Straight line and arc smooth transition magnetic field structure

Abstract

The utility model discloses a linear and arc smooth transition magnetic field structure, which comprises a motor base, a casing, a permanent magnet block and a stator core, the permanent magnet block comprises a fixed ring, a bump, a magnetic shoe and a clamping groove, the bump is installed on the side wall of the fixed ring, the inner side wall of the casing is provided with a positioning groove, the bump can be inserted and installed in the positioning groove, the inner side wall of the fixed ring is provided with the clamping groove, and the magnetic shoe is inserted into the clamping groove. An air gap magnetic field formed in the device is composed of a straight surface of one side, close to the iron core, of the magnetic shoe and an arc surface on the outer side of the iron core, after the device is started, when the magnetic shoe moves to the position above the convex teeth from the position between the two convex teeth, through the gap of the air gap magnetic field from large to small, the magnetic shoe is clamped in the clamping groove, and the magnetic shoe is fixed. The air gap flux density is from low to high; when the magnetic shoe moves to the position between the two convex teeth from the position above the convex teeth, the gap of an air-gap magnetic field increases, the air-gap flux density decreases, and the operation is repeated, so that the motor cutting magnetic field enters and leaves softly, the operation is stable, and the electromagnetic noise is obviously improved.

Description

Technical Field

[0001] This patent relates to the technical field of permanent magnet DC motors, and specifically to a magnetic field structure with a smooth transition between a straight line and an arc. Background Art

[0002] Currently, for most automotive brushed blower motors, the magnetic field transition of the eccentric magnetic tiles with arcs facing arcs is used to change the air gap magnetic field. The reduction and avoidance of electromagnetic noise are not ideal. Moreover, for current new energy vehicles, in order to reduce the weight of the whole vehicle, they are relatively weak in dealing with environmental noise. At the same time, with the progress of the times, vehicle users' requirements for the driving environment are further improved, and the noise standards for air conditioning blowers are becoming more and more strict. Therefore, a magnetic field structure that can achieve a smooth transition and effectively control electromagnetic noise is needed. Summary of the Invention

[0003] The purpose of this patent is to provide a magnetic field structure with a smooth transition between a straight line and an arc to solve the problems raised in the above background art.

[0004] To achieve the above purpose, this patent provides the following technical solution: A magnetic field structure with a smooth transition between a straight line and an arc, including a motor base, a housing, permanent magnet blocks, and a stator core. The housing is rotatably installed on the side wall of the motor base. Permanent magnet blocks are installed on the inner side wall of the housing. The stator core is installed on the side wall of the motor base and can be inserted into the interior of the housing. The permanent magnet blocks are arranged on the outer side of the stator core;

[0005] The permanent magnet block includes a fixing ring, a convex block, a magnetic tile, and a card slot. The fixing ring is inserted and installed in the housing. The convex block is installed on the side wall of the fixing ring. A positioning groove is formed on the inner side wall of the housing, and the convex block can be inserted and installed in the positioning groove. A card slot is formed on the inner side wall of the fixing ring, and the magnetic tile is snapped into the card slot;

[0006] The side of the magnetic tile close to the stator core is a plane.

[0007] Preferably, the stator core includes an iron core and a wire winding. The iron core is installed on the side wall of the motor base, and the wire winding is wound around the outer side of the iron core.

[0008] Preferably, convex teeth are provided on the outer side of the iron core. There are 12 convex teeth in total, and the wire winding is wound around the outer sides of the 12 convex teeth. The wire winding is made of enameled wire.

[0009] Preferably, a sliding groove is formed on the side wall of the convex block. A positioning pin is slidably installed in the sliding groove. One end of a spring is installed on the side wall of the positioning pin, and the other end of the spring is in contact with the inner wall of the sliding groove. A connection hole is formed on the inner side wall of the positioning groove, and the positioning pin can be inserted into the connection hole.

[0010] Preferably, ventilation holes are provided on both the motor base and the side wall of the housing, and the magnetic poles of two adjacent magnetic tiles on the side close to the stator core are opposite.

[0011] Preferably, a drive shaft is inserted and installed on the side wall of the housing, a bearing is installed in the middle of the stator core, and one end of the drive shaft located inside the housing is inserted and installed in the bearing.

[0012] Compared with the prior art, the beneficial effects of this patent are:

[0013] The air-gap magnetic field formed in this device is composed of the straight surface of the magnetic tile close to the iron core and the arc surface outside the iron core. After this device is started, when the magnetic tile moves from between the two convex teeth to above the convex teeth, through the air-gap magnetic field, the gap changes from large to small, and the air-gap magnetic density changes from low to high; when the magnetic tile moves from above the convex teeth to between the two convex teeth, the air-gap magnetic field gap changes from small to large, and the air-gap magnetic density changes from high to low, repeating in a cycle, enabling the motor to cut the magnetic field gently when entering and leaving, running smoothly, and significantly improving the electromagnetic noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic structural diagram of this patent.

