CN215897407U

CN215897407U - Motor and rotor thereof

Info

Publication number: CN215897407U
Application number: CN202121667637.8U
Authority: CN
Inventors: 廖国洪
Original assignee: Shenzhen Topband Co Ltd
Current assignee: Shenzhen Topband Co Ltd
Priority date: 2021-07-21
Filing date: 2021-07-21
Publication date: 2022-02-22
Anticipated expiration: 2031-07-21

Abstract

The invention provides a motor rotor, which comprises a rotor core, a permanent magnet, a rotating shaft and a metal shell, wherein the rotating shaft is in sealed connection with the metal shell through seamless welding; the metal shell comprises a metal sheath and a metal end cover, at least one of two axial ends of the metal sheath is open, and the metal end cover and the metal sheath are connected in a sealing mode through welding so that the rotor core and the permanent magnet are sealed in the metal shell. The invention also provides a motor which comprises a motor stator and the motor rotor in running fit with the motor stator. The motor and the rotor thereof have the advantages that due to the adoption of the motor rotor structure, the waterproof, dustproof, anti-corrosion and other performances of the rotor are greatly improved, and the motor can be used in a severe working environment.

Description

Motor and rotor thereof

Technical Field

The invention relates to the technical field of motors, in particular to a motor and a rotor thereof.

Background

The rotor is an important component of an electric machine (i.e., an electric motor) that converts electrical energy into mechanical energy for rotation of the rotor.

At present, the working conditions of many motors are severe, for example, the motors are in high temperature, high pressure, closed environment or soaked in liquid for a long time, and generally, in order to bear the severe environmental conditions, the outer surface of the rotor is integrally coated with an iron core and a permanent magnet by adopting a plastic shell, and the defects are that: the shell of the rotor is formed by plastic, and the rotor is easy to crack, bulge and the like when operating under severe environmental conditions such as high temperature, high pressure, closed environment or long-term immersion liquid, so that the motor is blocked and burnt.

Disclosure of Invention

The present invention is directed to a motor and a rotor thereof, which address the above-mentioned shortcomings in the related art.

The technical scheme adopted by the invention for solving the technical problem comprises the following steps: the motor rotor capable of bearing severe environmental conditions comprises a rotor core, a permanent magnet and a rotating shaft, wherein the permanent magnet is arranged on the rotor core, the motor rotor further comprises a metal casing, the rotating shaft penetrates through the rotor core and is fixed with the rotor core, the rotor core and the permanent magnet are arranged in the metal sheath, and two ends of the rotating shaft extend out of two axial ends of the metal casing;

the rotating shaft and the metal shell are in sealed connection through seamless welding;

the metal shell comprises a metal sheath and a metal end cover, at least one of two axial ends of the metal sheath is open, the metal end cover covers the open end of the metal sheath and is in sealed connection with the metal sheath through welding, and therefore the rotor core and the permanent magnet are sealed in the metal shell.

Preferably, two axial ends of the metal sheath are open, the metal end covers comprise two metal end covers, the two metal end covers respectively cover the two open ends of the metal sheath and are in sealed connection with the metal sheath through seamless welding, two ends of the rotating shaft respectively penetrate through the two metal end covers and extend outwards, and the metal end covers are in sealed connection with the rotating shaft through seamless welding.

Preferably, the metal sheath and the metal end cap are of a non-magnetically permeable metal material.

Preferably, the rotor core is provided with axially through holes for reducing the mass of the rotor core, and the through holes comprise at least two through holes uniformly distributed around the rotating shaft.

Preferably, the outer diameter of the rotor core housing the permanent magnets corresponds to the inner diameter of the metal sheath.

Preferably, a permanent magnet mounting concave position is arranged on the side surface of the rotor core, the permanent magnet is arc-shaped, and a concave surface facing the rotor core is arranged in the permanent magnet mounting concave position so that the permanent magnet can be mounted on the side surface of the rotor core;

the corner of the concave position of the permanent magnet installation is provided with an anti-demagnetization groove which extends axially and is used for enabling the permanent magnet to resist demagnetization, and the position of the anti-demagnetization groove corresponds to the corner of the permanent magnet.

Preferably, the demagnetization-resistant grooves are formed at corners of both ends of the permanent magnet mounting recess in the circumferential direction.

