Efficient three-phase asynchronous motor

Abstract

The invention discloses a high-efficiency three-phase asynchronous motor, which comprises a stator and a rotor arranged in the stator, a shell is fixed on the peripheral side surface of the stator, a bearing and a front end cover are arranged at the front end of the shell, and a bearing, a rear end cover, fan blades and a fan blade cover are arranged at the rear end of the shell. The iron loss and the copper loss of the motor are reduced by optimizing parameters such as the slot size and the length-diameter ratio of the stator and the rotor, so that higher efficiency is obtained; the tooth harmonic amplitude is reduced by reasonably selecting the matching of stator and rotor slots and adopting the design of rotor skewed slots, so that the electromagnetic vibration and the electromagnetic noise are reduced; the size of the cooling fan and the form and location tolerance of stator and rotor parts are reasonably designed, mechanical vibration and noise are reduced, and the purpose of reducing the mechanical noise of the motor is achieved; by arranging a stator and rotor structure, proper stator and rotor slots need to be selected for matching for motors with different center heights, so that tooth harmonic waves and harmonic loss are reduced as much as possible; the size of the groove shape and the size of the stator yoke are optimized, and stator and rotor iron loss is reduced; the overall efficiency of the motor is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of motors, and in particular relates to a high-efficiency three-phase asynchronous motor. Background Art

[0002] Electromechanical transmission systems are essential key components in industrial automation equipment; the motor converts electrical energy into mechanical energy, reduces the speed and increases the torque through the reduction gearbox to drive the moving parts in the equipment; precise control and reliable performance can ensure that the system can work stably for a long time.

[0003] Today, countries around the world are striving for energy conservation and emission reduction, aiming to reduce the impact of human beings on the earth's environment and create a green future. As a major electricity consumer in the industrial field, electric motors must develop in the direction of lower energy consumption and higher efficiency. In 2021, the country has issued new energy efficiency standards, forcing the elimination of low-efficiency three-phase asynchronous motors, making IE3 high-efficiency motors the new standard. Therefore, it is necessary to develop an ultra-high-efficiency motor to further improve energy conversion efficiency, save more energy and reduce emissions, and make more contributions to my country's realization of carbon neutrality. Summary of the invention

[0004] The purpose of the present invention is to provide a high-efficiency three-phase asynchronous motor to solve the existing problems.

[0005] In order to solve the above technical problems, the present invention is achieved through the following technical solutions: The present invention is a high-efficiency three-phase asynchronous motor, comprising a stator and a rotor arranged inside the stator, wherein a shell is arranged on the circumferential side of the stator, and a plurality of heat dissipation ribs and three mounting strips are arranged equidistantly on the circumferential side of the shell, and threaded holes are provided on both opposite surfaces of the mounting strips, and a mounting seat and a terminal box are arranged on the circumferential side of the shell, and a through hole for mounting the rotor is arranged at the center of the stator, and a plurality of stator teeth protrude from the circumferential direction of the stator toward the through hole, and the stator teeth are distributed at equal intervals, and stator slots are formed between two adjacent stator teeth, and a notch is arranged at one end of the stator slot facing the through hole, and thirty-six stator slots are arranged, and the slot center angle between two adjacent stator slots is 10°; The rotor comprises a rotor winding, a rotor core and a rotating shaft. The rotor core is arranged in the rotor winding. The rotor core is a squirrel cage structure and is press-fitted with the rotating shaft. The rotor winding is made of copper bars embedded in rotor slots as conductors. The number of the copper bars is 28 and the copper bars are arranged equidistantly around the circumference. Both ends of the rotating shaft are sleeved with bearings, the left end of the bearing peripheral side is sleeved with a front end cover, and the right end of the bearing peripheral side is sleeved with a rear end cover, the front end cover and the rear end cover are both provided with bearing seats on one surface, a fan blade is provided on the right side of the rear end cover, the front end cover, the rear end cover and the fan blade center are all provided with mounting holes for mounting the rotating shaft, a fan blade cover is provided on the right side of the fan blade, a limit block is provided on the inner wall of the fan blade mounting hole, and the cross section of the limit block is a triangular structure; The front end cover is provided with a plurality of fixing platforms on the side surface, and a mounting screw hole is provided on one surface of the fixing platform, and the mounting screw hole is fixedly connected with the threaded hole by bolts; the rear end cover is provided with a mounting ear on the side surface, and a fixing hole is provided on one surface of the mounting ear, and a side mounting hole is provided in the fixing hole; the fan blade cover is provided with a side installation hole on the side surface, and the side installation hole is fixedly connected with the side installation hole by bolts; a plurality of heat dissipation holes are provided on one end surface of the fan blade cover; Bearing steps, limit steps and limit grooves are provided on both sides of the circumferential side surface of the rotating shaft. A groove is provided on the circumferential side surface of the rotating shaft at the right end of the fan blade, and a shaft stop is provided in the groove.

