Axial magnetic field motor stator core

Abstract

The present invention discloses an axial magnetic field motor stator core, comprising a lower core and an upper core stacked up and down, wherein the lower core is used to set a copper wire winding, and the upper core is used to make the stator slot of the lower core form a closed slot. The axial magnetic field motor stator core provided by the present invention reduces the slot harmonics of the stator slot of the stator core, so that the stator slot can be suitable for copper wire windings of different structures, thereby providing a motor with better performance.

Description

Technical Field

[0001] The invention relates to the technical field of motors, and in particular to a stator core of an axial magnetic field motor. Background Art

[0002] The stator core 1 includes a stator yoke and a plurality of stator teeth 11. Figure 1 As shown, between the stator teeth 11 are stator slots 12 for placing copper wires.

[0003] The magnetic field of the motor when running is divided into fundamental wave and harmonic wave. The harmonic wave at the slot position of the stator slot 12 is very chaotic. If it is not processed, it will cause a large eddy current loss of the copper wire winding in the stator slot 12. At present, in order to reduce the harmonic wave of the slot position of the stator slot 12, the method of reducing the slot width of the stator slot 12 on the stator core 1 is generally adopted, that is, the slot width of the stator slot 12 is smaller than the width of the slot interior, as shown in the attached Figure 1 As shown in . The stator core 1 of this structure is only suitable for round copper wire windings, not for flat copper wire windings with better performance, and the motor performance is poor.

[0004] Therefore, how to provide an axial magnetic field motor stator core with fewer stator slot harmonics and suitable for copper wire windings of different structures has become a technical problem that needs to be urgently solved by technical personnel in this field. Summary of the invention

[0005] In view of this, the present invention provides an axial magnetic field motor stator core to reduce slot harmonics of stator slots of the stator core, and the stator slots can be suitable for copper wire windings of different structures.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] An axial magnetic field motor stator core comprises a lower core and an upper core stacked up and down, wherein the lower core is used to set a copper wire winding, and the upper core is used to make the stator slots of the lower core form closed slots.

[0008] Preferably, the lower iron core is provided with a first stator slot and a first stator tooth, and the upper iron core is provided with a second stator slot and a second stator tooth;

[0009] The first stator slot is used to place the copper wire winding, the second stator tooth and the first stator tooth have the same horizontal cross-sectional shape and size, and are arranged one-to-one when stacked, and the tooth surface of the first stator tooth is in contact with the yoke of the upper iron core.

[0010] Preferably, it also includes a shell for containing the lower iron core and the upper iron core and a fixing plate for fixing them, the upper end of the shell is provided with a first opening for placing the lower iron core and the upper iron core, the side of the shell is provided with a second opening for leading out the copper wire of the copper wire winding, and the fixing plate is used to press tightly on the upper iron core placed in the shell.

[0011] Preferably, a first through hole is provided at a center position of the bottom surface of the shell, and a second through hole is provided at a center position of the fixing plate, and the first through hole and the second through hole are used for passing the motor shaft.

[0012] Preferably, an annular positioning boss is arranged around the first through hole in the housing.

[0013] Preferably, a positioning through groove is provided on the fixing plate at a position corresponding to the second stator tooth, and the positioning through groove is matched with the second stator tooth.

[0014] Preferably, a protruding positioning portion is provided on the side of the fixing plate at the second opening, the width of the protruding positioning portion corresponds to the width of the second opening, and the protruding positioning portion is slidably connected in the second opening.

[0015] Preferably, the shell and the fixing plate are both made of non-magnetic conductive materials.

[0016] Preferably, a placement platform is provided on the inner side surface of the shell near the first opening, and the placement platform is used to place the fixing plate.

[0017] Preferably, a height of the second stator tooth is smaller than a height of the first stator tooth.

[0018] It can be seen from the above technical scheme that the present invention provides an axial magnetic field motor stator core, including a lower core and an upper core stacked up and down, the lower core is used to set the copper wire winding, and the upper core is used to make the stator slot of the lower core form a closed slot. By setting the upper core for sealing and conducting the magnetic circuit on the lower core, the stator slot on the lower core does not need to reduce the width of the slot position, so that the harmonics at the slot position of the stator slot of the lower core can be weakened, so that the slot of the stator slot of the lower core can be set with round copper wire windings or formed flat copper wire windings, so that the stator slot can be suitable for copper wire windings of different structures; and the performance of the flat copper wire winding is better than that of the round copper wire winding, therefore, it is also possible to provide an axial magnetic field motor with better performance. Compared with the stator core with a semi-open slot structure in the prior art, the stator core of the axial magnetic field motor of the present invention has fewer slot harmonics of the stator slot, and the stator slot can be suitable for copper wire windings of different structures, which can provide a stator core with better performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 It is a structural schematic diagram of a stator core in the prior art;

