Novel motor rotor punching sheet, and rotor and motor manufactured by adopting rotor punching sheet
The novel motor rotor punching with a composite slot structure and ventilation holes addresses inefficiencies in high-power motors by reducing burrs, stray loss, and noise, enhancing starting torque and efficiency, and extending service life.
Patent Information
- Application Number
- CN202420935699.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2034-04-30
AI Technical Summary
High-power motors with open knife-shaped slot structures experience issues such as poor harmonic magnetic field elimination, low efficiency, increased noise, high stray loss, and reduced service life due to excessive starting current, which leads to motor burn and high maintenance costs.
A novel motor rotor punching design featuring a composite slot structure with isosceles trapezoidal, rectangular, and semicircular grooves, including two open slots and ventilation holes, to reduce burrs, stray loss, and enhance heat dissipation, while improving starting torque and motor efficiency.
The new design reduces burrs, stray loss, and noise, enhances starting torque, and improves motor efficiency and service life by effectively managing harmonic magnetic fields and heat dissipation.
Smart Images
Figure CN222262279U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of motors, in particular to a novel motor rotor punching sheet and a rotor and a motor made by adopting the rotor punching sheet. Background Art
[0002] A motor is an electromagnetic device that realizes the conversion or transmission of electric energy according to the law of electromagnetic induction. It is composed of a stator, a rotor and other accessories. The rotor is the rotating part of the motor, including the rotor core, rotor winding and shaft. The rotor core is made of stacked rotor laminations. At present, for high-power motors, excessive starting current will cause serious impact on the rotor winding and even burn the motor. Therefore, the lamination slots of the rotor laminations of high-power motors are generally designed as open knife-shaped slot structures (see Figure 1 ). However, when the rotor punching adopts the above slot structure, the motor will have a poor effect in eliminating harmonic magnetic fields, low motor efficiency, and when the motor is under load operation, there are also defects such as increased motor temperature, high noise, and high stray loss, which shortens the service life of the motor and increases maintenance costs. Utility Model Content
[0003] In order to overcome the above-mentioned problems existing in the prior art, the present application provides a new type of motor rotor punching. In the new type of motor rotor punching of the present application, the rotor punching slot adopts a specific composite slot structure, and two of them are open slots, and the rest are closed slots, so that the generation of burrs can be effectively reduced during processing, and the stray loss of the motor can be reduced. At the same time, the motor has a higher starting torque, which can weaken the influence of the high-order harmonics of the inverter on the vibration of the motor, reduce the motor noise, and improve the efficiency of the motor; and the rotor punching includes two open slots, which can be used for exhaust during aluminum casting to improve the internal quality of the rotor cast aluminum; in addition, ventilation holes are designed on the rotor punching to facilitate ventilation and heat dissipation of the motor, reduce the temperature rise of the motor, and increase the service life of the motor. Correspondingly, the present application also provides a rotor and a motor made using the new type of motor rotor punching.
[0004] For rotor punching, the technical solution of this application is:
[0005] A novel motor rotor punching comprises a rotor punching body; an axial hole for installing a rotating shaft is provided in the middle of the rotor punching body, and a keyway is provided on the inner wall of the axial hole; a group of rotor punching grooves are evenly spaced along the circumferential direction on the edge of the rotor punching body; the rotor punching grooves are composed of isosceles trapezoidal grooves, rectangular grooves and semicircular grooves connected in sequence; wherein, the top ends of the semicircular grooves in the two rotor punching grooves symmetrically arranged on both sides of the axial hole are provided with notches to form open grooves, and the remaining rotor punching grooves are all closed grooves; the isosceles trapezoidal groove is a structure that is narrow inside and wide outside; the width of the rectangular groove is the same as the diameter of the semicircular groove; a group of ventilation holes are evenly distributed along the circumferential direction on the annular surface between the rotor punching groove and the axial hole.
