less than 90 °.

3. The motor according to claim 2, wherein,

the sensing portion includes 2 or more protruding structures extending in a radial direction from the connection portion and uniformly distributed in a circumferential direction, and the sensing portion and the embedded portion extend in different directions in a radial direction with respect to the connection portion.

4. The motor according to claim 1, wherein,

the induction target includes an induction portion opposed to the induction element and extending in a direction forming a prescribed angle with an axial direction, and an embedded portion connected to the induction portion and embedded in the resin, the prescribed angle being greater than or equal to 0 DEG and less than 90 deg.

5. The motor according to claim 2 or 4, wherein,

the embedded portion extends in the radial direction and is disposed on one axial surface of the rotor core.

6. The motor according to claim 2 or 4, wherein,

the embedded portion extends in the radial direction with a radially inner end portion thereof being radially outer than a radially inner end portion of the resin.

7. The motor according to claim 2 or 4, wherein,

the axial thickness of the resin covering the embedded portion is greater than the axial thickness of the other portions of the resin.

8. The motor according to claim 1, wherein,

the rotor is a spoke type rotor.

9. The motor of claim 1, further comprising:

and a bearing holder that supports a bearing of the motor, wherein an end surface of the bearing holder on the other axial side of the bearing faces the resin.

10. The motor according to claim 1, wherein,

the sensing object extends in the radial direction, and the resin is embedded in the radial end portion thereof.

11. An electric product, characterized in that it comprises the motor according to any one of claims 1 to 10.