[0021] Figure 2 A schematic diagram of a stacked structure of a lower iron core and an upper iron core of a stator iron core provided in an embodiment of the present invention;

[0022] Figure 3 A schematic diagram of the structure of a lower iron core provided by an embodiment of the present invention;

[0023] Figure 4 A schematic diagram of the structure of an upper core provided by an embodiment of the present invention;

[0024] Figure 5 A schematic diagram of the structure of a housing provided by an embodiment of the present invention;

[0025] Figure 6 A schematic diagram of the structure of a fixing plate provided in an embodiment of the present invention;

[0026] Figure 7 A schematic diagram of a structure in which a lower iron core and an upper iron core provided in an embodiment of the present invention are placed in a housing;

[0027] Figure 8 A schematic diagram of the structure of a stator core after being fixed provided in an embodiment of the present invention.

[0028] 1. stator core, 11. stator teeth, 12. stator slots, 2. stator core, 21. upper core, 211. second stator teeth, 212. second stator slots, 22. lower core, 221. first stator teeth, 222. first stator slots, 23. copper wire windings, 24. housing, 241. first opening, 242. second opening, 243. placement table, 244. annular positioning boss, 245. first through hole, 246. bolt connection hole, 25. fixing plate, 251. raised positioning portion, 252. positioning through slot, 253. second through hole. DETAILED DESCRIPTION

[0029] The invention discloses an axial magnetic field motor stator core, which is used to reduce slot harmonics of stator slots of the stator core, and the stator slots can be suitable for copper wire windings with different structures.

[0030] like Figure 1As shown, the stator core 1 of the axial magnetic field motor in the prior art is provided with a notch (i.e., the opening between two adjacent stator teeth 11) at the stator slot 12 of the stator core 1, and the harmonics at the notch position of the stator core 1 are very messy. If not processed, it will cause the eddy current loss of the copper wire winding in the stator slot 12 to be large. At present, in order to reduce the harmonics of the notch of the stator slot 12, the method of reducing the notch width of the stator slot 12 on the stator core 1 is generally adopted. After reducing the notch width of the stator slot 12, the stator slot 12 is only suitable for round copper wire windings, but not for flat copper wire windings with better performance, thereby affecting the performance of the motor.

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figures 2 to 8 The present invention discloses an axial magnetic field motor stator core, comprising a lower core 22 and an upper core 21 stacked up and down.

[0033] Among them, the lower iron core 22 and the upper iron core 21 are both made of magnetic conductive materials. The lower iron core 22 is used to wind the copper wire winding 23, which is an effective stator iron core of the axial magnetic field motor. The upper iron core 21 is used to make the stator slots on the lower iron core 22 form closed slots, weaken the harmonics appearing at the slot position, and reduce the eddy current loss of the copper wire winding 23 in the stator slot. The copper wire winding 23 is not set on the upper iron core 21. The upper iron core 21 is used to seal the slots of the stator slots of the lower iron core 22 and conduct the magnetic circuit, and conduct magnetism through the stator tooth position on the upper iron core 21, so that the stator slots of the lower iron core 22 form a closed slot structure iron core. The upper iron core 21 is essentially a sealed magnetic conductive part used to close the slots of the stator slots. It can also be named by other names as long as it has the above functions.

[0034] The stator core of the axial magnetic field motor of the present invention is provided with an upper core 21 for sealing and conducting the magnetic circuit on the effective stator core, i.e., the lower core 22, so that the stator slots on the lower core 22 do not need to reduce the width of the slot position, that is, there is no need to use a semi-open slot structure (a positioning slot with a reduced width at the slot position), so that the harmonics at the slot position of the stator slots of the lower core 22 can be weakened, so that the slots of the stator slots of the lower core 22 can be provided with round copper wire windings or formed flat copper wire windings, and the performance of the flat copper wire windings is better than that of the round copper wire windings, so that an axial magnetic field motor with better performance can be provided. Compared with the stator core with a semi-open slot structure in the prior art, the stator core of the axial magnetic field motor of the present invention has fewer slot harmonics of the stator slots, and the stator slots can be suitable for copper wire windings 23 of different structures, which can provide a stator core with better performance, thereby making the motor performance better.