[0015] Figure 2 It is a schematic diagram of the internal structure of the housing of this patent.

[0016] Figure 3 It is a schematic diagram of the magnetic tile structure of this patent.

[0017] Figure 4 is Figure 2 The schematic diagram of the structure at position A in

[0018] In the figure: 1 motor base, 2 housing, 3 permanent magnet block, 31 fixing ring, 32 convex block, 33 magnetic tile, 34 card slot, 4 stator core, 41 iron core, 42 wire winding, 5 positioning slot, 6 convex tooth, 7 sliding slot, 8 positioning pin, 9 spring, 10 connecting hole, 11 ventilation hole, 12 drive shaft, 13 bearing. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] Next, the technical solutions in the embodiments of this patent will be clearly and completely described in conjunction with the drawings in the embodiments of this patent. Obviously, the described embodiments are only a part of the embodiments of this patent, rather than all the embodiments. Based on the embodiments in this patent, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of this patent.

[0020] Please refer to Figures 1-4, this patent provides a technical solution: a magnetic field structure with a smooth transition between a straight line and an arc, including a motor base 1, a housing 2, a permanent magnet block 3, and a stator core 4. The side wall of the motor base 1 is rotatably installed with the housing 2. The inner side wall of the housing 2 is installed with the permanent magnet block 3. The side wall of the motor base 1 is installed with the stator core 4. The stator core 4 can be inserted into the interior of the housing 2. The permanent magnet block 3 is arranged on the outside of the stator core 4;

[0021] The magnetic field structure proposed in this article belongs to the internal structure of a permanent magnet brushless DC motor. After the wire winding 42 in the stator core 4 is powered on, the housing 2 can drive the drive shaft 12 to rotate;

[0022] The permanent magnet block 3 includes a fixing ring 31, a convex block 32, a magnetic tile 33, and a card slot 34. The fixing ring 31 is inserted and installed in the housing 2. The side wall of the fixing ring 31 is installed with the convex block 32. A positioning groove 5 is opened on the inner side wall of the housing 2. The convex block 32 can be inserted and installed in the positioning groove 5. A card slot 34 is opened on the inner side wall of the fixing ring 31. The magnetic tile 33 is snapped into the interior of the card slot 34;

[0023] In this article, a total of 10 magnetic tiles 33 are provided. The setting of ten magnetic tiles 33 and twelve convex teeth 6 can prevent the magnetic tiles 33 from being aligned with the wire windings outside the convex teeth 6, so that the housing 2 can rotate on the motor base 1;

[0024] The setting of the fixing ring 31 and the card slot 34 can prevent the position of the magnetic tile 33 from shifting, ensuring the stability of the internal magnetic field of this device;

[0025] The side of the magnetic tile 33 close to the stator core 4 is a plane;

[0026] During the process of the magnetic tile 33 moving from between the two convex teeth 6 to above the convex teeth 6, the gap of the air-gap magnetic field will change from large to small, making the air-gap magnetic density increase from low to high; during the process of the magnetic tile 33 moving from above the convex teeth 6 to between the two convex teeth 6, the air-gap magnetic field gap changes from small to large, and the air-gap magnetic density decreases from high to low, cycling repeatedly, making the motor cut the magnetic field gently enter and leave, making the operation smoother, and thus significantly improving the electromagnetic noise.

[0027] Specifically, the stator core 4 includes a core 41 and a wire winding 42. The core 41 is installed on the side wall of the motor base 1, and the wire winding 42 is wound and installed on the outside of the core 41.

[0028] Specifically, convex teeth 6 are provided on the outside of the core 41. A total of 12 convex teeth 6 are provided. The wire winding 42 is wound and installed on the outside of the 12 convex teeth 6. The wire winding 42 is made of enameled wire;

[0029] The core 41 is made of multiple layers of mutually insulated thin sheets pressed together, which can reduce the eddy current inside the motor;

[0030] The arrangement of the enameled wire enables the current to flow completely through the entire wire, resulting in a strong magnetic field.

[0031] Specifically, a sliding groove 7 is formed in the side wall of the bump 32. A positioning pin 8 is slidably installed in the sliding groove 7. One end of a spring 9 is installed on the side wall of the positioning pin 8, and the other end of the spring 9 is in contact with the inner wall of the sliding groove 7. A connection hole 10 is formed in the inner side wall of the positioning groove 5, and the positioning pin 8 can be inserted into the connection hole 10.

[0032] The arrangement of the positioning pin 8 and the connection hole 10 can prevent the position of the fixing ring 31 from moving, which may cause a change in the internal magnetic field of the device and affect the operation of the motor.

