Permanent magnet motor structure

Abstract

The utility model discloses a permanent magnet motor structure, which comprises a casing, a front cover and a rear cover which are correspondingly mounted at two ends of the casing, and a front bearing and a rear bearing which are correspondingly mounted in the front cover and the rear cover, a rotating shaft is rotatably connected between the front bearing and the rear bearing, a rotor is coaxially mounted on the rotating shaft, a first end of the rotating shaft extends out of the front cover along the axial direction, and a second end of the rotating shaft extends out of the rear cover along the axial direction. A plurality of magnetic steel grooves which are regularly distributed in the axial direction are formed in the rotor, magnetic steel pieces are inserted into the magnetic steel grooves, balance rings are installed at the two ends of the rotor and fix the two ends of the magnetic steel pieces, and an oil seal is installed in the front cover. The oil seal is sleeved on the rotating shaft at the front end of the front bearing; a bearing gland is sleeved on the rotating shaft at the rear end of the front bearing; the motor is high in concentricity, can avoid or reduce the movement of the rotating shaft, is good in heat dissipation, waterproof and dustproof performances, and is convenient to install and disassemble.

Description

Technical Field

[0001] The utility model relates to the technical field of motors, in particular to a permanent magnet motor structure. Background Art

[0002] Permanent magnet motors use permanent magnets to provide excitation, making the motor structure simpler, reducing processing and assembly costs, eliminating collector rings and brushes that are prone to problems, and improving the reliability of motor operation; no excitation current is required, there is no excitation loss, and the efficiency and power density of the motor are improved. Permanent magnet motors are composed of components such as stators, rotors, and end covers. The stator is basically the same as an ordinary induction motor, and a laminated structure is used to reduce the iron loss during motor operation. The rotor can be made solid or laminated. The armature winding can be a concentrated full-pitch winding, or a distributed short-pitch winding and an unconventional winding.

[0003] The permanent magnet motors in existing designs have some or all of the following deficiencies: (1) The two ends of the casing are not tightly connected to the front cover and the rear cover, and the concentricity is poor, which is not conducive to the dimensional stability of the bearing chamber; (2) The shaft is prone to movement; (3) The magnets are easily installed incorrectly, and the concentricity of the magnets after installation is poor; (3) The heat dissipation performance of the motor is poor; (4) The rotor cannot be dynamically balanced; (5) Installation and disassembly are relatively troublesome; (6) The waterproof and dustproof performance is poor. Utility Model Content

[0004] In order to overcome at least one of the technical problems existing in the prior art, the utility model provides a permanent magnet motor structure with high concentricity, which can avoid or reduce the movement of the shaft, has good heat dissipation, waterproof and dustproof performance, and is convenient to install and disassemble.

[0005] A permanent magnet motor structure comprises a casing, a front cover and a rear cover correspondingly mounted at two ends of the casing, a front bearing and a rear bearing correspondingly mounted in the front cover and the rear cover, a rotating shaft rotatably connected between the front bearing and the rear bearing, a rotor coaxially mounted on the rotating shaft, a first end of the rotating shaft axially extending to the outside of the front cover, the rear bearing and the second end of the rotating shaft are sealed in the rear cover and are not connected to the outside of the rear cover, a plurality of magnetic steel grooves regularly distributed along the axial direction are opened in the rotor, a magnetic steel piece is inserted in each magnetic steel groove, a balance ring is installed at both ends of the rotor to fix the two ends of the magnetic steel piece, an oil seal is installed in the front cover, the oil seal is sleeved on the rotating shaft at the front end of the front bearing, a bearing pressure cover is sleeved on the rotating shaft at the rear end of the front bearing, at least two through holes are correspondingly opened on the end faces of the front cover and the bearing pressure cover, a fastener is inserted in each through hole, the fastener fastens the front cover and the bearing pressure cover together, and the bearing pressure cover and the outer ring of the front bearing are tightly fitted surface to surface.

[0006] In some embodiments, the casing is an aluminum casing, the front cover and the rear cover are cast iron covers, outer stoppers are provided at both ends of the casing, and inner stoppers are provided on the front cover and the rear cover respectively. The outer stoppers at both ends of the casing are correspondingly inserted into the inner stoppers of the front cover and the rear cover and fixed.

