A micro motor housing assembly with an integral magnetic ring and a laminated core

Abstract

The utility model discloses a kind of miniature motor machine shell assemblies with integral magnetic ring and laminated core, and the component aims at solving the problem of the existing miniature permanent magnet motor using two magnetic tiles as permanent magnet, and using integral core structure, affecting motor performance. The component includes motor shell, magnetic tile installed in the inside of motor shell, rotor assembly, brush assembly, magnetic tile is the whole annular structure, rotor assembly includes shaft, laminated core installed on the outer surface of shaft, and laminated core includes multiple core iron sheet. The utility model replaces split magnetic tile by integral annular magnetic tile, so that the magnetic tile 360 in motor inside Degree magnetic circuit is continuous, there is no magnetic force breakpoint, there is no joint, and rotor assembly is introduced into core lamination structure, so as to reduce iron loss and improve magnetic circuit efficiency, utilize the positioning step groove of machine shell and annular magnetic tile, core lamination forms integrated magnetic circuit optimization system, and improve motor performance.

Description

Technical Field

[0001] This utility model belongs to the field of micro permanent magnet motor technology, specifically relating to a micro motor housing assembly with an integral magnetic ring and a laminated iron core. Background Technology

[0002] In the rapid development of modern industry and technology, miniature permanent magnet motors, as key devices for converting electrical energy into mechanical energy, are widely used in many fields such as industrial production, transportation, and household appliances. Their performance directly affects the operational efficiency and quality of each field. The iron core and magnets, as one of the core components of the motor, play a decisive role in its performance.

[0003] Existing micro permanent magnet motors typically use two magnetic tiles as permanent magnets. The inconsistent gaps between the magnetic tiles and the housing affect air gap uniformity, and assembly errors are significant. It's difficult to control the consistency of the magnetic tile height, angle, and bonding position. Furthermore, the magnetic flux density is discontinuous, with a discontinuous region between the two magnetic tiles, resulting in high vibration and noise levels in the motor. Additionally, the motor uses a monolithic iron core structure. Under the influence of an alternating magnetic field, this monolithic iron core forms large eddy current loops, causing a significant amount of electrical energy to be lost as heat. This not only reduces the motor's energy efficiency but also increases the operating temperature, affecting the motor's stability and lifespan. Utility Model Content

[0004] (1) Technical problems to be solved To address the shortcomings of existing technologies, the purpose of this utility model is to provide a micro motor housing assembly with an integral magnetic ring and a laminated iron core. This assembly aims to solve the problem that existing micro permanent magnet motors use two magnetic tiles as permanent magnets and adopt an integral iron core structure, which affects motor performance.

[0005] (2) Technical solution To solve the above-mentioned technical problems, this utility model provides a micro motor housing assembly with an integral magnetic ring and a laminated iron core. The assembly includes a motor housing, a magnetic tile installed inside the motor housing, a rotor assembly, and a brush assembly. The magnetic tile has an integral circular ring structure. The rotor assembly includes a rotating shaft and a laminated iron core installed on the outer surface of the rotating shaft. The laminated iron core includes multiple iron core plates. The end of the rotating shaft near the brush assembly is installed on the commutator.

[0006] Preferably, the laminated iron core is fixed by riveting or hot riveting, and the thickness of the iron core sheets is 0.15–0.35 mm.

[0007] Furthermore, a mounting hole is provided in the middle of the laminated iron core, and three toothed grooves are provided on the inner circumference of the mounting hole.

[0008] Furthermore, the motor housing includes a cylindrical housing and a rear cover mounted on one end of the housing. The brush assembly is mounted on the rear cover. The rotating shaft is rotatably connected between the housing and the rear cover via a bearing. An oil baffle is fixedly connected to the end of the rotating shaft near the commutator.

[0009] Furthermore, a positioning step groove is provided inward at one end of the housing near the rear cover, and the magnetic tile is fixedly connected in the positioning step groove.

