Magnetic tile with step groove

Abstract

A magnetic shoe with step grooves comprises a magnetic shoe body, the magnetic shoe body is in an arc-surface tile shape, the peripheral side edges comprise arc-surface short edges and straight-surface long edges, the arc-surface short edges are provided with the step grooves, and the upper arc surface close to the straight-surface long edges on the two sides is provided with a low-lying bevel angle area. The stepped grooves can be provided with different types of hollowed-out parts, different fixing structures can be designed on the rotor according to the stepped grooves and the different types of hollowed-out parts to fix the magnetic tiles, the binding force between the magnetic tiles and the rotor is increased, the problem that the magnetic tiles are thrown away and separated under the condition of high rotating speed is avoided, the stability of the structure is improved, and meanwhile the fixing structures are not arranged on the surfaces of the magnetic tiles. And the magnetic efficiency is not influenced.

Description

Technical Field

[0001] This utility model relates to the field of motor technology, and in particular to a magnetic tile with stepped grooves. Background Technology

[0002] One type of brushless external rotor motor requires the use of tile-type magnets. Traditional tile-type magnets have a small contact area during bonding or injection molding, resulting in low reliability.

[0003] Existing utility model patent CN2552235Y discloses a permanent magnet sheet for an external rotor DC motor. The working surface and the opposite surface of the magnet sheet are both convex arc surfaces. This utility model, by making both the working surface and the opposite surface of the magnet sheet convex arc surfaces (i.e., the cross-sectional shape of the magnet sheet is drum-shaped), adjusts the curvature of the arc surfaces of the working surface and the stator core teeth. This allows the air gap length between each tooth and the rotor surface to gradually increase circumferentially from the center of the tooth to the opening between two teeth. The air gap length at the opening between two teeth is a smaller average value. Therefore, the magnetic reluctance difference between adjacent teeth through the air gap is reduced. The electromagnetic force changes continuously due to the continuous change in the air gap and the decrease in the magnetic reluctance difference, effectively reducing abrupt changes in electromagnetic force and improving vibration and noise. This utility model is ingeniously designed, simple in structure, and has excellent performance. Utility Model Content

[0004] Traditional tile-type magnets have a small contact area during bonding or injection molding, resulting in low reliability. When the motor rotor is at high speed, the magnet pieces are prone to flying off and detaching, leading to motor damage.

[0005] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a magnetic tile with stepped groove, including a magnetic tile body, the magnetic tile body is in the shape of an arc-shaped tile, the sides of the four sides include an arc-shaped short side and a straight long side, a stepped groove is provided on the arc-shaped short side, and a low-lying angled area is provided on the upper arc surface near the straight long side on both sides.

[0006] Specifically, the main body of the magnetic tile includes an upper arc surface and a lower arc surface. The magnetic tile can be installed on a cylindrical rotor, with the lower arc surface fitting into the cylindrical rotor.

[0007] Specifically, the upper half of the short side of the curved surface is hollowed out to form a stepped groove. Specifically, the stepped groove can have a wavy hollowed-out design to form a wavy groove.

[0008] As a further improvement of this utility model, a semi-circular hollow can be provided on the stepped groove to form a semi-circular hole groove.

[0009] As a further improvement of this utility model, the middle section of the short side of the arc surface is hollowed out along the direction parallel to the arc surface to form a stepped groove.

[0010] As a further improvement of this utility model, the middle section of the upper arc surface and the lower arc surface of the magnetic tile have the same curvature and remain parallel, and the low-lying angled area of ​​the upper arc surface is sunken into the lower arc surface with a smooth curvature.

[0011] As a further improvement of this utility model, the magnetic tile body is installed on the rotor, and the rotor is provided with an envelope ring that matches the stepped groove to fix the magnetic tile. An envelope strip is provided on the outside of the rotor to cover the low-lying angled area for fixation.

