Spliced permanent magnet motor rotor structure

Abstract

The application provides a spliced permanent magnet motor rotor structure, 2p same rotor sector core units are spliced along the circumferential direction of a rotor core to form a complete rotor core, and the rotor sector core units are spliced with each other to form a magnetic steel slot along the circumferential direction of the rotor core. Compared with the current integral circular magnetic steel sheet, the rotor core modular design simplifies the processing steps and difficulty, increases the manufacturing speed of the permanent magnet motor rotor core, effectively reduces the processing cost, and is suitable for mass production in industry. When the rotor fails, only the sector core unit at the failure position needs to be replaced, and the whole rotor does not need to be replaced, thereby effectively reducing the maintenance cost in the later period.

Description

Technical Field

[0001] This invention relates to the field of motor technology, and in particular to a modular permanent magnet motor rotor structure. Background Technology

[0002] With the rapid development of new energy electric vehicle technology, both its production and sales have increased significantly. The demand for built-in permanent magnet motors in the new energy electric vehicle sector is also rising. Improving motor production efficiency and ensuring stable motor operation are future trends in motor manufacturing. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a permanent magnet motor rotor structure with a splicable rotor core, which simplifies the processing difficulty of the core while maintaining the original structural strength of the motor and improves the manufacturing speed of the permanent magnet motor rotor.

[0004] To achieve the above objectives, the present invention adopts the following technical solution.

[0005] A modular permanent magnet motor rotor structure includes a rotor core, a connecting platform, multiple magnets, and a rotating shaft;

[0006] The rotor core is composed of 2p identical sector-shaped core units spliced ​​along the circumference of the rotor core, where p is a positive integer greater than or equal to 1;

[0007] The connecting platform is fitted on the outer periphery of the rotating shaft, and the rotor core is fitted on the outer periphery of the connecting platform; there are multiple magnets, and each magnet is connected to two adjacent sector-shaped core units.

[0008] Preferably, the outer periphery of the connecting platform has a first groove arranged at intervals along its circumference, and each sector core unit has a boss on its radial side that mates with the first groove.

[0009] Preferably, each sector-shaped core unit has a second groove on both sides of its circumference; when the sector-shaped core units are spliced ​​together to form a rotor core, the second groove of the adjacent sector-shaped core units forms a magnet slot for accommodating magnets.

[0010] Preferably, the spaced positions between two adjacent first grooves on the outer periphery of the connecting platform are configured as protrusions; each protrusion has a circumferentially extending inner section magnetic isolation groove; the top of each protrusion has a T-shaped protrusion, and the two sides of the T-shaped protrusion are configured as outer section magnetic isolation grooves.

[0011] Preferably, each sector core unit has a core protrusion on the other radial side. There are two core protrusions, located on the circumferential sides of each sector core unit, so that when the sector core units are spliced ​​together to form a rotor core, the joint area of ​​two adjacent sector core units forms a core boss.

[0012] Each sector-shaped core unit also has a magnetically shielding groove adjacent to the core protrusion;

[0013] The magnets are snap-fit ​​magnets. When the sector-shaped iron core units are spliced ​​together to form the rotor iron core, the two ends of each snap-fit ​​magnet are inserted into the magnetic snap-fit ​​grooves of the two adjacent sector-shaped iron core units, so that each snap-fit ​​magnet snaps against the outer periphery of the iron core boss constructed by the two adjacent sector-shaped iron core units.

[0014] Preferably, it also includes multiple magnetic sheaths, each magnetic sheath being attached to the outer periphery of a magnet with a corresponding buckle.

[0015] Preferably, the magnetic sheath has multiple longitudinally through-holes for heat dissipation.

[0016] Preferably, it also includes a shaft platform, which is sleeved on the outer circumferential surface of the rotating shaft, and the rotor core is sleeved on the outer circumferential surface of the shaft platform.

