CN215344254U

CN215344254U - Rotor assembly and switched reluctance motor

Info

Publication number: CN215344254U
Application number: CN202120994962.9U
Authority: CN
Inventors: 李家会
Original assignee: Shenzhen Topband Co Ltd
Current assignee: Shenzhen Topband Co Ltd
Priority date: 2021-05-11
Filing date: 2021-05-11
Publication date: 2021-12-28
Anticipated expiration: 2031-05-11

Abstract

The utility model is suitable for the field of motors, and provides a rotor assembly and a switched reluctance motor, wherein the rotor assembly comprises: a rotor core; a rotating shaft; the fan blade is provided with a plurality of first bosses which correspond to the through grooves one by one and are inserted into the through grooves, and the first bosses and the inner walls of the through grooves are enclosed to form a first accommodating cavity; the light screen is provided with a plurality of second bosses which correspond to the through grooves one by one and are inserted into the through grooves, and the second bosses and the inner walls of the through grooves are enclosed to form a second accommodating cavity; a counterweight loaded within the first receiving cavity and/or the second receiving cavity. According to the embodiment of the utility model, the counter weights are loaded in the first containing cavity and/or the second containing cavity, the rotor assembly is balanced and corrected, so that the rotor assembly meets the balance requirement, the rotor core is not required to be cut, the balance cutting equipment is not required, the production cost is low, the symmetry of a magnetic circuit of the motor can be ensured, and the electrical performance and the pneumatic performance of the motor are ensured.

Description

Rotor assembly and switched reluctance motor

Technical Field

The utility model belongs to the field of motors, and particularly relates to a rotor assembly and a switched reluctance motor.

Background

A Switched Reluctance Motor (SRM) is a type of variable speed Motor developed after a dc Motor and a brushless dc Motor. The research on the switched reluctance motor in the countries of English, American and the like is early, and remarkable effect is achieved, the power level of the product ranges from several watts to hundreds of kilowatts, and the switched reluctance motor is widely applied to the fields of household appliances, aviation, aerospace, electronics, machinery, electric vehicles and the like.

The switched reluctance motor is of a double-salient-pole structure and comprises a stator with windings and a rotor assembly sleeved in the stator. As shown in fig. 1, the rotor assembly is composed of a rotor core 11 ', a rotating shaft and a light shielding plate 14' disposed on an end face of the rotor core. In this configuration, since there is a precision error in the parts at the time of machining, there is a difference in the density of the respective position points in each part, and these factors cumulatively cause the mass of the respective position points of the rotor assembly to be inconsistent. Therefore, when the motor works, the rotor assembly runs at a high speed, unbalanced radial force is inevitably generated, the motor is greatly vibrated, and the performance and the service life of the motor are seriously influenced. Therefore, the rotor assembly must be balance-corrected during the motor production process. Because the position points have great randomness, each rotor assembly has to be balanced to ensure the quality of each motor.

Because the rotor core adopts a salient pole structure, the prior art adopts a weight removing method to carry out balance correction, namely, after an unbalanced point is detected, metal with corresponding weight is cut off at a corresponding point of the rotor core, so that the rotor assembly reaches the balance requirement.

In order to ensure the balance precision and the production efficiency, when the balance is corrected by adopting a weight removing method, special balance cutting integrated equipment is needed, the equipment is expensive and high in maintenance cost, so that the production cost is high, the technical requirement on operators is high, and the manual investment is large. Moreover, when the rotor core is cut, the symmetry of the magnetic circuit of the motor is destroyed, and the electrical performance and the pneumatic performance of the motor are influenced to a certain extent.

SUMMERY OF THE UTILITY MODEL

The utility model provides a rotor assembly, and aims to solve the problem of high cost caused by the fact that a rotor assembly is subjected to balance correction by a de-weighting method in the production process of an existing switched reluctance motor.

