Motor rotor

Abstract

The utility model discloses a motor rotor, which comprises a motor shaft, a rotor and magnetic steels, the rotor is fixedly arranged on the motor shaft, the magnetic steels are arranged on the rotor at equal interval angles, and the motor rotor is characterized by further comprising a limiting assembly and a bearing assembly. Magnetic steel grooves are formed in the rotor in the circumferential direction of the rotor at equal intervals and angles, the magnetic steel grooves penetrate vertically, and the magnetic steel is arranged in the magnetic steel grooves. The limiting assembly comprises an upper end cover and a lower end cover. The upper end cover is provided with a motor shaft hole, and the upper end cover is sleeved on the rotor and the upper end of the magnetic steel to limit the magnetic steel in the axial direction and the radial direction. The lower end cover is provided with a motor shaft hole, and the lower end cover is sleeved on the rotor and the lower end of the magnetic steel to limit the magnetic steel in the axial downward direction and the radial direction. The bearing assembly comprises an upper bearing and a lower bearing. The upper bearing is fixedly arranged at the upper end of the motor shaft through the inner ring of the upper bearing in an interference fit mode, and the upper end cover is limited and fixed in the axial direction. The lower bearing is fixedly arranged at the lower end of the motor shaft through the inner ring of the lower bearing in an interference fit mode, and the lower end cover is limited and fixed in the axial direction.

Description

TECHNICAL FIELD

[0001] The utility model relates to motor technical field, concretely is a motor rotor. BACKGROUND

[0002] Brushless motor is widely used in various electric tools, such as sander, waxing machine etc. Stator and rotor are two main parts of brushless motor. The magnetic steel sheet on the rotor in traditional technology is usually directly bonded on the outer cylindrical surface of rotor core, and the phenomenon of magnetic steel sheet falling off easily occurs in the high-speed rotation process of rotor, which affects the normal work of motor. In order to prevent falling off, the rotor core is usually coated with glue first, and then the magnetic steel sheet is embedded on the rotor. The magnetic steel sheet is fixed and embedded by glue at the same time, and the use reliability is greatly improved. Chinese patent document CN217643106U discloses a motor gluing equipment, which is used for gluing, and the magnetic steel sheet is fixed by glue on the rotor. Chinese patent document CN221669636U discloses a motor rotor magnetic steel anti-falling structure. The rotor punching sheet of the structure is provided with a plurality of magnetic steel fixing structures which are the same in structure along the outer periphery, are arranged at equal intervals between two magnetic steel fixing structures, and each magnetic steel fixing structure penetrates the rotor punching sheet in the axial direction. That is, the length of each magnetic steel fixing structure is consistent with the thickness of the rotor punching sheet. Each magnetic steel fixing structure includes a trapezoidal structure protrusion, the bottom shape of the trapezoidal structure protrusion is consistent with the outer periphery shape of the rotor punching sheet or the connected rotor punching sheet, and the trapezoidal structure protrusion is fixedly connected to the outer periphery of the rotor punching sheet. The so-called consistent means that the bottom shape of the trapezoidal structure protrusion is consistent with the outer periphery shape of the rotor punching sheet or the connected rotor punching sheet. An arc-shaped groove is formed in the trapezoidal structure protrusion. The magnetic steel and the trapezoidal groove are gap-fitted, and the two are connected by adhesive bonding. This structure is fixed by glue and embedded. Since heat is generated during the operation of the motor, the glue softens and loses the fixing effect, the magnetic steel sheet falls off along the axial direction, slides out of the trapezoidal groove, and collides with the stator, causing damage. Moreover, the embedded fixing has high production requirements, otherwise it will cause assembly difficulty or axial falling off. SUMMARY

[0003] The utility model aims at providing a motor rotor which has simple structure and can effectively fix the magnetic steel.

[0004] The basic technical solution for achieving the purpose of this utility model is as follows: A motor rotor includes a motor shaft, a rotor, and magnets. The rotor is fixedly mounted on the motor shaft, and the magnets are arranged on the rotor at equal intervals. Its structural features include a limiting assembly and a bearing assembly. The rotor has magnet slots at equal intervals along its circumference, extending vertically, with magnets disposed within the slots. The limiting assembly includes an upper end cover and a lower end cover. The upper end cover has a motor shaft hole and is fitted onto the upper ends of the rotor and magnets, limiting the magnets axially upwards and radially. The lower end cover has a motor shaft hole and is fitted onto the lower ends of the rotor and magnets, limiting the magnets axially downwards and radially. The bearing assembly includes an upper bearing and a lower bearing. The upper bearing is fixedly mounted on the upper end of the motor shaft by an interference fit of its inner ring, providing axial limiting fixation for the upper end cover. The lower bearing is fixedly mounted on the lower end of the motor shaft by an interference fit of its inner ring, providing axial limiting fixation for the lower end cover.

