Permanent magnet motor casing

Abstract

The utility model provides a permanent magnet motor casing, and belongs to the technical field of motors. The problem that an existing motor is poor in stability is solved. The permanent magnet motor casing comprises two cylinders which are coaxially arranged, and the two cylinders are distributed at intervals along the axial direction of the cylinders; annular steps used for installing bearings are arranged on the inner side walls of the ends, away from each other, of the two barrel bodies, and the same circle of magnetic steel is embedded in the adjacent ends of the two barrel bodies. Annular limiting seats are formed on the outer side walls of the two barrels, the two limiting seats are distributed in the axial direction of the barrels in a spaced mode and fixedly connected through a circle of bolts, and the axes of the bolts and the axes of the barrels are parallel. An annular gap coaxial with the cylinder bodies exists between the adjacent end faces of the two cylinder bodies, and the annular gap is right opposite to the magnetic steel. The permanent magnet motor casing works stably.

Description

Technical Field

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

[0002] Permanent magnet motor is a type of motor that uses permanent magnets to generate the motor magnetic field. Its working principle is based on Faraday's law of electromagnetic induction and the Lorentz force principle. It has the advantages of simple structure and high reliability.

[0003] Existing permanent magnet motors, such as a new type of outer rotor motor disclosed in the China Patent Library (application number: 202220798339.0), include a front cover and a rear cover, the front cover and the rear cover are respectively integrally formed with a stepped annular wall structure, an installation cavity is formed in the annular wall structure, and through holes are provided at both axial ends of the front cover and the rear cover for installation; a central shaft, the left and right ends of the central shaft are installed through the through holes of the front cover and the rear cover respectively through the bearing units, and the installation cavities are arranged oppositely; a rubber pad, the rubber pad is arranged between the flange areas of the front cover and the rear cover; a stator, the stator is sleeved on the central shaft and arranged in the rear cover, and a rotor is installed between the outer circumference of the stator and the rear cover.

[0004] In the above-mentioned outer rotor motor, the magnet is attached to the inner wall of the mounting cavity and relies on the front cover and the rear cover for indirect heat dissipation, which hinders the heat dissipation of the magnet, especially in motors with densely arranged magnets, affecting the motor performance and working stability. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a permanent magnet motor casing which can improve the working stability of the motor.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a permanent magnet motor casing, characterized in that it includes two coaxially arranged cylinders, and the two cylinders are spaced apart along the axial direction of the cylinders; an annular step for installing bearings is provided on the inner side walls of the ends of the two cylinders that are far away from each other, and the same circle of magnetic steel is embedded in the adjacent ends of the two cylinders; annular limit seats are formed on the outer side walls of the two cylinders, and the two limit seats are spaced apart along the axial direction of the cylinders, and the two limit seats are fixedly connected by a circle of bolts, and the axes of the bolts and the cylinders are arranged in parallel; there is an annular gap coaxial with the cylinder between the adjacent end faces of the two cylinders, and the annular gap is arranged opposite to the magnetic steel.

[0007] The two limit seats are spaced apart along the axial direction of the cylinder, and there is an annular gap between the two cylinders that is arranged opposite to the magnetic steel, so that the magnetic steel can be directly contacted with the outside of the casing by utilizing the annular gap, effectively accelerating the heat dissipation of the magnetic steel, thereby enhancing the working stability and performance of the motor.

[0008] In the above-mentioned permanent magnet motor casing, an annular limiting surface is formed on the inner wall of the cylinder, the limiting surface and the cylinder are coaxial, and the magnetic steel is clamped between the two limiting surfaces to effectively limit the magnetic steel in the axial direction to prevent the magnetic steel from falling off, so that the motor can run more stably.

[0009] In the above permanent magnet motor housing, the limiting surface is conical, and the two limiting surfaces are symmetrically arranged along the center of the magnetic steel. The above design is adopted to facilitate the processing of the cylinder.

[0010] In the above-mentioned permanent magnet motor housing, the annular gap is composed of an outer groove and an inner groove that are connected and both annular, and the inner groove is between the outer groove and the magnetic steel; the axial cross-section of the outer groove is in the shape of a letter "I", the axial cross-section of the inner groove is in the shape of a letter "V", and the groove width of the inner groove gradually increases from the outer groove to the magnetic steel. The annular gap is composed of an outer groove and an inner groove with axial cross-sections of the letter "I" and the letter "V" respectively, which can expand the volume of the annular gap and further enhance the heat dissipation of the magnetic steel.