[0017] As can be seen from the technical solutions provided by the embodiments of the present invention above, the present invention provides a spliced ​​permanent magnet motor rotor structure, which splices 2p identical rotor sector iron core units along the circumferential direction of the rotor iron core to form a complete rotor iron core. Moreover, the rotor sector iron core units can be spliced ​​together to form magnetic steel slots along the circumferential direction of the rotor iron core. Compared with the current integral circular magnetic steel sheet, this rotor structure adopts a modular design of the rotor iron core, which simplifies the processing steps and reduces the difficulty, increases the manufacturing speed of the permanent magnet motor rotor iron core, effectively reduces the processing cost, and is suitable for mass production in industry. Furthermore, when the rotor fails, only the sector iron core unit at the faulty location needs to be replaced, without replacing the entire rotor, effectively reducing the later maintenance cost.

[0018] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of the invention. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 A schematic diagram of a first embodiment of a spliced ​​permanent magnet motor rotor structure provided by the present invention;

[0021] Figure 2 A front view of the sector-shaped iron core unit of a first embodiment of a spliced ​​permanent magnet motor rotor structure provided by the present invention;

[0022] Figure 3 A front view of the core unit connecting platform of a first embodiment of a spliced ​​permanent magnet motor rotor structure provided by the present invention;

[0023] Figure 4 A schematic diagram of a second embodiment of a spliced ​​permanent magnet motor rotor structure provided by the present invention;

[0024] Figure 5 A front view of the core unit connecting platform of a second embodiment of a spliced ​​permanent magnet motor rotor structure provided by the present invention;

[0025] Figure 6 This is a schematic diagram of a third embodiment of a spliced ​​permanent magnet motor rotor structure provided by the present invention;

[0026] Figure 7 A front view of the sector-shaped iron core unit of a third embodiment of a spliced ​​permanent magnet motor rotor structure provided by the present invention;

[0027] Figure 8 This is a schematic diagram of a fourth embodiment of a spliced ​​permanent magnet motor rotor structure provided by the present invention;

[0028] Figure 9 A front view of the snap-fit ​​magnet in a fourth embodiment of a spliced ​​permanent magnet motor rotor structure provided by the present invention;

[0029] Figure 10 This is a front view of the magnet sheath of a fourth embodiment of a spliced ​​permanent magnet motor rotor structure provided by the present invention.

[0030] In the picture:

[0031] 001. Sector-shaped iron core unit; 002. Connecting platform; 003. Boss; 004. First groove; 005. Magnet groove; 006. Second groove; 007. T-shaped protrusion; 008. Inner section magnetic isolation groove; 009. Outer section magnetic isolation groove; 010. Shaft platform; 011. Rotating shaft;

[0032] 305. Core protrusion; 306. Snap-on magnet; 307. Magnet sheath; 308. Magnetic isolation groove; 309. Heat dissipation hole. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0034] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” “the,” and “the” used herein may also include the plural forms. It should be further understood that the term “comprising” as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or couplings. The term “and / or” as used herein includes any and all combinations of one or more of the associated listed items.

[0035] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless defined as herein.

[0036] To facilitate understanding of the embodiments of the present invention, the following will provide further explanation and description with reference to the accompanying drawings and several specific embodiments. These embodiments do not constitute a limitation on the embodiments of the present invention.

[0037] Example 1:

[0038] This implementation example presents a modular permanent magnet motor rotor structure, which is an internal modular permanent magnet motor rotor structure, such as... Figure 1 As shown, it includes a rotor core, which is formed by connecting 2p identical sector-shaped core units 001 along the circumference of the rotor core. For ease of production and assembly, the sector-shaped core units 001 are uniformly stamped from silicon steel sheets of the same size and shape used in motors. The 2p sector-shaped core units 001 are connected to each other by, but not limited to, welding.

[0039] The sector-shaped iron core unit 001 is connected to the connecting platform 002 of the sector-shaped iron core unit along the circumferential direction of the rotor iron core via a slot, and is connected to each other by means of, but not limited to, welding.

[0040] The connecting platform 002 of the sector-shaped iron core unit is connected to the shaft platform 103, and the rotating shaft 111 is connected to the shaft platform 110. For example... Figures 1 to 3 As shown, a boss 003 is added to the inner side of the rotor core in the diameter direction. The boss 003 can be inserted into the first groove 004 on the core unit connecting platform and connected to each other by means of, but not limited to, welding.