[0010] Furthermore, the magnetic tile is fixed to the positioning step groove of the housing by filling it with glue.

[0011] Furthermore, the adhesive is a structural adhesive or epoxy adhesive.

[0012] Furthermore, the thickness of the adhesive is 0.02–0.20 mm.

[0013] Furthermore, adjacent iron core sheets are stacked in staggered 1-3 sheets around the center of the stacked iron core at a 120° angle.

[0014] (3) Beneficial effects Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model replaces the separate magnetic tiles with an integral annular magnetic tile, so that the magnetic circuit of the magnetic tile inside the motor is continuous in 360°, with the same magnetic pole area distribution, uniform magnetic flux density, no magnetic breakpoints, and no seams, which improves the continuity of the motor's magnetic circuit and the consistency of assembly. Furthermore, the annular magnetic tile is fixed to the housing with glue, which improves reliability and assembly efficiency. 2. This utility model introduces the rotor assembly into the core lamination structure, and the adjacent laminations are staggered and stacked around the axis at 120°, thereby reducing iron loss and improving magnetic circuit efficiency. The positioning step groove of the housing, together with the annular magnetic tiles and core laminations, form an integrated magnetic circuit optimization system, which improves motor performance. Attached Figure Description

[0015] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0016] Figure 2 This is a front view cross-sectional structural diagram of this utility model.

[0017] Figure 3 This is a schematic diagram of the right-side cross-sectional structure of this utility model.

[0018] Figure 4 This is a schematic diagram of the rotor assembly of this utility model.

[0019] Figure 5 This is a schematic diagram of the stacked structure of the laminated iron core of this utility model.

[0020] Figure 6 This is a schematic diagram of the left-side structure of the laminated iron core of this utility model.

[0021] The markings in the attached diagram are as follows: 1. Motor housing; 2. Magnet; 3. Rotor assembly; 4. Brush assembly; 5. Shaft; 6. Laminated iron core; 7. Mounting hole; 8. Gear groove; 9. Commutator; 10. Oil baffle; 11. Housing; 12. Rear cover; 14. Positioning step groove; 15. Glue; 16. Riveting point. Detailed Implementation

[0022] Example 1 This specific embodiment is a micro motor housing assembly with an integral magnetic ring and a laminated iron core, as shown in the schematic diagram below. Figures 1-6 As shown, the assembly includes a motor housing 1, a magnet 2 installed inside the motor housing 1, a rotor assembly 3, and a brush assembly 4. The brush assembly 4 is used to rotate the rotor assembly 3. The magnet 2 is an integral circular ring structure. The rotor assembly 3 includes a rotating shaft 5 and a laminated iron core 6 installed on the outer surface of the rotating shaft 5. The laminated iron core 6 includes multiple iron core sheets. The end of the rotating shaft 5 near the brush assembly 4 is installed on the commutator 9. The multiple iron core sheets of the laminated iron core 6 are laminated in the same direction, that is, each iron core sheet does not rotate or shift in the circumferential direction when stacked. The advantages of this structure are simple lamination positioning, high riveting efficiency, and good iron core consistency. It is the most efficient assembly method. By replacing the separate magnetic tiles 2 with an integral annular magnetic tile 2, the magnetic tile 2 inside the motor can achieve 360° magnetic circuit continuity, uniform magnetic flux density, and no magnetic discontinuities. The laminated iron core 6 is formed by stacking multiple iron core sheets and is isolated by an insulation layer. In AC or high-frequency applications, alternating magnetic fields will generate eddy currents in the iron core, leading to energy loss and heat generation. The laminated iron core 6 structure significantly reduces eddy current losses by cutting off the closed path of eddy currents, thereby improving motor efficiency. At the same time, the laminated iron core 6 can form a clearer magnetic conduction circuit, reduce magnetic resistance, optimize magnetic circuit performance, and help the motor transmit the magnetic field more efficiently during operation, thus improving overall performance.