The present invention is achieved as a rotor assembly comprising:

the rotor comprises a rotor core, wherein a first shaft hole is formed in the middle of the rotor core, a plurality of salient poles are uniformly distributed on the side face of the rotor core, and a through groove penetrating through two ends of the rotor core is formed between every two adjacent salient poles;

the rotating shaft penetrates through the first shaft hole;

the fan blade is arranged at one end of the rotor core, one side of the fan blade, facing the rotor core, is provided with a plurality of first bosses which are in one-to-one correspondence with the through grooves and are inserted into the through grooves, and the first bosses and the inner walls of the through grooves are enclosed to form a first accommodating cavity;

the light screen is arranged at the other end of the rotor core, one side of the light screen, facing the rotor core, is provided with a plurality of second bosses which are in one-to-one correspondence with the through grooves and are inserted into the through grooves, and the second bosses and the inner walls of the through grooves are enclosed to form a second accommodating cavity;

a counterweight loaded within the first receiving cavity and/or the second receiving cavity for balance correction of the rotor assembly.

Still further, there is a gap between the first boss and the second boss that are oppositely arranged.

Furthermore, the distances between the first bosses and the axial center line of the rotating shaft are equal, and the distances between the second bosses and the axial center line of the rotating shaft are equal.

Further, the first boss and the second boss are both arc-shaped sheets.

Furthermore, the first bosses are circumferentially arranged by taking the shaft center line of the rotating shaft as a center, and the second bosses are circumferentially arranged by taking the shaft center line of the rotating shaft as a center.

Further, the first boss and the second boss are both formed by removing materials at equal intervals from a protruding circular ring.

Further, a distance between two adjacent first bosses and a distance between two adjacent second bosses are both larger than the salient pole width.

The fan blade includes:

a plurality of wind blades evenly arranged in the circumferential direction;

the first air disc and the second air disc are arranged in parallel and connected through the air blades, and the first boss is arranged on one side, facing the rotor core, of the second air disc;

and the plurality of reinforcing ribs are uniformly arranged on the other side of the second air disc in the circumferential direction.

Furthermore, a plurality of shading sheets are arranged on one side of the shading plate, which faces away from the rotor core, at equal intervals.

The utility model also provides a switched reluctance motor which comprises a stator core containing windings and a rotor assembly arranged in the stator core, wherein the rotor assembly is the rotor assembly.

According to the embodiment of the utility model, the first boss inserted into the through groove is arranged on one side of the fan blade facing the rotor core, the first boss and the inner wall of the through groove are enclosed to form the first accommodating cavity, the second boss inserted into the through groove is arranged on one side of the shading plate facing the rotor core, the second boss and the inner wall of the through groove are enclosed to form the second accommodating cavity, and the balance weight is loaded in the first accommodating cavity and/or the second accommodating cavity to balance and correct the rotor assembly, so that the rotor assembly meets the balance requirement, the rotor core is not required to be cut, balance cutting equipment is not required, the production cost is low, the symmetry of a motor magnetic circuit can be ensured, and the electrical performance and the pneumatic performance of the motor are ensured.

Drawings

FIG. 1 is a perspective view of a rotor assembly provided by the prior art;

FIG. 2 is a perspective view of a rotor assembly provided by the present invention;

FIG. 3 is a cross-sectional view of a rotor assembly provided by the present invention;

FIG. 4 is an exploded view of a rotor assembly provided by the present invention;

FIG. 5 is a perspective view of a fan blade provided by the present invention;

FIG. 6 is another view of a perspective view of a fan blade provided by the present invention;

FIG. 7 is a perspective view of a visor provided by the present invention;

fig. 8 is a perspective view of a switched reluctance motor provided in the present invention;

fig. 9 is an exploded view of a switched reluctance motor provided in the present invention.

In the figures, 10, a rotor assembly; 11. a rotor core; 111. a first shaft hole; 112. salient poles; 113. a through groove; 12. a rotating shaft; 13. a fan blade; 131. a first boss; 132. a wind blade; 133. a first wind plate; 134. a second wind plate; 135. reinforcing ribs; 136. a second shaft hole; 137. an air duct; 14. a first accommodating chamber; 15. a visor; 151. a second boss; 152. a shading sheet; 16. a second accommodating chamber; 20. a stator core; 30. a front end cover; 40. a rear end cap; 50. and a bearing.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

