CN215186125U

CN215186125U - Self-starting permanent magnet motor rotor and rotor punching sheet

Info

Publication number: CN215186125U
Application number: CN202121698747.0U
Authority: CN
Inventors: 陈石香; 林星江; 林云富; 陈启县
Original assignee: Hengsu Holdings Co ltd
Current assignee: Hengsu Holdings Co ltd
Priority date: 2021-07-26
Filing date: 2021-07-26
Publication date: 2021-12-14
Anticipated expiration: 2031-07-26

Abstract

The utility model discloses a self-starting permanent magnet motor rotor, which comprises a rotor core formed by laminating rotor punching sheets and end rings arranged at two ends of the rotor core; a group of balance columns are arranged on the end face of the end ring along the circumferential direction; the middle part of the rotor punching sheet is provided with a shaft hole for installing a rotating shaft, the edge of the rotor punching sheet is uniformly provided with a group of squirrel cage starting grooves along the circumferential direction, and the squirrel cage starting grooves are tip-top flat-bottom grooves; a group of magnetic steel grooves are uniformly distributed on the inner side of the squirrel cage starting groove; a plurality of positioning holes are formed in the inner side of the magnetic steel groove; the inner wall of the shaft hole is provided with an inclined key slot. The self-starting permanent magnet motor rotor of the utility model is provided with the squirrel cage starting groove with a specific structure, so that the permanent magnet motor can be directly started in a network without being provided with a special driver and can quickly reach the synchronous rotating speed; in addition, the rotor punching sheet is provided with a positioning hole, so that the magnetic steel grooves can be aligned after the rotor is die-cast, and the magnetic steel can be easily inserted. Correspondingly, the utility model also provides a self-starting permanent-magnet machine rotor punching.

Description

Self-starting permanent magnet motor rotor and rotor punching sheet

Technical Field

The utility model relates to the technical field of electric machines, concretely relates to self-starting permanent-magnet machine rotor and rotor punching.

Background

In recent years, with the continuous development of electronic control technology, the manufacturing process of permanent magnets is continuously improved, and permanent magnet motors are well developed. The permanent magnet motor adopts the permanent magnet to generate the magnetic field of the motor, does not need an excitation coil or an excitation current, has the advantages of small volume, light weight, small loss, high power, reliable operation and the like, is a good energy-saving motor, and is widely applied to the aspects of industrial production, civil use and the like. The rotor punching sheet is used as a key part of the permanent magnet motor, and whether the design of the rotor punching sheet is reasonable or not is the key of the design success of the permanent magnet motor.

In the prior art, the structural design of the rotor punching sheet of the permanent magnet motor is not reasonable enough, so that the motor cannot smoothly involve synchronous operation after being started; and the magnetic strength of the motor is unreasonable, so that the locked-rotor torque of the motor is larger. In addition, the current self-starting permanent magnet motor mostly adopts a uniform air gap structure, and the rotor punching sheet groove type of the self-starting permanent magnet motor is mostly the same, so that air gap magnetic density wave sine distortion is easily caused, a large amount of harmonic waves are generated, the loss of the motor is increased, the vibration and the noise of the motor are increased, the quantity of magnetic steel is small, the magnetic density of the motor is influenced, and the power density and the starting performance of the motor are influenced. In order to reduce harmonic waves, most motors adopt a chute structure, so that the positioning difficulty is increased, and if the positioning is not accurate, the distribution of a stator magnetic field and a rotor magnetic field is not corresponding, so that the efficiency of the motor is reduced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a self-starting permanent magnet motor rotor for overcome the above-mentioned problem that exists among the prior art. The self-starting permanent magnet motor rotor of the utility model designs the squirrel cage starting groove with a specific structure on the rotor punching sheet, so that the permanent magnet motor can be directly started by network power without being provided with a special driver and can quickly reach the synchronous rotating speed; in addition, the rotor punching sheet is provided with a positioning hole, so that the magnetic steel grooves can be aligned after the rotor is die-cast, and the magnetic steel can be easily inserted. Correspondingly, the utility model also provides a self-starting permanent-magnet machine rotor punching.