Preferably, an axially-opened permanent magnet mounting groove is formed in the rotor core, and the permanent magnet is embedded into the permanent magnet mounting groove and is mounted in the rotor core in an embedded mode.

Preferably, the metal end cover comprises a main body part covering the end face of the rotor core and a cladding part extending axially outwards and cladding the side face of the rotating shaft.

The technical scheme adopted by the invention for solving the technical problem comprises the following steps: the motor comprises a motor stator and the motor rotor which is in running fit with the motor stator.

The technical scheme of the invention at least has the following beneficial effects: the motor and the rotor thereof have the advantages that due to the adoption of the motor rotor structure, the waterproof, dustproof, anti-corrosion and other performances of the rotor are greatly improved, and the motor can be used in a severe working environment.

Drawings

The invention will be further described with reference to the accompanying drawings and examples, in which:

fig. 1 is a front projection view of a rotor of an electric machine according to an embodiment of the present invention.

Fig. 2 is a sectional view taken at a position a-a in fig. 1.

Fig. 3 is a front projection view of the rotor core in fig. 2.

Fig. 4 is a cross-sectional view taken at the position B-B in fig. 1.

Fig. 5 is a front projection view of a rotor of an electric machine according to another embodiment of the present invention.

Fig. 6 is a cross-sectional view at the position C-C in fig. 5.

Fig. 7 is a front projection view of the rotor core in fig. 6.

Fig. 8 is a cross-sectional view taken at the position D-D in fig. 5.

The reference numerals in the figures denote: the permanent magnet rotor comprises a metal shell 1, a metal sheath 11, a metal end cover 12, a main body part 121, a coating part 122, a rotating shaft 3, a reinforcing part 31, a rotor core 4, a through hole 41, a permanent magnet installation concave part 42, an anti-demagnetization groove 43, a permanent magnet installation groove 44 and a permanent magnet 5.

Detailed Description

For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that if the terms "front", "back", "upper", "lower", "left", "right", "longitudinal", "lateral", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are used herein to indicate an orientation or positional relationship, they are constructed and operated in a specific orientation based on the orientation or positional relationship shown in the drawings, which is for convenience of describing the present invention, and do not indicate that the device or component being referred to must have a specific orientation, and thus, should not be construed as limiting the present invention. It is also to be understood that, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," "disposed," and the like, if used herein, are intended to be inclusive, e.g., that they may be fixedly connected, detachably connected, or integrally formed; either directly or indirectly through intervening media, either internally or in any other relationship. When an element is referred to as being "on" or "under" another element, it can be "directly" or "indirectly" on the other element or intervening elements may also be present. If the terms "first", "second", "third", etc. are used herein only for convenience in describing the present technical solution, they are not to be taken as indicating or implying relative importance or implicitly indicating the number of technical features indicated, whereby the features defined as "first", "second", "third", etc. may explicitly or implicitly include one or more of such features. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.

Referring to fig. 1 to 4, a motor rotor according to an embodiment of the present invention includes a rotor core 4, a permanent magnet 5, and a rotating shaft 3, wherein the permanent magnet 5 is mounted on the rotor core 4, and further includes a metal casing 1, the rotating shaft 3 penetrates through the rotor core 4 and is fixed to the rotor core 4, the rotor core 4 and the permanent magnet 5 are disposed in a metal sheath 11, and two ends of the rotating shaft 3 extend out from two axial ends of the metal casing 1;

the rotating shaft 3 and the metal shell 1 are in sealed connection through seamless welding;

the metal shell 1 includes a metal sheath 11 and a metal end cover 12, at least one of two axial ends of the metal sheath 11 is open, and the metal end cover 12 covers the open end of the metal sheath 11 and is connected with the metal sheath 11 in a sealing manner by welding, so as to seal the rotor core 4 and the permanent magnet 5 in the metal shell 1.

The welding is preferably laser welding.

This electric motor rotor has profitable technological effect owing to adopt above-mentioned structure:

the performance of the rotor such as water resistance, dust prevention and corrosion prevention is greatly improved, the protection level can reach IP67 or above, the rotor can bear high temperature, high pressure, closed environment and severe working environment of long-term soaking liquid, the performance of the motor is improved, the noise of the motor is reduced, the service life of the motor is prolonged, and therefore the market competitiveness is improved.

