High-power motor

Abstract

The utility model discloses an optimized structure of a high-power motor. The optimized structure is composed of a motor main body, a central output shaft and a rotor assembly. The output shaft is made of high-strength steel and connected with a rotor formed by laminating silicon steel sheets. The rotor is of a multi-layer coaxial bearing supporting structure, the inner diameter and the outer diameter of a bearing are designed in a differentiated mode, high-hardness bearing steel materials are selected, radial friction loss is reduced through optimized diameter difference layout, and the torque of an output shaft is remarkably improved. The outer layer of the rotor is circumferentially and fixedly provided with a rectangular-section copper electric coil, the outer side of the rotor is embedded with an annular permanent magnet, the magnetic field coupling efficiency is enhanced through layered electromagnetic assembly layout, and high power density is realized. According to the design, hierarchical bearing supporting is integrated, and comprehensive improvement is formed in the aspects of mechanical transmission efficiency, magnetic field energy utilization and power transmission reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of motor technical field, especially a high-power motor. BACKGROUND

[0002] The power of conventional motor is usually increased by increasing current or optimizing electromagnetic material, but such methods are limited by material performance, heat dissipation capacity and other factors. The rotor structure of existing motor is mostly single bearing design, which results in low torque transmission efficiency, insufficient magnetic field coupling, and large rotor inertia, making it difficult to achieve high power density output. SUMMARY

[0003] In view of the above situation, it is necessary to provide a high-power motor to solve at least one of the above problems, comprising a motor body (1), an output shaft (2) arranged at the middle of the motor body (1), and a rotor (3) connected with the output shaft (2):

[0004] The rotor (3) is provided with at least two coaxial bearings (4) along the axial direction with the output shaft (2) as the center, and the difference between the inner diameter and the outer diameter of each bearing (4) is 10-12 cm;

[0005] The outermost layer of the rotor (3) is fixedly provided with an electric coil (5), and the outer side of the electric coil (5) is provided with a permanent magnet (6);

[0006] The side edge of the rotor (3) is surrounded by a toothed structure (7).

[0007] Preferably, the rotor (3) is a hollow structure.

[0008] Preferably, it further comprises a motor face cover (7), which covers the end of the motor body (1) and surrounds the bearing (4) and permanent magnet (6).

[0009] Preferably, the number of coaxial bearings (4) is 3, and the spacing between adjacent bearings (4) is equal.

[0010] Preferably, the tooth height of the toothed structure (7) is 10%-15% of the radius of the rotor (3).

[0011] Preferably, the distance between the permanent magnet (6) and the electric coil (5) is 5-8 mm.

[0012] Preferably, the electric coil (5) is spirally wound on the outermost layer of the rotor (3).

[0013] Preferably, the inner wall of the motor face cover (7) is provided with heat dissipation fins.

[0014] Preferably, the output shaft (2) and the bearing (4) are connected by means of splines. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a structural schematic view of a first perspective of a motor body of an embodiment of the present application.

[0016] Figure 2 is a structural schematic view of a second perspective of a motor body of an embodiment of the present application.

[0017] Figure 3 is Figure 2 is an enlarged view of B of

[0018] Figure 4 is a structural schematic view of a high-power motor of an embodiment of the present application.

[0019] Figure 5 is a structural schematic view of the interior of a high-power motor of an embodiment of the present application DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application high-power motor will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0021] In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more; the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0022] In the description of the present application, it should be noted that, unless otherwise specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] Referring to Figures 1 to 5 A high-power motor includes a motor body (1), an output shaft (2) arranged in the middle of the motor body (1), and a rotor (3) connected with the output shaft (2). The motor body (1) is provided with coaxial bearings (4) arranged around the output shaft (2) along the shaft, and the difference between the inner diameter and the outer diameter of each bearing (4) is 10-12 cm; the rotor (3) is installed on the bearing (4), and the outermost layer of the rotor (3) is circumferentially fixed with an electric coil (5), and the outer side of the electric coil (5) is provided with a permanent magnet (6).

[0024] In this embodiment, the output shaft (2) is made of high-strength steel to ensure the torque bearing capacity, and the coaxial bearings (4) are designed with different inner and outer diameters to form an optimized radial difference layout. The radial load is effectively decomposed through three levels of gradient distribution of bearing levels, which can reduce the friction loss caused by overload of a single bearing. After arranging the electric coil (5) with a rectangular cross section in the outermost layer of the rotor (3), the annular permanent magnet (6) is embedded on the outer side, and the efficient coupling of the magnetic induction lines is realized through the layered electromagnetic field topology structure. For example, when the rotor rotates, the alternating magnetic field generated by the energized electric coil (5) interacts with the fixed magnetic field of the permanent magnet (6) to form an axial thrust force, which is superimposed on the suppression ability of the bearing level to radial vibration, thereby improving the stability of torque output.

[0025] Referring to Figures 1 to 5 In another embodiment, the rotor (3) is a hollow structure.

