Permanent magnet motor

Abstract

The utility model provides a permanent magnet motor, and belongs to the technical field of motors. The problem that an existing motor is poor in operation stability is solved. The permanent magnet motor comprises a machine barrel, a circle of magnetic steel fixed to the inner side wall of the machine barrel and a stator assembly arranged in the machine barrel, a front plate and a rear plate are coaxially arranged in the two ends of the machine barrel respectively, a rotating shaft is integrally formed on the rear side face of the front plate, and the stator assembly is installed on the rotating shaft; the rotating shaft is pressed on the rear plate, and the rotating shaft and the rear plate are fixed together through a screw coaxial with the cylinder; a circle of first threaded holes axially penetrate through the rear plate, and a wire outlet hole for a cable of the stator assembly to extend out is formed in the front plate. Annular steps are arranged on the inner walls of the two ends of the machine barrel, bearings are arranged in the two annular steps, and the front plate and the rear plate are directly and rotationally supported on the machine barrel through the corresponding bearings. The outer wall of the machine barrel is provided with an annular driving part coaxial with the machine barrel, and the outer contour of the driving part is quincunx-shaped. The permanent magnet motor is stable in operation.

Description

Technical Field

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

[0002] Permanent magnet motor is a type of motor that uses permanent magnets to generate the motor magnetic field. It is divided into inner rotor permanent magnet motor and outer rotor permanent magnet motor.

[0003] Among them, the outer rotor permanent magnet motor, such as an outer rotor motor with a heat dissipation structure disclosed in the Chinese Patent Library (application number: 201820499236.8), includes a rotor, a stator, a front cover and a rear cover, the rotor is cylindrical, the stator is installed inside the rotor, and the front cover and the rear cover are respectively fixed to the front and rear ports of the rotor by hexagon socket screws; bearings are installed on the inner sides of the front cover and the rear cover, and the shaft ends at both ends of the stator pass through the bearings and the shaft holes in the middle of the front and rear covers respectively, the front cover is provided with positive cyclone blades, and exhaust holes are formed between adjacent positive cyclone blades; the rear cover is provided with reverse cyclone blades, and suction holes are formed between adjacent reverse cyclone blades.

[0004] In the above permanent magnet motor, the front and rear end covers are rotatably arranged on the intermediate shaft through bearings, and the rotor is fixed to the front and rear end covers through screws. Limited by the coaxial installation accuracy of the screws, after assembly, it is easy to cause different forces on the two ends of the rotor. In this case, when the driven component is installed on the rotor, it is easy to cause slight shaking during rotation, affecting the transmission accuracy and stability. Utility Model Content

[0005] The utility model aims to solve the above problems in the prior art and proposes a permanent magnet motor with stable operation.

[0006] The purpose of the utility model can be achieved through the following technical solutions: a permanent magnet motor, comprising a barrel, a circle of magnetic steel fixed on the inner wall of the barrel and a stator assembly arranged in the barrel, characterized in that a front plate and a rear plate are coaxially arranged in the two ends of the barrel, a rotating shaft is integrally formed on the rear side of the front plate, and the stator assembly is installed on the rotating shaft; the rotating shaft is pressed on the rear plate and the two are fixed together by screws coaxial with the barrel; a circle of threaded holes is axially penetrated through the rear plate, and a wire outlet hole for the cable of the stator assembly to extend out is provided on the front plate; annular steps are provided on the inner walls at both ends of the barrel, bearings are provided in the two annular steps, and the front plate and the rear plate are directly rotatably supported on the barrel by corresponding bearings; a driving part in the shape of an annulus and coaxial with the barrel is provided on the outer wall of the barrel, and the outer contour of the driving part is plum blossom-shaped.

[0007] During installation, the motor is installed and positioned using a threaded hole set on the rear plate; a groove for accommodating the motor is provided on the driven component, and the side wall of the groove is in a plum blossom shape matching the driving part, so that the motor can stably drive the driven component to rotate.