According to the rotor assembly, one side, facing the rotor core, of each fan blade is provided with a plurality of first bosses which correspond to the through grooves one to one and are inserted into the through grooves, and the first bosses and the inner walls of the through grooves are enclosed to form a first accommodating cavity; a plurality of second bosses which correspond to the through grooves one by one and are inserted into the through grooves are arranged on one side, facing the rotor core, of the light shielding plate, and the second bosses and the inner walls of the through grooves are enclosed to form a second accommodating cavity; and loading a counterweight in the first accommodating cavity and/or the second accommodating cavity for balance correction of the rotor assembly. According to the embodiment of the utility model, the first boss inserted into the through groove is arranged on one side of the fan blade facing the rotor core, the first boss and the inner wall of the through groove are enclosed to form the first accommodating cavity, the second boss inserted into the through groove is arranged on one side of the shading plate facing the rotor core, the second boss and the inner wall of the through groove are enclosed to form the second accommodating cavity, and the balance weight is loaded in the first accommodating cavity and/or the second accommodating cavity to balance and correct the rotor assembly, so that the rotor assembly meets the balance requirement, the rotor core is not required to be cut, balance cutting equipment is not required, the production cost is low, the symmetry of a motor magnetic circuit can be ensured, and the electrical performance and the pneumatic performance of the motor are ensured.

Example one

As shown in fig. 2-7, the present invention provides a rotor assembly 10 comprising:

the rotor comprises a rotor core 11, wherein a first shaft hole 111 is formed in the middle of the rotor core 11, a plurality of salient poles 112 are uniformly distributed on the side surface of the rotor core, and through grooves 113 penetrating through two ends of the rotor core 11 are formed between every two adjacent salient poles 112;

a rotating shaft 12 penetrating the first shaft hole 111;

the fan blades 13 are arranged at one end of the rotor core 11, one side of each fan blade 13, which faces the rotor core 11, is provided with a plurality of first bosses 131 which are in one-to-one correspondence with the through grooves 113 and are inserted into the through grooves 113, and the first bosses 131 and the inner walls of the through grooves 113 are enclosed to form a first accommodating cavity 14;

the light shielding plate 15 is arranged at the other end of the rotor core 11, one side of the light shielding plate 15, which faces the rotor core 11, is provided with a plurality of second bosses 151 which are in one-to-one correspondence with the through grooves 113 and are inserted into the through grooves 113, and the second bosses 151 and the inner walls of the through grooves 113 are enclosed to form a second accommodating cavity 16;

weights (not shown) loaded in the first and/or second pockets 14, 16 for balance correction of the rotor assembly 10.

The light shielding plate 15 is provided with a plurality of second bosses 151 corresponding to the through slots 113 one by one and inserted into the through slots 113 on one side facing the rotor core 11, and a plurality of light shielding sheets 152 are arranged on one side opposite to the rotor core 11 at equal intervals.

The distance between two adjacent first bosses 131 and the distance between two adjacent second bosses 151 are both greater than the width of the salient pole 112, and the salient pole 112 can extend between two adjacent first bosses 131 and between two adjacent second bosses 151, so that the first bosses 131 and the second bosses 151 can be inserted into the through slots 113 without interference.

The balance correction rotor assembly 10 is to balance the density and the mass of each position of the rotor assembly 10, so that the rotor assembly 10 is symmetrical about the axis line of the rotating shaft 12, and the mass balance of each position is achieved.

The rotor assembly 10 provided by the utility model adopts a weighting method to correct balance in the production process, metal does not need to be cut on the rotor iron core 11, and a counterweight balance correction rotor assembly 10 with good plasticity and low cost is added instead. The weight is loaded in the first accommodating cavity 14 and/or the second accommodating cavity 16, and the weight is prevented from falling off during high-speed operation.

The mass and position of the counterweight are variable, and the counterweight with the corresponding mass can be loaded in the first accommodating cavity 14, the second accommodating cavity 16 or the first accommodating cavity 14 and the second accommodating cavity 16 according to the unbalance point position of the rotor assembly 10 and the unbalance amount at the position detected by the balance detection equipment. During the balance correction, according to the unbalance point position of the rotor assembly 10 and the unbalance amount of the position detected by the balance detection device, the balance weight corresponding to the unbalance amount is loaded into the first accommodating cavity 14 and/or the second accommodating cavity 16 of the corresponding position, so as to achieve the effect of balance correction.