[0007] In some embodiments, a first positioning portion is provided in each magnetic steel slot. In two adjacent magnetic steel slots, one of the first positioning portions is located on the magnetic steel slot surface close to the outer diameter of the rotor, and the other first positioning portion is located on the magnetic steel slot surface away from the outer diameter of the rotor; a second positioning portion corresponding to the first positioning portion is provided on the magnetic steel parts of different magnetic poles.

[0008] In some embodiments, the first positioning portion is a convex strip extending along the length direction of the magnetic steel slot, and the second positioning portion is a groove extending along the length direction of the magnetic steel piece. The grooves on the magnetic steel pieces of different magnetic poles are located on different surfaces of the magnetic steel piece.

[0009] In some embodiments, a balancing weight column is axially mounted on the end surface of each balancing ring.

[0010] In some embodiments, a fan blade is axially mounted on the end surface of at least one balancing ring, and heat dissipation holes that penetrate each other are axially opened on the rotor and the balancing ring.

[0011] In some embodiments, a positioning key is provided on the outer wall of the rotating shaft, and a key slot corresponding to the positioning key is opened on the balance ring and the center hole of the rotor. The rotor includes multiple silicon steel sheets stacked together, and the multiple silicon steel sheets are fixed by locking members.

[0012] In some embodiments, a plurality of balancing ring blind holes are formed on each balancing ring close to the rotor end, and the plurality of balancing ring blind holes are evenly distributed along the axial direction and correspond to the positions of the locking members.

[0013] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0015] Figure 1 It is a schematic diagram of the main appearance of this application;

[0016] Figure 2 yes Figure 1 The split structure diagram of

[0017] Figure 3 is a schematic diagram of the rear view appearance of the present application;

[0018] Figure 4 yes Figure 3 The split structure diagram of

[0019] Figure 5 This is a schematic diagram of the appearance of the present application after removing the front cover, rear cover and housing;

[0020] Figure 6 yes Figure 5 The split structure diagram of

[0021] Figure 7 yes Figure 5 Schematic diagram of the appearance after removing the oil seal, front bearing, bearing gland, nut and rear bearing;

[0022] Figure 8 yes Figure 7 The split structure diagram of

[0023] Fig. 9 This is a disassembled structural diagram of the rotor of the present application.

[0024] Reference numerals:

[0025] Casing 1, outer stop 100, inner stop 230;

[0026] Front cover 2, rear cover 3, front bearing 200, rear bearing 300, rear bearing mounting blind hole 301;

[0027] Rotating shaft 4, positioning key 400, key slot 950, heat dissipation hole 951;

[0028] Rotor 5, magnetic steel slot 500, magnetic steel member 501, first positioning portion 502, second positioning portion 503, locking member 504, balancing ring blind hole 505;

[0029] Oil seal 6, bearing cover 7, through hole 8, balance ring 9, balance weight column 900, fan blade 901, nut 10. DETAILED DESCRIPTION

[0030] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0031] In the description of the present invention, it should be understood that descriptions involving orientation, such as the orientations or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside", etc., are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0032] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it 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.

[0034] Reference Figure 1-Figure 9A permanent magnet motor structure includes a housing 1, a front cover 2 and a rear cover 3 correspondingly mounted at two ends of the housing 1, a front bearing 200 and a rear bearing 300 correspondingly mounted in the front cover 2 and the rear cover 3, a rotating shaft 4 is rotatably connected between the front bearing 200 and the rear bearing 300, a rotor 5 is coaxially mounted on the rotating shaft 4, a first end of the rotating shaft 4 extends axially to the outside of the front cover 2, and the second end of the rear bearing 300 and the rotating shaft 4 is sealed in the rear cover 3 and is not connected to the outside of the rear cover 3. Specifically, a hole is opened on the rear cover 3. A rear bearing installation blind hole 301 is provided, and the rear bearing 300 is installed in the blind hole, which can prevent liquid and dust from entering the housing 1 from the rear cover 3 and the outside of the housing 1; a plurality of through magnetic steel grooves 500 regularly distributed along the axial direction are provided in the rotor 5, and a magnetic steel piece 501 is inserted into each magnetic steel groove 500, both of which are rectangular. Balance rings 9 are installed at both ends of the rotor 5 and the two ends of the magnetic steel piece 501 are fixed. The magnetic steel piece 501 adopts the embedded structure, which is equivalent to sticking the magnetic steel on the surface of the rotor 5. It can improve the rigidity of the motor rotor 5 and increase the speed. An annular oil seal 6 is installed in the front cover 2. The oil seal 6 is sleeved on the rotating shaft 4 at the front end of the front bearing 200 to prevent liquid and dust from entering the housing 1 from the front cover 2 and the housing 1. A bearing cover 7 is sleeved on the rotating shaft 4 at the rear end of the front bearing 200. Three evenly distributed through holes 8 are correspondingly opened on the end faces of the front cover 2 and the bearing cover 7. A fastener is inserted into each through hole 8. The fastener fastens the front cover 2 and the bearing cover 7 together. The bearing cover 7 and the outer ring of the front bearing 200 are tightly fitted surface to surface, and the inner ring of the front bearing 200 can rotate. The fasteners can be screws, bolts or screws, etc. Three evenly distributed through holes 8 are convenient for locking the bearing cover 7 from the outside, and installation and disassembly are convenient. The bearing cover 7 limits the bearing in the axial position, effectively reducing the movement of the rotating shaft 4. In addition, a nut 10 is sleeved and fixed on the rotating shaft 4 between the rear bearing 300 and the adjacent balance ring 9 to prevent the rotor 5 and the balance ring 9 from axial movement.