[0006] Compared with the prior art, in the novel motor rotor punching of the present application, the rotor punching slot adopts a composite slot structure composed of isosceles trapezoidal slots, rectangular slots and semicircular slots, and two of them are open slots, and the rest are closed slots, so that the generation of burrs can be effectively reduced during processing, and the stray loss of the motor can be reduced. At the same time, the motor has a higher starting torque, which can weaken the influence of the inverter's high-order harmonics on the motor vibration, reduce the motor noise, and improve the motor efficiency; and the rotor punching includes two open slots, which can be used for exhaust during aluminum casting, reduce the amount of air wrapped in aluminum bars and aluminum rings, and improve the internal quality of the rotor cast aluminum; in addition, ventilation holes are designed on the rotor punching, so that part of the heat consumed by the rotor can be taken away through the ventilation holes, which is convenient for ventilation and heat dissipation of the motor, reduces the temperature rise of the motor, and increases the service life of the motor.
[0007] As an optimization, in the aforementioned new motor rotor punching sheet, the inner side length of the isosceles trapezoidal groove is greater than the diameter of the semicircular groove; the size of the notch is smaller than the radius of the semicircular groove; the width w of the rectangular groove can be 3 to 7 mm, the height H1 can be 11 to 15 mm; the height H2 of the isosceles trapezoidal groove can be 36 to 48 mm. At this time, the magnetic density distribution can be more uniform, and the motor power density can be better improved.
[0008] As an optimization, in the aforementioned novel motor rotor sheet, the vertical distance h between the top of the semicircular groove and the edge of the rotor sheet can be 1.5-2 mm. At this time, the rotor sheet groove is close to the edge of the rotor sheet, so that the rotor leakage magnetic loss is low, which can further improve the efficiency of the motor.
[0009] As an optimization, in the aforementioned novel motor rotor punching sheet, two keyways are symmetrically arranged on the inner wall of the shaft hole, one of which is an oblique keyway and the other is a flat keyway. Therefore, when laminating, the front and back sides of the rotor punching sheet can be identified according to the position of the oblique keyway, so that the burr direction of the rotor punching sheet is consistent, and the flatness of the rotor core after lamination is improved.
[0010] As an optimization, in the aforementioned novel motor rotor punching, 60 rotor punching slots and 12 ventilation holes are evenly spaced on the rotor punching body.
[0011] For the rotor, the technical solution of this application is:
[0012] The rotor comprises a rotor core and a rotating shaft arranged in the middle of the rotor core; the rotor core is made by stacking the aforementioned novel motor rotor punching sheets of the present application.
[0013] As an optimization, in the aforementioned rotor, end rings are respectively provided at both ends of the rotor core; and a group of balancing columns are provided on the end faces of the end rings at intervals along the circumferential direction. Thus, the dynamic balancing performance of the rotor can be improved, making the rotor more stable, less noisy, and more evenly heated when rotating at high speed, thereby extending its service life.
[0014] For the motor, the technical solution of this application is:
[0015] The motor comprises a housing, and a stator and a rotor arranged in the housing; the rotor comprises a rotor core and a rotating shaft arranged in the middle of the rotor core; the rotor core is made by stacking the aforementioned novel motor rotor punching sheets of the present application.
[0016] Compared with the prior art, the motor of the present application is made of a new type of motor rotor punching, which is provided with rotor punching grooves of a specific structure (composed of isosceles trapezoidal grooves, rectangular grooves and semicircular grooves, two of which are open slots and the rest are closed slots) and multiple ventilation holes, so that the motor has the advantages of low temperature rise, low stray loss and high efficiency.
[0017] As an optimization, in the aforementioned motor, a wind shield is provided at the rear end of the housing; an external fan is provided inside the wind shield; an internal fan and a wind shield are provided at the rear end of the rotating shaft. When the rotating shaft rotates, the internal fan, the wind shield and the external fan are driven to rotate; due to the obstruction of the wind shield, the internal heat is dissipated through the ventilation holes provided on the rotor punching; under the rotation of the external fan, the external air enters through the air inlet on the wind shield; through the mutual cooperation of the internal fan and the external fan, the air intake and exhaust capacity of the motor can be balanced, thereby improving the heat dissipation capacity of the motor. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] Figure 1 It is a schematic diagram of the structure of a rotor punching sheet in the prior art;
[0019] Figure 2 It is a structural schematic diagram of the novel motor rotor punching sheet of the present application;
[0020] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in FIG.
[0021] Figure 4 It is a dimension drawing of the rotor punching slot in this application;
[0022] Figure 5 It is a schematic diagram of the structure of the rotor of the present application;
[0023] Figure 6 It is a schematic diagram of the structure of the motor of the present application.
