CN112636508A

CN112636508A - Motor rotor structure

Info

Publication number: CN112636508A
Application number: CN202011607043.8A
Authority: CN
Inventors: 印光宇; 吴兴; 徐兆明
Original assignee: Jiangsu Shangqi Group Co ltd
Current assignee: Jiangsu Shangqi Group Co ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2021-04-09

Abstract

The invention discloses a motor rotor structure, which comprises a motor rotating shaft and an inner rotor iron core, wherein the inner rotor iron core is sleeved on the periphery of the motor rotating shaft; the outer rotor iron core is sleeved on the periphery of the inner rotor iron core; a gap is formed between the inner rotor iron core and the outer rotor iron core, and injection rubber is filled in the gap and is used for connecting and molding the inner rotor iron core and the outer rotor iron core; the limiting ribs are uniformly arranged on the outer surface of the outer rotor iron core in a circumferential shape; and the permanent magnet is mounted between the adjacent limiting ribs through clamping. According to the invention, the outer rotor core and the inner rotor core are connected and molded by injection rubber, so that the connection firmness of the outer rotor core and the inner rotor core can be improved, the service life is prolonged, and the inner core rotor and the outer core rotor are isolated by adopting rubber, so that the internal electric corrosion of a motor bearing can be effectively reduced, and the service life of the motor bearing is prolonged; meanwhile, the vibration of the motor is reduced, and the load noise of the motor is reduced.

Description

Motor rotor structure

Technical Field

The invention relates to the technical field of motor rotors, in particular to a motor rotor structure.

Background

The rubber shock absorption rotor is a new rotor structure, an external magnetic shoe is fixed by adopting a PBT material, and a rubber elastic material is adopted between an inner rotor and an outer rotor to provide a shock absorption effect. In the prior art, bosses of an outer rotor and bosses of an inner rotor are generally spaced, and the production method comprises the steps of firstly completing injection molding of external PBT (polybutylene terephthalate) materials and then performing injection molding of rubber elastic materials on the inside. The original design and processing method are easy to have the following disadvantages or shortcomings:

1. the inner rotor and the outer rotor are fixed only by rubber, and the axial bearing force is small; the usage amount of the elastic rubber is large;

2. twice injection molding and twice die filling are easy to generate deviation, the injection molding concentricity is poor, and the dynamic balance of the product is poor;

3. the motor has large vibration and poor noise, and affects the normal operation and use of the whole machine.

In summary, there is a need for a rotor structure for an electric machine that solves the above problems.

Disclosure of Invention

The present invention is directed to a rotor structure of an electric machine, which solves the above problems of the prior art.

In order to solve the technical problems, the invention provides the following technical scheme:

an electric motor rotor structure, includes the motor shaft, still includes:

the inner rotor iron core is sleeved on the periphery of the motor rotating shaft;

the outer rotor iron core is sleeved on the periphery of the inner rotor iron core;

a gap is formed between the inner rotor iron core and the outer rotor iron core, and injection rubber is filled in the gap and is used for connecting and molding the inner rotor iron core and the outer rotor iron core;

the limiting ribs are arranged on the outer surface of the outer rotor core, a plurality of limiting ribs are arranged on the outer surface of the outer rotor core, and the limiting ribs are uniformly distributed on the outer surface of the outer rotor core;

and the permanent magnet is mounted between the adjacent limiting ribs through clamping.

Furthermore, the contact position of the limiting rib and the permanent magnet is coated with injection molding plastic, and the injection molding plastic is used for avoiding the permanent magnet from falling off.

Furthermore, the outer rotor iron core is formed by laminating a first outer iron core and a second outer iron core, and the first outer iron core is arranged on the upper end face and the lower end face of the second outer iron core.

Furthermore, the outer rotor iron core is annular, and a plurality of first bosses are uniformly arranged on the inner surface of the first outer iron core.

Furthermore, the inner rotor core is formed by laminating a first inner core and a second inner core, and the first inner core is arranged on the upper end face and the lower end face of the second inner core.