To the rotor, the technical scheme of the utility model is: a self-starting permanent magnet motor rotor comprises a rotor core formed by stacking rotor punching sheets and end rings arranged at two ends of the rotor core; a group of balance columns are arranged on the end face of the end ring along the circumferential direction; the middle part of the rotor punching sheet is provided with a shaft hole for installing a rotating shaft, the edge of the rotor punching sheet is uniformly provided with a group of squirrel cage starting grooves along the circumferential direction, and the squirrel cage starting grooves are tip top and flat bottom grooves; a group of magnetic steel grooves for inserting magnetic steel are uniformly distributed on the inner side of the squirrel cage starting groove; a plurality of positioning holes are formed in the inner side of the magnetic steel groove; the inner wall of the shaft hole is provided with an inclined key groove, and the bottom of the inclined key groove is provided with an inclined plane.

Compared with the prior art, the rotor of the self-starting permanent magnet motor has the advantages that the squirrel cage starting groove is designed on the rotor punching sheet, so that the permanent magnet motor can be directly started in a grid power mode without being provided with a special driver; the squirrel-cage starting groove is a pointed top flat bottom groove, so that the motor can be quickly started; the positioning holes are designed on the rotor punching sheet, so that the magnetic steel grooves can be aligned after the rotor is die-cast, and the magnetic steel can be easily inserted; the rotor punching sheet is provided with the inclined key groove, so that the most harmful harmonic wave in an air gap magnetic field can be eliminated or weakened, and the starting performance and the running performance of the motor are improved; in addition, through set up the balancing column on the end ring at rotor core both ends, improved the dynamic balance performance of rotor for the rotor is more stable when high-speed rotatory, the noise is littleer, it is more even to be heated, has prolonged its life.

Preferably, the balance column is in a round table shape, and the diameter of the top of the balance column is smaller than that of the bottom of the balance column. Therefore, the structure of the balance column is more stable, and the balance column is prevented from being damaged by external force. Further, the centerline of the balancing post may be located inside the end ring end face. The non-standard design that the inner side set up is leaned on to the stabilizer, can avoid the stabilizer size when great, hang out for the end ring lateral surface to can avoid the enameled wire on the stator to be cut bad by the stabilizer.

Preferably, the magnetic steel grooves are in a radial straight line shape, and the connecting lines of the magnetic steel grooves enclose a regular polygon. At the moment, the magnetic leakage of the magnetic steel can be controlled within a reasonable range under the condition of not influencing the rigidity of the rotor core and the trend of a magnetic circuit, the using amount of the magnetic steel is saved, the utilization rate of the magnetic steel is effectively improved, and the manufacturing cost of the motor is reduced. Furthermore, the middle part of the magnetic steel groove is rectangular, the left and right protruding end parts are triangular, and the left and right protruding end parts are symmetrically arranged. At the moment, the magnetic steel groove has simple, compact and reasonable structure, is convenient to manufacture and is easy for batch production.

And optimally, 28 squirrel-cage starting grooves are uniformly formed in the edge of the rotor punching sheet along the circumferential direction. Furthermore, the width W of the bottom of the squirrel-cage starting groove is 3.9mm, the length L of the groove body is 6mm, and the included angle alpha between the groove body and the bottom of the groove is 95 degrees. At this time, the motor can be started quickly and reaches the synchronous speed within 2-3 seconds.

And optimally, the vertical distance h between the groove top of the squirrel-cage starting groove and the edge of the rotor punching sheet is 1 mm. The squirrel-cage starting slots with specific specifications are arranged at the edge of the rotor punching sheet, the leakage loss of the rotor is low, the output efficiency of the motor can be further improved, and meanwhile, the adverse effects of the closed slot structure on the maximum torque of the motor, the slip ratio when the maximum torque occurs and the starting torque can be reduced.

To the rotor punching, the technical scheme of the utility model is that: a self-starting permanent magnet motor rotor punching sheet is characterized in that a shaft hole for mounting a rotating shaft is formed in the middle of the rotor punching sheet, a group of squirrel cage starting grooves are uniformly formed in the edge of the rotor punching sheet along the circumferential direction, and the squirrel cage starting grooves are pointed top and flat bottom grooves; a group of magnetic steel grooves for inserting magnetic steel are uniformly distributed on the inner side of the squirrel cage starting groove; a plurality of positioning holes are formed in the inner side of the magnetic steel groove; the inner wall of the shaft hole is provided with an inclined key groove, and the bottom of the inclined key groove is provided with an inclined plane.