[0035] Specifically, the lower iron core 22 is provided with a first stator slot 222 and a first stator tooth 221, and the upper iron core 21 is provided with a second stator slot 212 and a second stator tooth 211. The first stator slot 222 is used to place the copper wire winding 23. In order to better seal the notch of the first stator slot 222 and conduct the magnetic circuit, thereby avoiding the generation of harmonics at the notch position of the first stator slot 222, the first stator slot 222 is arranged in a one-to-one correspondence with the second stator slot 212, the first stator tooth 221 is arranged in a one-to-one correspondence with the second stator tooth 211, and the horizontal cross-sectional shape and size of the first stator tooth 221 and the second stator tooth 211 are consistent. In order to facilitate the placement of the flat copper wire winding, the width of the notch of the first stator slot 222 and the width of the slot bottom are consistent. When stacked, the tooth surface of the first stator tooth 221 contacts the yoke of the upper iron core 21, and the first stator tooth 221 and the second stator tooth 211 are placed correspondingly.

[0036] In a specific embodiment, a housing 24 is further included, and the housing 24 is used to hold the stacked lower core 22 and the upper core 21. The upper end of the housing 24 is provided with a first opening 241 for placing the lower core 22 and the upper core 21, and the side of the housing 241 is provided with a second opening 242 for leading out the copper wire of the copper wire winding 23. In order to fix the lower core 22 and the upper core 21 stacked in the housing 24, a fixing plate 25 for pressing the lower core 22 and the upper core 21 is also included. When stacked, the yoke of the lower core 22 is placed close to the bottom surface of the housing 24, and the upper core 21 is placed on the tooth surface of the lower core 22.

[0037] The first through hole 245 is provided at the center of the bottom surface of the housing 24, and the second through hole 253 is provided at the center of the fixing plate 25. The first through hole 245 and the second through hole 253 are used for the motor shaft to pass through, and the shapes and positions of the first through hole 245 and the second through hole 253 correspond to the holes on the lower iron core 22 and the upper iron core 21.

[0038] Furthermore, an annular positioning boss 244 is provided around the first through hole 245 on the housing 24. Specifically, the annular positioning boss 244 is used to position the inner side of the copper wire winding 23 on the lower iron core 22. It can be understood that the inner side of the copper wire winding 23 refers to the side of the shaft hole position close to the center position of the lower iron core 22.

[0039] In order to prevent the upper core 21 of the present invention from rotating during operation, a positioning slot 252 is provided at a position corresponding to the second stator tooth 211 on the fixing plate 25, and the positioning slot 252 is provided in cooperation with the second stator tooth 211. When the fixing plate 25 presses the stacked lower core 22 and the upper core 21, the positioning slot 252 is sleeved on the second stator tooth 211 at the corresponding position, which effectively prevents the upper core 21 from rotating circumferentially relative to the lower core 22, thereby improving the reliability of the relative position of the upper core 21 and the lower core 22. Specifically, after the fixing plate 5 is sleeved on the second stator tooth 211 at the corresponding position, it is connected to the housing 24. The fixing plate 5 and the housing 24 can be connected by bolt locking, gluing, clamping, etc., or by other detachable and fixed connection methods commonly used by those skilled in the art.

[0040] In a specific embodiment, in order to prevent the fixing plate 25 from rotating under the action of external force after being installed on the upper core 21, the fixing plate 25 is provided with a protruding positioning portion 251 at the side of the second opening 242, and the protruding positioning portion 251 is slidably connected in the second opening 242, and the width of the protruding positioning portion 251 corresponds to the width of the second opening 242, thereby preventing the fixing plate 25 from driving the upper core 21 to rotate, and ensuring the relative stacking position of the upper core 21 and the lower core 22. In order to facilitate the installation and disassembly of the fixing plate 25, the protruding positioning portion 251 is slidably connected to the side wall of the second opening 242.

[0041] Understandable, such as Figure 5 and Figure 6 As shown, when the inner cavity of the shell 24 for placing the upper iron core 21 and the lower iron core 22 is a cylindrical cavity, the edge shape of the fixing plate 25 is a circle that is matched with the inner cavity of the shell 24, wherein the raised positioning portion 251 is arranged on the side of the circular contour of the fixing plate 25.

[0042] It can be understood that in order to prevent magnetic leakage, the housing 24 and the fixing plate 25 are both made of non-magnetic conductive materials.