[0005] Furthermore, to improve the reliability of the fixation: the upper cover is a one-piece piece made of stainless steel. The lower cover is a one-piece piece made of stainless steel.

[0006] Furthermore, for noise reduction, the limiting assembly also includes an upper clamping cover and a lower clamping cover. The upper clamping cover has an upwardly protruding upper clamping portion on its upper side. The upper clamping cover presses and fixes itself to the upper end cover from top to bottom, providing axial limiting and fixing of the upper end cover 4-1. The lower clamping cover has a downwardly protruding lower clamping portion on its lower side. The lower clamping cover presses and fixes itself to the lower end cover from bottom to top, providing axial limiting and fixing of the lower end cover.

[0007] The upper bearing is pressed and fixed to the upper pressing part of the upper pressing cover from above by its inner ring, and the lower bearing is pressed and fixed to the lower pressing part of the lower pressing cover from below by its inner ring from above.

[0008] Furthermore, for ease of installation and positioning: the cross-section of the rotor's magnet slots is a dovetail shape, wider at the inside and narrower at the outside. The cross-sectional shape of the magnets corresponds to the magnet slots, thus allowing the magnets to be embedded and fixed within the slots.

[0009] Furthermore, to improve the fixation strength and reduce noise, the magnets are bonded and fixed in the magnet groove.

[0010] The present invention has the following beneficial effects: (1) The motor rotor structure of the present invention is simple. The magnet is axially and radially limited by the upper end cover and the lower end cover. It has good reliability and does not affect heat dissipation. The upper end cover and the lower end cover are provided with an upper clamping cover and a lower clamping cover between them and the corresponding upper bearing and lower bearing. The upper clamping cover is provided with an upper clamping part and the lower clamping cover is provided with a lower clamping part. Thus, the limiting component can be clamped and fixed on the rotor and the magnet by the inner ring of the upper bearing and the lower bearing. It has good reliability and is conducive to noise reduction, avoiding noise caused by the loosening of the end cover. (2) The magnet of the present invention is bonded and fixed in the magnet groove and / or embedded and fixed in the magnet groove. It is conducive to improving assembly efficiency and reducing the production requirements of the magnet. Compared with only embedding and fixing in the magnet groove, the glue can also play a buffer and shock absorption role by bonding and fixing. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the motor rotor of this utility model.

[0012] Figure 2 for Figure 1 A top-down view.

[0013] Figure 3 for Figure 1 A left-side view diagram.

[0014] Figure 4 for Figure 1 A diagram showing the view from below.

[0015] Figure 5 From Figure 1 A diagram showing the view from the upper left front.

[0016] Figure 6 This is a schematic diagram of an explosion of an electric motor rotor.

[0017] Figure 7 This is a schematic diagram of the rotor.

[0018] The labels in the attached diagram are:

[0019] Motor shaft 1,

[0020] Rotor 2, Magnet slot 2-1,

[0021] Magnet 3,

[0022] Limiting component 4, upper end cover 4-1, lower end cover 4-2, upper clamping cover 4-3, upper clamping part 4-31, lower clamping cover 4-4, lower clamping part 4-41.

[0023] Bearing assembly 5, upper bearing 5-1, lower bearing 5-2. Detailed Implementation

[0024] To make the content of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. The description of the orientation of this utility model is as follows: Figure 1 Proceeding in the indicated direction, that is Figure 1 The up, down, left, and right directions shown are the same as the directions described. Figure 1 The direction one faces is the front, and the direction one turns away from is the back. Figure 1 The side to the left is the rear. The terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model or simplifying the description, rather than indicating a specific orientation that must be present.

[0025] (Example 1)

[0026] See Figures 1 to 7 The motor rotor of this utility model includes a motor shaft 1, a rotor 2, a magnet 3, a limiting component 4, and a bearing component 5.

[0027] See Figures 1 to 7 The rotor 2 is fixedly mounted on the motor shaft 1. The rotor 2 has magnet slots 2-1 spaced at equal intervals along its circumference, extending from top to bottom, with a dovetail-shaped cross-section that is larger on the inside and smaller on the outside. The cross-sectional shape of the magnet 3 corresponds to that of the magnet slots 2-1, allowing the magnet 3 to be embedded and fixed within them. The magnet 3 is either bonded and fixed within the magnet slots 2-1 or embedded and fixed within them.