[0008] The barrel is directly connected to the front plate and the rear plate respectively by bearings arranged in the annular step, which not only effectively omits the intermediate transmission components, but also shortens the distance between the drive unit and the bearing, so that the drive unit can be supported more reliably and stably, thereby making the motor run more stably.

[0009] In the above-mentioned permanent magnet motor, the above-mentioned annular step is composed of an annular side wall and an annular bottom wall, and the bearing includes an inner ring and an outer ring, and the two inner rings form an interference fit with the front plate and the rear plate respectively, and the two outer rings form an interference fit with the two annular side walls respectively; the front plate outer wall and the rear plate outer wall are respectively formed with a front limit ring and a rear limit ring, and the opposite ends of the two inner rings are respectively pressed against the front limit ring and the rear limit ring, and the adjacent ends of the two outer rings are respectively pressed against the two annular bottom walls. With the cooperation of the front limit ring, the rear limit ring and the two annular bottom walls, the bearing is stabilized in the axial direction, further ensuring the stable operation of the motor.

[0010] In the above-mentioned permanent magnet motor, a circle of threaded holes 2 is axially penetrated on the front plate, so that the motor can be installed in both directions and adapted to different working conditions, and has good practicality.

[0011] In the above permanent magnet motor, the barrel includes two coaxially arranged base rings, the two base rings are distributed along the axial direction of the barrel, and the two base rings are fixed together; the two annular steps are respectively arranged on the two base rings, and the outer walls of the two base rings are provided with the above driving parts; the two ends of the magnetic steel are respectively fixedly connected to the two base rings. The above design can facilitate the overall assembly of the motor.

[0012] In the above-mentioned permanent magnet motor, annular limiting surfaces are formed on the inner walls of the two base rings. The limiting surfaces are coaxially arranged with the barrel, and the magnetic steel is clamped between the two limiting surfaces for axial limiting of the magnetic steel to prevent the magnetic steel from falling off, thereby further ensuring stable operation of the motor.

[0013] In the above permanent magnet motor, 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 base ring.

[0014] In the above-mentioned permanent magnet motor, the two base rings are fixed together by a circle of bolts, and the axes of the bolts and the base rings are arranged in parallel.

[0015] In the above-mentioned permanent magnet motor, the two driving parts are spaced apart along the axial direction of the base ring, and there is an annular gap between the two base rings that is arranged opposite to the magnetic steel. The annular gap is coaxial with the base ring, and the annular gap is arranged opposite to the magnetic steel. The annular gap and the axial spacing of the two driving parts are conducive to the heat dissipation of the magnetic steel, and further improve the working stability of the motor.

[0016] In the above-mentioned permanent magnet motor, the annular gap is composed of an outer gap and an inner slot body, both of which are annular, and the inner slot body is between the magnetic steel and the outer gap. The axial cross-sections of the outer gap and the inner slot body are respectively in the shape of a "I" and a "V", and the outer gap and the inner slot body are connected. With the cooperation of the outer gap and the inner slot body, the heat conduction area can be expanded, and the heat dissipation of the magnetic steel can be further accelerated.

[0017] In the above-mentioned permanent magnet motor, both driving parts are axially penetrated by a circle of through holes and a circle of threaded holes three; on the same driving part, the number of through holes and threaded holes three is the same and they are alternately distributed along the circumference of the barrel; each through hole is provided with the above-mentioned bolt, the bolt rod is screwed into the corresponding threaded hole three, and the bolt head is tightly pressed on the corresponding driving part. The above-mentioned design can reduce the difficulty of base ring processing.

[0018] Compared with the existing technology, this permanent magnet motor has the following advantages:

[0019] 1. The barrel is directly connected to the front plate and the rear plate by the bearings arranged in the annular step. This can not only effectively omit the intermediate transmission components, but also shorten the distance between the drive unit and the bearing, so that the drive unit can be supported more reliably and stably, thereby making the motor run more stably.

[0020] 2. Setting the annular gap and the two driving parts in an axially spaced distribution is beneficial to the heat dissipation of the magnetic steel and further improves the working stability of the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the permanent magnet motor.

