Permanent magnet synchronous motor outer rotor structure of electric roller and electric roller

Abstract

The utility model relates to a kind of permanent magnet synchronous motor outer rotor structure of electric roller and electric roller, including the cylinder of the electric roller, recess and projection structure is uniformly distributed along its circumferential direction and is processed on the cylinder, it includes the inner convex part of the inward protruding inner wall in the cylinder, recess part is formed between adjacent two the inner convex part;The recess part is equipped with magnetic steel, and the polarity of each recess part magnetic steel is same;The cylinder uses high magnetic permeability material.The utility model improves cylinder structure, and its inner convex part is used as part of rotor magnetic pole, under the premise of reducing the dosage of magnetic steel, the purpose of motor multipole is realized.Meanwhile, rotor structure strength is improved, and production cost is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electric roller technology, and in particular to an external rotor structure of a permanent magnet synchronous motor for an electric roller and an electric roller. Background Technology

[0002] Currently, direct-drive roller conveyors are commonly used in the logistics sorting industry as the driving device for conveyor equipment. In some high-throughput scenarios, sorting efficiency of more than 20,000 pieces per hour is required, along with a low damage rate. These electric roller conveyors need to have fast response speeds, high sorting efficiency, and accurate consistency within the throwing range when handling goods of different weights. Therefore, these electric roller conveyors often use permanent magnet synchronous motors.

[0003] When a large number of permanent magnet poles are required, it is very difficult to distribute them on a motor rotor with a small diameter. On the other hand, the high cost of permanent magnets increases the cost of roller equipment. Therefore, the rotor poles of existing permanent magnet synchronous motors for rollers are limited by many factors such as rotor diameter, required speed, and cost, and cannot meet the application requirements of specific scenarios. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides a permanent magnet synchronous motor external rotor structure and an electric drum, achieving the purpose of multi-pole motor while reducing the amount of magnets used.

[0005] The technical solution adopted in this utility model is as follows:

[0006] This utility model provides a permanent magnet synchronous motor external rotor structure for an electric drum, including the cylinder of the electric drum, on which a concave-convex structure is machined evenly distributed along its circumference, including an inwardly protruding part located on the inner wall of the cylinder and a groove formed between two adjacent inwardly protruding parts.

[0007] The grooves are equipped with magnets, and the magnets in each groove have the same polarity.

[0008] The cylinder is made of a high magnetic permeability material.

[0009] The further technical solution is as follows:

[0010] The surface of the inner convex part is either curved or flat.

[0011] The width of the arc or plane is the same as the width of the magnet.

[0012] The number of grooves is the same as the number of pole pairs of the motor.

[0013] The magnets in each groove are either N-pole or S-pole.

[0014] The outer circumference of the cylinder has microstructures on the surface that comes into contact with the belt.

[0015] The outer circumference of the cylinder is provided with an anti-slip coating on the surface that comes into contact with the belt.

[0016] The cylinder is made of steel.

[0017] The concave-convex structure is integrally formed by an extrusion process.

[0018] This utility model also provides an electric drum, including the permanent magnet synchronous motor outer rotor structure of the electric drum.

[0019] The beneficial effects of this utility model are as follows:

[0020] This invention directly utilizes the internal convex portion formed by the driven cylinder itself as one part of the magnetic poles. Only half the number of magnets are needed for the other part, reducing the number of magnet components. This not only improves the utilization rate of the magnets but also enhances the structural strength of the rotor, reduces the difficulty of magnet installation, and lowers costs. It also facilitates multi-stage motors and reduces motor size.

[0021] Other features and advantages of this invention will be set forth in the following description or may be learned by practicing this invention. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the fit between the external rotor and the stator in Embodiment 1 of this utility model.

[0023] Figure 2 for Figure 1 A schematic diagram of the magnetic circuit of the inner and outer rotor structure.

[0024] In the diagram: 1. Cylinder; 2. Magnet; 3. Stator core; 101. Inner convex part; 102. Groove part. Detailed Implementation

[0025] The specific embodiments of this utility model are described below with reference to the accompanying drawings. Example 1

[0026] like Figure 1 As shown, the permanent magnet synchronous motor outer rotor structure of an electric drum in this embodiment includes a drum body 1. The drum body 1 is machined with a concave-convex structure evenly distributed along its circumference, which includes an inwardly protruding inner protrusion 101 located on the inner wall of the drum body 1 and a groove 102 formed between two adjacent inner protrusions 101.

[0027] A magnet 2 is provided in each groove 102, and the magnets 2 in each groove 102 have the same polarity;

[0028] The cylinder 1 is made of a high magnetic permeability material.