[0028] See Figure 6 The limiting component 4 includes an upper end cover 4-1, a lower end cover 4-2, an upper clamping cover 4-3, and a lower clamping cover 4-4. The upper end cover 4-1 is a single piece made of stainless steel. It has a motor shaft hole and is fitted onto the upper ends of the rotor 2 and the magnet 3, thereby limiting the magnet 3 axially and radially. The lower end cover 4-2 is also a single piece made of stainless steel. It has a motor shaft hole and is fitted onto the lower ends of the rotor 2 and the magnet 3, thereby limiting the magnet 3 axially and radially. The upper clamping cover 4-3 is a single piece made of nylon, and its upper side has an upwardly protruding upper clamping part 4-31. The upper clamping cover 4-3 has a through-hole for the motor shaft, and is pressed and fixed to the upper end cover 4-1 from top to bottom, thus limiting and fixing the upper end cover 4-1 axially. The lower clamping cover 4-4 is a one-piece piece made of nylon material, and has a downwardly protruding lower clamping part 4-41 on its lower side. The lower clamping cover 4-4 has a through-hole for the motor shaft, and is pressed and fixed to the lower end cover 4-2 from bottom to top, thus limiting and fixing the lower end cover 4-2 axially.

[0029] The bearing assembly 5 comprises an upper bearing 5-1 and a lower bearing 5-2. The upper bearing 5-1 is fixedly arranged on the upper end of the motor shaft 1 by interference fit of its inner ring, and is fixedly pressed on the upper pressing part 4-31 of the upper pressing cover 4-3 from above by its inner ring, thereby limiting and fixing the upper pressing cover 4-3 in the axial direction. The lower bearing 5-2 is fixedly arranged on the lower end of the motor shaft 1 by interference fit of its inner ring, and is fixedly pressed on the lower pressing part 4-41 of the lower pressing cover 4-4 from below by its inner ring, thereby limiting and fixing the lower pressing cover 4-4 in the axial direction.

[0030] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the present application, and it should be understood that the above description is only for specific embodiments of the present application and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A motor rotor, comprising a motor shaft (1), a rotor (2) and a magnetic steel (3), the rotor (2) is fixedly arranged on the motor shaft (1), and the magnetic steel (3) is arranged on the rotor (2) at equal intervals, characterized in that: Also include limiting assembly (4) and bearing assembly (5); rotor (2) is provided with magnetic steel groove (2-1) along its circumferential equal interval angle, magnetic steel groove (2-1) penetrates up and down, magnetic steel (3) is arranged in magnetic steel groove (2-1); limiting assembly (4) includes upper end cover (4-1) and lower end cover (4-2); upper end cover (4-1) is provided with motor shaft hole, upper end cover (4-1) is sleeved on the upper end of rotor (2) and magnetic steel (3), and the magnetic steel (3) is axially upward and radially limited; lower end cover (4-2) is provided with motor shaft hole, lower end cover (4-2) is sleeved on the lower end of rotor (2) and magnetic steel (3), and the magnetic steel (3) is axially downward and radially limited; bearing assembly (5) includes upper bearing (5-1) and lower bearing (5-2); upper bearing (5-1) is fixedly arranged on the upper end of motor shaft (1) by the interference fit of its inner ring, and the upper end cover (4-1) is axially limited and fixed; lower bearing (5-2) is fixedly arranged on the lower end of motor shaft (1) by the interference fit of its inner ring, and the lower end cover (4-2) is axially limited and fixed.

2. The electrical machine rotor of claim 1, wherein: The upper end cover (4-1) is made of stainless steel material as an integral part; the lower end cover (4-2) is made of stainless steel material as an integral part.

3. The motor rotor of claim 1, wherein: The limiting assembly (4) further includes upper pressing cover (4-3) and lower pressing cover (4-4); the upper side of the upper pressing cover (4-3) is provided with an upwardly protruding upper pressing portion (4-31); the upper pressing cover (4-3) is tightly fixed on the upper end cover (4-1) from top to bottom, and the upper end cover (4-1) is axially limited and fixed; the lower side of the lower pressing cover (4-4) is provided with a downwardly protruding lower pressing portion (4-41); the lower pressing cover (4-4) is tightly fixed on the lower end cover (4-2) from bottom to top, and the lower end cover (4-2) is axially limited and fixed; The upper bearing (5-1) is tightly fixed on the upper pressing portion (4-31) of the upper pressing cover (4-3) from top by its inner ring, and the lower bearing (5-2) is tightly fixed on the lower pressing portion (4-41) of the lower pressing cover (4-4) from bottom by its inner ring.

4. The electrical machine rotor according to one of claims 1 to 3, characterized in that: The cross section of the magnetic steel groove (2-1) of the rotor (2) is dovetail groove shape with large inside and small outside; the cross-sectional shape of the magnetic steel (3) corresponds to the magnetic steel groove (2-1), so that the magnetic steel (3) is embedded and fixed in the magnetic steel groove (2-1).

5. The electrical machine rotor according to one of claims 1 to 3, characterized in that: The magnetic steel (3) is adhesively fixed in the magnetic steel groove (2-1).

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