[0022] Figure 2 It is a cross-sectional schematic diagram of the permanent magnet motor.

[0023] Figure 3 yes Figure 2 A magnified schematic diagram of center A.

[0024] In the figure, 1, barrel; 1a, annular step; 1b, driving part; 1c, base ring; 1d, limiting surface; 1e, annular gap; 1e1, outer gap; 1e2, inner slot; 2, magnetic steel; 3, stator assembly; 4, front plate; 4a, rotating shaft; 4b, wire outlet hole; 4c, threaded hole 2; 4d, front limiting ring; 5, rear plate; 5a, threaded hole 1; 5b, rear limiting ring; 6, screws; 7, bearings; 8, bolts. DETAILED DESCRIPTION

[0025] 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.

[0026] like Figure 1 and Figure 2 As shown, the permanent magnet motor includes a barrel 1, a circle of magnetic steel 2 fixed on the inner wall of the barrel 1, and a stator assembly 3 arranged in the barrel 1. Among them, the stator assembly 3 generally includes a stator core and a winding arranged on the stator core, and the winding includes a cable.

[0027] Specifically,

[0028] like Figure 1 and Figure 2 As shown, the two ends of the barrel 1 are coaxially provided with a front plate 4 and a rear plate 5, respectively. A rotating shaft 4a is integrally formed on the rear side of the front plate 4, and the rotating shaft 4a and the barrel 1 are coaxially arranged. The stator assembly 3 is mounted on the rotating shaft 4a, that is, at this time, the stator core is sleeved and fixed on the rotating shaft 4a, and the two are generally fixedly connected by interference fit. The rotating shaft 4a is pressed on the rear plate 5 and the two are fixed together by a screw 6 coaxial with the barrel 1. A circle of threaded holes 5a is axially penetrated on the rear plate 5, and a circle of threaded holes 5a is evenly distributed along the circumference of the barrel 1. The front plate 4 is provided with an outlet hole 4b for the cable of the stator assembly 3 to extend out. Annular steps 1a are provided on the inner walls of both ends of the barrel 1, and the annular steps 1a are coaxial with the barrel 1. Bearings 7 are provided in both annular steps 1a, and the front plate 4 and the rear plate 5 are directly supported on the barrel 1 by corresponding bearings 7. The outer wall of the barrel 1 is provided with a driving portion 1 b which is annular and coaxial with the barrel 1 , and the outer contour of the driving portion 1 b is plum blossom-shaped.

[0029] During installation, the motor is installed and positioned using a threaded hole 5a set on the rear plate 5; a groove for accommodating the motor is provided on the driven part 1b, and the side wall of the groove is in a plum blossom shape that matches the driving part 1b, so that the motor can stably drive the driven part 1b to rotate.

[0030] The barrel 1 is directly connected to the front plate 4 and the rear plate 5 respectively by means of the bearing 7 arranged in the annular step 1a, which not only effectively omits the intermediate transmission components, but also shortens the distance between the driving part 1b and the bearing 7, so that the driving part 1b can be supported more reliably and stably, thereby making the motor run more stably.

[0031] To further illustrate, a circle of threaded holes 4c is axially penetrated through the front plate 4, so that the motor can be installed in both directions, adapting to different working conditions and having good practicality.

[0032] In this embodiment,

[0033] The screw 6 is installed as follows: a positioning hole is axially penetrated on the rear plate 5, and the positioning hole and the rear plate 5 are coaxially arranged. A threaded hole 4 is correspondingly arranged on the rotating shaft 4a, and the rod of the screw 6 passes through the positioning hole and is screwed into the threaded hole 4, and the head of the screw 6 is tightly pressed on the rear plate 5.