[0023] like Figure 5 and Figure 6 As shown: In this embodiment, the laminated iron core 6 is fixed by riveting or hot riveting. The core iron sheets of the laminated iron core 6 are provided with three riveting points 16 around their circumference to prevent relative slippage between adjacent core iron sheets. The thickness of the core iron sheets is 0.15–0.35 mm.

[0024] like Figure 2 , Figure 4 and Figure 6 As shown: In this embodiment, a mounting hole 7 is provided in the middle of the laminated iron core 6, and three toothed grooves 8 are provided on the inner circumference of the mounting hole 7.

[0025] like Figure 2 and Figure 4 As shown: In this embodiment, the motor housing 1 includes a cylindrical housing 11 and a rear cover 12 installed at one end of the housing 11. The brush assembly 4 is installed on the rear cover 12. The rotating shaft 5 is rotatably connected between the housing 11 and the rear cover 12 through a bearing. An oil baffle 10 is fixedly connected to one end of the rotating shaft 5 near the commutator 9.

[0026] like Figure 1 and Figure 2 As shown: In this embodiment, a positioning step groove 14 is provided inward at one end of the housing 11 near the rear cover 12, and the magnetic tile 2 is fixedly connected in the positioning step groove 14; the magnetic tile 2 is positioned by the positioning step groove 14 and is no longer affected by uneven thickness, and the overall high-performance rare earth annular magnetic tile 2 can avoid magnetic flux distortion.

[0027] like Figure 2 and Figure 3 As shown: In this embodiment, the magnetic tile 2 and the positioning step groove 14 of the housing 11 are filled and fixed with glue 15, which can realize the automatic alignment of the magnetic ring. The glue layer formed by the glue 15 can also absorb vibration and reduce noise, further improving the fixing reliability, which is superior to the structure of two magnetic tiles 2.

[0028] In this embodiment, the adhesive 15 is a structural adhesive or epoxy adhesive, and the thickness of the adhesive 15 is 0.02–0.20 mm; in this way, the magnetic tile 2 is firmly fixed to the housing 11, and has high bonding strength, chemical corrosion resistance, temperature resistance and durability.

[0029] Example 2 like Figure 5 and Figure 6 As shown: The difference from Embodiment 1 is that: adjacent iron core sheets are stacked in staggered arrangement at 1-3 sheets around the center of the laminated iron core 6 at a rotation axis 5 at 120°, that is, there is a fixed angle of rotational offset between each layer and the next layer in the circumferential direction, realizing a three-layer staggered arrangement structure with 360° circumferential division. The staggered stacking method has the best electromagnetic performance. The laminated iron core 6 forms three sets of periodically repeating three-layer structures, so that the phase of the slots 8 of the whole iron core is evenly distributed in the circumference. When adjacent iron chips are stacked at a 120° angle, the position of the slots 8 is evenly distributed in the circumference and no longer stacked in the same position, avoiding the occurrence of magnetic flux bottleneck area. The distribution of magnetic field lines changes from "concentrated" to "dispersed", reducing the local peak of magnetic flux and making the overall magnetic circuit more uniform. The inertial distribution of the rotor assembly 3 tends to be ideally symmetrical, the rotational balance is improved, the torque waveform changes from "peak" to "smooth", and the torque decreases. Furthermore, electromagnetic losses are significantly reduced, the precision of the center hole is improved, high-frequency rotational heating is reduced, which is beneficial for high-speed operation, iron loss is reduced by 15-25%, and torque density is increased by 8-15%. By adopting a 120° staggered laminated structure, the following effects are achieved: 1. Disperse the magnetic flux concentration area, reducing the peak magnetic flux density by 10–18%; 2. Torque is significantly reduced, with peak torque decreasing by approximately 15–30%; 3. Reduce electromagnetic noise by 1.5–3 dB within the measured range; 4. Improves rotational balance, reducing vibration by 20-40% at high speeds; 5. Reduces local iron loss and heat generation, lowering the temperature rise by approximately 3–6°C.