[0033] Specifically, ventilation holes 11 are formed in the side walls of the motor base 1 and the housing 2. The magnetic poles of two adjacent magnetic tiles 33 on the side close to the stator core 4 are opposite.

[0034] By providing the ventilation holes 11 on the outside of the motor base 1 and the housing 2, the heat generated by the wire winding 42 can be dissipated through the ventilation holes 11, preventing the wire winding 42 from overheating, which may cause the external protective paint to melt and lead to a short circuit of the motor.

[0035] Specifically, a drive shaft 12 is inserted and installed in the side wall of the housing 2. A bearing 13 is installed in the middle of the stator core 4, and one end of the drive shaft 12 located inside the housing 2 is inserted and installed in the bearing 13.

[0036] The arrangement of the bearing 13 enables the drive shaft 12 to rotate with low friction and stability.

[0037] Working principle: The air-gap magnetic field formed in this device is composed of the straight surface of the magnetic tile 33 close to the iron core 41 and the arc surface outside the iron core 41. When the magnetic tile 33 moves from between the two convex teeth 6 to above the convex teeth 6, the air-gap magnetic field gap between the magnetic tile 33 and the iron core 41 changes from large to small, causing the air-gap magnetic density to increase from low to high. When the magnetic tile 33 moves from above the convex teeth 6 to between the two convex teeth 6, the air-gap magnetic field gap changes from small to large, and the air-gap magnetic density decreases from high to low. This cycle enables the motor to cut the magnetic field gently when entering and leaving, making the operation smoother and significantly improving the electromagnetic noise.

[0038] For those skilled in the art, it is obvious that this patent is not limited to the details of the above exemplary embodiments, and without departing from the spirit or basic characteristics of this patent, this patent can be implemented in other specific forms. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of this patent is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be embraced within this patent. Any reference signs in the claims should not be construed as limiting the claims involved.

[0039] In addition, it should be understood that although this specification is described in terms of embodiments, not every embodiment contains only one independent technical solution. This narrative manner of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A linear and circular arc smooth transition magnetic field structure, comprising a motor base (1), a housing (2), a permanent magnet block (3) and a stator core (4), characterized in that: The side wall of the motor base (1) is rotatably mounted with a casing (2), the inner side wall of the casing (2) is mounted with a permanent magnet block (3), the side wall of the motor base (1) is mounted with a stator core (4), the stator core (4) can be inserted into the casing (2), and the permanent magnet block (3) is arranged on the outside of the stator core (4); The permanent magnet block (3) comprises a fixing ring (31), a protrusion (32), a magnetic tile (33) and a clamping groove (34); the fixing ring (31) is inserted and installed in the housing (2); the side wall of the fixing ring (31) is installed with a protrusion (32); the inner side wall of the housing (2) is provided with a positioning groove (5); the protrusion (32) can be inserted and installed in the positioning groove (5); the inner side wall of the fixing ring (31) is provided with a clamping groove (34); the magnetic tile (33) is clamped and installed in the inner side wall of the fixing ring (31); The side of the magnetic tile (33) close to the stator core (4) is a plane.

2. A straight line and arc smooth transition magnetic field structure according to claim 1, characterized in that: The stator iron core (4) comprises an iron core (41) and a wire winding (42); the iron core (41) is mounted on a side wall of a motor base (1); and the wire winding (42) is wound around the outer side of the iron core (41).

3. The straight line and circular arc smooth transition magnetic field structure according to claim 2, characterized in that: The outer side of the iron core (41) is provided with convex teeth (6), and the convex teeth (6) are provided with 12 in total. The wire wrap winding (42) is wound and installed on the outer sides of the 12 convex teeth (6), and the wire wrap winding (42) uses enameled wire.

4. The straight line and arc smooth transition magnetic field structure according to claim 1, characterized in that: A slide groove (7) is provided on the side wall of the protrusion (32), a positioning pin (8) is slidably installed in the slide groove (7), one end of a spring (9) is installed on the side wall of the positioning pin (8), the other end of the spring (9) is in contact with the inner wall of the slide groove (7), and a connecting hole (10) is provided on the inner wall of the positioning groove (5), and the positioning pin (8) can be inserted into the connecting hole (10).

5. The straight line and arc smooth transition magnetic field structure according to claim 1, characterized in that: The motor base (1) and the side walls of the housing (2) are both provided with ventilation holes (11), and the magnetic poles of two adjacent magnetic tiles (33) on the side close to the stator core (4) are opposite.

6. The straight line and arc smooth transition magnetic field structure according to claim 1, characterized in that: A drive shaft (12) is inserted and installed in the side wall of the casing (2), a bearing (13) is installed in the middle of the stator core (4), and one end of the drive shaft (12) located inside the casing (2) is inserted and installed in the bearing (13).

Images