[0012] The beneficial effects of this utility model are that after the magnetic tile with stepped groove is installed on the motor rotor, the bonding force between the magnetic tile and the rotor is increased by the stepped groove and the corresponding fixed structure on the rotor, which avoids the problem of the magnetic tile flying off at high speed and increases the stability of the structure. At the same time, the fixed structure is not set on the surface of the magnetic tile, so it will not affect the magnetic efficiency. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present utility model.

[0014] Figure 2 This is a structural schematic diagram of Embodiment 2 of the present invention.

[0015] Figure 3 This is a side view of Embodiment 2 of the present invention.

[0016] Figure 4 This is a side view of Embodiment 3 of the present invention.

[0017] Figure 5 This is a structural schematic diagram of Embodiment 4 of the present utility model.

[0018] In the diagram, 1 is the short side of the curved surface, 2 is the long side of the straight surface, 3 is the stepped groove, 4 is the wavy groove, 5 is the semi-circular hole groove, 6 is the stepped clamping groove, and 7 is the low-lying oblique angle area. Detailed Implementation

[0019] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] Example 1: A magnetic tile with stepped groove 3, such as Figure 1As shown, the device includes a magnetic tile body, which is shaped like an arc-shaped tile. Its sides include a short arc-shaped side 1 and a long straight side 2. The short arc-shaped side 1 has a stepped groove 3, and the upper arc-shaped surface near the two long straight sides has a low-lying angled area 7. The magnetic tile is used to install on the motor rotor to generate a stable magnetic field to drive the motor's rotation. The motor rotor is generally a cylindrical structure. The magnetic tile is installed on the outside of the motor rotor; therefore, the magnetic tile body is shaped like an arc-shaped tile, with the lower arc surface conforming to the surface of the motor rotor.

[0021] One type of brushless external rotor motor requires the use of tile-type magnets. Traditional tile-type magnets have a small contact area during bonding or injection molding, resulting in low reliability.

[0022] The existing surface-mount magnet mounting structure mainly involves directly gluing the magnets to the rotor laminations, and then adding a protective magnet ring on the outside. The protective magnet ring can ensure the stability of the magnet and rotor structure, protect the magnet, and prevent the magnet from detaching at high speeds. However, due to the addition of the protective magnet ring, the actual electrical air gap is relatively large, resulting in low air gap magnetic flux density, low power density, and an inability to achieve a very high upper speed limit.

[0023] Besides the structures described above, existing surface-mount magnet mounting structures can also directly glue the magnets onto the rotor laminations without an external protective magnetic ring. This structure, lacking the gap of the protective magnetic ring, offers better magnetic performance, but it can only be used in low-speed environments (below 6000 RPM). At high speeds, the adhesive force alone is insufficient to secure the magnets, easily leading to magnets flying off and detaching, causing motor damage.

[0024] In this embodiment, after installation, the short curved side 1 of the magnetic tile fits against both ends close to the motor rotor, and the long straight side 2 fits against the surface of the motor rotor along the axial direction of the motor rotor. A stepped groove 3 is provided on the short curved side 1. The motor rotor can be provided with a groove-shaped fixing structure along the axial direction to engage the long straight side 2 of the magnetic tile. At the same time, a fixing structure that cooperates with the stepped groove 3 can be provided on the end face to fix the magnetic tile.

[0025] The upper half of the short side 1 of the arc surface is hollowed out to form a stepped groove 3. A locking tooth structure that engages with the stepped groove 3 can be provided on the end face of the motor rotor to secure it to the magnetic tile. An envelope structure is provided on the outside of the rotor to cover the low-lying angled area 7 for fixation. When the motor rotor operates at high speed, the magnetic tile is prone to flying off. The stepped groove 3 and the correspondingly shaped fixing structure can increase the bonding force between the magnetic tile and the motor rotor, preventing the magnetic tile from flying off. Simultaneously, because the fixing structure is located on the end face of the motor rotor, the magnetic tile is directly exposed, and the magnetic density and magnetic efficiency of the magnetic force between the magnetic tile and the stator are not affected. This allows the motor rotor to have a higher upper speed limit, while also ensuring the stability of the magnetic tile and motor rotor structure at high speeds.