[0006] Furthermore, the stator is symmetrically arranged with the slot center line of the stator slot as the center.

[0007] Furthermore, the dynamic balancing process of the rotor adopts a weight removal method.

[0008] Furthermore, a mounting hole is provided on one surface of the mounting seat, and a reinforcing rib is fixed on the outer surface of the mounting seat.

[0009] Furthermore, the shape and size of the bearing step are adapted to the bearing, and the bearing step and the bearing cooperate with each other.

[0010] Furthermore, the shape and size of the limiting step are adapted to the fan blades, and the limiting step and the fan blades cooperate with each other.

[0011] Furthermore, the shape and size of the limiting block are adapted to the limiting groove, and the limiting block and the limiting groove cooperate with each other.

[0012] Furthermore, the rotor core is made of silicon steel material.

[0013] The present invention has the following beneficial effects: The present invention adopts high-performance and low-loss silicon steel materials and optimizes parameters such as the slot size and aspect ratio of the stator and rotor to reduce the iron loss and copper loss of the motor, thereby achieving higher efficiency.

[0014] The present invention reduces the amplitude of tooth harmonics by reasonably selecting the stator and rotor slot matching and adopting the rotor skew slot design, thereby reducing electromagnetic vibration and electromagnetic noise; at the same time, the cooling fan size and the shape and position tolerances of the stator and rotor components are reasonably designed to reduce mechanical vibration and noise, thereby achieving the purpose of reducing the mechanical noise of the motor.

[0015] The present invention sets a stator and rotor structure. For motors with different center heights, it is necessary to select appropriate stator and rotor slot combinations to minimize tooth harmonics and harmonic losses; optimize the slot size and stator yoke size, reasonably design the magnetic circuit, and reduce the stator and rotor iron losses; thereby improving the overall efficiency of the motor; and at the same time, reducing the electromagnetic vibration and electromagnetic noise of the motor.

[0016] The present invention sets the rotor core of the rotor as a squirrel cage structure and presses it into an integral whole with the rotating shaft; the rotor dynamic balancing process is very critical and directly affects the overall mechanical vibration, noise and bearing life of the motor; the dynamic balancing process of the present invention is a weight removal method, which requires 3000r / min to reach ISO21940 standard G2.5 level and can realize fully automatic production.

[0017] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0019] Figure 1 It is an exploded diagram of a high-efficiency three-phase asynchronous motor; Figure 2 It is a schematic diagram of the overall structure of a high-efficiency three-phase asynchronous motor; Figure 3 It is a left view of a high-efficiency three-phase asynchronous motor; Figure 4 for Figure 3 Middle AA section; Figure 5 for Figure 4 Middle BB section; Figure 6 This is an exploded diagram of a high-efficiency three-phase asynchronous motor from another perspective.