[0024] The markings in the accompanying drawings are: 1-rotor core, 11-rotor punching body, 111-axis hole, 112-isosceles trapezoidal groove, 113-rectangular groove, 114-semicircular groove, 115-notch, 116-ventilation hole, 117-oblique keyway, 118-flat keyway; 2-rotating shaft; 3-end ring, 31-balance column; 4-housing; 5-stator; 6-wind cover; 7-external fan; 8-internal fan; 9-wind shield. DETAILED DESCRIPTION
[0025] The present application is further described below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the present application.
[0026] Example (see Figure 2 to Figure 4 ):
[0027] A novel motor rotor sheet comprises a rotor sheet body 11; an axial hole 111 for mounting a rotating shaft 2 is provided in the middle of the rotor sheet body 11, and a keyway is provided on the inner wall of the axial hole 111; 60 rotor sheet grooves are evenly spaced along the circumferential direction on the edge of the rotor sheet body 11; the rotor sheet grooves are composed of isosceles trapezoidal grooves 112, rectangular grooves 113 and semicircular grooves 114 connected in sequence; wherein, the top ends of the semicircular grooves 114 in the two rotor sheet grooves symmetrically arranged on both sides of the axial hole 111 are provided with notches 115, thereby forming open grooves, and the remaining rotor sheet grooves are all closed grooves; the isosceles trapezoidal groove 112 is a structure that is narrow inside and wide outside; the width of the rectangular groove 113 is the same as the diameter of the semicircular groove 114; and 12 ventilation holes 116 are evenly distributed along the circumferential direction on the annular surface between the rotor sheet groove and the axial hole 111.
[0028] In this embodiment, the inner side length of the isosceles trapezoidal groove 112 is greater than the diameter of the semicircular groove 114 ; and the size of the notch 115 is smaller than the radius of the semicircular groove 114 .
[0029] In this embodiment, the width w of the rectangular groove 113 is 4.8 mm, and the height H1 is 12.5 mm; the height H2 of the isosceles trapezoidal groove 112 is 41.5 mm; the outer end side length L1 of the isosceles trapezoidal groove 112 is 11 mm, and the inner end side length L2 is 5.2 mm. At this time, the magnetic density distribution can be made more uniform, which is convenient for better improving the power density of the motor. Furthermore, the vertical distance h between the top of the semicircular groove 114 and the edge of the rotor punching is 1.7 mm, and the width d of the notch 115 is 2 mm. At this time, the rotor punching groove is close to the edge of the rotor punching, so that the rotor leakage magnetic loss is low, which can further improve the efficiency of the motor.
[0030] In this embodiment, two keyways are symmetrically arranged on the inner wall of the shaft hole 111, one of which is an oblique keyway 117 and the other is a flat keyway 118. Therefore, when laminating, the front and back sides of the rotor punching can be identified according to the position of the oblique keyway 117, so that the burr direction of the rotor punching is consistent, and the flatness of the rotor core 1 after lamination is improved; and the bottom of the oblique keyway 117 is inclined, so that there is a bevel transition on both side walls of the oblique keyway 117, which can effectively release the stress on the oblique keyway 117.
[0031] In this embodiment, each ventilation hole 116 is a circular hole, and the diameter of each ventilation hole 116 is 30 mm; two adjacent ventilation holes 116 are symmetrically arranged along the radial direction, and the center of each ventilation hole 116 is distributed on a circle with a diameter of 230 mm.
[0032] As a specific application of the new motor rotor punching sheet of this embodiment:
[0033] The motor comprises a housing 4, and a stator 5 and a rotor arranged in the housing 4; the rotor comprises a rotor core 1 and a rotating shaft 2 arranged in the middle of the rotor core 1; the rotor core 1 is made by stacking the new motor rotor punching sheets in this embodiment.
[0034] As a specific embodiment of a motor:
[0035] See also Figure 5 The two ends of the rotor core 1 are provided with end rings 3 respectively; a group of balancing columns 31 are provided on the end surface of the end ring 3 at intervals along the circumferential direction. In this way, the dynamic balancing performance of the rotor can be improved, making the rotor more stable, less noisy, and more evenly heated when rotating at high speed, thereby extending its service life.