[0035] In some embodiments, the casing 1 is an aluminum casing, and the front cover 2 and the rear cover 3 are cast iron covers. Circular outer stoppers 100 are provided at both ends of the casing 1, and circular inner stoppers 230 are correspondingly provided on the front cover 2 and the rear cover 3. The outer stopper 100 is a circular convex ring, and the inner stopper 230 is a circular groove. The outer stoppers 100 at both ends of the casing 1 are correspondingly inserted into and fixed in the inner stoppers 230 of the front cover 2 and the rear cover 3; the aluminum casing 1 has a large expansion coefficient, and the expansion coefficients of the front cover 2 and the rear cover 3 made of cast iron material are relatively small compared to the aluminum casing 1, which is beneficial to the dimensional stability of the bearing chamber. Even if the temperature of the motor is high, the bearing can be guaranteed not to run away from the outer ring. When the motor heats up normally, the inner stopper 230 and the outer stopper 100 will fit more and more closely, which is beneficial to ensuring concentricity and improving sealing performance, and is waterproof and dustproof.

[0036] In some embodiments, a first positioning portion 502 is provided in each magnetic steel slot 500. In two adjacent magnetic steel slots 500, one first positioning portion 502 is located on the surface of the magnetic steel slot 500 close to the outer diameter of the rotor 5, and the other first positioning portion 502 is located on the surface of the magnetic steel slot 500 away from the outer diameter of the rotor 5, that is, symmetrically arranged on two surfaces; a second positioning portion 503 corresponding to the first positioning portion 502 is provided on the magnetic steel parts 501 of different magnetic poles, and the second positioning portion 503 on the magnetic steel parts 501 of the same magnetic pole is located on the same surface, and the second positioning portion 503 on the magnetic steel parts 501 of the other magnetic pole is located on the same surface on the opposite side. Rapid installation can be achieved and wrong installation of the magnetic steel parts 501 can be avoided.

[0037] In some embodiments, the first positioning portion 502 is a convex strip extending along the length direction of the magnetic steel slot 500, and the second positioning portion 503 is a groove extending along the length direction of the magnetic steel part 501. The grooves on the magnetic steel part 501 of different magnetic poles are located on different surfaces of the magnetic steel part 501, that is, on opposite surfaces. The cross-sections of the convex strip and the groove are preferably triangular, with good fit, tight fit, and not easy to shift.

[0038] In some embodiments, a balancing weight column 900 is axially installed on the end face of each balancing ring 9. The balancing weight column 900 can be provided with a thread and can be used to fix the dynamic balancing weight block, and the installation and removal are convenient and quick.

[0039] In some embodiments, multiple fan blades 901 are axially installed on the end faces of the two balance rings 9. The fan blades 901 can accelerate the flow of heat in the casing 1 and accelerate the dissipation of internal heat through the casing 1, the front cover 2 and the rear cover 3. Heat dissipation holes 951 that are interconnected are axially opened on the rotor 5 and the balance rings 9 for heat flow to improve heat dissipation performance.