Compared with the prior art, the rotor punching sheet of the self-starting permanent magnet motor has the advantages that the squirrel cage starting groove is designed, so that the permanent magnet motor can be directly started in a power grid manner without being provided with a special driver; the squirrel-cage starting groove is a pointed top flat bottom groove, so that the motor can be quickly started; through the design of the positioning holes, the magnetic steel slots can be aligned after the rotor is die-cast, so that the magnetic steel can be easily inserted; in addition, the inclined key groove is designed on the inner wall of the shaft hole, so that the most harmful harmonic waves in the air gap magnetic field can be eliminated or weakened, and the starting performance and the running performance of the motor are improved.

As optimization, 28 squirrel-cage starting grooves are uniformly formed in the edge of the rotor punching sheet along the circumferential direction; the squirrel-cage starting groove is 3.9mm in groove bottom width W, 6mm in groove body length L and 95 degrees in included angle alpha between the groove body and the groove bottom. At this time, the motor can be started quickly and reaches the synchronous speed within 2-3 seconds.

As optimization, the magnetic steel grooves are in a radial straight line shape, and a regular polygon is enclosed after all the magnetic steel grooves are connected; the middle part of the magnetic steel groove is rectangular, the left and right protruding end parts are triangular, and the left and right protruding end parts are symmetrically arranged. At the moment, the magnetic steel slot has a simple, compact and reasonable structure, the magnetic leakage of the magnetic steel can be controlled within a reasonable range under the condition of not influencing the rigidity of the rotor core and the trend of a magnetic circuit, the using amount of the magnetic steel is saved, the utilization rate of the magnetic steel is effectively improved, and the manufacturing cost of the motor is reduced.

Drawings

Fig. 1 is a schematic structural diagram of a self-starting permanent magnet motor rotor according to the present invention;

FIG. 2 is a view of the rotor A of the self-starting permanent magnet motor of FIG. 1;

fig. 3 is a schematic structural diagram of a self-starting permanent magnet motor rotor sheet of the present invention;

fig. 4 is a schematic size diagram of a self-starting permanent magnet motor rotor sheet of the present invention;

fig. 5 is a schematic size diagram of a squirrel cage starter slot according to the present invention;

fig. 6 is a schematic size diagram of the oblique key groove of the present invention.

The labels in the figures are: 1-rotor core, 11-rotor sheet, 111-shaft hole, 112-squirrel-cage starting groove, 113-magnetic steel groove, 114-positioning hole and 115-oblique key groove; 2-end ring, 21-balance column.

Detailed Description

The following description is made with reference to the accompanying drawings and examples, but not to be construed as limiting the invention.

Example (b):

referring to fig. 1 to 6, the self-starting permanent magnet motor rotor of the present invention includes a rotor core 1 formed by stacking rotor sheets 11 and end rings 2 (the thickness H of the end rings 2 is 7.6mm) disposed at two ends of the rotor core 1; 12 balance columns 21 are uniformly arranged on the end face of the end ring 2 along the circumferential direction (the center of each balance column 21 is located on the circumference with the diameter d4 of 65.5 mm); the middle part of the rotor punching sheet 11 is provided with a shaft hole 111 for mounting a rotating shaft, the edge of the rotor punching sheet 11 is uniformly provided with a group of squirrel cage starting grooves 112 along the circumferential direction, and the squirrel cage starting grooves 112 are tip-top flat grooves; a group of magnetic steel grooves 113 for inserting magnetic steel are uniformly distributed on the inner side of the squirrel cage starting groove 112; a plurality of positioning holes 114 are formed in the inner side of the magnetic steel groove 113; the inner wall of the shaft hole 111 is provided with an inclined key groove 115, and the bottom of the inclined key groove 115 is provided with an inclined surface.

The rotor in this embodiment is a cast aluminum rotor and the end ring 2 is an aluminum end ring. The cost and the processing difficulty can be reduced by selecting the cast aluminum. Of course, other metal materials, such as cast copper, etc., may be used as desired.