[0026] A clamping ring can also be installed on the end face of the motor rotor to fix the magnet. The clamping ring has a locking structure that engages with the stepped groove 3 of the arc-shaped short side 1. After the magnet is attached to the surface of the motor rotor, the clamping ring fits onto the arc-shaped short side 1 of the magnet, and the locking teeth on the clamping ring and the stepped groove 3 engage accordingly, firmly fixing the magnet to the outer surface of the motor rotor. The engagement of the clamping ring and the stepped groove 3 increases the bonding force between the magnet and the motor rotor, preventing the magnet from flying off. At the same time, since the clamping ring is located on the end face of the motor rotor, the magnet is directly exposed, and the magnetic density and magnetic efficiency of the magnetic force between the magnet and the stator are not affected, allowing the motor rotor to have a higher upper speed limit, while also ensuring the stability of the magnet and motor rotor structure at high speeds.

[0027] An envelope fixing structure can also be set around the magnet on the outside of the rotor. The envelope fixing structure covers the low-lying angled area 7 of the magnet. The upper arc surface of the magnet and the envelope fixing structure together form the outermost arc surface of the rotor. The envelope fixing structure helps to fix the magnet and prevents the magnet from flying off at high speed.

[0028] Example 2: A magnetic tile with stepped groove 3, such as Figure 2 and Figure 3 As shown, the device includes a magnetic tile body, which is shaped like an arc-shaped tile. Its sides include a short arc-shaped side 1 and a long straight side 2. A stepped groove 3 is provided on the short arc-shaped side 1. The magnetic tile is used to install on the motor rotor to generate a stable magnetic field to drive the motor's rotation. The motor rotor is generally a cylindrical structure. The magnetic tile is installed on the outside of the motor rotor; therefore, the magnetic tile body is shaped like an arc-shaped tile, with its lower arc surface conforming to the surface of the motor rotor.

[0029] After installation, the short curved side 1 of the magnetic tile fits against both ends close to the motor rotor, and the long straight side 2 fits against the surface of the motor rotor along the axial direction. A stepped groove 3 is provided on the short curved side 1. The motor rotor can be provided with a groove-shaped fixing structure along the axial direction to engage the long straight side 2 of the magnetic tile. At the same time, a fixing structure that cooperates with the stepped groove 3 can be provided on the end face to fix the magnetic tile.

[0030] The upper half of the short side 1 of the arc surface is hollowed out to form a stepped groove 3. A wavy groove 4 is formed by a wavy cutout on the stepped groove 3. A wavy tooth structure that engages with the wavy groove 4 can be provided on the end face of the motor rotor to engage and fix it to the magnetic tile. When the motor rotor operates at high speed, the magnetic tile is prone to flying off. The stepped groove 3 and the correspondingly shaped fixing structure can increase the bonding force between the magnetic tile and the motor rotor, preventing the magnetic tile from flying off. At the same time, since the fixing structure is located on the end face of the motor rotor, the magnetic tile is directly exposed, and the magnetic density and magnetic efficiency of the magnetic force between the magnetic tile and the stator are not affected. This allows the motor rotor to have a higher upper speed limit, while also ensuring the stability of the magnetic tile and motor rotor structure at high speeds.

[0031] A clamping ring can be installed on the end face of the motor rotor to fix the magnet. The clamping ring has a locking structure that engages with the stepped groove 3 on the short side 1 of the arc surface. After the magnet is attached to the surface of the motor rotor, the clamping ring fits onto the short side 1 of the arc surface of the magnet. The wavy teeth on the clamping ring and the wavy groove 4 on the stepped groove 3 engage accordingly, firmly fixing the magnet to the outer surface of the motor rotor. The engagement of the clamping ring and the stepped groove 3 increases the bonding force between the magnet and the motor rotor, preventing the magnet from flying off. At the same time, since the clamping ring is located on the end face of the motor rotor, the magnet is directly exposed. The magnetic density and magnetic efficiency of the magnetic force between the magnet and the stator are not affected, allowing the motor rotor to have a higher upper speed limit, while also ensuring the stability of the magnet and motor rotor structure at high speeds.