[0036] See also Figure 6, the rear end of the housing 4 is provided with a wind shield 6; the wind shield 6 is provided with an external fan 7; the rear end of the rotating shaft 2 is provided with an internal fan 8 and a wind shield 9. When the rotating shaft 2 rotates, the internal fan 8, the wind shield 9 and the external fan 7 are driven to rotate; due to the obstruction of the wind shield 9, the internal heat is dissipated through the ventilation holes 116 provided on the rotor punching; under the rotation of the external fan 7, the external air enters through the air inlet on the wind shield 6; at this time, under the mutual cooperation of the internal fan 8 and the external fan 7, the air intake and exhaust capacity of the motor can be balanced, the heat dissipation capacity of the motor is further improved, and the temperature rise of the motor is reduced.
[0037] The above general description of the utility model involved in this application and the description of its specific implementation method should not be understood as limiting the technical solution of the utility model. Based on the disclosure of this application, those skilled in the art can add, reduce or combine the disclosed technical features in the above general description or / and the specific implementation method (including examples) without violating the constituent elements of the utility model involved, to form other technical solutions within the scope of protection of this application.
Claims
1. A novel motor rotor sheet, comprising a rotor sheet body (11); a shaft hole (111) for mounting a rotating shaft (2) is provided in the middle of the rotor sheet body (11); a keyway is provided on the inner wall of the shaft hole (111); a group of rotor sheet slots are evenly spaced along the circumferential direction on the edge of the rotor sheet body (11); the characteristics are: The rotor punching grooves are composed of an isosceles trapezoidal groove (112), a rectangular groove (113) and a semicircular groove (114) connected in sequence; wherein, the top ends of the semicircular grooves (114) in the two rotor punching grooves symmetrically arranged on both sides of the shaft hole (111) are provided with notches (115) to form open grooves, and the remaining rotor punching grooves are all closed grooves; the isosceles trapezoidal groove (112) is a structure that is narrow inside and wide outside; the width of the rectangular groove (113) is the same as the diameter of the semicircular groove (114); and a group of ventilation holes (116) are evenly distributed along the circumferential direction on the annular surface between the rotor punching groove and the shaft hole (111).
2. The novel motor rotor punching sheet according to claim 1 is characterized in that: The inner end side length of the isosceles trapezoidal groove (112) is greater than the diameter of the semicircular groove (114); and the size of the notch (115) is smaller than the radius of the semicircular groove (114).
3. The novel motor rotor punching sheet according to claim 2 is characterized in that: The width w of the rectangular groove (113) is 3 to 7 mm, and the height H1 is 11 to 15 mm; the height H2 of the isosceles trapezoidal groove (112) is 36 to 48 mm.
4. The novel motor rotor punching sheet according to claim 3 is characterized in that: The vertical distance h between the top of the semicircular groove (114) and the edge of the rotor punching sheet is 1.5 to 2 mm.
5. The novel motor rotor punching sheet according to claim 1 is characterized in that: Two key grooves are symmetrically arranged on the inner wall of the shaft hole (111), one of which is an oblique key groove (117) and the other is a flat key groove (118).
6. The novel motor rotor punching sheet according to any one of claims 1 to 5, characterized in that: The rotor punching body (11) is evenly spaced with 60 rotor punching slots and 12 ventilation holes (116).
7. A rotor, comprising a rotor core (1) and a rotating shaft (2) arranged in the middle of the rotor core (1); characterized in that: The rotor core (1) is made by stacking the new motor rotor punching sheets described in claim 1.
8. The rotor according to claim 7, characterized in that: End rings (3) are respectively provided at both ends of the rotor core (1); and a group of balancing columns (31) are provided at intervals along the circumferential direction on the end surfaces of the end rings (3).
9. A motor, comprising a housing (4), and a stator (5) and a rotor arranged in the housing (4); the rotor comprising a rotor core (1) and a rotating shaft (2) arranged in the middle of the rotor core (1); characterized in that: The rotor core (1) is made by stacking the new motor rotor punching sheets described in claim 1.
10. The motor according to claim 9, characterized in that: The rear end of the housing (4) is provided with a wind shield (6); an external fan (7) is provided inside the wind shield (6); and the rear end of the rotating shaft (2) is provided with an internal fan (8) and a wind shield (9).