In this embodiment, the balancing column 21 is in the shape of a circular truncated cone, and has a top diameter d1 of 4mm and a bottom diameter d2 of 5 mm. The center line of the balance post 21 is positioned at the inner side of the end face of the end ring 2; the distance between the center line of the balance post 21 and the center line of the end face of the end ring 2 is 20-30% of the width of the end face of the end ring 2. The non-standard design that the inner side set up is leaned on to the stabilizer 21, compare in the standard design of locating the middle part, can avoid stabilizer 21 size when great, hang out for end ring 2 lateral surface to can avoid the enameled wire on the stator to be cut bad by stabilizer 21.

In this embodiment, the number of the magnetic steel grooves 113 is 4, and the magnetic steel grooves are in a radial shape, and the connection lines of the 4 magnetic steel grooves 113 enclose a square. At the moment, the magnetic flux leakage of the magnetic steel can be controlled within a reasonable range under the condition that the rigidity of the rotor core 1 and the trend of a magnetic circuit are not influenced, the using amount of the magnetic steel is saved, the utilization rate of the magnetic steel is effectively improved, and the manufacturing cost of the motor is reduced. Further, the middle of the magnetic steel slot 113 is rectangular (the rectangular length d5 is 34.8mm, the width d6 is 3.5mm), the left and right protruding end portions are both triangular, and the left and right protruding end portions are symmetrically arranged. At this time, the magnetic steel groove 113 has simple, compact and reasonable structure, is convenient to manufacture and is easy for batch production. Further, the width d7 of the magnetic isolation bridge arranged between the magnetic steel slots 113 is 2.2 mm. Thereby make the rotor punching have better magnetism effect of gathering, guarantee its magnetic leakage coefficient, further guarantee the utilization ratio of magnet steel, improve the power density and the moment of torsion density of motor to promote the work efficiency of motor.

In this embodiment, 28 squirrel-cage start grooves 112 are uniformly formed in the edge of the rotor sheet 11 along the circumferential direction. Further, the width W of the bottom of the squirrel cage starting groove 112 is 3.9mm, the length L of the groove body is 6mm, and the included angle α between the groove body and the bottom of the groove is 95 °. At this time, the motor can be started quickly and reaches the synchronous speed within 2-3 seconds.

In this embodiment, the vertical distance h between the top of the squirrel-cage start slot 112 and the edge of the rotor punching sheet 11 is 1 mm. The squirrel-cage starting slots 112 with the specific specification are arranged at the edge of the rotor punching sheet 11, the leakage loss of the rotor is low, the output efficiency of the motor can be further improved, and meanwhile, the adverse effects of the closed slot structure on the maximum torque of the motor, the slip ratio when the maximum torque occurs and the starting torque can be reduced.

Referring to fig. 3 to 6, in the self-starting permanent magnet motor rotor sheet of the present invention, a shaft hole 111 for installing a rotating shaft is provided in the middle of the rotor sheet 11 (the diameter d3 of the shaft hole 111 is 24mm), 28 mouse cage starting grooves 112 are uniformly provided along the circumferential direction on the edge of the rotor sheet 11, the mouse cage starting grooves 112 are flat-bottom grooves with a pointed top, the width W of the bottom of the flat-bottom groove with a pointed top is 3.9mm, the length L of the groove body is 6mm, and the included angle α between the groove body and the bottom of the groove is 95 °; the squirrel cage starting groove 112 is internally and uniformly provided with 4 magnetic steel grooves 113 for inserting magnetic steel, the magnetic steel grooves 113 are in a radial straight line shape, the 4 magnetic steel grooves 113 are connected and then enclose a square (two ends of each magnetic steel groove 113 are positioned on the circumference with the diameter d8 of 56.8 mm), the middle part of each magnetic steel groove 113 is rectangular, the left and right protruding end parts are triangular, and the left and right protruding end parts are symmetrically arranged; 2 positioning holes 114 are arranged on the inner side of the magnetic steel groove 113 (2 positioning holes 114 are positioned in a square surrounded by the magnetic steel groove 113 and are arranged diagonally; the diameter d9 of the positioning holes 114 is 2mm, and the centers of the two positioning holes 114 are positioned on the circumference with the diameter d10 of 39 mm); an inclined key groove 115 is formed in the inner wall of the shaft hole 111, and the bottom of the inclined key groove 115 is an inclined plane; the inclined key groove 115 comprises a short groove body and a long groove body which are parallel to each other, and an inclined groove bottom; the depth m1 of the short groove body is 2.3mm, the depth m2 of the long groove body is 3mm, and the width m3 of the short groove body and the long groove body is 5 mm.