[0032] Example 3: A magnetic tile with stepped groove 3, such as Figure 4 As shown, the device includes a magnetic tile body, which is shaped like an arc-shaped tile. Its sides include a short arc side 1 and a long straight side 2. A stepped groove 3 is provided on the short arc side 1. The magnetic tile is used to install on the motor rotor to generate a stable magnetic field to drive the motor's rotation. The motor rotor is generally a cylindrical structure. The magnetic tile is installed on the outside of the motor rotor; therefore, the magnetic tile body is shaped like an arc-shaped tile, with the lower arc surface conforming to the surface of the motor rotor. The upper and lower arc surfaces of the magnetic tile have the same curvature and remain parallel, ensuring uniform magnetic density in all directions on the magnetic tile.

[0033] After installation, the short curved side 1 of the magnetic tile fits against both ends close to the motor rotor, and the long straight side 2 fits against the surface of the motor rotor along the axial direction. A stepped groove 3 is provided on the short curved side 1. The motor rotor can be provided with a groove-shaped fixing structure along the axial direction to engage the long straight side 2 of the magnetic tile. At the same time, a fixing structure that cooperates with the stepped groove 3 can be provided on the end face to fix the magnetic tile.

[0034] The upper half of the short side 1 of the arc surface is hollowed out to form a stepped groove 3. A semi-circular hollow can be provided on the stepped groove 3 to form a semi-circular hole groove 5. A semi-circular locking tooth structure that matches the semi-circular hole groove 5 can be provided on the end face of the motor rotor to engage and fix it to the magnetic tile. Hoops can be provided on both end faces of the motor rotor, and the hoops have semi-circular locking tooth structures that match the semi-circular hole groove 5. After the magnetic tile is attached to the surface of the motor rotor, it is fixed by the hoops enclosing the stepped groove 3 of the magnetic tile on the outer side of the motor rotor end face. The semi-circular locking teeth on the hoops engage and fix it to the semi-circular hole groove 5, increasing the bonding force between the magnetic tile and the motor rotor. When the motor rotor operates at high speed, the magnets are prone to flying off. By fixing them with a clamp, not only can the bonding force between the magnets and the motor rotor be increased, preventing the magnets from flying off, but also, since the clamp is located on the end face of the motor rotor, the entire surface of the magnets is exposed. The magnetic density and magnetic efficiency of the magnetic force between the magnets and the stator are not affected, allowing the motor rotor to have a higher upper speed limit, while also ensuring the stability of the magnet and motor rotor structure at high speeds.

[0035] Example 4: A magnetic tile with stepped groove 3, such as Figure 5 As shown, the device includes a magnetic tile body, which is shaped like an arc-shaped tile. Its sides include a short arc side 1 and a long straight side 2. A stepped groove 3 is provided on the short arc side 1. The magnetic tile is used to install on the motor rotor to generate a stable magnetic field to drive the motor's rotation. The motor rotor is generally a cylindrical structure. The magnetic tile is installed on the outside of the motor rotor; therefore, the magnetic tile body is shaped like an arc-shaped tile, with the lower arc surface conforming to the surface of the motor rotor. The upper and lower arc surfaces of the magnetic tile have the same curvature and remain parallel, ensuring uniform magnetic density in all directions on the magnetic tile.

[0036] After installation, the short curved side 1 of the magnetic tile fits against both ends close to the motor rotor, and the long straight side 2 fits against the surface of the motor rotor along the axial direction. A stepped groove 3 is provided on the short curved side 1. The motor rotor can be provided with a groove-shaped fixing structure along the axial direction to engage the long straight side 2 of the magnetic tile. At the same time, a fixing structure that cooperates with the stepped groove 3 can be provided on the end face to fix the magnetic tile.