For example, the working environment of the water pump motor rotor is relatively severe, and the water pump motor rotor runs under severe environmental conditions such as high temperature, high pressure, closed environment and long-term immersion in liquid, and the problems of expansion with heat, contraction with cold, high temperature and high pressure easily cause the swelling and cracking of the water pump motor rotor shell, so that the problems of seizure and burning of the water pump motor are caused. The structure of the motor rotor can be applied to the motor rotor of a water pump, the metal sheath 11 and the metal end cover 12 are welded into a whole, the welding requires full-circle seamless welding, the motor rotor has good air tightness, and the problems of motor locking, machine burning and the like caused by expansion with heat and contraction with cold and high temperature and high pressure due to bulging and cracking of the excircle of the rotor assembly can be effectively avoided.

Specifically, referring to fig. 1 to 4, the metal sheath 11 may be axially open at one end and closed at the other end, a metal end cap 12 covers the open end of the metal sheath 11, one end of the rotating shaft 3 passes through the closed end of the metal sheath 11, and the other end passes through the metal end cap 12, and the metal end cap 12 and the metal sheath 11, the metal end cap 12 and the rotating shaft 3, and the metal sheath 11 and the rotating shaft 3 are connected and sealed by seamless welding to seal the rotor core 4 and the permanent magnet 5 in the metal housing 1. Referring to fig. 5 to 8, both axial ends of the metal sheath 11 may also be open, the metal end caps 12 include two metal end caps 12, the two metal end caps 12 respectively cover both open ends of the metal sheath 11 and are in sealed connection with the metal sheath 11 through seamless welding, both ends of the rotating shaft 3 respectively penetrate through the two metal end caps 12 to extend outward, and the metal end caps 12 are in sealed connection with the rotating shaft 3 through seamless welding.

The metal sheath 11 and the metal end cover 12 are preferably made of non-magnetic metal materials, so that the loss caused by the leakage flux of the motor is reduced, and the motor performance is improved in production efficiency.

Referring to fig. 7, rotor core 4 is provided with axially through holes 41 for reducing the mass thereof, and through holes 41 include at least two through holes 41 uniformly distributed around rotating shaft 3.

The metal sheath 11 is preferably cylindrical, and the outer diameter of the rotor core 4 in which the permanent magnets 5 are mounted corresponds to the inner diameter of the metal sheath 11.

The rotor core 4 is formed by stacking a plurality of silicon steel sheets in the axial direction.

Referring to fig. 6-7, the rotor core 4 and the magnets may be mounted in a surface-mount manner, specifically, a permanent magnet mounting recess 42 is formed in a side surface of the rotor core 4, the permanent magnets 5 are arc-shaped, and a concave surface facing the rotor core 4 is formed in the permanent magnet mounting recess 42, so that the permanent magnets 5 are mounted on the side surface of the rotor core 4; the corners of the permanent magnet mounting concave positions 42 are provided with anti-demagnetization grooves 43 which extend axially and are used for enabling the permanent magnets 5 to resist demagnetization, the positions of the anti-demagnetization grooves 43 correspond to the corners of the permanent magnets 5, and the permanent magnets 5 are easy to demagnetize at high temperature usually, and the anti-demagnetization grooves can enable the permanent magnets 5 to resist demagnetization. Anti-demagnetization slots 43 are provided at both end corners in the circumferential direction of the permanent magnet mounting recess 42, where the circumferential direction is also the circumferential direction of the rotor core 4.

Referring to fig. 2 to 3, the rotor core 4 and the permanent magnets 5 may be embedded, and specifically, permanent magnet mounting grooves 44 with an axial opening are formed in the rotor core 4, and the permanent magnets 5 are embedded in the permanent magnet mounting grooves 44, so that the permanent magnets 5 are embedded in the rotor core 4.

Referring to fig. 5 and 8, the metal end cover 12 includes a main body portion 121 covering the end surface of the rotor core 4 and a coating portion 122 extending axially outward and coating the side surface of the rotating shaft 3, so that the rotating shaft 3 and the metal end cover 12 are bonded more firmly.