The amount of unbalance is generally in mg or g.

The counterweight can be balancing mud or a pre-configured counterweight metal block.

The balance mud is preferred in the embodiment because the balance mud can be molded or the mass of the balance mud can be increased or decreased at will.

And the counterweight is loaded in the first accommodating cavity 14 and/or the second accommodating cavity 16, the first boss 131 and the second boss 151 can prevent the counterweight from being thrown outwards due to centrifugal force when the motor runs, and the counterweight can be prevented from falling off due to centrifugal force in the high-speed running process, so that the motor runs more safely and reliably. When the counterweight is balance mud, the balance mud can be attached to the inner wall of the first accommodating cavity 14 and/or the second accommodating cavity 16; when the counterweight is a counterweight metal block, the counterweight block can be fixed in the first accommodating cavity 14 and/or the second accommodating cavity 16 by using balance mud or bonding agent, so that the risk of falling off of the counterweight block due to centrifugal force in the high-speed operation process is further reduced.

In the embodiment, the rotor assembly 10 for balancing and correcting the counter weights is loaded in the first accommodating cavity 14 and/or the second accommodating cavity 16, the traditional balancing process by the de-weighting method is changed into the balancing process by the weighting method, metal cutting on the rotor is not needed, only the counter weights with good plasticity and low cost are needed to be added, the balancing process is simplified, the investment dependence on high-value equipment is reduced, the production cost is reduced, the efficiency is improved, and the reduction of the electrical performance and the mobility performance of the motor caused by the asymmetry of a magnetic circuit caused by cutting the metal of the rotor is avoided.

According to the embodiment of the utility model, the first boss 131 inserted into the through groove 113 is arranged on one side of the fan blade 13 facing the rotor core 11 and is surrounded with the inner wall of the through groove 113 to form the first accommodating cavity 14, the second boss 151 inserted into the through groove 113 is arranged on one side of the shading plate 15 facing the rotor core 11 and is surrounded with the inner wall of the through groove 113 to form the second accommodating cavity 16, and the first accommodating cavity 14 and/or the second accommodating cavity 16 are/is internally loaded with the counterweight to balance and correct the rotor assembly 10, so that the rotor assembly 10 meets the balance requirement, the rotor core 11 is not required to be cut, balance cutting equipment is not required, the production cost is low, the symmetry of a motor magnetic circuit can be ensured, and the electrical performance and the pneumatic performance of the motor are ensured.

Example two

In an alternative embodiment of the present invention, as shown in fig. 2 and 3, a gap is formed between the first boss 131 and the second boss 151 which are oppositely arranged.

The first boss 131 and the second boss 151 disposed opposite to each other refer to the first boss 131 and the second boss 151 disposed in the same through slot 113, and a gap is left between the first boss 131 and the second boss 151 disposed opposite to each other, and the gap can be used as an operation space, and a weight is loaded into the first accommodation chamber 14 and/or the second accommodation chamber 16 through the gap.

EXAMPLE III

As shown in fig. 2 to 7, in an alternative embodiment of the present invention, the first bosses 131 are all equidistant from the axial centerline of the rotating shaft 12, and the second bosses 151 are all equidistant from the axial centerline of the rotating shaft 12.

Specifically, the first boss 131 and the second boss 151 are both arc-shaped pieces. Of course, the first and

second bosses

131 and 151 may be a flat plate or other shape. The first bosses 131 are circumferentially arranged with the axial center line of the rotating shaft 12 as a center, and the second bosses 151 are circumferentially arranged with the axial center line of the rotating shaft 12 as a center, so that distances between all the first bosses 131 and the axial center lines of the rotating shaft 12 are equal, and distances between all the second bosses 151 and the axial center lines of the rotating shaft 12 are equal.

The distances between the first bosses 131 and the axial center line of the rotating shaft 12 are equal, so that the first bosses 131 are distributed on the rotor core 11 in a balanced manner, the distances between the second bosses 151 and the axial center line of the rotating shaft 12 are equal, and the second bosses 151 are distributed on the rotor core 11 in a balanced manner, thereby avoiding the problem that the rotor core 11, the fan blades 13 and the light shielding plate 15 are not balanced integrally due to the self-unbalance of the first bosses 131 or the second bosses 151.