[0041] The sector-shaped iron core unit has symmetrical second grooves 006 on both sides. When two identical sector-shaped iron core units are connected along the circumference of the rotor iron core, the second grooves 006 of the two adjacent sector-shaped iron core units combine to form a magnet slot 005, and a magnet is installed in the magnet slot 005; where p is a positive integer greater than or equal to 1.

[0042] The sector-shaped core unit 001 is a solid magnetic conductor, or the rotor core is made of multiple stamped magnetic steel sheets with the same shape, which are stamped axially.

[0043] Example 2:

[0044] This implementation case proposes a modular permanent magnet motor rotor structure, which is a built-in modular permanent magnet motor rotor structure, such as... Figure 4 As shown, it includes a rotor core, which is formed by connecting 2p identical sector-shaped core units 001 along the circumference of the rotor core. For ease of production and assembly, the sector-shaped core units 001 are uniformly stamped from silicon steel sheets of the same size and shape used in motors. The 2p sector-shaped core units 001 are connected to each other by, but not limited to, welding.

[0045] The sector-shaped core unit 001 is connected (assembled) to the outer periphery of the connecting platform 002 via a slot along the circumferential direction of the rotor core, and is connected to each other by means of, but not limited to, welding.

[0046] The connecting platform 002 is connected to the shaft platform 010 (sleeved), and the rotating shaft 011 is connected to the shaft platform 010 (sleeved). A boss 003 is added to the inner side of the rotor core in the diameter direction. The boss 003 can be inserted into the first groove 004 on the connecting platform of the core unit and connected to each other by means of, but not limited to, welding.

[0047] The sector-shaped core unit 001 has symmetrical second grooves 006 on both sides. When two identical sector-shaped core units 001 are connected along the circumference of the rotor core, the second grooves 006 of two adjacent sector-shaped core units 001 combine to form a magnet slot 005, in which a magnet is installed; where p is a positive integer greater than or equal to 1. It should be understood that the symmetry here refers to axial symmetry about the joint between two adjacent sector-shaped core units.

[0048] like Figure 4 and 5As shown, the magnet groove 005 has an inner magnetic isolation groove 008 and an outer magnetic isolation groove 009 at the end of the magnet near the connection side between the fan-shaped core unit 001 and the core unit connecting platform 002 to reduce end magnetic leakage. Specifically, a protrusion can be constructed at the interval between two adjacent first grooves 004 on the outer periphery of the connecting platform 002 (since the grooves are recessed, this position is relatively naturally convex); each protrusion has a circumferentially extending inner magnetic isolation groove 009; the top of each protrusion has a T-shaped protrusion 007, and the two sides of the T-shaped protrusion 007 are constructed as hollow outer magnetic isolation grooves 008. The outer magnetic isolation grooves 008 and the T-shaped protrusions 007 can serve to support the magnet.

[0049] The inner section magnetic shielding groove is located in the area of ​​the two sector-shaped iron core units 001, and is composed of the T-shaped protrusion 007 of the iron core unit connecting platform 002 and the magnet. The height and width of the outer section magnetic shielding groove 008 should be less than 1 / 4 and greater than 1 / 8 of the width l0 of the magnet groove to ensure the mechanical strength of the T-shaped protrusion 007 and the magnet groove and the magnetic shielding effect of the magnetic shielding groove.

[0050] When two sector-shaped iron core units 001 are combined; after the magnet is inserted into the magnet slot 005, the T-shaped protrusion 007 plays the role of supporting the magnet; the gap between the magnet slots on the left and right of the T-shaped protrusion 007 is constructed as the outer section magnetic isolation slot 008.

[0051] The sector-shaped core unit 001 is a solid magnetic conductor, or the rotor core is made of multiple stamped magnetic steel sheets with the same shape, which are stamped axially.

[0052] Implementation Case 3:

[0053] This implementation example presents a surface-mounted permanent magnet motor rotor structure, such as... Figure 6 As shown, it includes a rotor core, which is formed by connecting 2p identical sector-shaped core units 001 along the circumference of the rotor core. For ease of production and assembly, the sector-shaped core units 001 are uniformly stamped from silicon steel sheets of the same size and shape used in motors. The 2p sector-shaped core units 001 are connected to each other by, but not limited to, welding.