Furthermore, the inner rotor iron core is annular, and a plurality of second bosses are uniformly arranged on the outer side surface of the second inner iron core.

Furthermore, the first boss and the second boss are mutually clamped.

Further, the permanent magnet is a magnetic shoe permanent magnet.

Compared with the prior art, the invention has the following beneficial effects:

1. the outer rotor core and the inner rotor core are connected and molded through injection rubber, so that the connection firmness of the outer rotor core and the inner rotor core can be improved, the service life is prolonged, and the inner core rotor and the outer core rotor are isolated by adopting rubber, so that the internal electric corrosion of a motor bearing can be effectively reduced, and the service life of the motor bearing is prolonged; meanwhile, the vibration of the motor is reduced, and the load noise of the motor is reduced.

2. The outer iron core rotor and the magnetic shoe permanent magnet are molded by injection molding plastics in one step, so that the falling of the magnetic shoe permanent magnet caused by centrifugal force in the rotating process of the rotor or the insecure falling of the permanent magnet during installation can be effectively avoided, and the insulating effect is achieved; meanwhile, the fixing device has the effects of simple process and firm fixation, and can reduce the production cost in the production process.

3. The rotor integrated machining and forming method has the advantages that the rotor is placed and positioned at one time in an assembling mode, double-head injection molding is conducted, the concentricity of the rotor can be improved, the unbalance of the rotor is reduced, two injection molding materials are designed in a double-flow-channel mode, the two injection molding materials are matched in one-time assembling mode, and the production efficiency of products is improved.

4. Let the setting of first boss and second boss block, can improve the firm in connection nature of outer rotor iron core and inner rotor iron core, improve life.

Drawings

The accompanying drawings, which are included to provide a further understanding 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 and not to limit the invention. In the drawings:

FIG. 1 is a schematic cross-sectional view of the present invention;

FIG. 2 is a schematic top view of the present invention;

fig. 3 is a schematic structural view of an outer rotor core of the present invention;

FIG. 4 is a schematic view of the inner rotor core structure of the present invention;

fig. 5 is a schematic structural view of the injection mold of the present invention.

In the figure: 110. an outer rotor core; 111. a first outer core; 112. a second outer core; 113. A first boss; 114. limiting ribs; 120. an inner rotor core; 121. a first inner core; 122. a second inner core; 123. a second boss; 130. a magnetic shoe permanent magnet; 140. injection molding rubber; 150. injection molding plastic; (ii) a 160. An upper die; 170. and (5) a lower die.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1-5, the present invention provides the following technical solutions:

example (b):

an electric motor rotor structure, includes the motor shaft, still includes:

an inner rotor core 120 sleeved on the periphery of the motor rotating shaft;

an outer rotor core 110 fitted around the inner rotor core 120;

a gap is formed between the inner rotor core 120 and the outer rotor core 110, and injection rubber 140 is filled in the gap and used for connecting and forming the inner rotor core 120 and the outer rotor core 110;

the limiting ribs 114 are arranged on the outer surface of the outer rotor core 110, a plurality of limiting ribs 114 are arranged on the outer surface of the outer rotor core 110, and the limiting ribs 114 are uniformly distributed on the outer surface of the outer rotor core 110;

and the permanent magnets 130 are installed between the adjacent limiting ribs 114 through clamping.

The contact position of the limiting rib 114 and the permanent magnet 130 is coated with injection molding plastic 150, the injection molding plastic 150 is a PBT material, and the injection molding plastic 150 is used for preventing the permanent magnet 130 from falling off.

The outer rotor core 110 is formed by laminating a first outer core 111 and a second outer core 112, the first outer core 111 is mounted on the upper and lower end surfaces of the second outer core 112, and the thickness of the first outer core 111 is generally 3-5 mm.

The outer rotor core 110 is annular, and a plurality of first bosses 113 are uniformly arranged on the inner surface of the first outer core 111.