[0030] Working principle: The positioning step groove 14 is formed in one step by stretching the inner wall of the housing 11. Then, the entire annular magnetic tile 2 is pressed into the housing 11, and its position is determined by the positioning step groove 14. It is filled and fixed with glue 15, so that the outer periphery of the magnetic tile 2 and the inner wall of the housing 11 form a uniform gap to achieve a consistent air gap. Then, multiple laminated iron cores 6 are stacked on the rotating shaft 5 in a staggered manner to form a rotor assembly 3, which is installed inside the housing 11. The outer shape of the laminated iron core 6 and the inner diameter of the magnetic tile 2 form a high-quality magnetic flux path. Finally, the back cover 12 is installed to complete the whole structure. The performance of the micro motor housing assembly with an integral magnetic ring and laminated iron core is as follows: Air gap consistency, 30-50%; torque density, 10-20%; efficiency, 5-12%; torque density, 10-20%; lifespan, 10-20%; all have increased.

[0031] Iron loss decreased by 15-25%; noise level decreased by 3-6 dB; both decreased.

[0032] All technical features in this embodiment can be freely combined according to actual needs.

[0033] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this technical solution are within the protection scope of this utility model.

Claims

1. A micro motor housing assembly having an integral magnetic ring and a laminated iron core, the assembly comprising a motor housing (1), magnetic tiles (2) installed inside the motor housing (1), a rotor assembly (3), and a brush assembly (4), characterized in that: The magnetic tile (2) is an integral circular ring structure. The rotor assembly (3) includes a rotating shaft (5) and a laminated iron core (6) mounted on the outer surface of the rotating shaft (5). The laminated iron core (6) includes multiple iron core sheets. The end of the rotating shaft (5) near the brush assembly (4) is mounted on the commutator (9).

2. The micro motor housing assembly with an integral magnetic ring and a laminated iron core according to claim 1, characterized in that, The laminated iron core (6) is fixed by riveting or hot riveting, and the thickness of the iron core sheet is 0.15–0.35 mm.

3. The micro motor housing assembly with an integral magnetic ring and a laminated iron core according to claim 2, characterized in that, The laminated iron core (6) has a mounting hole (7) in the middle, and the inner wall of the mounting hole (7) has three toothed grooves (8).

4. The micro motor housing assembly with an integral magnetic ring and a laminated iron core according to claim 1, characterized in that, The motor housing (1) includes a cylindrical housing (11) and a rear cover (12) installed at one end of the housing (11). The brush assembly (4) is installed on the rear cover (12). The rotating shaft (5) is rotatably connected between the housing (11) and the rear cover (12) through a bearing. An oil baffle (10) is fixedly connected to one end of the rotating shaft (5) near the commutator (9).

5. The micro motor housing assembly with an integral magnetic ring and a laminated iron core according to claim 4, characterized in that, The housing (11) has a positioning step groove (14) at one end near the rear cover (12), and the magnetic tile (2) is fixedly connected in the positioning step groove (14).

6. The micro motor housing assembly with an integral magnetic ring and a laminated iron core according to claim 5, characterized in that, The magnetic tile (2) is fixed to the positioning step groove (14) of the housing (11) by filling with glue (15).

7. The micro motor housing assembly with an integral magnetic ring and a laminated iron core according to claim 6, characterized in that, The adhesive (15) is a structural adhesive or an epoxy adhesive.

8. The micro motor housing assembly with an integral magnetic ring and a laminated iron core according to claim 7, characterized in that, The thickness of the adhesive (15) is 0.02–0.20 mm.

9. The micro motor housing assembly with an integral magnetic ring and a laminated iron core according to claim 1, characterized in that, The adjacent iron core sheets are stacked in staggered order at 1-3 sheets around the center of the stacked iron core (6) at 120° angles.

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