[0054] The sector-shaped iron core unit 001 is connected to the sector-shaped iron core unit connecting platform 002 along the circumferential direction of the rotor iron core via a slot, and is connected to each other by means of, but not limited to, welding.

[0055] The fan-shaped core unit connecting platform 002 is interconnected with the shaft platform 010, and the rotating shaft 411 is interconnected with the shaft platform 410. A boss 003 is added to the inner side of the rotor core in the diameter direction. The boss 003 can be inserted into the first groove 002 on the core unit connecting platform and connected to each other by means of, but not limited to, welding. The groove shape can be, but is not limited to, dovetail grooves to increase rotor strength; the material of the core unit connecting platform can be, but is not limited to, the same magnetic material as the core; the material of the core unit connecting platform can also be, but is not limited to, non-magnetic materials such as stainless steel.

[0056] like Figure 7 As shown, the fan-shaped core units 001 are spliced ​​to form core protrusions 305 distributed along the circumference; snap-fit ​​magnets 306 are installed on the core protrusions 305. Their magnetization directions are four different directions: the left and right snap-fit ​​ends are magnetized tangentially to the circumference of the motor rotor with opposite directions at both ends; the top of the snap-fit ​​is magnetized radially along the motor. This magnetization method allows the snap-fit ​​magnets to magnetize inwards or outwards; and the snap-fit ​​magnets are installed on the protrusions formed by splicing two fan-shaped core units, and their special snap-fit ​​structure increases the structural strength between the fan-shaped core units 001. The snap-fit ​​ends are snapped into the magnetically shielded snap-fit ​​grooves 308, with a gap between them and the end of the magnetically shielded snap-fit ​​grooves 308 to reduce end magnetic leakage.

[0057] The sector-shaped core unit 001 is a solid magnetic conductor, or the rotor core is made of multiple stamped magnetic steel sheets with the same shape, which are stamped axially.

[0058] Implementation Case 4:

[0059] This implementation example presents a surface-mounted permanent magnet motor rotor structure, such as... Figure 8 As shown, it includes a rotor core, which is formed by connecting 2p identical sector-shaped core units 301 along the circumference of the rotor core. For ease of production and assembly, the sector-shaped core units 301 are uniformly stamped from silicon steel sheets of the same size and shape for motors. The 2p sector-shaped core units 301 are connected to each other by, but not limited to, welding.

[0060] The sector-shaped iron core unit 001 is connected to the sector-shaped iron core unit connecting platform 002 along the circumferential direction of the rotor iron core via a slot, and is connected to each other by means of, but not limited to, welding.

[0061] The fan-shaped core unit connecting platform 002 is interconnected with the shaft platform 010, and the rotating shaft 011 is interconnected with the shaft platform 010. A boss 003 is added to the inner side of the rotor core in the diameter direction. The boss 003 can be inserted into the groove 004 on the core unit connecting platform and connected to each other by means of, but not limited to, welding. The groove shape can be, but is not limited to, dovetail grooves to increase rotor strength. The material of the core unit connecting platform can be, but is not limited to, the same magnetic material as the core; the material of the core unit connecting platform can also be, but is not limited to, non-magnetic materials such as stainless steel.

[0062] The fan-shaped core units 001 are spliced ​​together to form core protrusions 005 distributed along the circumference; snap-fit ​​magnets 306 are installed on the core protrusions 005. Their magnetization directions are three different directions: the left and right snap-fit ​​ends are magnetized tangentially to the circumference of the motor rotor with opposite directions at both ends; the top of the snap-fit ​​is magnetized radially along the motor. This magnetization method allows the snap-fit ​​magnets 306 to magnetize inwards or outwards. Furthermore, the snap-fit ​​magnets 306 are installed on the core protrusions 005 formed by splicing two fan-shaped core units, and their special snap-fit ​​structure increases the structural strength between the fan-shaped core units 001. The snap-fit ​​ends are snapped into the magnetically insulating slots 308 to reduce end magnetic leakage.