[0043] In order to facilitate the connection between the fixing plate 25 and the shell 24, a placement table 243 is provided on the inner side surface of the shell 24 near the first opening 241, and the placement table 243 is used to place the fixing plate 25. In order to enable the fixing plate 25 to press the upper iron core 21 and the lower iron core 22, the sum of the overall height of the lower iron core 22 and the height of the yoke of the upper iron core 21 is consistent with the table height of the placement table 243. It should be noted that the table height of the placement table 243 refers to the height of the table of the placement table 243 from the inner bottom surface of the shell 24. In a specific embodiment, the placement table 243 is an integrated annular placement surface.

[0044] In order to facilitate the connection, a threaded hole for connection can be provided on the annular placement surface, and a through hole is provided at a position corresponding to the threaded hole on the fixing plate 25, and a screw or bolt for connection passes through the through hole and is connected in the threaded hole. Of course, in other implementations, the placement platform 243 can also be a plurality of evenly spaced surfaces of the same height.

[0045] In order to reduce the occupied space of the entire structure and save costs, the height of the second stator tooth 211 is smaller than the height of the first stator tooth 221 .

[0046] In a specific embodiment, evenly distributed bolt connection holes 246 are provided on the outer side of the housing 24 to facilitate connection of the housing 24 with another housing part.

[0047] A through hole for the motor shaft to pass through is provided at the center of the upper iron core 21 and the lower iron core 22. During installation, the upper iron core 21 is installed close to the rotor of the motor.

[0048] The axial magnetic field motor stator core provided by the present invention adopts an upper and lower two-layer spliced ​​core, so that the lower core 22 realizes a closed structure, weakens the harmonics at the slot position of the first stator slot 222 when the axial motor is running, and reduces the eddy current loss of the copper wire in the first stator slot 222.

[0049] In the description of this solution, it should be understood that the terms "upper", "lower", "vertical", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this solution.

[0050] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this solution, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0051] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0052] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An axial magnetic field motor stator core, characterized in that: It comprises a lower iron core (22) and an upper iron core (21) stacked up and down, the lower iron core (22) being used to arrange a copper wire winding (23), and the upper iron core (21) being used to form a stator slot of the lower iron core (22) into a closed slot; The lower iron core (22) is provided with a first stator slot (222) and a first stator tooth (221), and the upper iron core (21) is provided with a second stator slot (212) and a second stator tooth (211); The first stator slot (222) is used to place the copper wire winding (23); the second stator teeth (211) and the first stator teeth (221) are arranged in one-to-one correspondence when they are stacked; and the tooth surface of the first stator teeth (221) is in contact with the yoke of the upper iron core (21); The axial magnetic field motor stator core further comprises a housing (24) for containing the lower core (22) and the upper core (21) and a fixing plate (25) for fixing them, wherein the fixing plate (25) is used to press against the upper core (21) placed in the housing (24); A positioning through slot (252) is provided at a position on the fixing plate (25) corresponding to the second stator tooth (211), and the positioning through slot (252) is arranged in cooperation with the second stator tooth (211); The shell (24) and the fixing plate (25) are both made of non-magnetic conductive materials.

2. The axial magnetic field motor stator core according to claim 1, characterized in that: The second stator tooth (211) and the first stator tooth (221) have the same horizontal cross-sectional shape and size.

3. The axial magnetic field motor stator core according to claim 2, characterized in that: The upper end of the shell (24) is provided with a first opening (241) for accommodating the lower iron core (22) and the upper iron core (21), and the side surface of the shell (24) is provided with a second opening (242) for leading out the copper wire of the copper wire winding (23).

4. The axial magnetic field motor stator core according to claim 3, characterized in that: A first through hole (245) is provided at the center of the bottom surface of the housing (24), and a second through hole (253) is provided at the center of the fixing plate (25); the first through hole (245) and the second through hole (253) are used for passing the motor shaft.

5. The axial magnetic field motor stator core according to claim 4, characterized in that: An annular positioning boss (244) is provided around the first through hole (245) on the housing (24).

6. The axial magnetic field motor stator core according to claim 3, characterized in that: A protruding positioning portion (251) is provided on the side of the fixing plate (25) at the position of the second opening (242); the width of the protruding positioning portion (251) corresponds to the width of the second opening (242); and the protruding positioning portion (251) is slidably connected in the second opening (242).

7. The axial magnetic field motor stator core according to claim 3, characterized in that: A placement platform (243) is provided on the inner side surface of the shell (24) near the first opening (241), and the placement platform (243) is used to place the fixing plate (25).

8. The axial magnetic field motor stator core according to claim 2, characterized in that: The height of the second stator tooth (211) is smaller than the height of the first stator tooth (221).

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