[0020] In the accompanying drawings, the components represented by the reference numerals are listed as follows: 1. stator; 2. rotor; 3. bearing; 4. front cover; 5. rear cover; 6. blade; 7. shaft stop; 8. housing; 9. blade cover; 101. through hole; 102. stator tooth; 103. stator slot; 104. notch; 200. rotor winding; 201. rotor core; 202. rotating shaft; 203. bearing step; 204. limiting step; 205. limiting slot; 401. bearing seat; 402. fixing table; 501. mounting ear; 601. limiting block; 801. heat dissipation rib; 802. mounting strip; 803. mounting seat; 804. junction box; 805. reinforcing rib; 806. threaded hole. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "upper", "middle", "outer", "inner" and the like indicating directions or positional relationships are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0023] In the description 401 of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "connected", etc. should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] See also Figure 1-6As shown, the present invention is a high-efficiency three-phase asynchronous motor, comprising a stator 1 and a rotor 2 arranged inside the stator 1. A shell 8 is arranged on the side surface of the stator 1. A plurality of heat dissipation ribs 801 and three mounting strips 802 are arranged equidistantly on the side surface of the shell 8. The design of the heat dissipation ribs 801 directly affects the heat dissipation effect of the motor and the air duct and wind resistance of the cooling fan blades; at the same time, it affects the appearance of the motor. The mounting strips 802 are provided with threaded holes 806 on both opposite surfaces. A mounting seat 803 and a terminal box 804 are provided on the surface. A through hole 101 for mounting the rotor is provided at the center of the stator 1. A plurality of stator teeth 102 protrude from the circumferential direction of the stator 1 toward the through hole 101. The stator teeth 102 are distributed at equal intervals. Stator slots 103 are formed between two adjacent stator teeth 102. A notch 104 is provided at one end of the stator slot 103 facing the through hole 101. There are thirty-six stator slots 103. The slot center angle between two adjacent stator slots 103 is 10°. The rotor 2 includes a rotor winding 200, a rotor core 201 and a rotating shaft 202. The rotor core 201 is arranged in the rotor winding 200. The rotor core 201 is a squirrel cage structure and is press-fitted with the rotating shaft 202. The rotor winding 200 is a conductor made of copper bars embedded in the rotor slots. The number of copper bars is 28 and the copper bars are arranged equidistantly around the circumference. The rotor slots adopt a rotor skew slot design. like Figure 5 As shown in the figure, for the structure of stator 1 and rotor 2, for motors with different center heights, it is necessary to select appropriate stator and rotor slot matching to minimize tooth harmonics and harmonic losses; optimize the slot size and stator yoke size, reasonably design the magnetic circuit, and reduce the stator and rotor iron losses; thereby improving the overall efficiency of the motor; at the same time, reducing the electromagnetic vibration and electromagnetic noise of the motor; By optimizing the slot size, aspect ratio and other parameters of the stator slot 103 and the rotor slot, the iron loss and copper loss of the motor are reduced, thereby obtaining a higher efficiency; by reasonably selecting the stator and rotor slots and adopting the rotor skew slot design, the tooth harmonic amplitude is reduced, thereby reducing electromagnetic vibration and electromagnetic noise.

[0025] Bearings 3 are sleeved on both ends of the rotating shaft 202, a front end cover 4 is sleeved on the side surface of the left end bearing 3, and a rear end cover 5 is sleeved on the side surface of the right end bearing 3. A bearing seat 401 is provided on one surface of the front end cover 4 and the rear end cover 5, and a fan blade 6 is provided on the right side of the rear end cover 5. The center positions of the front end cover 4, the rear end cover 5 and the fan blade 6 are all provided with mounting holes for mounting the rotating shaft 202, a fan blade cover 9 is provided on the right side of the fan blade 6, and a limit block 601 is provided on the inner wall of the mounting hole of the fan blade 6, and the cross-section of the limit block 601 is a triangular structure; the housing 8, as a part of the motor stator, is connected to the motor mounting seat 803, the front end cover 4, the rear end cover 5, and the terminal box 804 to fix the stator core, thereby realizing the torque transmission between the stator and the rotor.

[0026] A plurality of fixing platforms 402 are arranged on the side of the front end cover 4, and a surface of the fixing platform 402 is provided with mounting screw holes, and the mounting screw holes are fixedly connected with the threaded holes 806 by bolts; a mounting ear 501 is arranged on the side of the rear end cover 5, and a fixing hole is arranged on the surface of the mounting ear 501, and a side mounting hole is arranged in the fixing hole; a side installation hole is arranged on the side of the fan blade cover 9, and the side installation hole is fixedly connected with the side mounting hole by bolts; a plurality of heat dissipation holes are arranged on one end surface of the fan blade cover 9; Bearing steps 203, limiting steps 204 and limiting grooves 205 are provided on both sides of the side surface of the rotating shaft 202. A groove is provided on the side surface of the rotating shaft 202 at the right end of the fan blade 6, and a shaft stopper 7 is provided in the groove.

[0027] The stator 1 is symmetrically arranged with the center line of the slot opening 104 of the stator slot 103 as the center.

[0028] The dynamic balancing process of the rotor 2 adopts a weight removal method, which directly affects the overall mechanical vibration and noise of the motor and the life of the bearing.

[0029] A mounting hole is provided on one surface of the mounting seat 803 , and a reinforcing rib 805 is fixed on the outer surface of the mounting seat 803 .

[0030] The shape and size of the bearing step 203 are adapted to the bearing 3 , and the bearing step 203 and the bearing 3 cooperate with each other.

[0031] The shape and size of the limiting step 204 are adapted to the fan blade 6 , and the limiting step 204 and the fan blade 6 cooperate with each other.

[0032] The shape and size of the limiting block 601 are adapted to the limiting groove 205 , and the limiting block 601 and the limiting groove 205 cooperate with each other.

[0033] The rotor core 201 is made of high-performance, low-loss silicon steel material.

[0034] It should be further explained that the present invention adopts a modular design to meet the various application requirements of customers; this is mainly reflected in the structural design of the rotor, in which the length of the reverse shaft end can be changed to accommodate the installation of different optional accessories.