The inner rotor core 120 is formed by laminating a first inner core 121 and a second inner core 122, the first inner core 121 is mounted on the upper and lower end surfaces of the second inner core 122, and the thickness of the first inner core 121 is generally 1mm smaller than that of the first outer core 111.

The inner rotor core 120 is annular, and a plurality of second bosses 123 are uniformly arranged on the outer side surface of the second inner core 122.

The first boss 113 and the second boss 123 are engaged with each other with a gap of 1mm between the upper and lower sides, and injection rubber 140 is injected into the gap.

The permanent magnet 130 is a magnetic shoe permanent magnet, and the permanent magnet preferably adopts a post-magnetizing process, namely, after the rotor is injection molded, the magnetic steel of the permanent magnet is magnetized before the rotor is assembled, so that the scrapping of the permanent magnet in a production turnover link is avoided, and the production cost can be effectively reduced.

When the motor rotor needs to be subjected to injection molding, the motor rotor can be placed above 3 lower molds 170 of an injection molding machine, then the lower molds 170 are driven to rotate to the position of PBT injection, one PBT injection molding is completed, the permanent magnet 130 is ensured to be fixedly connected with the limiting ribs 114, the permanent magnet 130 is prevented from falling off or being installed insecurely and falling off due to centrifugal force in the rotating process of the rotor, the injection molding machine is restarted, the lower molds 170 rotate to the position of rubber injection, the rubber injection molding is completed, the outer rotor core 110 and the inner rotor core 120 are integrated, the injection molding machine is restarted and rotated to the position close to the side, and a finished product rotor is taken out; through the two upper dies 160 and the three lower dies 170, the alternate production of the rotor is realized, and the uninterrupted production is realized.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides an electric motor rotor structure, includes the motor shaft, its characterized in that still includes:

the inner rotor iron core (120) is sleeved on the periphery of the motor rotating shaft;

an outer rotor core (110) sleeved on the periphery of the inner rotor core (120);

a gap is arranged between the inner rotor iron core (120) and the outer rotor iron core (110), and injection rubber (140) is filled in the gap and used for connecting and molding the inner rotor iron core (120) and the outer rotor iron core (110);

the limiting ribs (114) are arranged on the outer surface of the outer rotor core (110), a plurality of limiting ribs (114) are arranged on the outer surface of the outer rotor core (110), and the limiting ribs (114) are uniformly distributed on the outer surface of the outer rotor core (110);

and the permanent magnets (130) are mounted between the adjacent limiting ribs (114) through clamping.

2. A rotor structure of an electric machine according to claim 1, characterized in that:

the contact position of spacing muscle (114) and permanent magnet (130) coats and has injection moulding plastics (150), injection moulding plastics (150) are used for avoiding droing of permanent magnet (130).

3. A rotor structure of an electric machine according to claim 1, characterized in that:

the outer rotor iron core (110) is formed by laminating a first outer iron core (111) and a second outer iron core (112), and the first outer iron core (111) is arranged on the upper end face and the lower end face of the second outer iron core (112).

4. A rotor structure of an electric machine according to claim 3, characterized in that:

the outer rotor iron core (110) is annular, and a plurality of first bosses (113) are uniformly arranged on the inner surface of the first outer iron core (111).

5. A rotor structure of an electric machine according to claim 1, characterized in that:

the inner rotor core (120) is formed by laminating a first inner core (121) and a second inner core (122), and the first inner core (121) is installed on the upper end face and the lower end face of the second inner core (122).

6. A rotor structure of an electric machine according to claim 5, characterized in that:

the inner rotor core (120) is annular, and a plurality of second bosses (123) are uniformly arranged on the outer side surface of the second inner core (122).

7. A rotor structure of an electric machine according to claim 4, characterized in that: the first boss (113) and the second boss (123) are mutually clamped.

8. A rotor structure of an electric machine according to claim 1, characterized in that: the permanent magnet (130) is a magnetic shoe permanent magnet.