[0029] The inventive concept and principle of this embodiment are as follows:

[0030] By improving upon the traditional cylindrical structure, an inner convex portion is machined into the cylinder to form the corresponding magnetic pole dimensions. This creates a recessed area that only requires a magnet of one pole (N or S). See also Figure 2 Taking an S-pole magnet as an example, magnetic field lines originate from the S-pole surface of magnet 2, pass through the motor air gap and stator core 3, and form an N-pole magnetic field on the surface of the inner protrusion 101 of the cylinder 1, eventually returning to the N-pole surface of the magnet, thus completing a closed-loop magnetic circuit. This creates a uniformly distributed magnetic field with alternating N and S poles on the surface of the motor air gap. Similarly, if an N-pole magnet is installed, an S-pole magnetic field is formed between two adjacent N-pole magnets on the inner protrusion 101 where no magnet is installed. When the windings on the stator core 3 are energized, generating a magnetic field corresponding to the rotor poles, the rotor, including the cylinder, rotates under the action of magnetic attraction, thereby outputting power.

[0031] Specifically, the high permeability material used for the cylinder refers to a ferromagnetic material with a permeability greater than 100, which has the characteristics of high permeability, low coercivity, and low loss. In this embodiment, steel is preferred, which not only meets the high permeability requirement and helps reduce magnetic resistance, but also takes into account the convenience of production and processing.

[0032] Specifically, the cylinder is formed by extrusion processing, thereby integrally forming the inner convex part and the groove part.

[0033] Specifically, the number of grooves 102 is the same as the number of pole pairs of the motor.

[0034] Specifically, the surface of the inner convex part 101 is either curved or flat.

[0035] Preferably, the width of the arc surface or plane is the same as the width of the magnet 2.

[0036] As a further improvement, the outer circumferential wall of the cylinder has a microstructure on the surface that contacts the belt (i.e., the outer circumferential wall surface corresponding to the position of the groove 102).

[0037] When an electric roller is used in a belt conveyor, the roller body and the conveyor belt are assembled to drive the belt. Due to the internal protrusion, the contact area between the outer circumference of the roller body and the belt is reduced. The function of this microstructure is to improve the stability of the assembly between the roller body and the belt, maintaining the belt tension during equipment operation. This microstructure can be a sawtooth or wave-shaped microstructure.

[0038] As a further improvement, an anti-slip coating is provided on the outer circumference of the cylinder 1 corresponding to the groove 102. The anti-slip coating 4 is applied by brushing with an anti-slip material, and its function is the same as that of the microstructure, which is to improve the stability of the cylinder and belt assembly structure and prevent slippage. Example 2

[0039] This embodiment provides an electric drum including the permanent magnet synchronous motor external rotor structure described in Embodiment 1.

[0040] The electric roller in this embodiment can be used alone or in conjunction with other drive mechanisms, and is suitable for continuous or intermittent material conveying scenarios, including logistics sorting, loading and unloading platforms, etc.

[0041] It will be understood by those skilled in the art that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A permanent magnet synchronous motor outer rotor structure for an electric drum, characterized in that, The cylinder (1) includes the electric roller. The cylinder (1) is machined with a concave-convex structure evenly distributed along its circumference, which includes an inner protrusion (101) protruding inward from the inner wall of the cylinder (1) and a groove (102) formed between two adjacent inner protrusions (101). The groove (102) is provided with a magnet (2), and the magnet (2) in each groove (102) has the same polarity; The cylinder (1) is made of a high magnetic permeability material.

2. The permanent magnet synchronous motor outer rotor structure of the electric drum according to claim 1, characterized in that, The surface of the inner convex part (101) is either curved or flat.

3. The permanent magnet synchronous motor outer rotor structure of the electric drum according to claim 2, characterized in that, The width of the arc or plane is consistent with the width of the magnet (2).

4. The permanent magnet synchronous motor outer rotor structure of the electric drum according to claim 1, characterized in that, The number of the grooves (102) is the same as the number of pole pairs of the motor.

5. The permanent magnet synchronous motor outer rotor structure of the electric drum according to claim 1, characterized in that, The polarity of the magnets (2) in each groove (102) is either N or S.

6. The permanent magnet synchronous motor outer rotor structure of the electric drum according to claim 1, characterized in that, The outer circumferential wall of the cylinder (1) has microstructures on the surface that comes into contact with the belt.

7. The permanent magnet synchronous motor outer rotor structure of the electric drum according to claim 1, characterized in that, The outer circumferential wall of the cylinder (1) is provided with an anti-slip coating on the surface that comes into contact with the belt.

8. The permanent magnet synchronous motor outer rotor structure of the electric drum according to claim 1, characterized in that, The cylinder (1) is made of steel.

9. The permanent magnet synchronous motor outer rotor structure of the electric drum according to claim 1, characterized in that, The concave-convex structure is integrally formed by an extrusion process.

10. An electric roller, characterized in that, The permanent magnet synchronous motor external rotor structure includes the electric drum as described in any one of claims 1 to 9.

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