[0035] The present invention adopts higher specification electromagnetic copper wire (C grade), insulation material system (H grade) and imported bearings; at the same time, due to the advantages of high efficiency and low temperature rise, the rated operating temperature of the motor is low, so that the motor has better reliability and longer life.

[0036] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A high-efficiency three-phase asynchronous motor, comprising a stator (1) and a rotor (2) arranged inside the stator (1), characterized in that: The stator (1) is provided with a shell (8) on the circumferential side surface, and a plurality of heat dissipation ribs (801) and three mounting strips (802) are equidistantly arranged on the circumferential side surface of the shell (8), and threaded holes (806) are provided on both opposite surfaces of the mounting strip (802). The shell (8) is provided with a mounting seat (803) and a terminal box (804) on the circumferential side surface, and a through hole (101) for mounting a rotor is provided at the center of the stator (1), and a plurality of stator teeth (102) protrude from the through hole (101) in the circumferential direction of the stator (1), and the stator teeth (102) are distributed at equal intervals, and stator slots (103) are formed between two adjacent stator teeth (102), and a notch (104) is provided at one end of the stator slot (103) facing the through hole (101), and thirty-six stator slots (103) are provided, and the slot center angle between two adjacent stator slots (103) is 10°; The rotor (2) comprises a rotor winding (200), a rotor core (201) and a rotating shaft (202); the rotor core (201) is arranged in the rotor winding (200); the rotor core (201) is a squirrel cage structure and is press-fitted with the rotating shaft (202); the rotor winding (200) uses copper bars embedded in rotor slots as conductors; the number of the copper bars is twenty-eight and the copper bars are arranged equidistantly around the circumference; Both ends of the rotating shaft (202) are sleeved with bearings (3); a front end cover (4) is sleeved on the side surface of the bearing (3) at the left end, and a rear end cover (5) is sleeved on the side surface of the bearing (3) at the right end; a bearing seat (401) is provided on one surface of the front end cover (4) and the rear end cover (5); a fan blade (6) is provided on the right side of the rear end cover (5); a mounting hole for mounting the rotating shaft (202) is provided at the center of the front end cover (4), the rear end cover (5) and the fan blade (6); a fan blade cover (9) is provided on the right side of the fan blade (6); a limit block (601) is provided on the inner wall of the mounting hole of the fan blade (6); and the cross section of the limit block (601) is a triangular structure; The front end cover (4) is provided with a plurality of fixing platforms (402) on the circumferential side surface, and a surface of the fixing platform (402) is provided with mounting screw holes, and the mounting screw holes are fixedly connected to the threaded holes (806) by bolts; the rear end cover (5) is provided with mounting ears (501) on the circumferential side surface, and a fixing hole is provided on a surface of the mounting ears (501), and a side mounting hole is provided in the fixing hole; the fan blade cover (9) is provided with a side installation hole on the circumferential side surface, and the side installation hole is fixedly connected to the side mounting hole by bolts; and a plurality of heat dissipation holes are provided on one end surface of the fan blade cover (9); A bearing step (203), a limit step (204) and a limit groove (205) are provided on both sides of the peripheral side surface of the rotating shaft (202), and a groove is provided on the peripheral side surface of the rotating shaft (202) at the right end of the fan blade (6), and a shaft stopper (7) is provided in the groove.

2. A high-efficiency three-phase asynchronous motor according to claim 1, characterized in that: The stator (1) is symmetrically arranged with the center line of the slot opening (104) of the stator slot (103) as the center.

3. A high-efficiency three-phase asynchronous motor according to claim 1, characterized in that: The dynamic balancing process of the rotor (2) adopts a weight removal method.

4. A high-efficiency three-phase asynchronous motor according to claim 1, characterized in that: A mounting hole is provided on one surface of the mounting seat (803), and a reinforcing rib (805) is fixed on the outer surface of the mounting seat (803).

5. The high-efficiency three-phase asynchronous motor according to claim 1, characterized in that: The shape and size of the bearing step (203) are compatible with the bearing (3), and the bearing step (203) and the bearing (3) cooperate with each other.

6. A high-efficiency three-phase asynchronous motor according to claim 1, characterized in that: The shape and size of the limiting step (204) are compatible with the fan blade (6), and the limiting step (204) and the fan blade (6) cooperate with each other.

7. A high-efficiency three-phase asynchronous motor according to claim 1, characterized in that: The shape and size of the limiting block (601) are compatible with the limiting groove (205), and the limiting block (601) and the limiting groove (205) cooperate with each other.

8. The high-efficiency three-phase asynchronous motor according to claim 1, characterized in that: The rotor core (201) is made of silicon steel.

Images