[0040] In some embodiments, a positioning key 400 is provided on the outer wall of the rotating shaft 4, and a keyway 950 corresponding to the positioning key 400 is opened on the center hole of the balance ring 9 and the rotor 5. The rotor 5 includes multiple silicon steel sheets stacked together and having a keyway 950. All silicon steel sheets are stacked based on this keyway 950. The rotor 5 can be automatically stacked or manually stacked. The silicon steel sheets are fixed by locking members to ensure that the inner diameter and outer diameter of the silicon steel sheets are concentric. The multiple silicon steel sheets are fixed by locking members 504. The locking members 504 can be screws, rivets or other suitable components. The positioning key 400 cooperates with the keyway 950 to prevent slipping and improve the speed and accuracy of installation.

[0041] In some embodiments, a plurality of balancing ring blind holes 505 are provided on each balancing ring 9 near the end of the rotor 5. The plurality of balancing ring blind holes 505 are evenly distributed along the axial direction and correspond to the position of the locking member 504. The plurality of balancing ring blind holes 505 are used to avoid air, or the two ends of the locking member 504 are correspondingly inserted into the balancing ring blind holes 505 of the two balancing rings 9 for fixation, thereby improving the stability of the structure.

[0042] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification. Although the embodiments of the utility model have been shown and described, ordinary technicians in this field can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and purpose of the utility model. The scope of the utility model is defined by the claims and their equivalents.

Claims

1. A permanent magnet motor structure, comprising a housing, a front cover and a rear cover correspondingly mounted at both ends of the housing, a front bearing and a rear bearing correspondingly mounted in the front cover and the rear cover, a rotating shaft rotatably connected between the front bearing and the rear bearing, a rotor coaxially mounted on the rotating shaft, a first end of the rotating shaft axially extending to the outside of the front cover, wherein: The rear bearing and the second end of the rotating shaft are sealed in the rear cover and are not connected to the outside of the rear cover. A plurality of magnetic steel grooves regularly distributed along the axial direction are opened in the rotor, and a magnetic steel part is inserted in each magnetic steel groove. Balance rings are installed at both ends of the rotor to fix the two ends of the magnetic steel part. An oil seal is installed in the front cover, and the oil seal is sleeved on the rotating shaft at the front end of the front bearing. A bearing pressure cover is sleeved on the rotating shaft at the rear end of the front bearing. At least two through holes are correspondingly opened on the end faces of the front cover and the bearing pressure cover, and a fastener is inserted in each through hole. The fasteners fasten the front cover and the bearing pressure cover together, and the bearing pressure cover and the outer ring of the front bearing are tightly fitted surface to surface.

2. The permanent magnet motor structure according to claim 1, characterized in that: The casing is an aluminum casing, and the front cover and the rear cover are cast iron covers. External stoppers are arranged at both ends of the casing, and internal stoppers are arranged on the front cover and the rear cover respectively. The external stoppers at both ends of the casing are correspondingly inserted into the internal stoppers of the front cover and the rear cover for fixing.

3. The permanent magnet motor structure according to claim 1 or 2, characterized in that: A first positioning portion is provided in each magnetic steel slot. In two adjacent magnetic steel slots, one of the first positioning portions is located on the magnetic steel slot surface close to the outer diameter of the rotor, and the other first positioning portion is located on the magnetic steel slot surface away from the outer diameter of the rotor; a second positioning portion corresponding to the first positioning portion is provided on the magnetic steel parts of different magnetic poles.

4. The permanent magnet motor structure according to claim 3, characterized in that: The first positioning portion is a convex strip extending along the length direction of the magnetic steel slot, and the second positioning portion is a groove extending along the length direction of the magnetic steel piece. The grooves on the magnetic steel pieces of different magnetic poles are located on different surfaces of the magnetic steel piece.

5. The permanent magnet motor structure according to claim 1 or 2, characterized in that: A balancing weight column is axially mounted on the end surface of each balancing ring.

6. The permanent magnet motor structure according to claim 5, characterized in that: A fan blade is axially mounted on the end surface of at least one balancing ring, and heat dissipation holes that penetrate each other are axially opened on the rotor and the balancing ring.

7. The permanent magnet motor structure according to claim 6, characterized in that: A positioning key is arranged on the outer wall of the rotating shaft, and a key slot corresponding to the positioning key is opened on the center hole of the balance ring and the rotor. The rotor comprises a plurality of silicon steel sheets stacked together, and the plurality of silicon steel sheets are fixed by locking members.

8. The permanent magnet motor structure as claimed in claim 7, characterized in that: A plurality of balancing ring blind holes are formed on each balancing ring close to the rotor end. The plurality of balancing ring blind holes are evenly distributed along the axial direction and correspond to the positions of the locking members.

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