Referring to fig. 6 and 8, a position on the side of the rotary shaft 3 contacting the rotor core 4 is provided with a convex or concave reinforcing portion 31 for enhancing friction between the rotary shaft 3 and the rotor core 4, so that the rotary shaft 3 and the rotor core 4 are more firmly combined.

The motor in one embodiment of the invention comprises a motor stator and the motor rotor rotationally matched with the motor stator.

In conclusion, the motor and the rotor thereof have the advantages that due to the adoption of the motor rotor structure, the performances of water resistance, dust prevention, corrosion prevention and the like of the rotor are greatly improved, the protection grade can reach IP67 or above, the motor can bear high temperature, high pressure, a closed environment and a severe working environment of long-term soaking liquid, the performance of the motor is improved, the noise of the motor is reduced, the service life of the motor is prolonged, and the market competitiveness is improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, as it will be apparent to those skilled in the art that various modifications, combinations and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.

Claims

1. The motor rotor is characterized by comprising a rotor core (4), a permanent magnet (5) and a rotating shaft (3), wherein the permanent magnet (5) is arranged on the rotor core (4), the motor rotor further comprises a metal shell (1), the rotating shaft (3) penetrates through the rotor core (4) and is fixed with the rotor core (4), the rotor core (4) and the permanent magnet (5) are arranged in a metal sheath (11), and two ends of the rotating shaft (3) extend out of two axial ends of the metal shell (1);

the rotating shaft (3) and the metal shell (1) are in sealed connection through seamless welding;

the metal shell (1) comprises a metal sheath (11) and a metal end cover (12), at least one of two axial ends of the metal sheath (11) is open, and the metal end cover (12) covers the open end of the metal sheath (11) and is in sealing connection with the metal sheath (11) through welding so as to seal the rotor core (4) and the permanent magnet (5) in the metal shell (1).

2. The motor rotor as recited in claim 1, wherein the metal sheath (11) is open at two axial ends, the metal end cover (12) comprises two metal end covers (12), the two metal end covers (12) respectively cover the open two ends of the metal sheath (11) and are in sealed connection with the metal sheath (11) through seamless welding, two ends of the rotating shaft (3) respectively penetrate through the two metal end covers (12) to extend outwards, and the metal end covers (12) are in sealed connection with the rotating shaft (3) through seamless welding.

3. An electric machine rotor, according to claim 1, characterized in that said metallic sheath (11) and said metallic end caps (12) are of non-magnetically conductive metallic material.

4. An electric machine rotor according to claim 1, characterized in that the rotor core (4) is provided with axially through-going through-holes (41) for lightening its mass, said through-holes (41) comprising at least two through-holes (41) evenly distributed around the rotor shaft (3).

5. An electric machine rotor, according to claim 1, characterized in that the outer diameter of the rotor core (4) carrying the permanent magnets (5) corresponds to the inner diameter of the metal sheath (11).

6. An electric machine rotor according to claim 1, characterized in that the side of the rotor core (4) is provided with a permanent magnet mounting recess (42), the permanent magnets (5) are arc-shaped, and the concave surface is provided in the permanent magnet mounting recess (42) towards the rotor core (4) for the permanent magnets (5) to be mounted on the side of the rotor core (4);

the corner of the concave position (42) for mounting the permanent magnet is provided with an axially extending anti-demagnetization groove (43) for enabling the permanent magnet (5) to resist demagnetization, and the position of the anti-demagnetization groove (43) corresponds to the corner of the permanent magnet (5).

7. The electric machine rotor as recited in claim 6, characterized in that the anti-demagnetization slots (43) are provided at both end corners in the circumferential direction of the permanent magnet installation recess (42).

8. An electric machine rotor according to claim 1, characterized in that the rotor core (4) is internally provided with an axially open permanent magnet mounting slot (44), and the permanent magnet (5) is embedded in the permanent magnet mounting slot (44) for embedded mounting of the permanent magnet (5) in the rotor core (4).

9. An electric machine rotor according to claim 1, characterized in that the metal end cover (12) comprises a main body portion (121) covering the end face of the rotor core (4) and a cladding portion (122) extending axially outward and cladding the side face of the rotating shaft (3).

10. An electrical machine comprising a machine stator and a machine rotor according to any of claims 1-9 in rotational engagement with the machine stator.