[0011] In the above permanent magnet motor housing, both limit seats are axially penetrated by a circle of through holes and a circle of threaded holes; on the same limit seat, the number of through holes and threaded holes is the same and they are alternately distributed along the circumference of the cylinder; each through hole is provided with the above bolt, the bolt rod is screwed into the corresponding threaded hole, and the bolt head is tightly pressed on the corresponding limit seat. The above design can reduce the cylinder processing procedures and reduce the processing difficulty.

[0012] As another solution, in the above permanent magnet motor housing, a circle of threaded holes 2 are axially penetrated on both limit seats, and the above bolts are screwed into the two threaded holes 2 facing each other. The above design can also stably connect the two cylinders.

[0013] In the above-mentioned permanent magnet motor casing, the outer contour of the limit seat is plum blossom-shaped, so that in actual use, the rotating component can be driven directly through the limit seat to operate, which is easy to install.

[0014] Compared with the prior art, the permanent magnet motor housing has the following advantages:

[0015] 1. The two limit seats are spaced apart along the axial direction of the cylinder, and there is an annular gap between the two cylinders that is directly opposite to the magnetic steel. The annular gap is used to make the magnetic steel directly contact with the outside of the casing, effectively accelerating the heat dissipation of the magnetic steel, thereby enhancing the working stability and performance of the motor.

[0016] 2. The annular gap is composed of an outer groove and an inner groove with an axial cross section of "I" and "V" shapes respectively, which can expand the volume of the annular gap and further enhance the heat dissipation of the magnetic steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional schematic diagram of the permanent magnet motor casing.

[0018] Figure 2 It is a schematic cross-sectional view of the permanent magnet motor casing.

[0019] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0020] In the figure, 1, cylinder; 1a, annular step; 1b, limit seat; 1c, limit surface; 1d, through hole; 1e, threaded hole 1; 2, magnetic steel; 3, bolt; 4, annular gap; 4a, outer groove; 4b, inner groove. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments. Embodiment 1

[0022] like Figure 1 As shown, the permanent magnet motor housing includes two coaxially arranged cylinders 1, and the two cylinders 1 are spaced apart along the axial direction of the cylinder 1.

[0023] in,

[0024] The inner side walls of the ends of the two cylinders 1 that are far from each other are provided with an annular step 1a for mounting the bearing, and the annular step 1a is coaxially arranged with the cylinder 1. The adjacent ends of the two cylinders 1 are embedded with the same circle of magnetic steel 2, that is, at this time, the two ends of the magnetic steel 2 are respectively fixed to the two cylinders 1.

[0025] like Figure 2 and Figure 3 As shown, an annular stopper 1b is formed on the outer wall of the two cylinders 1, and the stopper 1b is coaxially arranged with the cylinder 1. The two stopper 1b are spaced apart along the axial direction of the cylinder 1, that is, at this time, there is a gap between the two stopper 1b. The two stopper 1b are fixedly connected by a circle of bolts 3, and the axes of the bolts 3 and the cylinder 1 are arranged parallel. There is an annular gap 4 coaxial with the cylinder 1 between the adjacent end faces of the two cylinders 1, and the annular gap 4 is arranged opposite to the magnetic steel 2.

[0026] The two limit seats 1b are spaced apart along the axial direction of the cylinder 1, and there is an annular gap 4 between the two cylinders 1, which is arranged opposite to the magnet 2. The annular gap 4 is used to make the magnet 2 directly contact with the outside of the casing, effectively accelerating the heat dissipation of the magnet 2, thereby enhancing the working stability and performance of the motor.

[0027] Further explanation, such as Figure 3As shown, the annular gap 4 is composed of an outer groove 4a and an inner groove 4b which are connected and both annular, and the inner groove 4b is located between the outer groove 4a and the magnetic steel 2. The axial cross section of the outer groove 4a is in the shape of a letter "I", the axial cross section of the inner groove 4b is in the shape of a letter "V", and the groove width of the inner groove 4b gradually increases from the outer groove 4a to the magnetic steel 2. The annular gap 4 is composed of an outer groove 4a and an inner groove 4b whose axial cross sections are respectively in the shape of a letter "I" and a letter "V", which can expand the volume of the annular gap 4 and further enhance the heat dissipation of the magnetic steel 2.