The first bosses 131 and the second bosses 151 may be formed in various manners, for example, the first bosses 131 and the second bosses 151 are formed by removing materials from convex circular rings at equal intervals, or the first bosses 131 and the second bosses 151 are formed by convex protrusions at equal intervals, so that the first bosses 131 and the second bosses 151 are arranged at equal intervals.

Example four

As shown in fig. 5 and 6, in an alternative embodiment of the present invention, the fan blade 13 includes:

a plurality of wind blades 132 uniformly arranged in the circumferential direction;

a first wind disk 133 and a second wind disk 134 arranged in parallel and connected by the wind blades, wherein the first boss 131 is arranged on one side of the second wind disk 134 facing the rotor core 11;

and the plurality of reinforcing ribs 135 are uniformly arranged on the other side of the second air disc 134 in the circumferential direction.

The first wind disk 133 is far away from the rotor core 11, the second wind disk 134 is close to the rotor core 11, and a second shaft hole 136 through which the rotating shaft 12 passes is formed in the middle of the second wind disk 134. The gaps formed between two adjacent wind blades 132 form the wind channels 137, and the wind channels 137 are equal in size because the wind blades 132 are uniformly arranged in the circumferential direction. The number of the wind blades 132 is 36 or other, and the number of the reinforcing ribs 135 is 6 or other.

The air duct 137 with the same size is formed by arranging the plurality of air blades 132 which are uniformly distributed in the circumferential direction, the structure is simple, the symmetry and the balance are good, the motor is suitable for forward and reverse rotation operation, and the heat dissipation performance is good; the strength of the second wind disk 134 is improved through the reinforcing ribs 135 which are uniformly arranged in the circumferential direction, and the service life of the fan blades 13 is prolonged.

EXAMPLE five

As shown in fig. 8 and 9, a switched reluctance motor according to another embodiment of the present invention includes a stator core 20 including windings, a rotor assembly 10 disposed in the stator core 20, and a front end cover 30 and a rear end cover 40 fastened to end surfaces of the stator core 20, where the rotor assembly 10 is the above-mentioned rotor assembly 10. Wherein the rotating shaft 12 of the rotor assembly 10 is connected with the front end cover 30 and the rear end cover 40 through the bearing 50.

The utility model greatly reduces the production cost of the switched reluctance motor, reduces the vibration and the noise of the motor, ensures the electrical performance and the pneumatic performance of the motor, improves the overall quality of the motor, expands the application range and the market space of the switched reluctance motor, and is particularly suitable for household appliances with higher requirements on silence, such as refrigerators, washing machines, air conditioners and the like.

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 utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A rotor assembly, comprising:

the rotating shaft penetrates through the first shaft hole;

2. The rotor assembly of claim 1 wherein the first and second oppositely disposed bosses have a gap therebetween.

3. The rotor assembly of claim 1 or 2 wherein the first bosses are all equidistant from the axial centerline of the shaft and the second bosses are all equidistant from the axial centerline of the shaft.

4. The rotor assembly of claim 3 wherein the first boss and the second boss are each arcuate tabs.

5. The rotor assembly of claim 4 wherein the first bosses are circumferentially arranged about a shaft centerline of the shaft and the second bosses are circumferentially arranged about the shaft centerline of the shaft.

6. The rotor assembly of claim 5 wherein the first boss and the second boss are each formed by a raised annular ring of equally spaced removed material.

7. The rotor assembly of claim 1, wherein a distance between two adjacent first bosses and a distance between two adjacent second bosses are both greater than the salient pole width.

8. The rotor assembly of claim 1, wherein the fan blade comprises:

a plurality of wind blades evenly arranged in the circumferential direction;

9. The rotor assembly of claim 1 wherein a plurality of louvers are provided at equal intervals on a side of the louver facing away from the rotor core.

10. A switched reluctance machine comprising a stator core comprising windings, and a rotor assembly disposed within the stator core, the rotor assembly being as claimed in any one of claims 1 to 8.