[0026] The rotor (3) of this embodiment adopts a hollow design, which reduces the overall inertia by internal opening based on the silicon steel sheet lamination forming. The hollow structure reduces the driving torque required during acceleration of the rotor, and the magnetic conductivity is maintained through the asymmetric lamination process, thereby realizing fast response under high-speed working conditions. For example, the hollow part can be designed as a honeycomb structure for weight reduction, which ensures mechanical strength and avoids magnetic field distortion.

[0027] Referring to Figures 1 to 5 In another embodiment, a motor face cover (7) is further included, which covers the end of the motor body (1) and surrounds the bearings (4) and the permanent magnet (6).

[0028] The motor face cover (7) of this embodiment is fixed to the end of the motor body (1) by bolts to form a closed cavity to protect the internal electromagnetic components and bearings (4). For example, a sealing rubber ring is arranged at the joint surface of the face cover (7) and the body (1) to prevent dust from entering the bearing gap, and the internal space of the face cover is used to shield the magnetic field of the permanent magnet (6) to reduce external interference.

[0029] Referring toFigures 1 to 5 In another embodiment, the inner wall of the motor face cover (7) is provided with heat dissipation fins.

[0030] In this embodiment, the inner wall of the face cover (7) is provided with radiating heat dissipation fins to accelerate the heat dissipation from the bearing (4) and the coil (5) area through air convection. For example, when the motor is running, the fins of the face cover (7) can conduct the Joule heat of the coil (5) to the outside, forming a forced air cooling circulation system in combination with the spiral heat dissipation grooves on the surface of the rotor (3) (see Background Art).

[0031] See Figures 1 to 5 In another embodiment, the number of coaxial bearings (4) is 3, and the spacing between adjacent bearings (4) is equal.

[0032] In this embodiment, three coaxial bearings (4) are used with equal spacing, and the support points of adjacent bearings are uniformly distributed along the output shaft (2), forming a progressive load transfer path. For example, the first stage bearing is close to the output end to bear the main torque, and the second and third stage bearings extend to the middle of the motor in turn, compensating for the thermal expansion deformation of the shafting through differential inner and outer diameter design, reducing the radial runout of the rotor (3) during operation.

[0033] See Figures 1 to 5 In another embodiment, the distance between the permanent magnet (6) and the coil (5) is 5-8 mm.

[0034] In this embodiment, the air gap distance between the permanent magnet (6) and the coil (5) is precisely controlled to balance the magnetic field strength and magnetic leakage loss. For example, when the coil (5) is energized, the magnetic field coupling efficiency reaches a peak value when the distance is 6 mm, at which time the magnetic flux line penetrates the effective area of the copper coil is the largest, reducing the eddy current loss.

[0035] See Figures 1 to 5 In another embodiment, the coil (5) is spirally wound on the outermost layer of the rotor (3).

[0036] In this embodiment, the coil (5) uses a spiral winding process, which is uniformly distributed in the circumferential direction while forming an axial magnetic field component. For example, the spiral winding can produce an alternating cutting effect with the annular magnetic field of the permanent magnet (6) when the rotor rotates, which can improve the space utilization of magnetic flux and reduce electromagnetic interference at the end of the winding compared with traditional flat winding coils.

[0037] The above merely describes preferred embodiments of the present application and is not intended to limit the present application in any form. Although the present application has been disclosed with preferred embodiments, it is not intended to limit the present application. Any skilled person in the art can make minor changes or modifications to the disclosed technical content without departing from the technical solution of the present application, and any simple modification, equivalent change and modification of the above embodiments based on the technical essence of the present application still belong to the scope of the technical solution of the present application.

Claims

1. A high-power motor, comprising a motor body (1), an output shaft (2) disposed in the middle of the motor body (1), and a rotor (3) connected to the output shaft (2), characterized in that: The motor body (1) is provided with coaxial bearings (4) arranged around the output shaft (2) along the shaft, and the difference between the inner diameter and the outer diameter of each bearing (4) is 10cm to 12cm. The rotor (3) is mounted on the bearing (4), and the outermost circumferential layer of the rotor (3) is fixedly provided with an electric coil (5), and a permanent magnet (6) is provided on the outside of the electric coil (5).

2. The high-power motor as described in claim 1, characterized in that: The rotor (3) is a hollow structure.

3. The high-power motor as described in claim 1, characterized in that: It also includes a motor cover (7), which covers the end of the motor body (1) and surrounds the bearing (4) and the permanent magnet (6).

4. The high-power motor as described in claim 1, characterized in that: The number of coaxial bearings (4) is 3, and the spacing between adjacent bearings (4) is equal.

5. The high-power motor as described in claim 1, characterized in that: The distance between the permanent magnet (6) and the electric coil (5) is 5mm-8mm.

6. The high-power motor as described in claim 1, characterized in that: The coil (5) is spirally wound around the outermost layer of the rotor (3).

7. The high-power motor as described in claim 3, characterized in that: The inner wall of the motor cover (7) is provided with heat dissipation fins.

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