The above general description of the invention and the description of its specific embodiments in this application should not be construed as limiting the scope of the invention. Those skilled in the art can add, reduce or combine the technical features disclosed in the general description and/or the specific embodiments (including the examples) to form other technical solutions within the scope of the present application according to the disclosure of the present application without departing from the components of the present invention.

Claims

1. A self-starting permanent magnet motor rotor comprises a rotor core (1) formed by overlapping rotor punching sheets (11) and end rings (2) arranged at two ends of the rotor core (1); the method is characterized in that: a group of balance columns (21) are arranged on the end face of the end ring (2) along the circumferential direction; the middle part of the rotor punching sheet (11) is provided with a shaft hole (111) for mounting a rotating shaft, a group of squirrel cage starting grooves (112) are uniformly formed in the edge of the rotor punching sheet (11) along the circumferential direction, and the squirrel cage starting grooves (112) are pointed top flat grooves; a group of magnetic steel grooves (113) for inserting magnetic steel are uniformly distributed on the inner side of the squirrel cage starting groove (112); a plurality of positioning holes (114) are formed in the inner side of the magnetic steel groove (113); the inner wall of the shaft hole (111) is provided with an inclined key groove (115), and the bottom of the inclined key groove (115) is provided with an inclined plane.

2. The self-starting permanent magnet motor rotor of claim 1, wherein: the balance column (21) is in a round table shape, and the diameter of the top of the balance column (21) is smaller than that of the bottom of the balance column (21).

3. The self-starting permanent magnet motor rotor of claim 1, wherein: the magnetic steel grooves (113) are in a radial straight line shape, and a regular polygon is enclosed after all the magnetic steel grooves (113) are connected.

4. The self-starting permanent magnet motor rotor of claim 3, wherein: the middle part of the magnetic steel groove (113) is rectangular, the left and right protruding end parts are triangular, and the left and right protruding end parts are symmetrically arranged.

5. The self-starting permanent magnet motor rotor of claim 1, wherein: 28 squirrel-cage starting grooves (112) are uniformly formed in the edge of the rotor punching sheet (11) along the circumferential direction.

6. The self-starting permanent magnet motor rotor according to claim 5, wherein: the squirrel-cage starting groove (112) is 3.9mm in groove bottom width W, 6mm in groove body length L, and the included angle alpha between the groove body and the groove bottom is 95 degrees.

7. The self-starting permanent magnet motor rotor according to claim 6, wherein: and the vertical distance h between the groove top of the squirrel-cage starting groove (112) and the edge of the rotor punching sheet (11) is 1 mm.

8. The utility model provides a self-starting permanent magnet motor rotor punching which characterized in that: the middle part of the rotor punching sheet (11) is provided with a shaft hole (111) for mounting a rotating shaft, a group of squirrel cage starting grooves (112) are uniformly formed in the edge of the rotor punching sheet (11) along the circumferential direction, and the squirrel cage starting grooves (112) are pointed top flat grooves; a group of magnetic steel grooves (113) for inserting magnetic steel are uniformly distributed on the inner side of the squirrel cage starting groove (112); a plurality of positioning holes (114) are formed in the inner side of the magnetic steel groove (113); the inner wall of the shaft hole (111) is provided with an inclined key groove (115), and the bottom of the inclined key groove (115) is provided with an inclined plane.

9. The rotor sheet of the self-starting permanent magnet motor according to claim 8, wherein: 28 squirrel-cage starting grooves (112) are uniformly formed in the edge of the rotor punching sheet (11) along the circumferential direction; the squirrel-cage starting groove (112) is 3.9mm in groove bottom width W2, 6mm in groove body length L, and an included angle alpha between the groove body and the groove bottom is 95 degrees.

10. The rotor sheet of the self-starting permanent magnet motor according to claim 8, wherein: the magnetic steel grooves (113) are in a radial straight line shape, and a regular polygon is enclosed after all the magnetic steel grooves (113) are connected; the middle part of the magnetic steel groove (113) is rectangular, the left and right protruding end parts are triangular, and the left and right protruding end parts are symmetrically arranged.