[0063] like Figure 9 and 10 As shown, the function of the magnet sheath 307 is to protect the magnet and increase its magnetic conductivity. Its material can be, but is not limited to, the same magnetic conductive material as the iron core. Its structure is the same snap-fit ​​structure as the snap-fit ​​magnet, which further increases the structural strength of the fan-shaped iron core unit 301 and the magnet 306. The magnet sheath 307 has multiple heat dissipation holes 309, which can improve the heat dissipation of the magnet.

[0064] The sector-shaped core unit 001 is a solid magnetic conductor, or the rotor core is made of multiple stamped magnetic steel sheets with the same shape, which are stamped axially.

[0065] In summary, this invention provides a modular permanent magnet motor rotor structure. Two identical rotor sector-shaped core units are spliced ​​together along the circumference of the rotor core to form a complete rotor core. Furthermore, the splicing of these sector-shaped core units creates magnetic slots along the circumference of the rotor core. Compared to the current monolithic circular magnetic steel sheets, this rotor structure employs a modular rotor core design, simplifying processing steps and reducing complexity. This increases the manufacturing speed of the permanent magnet motor rotor core and effectively reduces processing costs, making it suitable for mass production in industry. Moreover, when a rotor malfunctions, only the faulty sector-shaped core unit needs to be replaced, without replacing the entire rotor, effectively reducing subsequent maintenance costs.

[0066] Those skilled in the art will understand that the accompanying drawings are merely schematic diagrams of one embodiment, and the modules or processes shown in the drawings are not necessarily essential for implementing the present invention.

[0067] As can be seen from the above description of the embodiments, those skilled in the art can clearly understand that the present invention can be implemented by means of software plus necessary general-purpose hardware platforms. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product can be stored in a storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute the methods described in various embodiments or some parts of the embodiments of the present invention.

[0068] The various embodiments in this specification are described in a progressive manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for apparatus or system embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments. The apparatus and system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0069] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A spliced ​​permanent magnet motor rotor structure, characterized in that, Includes rotor core, connecting platform, multiple magnets and shaft; The rotor core consists of 2 p It is formed by splicing together fan-shaped iron core units with the same configuration along the circumference of the rotor iron core. p It is a positive integer greater than or equal to 1; The connecting platform is fitted onto the outer periphery of the rotating shaft, and the rotor core is fitted onto the outer periphery of the connecting platform; There are multiple magnets, and each magnet is connected to two adjacent sector-shaped iron core units; The outer periphery of the connecting platform has a first groove arranged at intervals along its own circumference, and each of the fan-shaped iron core units has a boss on one radial side that mates with the first groove. Each of the sector-shaped core units has a core protrusion on the other radial side. There are two core protrusions, located on the circumferential sides of each sector-shaped core unit, so that when the sector-shaped core units are spliced ​​together to form the rotor core, the joint area of ​​two adjacent sector-shaped core units forms a core boss. Each of the said sector-shaped core units also has a magnetically shielded groove adjacent to the core protrusion; The magnet is a snap-fit ​​magnet. When the sector-shaped iron core units are spliced ​​together to form the rotor iron core, the two ends of each snap-fit ​​magnet are respectively inserted into the magnetic isolation snap-fit ​​grooves of two adjacent sector-shaped iron core units, so that each snap-fit ​​magnet snaps against the outer periphery of the iron core boss constructed by the two adjacent sector-shaped iron core units.

2. The permanent magnet motor rotor structure according to claim 1, characterized in that, It also includes multiple magnetic sheaths, each of which is attached to the outer periphery of a magnet with a corresponding snap fastener.

3. The permanent magnet motor rotor structure according to claim 2, characterized in that, The magnetic sheath has multiple longitudinally arranged heat dissipation holes.

4. The permanent magnet motor rotor structure according to any one of claims 1 to 3, characterized in that, It also includes a shaft platform, which is sleeved on the outer circumferential surface of the rotating shaft, and the rotor core is sleeved on the outer circumferential surface of the shaft platform.

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