[0028] In this embodiment,

[0029] like Figure 2 As shown, an annular limiting surface 1c is formed on the inner wall of the cylinder 1, the limiting surface 1c is coaxial with the cylinder 1, and the magnetic steel 2 is clamped between the two limiting surfaces 1c to effectively limit the magnetic steel 2 in the axial direction to prevent the magnetic steel 2 from falling off, so that the motor can run more stably. Preferably, the limiting surface 1c is conical, and the two limiting surfaces 1c are symmetrically arranged along the center of the magnetic steel 2. The above design is adopted to facilitate the processing of the cylinder 1.

[0030] like Figure 1 and Figure 2 As shown, the bolt 3 is installed as follows: a circle of through holes 1d and a circle of threaded holes 1e are axially penetrated on both limit seats 1b; on the same limit seat 1b, the number of through holes 1d and threaded holes 1e is the same and they are alternately distributed along the circumference of the cylinder 1; each through hole 1d is provided with the above-mentioned bolt 3, the rod of the bolt 3 is screwed into the corresponding threaded hole 1e, and the head of the bolt 3 is tightly pressed on the corresponding limit seat 1b. The above-mentioned design can reduce the processing steps of the cylinder 1 and reduce the processing difficulty.

[0031] In the actual product, the outer contour of the limit seat 1b is plum blossom-shaped, so that in actual use, the rotating component can be driven directly through the limit seat 1b to operate, which is easy to install. Embodiment 2

[0032] The structure and principle of the second embodiment are basically the same as those of the first embodiment, except that: a circle of threaded holes 2 are axially penetrated on both limit seats 1b, and the two threaded holes 2 facing each other are screwed with the above-mentioned bolts 3. The above-mentioned design can also stably connect the two cylinders 1.

[0033] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

Claims

1. A permanent magnet motor housing, characterized in that: The invention comprises two coaxially arranged cylinders (1), and the two cylinders (1) are spaced apart along the axial direction of the cylinders (1); an annular step (1a) for mounting a bearing is provided on the inner side walls of the ends of the two cylinders (1) which are separated from each other, and a same circle of magnetic steel (2) is embedded in the adjacent ends of the two cylinders (1); an annular limit seat (1b) is formed on the outer side walls of the two cylinders (1), and the two limit seats (1b) are spaced apart along the axial direction of the cylinders (1); the two limit seats (1b) are fixedly connected by a circle of bolts (3), and the axes of the bolts (3) and the cylinders (1) are arranged parallel to each other; an annular gap (4) coaxial with the cylinders (1) is provided between the adjacent end faces of the two cylinders (1), and the annular gap (4) is arranged directly opposite to the magnetic steel (2).

2. The permanent magnet motor housing according to claim 1, characterized in that: An annular limiting surface (1c) is formed on the inner wall of the cylinder (1); the limiting surface (1c) and the cylinder (1) are coaxial, and the magnetic steel (2) is clamped between the two limiting surfaces (1c).

3. The permanent magnet motor housing according to claim 2, characterized in that: The limiting surface (1c) is conical, and the two limiting surfaces (1c) are symmetrically arranged along the center of the magnetic steel (2).

4. The permanent magnet motor housing according to claim 1, 2 or 3, characterized in that: The annular gap (4) is composed of an outer groove (4a) and an inner groove (4b) which are connected and both have an annular shape, and the inner groove (4b) is located between the outer groove (4a) and the magnetic steel (2); the axial cross section of the outer groove (4a) is in an "I" shape, the axial cross section of the inner groove (4b) is in a "V" shape, and the groove width of the inner groove (4b) gradually increases from the outer groove (4a) toward the magnetic steel (2).

5. The permanent magnet motor housing according to claim 1, characterized in that: A circle of through holes (1d) and a circle of threaded holes (1e) are axially penetrated on both limit seats (1b); on the same limit seat (1b), the number of through holes (1d) and threaded holes (1e) is the same and they are alternately distributed along the circumference of the cylinder (1); each through hole (1d) is provided with the above-mentioned bolt (3), the rod of the bolt (3) is screwed into the corresponding threaded hole (1e), and the head of the bolt (3) is tightly pressed on the corresponding limit seat (1b).

6. The permanent magnet motor housing according to claim 1, characterized in that: The two limit seats (1b) are each axially penetrated by a circle of two threaded holes, and the above-mentioned bolts (3) are screwed into the two threaded holes that are located opposite to each other.

7. The permanent magnet motor housing according to claim 1, characterized in that: The outer contour of the limiting seat (1b) is in the shape of a plum blossom.

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