[0034] The installation method of the bearing 7 is as follows: the annular step 1a is composed of an annular side wall and an annular bottom wall. The type of the bearing 7 is a ball bearing 7, which includes an inner ring and an outer ring. The two inner rings form an interference fit with the front plate 4 and the rear plate 5 respectively, and the two outer rings form an interference fit with the two annular side walls respectively. Further explanation: the front limit ring 4d and the rear limit ring 5b are integrally formed on the outer wall of the front plate 4 and the outer wall of the rear plate 5, respectively, and the front limit ring 4d, the rear limit ring 5b and the barrel 1 are coaxially arranged. Among them, the opposite ends of the two inner rings are pressed against the front limit ring 4d and the rear limit ring 5b respectively; the adjacent ends of the two outer rings are pressed against the two annular bottom walls respectively. With the cooperation of the front limit ring 4d, the rear limit ring 5b and the two annular bottom walls, the bearing 7 is stabilized in the axial direction, further ensuring the stable operation of the motor.

[0035] like Figure 1 As shown, the structure of the barrel 1 is as follows: the barrel 1 includes two coaxially arranged base rings 1c, the two base rings 1c are distributed along the axial direction of the barrel 1, and the two base rings 1c are fixed together. Two annular steps 1a are respectively arranged on the two base rings 1c, and the outer walls of the two base rings 1c are provided with a driving part 1b. The two ends of the magnetic steel 2 are respectively fixedly connected to the two base rings 1c. The above design can facilitate the overall assembly of the motor.

[0036] In the actual product, the magnet 2 is embedded in the base ring 1c. It is further explained that the inner walls of the two base rings 1c are formed with an annular limiting surface 1d, which is coaxially arranged with the barrel 1, and the magnet 2 is clamped between the two limiting surfaces 1d, which is used to limit the axial position of the magnet 2 to prevent the magnet 2 from falling off, and further ensure the stable operation of the motor. Preferably, the limiting surface 1d is conical, and the two limiting surfaces 1d are symmetrically arranged along the center of the magnet 2. The above design is adopted to facilitate the processing of the base ring 1c.

[0037] The two base rings 1c are installed as follows: the two base rings 1c are fixed together by a circle of bolts 8, and the axes of the bolts 8 and the base rings 1c are arranged in parallel. Specifically, a circle of through holes and a circle of threaded holes three are axially penetrated on both driving parts 1b; on the same driving part 1b, the number of through holes and threaded holes three is the same and they are alternately distributed along the circumference of the barrel 1; each through hole is provided with the above-mentioned bolt 8, the rod of the bolt 8 is screwed into the corresponding threaded hole three, and the head of the bolt 8 is tightly pressed on the corresponding driving part 1b. The above-mentioned design can reduce the difficulty of processing the base ring 1c.

[0038] like Figure 2 and Figure 3As shown, the two driving parts 1b are axially spaced and distributed along the base ring 1c so that there is a gap between the two driving parts 1b. There is an annular gap 1e between the two base rings 1c, which is set opposite to the magnetic steel 2. The annular gap 1e and the two driving parts 1b are arranged axially spaced, which is conducive to the heat dissipation of the magnetic steel 2 and further improves the working stability of the motor. It is further explained that the annular gap 1e is composed of an outer gap 1e1 and an inner groove body 1e2, both of which are annular, and the inner groove body 1e2 is between the magnetic steel 2 and the outer gap 1e1. The axial cross-sections of the outer gap 1e1 and the inner groove body 1e2 are respectively in the shape of "I" and "V", and the outer gap 1e1 and the inner groove body 1e2 are connected. With the cooperation of the outer gap 1e1 and the inner groove body 1e2, the heat conduction area can be expanded, and the heat dissipation of the magnetic steel 2 can be further accelerated.