[0037] The middle section of the short side 1 of the arc surface is hollowed out along the direction parallel to the arc surface, forming a stepped clamping groove 6. A fixing structure matching the stepped clamping groove 6 can be provided on the end face of the motor rotor to engage and fix it to the magnetic tile. Fixing structures matching the stepped clamping groove 6 are provided on both end faces of the motor rotor. After the magnetic tile is attached to the surface of the motor rotor, the fixing structure engages the stepped clamping groove 6 of the magnetic tile on the outer side of the motor rotor end face, forming a fixation and increasing the bonding force between the magnetic tile and the motor rotor. When the motor rotor operates at high speed, the magnetic tile is prone to flying off. The fixing structure not only increases the bonding force between the magnetic tile and the motor rotor, preventing the magnetic tile from flying off, but also, because the fixing structure is located on the end face of the motor rotor, the entire surface of the magnetic tile is exposed. The magnetic density and magnetic efficiency of the magnetic force between the magnetic tile and the stator are not affected, allowing the motor rotor to have a higher upper speed limit, while also ensuring the stability of the magnetic tile and motor rotor structure at high speeds.

[0038] A clamping ring can also be installed on the end face of the motor rotor to fix the magnet. The clamping ring has a locking structure that engages with the stepped groove 6 on the short side 1 of the arc surface. After the magnet is attached to the surface of the motor rotor, the clamping ring fits onto the short side 1 of the arc surface of the magnet, and the locking teeth on the clamping ring and the stepped groove 6 engage accordingly, firmly fixing the magnet to the outer surface of the motor rotor. The engagement of the clamping ring and the stepped groove 6 increases the bonding force between the magnet and the motor rotor, preventing the magnet from flying off. At the same time, since the clamping ring is located on the end face of the motor rotor, the magnet is directly exposed, and the magnetic density and magnetic efficiency of the magnetic force between the magnet and the stator are not affected, allowing the motor rotor to have a higher upper speed limit, while also ensuring the stability of the magnet and motor rotor structure at high speeds.

[0039] The above specific embodiments are merely preferred embodiments of this utility model, and are not intended to limit the specific implementation structure and scope of this utility model. In fact, some equivalent changes can be made according to the shape, structure, and design purpose of this utility model. Therefore, all equivalent changes made according to the shape, structure, and design purpose of this utility model should be included within the protection scope of this utility model, that is, these equivalent changes should all be protected by this utility model.

Claims

1. A magnetic tile with stepped grooves, characterized in that, It includes a magnetic tile body, which is in the shape of an arc-shaped tile. The sides of the magnetic tile body include an arc-shaped short side and a straight long side. The arc-shaped short side is provided with a stepped groove. The magnetic tile body includes an upper arc surface and a lower arc surface. The magnetic tile is installed on a cylindrical rotor, and the lower arc surface is in contact with the cylindrical rotor.

2. The magnetic tile with stepped groove according to claim 1, characterized in that, The main body of the magnetic tile has a low-lying angled area on the upper arc surface near the long straight side on both sides.

3. The magnetic tile with stepped groove according to claim 1, characterized in that, The upper half of the short side of the curved surface is hollowed out to form a stepped groove.

4. The magnetic tile with stepped groove according to claim 1 or 3, characterized in that, The stepped groove has a wave-shaped hollow, forming a wave groove.

5. The magnetic tile with stepped groove according to claim 1 or 3, characterized in that, The stepped groove has a semi-circular cutout, forming a semi-circular hole groove.

6. The magnetic tile with stepped groove according to claim 1, characterized in that, The middle section of the short side of the arc surface has a hollowed-out section along the direction parallel to the arc surface, forming a stepped groove.

7. The magnetic tile with stepped groove according to claim 1 or 2, characterized in that, The middle section of the upper arc surface and the lower arc surface of the magnetic tile have the same curvature and remain parallel. The low-lying angled area of ​​the upper arc surface sinks down into the lower arc surface with a smooth curvature.

8. The magnetic tile with stepped groove according to claim 2, characterized in that, The main body of the magnetic tile is installed on the rotor. The rotor is equipped with an envelope ring that matches the stepped groove to fix the magnetic tile. An envelope strip is provided on the outside of the rotor to cover the low-lying angled area for fixation.

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