[0039] 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, comprising a barrel (1), a ring of magnetic steel (2) fixed on the inner wall of the barrel (1), and a stator assembly (3) arranged in the barrel (1), characterized in that: A front plate (4) and a rear plate (5) are coaxially arranged at both ends of the barrel (1), a rotating shaft (4a) is integrally formed on the rear side surface of the front plate (4), and the stator assembly (3) is mounted on the rotating shaft (4a); the rotating shaft (4a) is pressed on the rear plate (5), and the two are fixed together by a screw (6) coaxial with the barrel (1); a circle of threaded holes (5a) are axially penetrated through the rear plate (5), and a wire outlet hole (4b) is provided on the front plate (4) for the cable of the stator assembly (3) to extend out; annular steps (1a) are provided on the inner walls of both ends of the barrel (1), bearings (7) are provided in the two annular steps (1a), and the front plate (4) and the rear plate (5) are directly rotatably supported on the barrel (1) by means of corresponding bearings (7); a driving part (1b) in the shape of an annulus and coaxial with the barrel (1) is provided on the outer wall of the barrel (1), and the outer contour of the driving part (1b) is plum blossom-shaped.

2. The permanent magnet motor according to claim 1, characterized in that: The annular step (1a) is composed of an annular side wall and an annular bottom wall. The bearing (7) comprises an inner ring and an outer ring. The two inner rings form an interference fit with the front plate (4) and the rear plate (5) respectively, and the two outer rings form an interference fit with the two annular side walls respectively. A front limit ring (4d) and a rear limit ring (5b) are respectively formed on the outer wall of the front plate (4) and the outer wall of the rear plate (5). The ends of the two inner rings facing each other are respectively pressed against the front limit ring (4d) and the rear limit ring (5b), and the adjacent ends of the two outer rings are respectively pressed against the two annular bottom walls.

3. The permanent magnet motor according to claim 1 or 2, characterized in that: A circle of threaded holes (4c) is axially penetrated through the front plate (4).

4. The permanent magnet motor according to claim 1, characterized in that: The barrel (1) comprises two coaxially arranged base rings (1c), the two base rings (1c) are distributed along the axial direction of the barrel (1), and the two base rings (1c) are fixed together; the two annular steps (1a) are respectively arranged on the two base rings (1c), and the outer walls of the two base rings (1c) are provided with the above-mentioned driving parts (1b); and the two ends of the magnetic steel (2) are respectively fixedly connected to the two base rings (1c).

5. The permanent magnet motor according to claim 4, characterized in that: An annular limiting surface (1d) is formed on the inner walls of the two base rings (1c); the limiting surface (1d) is coaxially arranged with the barrel (1), and the magnetic steel (2) is clamped between the two limiting surfaces (1d).

6. The permanent magnet motor according to claim 5, characterized in that: The limiting surface (1d) is conical, and the two limiting surfaces (1d) are symmetrically arranged along the center of the magnetic steel (2).

7. The permanent magnet motor according to claim 4, 5 or 6, characterized in that: The two base rings (1c) are fixed together by a circle of bolts (8), and the axes of the bolts (8) and the base ring (1c) are arranged in parallel.

8. The permanent magnet motor according to claim 7, characterized in that: The two driving parts (1b) are spaced apart along the axial direction of the base ring (1c); an annular gap (1e) arranged opposite to the magnetic steel (2) exists between the two base rings (1c); the annular gap (1e) is coaxial with the base ring (1c), and the annular gap (1e) is arranged opposite to the magnetic steel (2).

9. The permanent magnet motor according to claim 8, characterized in that: The annular gap (1e) is composed of an outer gap (1e1) and an inner groove body (1e2) both of which are annular, and the inner groove body (1e2) is between the magnetic steel (2) and the outer gap (1e1), and the axial cross-sections of the outer gap (1e1) and the inner groove body (1e2) are respectively in the shape of a letter "I" and a letter "V", and the outer gap (1e1) and the inner groove body (1e2) are connected.

10. The permanent magnet motor according to claim 7, characterized in that: A circle of through holes and a circle of threaded holes three are axially penetrated on both driving parts (1b); on the same driving part (1b), the number of through holes and threaded holes three is the same and they are alternately distributed along the circumference of the barrel (1); each through hole is provided with the above-mentioned bolt (8), the rod of the bolt (8) is screwed into the corresponding threaded hole three, and the head of the bolt (8) is tightly pressed on the corresponding driving part (1b).

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